src/rrd_graph.c

   1 /****************************************************************************
   2  * RRDtool 1.4.3  Copyright by Tobi Oetiker, 1997-2010
   3  ****************************************************************************
   4  * rrd__graph.c  produce graphs from data in rrdfiles
   5  ****************************************************************************/
   6
   7
   8 #include <sys/stat.h>
   9
  10 #ifdef WIN32
  11 #include "strftime.h"
  12 #endif
  13
  14 #include "rrd_tool.h"
  15
  16 /* for basename */
  17 #ifdef HAVE_LIBGEN_H
  18 #  include <libgen.h>
  19 #else
  20 #include "plbasename.h"
  21 #endif
  22
  23 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
  24 #include <io.h>
  25 #include <fcntl.h>
  26 #endif
  27
  28 #include <time.h>
  29
  30 #include <locale.h>
  31
  32 #ifdef HAVE_LANGINFO_H
  33 #include <langinfo.h>
  34 #endif
  35
  36 #include "rrd_graph.h"
  37 #include "rrd_client.h"
  38
  39 /* some constant definitions */
  40
  41
  42
  43 #ifndef RRD_DEFAULT_FONT
  44 /* there is special code later to pick Cour.ttf when running on windows */
  45 #define RRD_DEFAULT_FONT "DejaVu Sans Mono,Bitstream Vera Sans Mono,monospace,Courier"
  46 #endif
  47
  48 text_prop_t text_prop[] = {
  49     {8.0, RRD_DEFAULT_FONT,NULL}
  50     ,                   /* default */
  51     {9.0, RRD_DEFAULT_FONT,NULL}
  52     ,                   /* title */
  53     {7.0, RRD_DEFAULT_FONT,NULL}
  54     ,                   /* axis */
  55     {8.0, RRD_DEFAULT_FONT,NULL}
  56     ,                   /* unit */
  57     {8.0, RRD_DEFAULT_FONT,NULL} /* legend */
  58     ,
  59     {5.5, RRD_DEFAULT_FONT,NULL} /* watermark */
  60 };
  61
  62 xlab_t    xlab[] = {
  63     {0, 0, TMT_SECOND, 30, TMT_MINUTE, 5, TMT_MINUTE, 5, 0, "%H:%M"}
  64     ,
  65     {2, 0, TMT_MINUTE, 1, TMT_MINUTE, 5, TMT_MINUTE, 5, 0, "%H:%M"}
  66     ,
  67     {5, 0, TMT_MINUTE, 2, TMT_MINUTE, 10, TMT_MINUTE, 10, 0, "%H:%M"}
  68     ,
  69     {10, 0, TMT_MINUTE, 5, TMT_MINUTE, 20, TMT_MINUTE, 20, 0, "%H:%M"}
  70     ,
  71     {30, 0, TMT_MINUTE, 10, TMT_HOUR, 1, TMT_HOUR, 1, 0, "%H:%M"}
  72     ,
  73     {60, 0, TMT_MINUTE, 30, TMT_HOUR, 2, TMT_HOUR, 2, 0, "%H:%M"}
  74     ,
  75     {60, 24 * 3600, TMT_MINUTE, 30, TMT_HOUR, 2, TMT_HOUR, 6, 0, "%a %H:%M"}
  76     ,
  77     {180, 0, TMT_HOUR, 1, TMT_HOUR, 6, TMT_HOUR, 6, 0, "%H:%M"}
  78     ,
  79     {180, 24 * 3600, TMT_HOUR, 1, TMT_HOUR, 6, TMT_HOUR, 12, 0, "%a %H:%M"}
  80     ,
  81     /*{300,             0,   TMT_HOUR,3,    TMT_HOUR,12,   TMT_HOUR,12,    12*3600,"%a %p"},  this looks silly */
  82     {600, 0, TMT_HOUR, 6, TMT_DAY, 1, TMT_DAY, 1, 24 * 3600, "%a"}
  83     ,
  84     {1200, 0, TMT_HOUR, 6, TMT_DAY, 1, TMT_DAY, 1, 24 * 3600, "%d"}
  85     ,
  86     {1800, 0, TMT_HOUR, 12, TMT_DAY, 1, TMT_DAY, 2, 24 * 3600, "%a %d"}
  87     ,
  88     {2400, 0, TMT_HOUR, 12, TMT_DAY, 1, TMT_DAY, 2, 24 * 3600, "%a"}
  89     ,
  90     {3600, 0, TMT_DAY, 1, TMT_WEEK, 1, TMT_WEEK, 1, 7 * 24 * 3600, "Week %V"}
  91     ,
  92     {3 * 3600, 0, TMT_WEEK, 1, TMT_MONTH, 1, TMT_WEEK, 2, 7 * 24 * 3600,
  93      "Week %V"}
  94     ,
  95     {6 * 3600, 0, TMT_MONTH, 1, TMT_MONTH, 1, TMT_MONTH, 1, 30 * 24 * 3600,
  96      "%b"}
  97     ,
  98     {48 * 3600, 0, TMT_MONTH, 1, TMT_MONTH, 3, TMT_MONTH, 3, 30 * 24 * 3600,
  99      "%b"}
 100     ,
 101     {315360, 0, TMT_MONTH, 3, TMT_YEAR, 1, TMT_YEAR, 1, 365 * 24 * 3600, "%Y"}
 102     ,
 103     {10 * 24 * 3600, 0, TMT_YEAR, 1, TMT_YEAR, 1, TMT_YEAR, 1,
 104      365 * 24 * 3600, "%y"}
 105     ,
 106     {-1, 0, TMT_MONTH, 0, TMT_MONTH, 0, TMT_MONTH, 0, 0, ""}
 107 };
 108
 109 /* sensible y label intervals ...*/
 110
 111 ylab_t    ylab[] = {
 112     {0.1, {1, 2, 5, 10}
 113      }
 114     ,
 115     {0.2, {1, 5, 10, 20}
 116      }
 117     ,
 118     {0.5, {1, 2, 4, 10}
 119      }
 120     ,
 121     {1.0, {1, 2, 5, 10}
 122      }
 123     ,
 124     {2.0, {1, 5, 10, 20}
 125      }
 126     ,
 127     {5.0, {1, 2, 4, 10}
 128      }
 129     ,
 130     {10.0, {1, 2, 5, 10}
 131      }
 132     ,
 133     {20.0, {1, 5, 10, 20}
 134      }
 135     ,
 136     {50.0, {1, 2, 4, 10}
 137      }
 138     ,
 139     {100.0, {1, 2, 5, 10}
 140      }
 141     ,
 142     {200.0, {1, 5, 10, 20}
 143      }
 144     ,
 145     {500.0, {1, 2, 4, 10}
 146      }
 147     ,
 148     {0.0, {0, 0, 0, 0}
 149      }
 150 };
 151
 152
 153 gfx_color_t graph_col[] =   /* default colors */
 154 {
 155     {1.00, 1.00, 1.00, 1.00},   /* canvas     */
 156     {0.95, 0.95, 0.95, 1.00},   /* background */
 157     {0.81, 0.81, 0.81, 1.00},   /* shade A    */
 158     {0.62, 0.62, 0.62, 1.00},   /* shade B    */
 159     {0.56, 0.56, 0.56, 0.75},   /* grid       */
 160     {0.87, 0.31, 0.31, 0.60},   /* major grid */
 161     {0.00, 0.00, 0.00, 1.00},   /* font       */
 162     {0.50, 0.12, 0.12, 1.00},   /* arrow      */
 163     {0.12, 0.12, 0.12, 1.00},   /* axis       */
 164     {0.00, 0.00, 0.00, 1.00}    /* frame      */
 165 };
 166
 167
 168 /* #define DEBUG */
 169
 170 #ifdef DEBUG
 171 # define DPRINT(x)    (void)(printf x, printf("\n"))
 172 #else
 173 # define DPRINT(x)
 174 #endif
 175
 176
 177 /* initialize with xtr(im,0); */
 178 int xtr(
 179     image_desc_t *im,
 180     time_t mytime)
 181 {
 182     static double pixie;
 183
 184     if (mytime == 0) {
 185         pixie = (double) im->xsize / (double) (im->end - im->start);
 186         return im->xorigin;
 187     }
 188     return (int) ((double) im->xorigin + pixie * (mytime - im->start));
 189 }
 190
 191 /* translate data values into y coordinates */
 192 double ytr(
 193     image_desc_t *im,
 194     double value)
 195 {
 196     static double pixie;
 197     double    yval;
 198
 199     if (isnan(value)) {
 200         if (!im->logarithmic)
 201             pixie = (double) im->ysize / (im->maxval - im->minval);
 202         else
 203             pixie =
 204                 (double) im->ysize / (log10(im->maxval) - log10(im->minval));
 205         yval = im->yorigin;
 206     } else if (!im->logarithmic) {
 207         yval = im->yorigin - pixie * (value - im->minval);
 208     } else {
 209         if (value < im->minval) {
 210             yval = im->yorigin;
 211         } else {
 212             yval = im->yorigin - pixie * (log10(value) - log10(im->minval));
 213         }
 214     }
 215     return yval;
 216 }
 217
 218
 219
 220 /* conversion function for symbolic entry names */
 221
 222
 223 #define conv_if(VV,VVV) \
 224    if (strcmp(#VV, string) == 0) return VVV ;
 225
 226 enum gf_en gf_conv(
 227     char *string)
 228 {
 229
 230     conv_if(PRINT, GF_PRINT);
 231     conv_if(GPRINT, GF_GPRINT);
 232     conv_if(COMMENT, GF_COMMENT);
 233     conv_if(HRULE, GF_HRULE);
 234     conv_if(VRULE, GF_VRULE);
 235     conv_if(LINE, GF_LINE);
 236     conv_if(AREA, GF_AREA);
 237         conv_if(GRAD, GF_GRAD);
 238     conv_if(STACK, GF_STACK);
 239     conv_if(TICK, GF_TICK);
 240     conv_if(TEXTALIGN, GF_TEXTALIGN);
 241     conv_if(DEF, GF_DEF);
 242     conv_if(CDEF, GF_CDEF);
 243     conv_if(VDEF, GF_VDEF);
 244     conv_if(XPORT, GF_XPORT);
 245     conv_if(SHIFT, GF_SHIFT);
 246
 247     return (enum gf_en)(-1);
 248 }
 249
 250 enum gfx_if_en if_conv(
 251     char *string)
 252 {
 253
 254     conv_if(PNG, IF_PNG);
 255     conv_if(SVG, IF_SVG);
 256     conv_if(EPS, IF_EPS);
 257     conv_if(PDF, IF_PDF);
 258
 259     return (enum gfx_if_en)(-1);
 260 }
 261
 262 enum tmt_en tmt_conv(
 263     char *string)
 264 {
 265
 266     conv_if(SECOND, TMT_SECOND);
 267     conv_if(MINUTE, TMT_MINUTE);
 268     conv_if(HOUR, TMT_HOUR);
 269     conv_if(DAY, TMT_DAY);
 270     conv_if(WEEK, TMT_WEEK);
 271     conv_if(MONTH, TMT_MONTH);
 272     conv_if(YEAR, TMT_YEAR);
 273     return (enum tmt_en)(-1);
 274 }
 275
 276 enum grc_en grc_conv(
 277     char *string)
 278 {
 279
 280     conv_if(BACK, GRC_BACK);
 281     conv_if(CANVAS, GRC_CANVAS);
 282     conv_if(SHADEA, GRC_SHADEA);
 283     conv_if(SHADEB, GRC_SHADEB);
 284     conv_if(GRID, GRC_GRID);
 285     conv_if(MGRID, GRC_MGRID);
 286     conv_if(FONT, GRC_FONT);
 287     conv_if(ARROW, GRC_ARROW);
 288     conv_if(AXIS, GRC_AXIS);
 289     conv_if(FRAME, GRC_FRAME);
 290
 291     return (enum grc_en)(-1);
 292 }
 293
 294 enum text_prop_en text_prop_conv(
 295     char *string)
 296 {
 297
 298     conv_if(DEFAULT, TEXT_PROP_DEFAULT);
 299     conv_if(TITLE, TEXT_PROP_TITLE);
 300     conv_if(AXIS, TEXT_PROP_AXIS);
 301     conv_if(UNIT, TEXT_PROP_UNIT);
 302     conv_if(LEGEND, TEXT_PROP_LEGEND);
 303     conv_if(WATERMARK, TEXT_PROP_WATERMARK);
 304     return (enum text_prop_en)(-1);
 305 }
 306
 307
 308 #undef conv_if
 309
 310 int im_free(
 311     image_desc_t *im)
 312 {
 313     unsigned long i, ii;
 314     cairo_status_t status = (cairo_status_t) 0;
 315
 316     if (im == NULL)
 317         return 0;
 318
 319     if (im->daemon_addr != NULL)
 320       free(im->daemon_addr);
 321
 322     for (i = 0; i < (unsigned) im->gdes_c; i++) {
 323         if (im->gdes[i].data_first) {
 324             /* careful here, because a single pointer can occur several times */
 325             free(im->gdes[i].data);
 326             if (im->gdes[i].ds_namv) {
 327                 for (ii = 0; ii < im->gdes[i].ds_cnt; ii++)
 328                     free(im->gdes[i].ds_namv[ii]);
 329                 free(im->gdes[i].ds_namv);
 330             }
 331         }
 332         /* free allocated memory used for dashed lines */
 333         if (im->gdes[i].p_dashes != NULL)
 334             free(im->gdes[i].p_dashes);
 335
 336         free(im->gdes[i].p_data);
 337         free(im->gdes[i].rpnp);
 338     }
 339     free(im->gdes);
 340
 341     for (i = 0; i < DIM(text_prop);i++){
 342         pango_font_description_free(im->text_prop[i].font_desc);
 343         im->text_prop[i].font_desc = NULL;
 344     }
 345
 346     if (im->font_options)
 347         cairo_font_options_destroy(im->font_options);
 348
 349     if (im->cr) {
 350         status = cairo_status(im->cr);
 351         cairo_destroy(im->cr);
 352     }
 353
 354
 355     if (im->rendered_image) {
 356         free(im->rendered_image);
 357     }
 358
 359     if (im->layout) {
 360         g_object_unref (im->layout);
 361     }
 362
 363     if (im->surface)
 364         cairo_surface_destroy(im->surface);
 365
 366     if (status)
 367         fprintf(stderr, "OOPS: Cairo has issues it can't even die: %s\n",
 368                 cairo_status_to_string(status));
 369
 370     return 0;
 371 }
 372
 373 /* find SI magnitude symbol for the given number*/
 374 void auto_scale(
 375     image_desc_t *im,   /* image description */
 376     double *value,
 377     char **symb_ptr,
 378     double *magfact)
 379 {
 380
 381     char     *symbol[] = { "a", /* 10e-18 Atto */
 382         "f",            /* 10e-15 Femto */
 383         "p",            /* 10e-12 Pico */
 384         "n",            /* 10e-9  Nano */
 385         "u",            /* 10e-6  Micro */
 386         "m",            /* 10e-3  Milli */
 387         " ",            /* Base */
 388         "k",            /* 10e3   Kilo */
 389         "M",            /* 10e6   Mega */
 390         "G",            /* 10e9   Giga */
 391         "T",            /* 10e12  Tera */
 392         "P",            /* 10e15  Peta */
 393         "E"
 394     };                  /* 10e18  Exa */
 395
 396     int       symbcenter = 6;
 397     int       sindex;
 398
 399     if (*value == 0.0 || isnan(*value)) {
 400         sindex = 0;
 401         *magfact = 1.0;
 402     } else {
 403         sindex = floor(log(fabs(*value)) / log((double) im->base));
 404         *magfact = pow((double) im->base, (double) sindex);
 405         (*value) /= (*magfact);
 406     }
 407     if (sindex <= symbcenter && sindex >= -symbcenter) {
 408         (*symb_ptr) = symbol[sindex + symbcenter];
 409     } else {
 410         (*symb_ptr) = "?";
 411     }
 412 }
 413
 414
 415 static char si_symbol[] = {
 416     'a',                /* 10e-18 Atto */
 417     'f',                /* 10e-15 Femto */
 418     'p',                /* 10e-12 Pico */
 419     'n',                /* 10e-9  Nano */
 420     'u',                /* 10e-6  Micro */
 421     'm',                /* 10e-3  Milli */
 422     ' ',                /* Base */
 423     'k',                /* 10e3   Kilo */
 424     'M',                /* 10e6   Mega */
 425     'G',                /* 10e9   Giga */
 426     'T',                /* 10e12  Tera */
 427     'P',                /* 10e15  Peta */
 428     'E',                /* 10e18  Exa */
 429 };
 430 static const int si_symbcenter = 6;
 431
 432 /* find SI magnitude symbol for the numbers on the y-axis*/
 433 void si_unit(
 434     image_desc_t *im    /* image description */
 435     )
 436 {
 437
 438     double    digits, viewdigits = 0;
 439
 440     digits =
 441         floor(log(max(fabs(im->minval), fabs(im->maxval))) /
 442               log((double) im->base));
 443
 444     if (im->unitsexponent != 9999) {
 445         /* unitsexponent = 9, 6, 3, 0, -3, -6, -9, etc */
 446         viewdigits = floor((double)(im->unitsexponent / 3));
 447     } else {
 448         viewdigits = digits;
 449     }
 450
 451     im->magfact = pow((double) im->base, digits);
 452
 453 #ifdef DEBUG
 454     printf("digits %6.3f  im->magfact %6.3f\n", digits, im->magfact);
 455 #endif
 456
 457     im->viewfactor = im->magfact / pow((double) im->base, viewdigits);
 458
 459     if (((viewdigits + si_symbcenter) < sizeof(si_symbol)) &&
 460         ((viewdigits + si_symbcenter) >= 0))
 461         im->symbol = si_symbol[(int) viewdigits + si_symbcenter];
 462     else
 463         im->symbol = '?';
 464 }
 465
 466 /*  move min and max values around to become sensible */
 467
 468 void expand_range(
 469     image_desc_t *im)
 470 {
 471     double    sensiblevalues[] = { 1000.0, 900.0, 800.0, 750.0, 700.0,
 472         600.0, 500.0, 400.0, 300.0, 250.0,
 473         200.0, 125.0, 100.0, 90.0, 80.0,
 474         75.0, 70.0, 60.0, 50.0, 40.0, 30.0,
 475         25.0, 20.0, 10.0, 9.0, 8.0,
 476         7.0, 6.0, 5.0, 4.0, 3.5, 3.0,
 477         2.5, 2.0, 1.8, 1.5, 1.2, 1.0,
 478         0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.0, -1
 479     };
 480
 481     double    scaled_min, scaled_max;
 482     double    adj;
 483     int       i;
 484
 485
 486
 487 #ifdef DEBUG
 488     printf("Min: %6.2f Max: %6.2f MagFactor: %6.2f\n",
 489            im->minval, im->maxval, im->magfact);
 490 #endif
 491
 492     if (isnan(im->ygridstep)) {
 493         if (im->extra_flags & ALTAUTOSCALE) {
 494             /* measure the amplitude of the function. Make sure that
 495                graph boundaries are slightly higher then max/min vals
 496                so we can see amplitude on the graph */
 497             double    delt, fact;
 498
 499             delt = im->maxval - im->minval;
 500             adj = delt * 0.1;
 501             fact = 2.0 * pow(10.0,
 502                              floor(log10
 503                                    (max(fabs(im->minval), fabs(im->maxval)) /
 504                                     im->magfact)) - 2);
 505             if (delt < fact) {
 506                 adj = (fact - delt) * 0.55;
 507 #ifdef DEBUG
 508                 printf
 509                     ("Min: %6.2f Max: %6.2f delt: %6.2f fact: %6.2f adj: %6.2f\n",
 510                      im->minval, im->maxval, delt, fact, adj);
 511 #endif
 512             }
 513             im->minval -= adj;
 514             im->maxval += adj;
 515         } else if (im->extra_flags & ALTAUTOSCALE_MIN) {
 516             /* measure the amplitude of the function. Make sure that
 517                graph boundaries are slightly lower than min vals
 518                so we can see amplitude on the graph */
 519             adj = (im->maxval - im->minval) * 0.1;
 520             im->minval -= adj;
 521         } else if (im->extra_flags & ALTAUTOSCALE_MAX) {
 522             /* measure the amplitude of the function. Make sure that
 523                graph boundaries are slightly higher than max vals
 524                so we can see amplitude on the graph */
 525             adj = (im->maxval - im->minval) * 0.1;
 526             im->maxval += adj;
 527         } else {
 528             scaled_min = im->minval / im->magfact;
 529             scaled_max = im->maxval / im->magfact;
 530
 531             for (i = 1; sensiblevalues[i] > 0; i++) {
 532                 if (sensiblevalues[i - 1] >= scaled_min &&
 533                     sensiblevalues[i] <= scaled_min)
 534                     im->minval = sensiblevalues[i] * (im->magfact);
 535
 536                 if (-sensiblevalues[i - 1] <= scaled_min &&
 537                     -sensiblevalues[i] >= scaled_min)
 538                     im->minval = -sensiblevalues[i - 1] * (im->magfact);
 539
 540                 if (sensiblevalues[i - 1] >= scaled_max &&
 541                     sensiblevalues[i] <= scaled_max)
 542                     im->maxval = sensiblevalues[i - 1] * (im->magfact);
 543
 544                 if (-sensiblevalues[i - 1] <= scaled_max &&
 545                     -sensiblevalues[i] >= scaled_max)
 546                     im->maxval = -sensiblevalues[i] * (im->magfact);
 547             }
 548         }
 549     } else {
 550         /* adjust min and max to the grid definition if there is one */
 551         im->minval = (double) im->ylabfact * im->ygridstep *
 552             floor(im->minval / ((double) im->ylabfact * im->ygridstep));
 553         im->maxval = (double) im->ylabfact * im->ygridstep *
 554             ceil(im->maxval / ((double) im->ylabfact * im->ygridstep));
 555     }
 556
 557 #ifdef DEBUG
 558     fprintf(stderr, "SCALED Min: %6.2f Max: %6.2f Factor: %6.2f\n",
 559             im->minval, im->maxval, im->magfact);
 560 #endif
 561 }
 562
 563
 564 void apply_gridfit(
 565     image_desc_t *im)
 566 {
 567     if (isnan(im->minval) || isnan(im->maxval))
 568         return;
 569     ytr(im, DNAN);
 570     if (im->logarithmic) {
 571         double    ya, yb, ypix, ypixfrac;
 572         double    log10_range = log10(im->maxval) - log10(im->minval);
 573
 574         ya = pow((double) 10, floor(log10(im->minval)));
 575         while (ya < im->minval)
 576             ya *= 10;
 577         if (ya > im->maxval)
 578             return;     /* don't have y=10^x gridline */
 579         yb = ya * 10;
 580         if (yb <= im->maxval) {
 581             /* we have at least 2 y=10^x gridlines.
 582                Make sure distance between them in pixels
 583                are an integer by expanding im->maxval */
 584             double    y_pixel_delta = ytr(im, ya) - ytr(im, yb);
 585             double    factor = y_pixel_delta / floor(y_pixel_delta);
 586             double    new_log10_range = factor * log10_range;
 587             double    new_ymax_log10 = log10(im->minval) + new_log10_range;
 588
 589             im->maxval = pow(10, new_ymax_log10);
 590             ytr(im, DNAN);  /* reset precalc */
 591             log10_range = log10(im->maxval) - log10(im->minval);
 592         }
 593         /* make sure first y=10^x gridline is located on
 594            integer pixel position by moving scale slightly
 595            downwards (sub-pixel movement) */
 596         ypix = ytr(im, ya) + im->ysize; /* add im->ysize so it always is positive */
 597         ypixfrac = ypix - floor(ypix);
 598         if (ypixfrac > 0 && ypixfrac < 1) {
 599             double    yfrac = ypixfrac / im->ysize;
 600
 601             im->minval = pow(10, log10(im->minval) - yfrac * log10_range);
 602             im->maxval = pow(10, log10(im->maxval) - yfrac * log10_range);
 603             ytr(im, DNAN);  /* reset precalc */
 604         }
 605     } else {
 606         /* Make sure we have an integer pixel distance between
 607            each minor gridline */
 608         double    ypos1 = ytr(im, im->minval);
 609         double    ypos2 = ytr(im, im->minval + im->ygrid_scale.gridstep);
 610         double    y_pixel_delta = ypos1 - ypos2;
 611         double    factor = y_pixel_delta / floor(y_pixel_delta);
 612         double    new_range = factor * (im->maxval - im->minval);
 613         double    gridstep = im->ygrid_scale.gridstep;
 614         double    minor_y, minor_y_px, minor_y_px_frac;
 615
 616         if (im->maxval > 0.0)
 617             im->maxval = im->minval + new_range;
 618         else
 619             im->minval = im->maxval - new_range;
 620         ytr(im, DNAN);  /* reset precalc */
 621         /* make sure first minor gridline is on integer pixel y coord */
 622         minor_y = gridstep * floor(im->minval / gridstep);
 623         while (minor_y < im->minval)
 624             minor_y += gridstep;
 625         minor_y_px = ytr(im, minor_y) + im->ysize;  /* ensure > 0 by adding ysize */
 626         minor_y_px_frac = minor_y_px - floor(minor_y_px);
 627         if (minor_y_px_frac > 0 && minor_y_px_frac < 1) {
 628             double    yfrac = minor_y_px_frac / im->ysize;
 629             double    range = im->maxval - im->minval;
 630
 631             im->minval = im->minval - yfrac * range;
 632             im->maxval = im->maxval - yfrac * range;
 633             ytr(im, DNAN);  /* reset precalc */
 634         }
 635         calc_horizontal_grid(im);   /* recalc with changed im->maxval */
 636     }
 637 }
 638
 639 /* reduce data reimplementation by Alex */
 640
 641 void reduce_data(
 642     enum cf_en cf,      /* which consolidation function ? */
 643     unsigned long cur_step, /* step the data currently is in */
 644     time_t *start,      /* start, end and step as requested ... */
 645     time_t *end,        /* ... by the application will be   ... */
 646     unsigned long *step,    /* ... adjusted to represent reality    */
 647     unsigned long *ds_cnt,  /* number of data sources in file */
 648     rrd_value_t **data)
 649 {                       /* two dimensional array containing the data */
 650     int       i, reduce_factor = ceil((double) (*step) / (double) cur_step);
 651     unsigned long col, dst_row, row_cnt, start_offset, end_offset, skiprows =
 652         0;
 653     rrd_value_t *srcptr, *dstptr;
 654
 655     (*step) = cur_step * reduce_factor; /* set new step size for reduced data */
 656     dstptr = *data;
 657     srcptr = *data;
 658     row_cnt = ((*end) - (*start)) / cur_step;
 659
 660 #ifdef DEBUG
 661 #define DEBUG_REDUCE
 662 #endif
 663 #ifdef DEBUG_REDUCE
 664     printf("Reducing %lu rows with factor %i time %lu to %lu, step %lu\n",
 665            row_cnt, reduce_factor, *start, *end, cur_step);
 666     for (col = 0; col < row_cnt; col++) {
 667         printf("time %10lu: ", *start + (col + 1) * cur_step);
 668         for (i = 0; i < *ds_cnt; i++)
 669             printf(" %8.2e", srcptr[*ds_cnt * col + i]);
 670         printf("\n");
 671     }
 672 #endif
 673
 674     /* We have to combine [reduce_factor] rows of the source
 675      ** into one row for the destination.  Doing this we also
 676      ** need to take care to combine the correct rows.  First
 677      ** alter the start and end time so that they are multiples
 678      ** of the new step time.  We cannot reduce the amount of
 679      ** time so we have to move the end towards the future and
 680      ** the start towards the past.
 681      */
 682     end_offset = (*end) % (*step);
 683     start_offset = (*start) % (*step);
 684
 685     /* If there is a start offset (which cannot be more than
 686      ** one destination row), skip the appropriate number of
 687      ** source rows and one destination row.  The appropriate
 688      ** number is what we do know (start_offset/cur_step) of
 689      ** the new interval (*step/cur_step aka reduce_factor).
 690      */
 691 #ifdef DEBUG_REDUCE
 692     printf("start_offset: %lu  end_offset: %lu\n", start_offset, end_offset);
 693     printf("row_cnt before:  %lu\n", row_cnt);
 694 #endif
 695     if (start_offset) {
 696         (*start) = (*start) - start_offset;
 697         skiprows = reduce_factor - start_offset / cur_step;
 698         srcptr += skiprows * *ds_cnt;
 699         for (col = 0; col < (*ds_cnt); col++)
 700             *dstptr++ = DNAN;
 701         row_cnt -= skiprows;
 702     }
 703 #ifdef DEBUG_REDUCE
 704     printf("row_cnt between: %lu\n", row_cnt);
 705 #endif
 706
 707     /* At the end we have some rows that are not going to be
 708      ** used, the amount is end_offset/cur_step
 709      */
 710     if (end_offset) {
 711         (*end) = (*end) - end_offset + (*step);
 712         skiprows = end_offset / cur_step;
 713         row_cnt -= skiprows;
 714     }
 715 #ifdef DEBUG_REDUCE
 716     printf("row_cnt after:   %lu\n", row_cnt);
 717 #endif
 718
 719 /* Sanity check: row_cnt should be multiple of reduce_factor */
 720 /* if this gets triggered, something is REALLY WRONG ... we die immediately */
 721
 722     if (row_cnt % reduce_factor) {
 723         printf("SANITY CHECK: %lu rows cannot be reduced by %i \n",
 724                row_cnt, reduce_factor);
 725         printf("BUG in reduce_data()\n");
 726         exit(1);
 727     }
 728
 729     /* Now combine reduce_factor intervals at a time
 730      ** into one interval for the destination.
 731      */
 732
 733     for (dst_row = 0; (long int) row_cnt >= reduce_factor; dst_row++) {
 734         for (col = 0; col < (*ds_cnt); col++) {
 735             rrd_value_t newval = DNAN;
 736             unsigned long validval = 0;
 737
 738             for (i = 0; i < reduce_factor; i++) {
 739                 if (isnan(srcptr[i * (*ds_cnt) + col])) {
 740                     continue;
 741                 }
 742                 validval++;
 743                 if (isnan(newval))
 744                     newval = srcptr[i * (*ds_cnt) + col];
 745                 else {
 746                     switch (cf) {
 747                     case CF_HWPREDICT:
 748                     case CF_MHWPREDICT:
 749                     case CF_DEVSEASONAL:
 750                     case CF_DEVPREDICT:
 751                     case CF_SEASONAL:
 752                     case CF_AVERAGE:
 753                         newval += srcptr[i * (*ds_cnt) + col];
 754                         break;
 755                     case CF_MINIMUM:
 756                         newval = min(newval, srcptr[i * (*ds_cnt) + col]);
 757                         break;
 758                     case CF_FAILURES:
 759                         /* an interval contains a failure if any subintervals contained a failure */
 760                     case CF_MAXIMUM:
 761                         newval = max(newval, srcptr[i * (*ds_cnt) + col]);
 762                         break;
 763                     case CF_LAST:
 764                         newval = srcptr[i * (*ds_cnt) + col];
 765                         break;
 766                     }
 767                 }
 768             }
 769             if (validval == 0) {
 770                 newval = DNAN;
 771             } else {
 772                 switch (cf) {
 773                 case CF_HWPREDICT:
 774                 case CF_MHWPREDICT:
 775                 case CF_DEVSEASONAL:
 776                 case CF_DEVPREDICT:
 777                 case CF_SEASONAL:
 778                 case CF_AVERAGE:
 779                     newval /= validval;
 780                     break;
 781                 case CF_MINIMUM:
 782                 case CF_FAILURES:
 783                 case CF_MAXIMUM:
 784                 case CF_LAST:
 785                     break;
 786                 }
 787             }
 788             *dstptr++ = newval;
 789         }
 790         srcptr += (*ds_cnt) * reduce_factor;
 791         row_cnt -= reduce_factor;
 792     }
 793     /* If we had to alter the endtime, we didn't have enough
 794      ** source rows to fill the last row. Fill it with NaN.
 795      */
 796     if (end_offset)
 797         for (col = 0; col < (*ds_cnt); col++)
 798             *dstptr++ = DNAN;
 799 #ifdef DEBUG_REDUCE
 800     row_cnt = ((*end) - (*start)) / *step;
 801     srcptr = *data;
 802     printf("Done reducing. Currently %lu rows, time %lu to %lu, step %lu\n",
 803            row_cnt, *start, *end, *step);
 804     for (col = 0; col < row_cnt; col++) {
 805         printf("time %10lu: ", *start + (col + 1) * (*step));
 806         for (i = 0; i < *ds_cnt; i++)
 807             printf(" %8.2e", srcptr[*ds_cnt * col + i]);
 808         printf("\n");
 809     }
 810 #endif
 811 }
 812
 813
 814 /* get the data required for the graphs from the
 815    relevant rrds ... */
 816
 817 int data_fetch(
 818     image_desc_t *im)
 819 {
 820     int       i, ii;
 821     int       skip;
 822
 823     /* pull the data from the rrd files ... */
 824     for (i = 0; i < (int) im->gdes_c; i++) {
 825         /* only GF_DEF elements fetch data */
 826         if (im->gdes[i].gf != GF_DEF)
 827             continue;
 828
 829         skip = 0;
 830         /* do we have it already ? */
 831         for (ii = 0; ii < i; ii++) {
 832             if (im->gdes[ii].gf != GF_DEF)
 833                 continue;
 834             if ((strcmp(im->gdes[i].rrd, im->gdes[ii].rrd) == 0)
 835                 && (im->gdes[i].cf == im->gdes[ii].cf)
 836                 && (im->gdes[i].cf_reduce == im->gdes[ii].cf_reduce)
 837                 && (im->gdes[i].start_orig == im->gdes[ii].start_orig)
 838                 && (im->gdes[i].end_orig == im->gdes[ii].end_orig)
 839                 && (im->gdes[i].step_orig == im->gdes[ii].step_orig)) {
 840                 /* OK, the data is already there.
 841                  ** Just copy the header portion
 842                  */
 843                 im->gdes[i].start = im->gdes[ii].start;
 844                 im->gdes[i].end = im->gdes[ii].end;
 845                 im->gdes[i].step = im->gdes[ii].step;
 846                 im->gdes[i].ds_cnt = im->gdes[ii].ds_cnt;
 847                 im->gdes[i].ds_namv = im->gdes[ii].ds_namv;
 848                 im->gdes[i].data = im->gdes[ii].data;
 849                 im->gdes[i].data_first = 0;
 850                 skip = 1;
 851             }
 852             if (skip)
 853                 break;
 854         }
 855         if (!skip) {
 856             unsigned long ft_step = im->gdes[i].step;   /* ft_step will record what we got from fetch */
 857             const char *rrd_daemon;
 858             int status;
 859
 860             if (im->gdes[i].daemon[0] != 0)
 861                 rrd_daemon = im->gdes[i].daemon;
 862             else
 863                 rrd_daemon = im->daemon_addr;
 864
 865             /* "daemon" may be NULL. ENV_RRDCACHED_ADDRESS is evaluated in that
 866              * case. If "daemon" holds the same value as in the previous
 867              * iteration, no actual new connection is established - the
 868              * existing connection is re-used. */
 869             rrdc_connect (rrd_daemon);
 870
 871             /* If connecting was successfull, use the daemon to query the data.
 872              * If there is no connection, for example because no daemon address
 873              * was specified, (try to) use the local file directly. */
 874             if (rrdc_is_connected (rrd_daemon))
 875             {
 876                 status = rrdc_fetch (im->gdes[i].rrd,
 877                         cf_to_string (im->gdes[i].cf),
 878                         &im->gdes[i].start,
 879                         &im->gdes[i].end,
 880                         &ft_step,
 881                         &im->gdes[i].ds_cnt,
 882                         &im->gdes[i].ds_namv,
 883                         &im->gdes[i].data);
 884                 if (status != 0)
 885                     return (status);
 886             }
 887             else
 888             {
 889                 if ((rrd_fetch_fn(im->gdes[i].rrd,
 890                                 im->gdes[i].cf,
 891                                 &im->gdes[i].start,
 892                                 &im->gdes[i].end,
 893                                 &ft_step,
 894                                 &im->gdes[i].ds_cnt,
 895                                 &im->gdes[i].ds_namv,
 896                                 &im->gdes[i].data)) == -1) {
 897                     return -1;
 898                 }
 899             }
 900             im->gdes[i].data_first = 1;
 901
 902             if (ft_step < im->gdes[i].step) {
 903                 reduce_data(im->gdes[i].cf_reduce,
 904                             ft_step,
 905                             &im->gdes[i].start,
 906                             &im->gdes[i].end,
 907                             &im->gdes[i].step,
 908                             &im->gdes[i].ds_cnt, &im->gdes[i].data);
 909             } else {
 910                 im->gdes[i].step = ft_step;
 911             }
 912         }
 913
 914         /* lets see if the required data source is really there */
 915         for (ii = 0; ii < (int) im->gdes[i].ds_cnt; ii++) {
 916             if (strcmp(im->gdes[i].ds_namv[ii], im->gdes[i].ds_nam) == 0) {
 917                 im->gdes[i].ds = ii;
 918             }
 919         }
 920         if (im->gdes[i].ds == -1) {
 921             rrd_set_error("No DS called '%s' in '%s'",
 922                           im->gdes[i].ds_nam, im->gdes[i].rrd);
 923             return -1;
 924         }
 925
 926     }
 927     return 0;
 928 }
 929
 930 /* evaluate the expressions in the CDEF functions */
 931
 932 /*************************************************************
 933  * CDEF stuff
 934  *************************************************************/
 935
 936 long find_var_wrapper(
 937     void *arg1,
 938     char *key)
 939 {
 940     return find_var((image_desc_t *) arg1, key);
 941 }
 942
 943 /* find gdes containing var*/
 944 long find_var(
 945     image_desc_t *im,
 946     char *key)
 947 {
 948     long      ii;
 949
 950     for (ii = 0; ii < im->gdes_c - 1; ii++) {
 951         if ((im->gdes[ii].gf == GF_DEF
 952              || im->gdes[ii].gf == GF_VDEF || im->gdes[ii].gf == GF_CDEF)
 953             && (strcmp(im->gdes[ii].vname, key) == 0)) {
 954             return ii;
 955         }
 956     }
 957     return -1;
 958 }
 959
 960 /* find the greatest common divisor for all the numbers
 961    in the 0 terminated num array */
 962 long lcd(
 963     long *num)
 964 {
 965     long      rest;
 966     int       i;
 967
 968     for (i = 0; num[i + 1] != 0; i++) {
 969         do {
 970             rest = num[i] % num[i + 1];
 971             num[i] = num[i + 1];
 972             num[i + 1] = rest;
 973         } while (rest != 0);
 974         num[i + 1] = num[i];
 975     }
 976 /*    return i==0?num[i]:num[i-1]; */
 977     return num[i];
 978 }
 979
 980 /* run the rpn calculator on all the VDEF and CDEF arguments */
 981 int data_calc(
 982     image_desc_t *im)
 983 {
 984
 985     int       gdi;
 986     int       dataidx;
 987     long     *steparray, rpi;
 988     int       stepcnt;
 989     time_t    now;
 990     rpnstack_t rpnstack;
 991
 992     rpnstack_init(&rpnstack);
 993
 994     for (gdi = 0; gdi < im->gdes_c; gdi++) {
 995         /* Look for GF_VDEF and GF_CDEF in the same loop,
 996          * so CDEFs can use VDEFs and vice versa
 997          */
 998         switch (im->gdes[gdi].gf) {
 999         case GF_XPORT:
1000             break;
1001         case GF_SHIFT:{
1002             graph_desc_t *vdp = &im->gdes[im->gdes[gdi].vidx];
1003
1004             /* remove current shift */
1005             vdp->start -= vdp->shift;
1006             vdp->end -= vdp->shift;
1007
1008             /* vdef */
1009             if (im->gdes[gdi].shidx >= 0)
1010                 vdp->shift = im->gdes[im->gdes[gdi].shidx].vf.val;
1011             /* constant */
1012             else
1013                 vdp->shift = im->gdes[gdi].shval;
1014
1015             /* normalize shift to multiple of consolidated step */
1016             vdp->shift = (vdp->shift / (long) vdp->step) * (long) vdp->step;
1017
1018             /* apply shift */
1019             vdp->start += vdp->shift;
1020             vdp->end += vdp->shift;
1021             break;
1022         }
1023         case GF_VDEF:
1024             /* A VDEF has no DS.  This also signals other parts
1025              * of rrdtool that this is a VDEF value, not a CDEF.
1026              */
1027             im->gdes[gdi].ds_cnt = 0;
1028             if (vdef_calc(im, gdi)) {
1029                 rrd_set_error("Error processing VDEF '%s'",
1030                               im->gdes[gdi].vname);
1031                 rpnstack_free(&rpnstack);
1032                 return -1;
1033             }
1034             break;
1035         case GF_CDEF:
1036             im->gdes[gdi].ds_cnt = 1;
1037             im->gdes[gdi].ds = 0;
1038             im->gdes[gdi].data_first = 1;
1039             im->gdes[gdi].start = 0;
1040             im->gdes[gdi].end = 0;
1041             steparray = NULL;
1042             stepcnt = 0;
1043             dataidx = -1;
1044
1045             /* Find the variables in the expression.
1046              * - VDEF variables are substituted by their values
1047              *   and the opcode is changed into OP_NUMBER.
1048              * - CDEF variables are analized for their step size,
1049              *   the lowest common denominator of all the step
1050              *   sizes of the data sources involved is calculated
1051              *   and the resulting number is the step size for the
1052              *   resulting data source.
1053              */
1054             for (rpi = 0; im->gdes[gdi].rpnp[rpi].op != OP_END; rpi++) {
1055                 if (im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
1056                     im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER) {
1057                     long      ptr = im->gdes[gdi].rpnp[rpi].ptr;
1058
1059                     if (im->gdes[ptr].ds_cnt == 0) {    /* this is a VDEF data source */
1060 #if 0
1061                         printf
1062                             ("DEBUG: inside CDEF '%s' processing VDEF '%s'\n",
1063                              im->gdes[gdi].vname, im->gdes[ptr].vname);
1064                         printf("DEBUG: value from vdef is %f\n",
1065                                im->gdes[ptr].vf.val);
1066 #endif
1067                         im->gdes[gdi].rpnp[rpi].val = im->gdes[ptr].vf.val;
1068                         im->gdes[gdi].rpnp[rpi].op = OP_NUMBER;
1069                     } else {    /* normal variables and PREF(variables) */
1070
1071                         /* add one entry to the array that keeps track of the step sizes of the
1072                          * data sources going into the CDEF. */
1073                         if ((steparray =
1074                              (long*)rrd_realloc(steparray,
1075                                          (++stepcnt +
1076                                           1) * sizeof(*steparray))) == NULL) {
1077                             rrd_set_error("realloc steparray");
1078                             rpnstack_free(&rpnstack);
1079                             return -1;
1080                         };
1081
1082                         steparray[stepcnt - 1] = im->gdes[ptr].step;
1083
1084                         /* adjust start and end of cdef (gdi) so
1085                          * that it runs from the latest start point
1086                          * to the earliest endpoint of any of the
1087                          * rras involved (ptr)
1088                          */
1089
1090                         if (im->gdes[gdi].start < im->gdes[ptr].start)
1091                             im->gdes[gdi].start = im->gdes[ptr].start;
1092
1093                         if (im->gdes[gdi].end == 0 ||
1094                             im->gdes[gdi].end > im->gdes[ptr].end)
1095                             im->gdes[gdi].end = im->gdes[ptr].end;
1096
1097                         /* store pointer to the first element of
1098                          * the rra providing data for variable,
1099                          * further save step size and data source
1100                          * count of this rra
1101                          */
1102                         im->gdes[gdi].rpnp[rpi].data =
1103                             im->gdes[ptr].data + im->gdes[ptr].ds;
1104                         im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
1105                         im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
1106
1107                         /* backoff the *.data ptr; this is done so
1108                          * rpncalc() function doesn't have to treat
1109                          * the first case differently
1110                          */
1111                     }   /* if ds_cnt != 0 */
1112                 }       /* if OP_VARIABLE */
1113             }           /* loop through all rpi */
1114
1115             /* move the data pointers to the correct period */
1116             for (rpi = 0; im->gdes[gdi].rpnp[rpi].op != OP_END; rpi++) {
1117                 if (im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
1118                     im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER) {
1119                     long      ptr = im->gdes[gdi].rpnp[rpi].ptr;
1120                     long      diff =
1121                         im->gdes[gdi].start - im->gdes[ptr].start;
1122
1123                     if (diff > 0)
1124                         im->gdes[gdi].rpnp[rpi].data +=
1125                             (diff / im->gdes[ptr].step) *
1126                             im->gdes[ptr].ds_cnt;
1127                 }
1128             }
1129
1130             if (steparray == NULL) {
1131                 rrd_set_error("rpn expressions without DEF"
1132                               " or CDEF variables are not supported");
1133                 rpnstack_free(&rpnstack);
1134                 return -1;
1135             }
1136             steparray[stepcnt] = 0;
1137             /* Now find the resulting step.  All steps in all
1138              * used RRAs have to be visited
1139              */
1140             im->gdes[gdi].step = lcd(steparray);
1141             free(steparray);
1142             if ((im->gdes[gdi].data = (rrd_value_t*)malloc(((im->gdes[gdi].end -
1143                                                im->gdes[gdi].start)
1144                                               / im->gdes[gdi].step)
1145                                              * sizeof(double))) == NULL) {
1146                 rrd_set_error("malloc im->gdes[gdi].data");
1147                 rpnstack_free(&rpnstack);
1148                 return -1;
1149             }
1150
1151             /* Step through the new cdef results array and
1152              * calculate the values
1153              */
1154             for (now = im->gdes[gdi].start + im->gdes[gdi].step;
1155                  now <= im->gdes[gdi].end; now += im->gdes[gdi].step) {
1156                 rpnp_t   *rpnp = im->gdes[gdi].rpnp;
1157
1158                 /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
1159                  * in this case we are advancing by timesteps;
1160                  * we use the fact that time_t is a synonym for long
1161                  */
1162                 if (rpn_calc(rpnp, &rpnstack, (long) now,
1163                              im->gdes[gdi].data, ++dataidx) == -1) {
1164                     /* rpn_calc sets the error string */
1165                     rpnstack_free(&rpnstack);
1166                     return -1;
1167                 }
1168             }           /* enumerate over time steps within a CDEF */
1169             break;
1170         default:
1171             continue;
1172         }
1173     }                   /* enumerate over CDEFs */
1174     rpnstack_free(&rpnstack);
1175     return 0;
1176 }
1177
1178 /* from http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm */
1179 /* yes we are loosing precision by doing tos with floats instead of doubles
1180    but it seems more stable this way. */
1181
1182 static int AlmostEqual2sComplement(
1183     float A,
1184     float B,
1185     int maxUlps)
1186 {
1187
1188     int       aInt = *(int *) &A;
1189     int       bInt = *(int *) &B;
1190     int       intDiff;
1191
1192     /* Make sure maxUlps is non-negative and small enough that the
1193        default NAN won't compare as equal to anything.  */
1194
1195     /* assert(maxUlps > 0 && maxUlps < 4 * 1024 * 1024); */
1196
1197     /* Make aInt lexicographically ordered as a twos-complement int */
1198
1199     if (aInt < 0)
1200         aInt = 0x80000000l - aInt;
1201
1202     /* Make bInt lexicographically ordered as a twos-complement int */
1203
1204     if (bInt < 0)
1205         bInt = 0x80000000l - bInt;
1206
1207     intDiff = abs(aInt - bInt);
1208
1209     if (intDiff <= maxUlps)
1210         return 1;
1211
1212     return 0;
1213 }
1214
1215 /* massage data so, that we get one value for each x coordinate in the graph */
1216 int data_proc(
1217     image_desc_t *im)
1218 {
1219     long      i, ii;
1220     double    pixstep = (double) (im->end - im->start)
1221         / (double) im->xsize;   /* how much time
1222                                    passes in one pixel */
1223     double    paintval;
1224     double    minval = DNAN, maxval = DNAN;
1225
1226     unsigned long gr_time;
1227
1228     /* memory for the processed data */
1229     for (i = 0; i < im->gdes_c; i++) {
1230         if ((im->gdes[i].gf == GF_LINE)
1231          || (im->gdes[i].gf == GF_AREA)
1232          || (im->gdes[i].gf == GF_TICK)
1233          || (im->gdes[i].gf == GF_GRAD)
1234         ) {
1235             if ((im->gdes[i].p_data = (rrd_value_t*)malloc((im->xsize + 1)
1236                                              * sizeof(rrd_value_t))) == NULL) {
1237                 rrd_set_error("malloc data_proc");
1238                 return -1;
1239             }
1240         }
1241     }
1242
1243     for (i = 0; i < im->xsize; i++) {   /* for each pixel */
1244         long      vidx;
1245
1246         gr_time = im->start + pixstep * i;  /* time of the current step */
1247         paintval = 0.0;
1248
1249         for (ii = 0; ii < im->gdes_c; ii++) {
1250             double    value;
1251
1252             switch (im->gdes[ii].gf) {
1253             case GF_LINE:
1254             case GF_AREA:
1255                         case GF_GRAD:
1256             case GF_TICK:
1257                 if (!im->gdes[ii].stack)
1258                     paintval = 0.0;
1259                 value = im->gdes[ii].yrule;
1260                 if (isnan(value) || (im->gdes[ii].gf == GF_TICK)) {
1261                     /* The time of the data doesn't necessarily match
1262                      ** the time of the graph. Beware.
1263                      */
1264                     vidx = im->gdes[ii].vidx;
1265                     if (im->gdes[vidx].gf == GF_VDEF) {
1266                         value = im->gdes[vidx].vf.val;
1267                     } else
1268                         if (((long int) gr_time >=
1269                              (long int) im->gdes[vidx].start)
1270                             && ((long int) gr_time <
1271                                 (long int) im->gdes[vidx].end)) {
1272                         value = im->gdes[vidx].data[(unsigned long)
1273                                                     floor((double)
1274                                                           (gr_time -
1275                                                            im->gdes[vidx].
1276                                                            start)
1277                                                           /
1278                                                           im->gdes[vidx].step)
1279                                                     * im->gdes[vidx].ds_cnt +
1280                                                     im->gdes[vidx].ds];
1281                     } else {
1282                         value = DNAN;
1283                     }
1284                 };
1285
1286                 if (!isnan(value)) {
1287                     paintval += value;
1288                     im->gdes[ii].p_data[i] = paintval;
1289                     /* GF_TICK: the data values are not
1290                      ** relevant for min and max
1291                      */
1292                     if (finite(paintval) && im->gdes[ii].gf != GF_TICK) {
1293                         if ((isnan(minval) || paintval < minval) &&
1294                             !(im->logarithmic && paintval <= 0.0))
1295                             minval = paintval;
1296                         if (isnan(maxval) || paintval > maxval)
1297                             maxval = paintval;
1298                     }
1299                 } else {
1300                     im->gdes[ii].p_data[i] = DNAN;
1301                 }
1302                 break;
1303             case GF_STACK:
1304                 rrd_set_error
1305                     ("STACK should already be turned into LINE or AREA here");
1306                 return -1;
1307                 break;
1308             default:
1309                 break;
1310             }
1311         }
1312     }
1313
1314     /* if min or max have not been asigned a value this is because
1315        there was no data in the graph ... this is not good ...
1316        lets set these to dummy values then ... */
1317
1318     if (im->logarithmic) {
1319         if (isnan(minval) || isnan(maxval) || maxval <= 0) {
1320             minval = 0.0;   /* catching this right away below */
1321             maxval = 5.1;
1322         }
1323         /* in logarithm mode, where minval is smaller or equal
1324            to 0 make the beast just way smaller than maxval */
1325         if (minval <= 0) {
1326             minval = maxval / 10e8;
1327         }
1328     } else {
1329         if (isnan(minval) || isnan(maxval)) {
1330             minval = 0.0;
1331             maxval = 1.0;
1332         }
1333     }
1334
1335     /* adjust min and max values given by the user */
1336     /* for logscale we add something on top */
1337     if (isnan(im->minval)
1338         || ((!im->rigid) && im->minval > minval)
1339         ) {
1340         if (im->logarithmic)
1341             im->minval = minval / 2.0;
1342         else
1343             im->minval = minval;
1344     }
1345     if (isnan(im->maxval)
1346         || (!im->rigid && im->maxval < maxval)
1347         ) {
1348         if (im->logarithmic)
1349             im->maxval = maxval * 2.0;
1350         else
1351             im->maxval = maxval;
1352     }
1353
1354     /* make sure min is smaller than max */
1355     if (im->minval > im->maxval) {
1356         if (im->minval > 0)
1357             im->minval = 0.99 * im->maxval;
1358         else
1359             im->minval = 1.01 * im->maxval;
1360     }
1361
1362     /* make sure min and max are not equal */
1363     if (AlmostEqual2sComplement(im->minval, im->maxval, 4)) {
1364         if (im->maxval > 0)
1365             im->maxval *= 1.01;
1366         else
1367             im->maxval *= 0.99;
1368
1369         /* make sure min and max are not both zero */
1370         if (AlmostEqual2sComplement(im->maxval, 0, 4)) {
1371             im->maxval = 1.0;
1372         }
1373     }
1374     return 0;
1375 }
1376
1377 static int find_first_weekday(void){
1378     static int first_weekday = -1;
1379     if (first_weekday == -1){
1380 #ifdef HAVE__NL_TIME_WEEK_1STDAY
1381         /* according to http://sourceware.org/ml/libc-locales/2009-q1/msg00011.html */
1382         long week_1stday_l = (long) nl_langinfo (_NL_TIME_WEEK_1STDAY);
1383         if (week_1stday_l == 19971130) first_weekday = 0; /* Sun */
1384         else if (week_1stday_l == 19971201) first_weekday = 1; /* Mon */
1385         else first_weekday = 1; /* we go for a monday default */
1386 #else
1387         first_weekday = 1;
1388 #endif
1389     }
1390     return first_weekday;
1391 }
1392
1393 /* identify the point where the first gridline, label ... gets placed */
1394
1395 time_t find_first_time(
1396     time_t start,       /* what is the initial time */
1397     enum tmt_en baseint,    /* what is the basic interval */
1398     long basestep       /* how many if these do we jump a time */
1399     )
1400 {
1401     struct tm tm;
1402
1403     localtime_r(&start, &tm);
1404
1405     switch (baseint) {
1406     case TMT_SECOND:
1407         tm.       tm_sec -= tm.tm_sec % basestep;
1408
1409         break;
1410     case TMT_MINUTE:
1411         tm.       tm_sec = 0;
1412         tm.       tm_min -= tm.tm_min % basestep;
1413
1414         break;
1415     case TMT_HOUR:
1416         tm.       tm_sec = 0;
1417         tm.       tm_min = 0;
1418         tm.       tm_hour -= tm.tm_hour % basestep;
1419
1420         break;
1421     case TMT_DAY:
1422         /* we do NOT look at the basestep for this ... */
1423         tm.       tm_sec = 0;
1424         tm.       tm_min = 0;
1425         tm.       tm_hour = 0;
1426
1427         break;
1428     case TMT_WEEK:
1429         /* we do NOT look at the basestep for this ... */
1430         tm.       tm_sec = 0;
1431         tm.       tm_min = 0;
1432         tm.       tm_hour = 0;
1433         tm.       tm_mday -= tm.tm_wday - find_first_weekday();
1434
1435         if (tm.tm_wday == 0 && find_first_weekday() > 0)
1436             tm.       tm_mday -= 7; /* we want the *previous* week */
1437
1438         break;
1439     case TMT_MONTH:
1440         tm.       tm_sec = 0;
1441         tm.       tm_min = 0;
1442         tm.       tm_hour = 0;
1443         tm.       tm_mday = 1;
1444         tm.       tm_mon -= tm.tm_mon % basestep;
1445
1446         break;
1447
1448     case TMT_YEAR:
1449         tm.       tm_sec = 0;
1450         tm.       tm_min = 0;
1451         tm.       tm_hour = 0;
1452         tm.       tm_mday = 1;
1453         tm.       tm_mon = 0;
1454         tm.       tm_year -= (
1455     tm.tm_year + 1900) %basestep;
1456
1457     }
1458     return mktime(&tm);
1459 }
1460
1461 /* identify the point where the next gridline, label ... gets placed */
1462 time_t find_next_time(
1463     time_t current,     /* what is the initial time */
1464     enum tmt_en baseint,    /* what is the basic interval */
1465     long basestep       /* how many if these do we jump a time */
1466     )
1467 {
1468     struct tm tm;
1469     time_t    madetime;
1470
1471     localtime_r(&current, &tm);
1472
1473     int limit = 2;
1474     switch (baseint) {
1475     case TMT_SECOND: limit = 7200; break;
1476     case TMT_MINUTE: limit = 120; break;
1477     case TMT_HOUR: limit = 2; break;
1478     default: limit = 2; break;
1479     }
1480     do {
1481         switch (baseint) {
1482         case TMT_SECOND:
1483             tm.       tm_sec += basestep;
1484
1485             break;
1486         case TMT_MINUTE:
1487             tm.       tm_min += basestep;
1488
1489             break;
1490         case TMT_HOUR:
1491             tm.       tm_hour += basestep;
1492
1493             break;
1494         case TMT_DAY:
1495             tm.       tm_mday += basestep;
1496
1497             break;
1498         case TMT_WEEK:
1499             tm.       tm_mday += 7 * basestep;
1500
1501             break;
1502         case TMT_MONTH:
1503             tm.       tm_mon += basestep;
1504
1505             break;
1506         case TMT_YEAR:
1507             tm.       tm_year += basestep;
1508         }
1509         madetime = mktime(&tm);
1510     } while (madetime == -1 && limit-- >= 0);   /* this is necessary to skip impossible times
1511                                    like the daylight saving time skips */
1512     return madetime;
1513
1514 }
1515
1516
1517 /* calculate values required for PRINT and GPRINT functions */
1518
1519 int print_calc(
1520     image_desc_t *im)
1521 {
1522     long      i, ii, validsteps;
1523     double    printval;
1524     struct tm tmvdef;
1525     int       graphelement = 0;
1526     long      vidx;
1527     int       max_ii;
1528     double    magfact = -1;
1529     char     *si_symb = "";
1530     char     *percent_s;
1531     int       prline_cnt = 0;
1532
1533     /* wow initializing tmvdef is quite a task :-) */
1534     time_t    now = time(NULL);
1535
1536     localtime_r(&now, &tmvdef);
1537     for (i = 0; i < im->gdes_c; i++) {
1538         vidx = im->gdes[i].vidx;
1539         switch (im->gdes[i].gf) {
1540         case GF_PRINT:
1541         case GF_GPRINT:
1542             /* PRINT and GPRINT can now print VDEF generated values.
1543              * There's no need to do any calculations on them as these
1544              * calculations were already made.
1545              */
1546             if (im->gdes[vidx].gf == GF_VDEF) { /* simply use vals */
1547                 printval = im->gdes[vidx].vf.val;
1548                 localtime_r(&im->gdes[vidx].vf.when, &tmvdef);
1549             } else {    /* need to calculate max,min,avg etcetera */
1550                 max_ii = ((im->gdes[vidx].end - im->gdes[vidx].start)
1551                           / im->gdes[vidx].step * im->gdes[vidx].ds_cnt);
1552                 printval = DNAN;
1553                 validsteps = 0;
1554                 for (ii = im->gdes[vidx].ds;
1555                      ii < max_ii; ii += im->gdes[vidx].ds_cnt) {
1556                     if (!finite(im->gdes[vidx].data[ii]))
1557                         continue;
1558                     if (isnan(printval)) {
1559                         printval = im->gdes[vidx].data[ii];
1560                         validsteps++;
1561                         continue;
1562                     }
1563
1564                     switch (im->gdes[i].cf) {
1565                     case CF_HWPREDICT:
1566                     case CF_MHWPREDICT:
1567                     case CF_DEVPREDICT:
1568                     case CF_DEVSEASONAL:
1569                     case CF_SEASONAL:
1570                     case CF_AVERAGE:
1571                         validsteps++;
1572                         printval += im->gdes[vidx].data[ii];
1573                         break;
1574                     case CF_MINIMUM:
1575                         printval = min(printval, im->gdes[vidx].data[ii]);
1576                         break;
1577                     case CF_FAILURES:
1578                     case CF_MAXIMUM:
1579                         printval = max(printval, im->gdes[vidx].data[ii]);
1580                         break;
1581                     case CF_LAST:
1582                         printval = im->gdes[vidx].data[ii];
1583                     }
1584                 }
1585                 if (im->gdes[i].cf == CF_AVERAGE || im->gdes[i].cf > CF_LAST) {
1586                     if (validsteps > 1) {
1587                         printval = (printval / validsteps);
1588                     }
1589                 }
1590             }           /* prepare printval */
1591
1592             if (!im->gdes[i].strftm && (percent_s = strstr(im->gdes[i].format, "%S")) != NULL) {
1593                 /* Magfact is set to -1 upon entry to print_calc.  If it
1594                  * is still less than 0, then we need to run auto_scale.
1595                  * Otherwise, put the value into the correct units.  If
1596                  * the value is 0, then do not set the symbol or magnification
1597                  * so next the calculation will be performed again. */
1598                 if (magfact < 0.0) {
1599                     auto_scale(im, &printval, &si_symb, &magfact);
1600                     if (printval == 0.0)
1601                         magfact = -1.0;
1602                 } else {
1603                     printval /= magfact;
1604                 }
1605                 *(++percent_s) = 's';
1606             } else if (!im->gdes[i].strftm && strstr(im->gdes[i].format, "%s") != NULL) {
1607                 auto_scale(im, &printval, &si_symb, &magfact);
1608             }
1609
1610             if (im->gdes[i].gf == GF_PRINT) {
1611                 rrd_infoval_t prline;
1612
1613                 if (im->gdes[i].strftm) {
1614                     prline.u_str = (char*)malloc((FMT_LEG_LEN + 2) * sizeof(char));
1615                     if (im->gdes[vidx].vf.never == 1) {
1616                        time_clean(prline.u_str, im->gdes[i].format);
1617                     } else {
1618                         strftime(prline.u_str,
1619                                  FMT_LEG_LEN, im->gdes[i].format, &tmvdef);
1620                     }
1621                 } else if (bad_format(im->gdes[i].format)) {
1622                     rrd_set_error
1623                         ("bad format for PRINT in '%s'", im->gdes[i].format);
1624                     return -1;
1625                 } else {
1626                     prline.u_str =
1627                         sprintf_alloc(im->gdes[i].format, printval, si_symb);
1628                 }
1629                 grinfo_push(im,
1630                             sprintf_alloc
1631                             ("print[%ld]", prline_cnt++), RD_I_STR, prline);
1632                 free(prline.u_str);
1633             } else {
1634                 /* GF_GPRINT */
1635
1636                 if (im->gdes[i].strftm) {
1637                     if (im->gdes[vidx].vf.never == 1) {
1638                        time_clean(im->gdes[i].legend, im->gdes[i].format);
1639                     } else {
1640                         strftime(im->gdes[i].legend,
1641                                  FMT_LEG_LEN, im->gdes[i].format, &tmvdef);
1642                     }
1643                 } else {
1644                     if (bad_format(im->gdes[i].format)) {
1645                         rrd_set_error
1646                             ("bad format for GPRINT in '%s'",
1647                              im->gdes[i].format);
1648                         return -1;
1649                     }
1650 #ifdef HAVE_SNPRINTF
1651                     snprintf(im->gdes[i].legend,
1652                              FMT_LEG_LEN - 2,
1653                              im->gdes[i].format, printval, si_symb);
1654 #else
1655                     sprintf(im->gdes[i].legend,
1656                             im->gdes[i].format, printval, si_symb);
1657 #endif
1658                 }
1659                 graphelement = 1;
1660             }
1661             break;
1662         case GF_LINE:
1663         case GF_AREA:
1664                 case GF_GRAD:
1665         case GF_TICK:
1666             graphelement = 1;
1667             break;
1668         case GF_HRULE:
1669             if (isnan(im->gdes[i].yrule)) { /* we must set this here or the legend printer can not decide to print the legend */
1670                 im->gdes[i].yrule = im->gdes[vidx].vf.val;
1671             };
1672             graphelement = 1;
1673             break;
1674         case GF_VRULE:
1675             if (im->gdes[i].xrule == 0) {   /* again ... the legend printer needs it */
1676                 im->gdes[i].xrule = im->gdes[vidx].vf.when;
1677             };
1678             graphelement = 1;
1679             break;
1680         case GF_COMMENT:
1681         case GF_TEXTALIGN:
1682         case GF_DEF:
1683         case GF_CDEF:
1684         case GF_VDEF:
1685 #ifdef WITH_PIECHART
1686         case GF_PART:
1687 #endif
1688         case GF_SHIFT:
1689         case GF_XPORT:
1690             break;
1691         case GF_STACK:
1692             rrd_set_error
1693                 ("STACK should already be turned into LINE or AREA here");
1694             return -1;
1695             break;
1696         }
1697     }
1698     return graphelement;
1699 }
1700
1701
1702
1703 /* place legends with color spots */
1704 int leg_place(
1705     image_desc_t *im,
1706     int calc_width)
1707 {
1708     /* graph labels */
1709     int       interleg = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
1710     int       border = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
1711     int       fill = 0, fill_last;
1712     double    legendwidth; // = im->ximg - 2 * border;
1713     int       leg_c = 0;
1714     double    leg_x = border;
1715     int       leg_y = 0; //im->yimg;
1716     int       leg_y_prev = 0; // im->yimg;
1717     int       leg_cc;
1718     double    glue = 0;
1719     int       i, ii, mark = 0;
1720     char      default_txtalign = TXA_JUSTIFIED; /*default line orientation */
1721     int      *legspace;
1722     char     *tab;
1723     char      saved_legend[FMT_LEG_LEN + 5];
1724
1725     if(calc_width){
1726         legendwidth = 0;
1727     }
1728     else{
1729         legendwidth = im->legendwidth - 2 * border;
1730     }
1731
1732
1733     if (!(im->extra_flags & NOLEGEND) && !(im->extra_flags & ONLY_GRAPH)) {
1734         if ((legspace = (int*)malloc(im->gdes_c * sizeof(int))) == NULL) {
1735             rrd_set_error("malloc for legspace");
1736             return -1;
1737         }
1738
1739         for (i = 0; i < im->gdes_c; i++) {
1740             char      prt_fctn; /*special printfunctions */
1741             if(calc_width){
1742                 strcpy(saved_legend, im->gdes[i].legend);
1743             }
1744
1745             fill_last = fill;
1746             /* hide legends for rules which are not displayed */
1747             if (im->gdes[i].gf == GF_TEXTALIGN) {
1748                 default_txtalign = im->gdes[i].txtalign;
1749             }
1750
1751             if (!(im->extra_flags & FORCE_RULES_LEGEND)) {
1752                 if (im->gdes[i].gf == GF_HRULE
1753                     && (im->gdes[i].yrule <
1754                         im->minval || im->gdes[i].yrule > im->maxval))
1755                     im->gdes[i].legend[0] = '\0';
1756                 if (im->gdes[i].gf == GF_VRULE
1757                     && (im->gdes[i].xrule <
1758                         im->start || im->gdes[i].xrule > im->end))
1759                     im->gdes[i].legend[0] = '\0';
1760             }
1761
1762             /* turn \\t into tab */
1763             while ((tab = strstr(im->gdes[i].legend, "\\t"))) {
1764                 memmove(tab, tab + 1, strlen(tab));
1765                 tab[0] = (char) 9;
1766             }
1767
1768             leg_cc = strlen(im->gdes[i].legend);
1769             /* is there a controle code at the end of the legend string ? */
1770             if (leg_cc >= 2 && im->gdes[i].legend[leg_cc - 2] == '\\') {
1771                 prt_fctn = im->gdes[i].legend[leg_cc - 1];
1772                 leg_cc -= 2;
1773                 im->gdes[i].legend[leg_cc] = '\0';
1774             } else {
1775                 prt_fctn = '\0';
1776             }
1777             /* only valid control codes */
1778             if (prt_fctn != 'l' && prt_fctn != 'n' &&   /* a synonym for l */
1779                 prt_fctn != 'r' &&
1780                 prt_fctn != 'j' &&
1781                 prt_fctn != 'c' &&
1782                 prt_fctn != 'u' &&
1783                 prt_fctn != 's' && prt_fctn != '\0' && prt_fctn != 'g') {
1784                 free(legspace);
1785                 rrd_set_error
1786                     ("Unknown control code at the end of '%s\\%c'",
1787                      im->gdes[i].legend, prt_fctn);
1788                 return -1;
1789             }
1790             /* \n -> \l */
1791             if (prt_fctn == 'n') {
1792                 prt_fctn = 'l';
1793             }
1794
1795             /* remove exess space from the end of the legend for \g */
1796             while (prt_fctn == 'g' &&
1797                    leg_cc > 0 && im->gdes[i].legend[leg_cc - 1] == ' ') {
1798                 leg_cc--;
1799                 im->gdes[i].legend[leg_cc] = '\0';
1800             }
1801
1802             if (leg_cc != 0) {
1803
1804                 /* no interleg space if string ends in \g */
1805                 legspace[i] = (prt_fctn == 'g' ? 0 : interleg);
1806                 if (fill > 0) {
1807                     fill += legspace[i];
1808                 }
1809                 fill +=
1810                     gfx_get_text_width(im,
1811                                        fill + border,
1812                                        im->
1813                                        text_prop
1814                                        [TEXT_PROP_LEGEND].
1815                                        font_desc,
1816                                        im->tabwidth, im->gdes[i].legend);
1817                 leg_c++;
1818             } else {
1819                 legspace[i] = 0;
1820             }
1821             /* who said there was a special tag ... ? */
1822             if (prt_fctn == 'g') {
1823                 prt_fctn = '\0';
1824             }
1825
1826             if (prt_fctn == '\0') {
1827                 if(calc_width && (fill > legendwidth)){
1828                     legendwidth = fill;
1829                 }
1830                 if (i == im->gdes_c - 1 || fill > legendwidth) {
1831                     /* just one legend item is left right or center */
1832                     switch (default_txtalign) {
1833                     case TXA_RIGHT:
1834                         prt_fctn = 'r';
1835                         break;
1836                     case TXA_CENTER:
1837                         prt_fctn = 'c';
1838                         break;
1839                     case TXA_JUSTIFIED:
1840                         prt_fctn = 'j';
1841                         break;
1842                     default:
1843                         prt_fctn = 'l';
1844                         break;
1845                     }
1846                 }
1847                 /* is it time to place the legends ? */
1848                 if (fill > legendwidth) {
1849                     if (leg_c > 1) {
1850                         /* go back one */
1851                         i--;
1852                         fill = fill_last;
1853                         leg_c--;
1854                     }
1855                 }
1856                 if (leg_c == 1 && prt_fctn == 'j') {
1857                     prt_fctn = 'l';
1858                 }
1859             }
1860
1861             if (prt_fctn != '\0') {
1862                 leg_x = border;
1863                 if (leg_c >= 2 && prt_fctn == 'j') {
1864                     glue = (double)(legendwidth - fill) / (double)(leg_c - 1);
1865                 } else {
1866                     glue = 0;
1867                 }
1868                 if (prt_fctn == 'c')
1869                     leg_x = border + (double)(legendwidth - fill) / 2.0;
1870                 if (prt_fctn == 'r')
1871                     leg_x = legendwidth - fill + border;
1872                 for (ii = mark; ii <= i; ii++) {
1873                     if (im->gdes[ii].legend[0] == '\0')
1874                         continue;   /* skip empty legends */
1875                     im->gdes[ii].leg_x = leg_x;
1876                     im->gdes[ii].leg_y = leg_y + border;
1877                     leg_x +=
1878                         (double)gfx_get_text_width(im, leg_x,
1879                                            im->
1880                                            text_prop
1881                                            [TEXT_PROP_LEGEND].
1882                                            font_desc,
1883                                            im->tabwidth, im->gdes[ii].legend)
1884                         +(double)legspace[ii]
1885                         + glue;
1886                 }
1887                 leg_y_prev = leg_y;
1888                 if (leg_x > border || prt_fctn == 's')
1889                     leg_y += im->text_prop[TEXT_PROP_LEGEND].size * 1.8;
1890                 if (prt_fctn == 's')
1891                     leg_y -= im->text_prop[TEXT_PROP_LEGEND].size;
1892                 if (prt_fctn == 'u')
1893                     leg_y -= im->text_prop[TEXT_PROP_LEGEND].size *1.8;
1894
1895                 if(calc_width && (fill > legendwidth)){
1896                     legendwidth = fill;
1897                 }
1898                 fill = 0;
1899                 leg_c = 0;
1900                 mark = ii;
1901             }
1902
1903             if(calc_width){
1904                 strcpy(im->gdes[i].legend, saved_legend);
1905             }
1906         }
1907
1908         if(calc_width){
1909             im->legendwidth = legendwidth + 2 * border;
1910         }
1911         else{
1912             im->legendheight = leg_y + border * 0.6;
1913         }
1914         free(legspace);
1915     }
1916     return 0;
1917 }
1918
1919 /* create a grid on the graph. it determines what to do
1920    from the values of xsize, start and end */
1921
1922 /* the xaxis labels are determined from the number of seconds per pixel
1923    in the requested graph */
1924
1925 int calc_horizontal_grid(
1926     image_desc_t
1927     *im)
1928 {
1929     double    range;
1930     double    scaledrange;
1931     int       pixel, i;
1932     int       gridind = 0;
1933     int       decimals, fractionals;
1934
1935     im->ygrid_scale.labfact = 2;
1936     range = im->maxval - im->minval;
1937     scaledrange = range / im->magfact;
1938     /* does the scale of this graph make it impossible to put lines
1939        on it? If so, give up. */
1940     if (isnan(scaledrange)) {
1941         return 0;
1942     }
1943
1944     /* find grid spaceing */
1945     pixel = 1;
1946     if (isnan(im->ygridstep)) {
1947         if (im->extra_flags & ALTYGRID) {
1948             /* find the value with max number of digits. Get number of digits */
1949             decimals =
1950                 ceil(log10
1951                      (max(fabs(im->maxval), fabs(im->minval)) *
1952                       im->viewfactor / im->magfact));
1953             if (decimals <= 0)  /* everything is small. make place for zero */
1954                 decimals = 1;
1955             im->ygrid_scale.gridstep =
1956                 pow((double) 10,
1957                     floor(log10(range * im->viewfactor / im->magfact))) /
1958                 im->viewfactor * im->magfact;
1959             if (im->ygrid_scale.gridstep == 0)  /* range is one -> 0.1 is reasonable scale */
1960                 im->ygrid_scale.gridstep = 0.1;
1961             /* should have at least 5 lines but no more then 15 */
1962             if (range / im->ygrid_scale.gridstep < 5
1963                 && im->ygrid_scale.gridstep >= 30)
1964                 im->ygrid_scale.gridstep /= 10;
1965             if (range / im->ygrid_scale.gridstep > 15)
1966                 im->ygrid_scale.gridstep *= 10;
1967             if (range / im->ygrid_scale.gridstep > 5) {
1968                 im->ygrid_scale.labfact = 1;
1969                 if (range / im->ygrid_scale.gridstep > 8
1970                     || im->ygrid_scale.gridstep <
1971                     1.8 * im->text_prop[TEXT_PROP_AXIS].size)
1972                     im->ygrid_scale.labfact = 2;
1973             } else {
1974                 im->ygrid_scale.gridstep /= 5;
1975                 im->ygrid_scale.labfact = 5;
1976             }
1977             fractionals =
1978                 floor(log10
1979                       (im->ygrid_scale.gridstep *
1980                        (double) im->ygrid_scale.labfact * im->viewfactor /
1981                        im->magfact));
1982             if (fractionals < 0) {  /* small amplitude. */
1983                 int       len = decimals - fractionals + 1;
1984
1985                 if (im->unitslength < len + 2)
1986                     im->unitslength = len + 2;
1987                 sprintf(im->ygrid_scale.labfmt,
1988                         "%%%d.%df%s", len,
1989                         -fractionals, (im->symbol != ' ' ? " %c" : ""));
1990             } else {
1991                 int       len = decimals + 1;
1992
1993                 if (im->unitslength < len + 2)
1994                     im->unitslength = len + 2;
1995                 sprintf(im->ygrid_scale.labfmt,
1996                         "%%%d.0f%s", len, (im->symbol != ' ' ? " %c" : ""));
1997             }
1998         } else {        /* classic rrd grid */
1999             for (i = 0; ylab[i].grid > 0; i++) {
2000                 pixel = im->ysize / (scaledrange / ylab[i].grid);
2001                 gridind = i;
2002                 if (pixel >= 5)
2003                     break;
2004             }
2005
2006             for (i = 0; i < 4; i++) {
2007                 if (pixel * ylab[gridind].lfac[i] >=
2008                     1.8 * im->text_prop[TEXT_PROP_AXIS].size) {
2009                     im->ygrid_scale.labfact = ylab[gridind].lfac[i];
2010                     break;
2011                 }
2012             }
2013
2014             im->ygrid_scale.gridstep = ylab[gridind].grid * im->magfact;
2015         }
2016     } else {
2017         im->ygrid_scale.gridstep = im->ygridstep;
2018         im->ygrid_scale.labfact = im->ylabfact;
2019     }
2020     return 1;
2021 }
2022
2023 int draw_horizontal_grid(
2024     image_desc_t
2025     *im)
2026 {
2027     int       i;
2028     double    scaledstep;
2029     char      graph_label[100];
2030     int       nlabels = 0;
2031     double    X0 = im->xorigin;
2032     double    X1 = im->xorigin + im->xsize;
2033     int       sgrid = (int) (im->minval / im->ygrid_scale.gridstep - 1);
2034     int       egrid = (int) (im->maxval / im->ygrid_scale.gridstep + 1);
2035     double    MaxY;
2036     double second_axis_magfact = 0;
2037     char *second_axis_symb = "";
2038
2039     scaledstep =
2040         im->ygrid_scale.gridstep /
2041         (double) im->magfact * (double) im->viewfactor;
2042     MaxY = scaledstep * (double) egrid;
2043     for (i = sgrid; i <= egrid; i++) {
2044         double    Y0 = ytr(im,
2045                            im->ygrid_scale.gridstep * i);
2046         double    YN = ytr(im,
2047                            im->ygrid_scale.gridstep * (i + 1));
2048
2049         if (floor(Y0 + 0.5) >=
2050             im->yorigin - im->ysize && floor(Y0 + 0.5) <= im->yorigin) {
2051             /* Make sure at least 2 grid labels are shown, even if it doesn't agree
2052                with the chosen settings. Add a label if required by settings, or if
2053                there is only one label so far and the next grid line is out of bounds. */
2054             if (i % im->ygrid_scale.labfact == 0
2055                 || (nlabels == 1
2056                     && (YN < im->yorigin - im->ysize || YN > im->yorigin))) {
2057                 if (im->symbol == ' ') {
2058                     if (im->extra_flags & ALTYGRID) {
2059                         sprintf(graph_label,
2060                                 im->ygrid_scale.labfmt,
2061                                 scaledstep * (double) i);
2062                     } else {
2063                         if (MaxY < 10) {
2064                             sprintf(graph_label, "%4.1f",
2065                                     scaledstep * (double) i);
2066                         } else {
2067                             sprintf(graph_label, "%4.0f",
2068                                     scaledstep * (double) i);
2069                         }
2070                     }
2071                 } else {
2072                     char      sisym = (i == 0 ? ' ' : im->symbol);
2073
2074                     if (im->extra_flags & ALTYGRID) {
2075                         sprintf(graph_label,
2076                                 im->ygrid_scale.labfmt,
2077                                 scaledstep * (double) i, sisym);
2078                     } else {
2079                         if (MaxY < 10) {
2080                             sprintf(graph_label, "%4.1f %c",
2081                                     scaledstep * (double) i, sisym);
2082                         } else {
2083                             sprintf(graph_label, "%4.0f %c",
2084                                     scaledstep * (double) i, sisym);
2085                         }
2086                     }
2087                 }
2088                 nlabels++;
2089                 if (im->second_axis_scale != 0){
2090                         char graph_label_right[100];
2091                         double sval = im->ygrid_scale.gridstep*(double)i*im->second_axis_scale+im->second_axis_shift;
2092                         if (im->second_axis_format[0] == '\0'){
2093                             if (!second_axis_magfact){
2094                                 double dummy = im->ygrid_scale.gridstep*(double)(sgrid+egrid)/2.0*im->second_axis_scale+im->second_axis_shift;
2095                                 auto_scale(im,&dummy,&second_axis_symb,&second_axis_magfact);
2096                             }
2097                             sval /= second_axis_magfact;
2098
2099                             if(MaxY < 10) {
2100                                 sprintf(graph_label_right,"%5.1f %s",sval,second_axis_symb);
2101                             } else {
2102                                 sprintf(graph_label_right,"%5.0f %s",sval,second_axis_symb);
2103                             }
2104                         }
2105                         else {
2106                            sprintf(graph_label_right,im->second_axis_format,sval);
2107                         }
2108                         gfx_text ( im,
2109                                X1+7, Y0,
2110                                im->graph_col[GRC_FONT],
2111                                im->text_prop[TEXT_PROP_AXIS].font_desc,
2112                                im->tabwidth,0.0, GFX_H_LEFT, GFX_V_CENTER,
2113                                graph_label_right );
2114                 }
2115
2116                 gfx_text(im,
2117                          X0 -
2118                          im->
2119                          text_prop[TEXT_PROP_AXIS].
2120                          size, Y0,
2121                          im->graph_col[GRC_FONT],
2122                          im->
2123                          text_prop[TEXT_PROP_AXIS].
2124                          font_desc,
2125                          im->tabwidth, 0.0,
2126                          GFX_H_RIGHT, GFX_V_CENTER, graph_label);
2127                 gfx_line(im, X0 - 2, Y0, X0, Y0,
2128                          MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2129                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2130                          MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2131                 gfx_dashed_line(im, X0 - 2, Y0,
2132                                 X1 + 2, Y0,
2133                                 MGRIDWIDTH,
2134                                 im->
2135                                 graph_col
2136                                 [GRC_MGRID],
2137                                 im->grid_dash_on, im->grid_dash_off);
2138             } else if (!(im->extra_flags & NOMINOR)) {
2139                 gfx_line(im,
2140                          X0 - 2, Y0,
2141                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2142                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2143                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2144                 gfx_dashed_line(im, X0 - 1, Y0,
2145                                 X1 + 1, Y0,
2146                                 GRIDWIDTH,
2147                                 im->
2148                                 graph_col[GRC_GRID],
2149                                 im->grid_dash_on, im->grid_dash_off);
2150             }
2151         }
2152     }
2153     return 1;
2154 }
2155
2156 /* this is frexp for base 10 */
2157 double    frexp10(
2158     double,
2159     double *);
2160 double frexp10(
2161     double x,
2162     double *e)
2163 {
2164     double    mnt;
2165     int       iexp;
2166
2167     iexp = floor(log((double)fabs(x)) / log((double)10));
2168     mnt = x / pow(10.0, iexp);
2169     if (mnt >= 10.0) {
2170         iexp++;
2171         mnt = x / pow(10.0, iexp);
2172     }
2173     *e = iexp;
2174     return mnt;
2175 }
2176
2177
2178 /* logaritmic horizontal grid */
2179 int horizontal_log_grid(
2180     image_desc_t
2181     *im)
2182 {
2183     double    yloglab[][10] = {
2184         {
2185          1.0, 10., 0.0, 0.0, 0.0, 0.0, 0.0,
2186          0.0, 0.0, 0.0}, {
2187                           1.0, 5.0, 10., 0.0, 0.0, 0.0, 0.0,
2188                           0.0, 0.0, 0.0}, {
2189                                            1.0, 2.0, 5.0, 7.0, 10., 0.0, 0.0,
2190                                            0.0, 0.0, 0.0}, {
2191                                                             1.0, 2.0, 4.0,
2192                                                             6.0, 8.0, 10.,
2193                                                             0.0,
2194                                                             0.0, 0.0, 0.0}, {
2195                                                                              1.0,
2196                                                                              2.0,
2197                                                                              3.0,
2198                                                                              4.0,
2199                                                                              5.0,
2200                                                                              6.0,
2201                                                                              7.0,
2202                                                                              8.0,
2203                                                                              9.0,
2204                                                                              10.},
2205         {
2206          0, 0, 0, 0, 0, 0, 0, 0, 0, 0}  /* last line */
2207     };
2208     int       i, j, val_exp, min_exp;
2209     double    nex;      /* number of decades in data */
2210     double    logscale; /* scale in logarithmic space */
2211     int       exfrac = 1;   /* decade spacing */
2212     int       mid = -1; /* row in yloglab for major grid */
2213     double    mspac;    /* smallest major grid spacing (pixels) */
2214     int       flab;     /* first value in yloglab to use */
2215     double    value, tmp, pre_value;
2216     double    X0, X1, Y0;
2217     char      graph_label[100];
2218
2219     nex = log10(im->maxval / im->minval);
2220     logscale = im->ysize / nex;
2221     /* major spacing for data with high dynamic range */
2222     while (logscale * exfrac < 3 * im->text_prop[TEXT_PROP_LEGEND].size) {
2223         if (exfrac == 1)
2224             exfrac = 3;
2225         else
2226             exfrac += 3;
2227     }
2228
2229     /* major spacing for less dynamic data */
2230     do {
2231         /* search best row in yloglab */
2232         mid++;
2233         for (i = 0; yloglab[mid][i + 1] < 10.0; i++);
2234         mspac = logscale * log10(10.0 / yloglab[mid][i]);
2235     }
2236     while (mspac >
2237            2 * im->text_prop[TEXT_PROP_LEGEND].size && yloglab[mid][0] > 0);
2238     if (mid)
2239         mid--;
2240     /* find first value in yloglab */
2241     for (flab = 0;
2242          yloglab[mid][flab] < 10
2243          && frexp10(im->minval, &tmp) > yloglab[mid][flab]; flab++);
2244     if (yloglab[mid][flab] == 10.0) {
2245         tmp += 1.0;
2246         flab = 0;
2247     }
2248     val_exp = tmp;
2249     if (val_exp % exfrac)
2250         val_exp += abs(-val_exp % exfrac);
2251     X0 = im->xorigin;
2252     X1 = im->xorigin + im->xsize;
2253     /* draw grid */
2254     pre_value = DNAN;
2255     while (1) {
2256
2257         value = yloglab[mid][flab] * pow(10.0, val_exp);
2258         if (AlmostEqual2sComplement(value, pre_value, 4))
2259             break;      /* it seems we are not converging */
2260         pre_value = value;
2261         Y0 = ytr(im, value);
2262         if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2263             break;
2264         /* major grid line */
2265         gfx_line(im,
2266                  X0 - 2, Y0, X0, Y0, MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2267         gfx_line(im, X1, Y0, X1 + 2, Y0,
2268                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2269         gfx_dashed_line(im, X0 - 2, Y0,
2270                         X1 + 2, Y0,
2271                         MGRIDWIDTH,
2272                         im->
2273                         graph_col
2274                         [GRC_MGRID], im->grid_dash_on, im->grid_dash_off);
2275         /* label */
2276         if (im->extra_flags & FORCE_UNITS_SI) {
2277             int       scale;
2278             double    pvalue;
2279             char      symbol;
2280
2281             scale = floor(val_exp / 3.0);
2282             if (value >= 1.0)
2283                 pvalue = pow(10.0, val_exp % 3);
2284             else
2285                 pvalue = pow(10.0, ((val_exp + 1) % 3) + 2);
2286             pvalue *= yloglab[mid][flab];
2287             if (((scale + si_symbcenter) < (int) sizeof(si_symbol))
2288                 && ((scale + si_symbcenter) >= 0))
2289                 symbol = si_symbol[scale + si_symbcenter];
2290             else
2291                 symbol = '?';
2292             sprintf(graph_label, "%3.0f %c", pvalue, symbol);
2293         } else {
2294             sprintf(graph_label, "%3.0e", value);
2295         }
2296         if (im->second_axis_scale != 0){
2297                 char graph_label_right[100];
2298                 double sval = value*im->second_axis_scale+im->second_axis_shift;
2299                 if (im->second_axis_format[0] == '\0'){
2300                         if (im->extra_flags & FORCE_UNITS_SI) {
2301                                 double mfac = 1;
2302                                 char   *symb = "";
2303                                 auto_scale(im,&sval,&symb,&mfac);
2304                                 sprintf(graph_label_right,"%4.0f %s", sval,symb);
2305                         }
2306                         else {
2307                                 sprintf(graph_label_right,"%3.0e", sval);
2308                         }
2309                 }
2310                 else {
2311                       sprintf(graph_label_right,im->second_axis_format,sval,"");
2312                 }
2313
2314                 gfx_text ( im,
2315                                X1+7, Y0,
2316                                im->graph_col[GRC_FONT],
2317                                im->text_prop[TEXT_PROP_AXIS].font_desc,
2318                                im->tabwidth,0.0, GFX_H_LEFT, GFX_V_CENTER,
2319                                graph_label_right );
2320         }
2321
2322         gfx_text(im,
2323                  X0 -
2324                  im->
2325                  text_prop[TEXT_PROP_AXIS].
2326                  size, Y0,
2327                  im->graph_col[GRC_FONT],
2328                  im->
2329                  text_prop[TEXT_PROP_AXIS].
2330                  font_desc,
2331                  im->tabwidth, 0.0,
2332                  GFX_H_RIGHT, GFX_V_CENTER, graph_label);
2333         /* minor grid */
2334         if (mid < 4 && exfrac == 1) {
2335             /* find first and last minor line behind current major line
2336              * i is the first line and j tha last */
2337             if (flab == 0) {
2338                 min_exp = val_exp - 1;
2339                 for (i = 1; yloglab[mid][i] < 10.0; i++);
2340                 i = yloglab[mid][i - 1] + 1;
2341                 j = 10;
2342             } else {
2343                 min_exp = val_exp;
2344                 i = yloglab[mid][flab - 1] + 1;
2345                 j = yloglab[mid][flab];
2346             }
2347
2348             /* draw minor lines below current major line */
2349             for (; i < j; i++) {
2350
2351                 value = i * pow(10.0, min_exp);
2352                 if (value < im->minval)
2353                     continue;
2354                 Y0 = ytr(im, value);
2355                 if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2356                     break;
2357                 /* draw lines */
2358                 gfx_line(im,
2359                          X0 - 2, Y0,
2360                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2361                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2362                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2363                 gfx_dashed_line(im, X0 - 1, Y0,
2364                                 X1 + 1, Y0,
2365                                 GRIDWIDTH,
2366                                 im->
2367                                 graph_col[GRC_GRID],
2368                                 im->grid_dash_on, im->grid_dash_off);
2369             }
2370         } else if (exfrac > 1) {
2371             for (i = val_exp - exfrac / 3 * 2; i < val_exp; i += exfrac / 3) {
2372                 value = pow(10.0, i);
2373                 if (value < im->minval)
2374                     continue;
2375                 Y0 = ytr(im, value);
2376                 if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2377                     break;
2378                 /* draw lines */
2379                 gfx_line(im,
2380                          X0 - 2, Y0,
2381                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2382                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2383                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2384                 gfx_dashed_line(im, X0 - 1, Y0,
2385                                 X1 + 1, Y0,
2386                                 GRIDWIDTH,
2387                                 im->
2388                                 graph_col[GRC_GRID],
2389                                 im->grid_dash_on, im->grid_dash_off);
2390             }
2391         }
2392
2393         /* next decade */
2394         if (yloglab[mid][++flab] == 10.0) {
2395             flab = 0;
2396             val_exp += exfrac;
2397         }
2398     }
2399
2400     /* draw minor lines after highest major line */
2401     if (mid < 4 && exfrac == 1) {
2402         /* find first and last minor line below current major line
2403          * i is the first line and j tha last */
2404         if (flab == 0) {
2405             min_exp = val_exp - 1;
2406             for (i = 1; yloglab[mid][i] < 10.0; i++);
2407             i = yloglab[mid][i - 1] + 1;
2408             j = 10;
2409         } else {
2410             min_exp = val_exp;
2411             i = yloglab[mid][flab - 1] + 1;
2412             j = yloglab[mid][flab];
2413         }
2414
2415         /* draw minor lines below current major line */
2416         for (; i < j; i++) {
2417
2418             value = i * pow(10.0, min_exp);
2419             if (value < im->minval)
2420                 continue;
2421             Y0 = ytr(im, value);
2422             if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2423                 break;
2424             /* draw lines */
2425             gfx_line(im,
2426                      X0 - 2, Y0, X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2427             gfx_line(im, X1, Y0, X1 + 2, Y0,
2428                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2429             gfx_dashed_line(im, X0 - 1, Y0,
2430                             X1 + 1, Y0,
2431                             GRIDWIDTH,
2432                             im->
2433                             graph_col[GRC_GRID],
2434                             im->grid_dash_on, im->grid_dash_off);
2435         }
2436     }
2437     /* fancy minor gridlines */
2438     else if (exfrac > 1) {
2439         for (i = val_exp - exfrac / 3 * 2; i < val_exp; i += exfrac / 3) {
2440             value = pow(10.0, i);
2441             if (value < im->minval)
2442                 continue;
2443             Y0 = ytr(im, value);
2444             if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2445                 break;
2446             /* draw lines */
2447             gfx_line(im,
2448                      X0 - 2, Y0, X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2449             gfx_line(im, X1, Y0, X1 + 2, Y0,
2450                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2451             gfx_dashed_line(im, X0 - 1, Y0,
2452                             X1 + 1, Y0,
2453                             GRIDWIDTH,
2454                             im->
2455                             graph_col[GRC_GRID],
2456                             im->grid_dash_on, im->grid_dash_off);
2457         }
2458     }
2459
2460     return 1;
2461 }
2462
2463
2464 void vertical_grid(
2465     image_desc_t *im)
2466 {
2467     int       xlab_sel; /* which sort of label and grid ? */
2468     time_t    ti, tilab, timajor;
2469     long      factor;
2470     char      graph_label[100];
2471     double    X0, Y0, Y1;   /* points for filled graph and more */
2472     struct tm tm;
2473
2474     /* the type of time grid is determined by finding
2475        the number of seconds per pixel in the graph */
2476     if (im->xlab_user.minsec == -1) {
2477         factor = (im->end - im->start) / im->xsize;
2478         xlab_sel = 0;
2479         while (xlab[xlab_sel + 1].minsec !=
2480                -1 && xlab[xlab_sel + 1].minsec <= factor) {
2481             xlab_sel++;
2482         }               /* pick the last one */
2483         while (xlab[xlab_sel - 1].minsec ==
2484                xlab[xlab_sel].minsec
2485                && xlab[xlab_sel].length > (im->end - im->start)) {
2486             xlab_sel--;
2487         }               /* go back to the smallest size */
2488         im->xlab_user.gridtm = xlab[xlab_sel].gridtm;
2489         im->xlab_user.gridst = xlab[xlab_sel].gridst;
2490         im->xlab_user.mgridtm = xlab[xlab_sel].mgridtm;
2491         im->xlab_user.mgridst = xlab[xlab_sel].mgridst;
2492         im->xlab_user.labtm = xlab[xlab_sel].labtm;
2493         im->xlab_user.labst = xlab[xlab_sel].labst;
2494         im->xlab_user.precis = xlab[xlab_sel].precis;
2495         im->xlab_user.stst = xlab[xlab_sel].stst;
2496     }
2497
2498     /* y coords are the same for every line ... */
2499     Y0 = im->yorigin;
2500     Y1 = im->yorigin - im->ysize;
2501     /* paint the minor grid */
2502     if (!(im->extra_flags & NOMINOR)) {
2503         for (ti = find_first_time(im->start,
2504                                   im->
2505                                   xlab_user.
2506                                   gridtm,
2507                                   im->
2508                                   xlab_user.
2509                                   gridst),
2510              timajor =
2511              find_first_time(im->start,
2512                              im->xlab_user.
2513                              mgridtm,
2514                              im->xlab_user.
2515                              mgridst);
2516              ti < im->end && ti != -1;
2517              ti =
2518              find_next_time(ti, im->xlab_user.gridtm, im->xlab_user.gridst)
2519             ) {
2520             /* are we inside the graph ? */
2521             if (ti < im->start || ti > im->end)
2522                 continue;
2523             while (timajor < ti && timajor != -1) {
2524                 timajor = find_next_time(timajor,
2525                                          im->
2526                                          xlab_user.
2527                                          mgridtm, im->xlab_user.mgridst);
2528             }
2529             if (timajor == -1) break; /* fail in case of problems with time increments */
2530             if (ti == timajor)
2531                 continue;   /* skip as falls on major grid line */
2532             X0 = xtr(im, ti);
2533             gfx_line(im, X0, Y1 - 2, X0, Y1,
2534                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2535             gfx_line(im, X0, Y0, X0, Y0 + 2,
2536                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2537             gfx_dashed_line(im, X0, Y0 + 1, X0,
2538                             Y1 - 1, GRIDWIDTH,
2539                             im->
2540                             graph_col[GRC_GRID],
2541                             im->grid_dash_on, im->grid_dash_off);
2542         }
2543     }
2544
2545     /* paint the major grid */
2546     for (ti = find_first_time(im->start,
2547                               im->
2548                               xlab_user.
2549                               mgridtm,
2550                               im->
2551                               xlab_user.
2552                               mgridst);
2553          ti < im->end && ti != -1;
2554          ti = find_next_time(ti, im->xlab_user.mgridtm, im->xlab_user.mgridst)
2555         ) {
2556         /* are we inside the graph ? */
2557         if (ti < im->start || ti > im->end)
2558             continue;
2559         X0 = xtr(im, ti);
2560         gfx_line(im, X0, Y1 - 2, X0, Y1,
2561                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2562         gfx_line(im, X0, Y0, X0, Y0 + 3,
2563                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2564         gfx_dashed_line(im, X0, Y0 + 3, X0,
2565                         Y1 - 2, MGRIDWIDTH,
2566                         im->
2567                         graph_col
2568                         [GRC_MGRID], im->grid_dash_on, im->grid_dash_off);
2569     }
2570     /* paint the labels below the graph */
2571     for (ti =
2572          find_first_time(im->start -
2573                          im->xlab_user.
2574                          precis / 2,
2575                          im->xlab_user.
2576                          labtm,
2577                          im->xlab_user.
2578                          labst);
2579          (ti <=
2580          im->end -
2581          im->xlab_user.precis / 2) && ti != -1;
2582          ti = find_next_time(ti, im->xlab_user.labtm, im->xlab_user.labst)
2583         ) {
2584         tilab = ti + im->xlab_user.precis / 2;  /* correct time for the label */
2585         /* are we inside the graph ? */
2586         if (tilab < im->start || tilab > im->end)
2587             continue;
2588 #if HAVE_STRFTIME
2589         localtime_r(&tilab, &tm);
2590         strftime(graph_label, 99, im->xlab_user.stst, &tm);
2591 #else
2592 # error "your libc has no strftime I guess we'll abort the exercise here."
2593 #endif
2594         gfx_text(im,
2595                  xtr(im, tilab),
2596                  Y0 + 3,
2597                  im->graph_col[GRC_FONT],
2598                  im->
2599                  text_prop[TEXT_PROP_AXIS].
2600                  font_desc,
2601                  im->tabwidth, 0.0,
2602                  GFX_H_CENTER, GFX_V_TOP, graph_label);
2603     }
2604
2605 }
2606
2607
2608 void axis_paint(
2609     image_desc_t *im)
2610 {
2611     /* draw x and y axis */
2612     /* gfx_line ( im->canvas, im->xorigin+im->xsize,im->yorigin,
2613        im->xorigin+im->xsize,im->yorigin-im->ysize,
2614        GRIDWIDTH, im->graph_col[GRC_AXIS]);
2615
2616        gfx_line ( im->canvas, im->xorigin,im->yorigin-im->ysize,
2617        im->xorigin+im->xsize,im->yorigin-im->ysize,
2618        GRIDWIDTH, im->graph_col[GRC_AXIS]); */
2619
2620     gfx_line(im, im->xorigin - 4,
2621              im->yorigin,
2622              im->xorigin + im->xsize +
2623              4, im->yorigin, MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2624     gfx_line(im, im->xorigin,
2625              im->yorigin + 4,
2626              im->xorigin,
2627              im->yorigin - im->ysize -
2628              4, MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2629     /* arrow for X and Y axis direction */
2630     gfx_new_area(im, im->xorigin + im->xsize + 2, im->yorigin - 3, im->xorigin + im->xsize + 2, im->yorigin + 3, im->xorigin + im->xsize + 7, im->yorigin,  /* horyzontal */
2631                  im->graph_col[GRC_ARROW]);
2632     gfx_close_path(im);
2633     gfx_new_area(im, im->xorigin - 3, im->yorigin - im->ysize - 2, im->xorigin + 3, im->yorigin - im->ysize - 2, im->xorigin, im->yorigin - im->ysize - 7,  /* vertical */
2634                  im->graph_col[GRC_ARROW]);
2635     gfx_close_path(im);
2636     if (im->second_axis_scale != 0){
2637        gfx_line ( im, im->xorigin+im->xsize,im->yorigin+4,
2638                          im->xorigin+im->xsize,im->yorigin-im->ysize-4,
2639                          MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2640        gfx_new_area ( im,
2641                    im->xorigin+im->xsize-2,  im->yorigin-im->ysize-2,
2642                    im->xorigin+im->xsize+3,  im->yorigin-im->ysize-2,
2643                    im->xorigin+im->xsize,    im->yorigin-im->ysize-7, /* LINEOFFSET */
2644                    im->graph_col[GRC_ARROW]);
2645        gfx_close_path(im);
2646     }
2647
2648 }
2649
2650 void grid_paint(
2651     image_desc_t *im)
2652 {
2653     long      i;
2654     int       res = 0;
2655     double    X0, Y0;   /* points for filled graph and more */
2656     struct gfx_color_t water_color;
2657
2658     if (im->draw_3d_border > 0) {
2659             /* draw 3d border */
2660             i = im->draw_3d_border;
2661             gfx_new_area(im, 0, im->yimg,
2662                          i, im->yimg - i, i, i, im->graph_col[GRC_SHADEA]);
2663             gfx_add_point(im, im->ximg - i, i);
2664             gfx_add_point(im, im->ximg, 0);
2665             gfx_add_point(im, 0, 0);
2666             gfx_close_path(im);
2667             gfx_new_area(im, i, im->yimg - i,
2668                          im->ximg - i,
2669                          im->yimg - i, im->ximg - i, i, im->graph_col[GRC_SHADEB]);
2670             gfx_add_point(im, im->ximg, 0);
2671             gfx_add_point(im, im->ximg, im->yimg);
2672             gfx_add_point(im, 0, im->yimg);
2673             gfx_close_path(im);
2674     }
2675     if (im->draw_x_grid == 1)
2676         vertical_grid(im);
2677     if (im->draw_y_grid == 1) {
2678         if (im->logarithmic) {
2679             res = horizontal_log_grid(im);
2680         } else {
2681             res = draw_horizontal_grid(im);
2682         }
2683
2684         /* dont draw horizontal grid if there is no min and max val */
2685         if (!res) {
2686             char     *nodata = "No Data found";
2687
2688             gfx_text(im, im->ximg / 2,
2689                      (2 * im->yorigin -
2690                       im->ysize) / 2,
2691                      im->graph_col[GRC_FONT],
2692                      im->
2693                      text_prop[TEXT_PROP_AXIS].
2694                      font_desc,
2695                      im->tabwidth, 0.0,
2696                      GFX_H_CENTER, GFX_V_CENTER, nodata);
2697         }
2698     }
2699
2700     /* yaxis unit description */
2701     if (im->ylegend[0] != '\0'){
2702         gfx_text(im,
2703                  im->xOriginLegendY+10,
2704                  im->yOriginLegendY,
2705                  im->graph_col[GRC_FONT],
2706                  im->
2707                  text_prop[TEXT_PROP_UNIT].
2708                  font_desc,
2709                  im->tabwidth,
2710                  RRDGRAPH_YLEGEND_ANGLE, GFX_H_CENTER, GFX_V_CENTER, im->ylegend);
2711
2712     }
2713     if (im->second_axis_legend[0] != '\0'){
2714             gfx_text( im,
2715                   im->xOriginLegendY2+10,
2716                   im->yOriginLegendY2,
2717                   im->graph_col[GRC_FONT],
2718                   im->text_prop[TEXT_PROP_UNIT].font_desc,
2719                   im->tabwidth,
2720                   RRDGRAPH_YLEGEND_ANGLE,
2721                   GFX_H_CENTER, GFX_V_CENTER,
2722                   im->second_axis_legend);
2723     }
2724
2725     /* graph title */
2726     gfx_text(im,
2727              im->xOriginTitle, im->yOriginTitle+6,
2728              im->graph_col[GRC_FONT],
2729              im->
2730              text_prop[TEXT_PROP_TITLE].
2731              font_desc,
2732              im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_TOP, im->title);
2733     /* rrdtool 'logo' */
2734     if (!(im->extra_flags & NO_RRDTOOL_TAG)){
2735         water_color = im->graph_col[GRC_FONT];
2736         water_color.alpha = 0.3;
2737         double xpos = im->legendposition == EAST ? im->xOriginLegendY : im->ximg - 4;
2738         gfx_text(im, xpos, 5,
2739                  water_color,
2740                  im->
2741                  text_prop[TEXT_PROP_WATERMARK].
2742                  font_desc, im->tabwidth,
2743                  -90, GFX_H_LEFT, GFX_V_TOP, "RRDTOOL / TOBI OETIKER");
2744     }
2745     /* graph watermark */
2746     if (im->watermark[0] != '\0') {
2747         water_color = im->graph_col[GRC_FONT];
2748         water_color.alpha = 0.3;
2749         gfx_text(im,
2750                  im->ximg / 2, im->yimg - 6,
2751                  water_color,
2752                  im->
2753                  text_prop[TEXT_PROP_WATERMARK].
2754                  font_desc, im->tabwidth, 0,
2755                  GFX_H_CENTER, GFX_V_BOTTOM, im->watermark);
2756     }
2757
2758     /* graph labels */
2759     if (!(im->extra_flags & NOLEGEND) && !(im->extra_flags & ONLY_GRAPH)) {
2760         for (i = 0; i < im->gdes_c; i++) {
2761             if (im->gdes[i].legend[0] == '\0')
2762                 continue;
2763             /* im->gdes[i].leg_y is the bottom of the legend */
2764             X0 = im->xOriginLegend + im->gdes[i].leg_x;
2765             Y0 = im->legenddirection == TOP_DOWN ? im->yOriginLegend + im->gdes[i].leg_y : im->yOriginLegend + im->legendheight - im->gdes[i].leg_y;
2766             gfx_text(im, X0, Y0,
2767                      im->graph_col[GRC_FONT],
2768                      im->
2769                      text_prop
2770                      [TEXT_PROP_LEGEND].font_desc,
2771                      im->tabwidth, 0.0,
2772                      GFX_H_LEFT, GFX_V_BOTTOM, im->gdes[i].legend);
2773             /* The legend for GRAPH items starts with "M " to have
2774                enough space for the box */
2775             if (im->gdes[i].gf != GF_PRINT &&
2776                 im->gdes[i].gf != GF_GPRINT && im->gdes[i].gf != GF_COMMENT) {
2777                 double    boxH, boxV;
2778                 double    X1, Y1;
2779
2780                 boxH = gfx_get_text_width(im, 0,
2781                                           im->
2782                                           text_prop
2783                                           [TEXT_PROP_LEGEND].
2784                                           font_desc,
2785                                           im->tabwidth, "o") * 1.2;
2786                 boxV = boxH;
2787                 /* shift the box up a bit */
2788                 Y0 -= boxV * 0.4;
2789
2790         if (im->dynamic_labels && im->gdes[i].gf == GF_HRULE) { /* [-] */
2791                         cairo_save(im->cr);
2792                         cairo_new_path(im->cr);
2793                         cairo_set_line_width(im->cr, 1.0);
2794                         gfx_line(im,
2795                                 X0, Y0 - boxV / 2,
2796                                 X0 + boxH, Y0 - boxV / 2,
2797                                 1.0, im->gdes[i].col);
2798                         gfx_close_path(im);
2799                 } else if (im->dynamic_labels && im->gdes[i].gf == GF_VRULE) { /* [|] */
2800                         cairo_save(im->cr);
2801                         cairo_new_path(im->cr);
2802                         cairo_set_line_width(im->cr, 1.0);
2803                         gfx_line(im,
2804                                 X0 + boxH / 2, Y0,
2805                                 X0 + boxH / 2, Y0 - boxV,
2806                                 1.0, im->gdes[i].col);
2807                         gfx_close_path(im);
2808                 } else if (im->dynamic_labels && im->gdes[i].gf == GF_LINE) { /* [/] */
2809                         cairo_save(im->cr);
2810                         cairo_new_path(im->cr);
2811                         cairo_set_line_width(im->cr, im->gdes[i].linewidth);
2812                         gfx_line(im,
2813                                 X0, Y0,
2814                                 X0 + boxH, Y0 - boxV,
2815                                 im->gdes[i].linewidth, im->gdes[i].col);
2816                         gfx_close_path(im);
2817                 } else {
2818                 /* make sure transparent colors show up the same way as in the graph */
2819                         gfx_new_area(im,
2820                                      X0, Y0 - boxV,
2821                                      X0, Y0, X0 + boxH, Y0, im->graph_col[GRC_BACK]);
2822                         gfx_add_point(im, X0 + boxH, Y0 - boxV);
2823                         gfx_close_path(im);
2824                         gfx_new_area(im, X0, Y0 - boxV, X0,
2825                                      Y0, X0 + boxH, Y0, im->gdes[i].col);
2826                         gfx_add_point(im, X0 + boxH, Y0 - boxV);
2827                         gfx_close_path(im);
2828                         cairo_save(im->cr);
2829                         cairo_new_path(im->cr);
2830                         cairo_set_line_width(im->cr, 1.0);
2831                         X1 = X0 + boxH;
2832                         Y1 = Y0 - boxV;
2833                         gfx_line_fit(im, &X0, &Y0);
2834                         gfx_line_fit(im, &X1, &Y1);
2835                         cairo_move_to(im->cr, X0, Y0);
2836                         cairo_line_to(im->cr, X1, Y0);
2837                         cairo_line_to(im->cr, X1, Y1);
2838                         cairo_line_to(im->cr, X0, Y1);
2839                         cairo_close_path(im->cr);
2840                         cairo_set_source_rgba(im->cr,
2841                                               im->graph_col[GRC_FRAME].red,
2842                                               im->graph_col[GRC_FRAME].green,
2843                                               im->graph_col[GRC_FRAME].blue,
2844                                               im->graph_col[GRC_FRAME].alpha);
2845                 }
2846                 if (im->gdes[i].dash) {
2847                     /* make box borders in legend dashed if the graph is dashed */
2848                     double    dashes[] = {
2849                         3.0
2850                     };
2851                     cairo_set_dash(im->cr, dashes, 1, 0.0);
2852                 }
2853                 cairo_stroke(im->cr);
2854                 cairo_restore(im->cr);
2855             }
2856         }
2857     }
2858 }
2859
2860
2861 /*****************************************************
2862  * lazy check make sure we rely need to create this graph
2863  *****************************************************/
2864
2865 int lazy_check(
2866     image_desc_t *im)
2867 {
2868     FILE     *fd = NULL;
2869     int       size = 1;
2870     struct stat imgstat;
2871
2872     if (im->lazy == 0)
2873         return 0;       /* no lazy option */
2874     if (strlen(im->graphfile) == 0)
2875         return 0;       /* inmemory option */
2876     if (stat(im->graphfile, &imgstat) != 0)
2877         return 0;       /* can't stat */
2878     /* one pixel in the existing graph is more then what we would
2879        change here ... */
2880     if (time(NULL) - imgstat.st_mtime > (im->end - im->start) / im->xsize)
2881         return 0;
2882     if ((fd = fopen(im->graphfile, "rb")) == NULL)
2883         return 0;       /* the file does not exist */
2884     switch (im->imgformat) {
2885     case IF_PNG:
2886         size = PngSize(fd, &(im->ximg), &(im->yimg));
2887         break;
2888     default:
2889         size = 1;
2890     }
2891     fclose(fd);
2892     return size;
2893 }
2894
2895
2896 int graph_size_location(
2897     image_desc_t
2898     *im,
2899     int elements)
2900 {
2901     /* The actual size of the image to draw is determined from
2902      ** several sources.  The size given on the command line is
2903      ** the graph area but we need more as we have to draw labels
2904      ** and other things outside the graph area. If the option
2905      ** --full-size-mode is selected the size defines the total
2906      ** image size and the size available for the graph is
2907      ** calculated.
2908      */
2909
2910     /** +---+-----------------------------------+
2911      ** | y |...............graph title.........|
2912      ** |   +---+-------------------------------+
2913      ** | a | y |                               |
2914      ** | x |   |                               |
2915      ** | i | a |                               |
2916      ** | s | x |       main graph area         |
2917      ** |   | i |                               |
2918      ** | t | s |                               |
2919      ** | i |   |                               |
2920      ** | t | l |                               |
2921      ** | l | b +-------------------------------+
2922      ** | e | l |       x axis labels           |
2923      ** +---+---+-------------------------------+
2924      ** |....................legends............|
2925      ** +---------------------------------------+
2926      ** |                   watermark           |
2927      ** +---------------------------------------+
2928      */
2929
2930     int       Xvertical = 0, Xvertical2 = 0, Ytitle =
2931         0, Xylabel = 0, Xmain = 0, Ymain =
2932         0, Yxlabel = 0, Xspacing = 15, Yspacing = 15, Ywatermark = 4;
2933
2934     // no legends and no the shall be plotted it's easy
2935     if (im->extra_flags & ONLY_GRAPH) {
2936         im->xorigin = 0;
2937         im->ximg = im->xsize;
2938         im->yimg = im->ysize;
2939         im->yorigin = im->ysize;
2940         ytr(im, DNAN);
2941         return 0;
2942     }
2943
2944     if(im->watermark[0] != '\0') {
2945         Ywatermark = im->text_prop[TEXT_PROP_WATERMARK].size * 2;
2946     }
2947
2948     // calculate the width of the left vertical legend
2949     if (im->ylegend[0] != '\0') {
2950         Xvertical = im->text_prop[TEXT_PROP_UNIT].size * 2;
2951     }
2952
2953     // calculate the width of the right vertical legend
2954     if (im->second_axis_legend[0] != '\0') {
2955         Xvertical2 = im->text_prop[TEXT_PROP_UNIT].size * 2;
2956     }
2957     else{
2958         Xvertical2 = Xspacing;
2959     }
2960
2961     if (im->title[0] != '\0') {
2962         /* The title is placed "inbetween" two text lines so it
2963          ** automatically has some vertical spacing.  The horizontal
2964          ** spacing is added here, on each side.
2965          */
2966         /* if necessary, reduce the font size of the title until it fits the image width */
2967         Ytitle = im->text_prop[TEXT_PROP_TITLE].size * 2.6 + 10;
2968     }
2969     else{
2970         // we have no title; get a little clearing from the top
2971         Ytitle = Yspacing;
2972     }
2973
2974     if (elements) {
2975         if (im->draw_x_grid) {
2976             // calculate the height of the horizontal labelling
2977             Yxlabel = im->text_prop[TEXT_PROP_AXIS].size * 2.5;
2978         }
2979         if (im->draw_y_grid || im->forceleftspace) {
2980             // calculate the width of the vertical labelling
2981             Xylabel =
2982                 gfx_get_text_width(im, 0,
2983                                    im->text_prop[TEXT_PROP_AXIS].font_desc,
2984                                    im->tabwidth, "0") * im->unitslength;
2985         }
2986     }
2987
2988     // add some space to the labelling
2989     Xylabel += Xspacing;
2990
2991     /* If the legend is printed besides the graph the width has to be
2992      ** calculated first. Placing the legend north or south of the
2993      ** graph requires the width calculation first, so the legend is
2994      ** skipped for the moment.
2995      */
2996     im->legendheight = 0;
2997     im->legendwidth = 0;
2998     if (!(im->extra_flags & NOLEGEND)) {
2999         if(im->legendposition == WEST || im->legendposition == EAST){
3000             if (leg_place(im, 1) == -1){
3001                 return -1;
3002             }
3003         }
3004     }
3005
3006     if (im->extra_flags & FULL_SIZE_MODE) {
3007
3008         /* The actual size of the image to draw has been determined by the user.
3009          ** The graph area is the space remaining after accounting for the legend,
3010          ** the watermark, the axis labels, and the title.
3011          */
3012         im->ximg = im->xsize;
3013         im->yimg = im->ysize;
3014         Xmain = im->ximg;
3015         Ymain = im->yimg;
3016
3017         /* Now calculate the total size.  Insert some spacing where
3018            desired.  im->xorigin and im->yorigin need to correspond
3019            with the lower left corner of the main graph area or, if
3020            this one is not set, the imaginary box surrounding the
3021            pie chart area. */
3022         /* Initial size calculation for the main graph area */
3023
3024         Xmain -= Xylabel;// + Xspacing;
3025         if((im->legendposition == WEST || im->legendposition == EAST) && !(im->extra_flags & NOLEGEND) ){
3026             Xmain -= im->legendwidth;// + Xspacing;
3027         }
3028         if (im->second_axis_scale != 0){
3029             Xmain -= Xylabel;
3030         }
3031         if (!(im->extra_flags & NO_RRDTOOL_TAG)){
3032             Xmain -= Xspacing;
3033         }
3034
3035         Xmain -= Xvertical + Xvertical2;
3036
3037         /* limit the remaining space to 0 */
3038         if(Xmain < 1){
3039             Xmain = 1;
3040         }
3041         im->xsize = Xmain;
3042
3043         /* Putting the legend north or south, the height can now be calculated */
3044         if (!(im->extra_flags & NOLEGEND)) {
3045             if(im->legendposition == NORTH || im->legendposition == SOUTH){
3046                 im->legendwidth = im->ximg;
3047                 if (leg_place(im, 0) == -1){
3048                     return -1;
3049                 }
3050             }
3051         }
3052
3053         if( (im->legendposition == NORTH || im->legendposition == SOUTH)  && !(im->extra_flags & NOLEGEND) ){
3054             Ymain -=  Yxlabel + im->legendheight;
3055         }
3056         else{
3057             Ymain -= Yxlabel;
3058         }
3059
3060         /* reserve space for the title *or* some padding above the graph */
3061         Ymain -= Ytitle;
3062
3063             /* reserve space for padding below the graph */
3064         if (im->extra_flags & NOLEGEND) {
3065             Ymain -= 0.5*Yspacing;
3066         }
3067
3068         if (im->watermark[0] != '\0') {
3069             Ymain -= Ywatermark;
3070         }
3071         /* limit the remaining height to 0 */
3072         if(Ymain < 1){
3073             Ymain = 1;
3074         }
3075         im->ysize = Ymain;
3076     } else {            /* dimension options -width and -height refer to the dimensions of the main graph area */
3077
3078         /* The actual size of the image to draw is determined from
3079          ** several sources.  The size given on the command line is
3080          ** the graph area but we need more as we have to draw labels
3081          ** and other things outside the graph area.
3082          */
3083
3084         if (elements) {
3085             Xmain = im->xsize; // + Xspacing;
3086             Ymain = im->ysize;
3087         }
3088
3089         im->ximg = Xmain + Xylabel;
3090         if (!(im->extra_flags & NO_RRDTOOL_TAG)){
3091             im->ximg += Xspacing;
3092         }
3093
3094         if( (im->legendposition == WEST || im->legendposition == EAST) && !(im->extra_flags & NOLEGEND) ){
3095             im->ximg += im->legendwidth;// + Xspacing;
3096         }
3097         if (im->second_axis_scale != 0){
3098             im->ximg += Xylabel;
3099         }
3100
3101         im->ximg += Xvertical + Xvertical2;
3102
3103         if (!(im->extra_flags & NOLEGEND)) {
3104             if(im->legendposition == NORTH || im->legendposition == SOUTH){
3105                 im->legendwidth = im->ximg;
3106                 if (leg_place(im, 0) == -1){
3107                     return -1;
3108                 }
3109             }
3110         }
3111
3112         im->yimg = Ymain + Yxlabel;
3113         if( (im->legendposition == NORTH || im->legendposition == SOUTH)  && !(im->extra_flags & NOLEGEND) ){
3114              im->yimg += im->legendheight;
3115         }
3116
3117         /* reserve space for the title *or* some padding above the graph */
3118         if (Ytitle) {
3119             im->yimg += Ytitle;
3120         } else {
3121             im->yimg += 1.5 * Yspacing;
3122         }
3123         /* reserve space for padding below the graph */
3124         if (im->extra_flags & NOLEGEND) {
3125             im->yimg += 0.5*Yspacing;
3126         }
3127
3128         if (im->watermark[0] != '\0') {
3129             im->yimg += Ywatermark;
3130         }
3131     }
3132
3133
3134     /* In case of putting the legend in west or east position the first
3135      ** legend calculation might lead to wrong positions if some items
3136      ** are not aligned on the left hand side (e.g. centered) as the
3137      ** legendwidth wight have been increased after the item was placed.
3138      ** In this case the positions have to be recalculated.
3139      */
3140     if (!(im->extra_flags & NOLEGEND)) {
3141         if(im->legendposition == WEST || im->legendposition == EAST){
3142             if (leg_place(im, 0) == -1){
3143                 return -1;
3144             }
3145         }
3146     }
3147
3148     /* After calculating all dimensions
3149      ** it is now possible to calculate
3150      ** all offsets.
3151      */
3152     switch(im->legendposition){
3153         case NORTH:
3154             im->xOriginTitle   = (im->ximg / 2);
3155             im->yOriginTitle   = 0;
3156
3157             im->xOriginLegend  = 0;
3158             im->yOriginLegend  = Ytitle;
3159
3160             im->xOriginLegendY = 0;
3161             im->yOriginLegendY = Ytitle + im->legendheight + (Ymain / 2) + Yxlabel;
3162
3163             im->xorigin        = Xvertical + Xylabel;
3164             im->yorigin        = Ytitle + im->legendheight + Ymain;
3165
3166             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3167             if (im->second_axis_scale != 0){
3168                 im->xOriginLegendY2 += Xylabel;
3169             }
3170             im->yOriginLegendY2 = Ytitle + im->legendheight + (Ymain / 2) + Yxlabel;
3171
3172             break;
3173
3174         case WEST:
3175             im->xOriginTitle   = im->legendwidth + im->xsize / 2;
3176             im->yOriginTitle   = 0;
3177
3178             im->xOriginLegend  = 0;
3179             im->yOriginLegend  = Ytitle;
3180
3181             im->xOriginLegendY = im->legendwidth;
3182             im->yOriginLegendY = Ytitle + (Ymain / 2);
3183
3184             im->xorigin        = im->legendwidth + Xvertical + Xylabel;
3185             im->yorigin        = Ytitle + Ymain;
3186
3187             im->xOriginLegendY2 = im->legendwidth + Xvertical + Xylabel + Xmain;
3188             if (im->second_axis_scale != 0){
3189                 im->xOriginLegendY2 += Xylabel;
3190             }
3191             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3192
3193             break;
3194
3195         case SOUTH:
3196             im->xOriginTitle   = im->ximg / 2;
3197             im->yOriginTitle   = 0;
3198
3199             im->xOriginLegend  = 0;
3200             im->yOriginLegend  = Ytitle + Ymain + Yxlabel;
3201
3202             im->xOriginLegendY = 0;
3203             im->yOriginLegendY = Ytitle + (Ymain / 2);
3204
3205             im->xorigin        = Xvertical + Xylabel;
3206             im->yorigin        = Ytitle + Ymain;
3207
3208             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3209             if (im->second_axis_scale != 0){
3210                 im->xOriginLegendY2 += Xylabel;
3211             }
3212             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3213
3214             break;
3215
3216         case EAST:
3217             im->xOriginTitle   = im->xsize / 2;
3218             im->yOriginTitle   = 0;
3219
3220             im->xOriginLegend  = Xvertical + Xylabel + Xmain + Xvertical2;
3221             if (im->second_axis_scale != 0){
3222                 im->xOriginLegend += Xylabel;
3223             }
3224             im->yOriginLegend  = Ytitle;
3225
3226             im->xOriginLegendY = 0;
3227             im->yOriginLegendY = Ytitle + (Ymain / 2);
3228
3229             im->xorigin        = Xvertical + Xylabel;
3230             im->yorigin        = Ytitle + Ymain;
3231
3232             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3233             if (im->second_axis_scale != 0){
3234                 im->xOriginLegendY2 += Xylabel;
3235             }
3236             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3237
3238             if (!(im->extra_flags & NO_RRDTOOL_TAG)){
3239                 im->xOriginTitle    += Xspacing;
3240                 im->xOriginLegend   += Xspacing;
3241                 im->xOriginLegendY  += Xspacing;
3242                 im->xorigin         += Xspacing;
3243                 im->xOriginLegendY2 += Xspacing;
3244             }
3245             break;
3246     }
3247
3248     xtr(im, 0);
3249     ytr(im, DNAN);
3250     return 0;
3251 }
3252
3253 static cairo_status_t cairo_output(
3254     void *closure,
3255     const unsigned char
3256     *data,
3257     unsigned int length)
3258 {
3259     image_desc_t *im = (image_desc_t*)closure;
3260
3261     im->rendered_image =
3262         (unsigned char*)realloc(im->rendered_image, im->rendered_image_size + length);
3263     if (im->rendered_image == NULL)
3264         return CAIRO_STATUS_WRITE_ERROR;
3265     memcpy(im->rendered_image + im->rendered_image_size, data, length);
3266     im->rendered_image_size += length;
3267     return CAIRO_STATUS_SUCCESS;
3268 }
3269
3270 /* draw that picture thing ... */
3271 int graph_paint(
3272     image_desc_t *im)
3273 {
3274     int       i, ii;
3275     int       lazy = lazy_check(im);
3276     double    areazero = 0.0;
3277     graph_desc_t *lastgdes = NULL;
3278     rrd_infoval_t info;
3279
3280 //    PangoFontMap *font_map = pango_cairo_font_map_get_default();
3281
3282     /* pull the data from the rrd files ... */
3283     if (data_fetch(im) == -1)
3284         return -1;
3285     /* evaluate VDEF and CDEF operations ... */
3286     if (data_calc(im) == -1)
3287         return -1;
3288     /* calculate and PRINT and GPRINT definitions. We have to do it at
3289      * this point because it will affect the length of the legends
3290      * if there are no graph elements (i==0) we stop here ...
3291      * if we are lazy, try to quit ...
3292      */
3293     i = print_calc(im);
3294     if (i < 0)
3295         return -1;
3296
3297     /* if we want and can be lazy ... quit now */
3298     if (i == 0)
3299         return 0;
3300
3301 /**************************************************************
3302  *** Calculating sizes and locations became a bit confusing ***
3303  *** so I moved this into a separate function.              ***
3304  **************************************************************/
3305     if (graph_size_location(im, i) == -1)
3306         return -1;
3307
3308     info.u_cnt = im->xorigin;
3309     grinfo_push(im, sprintf_alloc("graph_left"), RD_I_CNT, info);
3310     info.u_cnt = im->yorigin - im->ysize;
3311     grinfo_push(im, sprintf_alloc("graph_top"), RD_I_CNT, info);
3312     info.u_cnt = im->xsize;
3313     grinfo_push(im, sprintf_alloc("graph_width"), RD_I_CNT, info);
3314     info.u_cnt = im->ysize;
3315     grinfo_push(im, sprintf_alloc("graph_height"), RD_I_CNT, info);
3316     info.u_cnt = im->ximg;
3317     grinfo_push(im, sprintf_alloc("image_width"), RD_I_CNT, info);
3318     info.u_cnt = im->yimg;
3319     grinfo_push(im, sprintf_alloc("image_height"), RD_I_CNT, info);
3320     info.u_cnt = im->start;
3321     grinfo_push(im, sprintf_alloc("graph_start"), RD_I_CNT, info);
3322     info.u_cnt = im->end;
3323     grinfo_push(im, sprintf_alloc("graph_end"), RD_I_CNT, info);
3324
3325     /* if we want and can be lazy ... quit now */
3326     if (lazy)
3327         return 0;
3328
3329     /* get actual drawing data and find min and max values */
3330     if (data_proc(im) == -1)
3331         return -1;
3332     if (!im->logarithmic) {
3333         si_unit(im);
3334     }
3335
3336     /* identify si magnitude Kilo, Mega Giga ? */
3337     if (!im->rigid && !im->logarithmic)
3338         expand_range(im);   /* make sure the upper and lower limit are
3339                                sensible values */
3340
3341     info.u_val = im->minval;
3342     grinfo_push(im, sprintf_alloc("value_min"), RD_I_VAL, info);
3343     info.u_val = im->maxval;
3344     grinfo_push(im, sprintf_alloc("value_max"), RD_I_VAL, info);
3345
3346
3347     if (!calc_horizontal_grid(im))
3348         return -1;
3349     /* reset precalc */
3350     ytr(im, DNAN);
3351 /*   if (im->gridfit)
3352      apply_gridfit(im); */
3353     /* the actual graph is created by going through the individual
3354        graph elements and then drawing them */
3355     cairo_surface_destroy(im->surface);
3356     switch (im->imgformat) {
3357     case IF_PNG:
3358         im->surface =
3359             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
3360                                        im->ximg * im->zoom,
3361                                        im->yimg * im->zoom);
3362         break;
3363     case IF_PDF:
3364         im->gridfit = 0;
3365         im->surface = strlen(im->graphfile)
3366             ? cairo_pdf_surface_create(im->graphfile, im->ximg * im->zoom,
3367                                        im->yimg * im->zoom)
3368             : cairo_pdf_surface_create_for_stream
3369             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3370         break;
3371     case IF_EPS:
3372         im->gridfit = 0;
3373         im->surface = strlen(im->graphfile)
3374             ?
3375             cairo_ps_surface_create(im->graphfile, im->ximg * im->zoom,
3376                                     im->yimg * im->zoom)
3377             : cairo_ps_surface_create_for_stream
3378             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3379         break;
3380     case IF_SVG:
3381         im->gridfit = 0;
3382         im->surface = strlen(im->graphfile)
3383             ?
3384             cairo_svg_surface_create(im->
3385                                      graphfile,
3386                                      im->ximg * im->zoom, im->yimg * im->zoom)
3387             : cairo_svg_surface_create_for_stream
3388             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3389         cairo_svg_surface_restrict_to_version
3390             (im->surface, CAIRO_SVG_VERSION_1_1);
3391         break;
3392     };
3393     cairo_destroy(im->cr);
3394     im->cr = cairo_create(im->surface);
3395     cairo_set_antialias(im->cr, im->graph_antialias);
3396     cairo_scale(im->cr, im->zoom, im->zoom);
3397 //    pango_cairo_font_map_set_resolution(PANGO_CAIRO_FONT_MAP(font_map), 100);
3398     gfx_new_area(im, 0, 0, 0, im->yimg,
3399                  im->ximg, im->yimg, im->graph_col[GRC_BACK]);
3400     gfx_add_point(im, im->ximg, 0);
3401     gfx_close_path(im);
3402     gfx_new_area(im, im->xorigin,
3403                  im->yorigin,
3404                  im->xorigin +
3405                  im->xsize, im->yorigin,
3406                  im->xorigin +
3407                  im->xsize,
3408                  im->yorigin - im->ysize, im->graph_col[GRC_CANVAS]);
3409     gfx_add_point(im, im->xorigin, im->yorigin - im->ysize);
3410     gfx_close_path(im);
3411     cairo_rectangle(im->cr, im->xorigin, im->yorigin - im->ysize - 1.0,
3412                     im->xsize, im->ysize + 2.0);
3413     cairo_clip(im->cr);
3414     if (im->minval > 0.0)
3415         areazero = im->minval;
3416     if (im->maxval < 0.0)
3417         areazero = im->maxval;
3418     for (i = 0; i < im->gdes_c; i++) {
3419         switch (im->gdes[i].gf) {
3420         case GF_CDEF:
3421         case GF_VDEF:
3422         case GF_DEF:
3423         case GF_PRINT:
3424         case GF_GPRINT:
3425         case GF_COMMENT:
3426         case GF_TEXTALIGN:
3427         case GF_HRULE:
3428         case GF_VRULE:
3429         case GF_XPORT:
3430         case GF_SHIFT:
3431             break;
3432         case GF_TICK:
3433             for (ii = 0; ii < im->xsize; ii++) {
3434                 if (!isnan(im->gdes[i].p_data[ii])
3435                     && im->gdes[i].p_data[ii] != 0.0) {
3436                     if (im->gdes[i].yrule > 0) {
3437                         gfx_line(im,
3438                                  im->xorigin + ii,
3439                                  im->yorigin + 1.0,
3440                                  im->xorigin + ii,
3441                                  im->yorigin -
3442                                  im->gdes[i].yrule *
3443                                  im->ysize, 1.0, im->gdes[i].col);
3444                     } else if (im->gdes[i].yrule < 0) {
3445                         gfx_line(im,
3446                                  im->xorigin + ii,
3447                                  im->yorigin - im->ysize - 1.0,
3448                                  im->xorigin + ii,
3449                                  im->yorigin - im->ysize -
3450                                                 im->gdes[i].
3451                                                 yrule *
3452                                  im->ysize, 1.0, im->gdes[i].col);
3453                     }
3454                 }
3455             }
3456             break;
3457         case GF_LINE:
3458         case GF_AREA:
3459         case GF_GRAD: {
3460             rrd_value_t diffval = im->maxval - im->minval;
3461             rrd_value_t maxlimit = im->maxval + 9 * diffval;
3462             rrd_value_t minlimit = im->minval - 9 * diffval;
3463             for (ii = 0; ii < im->xsize; ii++) {
3464                 /* fix data points at oo and -oo */
3465                 if (isinf(im->gdes[i].p_data[ii])) {
3466                     if (im->gdes[i].p_data[ii] > 0) {
3467                         im->gdes[i].p_data[ii] = im->maxval;
3468                     } else {
3469                         im->gdes[i].p_data[ii] = im->minval;
3470                     }
3471                 }
3472                 /* some versions of cairo go unstable when trying
3473                    to draw way out of the canvas ... lets not even try */
3474                if (im->gdes[i].p_data[ii] > maxlimit) {
3475                    im->gdes[i].p_data[ii] = maxlimit;
3476                }
3477                if (im->gdes[i].p_data[ii] < minlimit) {
3478                    im->gdes[i].p_data[ii] = minlimit;
3479                }
3480             }           /* for */
3481
3482             /* *******************************************************
3483                a           ___. (a,t)
3484                |   |    ___
3485                ____|   |   |   |
3486                |       |___|
3487                -------|--t-1--t--------------------------------
3488
3489                if we know the value at time t was a then
3490                we draw a square from t-1 to t with the value a.
3491
3492                ********************************************************* */
3493             if (im->gdes[i].col.alpha != 0.0) {
3494                 /* GF_LINE and friend */
3495                 if (im->gdes[i].gf == GF_LINE) {
3496                     double    last_y = 0.0;
3497                     int       draw_on = 0;
3498
3499                     cairo_save(im->cr);
3500                     cairo_new_path(im->cr);
3501                     cairo_set_line_width(im->cr, im->gdes[i].linewidth);
3502                     if (im->gdes[i].dash) {
3503                         cairo_set_dash(im->cr,
3504                                        im->gdes[i].p_dashes,
3505                                        im->gdes[i].ndash, im->gdes[i].offset);
3506                     }
3507
3508                     for (ii = 1; ii < im->xsize; ii++) {
3509                         if (isnan(im->gdes[i].p_data[ii])
3510                             || (im->slopemode == 1
3511                                 && isnan(im->gdes[i].p_data[ii - 1]))) {
3512                             draw_on = 0;
3513                             continue;
3514                         }
3515                         if (draw_on == 0) {
3516                             last_y = ytr(im, im->gdes[i].p_data[ii]);
3517                             if (im->slopemode == 0) {
3518                                 double    x = ii - 1 + im->xorigin;
3519                                 double    y = last_y;
3520
3521                                 gfx_line_fit(im, &x, &y);
3522                                 cairo_move_to(im->cr, x, y);
3523                                 x = ii + im->xorigin;
3524                                 y = last_y;
3525                                 gfx_line_fit(im, &x, &y);
3526                                 cairo_line_to(im->cr, x, y);
3527                             } else {
3528                                 double    x = ii - 1 + im->xorigin;
3529                                 double    y =
3530                                     ytr(im, im->gdes[i].p_data[ii - 1]);
3531                                 gfx_line_fit(im, &x, &y);
3532                                 cairo_move_to(im->cr, x, y);
3533                                 x = ii + im->xorigin;
3534                                 y = last_y;
3535                                 gfx_line_fit(im, &x, &y);
3536                                 cairo_line_to(im->cr, x, y);
3537                             }
3538                             draw_on = 1;
3539                         } else {
3540                             double    x1 = ii + im->xorigin;
3541                             double    y1 = ytr(im, im->gdes[i].p_data[ii]);
3542
3543                             if (im->slopemode == 0
3544                                 && !AlmostEqual2sComplement(y1, last_y, 4)) {
3545                                 double    x = ii - 1 + im->xorigin;
3546                                 double    y = y1;
3547
3548                                 gfx_line_fit(im, &x, &y);
3549                                 cairo_line_to(im->cr, x, y);
3550                             };
3551                             last_y = y1;
3552                             gfx_line_fit(im, &x1, &y1);
3553                             cairo_line_to(im->cr, x1, y1);
3554                         };
3555                     }
3556                     cairo_set_source_rgba(im->cr,
3557                                           im->gdes[i].
3558                                           col.red,
3559                                           im->gdes[i].
3560                                           col.green,
3561                                           im->gdes[i].
3562                                           col.blue, im->gdes[i].col.alpha);
3563                     cairo_set_line_cap(im->cr, CAIRO_LINE_CAP_ROUND);
3564                     cairo_set_line_join(im->cr, CAIRO_LINE_JOIN_ROUND);
3565                     cairo_stroke(im->cr);
3566                     cairo_restore(im->cr);
3567                 } else {
3568                                         double lastx=0;
3569                                         double lasty=0;
3570                     int       idxI = -1;
3571                     double   *foreY =
3572                         (double *) malloc(sizeof(double) * im->xsize * 2);
3573                     double   *foreX =
3574                         (double *) malloc(sizeof(double) * im->xsize * 2);
3575                     double   *backY =
3576                         (double *) malloc(sizeof(double) * im->xsize * 2);
3577                     double   *backX =
3578                         (double *) malloc(sizeof(double) * im->xsize * 2);
3579                     int       drawem = 0;
3580
3581                     for (ii = 0; ii <= im->xsize; ii++) {
3582                         double    ybase, ytop;
3583
3584                         if (idxI > 0 && (drawem != 0 || ii == im->xsize)) {
3585                             int       cntI = 1;
3586                             int       lastI = 0;
3587
3588                             while (cntI < idxI
3589                                    &&
3590                                    AlmostEqual2sComplement(foreY
3591                                                            [lastI],
3592                                                            foreY[cntI], 4)
3593                                    &&
3594                                    AlmostEqual2sComplement(foreY
3595                                                            [lastI],
3596                                                            foreY
3597                                                            [cntI + 1], 4)) {
3598                                 cntI++;
3599                             }
3600                                                         if (im->gdes[i].gf != GF_GRAD) {
3601                                 gfx_new_area(im,
3602                                              backX[0], backY[0],
3603                                              foreX[0], foreY[0],
3604                                              foreX[cntI],
3605                                              foreY[cntI], im->gdes[i].col);
3606                                                         } else {
3607                                                                 lastx = foreX[cntI];
3608                                                                 lasty = foreY[cntI];
3609                                                         }
3610                                                         while (cntI < idxI) {
3611                                 lastI = cntI;
3612                                 cntI++;
3613                                 while (cntI < idxI
3614                                        &&
3615                                        AlmostEqual2sComplement(foreY
3616                                                                [lastI],
3617                                                                foreY[cntI], 4)
3618                                        &&
3619                                        AlmostEqual2sComplement(foreY
3620                                                                [lastI],
3621                                                                foreY
3622                                                                [cntI
3623                                                                 + 1], 4)) {
3624                                     cntI++;
3625                                 }
3626                                                                 if (im->gdes[i].gf != GF_GRAD) {
3627                                         gfx_add_point(im, foreX[cntI], foreY[cntI]);
3628                                                                 } else {
3629                                                                         gfx_add_rect_fadey(im,
3630                                                                                 lastx, foreY[0],
3631                                                                                 foreX[cntI], foreY[cntI], lasty,
3632                                                                                 im->gdes[i].col,
3633                                                                                 im->gdes[i].col2,
3634                                                                                 im->gdes[i].gradheight
3635                                                                                 );
3636                                                                         lastx = foreX[cntI];
3637                                                                         lasty = foreY[cntI];
3638                                                                 }
3639                             }
3640                                                         if (im->gdes[i].gf != GF_GRAD) {
3641                                 gfx_add_point(im, backX[idxI], backY[idxI]);
3642                                                         } else {
3643                                                                 gfx_add_rect_fadey(im,
3644                                                                         lastx, foreY[0],
3645                                                                         backX[idxI], backY[idxI], lasty,
3646                                                                         im->gdes[i].col,
3647                                                                         im->gdes[i].col2,
3648                                                                         im->gdes[i].gradheight);
3649                                                                 lastx = backX[idxI];
3650                                                                 lasty = backY[idxI];
3651                                                         }
3652                             while (idxI > 1) {
3653                                 lastI = idxI;
3654                                 idxI--;
3655                                 while (idxI > 1
3656                                        &&
3657                                        AlmostEqual2sComplement(backY
3658                                                                [lastI],
3659                                                                backY[idxI], 4)
3660                                        &&
3661                                        AlmostEqual2sComplement(backY
3662                                                                [lastI],
3663                                                                backY
3664                                                                [idxI
3665                                                                 - 1], 4)) {
3666                                     idxI--;
3667                                 }
3668                                                                 if (im->gdes[i].gf != GF_GRAD) {
3669                                         gfx_add_point(im, backX[idxI], backY[idxI]);
3670                                                                 } else {
3671                                                                         gfx_add_rect_fadey(im,
3672                                                                                 lastx, foreY[0],
3673                                                                                 backX[idxI], backY[idxI], lasty,
3674                                                                                 im->gdes[i].col,
3675                                                                                 im->gdes[i].col2,
3676                                                                                 im->gdes[i].gradheight);
3677                                                                         lastx = backX[idxI];
3678                                                                         lasty = backY[idxI];
3679                                                                 }
3680                             }
3681                             idxI = -1;
3682                             drawem = 0;
3683                                                         if (im->gdes[i].gf != GF_GRAD)
3684                                     gfx_close_path(im);
3685                         }
3686                         if (drawem != 0) {
3687                             drawem = 0;
3688                             idxI = -1;
3689                         }
3690                         if (ii == im->xsize)
3691                             break;
3692                         if (im->slopemode == 0 && ii == 0) {
3693                             continue;
3694                         }
3695                         if (isnan(im->gdes[i].p_data[ii])) {
3696                             drawem = 1;
3697                             continue;
3698                         }
3699                         ytop = ytr(im, im->gdes[i].p_data[ii]);
3700                         if (lastgdes && im->gdes[i].stack) {
3701                             ybase = ytr(im, lastgdes->p_data[ii]);
3702                         } else {
3703                             ybase = ytr(im, areazero);
3704                         }
3705                         if (ybase == ytop) {
3706                             drawem = 1;
3707                             continue;
3708                         }
3709
3710                         if (ybase > ytop) {
3711                             double    extra = ytop;
3712
3713                             ytop = ybase;
3714                             ybase = extra;
3715                         }
3716                         if (im->slopemode == 0) {
3717                             backY[++idxI] = ybase - 0.2;
3718                             backX[idxI] = ii + im->xorigin - 1;
3719                             foreY[idxI] = ytop + 0.2;
3720                             foreX[idxI] = ii + im->xorigin - 1;
3721                         }
3722                         backY[++idxI] = ybase - 0.2;
3723                         backX[idxI] = ii + im->xorigin;
3724                         foreY[idxI] = ytop + 0.2;
3725                         foreX[idxI] = ii + im->xorigin;
3726                     }
3727                     /* close up any remaining area */
3728                     free(foreY);
3729                     free(foreX);
3730                     free(backY);
3731                     free(backX);
3732                 }       /* else GF_LINE */
3733             }
3734             /* if color != 0x0 */
3735             /* make sure we do not run into trouble when stacking on NaN */
3736             for (ii = 0; ii < im->xsize; ii++) {
3737                 if (isnan(im->gdes[i].p_data[ii])) {
3738                     if (lastgdes && (im->gdes[i].stack)) {
3739                         im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
3740                     } else {
3741                         im->gdes[i].p_data[ii] = areazero;
3742                     }
3743                 }
3744             }
3745             lastgdes = &(im->gdes[i]);
3746             break;
3747         } /* GF_AREA, GF_LINE, GF_GRAD */
3748         case GF_STACK:
3749             rrd_set_error
3750                 ("STACK should already be turned into LINE or AREA here");
3751             return -1;
3752             break;
3753         }               /* switch */
3754     }
3755     cairo_reset_clip(im->cr);
3756
3757     /* grid_paint also does the text */
3758     if (!(im->extra_flags & ONLY_GRAPH))
3759         grid_paint(im);
3760     if (!(im->extra_flags & ONLY_GRAPH))
3761         axis_paint(im);
3762     /* the RULES are the last thing to paint ... */
3763     for (i = 0; i < im->gdes_c; i++) {
3764
3765         switch (im->gdes[i].gf) {
3766         case GF_HRULE:
3767             if (im->gdes[i].yrule >= im->minval
3768                 && im->gdes[i].yrule <= im->maxval) {
3769                 cairo_save(im->cr);
3770                 if (im->gdes[i].dash) {
3771                     cairo_set_dash(im->cr,
3772                                    im->gdes[i].p_dashes,
3773                                    im->gdes[i].ndash, im->gdes[i].offset);
3774                 }
3775                 gfx_line(im, im->xorigin,
3776                          ytr(im, im->gdes[i].yrule),
3777                          im->xorigin + im->xsize,
3778                          ytr(im, im->gdes[i].yrule), 1.0, im->gdes[i].col);
3779                 cairo_stroke(im->cr);
3780                 cairo_restore(im->cr);
3781             }
3782             break;
3783         case GF_VRULE:
3784             if (im->gdes[i].xrule >= im->start
3785                 && im->gdes[i].xrule <= im->end) {
3786                 cairo_save(im->cr);
3787                 if (im->gdes[i].dash) {
3788                     cairo_set_dash(im->cr,
3789                                    im->gdes[i].p_dashes,
3790                                    im->gdes[i].ndash, im->gdes[i].offset);
3791                 }
3792                 gfx_line(im,
3793                          xtr(im, im->gdes[i].xrule),
3794                          im->yorigin, xtr(im,
3795                                           im->
3796                                           gdes[i].
3797                                           xrule),
3798                          im->yorigin - im->ysize, 1.0, im->gdes[i].col);
3799                 cairo_stroke(im->cr);
3800                 cairo_restore(im->cr);
3801             }
3802             break;
3803         default:
3804             break;
3805         }
3806     }
3807
3808
3809     switch (im->imgformat) {
3810     case IF_PNG:
3811     {
3812         cairo_status_t status;
3813
3814         status = strlen(im->graphfile) ?
3815             cairo_surface_write_to_png(im->surface, im->graphfile)
3816             : cairo_surface_write_to_png_stream(im->surface, &cairo_output,
3817                                                 im);
3818
3819         if (status != CAIRO_STATUS_SUCCESS) {
3820             rrd_set_error("Could not save png to '%s'", im->graphfile);
3821             return 1;
3822         }
3823         break;
3824     }
3825     default:
3826         if (strlen(im->graphfile)) {
3827             cairo_show_page(im->cr);
3828         } else {
3829             cairo_surface_finish(im->surface);
3830         }
3831         break;
3832     }
3833
3834     return 0;
3835 }
3836
3837
3838 /*****************************************************
3839  * graph stuff
3840  *****************************************************/
3841
3842 int gdes_alloc(
3843     image_desc_t *im)
3844 {
3845
3846     im->gdes_c++;
3847     if ((im->gdes = (graph_desc_t *)
3848          rrd_realloc(im->gdes, (im->gdes_c)
3849                      * sizeof(graph_desc_t))) == NULL) {
3850         rrd_set_error("realloc graph_descs");
3851         return -1;
3852     }
3853
3854
3855     im->gdes[im->gdes_c - 1].step = im->step;
3856     im->gdes[im->gdes_c - 1].step_orig = im->step;
3857     im->gdes[im->gdes_c - 1].stack = 0;
3858     im->gdes[im->gdes_c - 1].linewidth = 0;
3859     im->gdes[im->gdes_c - 1].debug = 0;
3860     im->gdes[im->gdes_c - 1].start = im->start;
3861     im->gdes[im->gdes_c - 1].start_orig = im->start;
3862     im->gdes[im->gdes_c - 1].end = im->end;
3863     im->gdes[im->gdes_c - 1].end_orig = im->end;
3864     im->gdes[im->gdes_c - 1].vname[0] = '\0';
3865     im->gdes[im->gdes_c - 1].data = NULL;
3866     im->gdes[im->gdes_c - 1].ds_namv = NULL;
3867     im->gdes[im->gdes_c - 1].data_first = 0;
3868     im->gdes[im->gdes_c - 1].p_data = NULL;
3869     im->gdes[im->gdes_c - 1].rpnp = NULL;
3870     im->gdes[im->gdes_c - 1].p_dashes = NULL;
3871     im->gdes[im->gdes_c - 1].shift = 0.0;
3872     im->gdes[im->gdes_c - 1].dash = 0;
3873     im->gdes[im->gdes_c - 1].ndash = 0;
3874     im->gdes[im->gdes_c - 1].offset = 0;
3875     im->gdes[im->gdes_c - 1].col.red = 0.0;
3876     im->gdes[im->gdes_c - 1].col.green = 0.0;
3877     im->gdes[im->gdes_c - 1].col.blue = 0.0;
3878     im->gdes[im->gdes_c - 1].col.alpha = 0.0;
3879     im->gdes[im->gdes_c - 1].col2.red = 0.0;
3880     im->gdes[im->gdes_c - 1].col2.green = 0.0;
3881     im->gdes[im->gdes_c - 1].col2.blue = 0.0;
3882     im->gdes[im->gdes_c - 1].col2.alpha = 0.0;
3883     im->gdes[im->gdes_c - 1].gradheight = 50.0;
3884     im->gdes[im->gdes_c - 1].legend[0] = '\0';
3885     im->gdes[im->gdes_c - 1].format[0] = '\0';
3886     im->gdes[im->gdes_c - 1].strftm = 0;
3887     im->gdes[im->gdes_c - 1].rrd[0] = '\0';
3888     im->gdes[im->gdes_c - 1].ds = -1;
3889     im->gdes[im->gdes_c - 1].cf_reduce = CF_AVERAGE;
3890     im->gdes[im->gdes_c - 1].cf = CF_AVERAGE;
3891     im->gdes[im->gdes_c - 1].yrule = DNAN;
3892     im->gdes[im->gdes_c - 1].xrule = 0;
3893     im->gdes[im->gdes_c - 1].daemon[0] = 0;
3894     return 0;
3895 }
3896
3897 /* copies input untill the first unescaped colon is found
3898    or until input ends. backslashes have to be escaped as well */
3899 int scan_for_col(
3900     const char *const input,
3901     int len,
3902     char *const output)
3903 {
3904     int       inp, outp = 0;
3905
3906     for (inp = 0; inp < len && input[inp] != ':' && input[inp] != '\0'; inp++) {
3907         if (input[inp] == '\\'
3908             && input[inp + 1] != '\0'
3909             && (input[inp + 1] == '\\' || input[inp + 1] == ':')) {
3910             output[outp++] = input[++inp];
3911         } else {
3912             output[outp++] = input[inp];
3913         }
3914     }
3915     output[outp] = '\0';
3916     return inp;
3917 }
3918
3919 /* Now just a wrapper around rrd_graph_v */
3920 int rrd_graph(
3921     int argc,
3922     char **argv,
3923     char ***prdata,
3924     int *xsize,
3925     int *ysize,
3926     FILE * stream,
3927     double *ymin,
3928     double *ymax)
3929 {
3930     int       prlines = 0;
3931     rrd_info_t *grinfo = NULL;
3932     rrd_info_t *walker;
3933
3934     grinfo = rrd_graph_v(argc, argv);
3935     if (grinfo == NULL)
3936         return -1;
3937     walker = grinfo;
3938     (*prdata) = NULL;
3939     while (walker) {
3940         if (strcmp(walker->key, "image_info") == 0) {
3941             prlines++;
3942             if (((*prdata) =
3943                  (char**)rrd_realloc((*prdata),
3944                              (prlines + 1) * sizeof(char *))) == NULL) {
3945                 rrd_set_error("realloc prdata");
3946                 return 0;
3947             }
3948             /* imginfo goes to position 0 in the prdata array */
3949             (*prdata)[prlines - 1] = (char*)malloc((strlen(walker->value.u_str)
3950                                              + 2) * sizeof(char));
3951             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3952             (*prdata)[prlines] = NULL;
3953         }
3954         /* skip anything else */
3955         walker = walker->next;
3956     }
3957     walker = grinfo;
3958     *xsize = 0;
3959     *ysize = 0;
3960     *ymin = 0;
3961     *ymax = 0;
3962     while (walker) {
3963         if (strcmp(walker->key, "image_width") == 0) {
3964             *xsize = walker->value.u_cnt;
3965         } else if (strcmp(walker->key, "image_height") == 0) {
3966             *ysize = walker->value.u_cnt;
3967         } else if (strcmp(walker->key, "value_min") == 0) {
3968             *ymin = walker->value.u_val;
3969         } else if (strcmp(walker->key, "value_max") == 0) {
3970             *ymax = walker->value.u_val;
3971         } else if (strncmp(walker->key, "print", 5) == 0) { /* keys are prdate[0..] */
3972             prlines++;
3973             if (((*prdata) =
3974                  (char**)rrd_realloc((*prdata),
3975                              (prlines + 1) * sizeof(char *))) == NULL) {
3976                 rrd_set_error("realloc prdata");
3977                 return 0;
3978             }
3979             (*prdata)[prlines - 1] = (char*)malloc((strlen(walker->value.u_str)
3980                                              + 2) * sizeof(char));
3981             (*prdata)[prlines] = NULL;
3982             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3983         } else if (strcmp(walker->key, "image") == 0) {
3984             if ( fwrite(walker->value.u_blo.ptr, walker->value.u_blo.size, 1,
3985                    (stream ? stream : stdout)) == 0 && ferror(stream ? stream : stdout)){
3986                 rrd_set_error("writing image");
3987                 return 0;
3988             }
3989         }
3990         /* skip anything else */
3991         walker = walker->next;
3992     }
3993     rrd_info_free(grinfo);
3994     return 0;
3995 }
3996
3997
3998 /* Some surgery done on this function, it became ridiculously big.
3999 ** Things moved:
4000 ** - initializing     now in rrd_graph_init()
4001 ** - options parsing  now in rrd_graph_options()
4002 ** - script parsing   now in rrd_graph_script()
4003 */
4004 rrd_info_t *rrd_graph_v(
4005     int argc,
4006     char **argv)
4007 {
4008     image_desc_t im;
4009     rrd_info_t *grinfo;
4010     char *old_locale;
4011     rrd_graph_init(&im);
4012     /* a dummy surface so that we can measure text sizes for placements */
4013     old_locale = setlocale(LC_NUMERIC, NULL);
4014     setlocale(LC_NUMERIC, "C");
4015     rrd_graph_options(argc, argv, &im);
4016     if (rrd_test_error()) {
4017         setlocale(LC_NUMERIC, old_locale); /* reenable locale */
4018         rrd_info_free(im.grinfo);
4019         im_free(&im);
4020         return NULL;
4021     }
4022
4023     if (optind >= argc) {
4024         setlocale(LC_NUMERIC, old_locale); /* reenable locale */
4025         rrd_info_free(im.grinfo);
4026         im_free(&im);
4027         rrd_set_error("missing filename");
4028         return NULL;
4029     }
4030
4031     if (strlen(argv[optind]) >= MAXPATH) {
4032         setlocale(LC_NUMERIC, old_locale); /* reenable locale */
4033         rrd_set_error("filename (including path) too long");
4034         rrd_info_free(im.grinfo);
4035         im_free(&im);
4036         return NULL;
4037     }
4038
4039     strncpy(im.graphfile, argv[optind], MAXPATH - 1);
4040     im.graphfile[MAXPATH - 1] = '\0';
4041
4042     if (strcmp(im.graphfile, "-") == 0) {
4043         im.graphfile[0] = '\0';
4044     }
4045
4046     rrd_graph_script(argc, argv, &im, 1);
4047     setlocale(LC_NUMERIC, old_locale); /* reenable locale for rendering the graph */
4048
4049     if (rrd_test_error()) {
4050         rrd_info_free(im.grinfo);
4051         im_free(&im);
4052         return NULL;
4053     }
4054
4055     /* Everything is now read and the actual work can start */
4056
4057     if (graph_paint(&im) == -1) {
4058         rrd_info_free(im.grinfo);
4059         im_free(&im);
4060         return NULL;
4061     }
4062
4063
4064     /* The image is generated and needs to be output.
4065      ** Also, if needed, print a line with information about the image.
4066      */
4067
4068     if (im.imginfo) {
4069         rrd_infoval_t info;
4070         char     *path;
4071         char     *filename;
4072
4073         path = strdup(im.graphfile);
4074         filename = basename(path);
4075         info.u_str =
4076             sprintf_alloc(im.imginfo,
4077                           filename,
4078                           (long) (im.zoom *
4079                                   im.ximg), (long) (im.zoom * im.yimg));
4080         grinfo_push(&im, sprintf_alloc("image_info"), RD_I_STR, info);
4081         free(info.u_str);
4082         free(path);
4083     }
4084     if (im.rendered_image) {
4085         rrd_infoval_t img;
4086
4087         img.u_blo.size = im.rendered_image_size;
4088         img.u_blo.ptr = im.rendered_image;
4089         grinfo_push(&im, sprintf_alloc("image"), RD_I_BLO, img);
4090     }
4091     grinfo = im.grinfo;
4092     im_free(&im);
4093     return grinfo;
4094 }
4095
4096 static void
4097 rrd_set_font_desc (
4098     image_desc_t *im,int prop,char *font, double size ){
4099     if (font){
4100         strncpy(im->text_prop[prop].font, font, sizeof(text_prop[prop].font) - 1);
4101         im->text_prop[prop].font[sizeof(text_prop[prop].font) - 1] = '\0';
4102         /* if we already got one, drop it first */
4103         pango_font_description_free(im->text_prop[prop].font_desc);
4104         im->text_prop[prop].font_desc = pango_font_description_from_string( font );
4105     };
4106     if (size > 0){
4107         im->text_prop[prop].size = size;
4108     };
4109     if (im->text_prop[prop].font_desc && im->text_prop[prop].size ){
4110         pango_font_description_set_size(im->text_prop[prop].font_desc, im->text_prop[prop].size * PANGO_SCALE);
4111     };
4112 }
4113
4114 void rrd_graph_init(
4115     image_desc_t
4116     *im)
4117 {
4118     unsigned int i;
4119     char     *deffont = getenv("RRD_DEFAULT_FONT");
4120     static PangoFontMap *fontmap = NULL;
4121     PangoContext *context;
4122
4123 #ifdef HAVE_TZSET
4124     tzset();
4125 #endif
4126
4127     im->base = 1000;
4128     im->daemon_addr = NULL;
4129     im->draw_x_grid = 1;
4130     im->draw_y_grid = 1;
4131     im->draw_3d_border = 2;
4132     im->dynamic_labels = 0;
4133     im->extra_flags = 0;
4134     im->font_options = cairo_font_options_create();
4135     im->forceleftspace = 0;
4136     im->gdes_c = 0;
4137     im->gdes = NULL;
4138     im->graph_antialias = CAIRO_ANTIALIAS_GRAY;
4139     im->grid_dash_off = 1;
4140     im->grid_dash_on = 1;
4141     im->gridfit = 1;
4142     im->grinfo = (rrd_info_t *) NULL;
4143     im->grinfo_current = (rrd_info_t *) NULL;
4144     im->imgformat = IF_PNG;
4145     im->imginfo = NULL;
4146     im->lazy = 0;
4147     im->legenddirection = TOP_DOWN;
4148     im->legendheight = 0;
4149     im->legendposition = SOUTH;
4150     im->legendwidth = 0;
4151     im->logarithmic = 0;
4152     im->maxval = DNAN;
4153     im->minval = 0;
4154     im->minval = DNAN;
4155     im->prt_c = 0;
4156     im->rigid = 0;
4157     im->rendered_image_size = 0;
4158     im->rendered_image = NULL;
4159     im->slopemode = 0;
4160     im->step = 0;
4161     im->symbol = ' ';
4162     im->tabwidth = 40.0;
4163     im->title[0] = '\0';
4164     im->unitsexponent = 9999;
4165     im->unitslength = 6;
4166     im->viewfactor = 1.0;
4167     im->watermark[0] = '\0';
4168     im->with_markup = 0;
4169     im->ximg = 0;
4170     im->xlab_user.minsec = -1;
4171     im->xorigin = 0;
4172     im->xOriginLegend = 0;
4173     im->xOriginLegendY = 0;
4174     im->xOriginLegendY2 = 0;
4175     im->xOriginTitle = 0;
4176     im->xsize = 400;
4177     im->ygridstep = DNAN;
4178     im->yimg = 0;
4179     im->ylegend[0] = '\0';
4180     im->second_axis_scale = 0; /* 0 disables it */
4181     im->second_axis_shift = 0; /* no shift by default */
4182     im->second_axis_legend[0] = '\0';
4183     im->second_axis_format[0] = '\0';
4184     im->yorigin = 0;
4185     im->yOriginLegend = 0;
4186     im->yOriginLegendY = 0;
4187     im->yOriginLegendY2 = 0;
4188     im->yOriginTitle = 0;
4189     im->ysize = 100;
4190     im->zoom = 1;
4191
4192     im->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 10, 10);
4193     im->cr = cairo_create(im->surface);
4194
4195     for (i = 0; i < DIM(text_prop); i++) {
4196         im->text_prop[i].size = -1;
4197         im->text_prop[i].font_desc = NULL;
4198         rrd_set_font_desc(im,i, deffont ? deffont : text_prop[i].font,text_prop[i].size);
4199     }
4200
4201     if (fontmap == NULL){
4202         fontmap = pango_cairo_font_map_get_default();
4203     }
4204
4205     context =  pango_cairo_font_map_create_context((PangoCairoFontMap*)fontmap);
4206
4207     pango_cairo_context_set_resolution(context, 100);
4208
4209     pango_cairo_update_context(im->cr,context);
4210
4211     im->layout = pango_layout_new(context);
4212     g_object_unref (context);
4213
4214 //  im->layout = pango_cairo_create_layout(im->cr);
4215
4216
4217     cairo_font_options_set_hint_style
4218         (im->font_options, CAIRO_HINT_STYLE_FULL);
4219     cairo_font_options_set_hint_metrics
4220         (im->font_options, CAIRO_HINT_METRICS_ON);
4221     cairo_font_options_set_antialias(im->font_options, CAIRO_ANTIALIAS_GRAY);
4222
4223
4224
4225     for (i = 0; i < DIM(graph_col); i++)
4226         im->graph_col[i] = graph_col[i];
4227
4228
4229 }
4230
4231
4232 void rrd_graph_options(
4233     int argc,
4234     char *argv[],
4235     image_desc_t
4236     *im)
4237 {
4238     int       stroff;
4239     char     *parsetime_error = NULL;
4240     char      scan_gtm[12], scan_mtm[12], scan_ltm[12], col_nam[12];
4241     time_t    start_tmp = 0, end_tmp = 0;
4242     long      long_tmp;
4243     rrd_time_value_t start_tv, end_tv;
4244     long unsigned int color;
4245
4246     /* defines for long options without a short equivalent. should be bytes,
4247        and may not collide with (the ASCII value of) short options */
4248 #define LONGOPT_UNITS_SI 255
4249
4250 /* *INDENT-OFF* */
4251     struct option long_options[] = {
4252         { "alt-autoscale",      no_argument,       0, 'A'},
4253         { "imgformat",          required_argument, 0, 'a'},
4254         { "font-smoothing-threshold", required_argument, 0, 'B'},
4255         { "base",               required_argument, 0, 'b'},
4256         { "color",              required_argument, 0, 'c'},
4257         { "full-size-mode",     no_argument,       0, 'D'},
4258         { "daemon",             required_argument, 0, 'd'},
4259         { "slope-mode",         no_argument,       0, 'E'},
4260         { "end",                required_argument, 0, 'e'},
4261         { "force-rules-legend", no_argument,       0, 'F'},
4262         { "imginfo",            required_argument, 0, 'f'},
4263         { "graph-render-mode",  required_argument, 0, 'G'},
4264         { "no-legend",          no_argument,       0, 'g'},
4265         { "height",             required_argument, 0, 'h'},
4266         { "no-minor",           no_argument,       0, 'I'},
4267         { "interlaced",         no_argument,       0, 'i'},
4268         { "alt-autoscale-min",  no_argument,       0, 'J'},
4269         { "only-graph",         no_argument,       0, 'j'},
4270         { "units-length",       required_argument, 0, 'L'},
4271         { "lower-limit",        required_argument, 0, 'l'},
4272         { "alt-autoscale-max",  no_argument,       0, 'M'},
4273         { "zoom",               required_argument, 0, 'm'},
4274         { "no-gridfit",         no_argument,       0, 'N'},
4275         { "font",               required_argument, 0, 'n'},
4276         { "logarithmic",        no_argument,       0, 'o'},
4277         { "pango-markup",       no_argument,       0, 'P'},
4278         { "font-render-mode",   required_argument, 0, 'R'},
4279         { "rigid",              no_argument,       0, 'r'},
4280         { "step",               required_argument, 0, 'S'},
4281         { "start",              required_argument, 0, 's'},
4282         { "tabwidth",           required_argument, 0, 'T'},
4283         { "title",              required_argument, 0, 't'},
4284         { "upper-limit",        required_argument, 0, 'u'},
4285         { "vertical-label",     required_argument, 0, 'v'},
4286         { "watermark",          required_argument, 0, 'W'},
4287         { "width",              required_argument, 0, 'w'},
4288         { "units-exponent",     required_argument, 0, 'X'},
4289         { "x-grid",             required_argument, 0, 'x'},
4290         { "alt-y-grid",         no_argument,       0, 'Y'},
4291         { "y-grid",             required_argument, 0, 'y'},
4292         { "lazy",               no_argument,       0, 'z'},
4293         { "units",              required_argument, 0, LONGOPT_UNITS_SI},
4294         { "alt-y-mrtg",         no_argument,       0, 1000},    /* this has no effect it is just here to save old apps from crashing when they use it */
4295         { "disable-rrdtool-tag",no_argument,       0, 1001},
4296         { "right-axis",         required_argument, 0, 1002},
4297         { "right-axis-label",   required_argument, 0, 1003},
4298         { "right-axis-format",  required_argument, 0, 1004},
4299         { "legend-position",    required_argument, 0, 1005},
4300         { "legend-direction",   required_argument, 0, 1006},
4301         { "border",             required_argument, 0, 1007},
4302         { "grid-dash",          required_argument, 0, 1008},
4303         { "dynamic-labels",     no_argument,       0, 1009},
4304         {  0, 0, 0, 0}
4305 };
4306 /* *INDENT-ON* */
4307
4308     optind = 0;
4309     opterr = 0;         /* initialize getopt */
4310     rrd_parsetime("end-24h", &start_tv);
4311     rrd_parsetime("now", &end_tv);
4312     while (1) {
4313         int       option_index = 0;
4314         int       opt;
4315         int       col_start, col_end;
4316
4317         opt = getopt_long(argc, argv,
4318                           "Aa:B:b:c:Dd:Ee:Ff:G:gh:IiJjL:l:Mm:Nn:oPR:rS:s:T:t:u:v:W:w:X:x:Yy:z",
4319                           long_options, &option_index);
4320         if (opt == EOF)
4321             break;
4322         switch (opt) {
4323         case 'I':
4324             im->extra_flags |= NOMINOR;
4325             break;
4326         case 'Y':
4327             im->extra_flags |= ALTYGRID;
4328             break;
4329         case 'A':
4330             im->extra_flags |= ALTAUTOSCALE;
4331             break;
4332         case 'J':
4333             im->extra_flags |= ALTAUTOSCALE_MIN;
4334             break;
4335         case 'M':
4336             im->extra_flags |= ALTAUTOSCALE_MAX;
4337             break;
4338         case 'j':
4339             im->extra_flags |= ONLY_GRAPH;
4340             break;
4341         case 'g':
4342             im->extra_flags |= NOLEGEND;
4343             break;
4344         case 1005:
4345             if (strcmp(optarg, "north") == 0) {
4346                 im->legendposition = NORTH;
4347             } else if (strcmp(optarg, "west") == 0) {
4348                 im->legendposition = WEST;
4349             } else if (strcmp(optarg, "south") == 0) {
4350                 im->legendposition = SOUTH;
4351             } else if (strcmp(optarg, "east") == 0) {
4352                 im->legendposition = EAST;
4353             } else {
4354                 rrd_set_error("unknown legend-position '%s'", optarg);
4355                 return;
4356             }
4357             break;
4358         case 1006:
4359             if (strcmp(optarg, "topdown") == 0) {
4360                 im->legenddirection = TOP_DOWN;
4361             } else if (strcmp(optarg, "bottomup") == 0) {
4362                 im->legenddirection = BOTTOM_UP;
4363             } else {
4364                 rrd_set_error("unknown legend-position '%s'", optarg);
4365                 return;
4366             }
4367             break;
4368         case 'F':
4369             im->extra_flags |= FORCE_RULES_LEGEND;
4370             break;
4371         case 1001:
4372             im->extra_flags |= NO_RRDTOOL_TAG;
4373             break;
4374         case LONGOPT_UNITS_SI:
4375             if (im->extra_flags & FORCE_UNITS) {
4376                 rrd_set_error("--units can only be used once!");
4377                 return;
4378             }
4379             if (strcmp(optarg, "si") == 0)
4380                 im->extra_flags |= FORCE_UNITS_SI;
4381             else {
4382                 rrd_set_error("invalid argument for --units: %s", optarg);
4383                 return;
4384             }
4385             break;
4386         case 'X':
4387             im->unitsexponent = atoi(optarg);
4388             break;
4389         case 'L':
4390             im->unitslength = atoi(optarg);
4391             im->forceleftspace = 1;
4392             break;
4393         case 'T':
4394             im->tabwidth = atof(optarg);
4395             break;
4396         case 'S':
4397             im->step = atoi(optarg);
4398             break;
4399         case 'N':
4400             im->gridfit = 0;
4401             break;
4402         case 'P':
4403             im->with_markup = 1;
4404             break;
4405         case 's':
4406             if ((parsetime_error = rrd_parsetime(optarg, &start_tv))) {
4407                 rrd_set_error("start time: %s", parsetime_error);
4408                 return;
4409             }
4410             break;
4411         case 'e':
4412             if ((parsetime_error = rrd_parsetime(optarg, &end_tv))) {
4413                 rrd_set_error("end time: %s", parsetime_error);
4414                 return;
4415             }
4416             break;
4417         case 'x':
4418             if (strcmp(optarg, "none") == 0) {
4419                 im->draw_x_grid = 0;
4420                 break;
4421             };
4422             if (sscanf(optarg,
4423                        "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
4424                        scan_gtm,
4425                        &im->xlab_user.gridst,
4426                        scan_mtm,
4427                        &im->xlab_user.mgridst,
4428                        scan_ltm,
4429                        &im->xlab_user.labst,
4430                        &im->xlab_user.precis, &stroff) == 7 && stroff != 0) {
4431                 strncpy(im->xlab_form, optarg + stroff,
4432                         sizeof(im->xlab_form) - 1);
4433                 im->xlab_form[sizeof(im->xlab_form) - 1] = '\0';
4434                 if ((int)
4435                     (im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1) {
4436                     rrd_set_error("unknown keyword %s", scan_gtm);
4437                     return;
4438                 } else if ((int)
4439                            (im->xlab_user.mgridtm = tmt_conv(scan_mtm))
4440                            == -1) {
4441                     rrd_set_error("unknown keyword %s", scan_mtm);
4442                     return;
4443                 } else if ((int)
4444                            (im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1) {
4445                     rrd_set_error("unknown keyword %s", scan_ltm);
4446                     return;
4447                 }
4448                 im->xlab_user.minsec = 1;
4449                 im->xlab_user.stst = im->xlab_form;
4450             } else {
4451                 rrd_set_error("invalid x-grid format");
4452                 return;
4453             }
4454             break;
4455         case 'y':
4456
4457             if (strcmp(optarg, "none") == 0) {
4458                 im->draw_y_grid = 0;
4459                 break;
4460             };
4461             if (sscanf(optarg, "%lf:%d", &im->ygridstep, &im->ylabfact) == 2) {
4462                 if (im->ygridstep <= 0) {
4463                     rrd_set_error("grid step must be > 0");
4464                     return;
4465                 } else if (im->ylabfact < 1) {
4466                     rrd_set_error("label factor must be > 0");
4467                     return;
4468                 }
4469             } else {
4470                 rrd_set_error("invalid y-grid format");
4471                 return;
4472             }
4473             break;
4474         case 1007:
4475             im->draw_3d_border = atoi(optarg);
4476             break;
4477         case 1008: /* grid-dash */
4478             if(sscanf(optarg,
4479                       "%lf:%lf",
4480                       &im->grid_dash_on,
4481                       &im->grid_dash_off) != 2) {
4482                 rrd_set_error("expected grid-dash format float:float");
4483                 return;
4484             }
4485             break;
4486         case 1009: /* enable dynamic labels */
4487             im->dynamic_labels = 1;
4488             break;
4489         case 1002: /* right y axis */
4490
4491             if(sscanf(optarg,
4492                       "%lf:%lf",
4493                       &im->second_axis_scale,
4494                       &im->second_axis_shift) == 2) {
4495                 if(im->second_axis_scale==0){
4496                     rrd_set_error("the second_axis_scale  must not be 0");
4497                     return;
4498                 }
4499             } else {
4500                 rrd_set_error("invalid right-axis format expected scale:shift");
4501                 return;
4502             }
4503             break;
4504         case 1003:
4505             strncpy(im->second_axis_legend,optarg,150);
4506             im->second_axis_legend[150]='\0';
4507             break;
4508         case 1004:
4509             if (bad_format(optarg)){
4510                 rrd_set_error("use either %le or %lf formats");
4511                 return;
4512             }
4513             strncpy(im->second_axis_format,optarg,150);
4514             im->second_axis_format[150]='\0';
4515             break;
4516         case 'v':
4517             strncpy(im->ylegend, optarg, 150);
4518             im->ylegend[150] = '\0';
4519             break;
4520         case 'u':
4521             im->maxval = atof(optarg);
4522             break;
4523         case 'l':
4524             im->minval = atof(optarg);
4525             break;
4526         case 'b':
4527             im->base = atol(optarg);
4528             if (im->base != 1024 && im->base != 1000) {
4529                 rrd_set_error
4530                     ("the only sensible value for base apart from 1000 is 1024");
4531                 return;
4532             }
4533             break;
4534         case 'w':
4535             long_tmp = atol(optarg);
4536             if (long_tmp < 10) {
4537                 rrd_set_error("width below 10 pixels");
4538                 return;
4539             }
4540             im->xsize = long_tmp;
4541             break;
4542         case 'h':
4543             long_tmp = atol(optarg);
4544             if (long_tmp < 10) {
4545                 rrd_set_error("height below 10 pixels");
4546                 return;
4547             }
4548             im->ysize = long_tmp;
4549             break;
4550         case 'D':
4551             im->extra_flags |= FULL_SIZE_MODE;
4552             break;
4553         case 'i':
4554             /* interlaced png not supported at the moment */
4555             break;
4556         case 'r':
4557             im->rigid = 1;
4558             break;
4559         case 'f':
4560             im->imginfo = optarg;
4561             break;
4562         case 'a':
4563             if ((int)
4564                 (im->imgformat = if_conv(optarg)) == -1) {
4565                 rrd_set_error("unsupported graphics format '%s'", optarg);
4566                 return;
4567             }
4568             break;
4569         case 'z':
4570             im->lazy = 1;
4571             break;
4572         case 'E':
4573             im->slopemode = 1;
4574             break;
4575         case 'o':
4576             im->logarithmic = 1;
4577             break;
4578         case 'c':
4579             if (sscanf(optarg,
4580                        "%10[A-Z]#%n%8lx%n",
4581                        col_nam, &col_start, &color, &col_end) == 2) {
4582                 int       ci;
4583                 int       col_len = col_end - col_start;
4584
4585                 switch (col_len) {
4586                 case 3:
4587                     color =
4588                         (((color & 0xF00) * 0x110000) | ((color & 0x0F0) *
4589                                                          0x011000) |
4590                          ((color & 0x00F)
4591                           * 0x001100)
4592                          | 0x000000FF);
4593                     break;
4594                 case 4:
4595                     color =
4596                         (((color & 0xF000) *
4597                           0x11000) | ((color & 0x0F00) *
4598                                       0x01100) | ((color &
4599                                                    0x00F0) *
4600                                                   0x00110) |
4601                          ((color & 0x000F) * 0x00011)
4602                         );
4603                     break;
4604                 case 6:
4605                     color = (color << 8) + 0xff /* shift left by 8 */ ;
4606                     break;
4607                 case 8:
4608                     break;
4609                 default:
4610                     rrd_set_error("the color format is #RRGGBB[AA]");
4611                     return;
4612                 }
4613                 if ((ci = grc_conv(col_nam)) != -1) {
4614                     im->graph_col[ci] = gfx_hex_to_col(color);
4615                 } else {
4616                     rrd_set_error("invalid color name '%s'", col_nam);
4617                     return;
4618                 }
4619             } else {
4620                 rrd_set_error("invalid color def format");
4621                 return;
4622             }
4623             break;
4624         case 'n':{
4625             char      prop[15];
4626             double    size = 1;
4627             int       end;
4628
4629             if (sscanf(optarg, "%10[A-Z]:%lf%n", prop, &size, &end) >= 2) {
4630                 int       sindex, propidx;
4631
4632                 if ((sindex = text_prop_conv(prop)) != -1) {
4633                     for (propidx = sindex;
4634                          propidx < TEXT_PROP_LAST; propidx++) {
4635                         if (size > 0) {
4636                             rrd_set_font_desc(im,propidx,NULL,size);
4637                         }
4638                         if ((int) strlen(optarg) > end+2) {
4639                             if (optarg[end] == ':') {
4640                                 rrd_set_font_desc(im,propidx,optarg + end + 1,0);
4641                             } else {
4642                                 rrd_set_error
4643                                     ("expected : after font size in '%s'",
4644                                      optarg);
4645                                 return;
4646                             }
4647                         }
4648                         /* only run the for loop for DEFAULT (0) for
4649                            all others, we break here. woodo programming */
4650                         if (propidx == sindex && sindex != 0)
4651                             break;
4652                     }
4653                 } else {
4654                     rrd_set_error("invalid fonttag '%s'", prop);
4655                     return;
4656                 }
4657             } else {
4658                 rrd_set_error("invalid text property format");
4659                 return;
4660             }
4661             break;
4662         }
4663         case 'm':
4664             im->zoom = atof(optarg);
4665             if (im->zoom <= 0.0) {
4666                 rrd_set_error("zoom factor must be > 0");
4667                 return;
4668             }
4669             break;
4670         case 't':
4671             strncpy(im->title, optarg, 150);
4672             im->title[150] = '\0';
4673             break;
4674         case 'R':
4675             if (strcmp(optarg, "normal") == 0) {
4676                 cairo_font_options_set_antialias
4677                     (im->font_options, CAIRO_ANTIALIAS_GRAY);
4678                 cairo_font_options_set_hint_style
4679                     (im->font_options, CAIRO_HINT_STYLE_FULL);
4680             } else if (strcmp(optarg, "light") == 0) {
4681                 cairo_font_options_set_antialias
4682                     (im->font_options, CAIRO_ANTIALIAS_GRAY);
4683                 cairo_font_options_set_hint_style
4684                     (im->font_options, CAIRO_HINT_STYLE_SLIGHT);
4685             } else if (strcmp(optarg, "mono") == 0) {
4686                 cairo_font_options_set_antialias
4687                     (im->font_options, CAIRO_ANTIALIAS_NONE);
4688                 cairo_font_options_set_hint_style
4689                     (im->font_options, CAIRO_HINT_STYLE_FULL);
4690             } else {
4691                 rrd_set_error("unknown font-render-mode '%s'", optarg);
4692                 return;
4693             }
4694             break;
4695         case 'G':
4696             if (strcmp(optarg, "normal") == 0)
4697                 im->graph_antialias = CAIRO_ANTIALIAS_GRAY;
4698             else if (strcmp(optarg, "mono") == 0)
4699                 im->graph_antialias = CAIRO_ANTIALIAS_NONE;
4700             else {
4701                 rrd_set_error("unknown graph-render-mode '%s'", optarg);
4702                 return;
4703             }
4704             break;
4705         case 'B':
4706             /* not supported curently */
4707             break;
4708         case 'W':
4709             strncpy(im->watermark, optarg, 100);
4710             im->watermark[99] = '\0';
4711             break;
4712         case 'd':
4713         {
4714             if (im->daemon_addr != NULL)
4715             {
4716                 rrd_set_error ("You cannot specify --daemon "
4717                         "more than once.");
4718                 return;
4719             }
4720
4721             im->daemon_addr = strdup(optarg);
4722             if (im->daemon_addr == NULL)
4723             {
4724               rrd_set_error("strdup failed");
4725               return;
4726             }
4727
4728             break;
4729         }
4730         case '?':
4731             if (optopt != 0)
4732                 rrd_set_error("unknown option '%c'", optopt);
4733             else
4734                 rrd_set_error("unknown option '%s'", argv[optind - 1]);
4735             return;
4736         }
4737     } /* while (1) */
4738
4739     pango_cairo_context_set_font_options(pango_layout_get_context(im->layout), im->font_options);
4740     pango_layout_context_changed(im->layout);
4741
4742
4743
4744     if (im->logarithmic && im->minval <= 0) {
4745         rrd_set_error
4746             ("for a logarithmic yaxis you must specify a lower-limit > 0");
4747         return;
4748     }
4749
4750     if (rrd_proc_start_end(&start_tv, &end_tv, &start_tmp, &end_tmp) == -1) {
4751         /* error string is set in rrd_parsetime.c */
4752         return;
4753     }
4754
4755     if (start_tmp < 3600 * 24 * 365 * 10) {
4756         rrd_set_error
4757             ("the first entry to fetch should be after 1980 (%ld)",
4758              start_tmp);
4759         return;
4760     }
4761
4762     if (end_tmp < start_tmp) {
4763         rrd_set_error
4764             ("start (%ld) should be less than end (%ld)", start_tmp, end_tmp);
4765         return;
4766     }
4767
4768     im->start = start_tmp;
4769     im->end = end_tmp;
4770     im->step = max((long) im->step, (im->end - im->start) / im->xsize);
4771 }
4772
4773 int rrd_graph_color(
4774     image_desc_t
4775     *im,
4776     char *var,
4777     char *err,
4778     int optional)
4779 {
4780     char     *color;
4781     graph_desc_t *gdp = &im->gdes[im->gdes_c - 1];
4782
4783     color = strstr(var, "#");
4784     if (color == NULL) {
4785         if (optional == 0) {
4786             rrd_set_error("Found no color in %s", err);
4787             return 0;
4788         }
4789         return 0;
4790     } else {
4791         int       n = 0;
4792         char     *rest;
4793         long unsigned int col;
4794
4795         rest = strstr(color, ":");
4796         if (rest != NULL)
4797             n = rest - color;
4798         else
4799             n = strlen(color);
4800         switch (n) {
4801         case 7:
4802             sscanf(color, "#%6lx%n", &col, &n);
4803             col = (col << 8) + 0xff /* shift left by 8 */ ;
4804             if (n != 7)
4805                 rrd_set_error("Color problem in %s", err);
4806             break;
4807         case 9:
4808             sscanf(color, "#%8lx%n", &col, &n);
4809             if (n == 9)
4810                 break;
4811         default:
4812             rrd_set_error("Color problem in %s", err);
4813         }
4814         if (rrd_test_error())
4815             return 0;
4816         gdp->col = gfx_hex_to_col(col);
4817         return n;
4818     }
4819 }
4820
4821
4822 int bad_format(
4823     char *fmt)
4824 {
4825     char     *ptr;
4826     int       n = 0;
4827
4828     ptr = fmt;
4829     while (*ptr != '\0')
4830         if (*ptr++ == '%') {
4831
4832             /* line cannot end with percent char */
4833             if (*ptr == '\0')
4834                 return 1;
4835             /* '%s', '%S' and '%%' are allowed */
4836             if (*ptr == 's' || *ptr == 'S' || *ptr == '%')
4837                 ptr++;
4838             /* %c is allowed (but use only with vdef!) */
4839             else if (*ptr == 'c') {
4840                 ptr++;
4841                 n = 1;
4842             }
4843
4844             /* or else '% 6.2lf' and such are allowed */
4845             else {
4846                 /* optional padding character */
4847                 if (*ptr == ' ' || *ptr == '+' || *ptr == '-')
4848                     ptr++;
4849                 /* This should take care of 'm.n' with all three optional */
4850                 while (*ptr >= '0' && *ptr <= '9')
4851                     ptr++;
4852                 if (*ptr == '.')
4853                     ptr++;
4854                 while (*ptr >= '0' && *ptr <= '9')
4855                     ptr++;
4856                 /* Either 'le', 'lf' or 'lg' must follow here */
4857                 if (*ptr++ != 'l')
4858                     return 1;
4859                 if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g')
4860                     ptr++;
4861                 else
4862                     return 1;
4863                 n++;
4864             }
4865         }
4866
4867     return (n != 1);
4868 }
4869
4870
4871 int vdef_parse(
4872     struct graph_desc_t
4873     *gdes,
4874     const char *const str)
4875 {
4876     /* A VDEF currently is either "func" or "param,func"
4877      * so the parsing is rather simple.  Change if needed.
4878      */
4879     double    param;
4880     char      func[30];
4881     int       n;
4882
4883     n = 0;
4884     sscanf(str, "%le,%29[A-Z]%n", &param, func, &n);
4885     if (n == (int) strlen(str)) {   /* matched */
4886         ;
4887     } else {
4888         n = 0;
4889         sscanf(str, "%29[A-Z]%n", func, &n);
4890         if (n == (int) strlen(str)) {   /* matched */
4891             param = DNAN;
4892         } else {
4893             rrd_set_error
4894                 ("Unknown function string '%s' in VDEF '%s'",
4895                  str, gdes->vname);
4896             return -1;
4897         }
4898     }
4899     if (!strcmp("PERCENT", func))
4900         gdes->vf.op = VDEF_PERCENT;
4901     else if (!strcmp("PERCENTNAN", func))
4902         gdes->vf.op = VDEF_PERCENTNAN;
4903     else if (!strcmp("MAXIMUM", func))
4904         gdes->vf.op = VDEF_MAXIMUM;
4905     else if (!strcmp("AVERAGE", func))
4906         gdes->vf.op = VDEF_AVERAGE;
4907     else if (!strcmp("STDEV", func))
4908         gdes->vf.op = VDEF_STDEV;
4909     else if (!strcmp("MINIMUM", func))
4910         gdes->vf.op = VDEF_MINIMUM;
4911     else if (!strcmp("TOTAL", func))
4912         gdes->vf.op = VDEF_TOTAL;
4913     else if (!strcmp("FIRST", func))
4914         gdes->vf.op = VDEF_FIRST;
4915     else if (!strcmp("LAST", func))
4916         gdes->vf.op = VDEF_LAST;
4917     else if (!strcmp("LSLSLOPE", func))
4918         gdes->vf.op = VDEF_LSLSLOPE;
4919     else if (!strcmp("LSLINT", func))
4920         gdes->vf.op = VDEF_LSLINT;
4921     else if (!strcmp("LSLCORREL", func))
4922         gdes->vf.op = VDEF_LSLCORREL;
4923     else {
4924         rrd_set_error
4925             ("Unknown function '%s' in VDEF '%s'\n", func, gdes->vname);
4926         return -1;
4927     };
4928     switch (gdes->vf.op) {
4929     case VDEF_PERCENT:
4930     case VDEF_PERCENTNAN:
4931         if (isnan(param)) { /* no parameter given */
4932             rrd_set_error
4933                 ("Function '%s' needs parameter in VDEF '%s'\n",
4934                  func, gdes->vname);
4935             return -1;
4936         };
4937         if (param >= 0.0 && param <= 100.0) {
4938             gdes->vf.param = param;
4939             gdes->vf.val = DNAN;    /* undefined */
4940             gdes->vf.when = 0;  /* undefined */
4941             gdes->vf.never = 1;
4942         } else {
4943             rrd_set_error
4944                 ("Parameter '%f' out of range in VDEF '%s'\n",
4945                  param, gdes->vname);
4946             return -1;
4947         };
4948         break;
4949     case VDEF_MAXIMUM:
4950     case VDEF_AVERAGE:
4951     case VDEF_STDEV:
4952     case VDEF_MINIMUM:
4953     case VDEF_TOTAL:
4954     case VDEF_FIRST:
4955     case VDEF_LAST:
4956     case VDEF_LSLSLOPE:
4957     case VDEF_LSLINT:
4958     case VDEF_LSLCORREL:
4959         if (isnan(param)) {
4960             gdes->vf.param = DNAN;
4961             gdes->vf.val = DNAN;
4962             gdes->vf.when = 0;
4963             gdes->vf.never = 1;
4964         } else {
4965             rrd_set_error
4966                 ("Function '%s' needs no parameter in VDEF '%s'\n",
4967                  func, gdes->vname);
4968             return -1;
4969         };
4970         break;
4971     };
4972     return 0;
4973 }
4974
4975
4976 int vdef_calc(
4977     image_desc_t *im,
4978     int gdi)
4979 {
4980     graph_desc_t *src, *dst;
4981     rrd_value_t *data;
4982     long      step, steps;
4983
4984     dst = &im->gdes[gdi];
4985     src = &im->gdes[dst->vidx];
4986     data = src->data + src->ds;
4987
4988     steps = (src->end - src->start) / src->step;
4989 #if 0
4990     printf
4991         ("DEBUG: start == %lu, end == %lu, %lu steps\n",
4992          src->start, src->end, steps);
4993 #endif
4994     switch (dst->vf.op) {
4995     case VDEF_PERCENT:{
4996         rrd_value_t *array;
4997         int       field;
4998         if ((array = (rrd_value_t*)malloc(steps * sizeof(double))) == NULL) {
4999             rrd_set_error("malloc VDEV_PERCENT");
5000             return -1;
5001         }
5002         for (step = 0; step < steps; step++) {
5003             array[step] = data[step * src->ds_cnt];
5004         }
5005         qsort(array, step, sizeof(double), vdef_percent_compar);
5006         field = round((dst->vf.param * (double)(steps - 1)) / 100.0);
5007         dst->vf.val = array[field];
5008         dst->vf.when = 0;   /* no time component */
5009         dst->vf.never = 1;
5010         free(array);
5011 #if 0
5012         for (step = 0; step < steps; step++)
5013             printf("DEBUG: %3li:%10.2f %c\n",
5014                    step, array[step], step == field ? '*' : ' ');
5015 #endif
5016     }
5017         break;
5018     case VDEF_PERCENTNAN:{
5019         rrd_value_t *array;
5020         int       field;
5021        /* count number of "valid" values */
5022        int nancount=0;
5023        for (step = 0; step < steps; step++) {
5024          if (!isnan(data[step * src->ds_cnt])) { nancount++; }
5025        }
5026        /* and allocate it */
5027         if ((array = (rrd_value_t*)malloc(nancount * sizeof(double))) == NULL) {
5028             rrd_set_error("malloc VDEV_PERCENT");
5029             return -1;
5030         }
5031        /* and fill it in */
5032        field=0;
5033         for (step = 0; step < steps; step++) {
5034            if (!isnan(data[step * src->ds_cnt])) {
5035                 array[field] = data[step * src->ds_cnt];
5036                field++;
5037             }
5038         }
5039         qsort(array, nancount, sizeof(double), vdef_percent_compar);
5040         field = round( dst->vf.param * (double)(nancount - 1) / 100.0);
5041         dst->vf.val = array[field];
5042         dst->vf.when = 0;   /* no time component */
5043         dst->vf.never = 1;
5044         free(array);
5045     }
5046         break;
5047     case VDEF_MAXIMUM:
5048         step = 0;
5049         while (step != steps && isnan(data[step * src->ds_cnt]))
5050             step++;
5051         if (step == steps) {
5052             dst->vf.val = DNAN;
5053             dst->vf.when = 0;
5054             dst->vf.never = 1;
5055         } else {
5056             dst->vf.val = data[step * src->ds_cnt];
5057             dst->vf.when = src->start + (step + 1) * src->step;
5058             dst->vf.never = 0;
5059         }
5060         while (step != steps) {
5061             if (finite(data[step * src->ds_cnt])) {
5062                 if (data[step * src->ds_cnt] > dst->vf.val) {
5063                     dst->vf.val = data[step * src->ds_cnt];
5064                     dst->vf.when = src->start + (step + 1) * src->step;
5065                     dst->vf.never = 0;
5066                 }
5067             }
5068             step++;
5069         }
5070         break;
5071     case VDEF_TOTAL:
5072     case VDEF_STDEV:
5073     case VDEF_AVERAGE:{
5074         int       cnt = 0;
5075         double    sum = 0.0;
5076         double    average = 0.0;
5077
5078         for (step = 0; step < steps; step++) {
5079             if (finite(data[step * src->ds_cnt])) {
5080                 sum += data[step * src->ds_cnt];
5081                 cnt++;
5082             };
5083         }
5084         if (cnt) {
5085             if (dst->vf.op == VDEF_TOTAL) {
5086                 dst->vf.val = sum * src->step;
5087                 dst->vf.when = 0;   /* no time component */
5088                 dst->vf.never = 1;
5089             } else if (dst->vf.op == VDEF_AVERAGE) {
5090                 dst->vf.val = sum / cnt;
5091                 dst->vf.when = 0;   /* no time component */
5092                 dst->vf.never = 1;
5093             } else {
5094                 average = sum / cnt;
5095                 sum = 0.0;
5096                 for (step = 0; step < steps; step++) {
5097                     if (finite(data[step * src->ds_cnt])) {
5098                         sum += pow((data[step * src->ds_cnt] - average), 2.0);
5099                     };
5100                 }
5101                 dst->vf.val = pow(sum / cnt, 0.5);
5102                 dst->vf.when = 0;   /* no time component */
5103                 dst->vf.never = 1;
5104             };
5105         } else {
5106             dst->vf.val = DNAN;
5107             dst->vf.when = 0;
5108             dst->vf.never = 1;
5109         }
5110     }
5111         break;
5112     case VDEF_MINIMUM:
5113         step = 0;
5114         while (step != steps && isnan(data[step * src->ds_cnt]))
5115             step++;
5116         if (step == steps) {
5117             dst->vf.val = DNAN;
5118             dst->vf.when = 0;
5119             dst->vf.never = 1;
5120         } else {
5121             dst->vf.val = data[step * src->ds_cnt];
5122             dst->vf.when = src->start + (step + 1) * src->step;
5123             dst->vf.never = 0;
5124         }
5125         while (step != steps) {
5126             if (finite(data[step * src->ds_cnt])) {
5127                 if (data[step * src->ds_cnt] < dst->vf.val) {
5128                     dst->vf.val = data[step * src->ds_cnt];
5129                     dst->vf.when = src->start + (step + 1) * src->step;
5130                     dst->vf.never = 0;
5131                 }
5132             }
5133             step++;
5134         }
5135         break;
5136     case VDEF_FIRST:
5137         /* The time value returned here is one step before the
5138          * actual time value.  This is the start of the first
5139          * non-NaN interval.
5140          */
5141         step = 0;
5142         while (step != steps && isnan(data[step * src->ds_cnt]))
5143             step++;
5144         if (step == steps) {    /* all entries were NaN */
5145             dst->vf.val = DNAN;
5146             dst->vf.when = 0;
5147             dst->vf.never = 1;
5148         } else {
5149             dst->vf.val = data[step * src->ds_cnt];
5150             dst->vf.when = src->start + step * src->step;
5151             dst->vf.never = 0;
5152         }
5153         break;
5154     case VDEF_LAST:
5155         /* The time value returned here is the
5156          * actual time value.  This is the end of the last
5157          * non-NaN interval.
5158          */
5159         step = steps - 1;
5160         while (step >= 0 && isnan(data[step * src->ds_cnt]))
5161             step--;
5162         if (step < 0) { /* all entries were NaN */
5163             dst->vf.val = DNAN;
5164             dst->vf.when = 0;
5165             dst->vf.never = 1;
5166         } else {
5167             dst->vf.val = data[step * src->ds_cnt];
5168             dst->vf.when = src->start + (step + 1) * src->step;
5169             dst->vf.never = 0;
5170         }
5171         break;
5172     case VDEF_LSLSLOPE:
5173     case VDEF_LSLINT:
5174     case VDEF_LSLCORREL:{
5175         /* Bestfit line by linear least squares method */
5176
5177         int       cnt = 0;
5178         double    SUMx, SUMy, SUMxy, SUMxx, SUMyy, slope, y_intercept, correl;
5179
5180         SUMx = 0;
5181         SUMy = 0;
5182         SUMxy = 0;
5183         SUMxx = 0;
5184         SUMyy = 0;
5185         for (step = 0; step < steps; step++) {
5186             if (finite(data[step * src->ds_cnt])) {
5187                 cnt++;
5188                 SUMx += step;
5189                 SUMxx += step * step;
5190                 SUMxy += step * data[step * src->ds_cnt];
5191                 SUMy += data[step * src->ds_cnt];
5192                 SUMyy += data[step * src->ds_cnt] * data[step * src->ds_cnt];
5193             };
5194         }
5195
5196         slope = (SUMx * SUMy - cnt * SUMxy) / (SUMx * SUMx - cnt * SUMxx);
5197         y_intercept = (SUMy - slope * SUMx) / cnt;
5198         correl =
5199             (SUMxy -
5200              (SUMx * SUMy) / cnt) /
5201             sqrt((SUMxx -
5202                   (SUMx * SUMx) / cnt) * (SUMyy - (SUMy * SUMy) / cnt));
5203         if (cnt) {
5204             if (dst->vf.op == VDEF_LSLSLOPE) {
5205                 dst->vf.val = slope;
5206                 dst->vf.when = 0;
5207                 dst->vf.never = 1;
5208             } else if (dst->vf.op == VDEF_LSLINT) {
5209                 dst->vf.val = y_intercept;
5210                 dst->vf.when = 0;
5211                 dst->vf.never = 1;
5212             } else if (dst->vf.op == VDEF_LSLCORREL) {
5213                 dst->vf.val = correl;
5214                 dst->vf.when = 0;
5215                 dst->vf.never = 1;
5216             };
5217         } else {
5218             dst->vf.val = DNAN;
5219             dst->vf.when = 0;
5220             dst->vf.never = 1;
5221         }
5222     }
5223         break;
5224     }
5225     return 0;
5226 }
5227
5228 /* NaN < -INF < finite_values < INF */
5229 int vdef_percent_compar(
5230     const void
5231     *a,
5232     const void
5233     *b)
5234 {
5235     /* Equality is not returned; this doesn't hurt except
5236      * (maybe) for a little performance.
5237      */
5238
5239     /* First catch NaN values. They are smallest */
5240     if (isnan(*(double *) a))
5241         return -1;
5242     if (isnan(*(double *) b))
5243         return 1;
5244     /* NaN doesn't reach this part so INF and -INF are extremes.
5245      * The sign from isinf() is compatible with the sign we return
5246      */
5247     if (isinf(*(double *) a))
5248         return isinf(*(double *) a);
5249     if (isinf(*(double *) b))
5250         return isinf(*(double *) b);
5251     /* If we reach this, both values must be finite */
5252     if (*(double *) a < *(double *) b)
5253         return -1;
5254     else
5255         return 1;
5256 }
5257
5258 void grinfo_push(
5259     image_desc_t *im,
5260     char *key,
5261     rrd_info_type_t type,
5262     rrd_infoval_t value)
5263 {
5264     im->grinfo_current = rrd_info_push(im->grinfo_current, key, type, value);
5265     if (im->grinfo == NULL) {
5266         im->grinfo = im->grinfo_current;
5267     }
5268 }
5269
5270
5271 void time_clean(
5272     char *result,
5273     char *format)
5274 {
5275     int       j, jj;
5276
5277 /*     Handling based on
5278        - ANSI C99 Specifications                         http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1124.pdf
5279        - Single UNIX Specification version 2             http://www.opengroup.org/onlinepubs/007908799/xsh/strftime.html
5280        - POSIX:2001/Single UNIX Specification version 3  http://www.opengroup.org/onlinepubs/009695399/functions/strftime.html
5281        - POSIX:2008 Specifications                       http://www.opengroup.org/onlinepubs/9699919799/functions/strftime.html
5282        Specifications tells
5283        "If a conversion specifier is not one of the above, the behavior is undefined."
5284
5285       C99 tells
5286        "A conversion specifier consists of a % character, possibly followed by an E or O modifier character (described below), followed by a character that determines the behavior of the conversion specifier.
5287
5288       POSIX:2001 tells
5289       "A conversion specification consists of a '%' character, possibly followed by an E or O modifier, and a terminating conversion specifier character that determines the conversion specification's behavior."
5290
5291       POSIX:2008 introduce more complexe behavior that are not handled here.
5292
5293       According to this, this code will replace:
5294       - % followed by @ by a %@
5295       - % followed by   by a %SPACE
5296       - % followed by . by a %.
5297       - % followed by % by a %
5298       - % followed by t by a TAB
5299       - % followed by E then anything by '-'
5300       - % followed by O then anything by '-'
5301       - % followed by anything else by at least one '-'. More characters may be added to better fit expected output length
5302 */
5303
5304     jj = 0;
5305     for(j = 0; (j < FMT_LEG_LEN - 1) && (jj < FMT_LEG_LEN); j++) { /* we don't need to parse the last char */
5306         if (format[j] == '%') {
5307             if ((format[j+1] == 'E') || (format[j+1] == 'O')) {
5308                 result[jj++] = '-';
5309                 j+=2; /* We skip next 2 following char */
5310             } else if ((format[j+1] == 'C') || (format[j+1] == 'd') ||
5311                        (format[j+1] == 'g') || (format[j+1] == 'H') ||
5312                        (format[j+1] == 'I') || (format[j+1] == 'm') ||
5313                        (format[j+1] == 'M') || (format[j+1] == 'S') ||
5314                        (format[j+1] == 'U') || (format[j+1] == 'V') ||
5315                        (format[j+1] == 'W') || (format[j+1] == 'y')) {
5316                 result[jj++] = '-';
5317                 if (jj < FMT_LEG_LEN) {
5318                     result[jj++] = '-';
5319                 }
5320                 j++; /* We skip the following char */
5321             } else if (format[j+1] == 'j') {
5322                 result[jj++] = '-';
5323                 if (jj < FMT_LEG_LEN - 1) {
5324                     result[jj++] = '-';
5325                     result[jj++] = '-';
5326                }
5327                 j++; /* We skip the following char */
5328             } else if ((format[j+1] == 'G') || (format[j+1] == 'Y')) {
5329                 /* Assuming Year on 4 digit */
5330                 result[jj++] = '-';
5331                 if (jj < FMT_LEG_LEN - 2) {
5332                     result[jj++] = '-';
5333                     result[jj++] = '-';
5334                     result[jj++] = '-';
5335                 }
5336                 j++; /* We skip the following char */
5337             } else if (format[j+1] == 'R') {
5338                 result[jj++] = '-';
5339                 if (jj < FMT_LEG_LEN - 3) {
5340                     result[jj++] = '-';
5341                     result[jj++] = ':';
5342                     result[jj++] = '-';
5343                     result[jj++] = '-';
5344                 }
5345                 j++; /* We skip the following char */
5346             } else if (format[j+1] == 'T') {
5347                 result[jj++] = '-';
5348                 if (jj < FMT_LEG_LEN - 6) {
5349                     result[jj++] = '-';
5350                     result[jj++] = ':';
5351                     result[jj++] = '-';
5352                     result[jj++] = '-';
5353                     result[jj++] = ':';
5354                     result[jj++] = '-';
5355                     result[jj++] = '-';
5356                 }
5357                 j++; /* We skip the following char */
5358             } else if (format[j+1] == 'F') {
5359                 result[jj++] = '-';
5360                 if (jj < FMT_LEG_LEN - 8) {
5361                     result[jj++] = '-';
5362                     result[jj++] = '-';
5363                     result[jj++] = '-';
5364                     result[jj++] = '-';
5365                     result[jj++] = '-';
5366                     result[jj++] = '-';
5367                     result[jj++] = '-';
5368                     result[jj++] = '-';
5369                     result[jj++] = '-';
5370                 }
5371                 j++; /* We skip the following char */
5372             } else if (format[j+1] == 'D') {
5373                 result[jj++] = '-';
5374                 if (jj < FMT_LEG_LEN - 6) {
5375                     result[jj++] = '-';
5376                     result[jj++] = '/';
5377                     result[jj++] = '-';
5378                     result[jj++] = '-';
5379                     result[jj++] = '/';
5380                     result[jj++] = '-';
5381                     result[jj++] = '-';
5382                 }
5383                 j++; /* We skip the following char */
5384             } else if (format[j+1] == 'n') {
5385                 result[jj++] = '\r';
5386                 result[jj++] = '\n';
5387                 j++; /* We skip the following char */
5388             } else if (format[j+1] == 't') {
5389                 result[jj++] = '\t';
5390                 j++; /* We skip the following char */
5391             } else if (format[j+1] == '%') {
5392                 result[jj++] = '%';
5393                 j++; /* We skip the following char */
5394             } else if (format[j+1] == ' ') {
5395                 if (jj < FMT_LEG_LEN - 1) {
5396                     result[jj++] = '%';
5397                     result[jj++] = ' ';
5398                 }
5399                 j++; /* We skip the following char */
5400             } else if (format[j+1] == '.') {
5401                 if (jj < FMT_LEG_LEN - 1) {
5402                     result[jj++] = '%';
5403                     result[jj++] = '.';
5404                 }
5405                 j++; /* We skip the following char */
5406             } else if (format[j+1] == '@') {
5407                 if (jj < FMT_LEG_LEN - 1) {
5408                     result[jj++] = '%';
5409                     result[jj++] = '@';
5410                 }
5411                 j++; /* We skip the following char */
5412             } else {
5413                 result[jj++] = '-';
5414                 j++; /* We skip the following char */
5415             }
5416         } else {
5417                 result[jj++] = format[j];
5418         }
5419     }
5420     result[jj] = '\0'; /* We must force the end of the string */
5421 }