src/rrd_graph.c

   1 /****************************************************************************
   2  * RRDtool 1.3.2  Copyright by Tobi Oetiker, 1997-2008
   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 #ifdef HAVE_TIME_H
  29 #include <time.h>
  30 #endif
  31
  32 #ifdef HAVE_LOCALE_H
  33 #include <locale.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(STACK, GF_STACK);
 238     conv_if(TICK, GF_TICK);
 239     conv_if(TEXTALIGN, GF_TEXTALIGN);
 240     conv_if(DEF, GF_DEF);
 241     conv_if(CDEF, GF_CDEF);
 242     conv_if(VDEF, GF_VDEF);
 243     conv_if(XPORT, GF_XPORT);
 244     conv_if(SHIFT, GF_SHIFT);
 245
 246     return (enum gf_en)(-1);
 247 }
 248
 249 enum gfx_if_en if_conv(
 250     char *string)
 251 {
 252
 253     conv_if(PNG, IF_PNG);
 254     conv_if(SVG, IF_SVG);
 255     conv_if(EPS, IF_EPS);
 256     conv_if(PDF, IF_PDF);
 257
 258     return (enum gfx_if_en)(-1);
 259 }
 260
 261 enum tmt_en tmt_conv(
 262     char *string)
 263 {
 264
 265     conv_if(SECOND, TMT_SECOND);
 266     conv_if(MINUTE, TMT_MINUTE);
 267     conv_if(HOUR, TMT_HOUR);
 268     conv_if(DAY, TMT_DAY);
 269     conv_if(WEEK, TMT_WEEK);
 270     conv_if(MONTH, TMT_MONTH);
 271     conv_if(YEAR, TMT_YEAR);
 272     return (enum tmt_en)(-1);
 273 }
 274
 275 enum grc_en grc_conv(
 276     char *string)
 277 {
 278
 279     conv_if(BACK, GRC_BACK);
 280     conv_if(CANVAS, GRC_CANVAS);
 281     conv_if(SHADEA, GRC_SHADEA);
 282     conv_if(SHADEB, GRC_SHADEB);
 283     conv_if(GRID, GRC_GRID);
 284     conv_if(MGRID, GRC_MGRID);
 285     conv_if(FONT, GRC_FONT);
 286     conv_if(ARROW, GRC_ARROW);
 287     conv_if(AXIS, GRC_AXIS);
 288     conv_if(FRAME, GRC_FRAME);
 289
 290     return (enum grc_en)(-1);
 291 }
 292
 293 enum text_prop_en text_prop_conv(
 294     char *string)
 295 {
 296
 297     conv_if(DEFAULT, TEXT_PROP_DEFAULT);
 298     conv_if(TITLE, TEXT_PROP_TITLE);
 299     conv_if(AXIS, TEXT_PROP_AXIS);
 300     conv_if(UNIT, TEXT_PROP_UNIT);
 301     conv_if(LEGEND, TEXT_PROP_LEGEND);
 302     conv_if(WATERMARK, TEXT_PROP_WATERMARK);
 303     return (enum text_prop_en)(-1);
 304 }
 305
 306
 307 #undef conv_if
 308
 309 int im_free(
 310     image_desc_t *im)
 311 {
 312     unsigned long i, ii;
 313     cairo_status_t status = (cairo_status_t) 0;
 314
 315     if (im == NULL)
 316         return 0;
 317
 318     if (im->daemon_addr != NULL)
 319       free(im->daemon_addr);
 320
 321     for (i = 0; i < (unsigned) im->gdes_c; i++) {
 322         if (im->gdes[i].data_first) {
 323             /* careful here, because a single pointer can occur several times */
 324             free(im->gdes[i].data);
 325             if (im->gdes[i].ds_namv) {
 326                 for (ii = 0; ii < im->gdes[i].ds_cnt; ii++)
 327                     free(im->gdes[i].ds_namv[ii]);
 328                 free(im->gdes[i].ds_namv);
 329             }
 330         }
 331         /* free allocated memory used for dashed lines */
 332         if (im->gdes[i].p_dashes != NULL)
 333             free(im->gdes[i].p_dashes);
 334
 335         free(im->gdes[i].p_data);
 336         free(im->gdes[i].rpnp);
 337     }
 338     free(im->gdes);
 339     if (im->font_options)
 340         cairo_font_options_destroy(im->font_options);
 341
 342     if (im->cr) {
 343         status = cairo_status(im->cr);
 344         cairo_destroy(im->cr);
 345     }
 346     if (im->rendered_image) {
 347         free(im->rendered_image);
 348     }
 349
 350     if (im->layout) {
 351         g_object_unref (im->layout);
 352     }
 353
 354     if (im->surface)
 355         cairo_surface_destroy(im->surface);
 356
 357     if (status)
 358         fprintf(stderr, "OOPS: Cairo has issues it can't even die: %s\n",
 359                 cairo_status_to_string(status));
 360
 361     return 0;
 362 }
 363
 364 /* find SI magnitude symbol for the given number*/
 365 void auto_scale(
 366     image_desc_t *im,   /* image description */
 367     double *value,
 368     char **symb_ptr,
 369     double *magfact)
 370 {
 371
 372     char     *symbol[] = { "a", /* 10e-18 Atto */
 373         "f",            /* 10e-15 Femto */
 374         "p",            /* 10e-12 Pico */
 375         "n",            /* 10e-9  Nano */
 376         "u",            /* 10e-6  Micro */
 377         "m",            /* 10e-3  Milli */
 378         " ",            /* Base */
 379         "k",            /* 10e3   Kilo */
 380         "M",            /* 10e6   Mega */
 381         "G",            /* 10e9   Giga */
 382         "T",            /* 10e12  Tera */
 383         "P",            /* 10e15  Peta */
 384         "E"
 385     };                  /* 10e18  Exa */
 386
 387     int       symbcenter = 6;
 388     int       sindex;
 389
 390     if (*value == 0.0 || isnan(*value)) {
 391         sindex = 0;
 392         *magfact = 1.0;
 393     } else {
 394         sindex = floor(log(fabs(*value)) / log((double) im->base));
 395         *magfact = pow((double) im->base, (double) sindex);
 396         (*value) /= (*magfact);
 397     }
 398     if (sindex <= symbcenter && sindex >= -symbcenter) {
 399         (*symb_ptr) = symbol[sindex + symbcenter];
 400     } else {
 401         (*symb_ptr) = "?";
 402     }
 403 }
 404
 405
 406 static char si_symbol[] = {
 407     'a',                /* 10e-18 Atto */
 408     'f',                /* 10e-15 Femto */
 409     'p',                /* 10e-12 Pico */
 410     'n',                /* 10e-9  Nano */
 411     'u',                /* 10e-6  Micro */
 412     'm',                /* 10e-3  Milli */
 413     ' ',                /* Base */
 414     'k',                /* 10e3   Kilo */
 415     'M',                /* 10e6   Mega */
 416     'G',                /* 10e9   Giga */
 417     'T',                /* 10e12  Tera */
 418     'P',                /* 10e15  Peta */
 419     'E',                /* 10e18  Exa */
 420 };
 421 static const int si_symbcenter = 6;
 422
 423 /* find SI magnitude symbol for the numbers on the y-axis*/
 424 void si_unit(
 425     image_desc_t *im    /* image description */
 426     )
 427 {
 428
 429     double    digits, viewdigits = 0;
 430
 431     digits =
 432         floor(log(max(fabs(im->minval), fabs(im->maxval))) /
 433               log((double) im->base));
 434
 435     if (im->unitsexponent != 9999) {
 436         /* unitsexponent = 9, 6, 3, 0, -3, -6, -9, etc */
 437         viewdigits = floor((double)(im->unitsexponent / 3));
 438     } else {
 439         viewdigits = digits;
 440     }
 441
 442     im->magfact = pow((double) im->base, digits);
 443
 444 #ifdef DEBUG
 445     printf("digits %6.3f  im->magfact %6.3f\n", digits, im->magfact);
 446 #endif
 447
 448     im->viewfactor = im->magfact / pow((double) im->base, viewdigits);
 449
 450     if (((viewdigits + si_symbcenter) < sizeof(si_symbol)) &&
 451         ((viewdigits + si_symbcenter) >= 0))
 452         im->symbol = si_symbol[(int) viewdigits + si_symbcenter];
 453     else
 454         im->symbol = '?';
 455 }
 456
 457 /*  move min and max values around to become sensible */
 458
 459 void expand_range(
 460     image_desc_t *im)
 461 {
 462     double    sensiblevalues[] = { 1000.0, 900.0, 800.0, 750.0, 700.0,
 463         600.0, 500.0, 400.0, 300.0, 250.0,
 464         200.0, 125.0, 100.0, 90.0, 80.0,
 465         75.0, 70.0, 60.0, 50.0, 40.0, 30.0,
 466         25.0, 20.0, 10.0, 9.0, 8.0,
 467         7.0, 6.0, 5.0, 4.0, 3.5, 3.0,
 468         2.5, 2.0, 1.8, 1.5, 1.2, 1.0,
 469         0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.0, -1
 470     };
 471
 472     double    scaled_min, scaled_max;
 473     double    adj;
 474     int       i;
 475
 476
 477
 478 #ifdef DEBUG
 479     printf("Min: %6.2f Max: %6.2f MagFactor: %6.2f\n",
 480            im->minval, im->maxval, im->magfact);
 481 #endif
 482
 483     if (isnan(im->ygridstep)) {
 484         if (im->extra_flags & ALTAUTOSCALE) {
 485             /* measure the amplitude of the function. Make sure that
 486                graph boundaries are slightly higher then max/min vals
 487                so we can see amplitude on the graph */
 488             double    delt, fact;
 489
 490             delt = im->maxval - im->minval;
 491             adj = delt * 0.1;
 492             fact = 2.0 * pow(10.0,
 493                              floor(log10
 494                                    (max(fabs(im->minval), fabs(im->maxval)) /
 495                                     im->magfact)) - 2);
 496             if (delt < fact) {
 497                 adj = (fact - delt) * 0.55;
 498 #ifdef DEBUG
 499                 printf
 500                     ("Min: %6.2f Max: %6.2f delt: %6.2f fact: %6.2f adj: %6.2f\n",
 501                      im->minval, im->maxval, delt, fact, adj);
 502 #endif
 503             }
 504             im->minval -= adj;
 505             im->maxval += adj;
 506         } else if (im->extra_flags & ALTAUTOSCALE_MIN) {
 507             /* measure the amplitude of the function. Make sure that
 508                graph boundaries are slightly lower than min vals
 509                so we can see amplitude on the graph */
 510             adj = (im->maxval - im->minval) * 0.1;
 511             im->minval -= adj;
 512         } else if (im->extra_flags & ALTAUTOSCALE_MAX) {
 513             /* measure the amplitude of the function. Make sure that
 514                graph boundaries are slightly higher than max vals
 515                so we can see amplitude on the graph */
 516             adj = (im->maxval - im->minval) * 0.1;
 517             im->maxval += adj;
 518         } else {
 519             scaled_min = im->minval / im->magfact;
 520             scaled_max = im->maxval / im->magfact;
 521
 522             for (i = 1; sensiblevalues[i] > 0; i++) {
 523                 if (sensiblevalues[i - 1] >= scaled_min &&
 524                     sensiblevalues[i] <= scaled_min)
 525                     im->minval = sensiblevalues[i] * (im->magfact);
 526
 527                 if (-sensiblevalues[i - 1] <= scaled_min &&
 528                     -sensiblevalues[i] >= scaled_min)
 529                     im->minval = -sensiblevalues[i - 1] * (im->magfact);
 530
 531                 if (sensiblevalues[i - 1] >= scaled_max &&
 532                     sensiblevalues[i] <= scaled_max)
 533                     im->maxval = sensiblevalues[i - 1] * (im->magfact);
 534
 535                 if (-sensiblevalues[i - 1] <= scaled_max &&
 536                     -sensiblevalues[i] >= scaled_max)
 537                     im->maxval = -sensiblevalues[i] * (im->magfact);
 538             }
 539         }
 540     } else {
 541         /* adjust min and max to the grid definition if there is one */
 542         im->minval = (double) im->ylabfact * im->ygridstep *
 543             floor(im->minval / ((double) im->ylabfact * im->ygridstep));
 544         im->maxval = (double) im->ylabfact * im->ygridstep *
 545             ceil(im->maxval / ((double) im->ylabfact * im->ygridstep));
 546     }
 547
 548 #ifdef DEBUG
 549     fprintf(stderr, "SCALED Min: %6.2f Max: %6.2f Factor: %6.2f\n",
 550             im->minval, im->maxval, im->magfact);
 551 #endif
 552 }
 553
 554
 555 void apply_gridfit(
 556     image_desc_t *im)
 557 {
 558     if (isnan(im->minval) || isnan(im->maxval))
 559         return;
 560     ytr(im, DNAN);
 561     if (im->logarithmic) {
 562         double    ya, yb, ypix, ypixfrac;
 563         double    log10_range = log10(im->maxval) - log10(im->minval);
 564
 565         ya = pow((double) 10, floor(log10(im->minval)));
 566         while (ya < im->minval)
 567             ya *= 10;
 568         if (ya > im->maxval)
 569             return;     /* don't have y=10^x gridline */
 570         yb = ya * 10;
 571         if (yb <= im->maxval) {
 572             /* we have at least 2 y=10^x gridlines.
 573                Make sure distance between them in pixels
 574                are an integer by expanding im->maxval */
 575             double    y_pixel_delta = ytr(im, ya) - ytr(im, yb);
 576             double    factor = y_pixel_delta / floor(y_pixel_delta);
 577             double    new_log10_range = factor * log10_range;
 578             double    new_ymax_log10 = log10(im->minval) + new_log10_range;
 579
 580             im->maxval = pow(10, new_ymax_log10);
 581             ytr(im, DNAN);  /* reset precalc */
 582             log10_range = log10(im->maxval) - log10(im->minval);
 583         }
 584         /* make sure first y=10^x gridline is located on
 585            integer pixel position by moving scale slightly
 586            downwards (sub-pixel movement) */
 587         ypix = ytr(im, ya) + im->ysize; /* add im->ysize so it always is positive */
 588         ypixfrac = ypix - floor(ypix);
 589         if (ypixfrac > 0 && ypixfrac < 1) {
 590             double    yfrac = ypixfrac / im->ysize;
 591
 592             im->minval = pow(10, log10(im->minval) - yfrac * log10_range);
 593             im->maxval = pow(10, log10(im->maxval) - yfrac * log10_range);
 594             ytr(im, DNAN);  /* reset precalc */
 595         }
 596     } else {
 597         /* Make sure we have an integer pixel distance between
 598            each minor gridline */
 599         double    ypos1 = ytr(im, im->minval);
 600         double    ypos2 = ytr(im, im->minval + im->ygrid_scale.gridstep);
 601         double    y_pixel_delta = ypos1 - ypos2;
 602         double    factor = y_pixel_delta / floor(y_pixel_delta);
 603         double    new_range = factor * (im->maxval - im->minval);
 604         double    gridstep = im->ygrid_scale.gridstep;
 605         double    minor_y, minor_y_px, minor_y_px_frac;
 606
 607         if (im->maxval > 0.0)
 608             im->maxval = im->minval + new_range;
 609         else
 610             im->minval = im->maxval - new_range;
 611         ytr(im, DNAN);  /* reset precalc */
 612         /* make sure first minor gridline is on integer pixel y coord */
 613         minor_y = gridstep * floor(im->minval / gridstep);
 614         while (minor_y < im->minval)
 615             minor_y += gridstep;
 616         minor_y_px = ytr(im, minor_y) + im->ysize;  /* ensure > 0 by adding ysize */
 617         minor_y_px_frac = minor_y_px - floor(minor_y_px);
 618         if (minor_y_px_frac > 0 && minor_y_px_frac < 1) {
 619             double    yfrac = minor_y_px_frac / im->ysize;
 620             double    range = im->maxval - im->minval;
 621
 622             im->minval = im->minval - yfrac * range;
 623             im->maxval = im->maxval - yfrac * range;
 624             ytr(im, DNAN);  /* reset precalc */
 625         }
 626         calc_horizontal_grid(im);   /* recalc with changed im->maxval */
 627     }
 628 }
 629
 630 /* reduce data reimplementation by Alex */
 631
 632 void reduce_data(
 633     enum cf_en cf,      /* which consolidation function ? */
 634     unsigned long cur_step, /* step the data currently is in */
 635     time_t *start,      /* start, end and step as requested ... */
 636     time_t *end,        /* ... by the application will be   ... */
 637     unsigned long *step,    /* ... adjusted to represent reality    */
 638     unsigned long *ds_cnt,  /* number of data sources in file */
 639     rrd_value_t **data)
 640 {                       /* two dimensional array containing the data */
 641     int       i, reduce_factor = ceil((double) (*step) / (double) cur_step);
 642     unsigned long col, dst_row, row_cnt, start_offset, end_offset, skiprows =
 643         0;
 644     rrd_value_t *srcptr, *dstptr;
 645
 646     (*step) = cur_step * reduce_factor; /* set new step size for reduced data */
 647     dstptr = *data;
 648     srcptr = *data;
 649     row_cnt = ((*end) - (*start)) / cur_step;
 650
 651 #ifdef DEBUG
 652 #define DEBUG_REDUCE
 653 #endif
 654 #ifdef DEBUG_REDUCE
 655     printf("Reducing %lu rows with factor %i time %lu to %lu, step %lu\n",
 656            row_cnt, reduce_factor, *start, *end, cur_step);
 657     for (col = 0; col < row_cnt; col++) {
 658         printf("time %10lu: ", *start + (col + 1) * cur_step);
 659         for (i = 0; i < *ds_cnt; i++)
 660             printf(" %8.2e", srcptr[*ds_cnt * col + i]);
 661         printf("\n");
 662     }
 663 #endif
 664
 665     /* We have to combine [reduce_factor] rows of the source
 666      ** into one row for the destination.  Doing this we also
 667      ** need to take care to combine the correct rows.  First
 668      ** alter the start and end time so that they are multiples
 669      ** of the new step time.  We cannot reduce the amount of
 670      ** time so we have to move the end towards the future and
 671      ** the start towards the past.
 672      */
 673     end_offset = (*end) % (*step);
 674     start_offset = (*start) % (*step);
 675
 676     /* If there is a start offset (which cannot be more than
 677      ** one destination row), skip the appropriate number of
 678      ** source rows and one destination row.  The appropriate
 679      ** number is what we do know (start_offset/cur_step) of
 680      ** the new interval (*step/cur_step aka reduce_factor).
 681      */
 682 #ifdef DEBUG_REDUCE
 683     printf("start_offset: %lu  end_offset: %lu\n", start_offset, end_offset);
 684     printf("row_cnt before:  %lu\n", row_cnt);
 685 #endif
 686     if (start_offset) {
 687         (*start) = (*start) - start_offset;
 688         skiprows = reduce_factor - start_offset / cur_step;
 689         srcptr += skiprows * *ds_cnt;
 690         for (col = 0; col < (*ds_cnt); col++)
 691             *dstptr++ = DNAN;
 692         row_cnt -= skiprows;
 693     }
 694 #ifdef DEBUG_REDUCE
 695     printf("row_cnt between: %lu\n", row_cnt);
 696 #endif
 697
 698     /* At the end we have some rows that are not going to be
 699      ** used, the amount is end_offset/cur_step
 700      */
 701     if (end_offset) {
 702         (*end) = (*end) - end_offset + (*step);
 703         skiprows = end_offset / cur_step;
 704         row_cnt -= skiprows;
 705     }
 706 #ifdef DEBUG_REDUCE
 707     printf("row_cnt after:   %lu\n", row_cnt);
 708 #endif
 709
 710 /* Sanity check: row_cnt should be multiple of reduce_factor */
 711 /* if this gets triggered, something is REALLY WRONG ... we die immediately */
 712
 713     if (row_cnt % reduce_factor) {
 714         printf("SANITY CHECK: %lu rows cannot be reduced by %i \n",
 715                row_cnt, reduce_factor);
 716         printf("BUG in reduce_data()\n");
 717         exit(1);
 718     }
 719
 720     /* Now combine reduce_factor intervals at a time
 721      ** into one interval for the destination.
 722      */
 723
 724     for (dst_row = 0; (long int) row_cnt >= reduce_factor; dst_row++) {
 725         for (col = 0; col < (*ds_cnt); col++) {
 726             rrd_value_t newval = DNAN;
 727             unsigned long validval = 0;
 728
 729             for (i = 0; i < reduce_factor; i++) {
 730                 if (isnan(srcptr[i * (*ds_cnt) + col])) {
 731                     continue;
 732                 }
 733                 validval++;
 734                 if (isnan(newval))
 735                     newval = srcptr[i * (*ds_cnt) + col];
 736                 else {
 737                     switch (cf) {
 738                     case CF_HWPREDICT:
 739                     case CF_MHWPREDICT:
 740                     case CF_DEVSEASONAL:
 741                     case CF_DEVPREDICT:
 742                     case CF_SEASONAL:
 743                     case CF_AVERAGE:
 744                         newval += srcptr[i * (*ds_cnt) + col];
 745                         break;
 746                     case CF_MINIMUM:
 747                         newval = min(newval, srcptr[i * (*ds_cnt) + col]);
 748                         break;
 749                     case CF_FAILURES:
 750                         /* an interval contains a failure if any subintervals contained a failure */
 751                     case CF_MAXIMUM:
 752                         newval = max(newval, srcptr[i * (*ds_cnt) + col]);
 753                         break;
 754                     case CF_LAST:
 755                         newval = srcptr[i * (*ds_cnt) + col];
 756                         break;
 757                     }
 758                 }
 759             }
 760             if (validval == 0) {
 761                 newval = DNAN;
 762             } else {
 763                 switch (cf) {
 764                 case CF_HWPREDICT:
 765                 case CF_MHWPREDICT:
 766                 case CF_DEVSEASONAL:
 767                 case CF_DEVPREDICT:
 768                 case CF_SEASONAL:
 769                 case CF_AVERAGE:
 770                     newval /= validval;
 771                     break;
 772                 case CF_MINIMUM:
 773                 case CF_FAILURES:
 774                 case CF_MAXIMUM:
 775                 case CF_LAST:
 776                     break;
 777                 }
 778             }
 779             *dstptr++ = newval;
 780         }
 781         srcptr += (*ds_cnt) * reduce_factor;
 782         row_cnt -= reduce_factor;
 783     }
 784     /* If we had to alter the endtime, we didn't have enough
 785      ** source rows to fill the last row. Fill it with NaN.
 786      */
 787     if (end_offset)
 788         for (col = 0; col < (*ds_cnt); col++)
 789             *dstptr++ = DNAN;
 790 #ifdef DEBUG_REDUCE
 791     row_cnt = ((*end) - (*start)) / *step;
 792     srcptr = *data;
 793     printf("Done reducing. Currently %lu rows, time %lu to %lu, step %lu\n",
 794            row_cnt, *start, *end, *step);
 795     for (col = 0; col < row_cnt; col++) {
 796         printf("time %10lu: ", *start + (col + 1) * (*step));
 797         for (i = 0; i < *ds_cnt; i++)
 798             printf(" %8.2e", srcptr[*ds_cnt * col + i]);
 799         printf("\n");
 800     }
 801 #endif
 802 }
 803
 804
 805 /* get the data required for the graphs from the
 806    relevant rrds ... */
 807
 808 int data_fetch(
 809     image_desc_t *im)
 810 {
 811     int       i, ii;
 812     int       skip;
 813
 814     /* pull the data from the rrd files ... */
 815     for (i = 0; i < (int) im->gdes_c; i++) {
 816         /* only GF_DEF elements fetch data */
 817         if (im->gdes[i].gf != GF_DEF)
 818             continue;
 819
 820         skip = 0;
 821         /* do we have it already ? */
 822         for (ii = 0; ii < i; ii++) {
 823             if (im->gdes[ii].gf != GF_DEF)
 824                 continue;
 825             if ((strcmp(im->gdes[i].rrd, im->gdes[ii].rrd) == 0)
 826                 && (im->gdes[i].cf == im->gdes[ii].cf)
 827                 && (im->gdes[i].cf_reduce == im->gdes[ii].cf_reduce)
 828                 && (im->gdes[i].start_orig == im->gdes[ii].start_orig)
 829                 && (im->gdes[i].end_orig == im->gdes[ii].end_orig)
 830                 && (im->gdes[i].step_orig == im->gdes[ii].step_orig)) {
 831                 /* OK, the data is already there.
 832                  ** Just copy the header portion
 833                  */
 834                 im->gdes[i].start = im->gdes[ii].start;
 835                 im->gdes[i].end = im->gdes[ii].end;
 836                 im->gdes[i].step = im->gdes[ii].step;
 837                 im->gdes[i].ds_cnt = im->gdes[ii].ds_cnt;
 838                 im->gdes[i].ds_namv = im->gdes[ii].ds_namv;
 839                 im->gdes[i].data = im->gdes[ii].data;
 840                 im->gdes[i].data_first = 0;
 841                 skip = 1;
 842             }
 843             if (skip)
 844                 break;
 845         }
 846         if (!skip) {
 847             unsigned long ft_step = im->gdes[i].step;   /* ft_step will record what we got from fetch */
 848
 849             /* Flush the file if
 850              * - a connection to the daemon has been established
 851              * - this is the first occurrence of that RRD file
 852              */
 853             if (rrdc_is_connected(im->daemon_addr))
 854             {
 855                 int status;
 856
 857                 status = 0;
 858                 for (ii = 0; ii < i; ii++)
 859                 {
 860                     if (strcmp (im->gdes[i].rrd, im->gdes[ii].rrd) == 0)
 861                     {
 862                         status = 1;
 863                         break;
 864                     }
 865                 }
 866
 867                 if (status == 0)
 868                 {
 869                     status = rrdc_flush (im->gdes[i].rrd);
 870                     if (status != 0)
 871                     {
 872                         rrd_set_error ("rrdc_flush (%s) failed with status %i.",
 873                                 im->gdes[i].rrd, status);
 874                         return (-1);
 875                     }
 876                 }
 877             } /* if (rrdc_is_connected()) */
 878
 879             if ((rrd_fetch_fn(im->gdes[i].rrd,
 880                               im->gdes[i].cf,
 881                               &im->gdes[i].start,
 882                               &im->gdes[i].end,
 883                               &ft_step,
 884                               &im->gdes[i].ds_cnt,
 885                               &im->gdes[i].ds_namv,
 886                               &im->gdes[i].data)) == -1) {
 887                 return -1;
 888             }
 889             im->gdes[i].data_first = 1;
 890
 891             if (ft_step < im->gdes[i].step) {
 892                 reduce_data(im->gdes[i].cf_reduce,
 893                             ft_step,
 894                             &im->gdes[i].start,
 895                             &im->gdes[i].end,
 896                             &im->gdes[i].step,
 897                             &im->gdes[i].ds_cnt, &im->gdes[i].data);
 898             } else {
 899                 im->gdes[i].step = ft_step;
 900             }
 901         }
 902
 903         /* lets see if the required data source is really there */
 904         for (ii = 0; ii < (int) im->gdes[i].ds_cnt; ii++) {
 905             if (strcmp(im->gdes[i].ds_namv[ii], im->gdes[i].ds_nam) == 0) {
 906                 im->gdes[i].ds = ii;
 907             }
 908         }
 909         if (im->gdes[i].ds == -1) {
 910             rrd_set_error("No DS called '%s' in '%s'",
 911                           im->gdes[i].ds_nam, im->gdes[i].rrd);
 912             return -1;
 913         }
 914
 915     }
 916     return 0;
 917 }
 918
 919 /* evaluate the expressions in the CDEF functions */
 920
 921 /*************************************************************
 922  * CDEF stuff
 923  *************************************************************/
 924
 925 long find_var_wrapper(
 926     void *arg1,
 927     char *key)
 928 {
 929     return find_var((image_desc_t *) arg1, key);
 930 }
 931
 932 /* find gdes containing var*/
 933 long find_var(
 934     image_desc_t *im,
 935     char *key)
 936 {
 937     long      ii;
 938
 939     for (ii = 0; ii < im->gdes_c - 1; ii++) {
 940         if ((im->gdes[ii].gf == GF_DEF
 941              || im->gdes[ii].gf == GF_VDEF || im->gdes[ii].gf == GF_CDEF)
 942             && (strcmp(im->gdes[ii].vname, key) == 0)) {
 943             return ii;
 944         }
 945     }
 946     return -1;
 947 }
 948
 949 /* find the greatest common divisor for all the numbers
 950    in the 0 terminated num array */
 951 long lcd(
 952     long *num)
 953 {
 954     long      rest;
 955     int       i;
 956
 957     for (i = 0; num[i + 1] != 0; i++) {
 958         do {
 959             rest = num[i] % num[i + 1];
 960             num[i] = num[i + 1];
 961             num[i + 1] = rest;
 962         } while (rest != 0);
 963         num[i + 1] = num[i];
 964     }
 965 /*    return i==0?num[i]:num[i-1]; */
 966     return num[i];
 967 }
 968
 969 /* run the rpn calculator on all the VDEF and CDEF arguments */
 970 int data_calc(
 971     image_desc_t *im)
 972 {
 973
 974     int       gdi;
 975     int       dataidx;
 976     long     *steparray, rpi;
 977     int       stepcnt;
 978     time_t    now;
 979     rpnstack_t rpnstack;
 980
 981     rpnstack_init(&rpnstack);
 982
 983     for (gdi = 0; gdi < im->gdes_c; gdi++) {
 984         /* Look for GF_VDEF and GF_CDEF in the same loop,
 985          * so CDEFs can use VDEFs and vice versa
 986          */
 987         switch (im->gdes[gdi].gf) {
 988         case GF_XPORT:
 989             break;
 990         case GF_SHIFT:{
 991             graph_desc_t *vdp = &im->gdes[im->gdes[gdi].vidx];
 992
 993             /* remove current shift */
 994             vdp->start -= vdp->shift;
 995             vdp->end -= vdp->shift;
 996
 997             /* vdef */
 998             if (im->gdes[gdi].shidx >= 0)
 999                 vdp->shift = im->gdes[im->gdes[gdi].shidx].vf.val;
1000             /* constant */
1001             else
1002                 vdp->shift = im->gdes[gdi].shval;
1003
1004             /* normalize shift to multiple of consolidated step */
1005             vdp->shift = (vdp->shift / (long) vdp->step) * (long) vdp->step;
1006
1007             /* apply shift */
1008             vdp->start += vdp->shift;
1009             vdp->end += vdp->shift;
1010             break;
1011         }
1012         case GF_VDEF:
1013             /* A VDEF has no DS.  This also signals other parts
1014              * of rrdtool that this is a VDEF value, not a CDEF.
1015              */
1016             im->gdes[gdi].ds_cnt = 0;
1017             if (vdef_calc(im, gdi)) {
1018                 rrd_set_error("Error processing VDEF '%s'",
1019                               im->gdes[gdi].vname);
1020                 rpnstack_free(&rpnstack);
1021                 return -1;
1022             }
1023             break;
1024         case GF_CDEF:
1025             im->gdes[gdi].ds_cnt = 1;
1026             im->gdes[gdi].ds = 0;
1027             im->gdes[gdi].data_first = 1;
1028             im->gdes[gdi].start = 0;
1029             im->gdes[gdi].end = 0;
1030             steparray = NULL;
1031             stepcnt = 0;
1032             dataidx = -1;
1033
1034             /* Find the variables in the expression.
1035              * - VDEF variables are substituted by their values
1036              *   and the opcode is changed into OP_NUMBER.
1037              * - CDEF variables are analized for their step size,
1038              *   the lowest common denominator of all the step
1039              *   sizes of the data sources involved is calculated
1040              *   and the resulting number is the step size for the
1041              *   resulting data source.
1042              */
1043             for (rpi = 0; im->gdes[gdi].rpnp[rpi].op != OP_END; rpi++) {
1044                 if (im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
1045                     im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER) {
1046                     long      ptr = im->gdes[gdi].rpnp[rpi].ptr;
1047
1048                     if (im->gdes[ptr].ds_cnt == 0) {    /* this is a VDEF data source */
1049 #if 0
1050                         printf
1051                             ("DEBUG: inside CDEF '%s' processing VDEF '%s'\n",
1052                              im->gdes[gdi].vname, im->gdes[ptr].vname);
1053                         printf("DEBUG: value from vdef is %f\n",
1054                                im->gdes[ptr].vf.val);
1055 #endif
1056                         im->gdes[gdi].rpnp[rpi].val = im->gdes[ptr].vf.val;
1057                         im->gdes[gdi].rpnp[rpi].op = OP_NUMBER;
1058                     } else {    /* normal variables and PREF(variables) */
1059
1060                         /* add one entry to the array that keeps track of the step sizes of the
1061                          * data sources going into the CDEF. */
1062                         if ((steparray =
1063                              (long*)rrd_realloc(steparray,
1064                                          (++stepcnt +
1065                                           1) * sizeof(*steparray))) == NULL) {
1066                             rrd_set_error("realloc steparray");
1067                             rpnstack_free(&rpnstack);
1068                             return -1;
1069                         };
1070
1071                         steparray[stepcnt - 1] = im->gdes[ptr].step;
1072
1073                         /* adjust start and end of cdef (gdi) so
1074                          * that it runs from the latest start point
1075                          * to the earliest endpoint of any of the
1076                          * rras involved (ptr)
1077                          */
1078
1079                         if (im->gdes[gdi].start < im->gdes[ptr].start)
1080                             im->gdes[gdi].start = im->gdes[ptr].start;
1081
1082                         if (im->gdes[gdi].end == 0 ||
1083                             im->gdes[gdi].end > im->gdes[ptr].end)
1084                             im->gdes[gdi].end = im->gdes[ptr].end;
1085
1086                         /* store pointer to the first element of
1087                          * the rra providing data for variable,
1088                          * further save step size and data source
1089                          * count of this rra
1090                          */
1091                         im->gdes[gdi].rpnp[rpi].data =
1092                             im->gdes[ptr].data + im->gdes[ptr].ds;
1093                         im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
1094                         im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
1095
1096                         /* backoff the *.data ptr; this is done so
1097                          * rpncalc() function doesn't have to treat
1098                          * the first case differently
1099                          */
1100                     }   /* if ds_cnt != 0 */
1101                 }       /* if OP_VARIABLE */
1102             }           /* loop through all rpi */
1103
1104             /* move the data pointers to the correct period */
1105             for (rpi = 0; im->gdes[gdi].rpnp[rpi].op != OP_END; rpi++) {
1106                 if (im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
1107                     im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER) {
1108                     long      ptr = im->gdes[gdi].rpnp[rpi].ptr;
1109                     long      diff =
1110                         im->gdes[gdi].start - im->gdes[ptr].start;
1111
1112                     if (diff > 0)
1113                         im->gdes[gdi].rpnp[rpi].data +=
1114                             (diff / im->gdes[ptr].step) *
1115                             im->gdes[ptr].ds_cnt;
1116                 }
1117             }
1118
1119             if (steparray == NULL) {
1120                 rrd_set_error("rpn expressions without DEF"
1121                               " or CDEF variables are not supported");
1122                 rpnstack_free(&rpnstack);
1123                 return -1;
1124             }
1125             steparray[stepcnt] = 0;
1126             /* Now find the resulting step.  All steps in all
1127              * used RRAs have to be visited
1128              */
1129             im->gdes[gdi].step = lcd(steparray);
1130             free(steparray);
1131             if ((im->gdes[gdi].data = (rrd_value_t*)malloc(((im->gdes[gdi].end -
1132                                                im->gdes[gdi].start)
1133                                               / im->gdes[gdi].step)
1134                                              * sizeof(double))) == NULL) {
1135                 rrd_set_error("malloc im->gdes[gdi].data");
1136                 rpnstack_free(&rpnstack);
1137                 return -1;
1138             }
1139
1140             /* Step through the new cdef results array and
1141              * calculate the values
1142              */
1143             for (now = im->gdes[gdi].start + im->gdes[gdi].step;
1144                  now <= im->gdes[gdi].end; now += im->gdes[gdi].step) {
1145                 rpnp_t   *rpnp = im->gdes[gdi].rpnp;
1146
1147                 /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
1148                  * in this case we are advancing by timesteps;
1149                  * we use the fact that time_t is a synonym for long
1150                  */
1151                 if (rpn_calc(rpnp, &rpnstack, (long) now,
1152                              im->gdes[gdi].data, ++dataidx) == -1) {
1153                     /* rpn_calc sets the error string */
1154                     rpnstack_free(&rpnstack);
1155                     return -1;
1156                 }
1157             }           /* enumerate over time steps within a CDEF */
1158             break;
1159         default:
1160             continue;
1161         }
1162     }                   /* enumerate over CDEFs */
1163     rpnstack_free(&rpnstack);
1164     return 0;
1165 }
1166
1167 /* from http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm */
1168 /* yes we are loosing precision by doing tos with floats instead of doubles
1169    but it seems more stable this way. */
1170
1171 static int AlmostEqual2sComplement(
1172     float A,
1173     float B,
1174     int maxUlps)
1175 {
1176
1177     int       aInt = *(int *) &A;
1178     int       bInt = *(int *) &B;
1179     int       intDiff;
1180
1181     /* Make sure maxUlps is non-negative and small enough that the
1182        default NAN won't compare as equal to anything.  */
1183
1184     /* assert(maxUlps > 0 && maxUlps < 4 * 1024 * 1024); */
1185
1186     /* Make aInt lexicographically ordered as a twos-complement int */
1187
1188     if (aInt < 0)
1189         aInt = 0x80000000l - aInt;
1190
1191     /* Make bInt lexicographically ordered as a twos-complement int */
1192
1193     if (bInt < 0)
1194         bInt = 0x80000000l - bInt;
1195
1196     intDiff = abs(aInt - bInt);
1197
1198     if (intDiff <= maxUlps)
1199         return 1;
1200
1201     return 0;
1202 }
1203
1204 /* massage data so, that we get one value for each x coordinate in the graph */
1205 int data_proc(
1206     image_desc_t *im)
1207 {
1208     long      i, ii;
1209     double    pixstep = (double) (im->end - im->start)
1210         / (double) im->xsize;   /* how much time
1211                                    passes in one pixel */
1212     double    paintval;
1213     double    minval = DNAN, maxval = DNAN;
1214
1215     unsigned long gr_time;
1216
1217     /* memory for the processed data */
1218     for (i = 0; i < im->gdes_c; i++) {
1219         if ((im->gdes[i].gf == GF_LINE) ||
1220             (im->gdes[i].gf == GF_AREA) || (im->gdes[i].gf == GF_TICK)) {
1221             if ((im->gdes[i].p_data = (rrd_value_t*)malloc((im->xsize + 1)
1222                                              * sizeof(rrd_value_t))) == NULL) {
1223                 rrd_set_error("malloc data_proc");
1224                 return -1;
1225             }
1226         }
1227     }
1228
1229     for (i = 0; i < im->xsize; i++) {   /* for each pixel */
1230         long      vidx;
1231
1232         gr_time = im->start + pixstep * i;  /* time of the current step */
1233         paintval = 0.0;
1234
1235         for (ii = 0; ii < im->gdes_c; ii++) {
1236             double    value;
1237
1238             switch (im->gdes[ii].gf) {
1239             case GF_LINE:
1240             case GF_AREA:
1241             case GF_TICK:
1242                 if (!im->gdes[ii].stack)
1243                     paintval = 0.0;
1244                 value = im->gdes[ii].yrule;
1245                 if (isnan(value) || (im->gdes[ii].gf == GF_TICK)) {
1246                     /* The time of the data doesn't necessarily match
1247                      ** the time of the graph. Beware.
1248                      */
1249                     vidx = im->gdes[ii].vidx;
1250                     if (im->gdes[vidx].gf == GF_VDEF) {
1251                         value = im->gdes[vidx].vf.val;
1252                     } else
1253                         if (((long int) gr_time >=
1254                              (long int) im->gdes[vidx].start)
1255                             && ((long int) gr_time <=
1256                                 (long int) im->gdes[vidx].end)) {
1257                         value = im->gdes[vidx].data[(unsigned long)
1258                                                     floor((double)
1259                                                           (gr_time -
1260                                                            im->gdes[vidx].
1261                                                            start)
1262                                                           /
1263                                                           im->gdes[vidx].step)
1264                                                     * im->gdes[vidx].ds_cnt +
1265                                                     im->gdes[vidx].ds];
1266                     } else {
1267                         value = DNAN;
1268                     }
1269                 };
1270
1271                 if (!isnan(value)) {
1272                     paintval += value;
1273                     im->gdes[ii].p_data[i] = paintval;
1274                     /* GF_TICK: the data values are not
1275                      ** relevant for min and max
1276                      */
1277                     if (finite(paintval) && im->gdes[ii].gf != GF_TICK) {
1278                         if ((isnan(minval) || paintval < minval) &&
1279                             !(im->logarithmic && paintval <= 0.0))
1280                             minval = paintval;
1281                         if (isnan(maxval) || paintval > maxval)
1282                             maxval = paintval;
1283                     }
1284                 } else {
1285                     im->gdes[ii].p_data[i] = DNAN;
1286                 }
1287                 break;
1288             case GF_STACK:
1289                 rrd_set_error
1290                     ("STACK should already be turned into LINE or AREA here");
1291                 return -1;
1292                 break;
1293             default:
1294                 break;
1295             }
1296         }
1297     }
1298
1299     /* if min or max have not been asigned a value this is because
1300        there was no data in the graph ... this is not good ...
1301        lets set these to dummy values then ... */
1302
1303     if (im->logarithmic) {
1304         if (isnan(minval) || isnan(maxval) || maxval <= 0) {
1305             minval = 0.0;   /* catching this right away below */
1306             maxval = 5.1;
1307         }
1308         /* in logarithm mode, where minval is smaller or equal
1309            to 0 make the beast just way smaller than maxval */
1310         if (minval <= 0) {
1311             minval = maxval / 10e8;
1312         }
1313     } else {
1314         if (isnan(minval) || isnan(maxval)) {
1315             minval = 0.0;
1316             maxval = 1.0;
1317         }
1318     }
1319
1320     /* adjust min and max values given by the user */
1321     /* for logscale we add something on top */
1322     if (isnan(im->minval)
1323         || ((!im->rigid) && im->minval > minval)
1324         ) {
1325         if (im->logarithmic)
1326             im->minval = minval / 2.0;
1327         else
1328             im->minval = minval;
1329     }
1330     if (isnan(im->maxval)
1331         || (!im->rigid && im->maxval < maxval)
1332         ) {
1333         if (im->logarithmic)
1334             im->maxval = maxval * 2.0;
1335         else
1336             im->maxval = maxval;
1337     }
1338
1339     /* make sure min is smaller than max */
1340     if (im->minval > im->maxval) {
1341         if (im->minval > 0)
1342             im->minval = 0.99 * im->maxval;
1343         else
1344             im->minval = 1.01 * im->maxval;
1345     }
1346
1347     /* make sure min and max are not equal */
1348     if (AlmostEqual2sComplement(im->minval, im->maxval, 4)) {
1349         if (im->maxval > 0)
1350             im->maxval *= 1.01;
1351         else
1352             im->maxval *= 0.99;
1353
1354         /* make sure min and max are not both zero */
1355         if (AlmostEqual2sComplement(im->maxval, 0, 4)) {
1356             im->maxval = 1.0;
1357         }
1358     }
1359     return 0;
1360 }
1361
1362
1363
1364 /* identify the point where the first gridline, label ... gets placed */
1365
1366 time_t find_first_time(
1367     time_t start,       /* what is the initial time */
1368     enum tmt_en baseint,    /* what is the basic interval */
1369     long basestep       /* how many if these do we jump a time */
1370     )
1371 {
1372     struct tm tm;
1373
1374     localtime_r(&start, &tm);
1375
1376     switch (baseint) {
1377     case TMT_SECOND:
1378         tm.       tm_sec -= tm.tm_sec % basestep;
1379
1380         break;
1381     case TMT_MINUTE:
1382         tm.       tm_sec = 0;
1383         tm.       tm_min -= tm.tm_min % basestep;
1384
1385         break;
1386     case TMT_HOUR:
1387         tm.       tm_sec = 0;
1388         tm.       tm_min = 0;
1389         tm.       tm_hour -= tm.tm_hour % basestep;
1390
1391         break;
1392     case TMT_DAY:
1393         /* we do NOT look at the basestep for this ... */
1394         tm.       tm_sec = 0;
1395         tm.       tm_min = 0;
1396         tm.       tm_hour = 0;
1397
1398         break;
1399     case TMT_WEEK:
1400         /* we do NOT look at the basestep for this ... */
1401         tm.       tm_sec = 0;
1402         tm.       tm_min = 0;
1403         tm.       tm_hour = 0;
1404         tm.       tm_mday -= tm.tm_wday - 1;    /* -1 because we want the monday */
1405
1406         if (tm.tm_wday == 0)
1407             tm.       tm_mday -= 7; /* we want the *previous* monday */
1408
1409         break;
1410     case TMT_MONTH:
1411         tm.       tm_sec = 0;
1412         tm.       tm_min = 0;
1413         tm.       tm_hour = 0;
1414         tm.       tm_mday = 1;
1415         tm.       tm_mon -= tm.tm_mon % basestep;
1416
1417         break;
1418
1419     case TMT_YEAR:
1420         tm.       tm_sec = 0;
1421         tm.       tm_min = 0;
1422         tm.       tm_hour = 0;
1423         tm.       tm_mday = 1;
1424         tm.       tm_mon = 0;
1425         tm.       tm_year -= (
1426     tm.tm_year + 1900) %basestep;
1427
1428     }
1429     return mktime(&tm);
1430 }
1431
1432 /* identify the point where the next gridline, label ... gets placed */
1433 time_t find_next_time(
1434     time_t current,     /* what is the initial time */
1435     enum tmt_en baseint,    /* what is the basic interval */
1436     long basestep       /* how many if these do we jump a time */
1437     )
1438 {
1439     struct tm tm;
1440     time_t    madetime;
1441
1442     localtime_r(&current, &tm);
1443
1444     do {
1445         switch (baseint) {
1446         case TMT_SECOND:
1447             tm.       tm_sec += basestep;
1448
1449             break;
1450         case TMT_MINUTE:
1451             tm.       tm_min += basestep;
1452
1453             break;
1454         case TMT_HOUR:
1455             tm.       tm_hour += basestep;
1456
1457             break;
1458         case TMT_DAY:
1459             tm.       tm_mday += basestep;
1460
1461             break;
1462         case TMT_WEEK:
1463             tm.       tm_mday += 7 * basestep;
1464
1465             break;
1466         case TMT_MONTH:
1467             tm.       tm_mon += basestep;
1468
1469             break;
1470         case TMT_YEAR:
1471             tm.       tm_year += basestep;
1472         }
1473         madetime = mktime(&tm);
1474     } while (madetime == -1);   /* this is necessary to skip impssible times
1475                                    like the daylight saving time skips */
1476     return madetime;
1477
1478 }
1479
1480
1481 /* calculate values required for PRINT and GPRINT functions */
1482
1483 int print_calc(
1484     image_desc_t *im)
1485 {
1486     long      i, ii, validsteps;
1487     double    printval;
1488     struct tm tmvdef;
1489     int       graphelement = 0;
1490     long      vidx;
1491     int       max_ii;
1492     double    magfact = -1;
1493     char     *si_symb = "";
1494     char     *percent_s;
1495     int       prline_cnt = 0;
1496
1497     /* wow initializing tmvdef is quite a task :-) */
1498     time_t    now = time(NULL);
1499
1500     localtime_r(&now, &tmvdef);
1501     for (i = 0; i < im->gdes_c; i++) {
1502         vidx = im->gdes[i].vidx;
1503         switch (im->gdes[i].gf) {
1504         case GF_PRINT:
1505         case GF_GPRINT:
1506             /* PRINT and GPRINT can now print VDEF generated values.
1507              * There's no need to do any calculations on them as these
1508              * calculations were already made.
1509              */
1510             if (im->gdes[vidx].gf == GF_VDEF) { /* simply use vals */
1511                 printval = im->gdes[vidx].vf.val;
1512                 localtime_r(&im->gdes[vidx].vf.when, &tmvdef);
1513             } else {    /* need to calculate max,min,avg etcetera */
1514                 max_ii = ((im->gdes[vidx].end - im->gdes[vidx].start)
1515                           / im->gdes[vidx].step * im->gdes[vidx].ds_cnt);
1516                 printval = DNAN;
1517                 validsteps = 0;
1518                 for (ii = im->gdes[vidx].ds;
1519                      ii < max_ii; ii += im->gdes[vidx].ds_cnt) {
1520                     if (!finite(im->gdes[vidx].data[ii]))
1521                         continue;
1522                     if (isnan(printval)) {
1523                         printval = im->gdes[vidx].data[ii];
1524                         validsteps++;
1525                         continue;
1526                     }
1527
1528                     switch (im->gdes[i].cf) {
1529                     case CF_HWPREDICT:
1530                     case CF_MHWPREDICT:
1531                     case CF_DEVPREDICT:
1532                     case CF_DEVSEASONAL:
1533                     case CF_SEASONAL:
1534                     case CF_AVERAGE:
1535                         validsteps++;
1536                         printval += im->gdes[vidx].data[ii];
1537                         break;
1538                     case CF_MINIMUM:
1539                         printval = min(printval, im->gdes[vidx].data[ii]);
1540                         break;
1541                     case CF_FAILURES:
1542                     case CF_MAXIMUM:
1543                         printval = max(printval, im->gdes[vidx].data[ii]);
1544                         break;
1545                     case CF_LAST:
1546                         printval = im->gdes[vidx].data[ii];
1547                     }
1548                 }
1549                 if (im->gdes[i].cf == CF_AVERAGE || im->gdes[i].cf > CF_LAST) {
1550                     if (validsteps > 1) {
1551                         printval = (printval / validsteps);
1552                     }
1553                 }
1554             }           /* prepare printval */
1555
1556             if ((percent_s = strstr(im->gdes[i].format, "%S")) != NULL) {
1557                 /* Magfact is set to -1 upon entry to print_calc.  If it
1558                  * is still less than 0, then we need to run auto_scale.
1559                  * Otherwise, put the value into the correct units.  If
1560                  * the value is 0, then do not set the symbol or magnification
1561                  * so next the calculation will be performed again. */
1562                 if (magfact < 0.0) {
1563                     auto_scale(im, &printval, &si_symb, &magfact);
1564                     if (printval == 0.0)
1565                         magfact = -1.0;
1566                 } else {
1567                     printval /= magfact;
1568                 }
1569                 *(++percent_s) = 's';
1570             } else if (strstr(im->gdes[i].format, "%s") != NULL) {
1571                 auto_scale(im, &printval, &si_symb, &magfact);
1572             }
1573
1574             if (im->gdes[i].gf == GF_PRINT) {
1575                 rrd_infoval_t prline;
1576
1577                 if (im->gdes[i].strftm) {
1578                     prline.u_str = (char*)malloc((FMT_LEG_LEN + 2) * sizeof(char));
1579                     strftime(prline.u_str,
1580                              FMT_LEG_LEN, im->gdes[i].format, &tmvdef);
1581                 } else if (bad_format(im->gdes[i].format)) {
1582                     rrd_set_error
1583                         ("bad format for PRINT in '%s'", im->gdes[i].format);
1584                     return -1;
1585                 } else {
1586                     prline.u_str =
1587                         sprintf_alloc(im->gdes[i].format, printval, si_symb);
1588                 }
1589                 grinfo_push(im,
1590                             sprintf_alloc
1591                             ("print[%ld]", prline_cnt++), RD_I_STR, prline);
1592                 free(prline.u_str);
1593             } else {
1594                 /* GF_GPRINT */
1595
1596                 if (im->gdes[i].strftm) {
1597                     strftime(im->gdes[i].legend,
1598                              FMT_LEG_LEN, im->gdes[i].format, &tmvdef);
1599                 } else {
1600                     if (bad_format(im->gdes[i].format)) {
1601                         rrd_set_error
1602                             ("bad format for GPRINT in '%s'",
1603                              im->gdes[i].format);
1604                         return -1;
1605                     }
1606 #ifdef HAVE_SNPRINTF
1607                     snprintf(im->gdes[i].legend,
1608                              FMT_LEG_LEN - 2,
1609                              im->gdes[i].format, printval, si_symb);
1610 #else
1611                     sprintf(im->gdes[i].legend,
1612                             im->gdes[i].format, printval, si_symb);
1613 #endif
1614                 }
1615                 graphelement = 1;
1616             }
1617             break;
1618         case GF_LINE:
1619         case GF_AREA:
1620         case GF_TICK:
1621             graphelement = 1;
1622             break;
1623         case GF_HRULE:
1624             if (isnan(im->gdes[i].yrule)) { /* we must set this here or the legend printer can not decide to print the legend */
1625                 im->gdes[i].yrule = im->gdes[vidx].vf.val;
1626             };
1627             graphelement = 1;
1628             break;
1629         case GF_VRULE:
1630             if (im->gdes[i].xrule == 0) {   /* again ... the legend printer needs it */
1631                 im->gdes[i].xrule = im->gdes[vidx].vf.when;
1632             };
1633             graphelement = 1;
1634             break;
1635         case GF_COMMENT:
1636         case GF_TEXTALIGN:
1637         case GF_DEF:
1638         case GF_CDEF:
1639         case GF_VDEF:
1640 #ifdef WITH_PIECHART
1641         case GF_PART:
1642 #endif
1643         case GF_SHIFT:
1644         case GF_XPORT:
1645             break;
1646         case GF_STACK:
1647             rrd_set_error
1648                 ("STACK should already be turned into LINE or AREA here");
1649             return -1;
1650             break;
1651         }
1652     }
1653     return graphelement;
1654 }
1655
1656
1657
1658 /* place legends with color spots */
1659 int leg_place(
1660     image_desc_t *im,
1661     int calc_width)
1662 {
1663     /* graph labels */
1664     int       interleg = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
1665     int       border = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
1666     int       fill = 0, fill_last;
1667     double    legendwidth; // = im->ximg - 2 * border;
1668     int       leg_c = 0;
1669     double    leg_x = border;
1670     int       leg_y = 0; //im->yimg;
1671     int       leg_y_prev = 0; // im->yimg;
1672     int       leg_cc;
1673     double    glue = 0;
1674     int       i, ii, mark = 0;
1675     char      default_txtalign = TXA_JUSTIFIED; /*default line orientation */
1676     int      *legspace;
1677     char     *tab;
1678     char      saved_legend[FMT_LEG_LEN + 5];
1679
1680     if(calc_width){
1681         legendwidth = 0;
1682     }
1683     else{
1684         legendwidth = im->legendwidth - 2 * border;
1685     }
1686
1687
1688     if (!(im->extra_flags & NOLEGEND) && !(im->extra_flags & ONLY_GRAPH)) {
1689         if ((legspace = (int*)malloc(im->gdes_c * sizeof(int))) == NULL) {
1690             rrd_set_error("malloc for legspace");
1691             return -1;
1692         }
1693
1694         for (i = 0; i < im->gdes_c; i++) {
1695             char      prt_fctn; /*special printfunctions */
1696             if(calc_width){
1697                 strcpy(saved_legend, im->gdes[i].legend);
1698             }
1699
1700             fill_last = fill;
1701             /* hide legends for rules which are not displayed */
1702             if (im->gdes[i].gf == GF_TEXTALIGN) {
1703                 default_txtalign = im->gdes[i].txtalign;
1704             }
1705
1706             if (!(im->extra_flags & FORCE_RULES_LEGEND)) {
1707                 if (im->gdes[i].gf == GF_HRULE
1708                     && (im->gdes[i].yrule <
1709                         im->minval || im->gdes[i].yrule > im->maxval))
1710                     im->gdes[i].legend[0] = '\0';
1711                 if (im->gdes[i].gf == GF_VRULE
1712                     && (im->gdes[i].xrule <
1713                         im->start || im->gdes[i].xrule > im->end))
1714                     im->gdes[i].legend[0] = '\0';
1715             }
1716
1717             /* turn \\t into tab */
1718             while ((tab = strstr(im->gdes[i].legend, "\\t"))) {
1719                 memmove(tab, tab + 1, strlen(tab));
1720                 tab[0] = (char) 9;
1721             }
1722
1723             leg_cc = strlen(im->gdes[i].legend);
1724             /* is there a controle code at the end of the legend string ? */
1725             if (leg_cc >= 2 && im->gdes[i].legend[leg_cc - 2] == '\\') {
1726                 prt_fctn = im->gdes[i].legend[leg_cc - 1];
1727                 leg_cc -= 2;
1728                 im->gdes[i].legend[leg_cc] = '\0';
1729             } else {
1730                 prt_fctn = '\0';
1731             }
1732             /* only valid control codes */
1733             if (prt_fctn != 'l' && prt_fctn != 'n' &&   /* a synonym for l */
1734                 prt_fctn != 'r' &&
1735                 prt_fctn != 'j' &&
1736                 prt_fctn != 'c' &&
1737                 prt_fctn != 's' && prt_fctn != '\0' && prt_fctn != 'g') {
1738                 free(legspace);
1739                 rrd_set_error
1740                     ("Unknown control code at the end of '%s\\%c'",
1741                      im->gdes[i].legend, prt_fctn);
1742                 return -1;
1743             }
1744             /* \n -> \l */
1745             if (prt_fctn == 'n') {
1746                 prt_fctn = 'l';
1747             }
1748
1749             /* remove exess space from the end of the legend for \g */
1750             while (prt_fctn == 'g' &&
1751                    leg_cc > 0 && im->gdes[i].legend[leg_cc - 1] == ' ') {
1752                 leg_cc--;
1753                 im->gdes[i].legend[leg_cc] = '\0';
1754             }
1755
1756             if (leg_cc != 0) {
1757
1758                 /* no interleg space if string ends in \g */
1759                 legspace[i] = (prt_fctn == 'g' ? 0 : interleg);
1760                 if (fill > 0) {
1761                     fill += legspace[i];
1762                 }
1763                 fill +=
1764                     gfx_get_text_width(im,
1765                                        fill + border,
1766                                        im->
1767                                        text_prop
1768                                        [TEXT_PROP_LEGEND].
1769                                        font_desc,
1770                                        im->tabwidth, im->gdes[i].legend);
1771                 leg_c++;
1772             } else {
1773                 legspace[i] = 0;
1774             }
1775             /* who said there was a special tag ... ? */
1776             if (prt_fctn == 'g') {
1777                 prt_fctn = '\0';
1778             }
1779
1780             if (prt_fctn == '\0') {
1781                 if(calc_width && (fill > legendwidth)){
1782                     legendwidth = fill;
1783                 }
1784                 if (i == im->gdes_c - 1 || fill > legendwidth) {
1785                     /* just one legend item is left right or center */
1786                     switch (default_txtalign) {
1787                     case TXA_RIGHT:
1788                         prt_fctn = 'r';
1789                         break;
1790                     case TXA_CENTER:
1791                         prt_fctn = 'c';
1792                         break;
1793                     case TXA_JUSTIFIED:
1794                         prt_fctn = 'j';
1795                         break;
1796                     default:
1797                         prt_fctn = 'l';
1798                         break;
1799                     }
1800                 }
1801                 /* is it time to place the legends ? */
1802                 if (fill > legendwidth) {
1803                     if (leg_c > 1) {
1804                         /* go back one */
1805                         i--;
1806                         fill = fill_last;
1807                         leg_c--;
1808                     }
1809                 }
1810                 if (leg_c == 1 && prt_fctn == 'j') {
1811                     prt_fctn = 'l';
1812                 }
1813             }
1814
1815             if (prt_fctn != '\0') {
1816                 leg_x = border;
1817                 if (leg_c >= 2 && prt_fctn == 'j') {
1818                     glue = (double)(legendwidth - fill) / (double)(leg_c - 1);
1819                 } else {
1820                     glue = 0;
1821                 }
1822                 if (prt_fctn == 'c')
1823                     leg_x = (double)(legendwidth - fill) / 2.0;
1824                 if (prt_fctn == 'r')
1825                     leg_x = legendwidth - fill - border;
1826                 for (ii = mark; ii <= i; ii++) {
1827                     if (im->gdes[ii].legend[0] == '\0')
1828                         continue;   /* skip empty legends */
1829                     im->gdes[ii].leg_x = leg_x;
1830                     im->gdes[ii].leg_y = leg_y + border;
1831                     leg_x +=
1832                         (double)gfx_get_text_width(im, leg_x,
1833                                            im->
1834                                            text_prop
1835                                            [TEXT_PROP_LEGEND].
1836                                            font_desc,
1837                                            im->tabwidth, im->gdes[ii].legend)
1838                         +(double)legspace[ii]
1839                         + glue;
1840                 }
1841                 leg_y_prev = leg_y;
1842                 if (leg_x > border || prt_fctn == 's')
1843                     leg_y += im->text_prop[TEXT_PROP_LEGEND].size * 1.8;
1844                 if (prt_fctn == 's')
1845                     leg_y -= im->text_prop[TEXT_PROP_LEGEND].size;
1846
1847                 if(calc_width && (fill > legendwidth)){
1848                     legendwidth = fill;
1849                 }
1850                 fill = 0;
1851                 leg_c = 0;
1852                 mark = ii;
1853             }
1854
1855             if(calc_width){
1856                 strcpy(im->gdes[i].legend, saved_legend);
1857             }
1858         }
1859
1860         if(calc_width){
1861             im->legendwidth = legendwidth + 2 * border;
1862         }
1863         else{
1864             im->legendheight = leg_y + border * 0.6;
1865         }
1866         free(legspace);
1867     }
1868     return 0;
1869 }
1870
1871 /* create a grid on the graph. it determines what to do
1872    from the values of xsize, start and end */
1873
1874 /* the xaxis labels are determined from the number of seconds per pixel
1875    in the requested graph */
1876
1877 int calc_horizontal_grid(
1878     image_desc_t
1879     *im)
1880 {
1881     double    range;
1882     double    scaledrange;
1883     int       pixel, i;
1884     int       gridind = 0;
1885     int       decimals, fractionals;
1886
1887     im->ygrid_scale.labfact = 2;
1888     range = im->maxval - im->minval;
1889     scaledrange = range / im->magfact;
1890     /* does the scale of this graph make it impossible to put lines
1891        on it? If so, give up. */
1892     if (isnan(scaledrange)) {
1893         return 0;
1894     }
1895
1896     /* find grid spaceing */
1897     pixel = 1;
1898     if (isnan(im->ygridstep)) {
1899         if (im->extra_flags & ALTYGRID) {
1900             /* find the value with max number of digits. Get number of digits */
1901             decimals =
1902                 ceil(log10
1903                      (max(fabs(im->maxval), fabs(im->minval)) *
1904                       im->viewfactor / im->magfact));
1905             if (decimals <= 0)  /* everything is small. make place for zero */
1906                 decimals = 1;
1907             im->ygrid_scale.gridstep =
1908                 pow((double) 10,
1909                     floor(log10(range * im->viewfactor / im->magfact))) /
1910                 im->viewfactor * im->magfact;
1911             if (im->ygrid_scale.gridstep == 0)  /* range is one -> 0.1 is reasonable scale */
1912                 im->ygrid_scale.gridstep = 0.1;
1913             /* should have at least 5 lines but no more then 15 */
1914             if (range / im->ygrid_scale.gridstep < 5
1915                 && im->ygrid_scale.gridstep >= 30)
1916                 im->ygrid_scale.gridstep /= 10;
1917             if (range / im->ygrid_scale.gridstep > 15)
1918                 im->ygrid_scale.gridstep *= 10;
1919             if (range / im->ygrid_scale.gridstep > 5) {
1920                 im->ygrid_scale.labfact = 1;
1921                 if (range / im->ygrid_scale.gridstep > 8
1922                     || im->ygrid_scale.gridstep <
1923                     1.8 * im->text_prop[TEXT_PROP_AXIS].size)
1924                     im->ygrid_scale.labfact = 2;
1925             } else {
1926                 im->ygrid_scale.gridstep /= 5;
1927                 im->ygrid_scale.labfact = 5;
1928             }
1929             fractionals =
1930                 floor(log10
1931                       (im->ygrid_scale.gridstep *
1932                        (double) im->ygrid_scale.labfact * im->viewfactor /
1933                        im->magfact));
1934             if (fractionals < 0) {  /* small amplitude. */
1935                 int       len = decimals - fractionals + 1;
1936
1937                 if (im->unitslength < len + 2)
1938                     im->unitslength = len + 2;
1939                 sprintf(im->ygrid_scale.labfmt,
1940                         "%%%d.%df%s", len,
1941                         -fractionals, (im->symbol != ' ' ? " %c" : ""));
1942             } else {
1943                 int       len = decimals + 1;
1944
1945                 if (im->unitslength < len + 2)
1946                     im->unitslength = len + 2;
1947                 sprintf(im->ygrid_scale.labfmt,
1948                         "%%%d.0f%s", len, (im->symbol != ' ' ? " %c" : ""));
1949             }
1950         } else {        /* classic rrd grid */
1951             for (i = 0; ylab[i].grid > 0; i++) {
1952                 pixel = im->ysize / (scaledrange / ylab[i].grid);
1953                 gridind = i;
1954                 if (pixel >= 5)
1955                     break;
1956             }
1957
1958             for (i = 0; i < 4; i++) {
1959                 if (pixel * ylab[gridind].lfac[i] >=
1960                     1.8 * im->text_prop[TEXT_PROP_AXIS].size) {
1961                     im->ygrid_scale.labfact = ylab[gridind].lfac[i];
1962                     break;
1963                 }
1964             }
1965
1966             im->ygrid_scale.gridstep = ylab[gridind].grid * im->magfact;
1967         }
1968     } else {
1969         im->ygrid_scale.gridstep = im->ygridstep;
1970         im->ygrid_scale.labfact = im->ylabfact;
1971     }
1972     return 1;
1973 }
1974
1975 int draw_horizontal_grid(
1976     image_desc_t
1977     *im)
1978 {
1979     int       i;
1980     double    scaledstep;
1981     char      graph_label[100];
1982     int       nlabels = 0;
1983     double    X0 = im->xorigin;
1984     double    X1 = im->xorigin + im->xsize;
1985     int       sgrid = (int) (im->minval / im->ygrid_scale.gridstep - 1);
1986     int       egrid = (int) (im->maxval / im->ygrid_scale.gridstep + 1);
1987     double    MaxY;
1988     double second_axis_magfact = 0;
1989     char *second_axis_symb = "";
1990
1991     scaledstep =
1992         im->ygrid_scale.gridstep /
1993         (double) im->magfact * (double) im->viewfactor;
1994     MaxY = scaledstep * (double) egrid;
1995     for (i = sgrid; i <= egrid; i++) {
1996         double    Y0 = ytr(im,
1997                            im->ygrid_scale.gridstep * i);
1998         double    YN = ytr(im,
1999                            im->ygrid_scale.gridstep * (i + 1));
2000
2001         if (floor(Y0 + 0.5) >=
2002             im->yorigin - im->ysize && floor(Y0 + 0.5) <= im->yorigin) {
2003             /* Make sure at least 2 grid labels are shown, even if it doesn't agree
2004                with the chosen settings. Add a label if required by settings, or if
2005                there is only one label so far and the next grid line is out of bounds. */
2006             if (i % im->ygrid_scale.labfact == 0
2007                 || (nlabels == 1
2008                     && (YN < im->yorigin - im->ysize || YN > im->yorigin))) {
2009                 if (im->symbol == ' ') {
2010                     if (im->extra_flags & ALTYGRID) {
2011                         sprintf(graph_label,
2012                                 im->ygrid_scale.labfmt,
2013                                 scaledstep * (double) i);
2014                     } else {
2015                         if (MaxY < 10) {
2016                             sprintf(graph_label, "%4.1f",
2017                                     scaledstep * (double) i);
2018                         } else {
2019                             sprintf(graph_label, "%4.0f",
2020                                     scaledstep * (double) i);
2021                         }
2022                     }
2023                 } else {
2024                     char      sisym = (i == 0 ? ' ' : im->symbol);
2025
2026                     if (im->extra_flags & ALTYGRID) {
2027                         sprintf(graph_label,
2028                                 im->ygrid_scale.labfmt,
2029                                 scaledstep * (double) i, sisym);
2030                     } else {
2031                         if (MaxY < 10) {
2032                             sprintf(graph_label, "%4.1f %c",
2033                                     scaledstep * (double) i, sisym);
2034                         } else {
2035                             sprintf(graph_label, "%4.0f %c",
2036                                     scaledstep * (double) i, sisym);
2037                         }
2038                     }
2039                 }
2040                 nlabels++;
2041                 if (im->second_axis_scale != 0){
2042                         char graph_label_right[100];
2043                         double sval = im->ygrid_scale.gridstep*(double)i*im->second_axis_scale+im->second_axis_shift;
2044                         if (im->second_axis_format[0] == '\0'){
2045                             if (!second_axis_magfact){
2046                                 double dummy = im->ygrid_scale.gridstep*(double)(sgrid+egrid)/2.0*im->second_axis_scale+im->second_axis_shift;
2047                                 auto_scale(im,&dummy,&second_axis_symb,&second_axis_magfact);
2048                             }
2049                             sval /= second_axis_magfact;
2050
2051                             if(MaxY < 10) {
2052                                 sprintf(graph_label_right,"%5.1f %s",sval,second_axis_symb);
2053                             } else {
2054                                 sprintf(graph_label_right,"%5.0f %s",sval,second_axis_symb);
2055                             }
2056                         }
2057                         else {
2058                            sprintf(graph_label_right,im->second_axis_format,sval);
2059                         }
2060                         gfx_text ( im,
2061                                X1+7, Y0,
2062                                im->graph_col[GRC_FONT],
2063                                im->text_prop[TEXT_PROP_AXIS].font_desc,
2064                                im->tabwidth,0.0, GFX_H_LEFT, GFX_V_CENTER,
2065                                graph_label_right );
2066                 }
2067
2068                 gfx_text(im,
2069                          X0 -
2070                          im->
2071                          text_prop[TEXT_PROP_AXIS].
2072                          size, Y0,
2073                          im->graph_col[GRC_FONT],
2074                          im->
2075                          text_prop[TEXT_PROP_AXIS].
2076                          font_desc,
2077                          im->tabwidth, 0.0,
2078                          GFX_H_RIGHT, GFX_V_CENTER, graph_label);
2079                 gfx_line(im, X0 - 2, Y0, X0, Y0,
2080                          MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2081                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2082                          MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2083                 gfx_dashed_line(im, X0 - 2, Y0,
2084                                 X1 + 2, Y0,
2085                                 MGRIDWIDTH,
2086                                 im->
2087                                 graph_col
2088                                 [GRC_MGRID],
2089                                 im->grid_dash_on, im->grid_dash_off);
2090             } else if (!(im->extra_flags & NOMINOR)) {
2091                 gfx_line(im,
2092                          X0 - 2, Y0,
2093                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2094                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2095                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2096                 gfx_dashed_line(im, X0 - 1, Y0,
2097                                 X1 + 1, Y0,
2098                                 GRIDWIDTH,
2099                                 im->
2100                                 graph_col[GRC_GRID],
2101                                 im->grid_dash_on, im->grid_dash_off);
2102             }
2103         }
2104     }
2105     return 1;
2106 }
2107
2108 /* this is frexp for base 10 */
2109 double    frexp10(
2110     double,
2111     double *);
2112 double frexp10(
2113     double x,
2114     double *e)
2115 {
2116     double    mnt;
2117     int       iexp;
2118
2119     iexp = floor(log((double)fabs(x)) / log((double)10));
2120     mnt = x / pow(10.0, iexp);
2121     if (mnt >= 10.0) {
2122         iexp++;
2123         mnt = x / pow(10.0, iexp);
2124     }
2125     *e = iexp;
2126     return mnt;
2127 }
2128
2129
2130 /* logaritmic horizontal grid */
2131 int horizontal_log_grid(
2132     image_desc_t
2133     *im)
2134 {
2135     double    yloglab[][10] = {
2136         {
2137          1.0, 10., 0.0, 0.0, 0.0, 0.0, 0.0,
2138          0.0, 0.0, 0.0}, {
2139                           1.0, 5.0, 10., 0.0, 0.0, 0.0, 0.0,
2140                           0.0, 0.0, 0.0}, {
2141                                            1.0, 2.0, 5.0, 7.0, 10., 0.0, 0.0,
2142                                            0.0, 0.0, 0.0}, {
2143                                                             1.0, 2.0, 4.0,
2144                                                             6.0, 8.0, 10.,
2145                                                             0.0,
2146                                                             0.0, 0.0, 0.0}, {
2147                                                                              1.0,
2148                                                                              2.0,
2149                                                                              3.0,
2150                                                                              4.0,
2151                                                                              5.0,
2152                                                                              6.0,
2153                                                                              7.0,
2154                                                                              8.0,
2155                                                                              9.0,
2156                                                                              10.},
2157         {
2158          0, 0, 0, 0, 0, 0, 0, 0, 0, 0}  /* last line */
2159     };
2160     int       i, j, val_exp, min_exp;
2161     double    nex;      /* number of decades in data */
2162     double    logscale; /* scale in logarithmic space */
2163     int       exfrac = 1;   /* decade spacing */
2164     int       mid = -1; /* row in yloglab for major grid */
2165     double    mspac;    /* smallest major grid spacing (pixels) */
2166     int       flab;     /* first value in yloglab to use */
2167     double    value, tmp, pre_value;
2168     double    X0, X1, Y0;
2169     char      graph_label[100];
2170
2171     nex = log10(im->maxval / im->minval);
2172     logscale = im->ysize / nex;
2173     /* major spacing for data with high dynamic range */
2174     while (logscale * exfrac < 3 * im->text_prop[TEXT_PROP_LEGEND].size) {
2175         if (exfrac == 1)
2176             exfrac = 3;
2177         else
2178             exfrac += 3;
2179     }
2180
2181     /* major spacing for less dynamic data */
2182     do {
2183         /* search best row in yloglab */
2184         mid++;
2185         for (i = 0; yloglab[mid][i + 1] < 10.0; i++);
2186         mspac = logscale * log10(10.0 / yloglab[mid][i]);
2187     }
2188     while (mspac >
2189            2 * im->text_prop[TEXT_PROP_LEGEND].size && yloglab[mid][0] > 0);
2190     if (mid)
2191         mid--;
2192     /* find first value in yloglab */
2193     for (flab = 0;
2194          yloglab[mid][flab] < 10
2195          && frexp10(im->minval, &tmp) > yloglab[mid][flab]; flab++);
2196     if (yloglab[mid][flab] == 10.0) {
2197         tmp += 1.0;
2198         flab = 0;
2199     }
2200     val_exp = tmp;
2201     if (val_exp % exfrac)
2202         val_exp += abs(-val_exp % exfrac);
2203     X0 = im->xorigin;
2204     X1 = im->xorigin + im->xsize;
2205     /* draw grid */
2206     pre_value = DNAN;
2207     while (1) {
2208
2209         value = yloglab[mid][flab] * pow(10.0, val_exp);
2210         if (AlmostEqual2sComplement(value, pre_value, 4))
2211             break;      /* it seems we are not converging */
2212         pre_value = value;
2213         Y0 = ytr(im, value);
2214         if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2215             break;
2216         /* major grid line */
2217         gfx_line(im,
2218                  X0 - 2, Y0, X0, Y0, MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2219         gfx_line(im, X1, Y0, X1 + 2, Y0,
2220                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2221         gfx_dashed_line(im, X0 - 2, Y0,
2222                         X1 + 2, Y0,
2223                         MGRIDWIDTH,
2224                         im->
2225                         graph_col
2226                         [GRC_MGRID], im->grid_dash_on, im->grid_dash_off);
2227         /* label */
2228         if (im->extra_flags & FORCE_UNITS_SI) {
2229             int       scale;
2230             double    pvalue;
2231             char      symbol;
2232
2233             scale = floor(val_exp / 3.0);
2234             if (value >= 1.0)
2235                 pvalue = pow(10.0, val_exp % 3);
2236             else
2237                 pvalue = pow(10.0, ((val_exp + 1) % 3) + 2);
2238             pvalue *= yloglab[mid][flab];
2239             if (((scale + si_symbcenter) < (int) sizeof(si_symbol))
2240                 && ((scale + si_symbcenter) >= 0))
2241                 symbol = si_symbol[scale + si_symbcenter];
2242             else
2243                 symbol = '?';
2244             sprintf(graph_label, "%3.0f %c", pvalue, symbol);
2245         } else {
2246             sprintf(graph_label, "%3.0e", value);
2247         }
2248         if (im->second_axis_scale != 0){
2249                 char graph_label_right[100];
2250                 double sval = value*im->second_axis_scale+im->second_axis_shift;
2251                 if (im->second_axis_format[0] == '\0'){
2252                         if (im->extra_flags & FORCE_UNITS_SI) {
2253                                 double mfac = 1;
2254                                 char   *symb = "";
2255                                 auto_scale(im,&sval,&symb,&mfac);
2256                                 sprintf(graph_label_right,"%4.0f %s", sval,symb);
2257                         }
2258                         else {
2259                                 sprintf(graph_label_right,"%3.0e", sval);
2260                         }
2261                 }
2262                 else {
2263                       sprintf(graph_label_right,im->second_axis_format,sval);
2264                 }
2265
2266                 gfx_text ( im,
2267                                X1+7, Y0,
2268                                im->graph_col[GRC_FONT],
2269                                im->text_prop[TEXT_PROP_AXIS].font_desc,
2270                                im->tabwidth,0.0, GFX_H_LEFT, GFX_V_CENTER,
2271                                graph_label_right );
2272         }
2273
2274         gfx_text(im,
2275                  X0 -
2276                  im->
2277                  text_prop[TEXT_PROP_AXIS].
2278                  size, Y0,
2279                  im->graph_col[GRC_FONT],
2280                  im->
2281                  text_prop[TEXT_PROP_AXIS].
2282                  font_desc,
2283                  im->tabwidth, 0.0,
2284                  GFX_H_RIGHT, GFX_V_CENTER, graph_label);
2285         /* minor grid */
2286         if (mid < 4 && exfrac == 1) {
2287             /* find first and last minor line behind current major line
2288              * i is the first line and j tha last */
2289             if (flab == 0) {
2290                 min_exp = val_exp - 1;
2291                 for (i = 1; yloglab[mid][i] < 10.0; i++);
2292                 i = yloglab[mid][i - 1] + 1;
2293                 j = 10;
2294             } else {
2295                 min_exp = val_exp;
2296                 i = yloglab[mid][flab - 1] + 1;
2297                 j = yloglab[mid][flab];
2298             }
2299
2300             /* draw minor lines below current major line */
2301             for (; i < j; i++) {
2302
2303                 value = i * pow(10.0, min_exp);
2304                 if (value < im->minval)
2305                     continue;
2306                 Y0 = ytr(im, value);
2307                 if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2308                     break;
2309                 /* draw lines */
2310                 gfx_line(im,
2311                          X0 - 2, Y0,
2312                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2313                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2314                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2315                 gfx_dashed_line(im, X0 - 1, Y0,
2316                                 X1 + 1, Y0,
2317                                 GRIDWIDTH,
2318                                 im->
2319                                 graph_col[GRC_GRID],
2320                                 im->grid_dash_on, im->grid_dash_off);
2321             }
2322         } else if (exfrac > 1) {
2323             for (i = val_exp - exfrac / 3 * 2; i < val_exp; i += exfrac / 3) {
2324                 value = pow(10.0, i);
2325                 if (value < im->minval)
2326                     continue;
2327                 Y0 = ytr(im, value);
2328                 if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2329                     break;
2330                 /* draw lines */
2331                 gfx_line(im,
2332                          X0 - 2, Y0,
2333                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2334                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2335                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2336                 gfx_dashed_line(im, X0 - 1, Y0,
2337                                 X1 + 1, Y0,
2338                                 GRIDWIDTH,
2339                                 im->
2340                                 graph_col[GRC_GRID],
2341                                 im->grid_dash_on, im->grid_dash_off);
2342             }
2343         }
2344
2345         /* next decade */
2346         if (yloglab[mid][++flab] == 10.0) {
2347             flab = 0;
2348             val_exp += exfrac;
2349         }
2350     }
2351
2352     /* draw minor lines after highest major line */
2353     if (mid < 4 && exfrac == 1) {
2354         /* find first and last minor line below current major line
2355          * i is the first line and j tha last */
2356         if (flab == 0) {
2357             min_exp = val_exp - 1;
2358             for (i = 1; yloglab[mid][i] < 10.0; i++);
2359             i = yloglab[mid][i - 1] + 1;
2360             j = 10;
2361         } else {
2362             min_exp = val_exp;
2363             i = yloglab[mid][flab - 1] + 1;
2364             j = yloglab[mid][flab];
2365         }
2366
2367         /* draw minor lines below current major line */
2368         for (; i < j; i++) {
2369
2370             value = i * pow(10.0, min_exp);
2371             if (value < im->minval)
2372                 continue;
2373             Y0 = ytr(im, value);
2374             if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2375                 break;
2376             /* draw lines */
2377             gfx_line(im,
2378                      X0 - 2, Y0, X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2379             gfx_line(im, X1, Y0, X1 + 2, Y0,
2380                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2381             gfx_dashed_line(im, X0 - 1, Y0,
2382                             X1 + 1, Y0,
2383                             GRIDWIDTH,
2384                             im->
2385                             graph_col[GRC_GRID],
2386                             im->grid_dash_on, im->grid_dash_off);
2387         }
2388     }
2389     /* fancy minor gridlines */
2390     else if (exfrac > 1) {
2391         for (i = val_exp - exfrac / 3 * 2; i < val_exp; i += exfrac / 3) {
2392             value = pow(10.0, i);
2393             if (value < im->minval)
2394                 continue;
2395             Y0 = ytr(im, value);
2396             if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2397                 break;
2398             /* draw lines */
2399             gfx_line(im,
2400                      X0 - 2, Y0, X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2401             gfx_line(im, X1, Y0, X1 + 2, Y0,
2402                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2403             gfx_dashed_line(im, X0 - 1, Y0,
2404                             X1 + 1, Y0,
2405                             GRIDWIDTH,
2406                             im->
2407                             graph_col[GRC_GRID],
2408                             im->grid_dash_on, im->grid_dash_off);
2409         }
2410     }
2411
2412     return 1;
2413 }
2414
2415
2416 void vertical_grid(
2417     image_desc_t *im)
2418 {
2419     int       xlab_sel; /* which sort of label and grid ? */
2420     time_t    ti, tilab, timajor;
2421     long      factor;
2422     char      graph_label[100];
2423     double    X0, Y0, Y1;   /* points for filled graph and more */
2424     struct tm tm;
2425
2426     /* the type of time grid is determined by finding
2427        the number of seconds per pixel in the graph */
2428     if (im->xlab_user.minsec == -1) {
2429         factor = (im->end - im->start) / im->xsize;
2430         xlab_sel = 0;
2431         while (xlab[xlab_sel + 1].minsec !=
2432                -1 && xlab[xlab_sel + 1].minsec <= factor) {
2433             xlab_sel++;
2434         }               /* pick the last one */
2435         while (xlab[xlab_sel - 1].minsec ==
2436                xlab[xlab_sel].minsec
2437                && xlab[xlab_sel].length > (im->end - im->start)) {
2438             xlab_sel--;
2439         }               /* go back to the smallest size */
2440         im->xlab_user.gridtm = xlab[xlab_sel].gridtm;
2441         im->xlab_user.gridst = xlab[xlab_sel].gridst;
2442         im->xlab_user.mgridtm = xlab[xlab_sel].mgridtm;
2443         im->xlab_user.mgridst = xlab[xlab_sel].mgridst;
2444         im->xlab_user.labtm = xlab[xlab_sel].labtm;
2445         im->xlab_user.labst = xlab[xlab_sel].labst;
2446         im->xlab_user.precis = xlab[xlab_sel].precis;
2447         im->xlab_user.stst = xlab[xlab_sel].stst;
2448     }
2449
2450     /* y coords are the same for every line ... */
2451     Y0 = im->yorigin;
2452     Y1 = im->yorigin - im->ysize;
2453     /* paint the minor grid */
2454     if (!(im->extra_flags & NOMINOR)) {
2455         for (ti = find_first_time(im->start,
2456                                   im->
2457                                   xlab_user.
2458                                   gridtm,
2459                                   im->
2460                                   xlab_user.
2461                                   gridst),
2462              timajor =
2463              find_first_time(im->start,
2464                              im->xlab_user.
2465                              mgridtm,
2466                              im->xlab_user.
2467                              mgridst);
2468              ti < im->end;
2469              ti =
2470              find_next_time(ti, im->xlab_user.gridtm, im->xlab_user.gridst)
2471             ) {
2472             /* are we inside the graph ? */
2473             if (ti < im->start || ti > im->end)
2474                 continue;
2475             while (timajor < ti) {
2476                 timajor = find_next_time(timajor,
2477                                          im->
2478                                          xlab_user.
2479                                          mgridtm, im->xlab_user.mgridst);
2480             }
2481             if (ti == timajor)
2482                 continue;   /* skip as falls on major grid line */
2483             X0 = xtr(im, ti);
2484             gfx_line(im, X0, Y1 - 2, X0, Y1,
2485                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2486             gfx_line(im, X0, Y0, X0, Y0 + 2,
2487                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2488             gfx_dashed_line(im, X0, Y0 + 1, X0,
2489                             Y1 - 1, GRIDWIDTH,
2490                             im->
2491                             graph_col[GRC_GRID],
2492                             im->grid_dash_on, im->grid_dash_off);
2493         }
2494     }
2495
2496     /* paint the major grid */
2497     for (ti = find_first_time(im->start,
2498                               im->
2499                               xlab_user.
2500                               mgridtm,
2501                               im->
2502                               xlab_user.
2503                               mgridst);
2504          ti < im->end;
2505          ti = find_next_time(ti, im->xlab_user.mgridtm, im->xlab_user.mgridst)
2506         ) {
2507         /* are we inside the graph ? */
2508         if (ti < im->start || ti > im->end)
2509             continue;
2510         X0 = xtr(im, ti);
2511         gfx_line(im, X0, Y1 - 2, X0, Y1,
2512                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2513         gfx_line(im, X0, Y0, X0, Y0 + 3,
2514                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2515         gfx_dashed_line(im, X0, Y0 + 3, X0,
2516                         Y1 - 2, MGRIDWIDTH,
2517                         im->
2518                         graph_col
2519                         [GRC_MGRID], im->grid_dash_on, im->grid_dash_off);
2520     }
2521     /* paint the labels below the graph */
2522     for (ti =
2523          find_first_time(im->start -
2524                          im->xlab_user.
2525                          precis / 2,
2526                          im->xlab_user.
2527                          labtm,
2528                          im->xlab_user.
2529                          labst);
2530          ti <=
2531          im->end -
2532          im->xlab_user.precis / 2;
2533          ti = find_next_time(ti, im->xlab_user.labtm, im->xlab_user.labst)
2534         ) {
2535         tilab = ti + im->xlab_user.precis / 2;  /* correct time for the label */
2536         /* are we inside the graph ? */
2537         if (tilab < im->start || tilab > im->end)
2538             continue;
2539 #if HAVE_STRFTIME
2540         localtime_r(&tilab, &tm);
2541         strftime(graph_label, 99, im->xlab_user.stst, &tm);
2542 #else
2543 # error "your libc has no strftime I guess we'll abort the exercise here."
2544 #endif
2545         gfx_text(im,
2546                  xtr(im, tilab),
2547                  Y0 + 3,
2548                  im->graph_col[GRC_FONT],
2549                  im->
2550                  text_prop[TEXT_PROP_AXIS].
2551                  font_desc,
2552                  im->tabwidth, 0.0,
2553                  GFX_H_CENTER, GFX_V_TOP, graph_label);
2554     }
2555
2556 }
2557
2558
2559 void axis_paint(
2560     image_desc_t *im)
2561 {
2562     /* draw x and y axis */
2563     /* gfx_line ( im->canvas, im->xorigin+im->xsize,im->yorigin,
2564        im->xorigin+im->xsize,im->yorigin-im->ysize,
2565        GRIDWIDTH, im->graph_col[GRC_AXIS]);
2566
2567        gfx_line ( im->canvas, im->xorigin,im->yorigin-im->ysize,
2568        im->xorigin+im->xsize,im->yorigin-im->ysize,
2569        GRIDWIDTH, im->graph_col[GRC_AXIS]); */
2570
2571     gfx_line(im, im->xorigin - 4,
2572              im->yorigin,
2573              im->xorigin + im->xsize +
2574              4, im->yorigin, MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2575     gfx_line(im, im->xorigin,
2576              im->yorigin + 4,
2577              im->xorigin,
2578              im->yorigin - im->ysize -
2579              4, MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2580     /* arrow for X and Y axis direction */
2581     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 */
2582                  im->graph_col[GRC_ARROW]);
2583     gfx_close_path(im);
2584     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 */
2585                  im->graph_col[GRC_ARROW]);
2586     gfx_close_path(im);
2587     if (im->second_axis_scale != 0){
2588        gfx_line ( im, im->xorigin+im->xsize,im->yorigin+4,
2589                          im->xorigin+im->xsize,im->yorigin-im->ysize-4,
2590                          MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2591        gfx_new_area ( im,
2592                    im->xorigin+im->xsize-2,  im->yorigin-im->ysize-2,
2593                    im->xorigin+im->xsize+3,  im->yorigin-im->ysize-2,
2594                    im->xorigin+im->xsize,    im->yorigin-im->ysize-7, /* LINEOFFSET */
2595                    im->graph_col[GRC_ARROW]);
2596        gfx_close_path(im);
2597     }
2598
2599 }
2600
2601 void grid_paint(
2602     image_desc_t *im)
2603 {
2604     long      i;
2605     int       res = 0;
2606     double    X0, Y0;   /* points for filled graph and more */
2607     struct gfx_color_t water_color;
2608
2609     if (im->draw_3d_border > 0) {
2610             /* draw 3d border */
2611             i = im->draw_3d_border;
2612             gfx_new_area(im, 0, im->yimg,
2613                          i, im->yimg - i, i, i, im->graph_col[GRC_SHADEA]);
2614             gfx_add_point(im, im->ximg - i, i);
2615             gfx_add_point(im, im->ximg, 0);
2616             gfx_add_point(im, 0, 0);
2617             gfx_close_path(im);
2618             gfx_new_area(im, i, im->yimg - i,
2619                          im->ximg - i,
2620                          im->yimg - i, im->ximg - i, i, im->graph_col[GRC_SHADEB]);
2621             gfx_add_point(im, im->ximg, 0);
2622             gfx_add_point(im, im->ximg, im->yimg);
2623             gfx_add_point(im, 0, im->yimg);
2624             gfx_close_path(im);
2625     }
2626     if (im->draw_x_grid == 1)
2627         vertical_grid(im);
2628     if (im->draw_y_grid == 1) {
2629         if (im->logarithmic) {
2630             res = horizontal_log_grid(im);
2631         } else {
2632             res = draw_horizontal_grid(im);
2633         }
2634
2635         /* dont draw horizontal grid if there is no min and max val */
2636         if (!res) {
2637             char     *nodata = "No Data found";
2638
2639             gfx_text(im, im->ximg / 2,
2640                      (2 * im->yorigin -
2641                       im->ysize) / 2,
2642                      im->graph_col[GRC_FONT],
2643                      im->
2644                      text_prop[TEXT_PROP_AXIS].
2645                      font_desc,
2646                      im->tabwidth, 0.0,
2647                      GFX_H_CENTER, GFX_V_CENTER, nodata);
2648         }
2649     }
2650
2651     /* yaxis unit description */
2652     if (im->ylegend[0] != '\0'){
2653         gfx_text(im,
2654                  im->xOriginLegendY+10,
2655                  im->yOriginLegendY,
2656                  im->graph_col[GRC_FONT],
2657                  im->
2658                  text_prop[TEXT_PROP_UNIT].
2659                  font_desc,
2660                  im->tabwidth,
2661                  RRDGRAPH_YLEGEND_ANGLE, GFX_H_CENTER, GFX_V_CENTER, im->ylegend);
2662
2663     }
2664     if (im->second_axis_legend[0] != '\0'){
2665             gfx_text( im,
2666                   im->xOriginLegendY2+10,
2667                   im->yOriginLegendY2,
2668                   im->graph_col[GRC_FONT],
2669                   im->text_prop[TEXT_PROP_UNIT].font_desc,
2670                   im->tabwidth,
2671                   RRDGRAPH_YLEGEND_ANGLE,
2672                   GFX_H_CENTER, GFX_V_CENTER,
2673                   im->second_axis_legend);
2674     }
2675
2676     /* graph title */
2677     gfx_text(im,
2678              im->xOriginTitle, im->yOriginTitle+6,
2679              im->graph_col[GRC_FONT],
2680              im->
2681              text_prop[TEXT_PROP_TITLE].
2682              font_desc,
2683              im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_TOP, im->title);
2684     /* rrdtool 'logo' */
2685     if (!(im->extra_flags & NO_RRDTOOL_TAG)){
2686         water_color = im->graph_col[GRC_FONT];
2687         water_color.alpha = 0.3;
2688         double xpos = im->legendposition == EAST ? im->xOriginLegendY : im->ximg - 4;
2689         gfx_text(im, xpos, 5,
2690                  water_color,
2691                  im->
2692                  text_prop[TEXT_PROP_WATERMARK].
2693                  font_desc, im->tabwidth,
2694                  -90, GFX_H_LEFT, GFX_V_TOP, "RRDTOOL / TOBI OETIKER");
2695     }
2696     /* graph watermark */
2697     if (im->watermark[0] != '\0') {
2698         water_color = im->graph_col[GRC_FONT];
2699         water_color.alpha = 0.3;
2700         gfx_text(im,
2701                  im->ximg / 2, im->yimg - 6,
2702                  water_color,
2703                  im->
2704                  text_prop[TEXT_PROP_WATERMARK].
2705                  font_desc, im->tabwidth, 0,
2706                  GFX_H_CENTER, GFX_V_BOTTOM, im->watermark);
2707     }
2708
2709     /* graph labels */
2710     if (!(im->extra_flags & NOLEGEND) && !(im->extra_flags & ONLY_GRAPH)) {
2711         for (i = 0; i < im->gdes_c; i++) {
2712             if (im->gdes[i].legend[0] == '\0')
2713                 continue;
2714             /* im->gdes[i].leg_y is the bottom of the legend */
2715             X0 = im->xOriginLegend + im->gdes[i].leg_x;
2716             Y0 = im->legenddirection == TOP_DOWN ? im->yOriginLegend + im->gdes[i].leg_y : im->yOriginLegend + im->legendheight - im->gdes[i].leg_y;
2717             gfx_text(im, X0, Y0,
2718                      im->graph_col[GRC_FONT],
2719                      im->
2720                      text_prop
2721                      [TEXT_PROP_LEGEND].font_desc,
2722                      im->tabwidth, 0.0,
2723                      GFX_H_LEFT, GFX_V_BOTTOM, im->gdes[i].legend);
2724             /* The legend for GRAPH items starts with "M " to have
2725                enough space for the box */
2726             if (im->gdes[i].gf != GF_PRINT &&
2727                 im->gdes[i].gf != GF_GPRINT && im->gdes[i].gf != GF_COMMENT) {
2728                 double    boxH, boxV;
2729                 double    X1, Y1;
2730
2731                 boxH = gfx_get_text_width(im, 0,
2732                                           im->
2733                                           text_prop
2734                                           [TEXT_PROP_LEGEND].
2735                                           font_desc,
2736                                           im->tabwidth, "o") * 1.2;
2737                 boxV = boxH;
2738                 /* shift the box up a bit */
2739                 Y0 -= boxV * 0.4;
2740                 if (im->gdes[i].gf == GF_HRULE) { /* [-] */
2741                         cairo_save(im->cr);
2742                         cairo_new_path(im->cr);
2743                         cairo_set_line_width(im->cr, 1.0);
2744                         gfx_line(im,
2745                                 X0, Y0 - boxV / 2,
2746                                 X0 + boxH, Y0 - boxV / 2,
2747                                 1.0, im->gdes[i].col);
2748                         gfx_close_path(im);
2749                 } else if (im->gdes[i].gf == GF_VRULE) { /* [|] */
2750                         cairo_save(im->cr);
2751                         cairo_new_path(im->cr);
2752                         cairo_set_line_width(im->cr, 1.0);
2753                         gfx_line(im,
2754                                 X0 + boxH / 2, Y0,
2755                                 X0 + boxH / 2, Y0 - boxV,
2756                                 1.0, im->gdes[i].col);
2757                         gfx_close_path(im);
2758                 } else if (im->gdes[i].gf == GF_LINE) { /* [/] */
2759                         cairo_save(im->cr);
2760                         cairo_new_path(im->cr);
2761                         cairo_set_line_width(im->cr, im->gdes[i].linewidth);
2762                         gfx_line(im,
2763                                 X0, Y0,
2764                                 X0 + boxH, Y0 - boxV,
2765                                 im->gdes[i].linewidth, im->gdes[i].col);
2766                         gfx_close_path(im);
2767                 } else {
2768                 /* make sure transparent colors show up the same way as in the graph */
2769                         gfx_new_area(im,
2770                                      X0, Y0 - boxV,
2771                                      X0, Y0, X0 + boxH, Y0, im->graph_col[GRC_BACK]);
2772                         gfx_add_point(im, X0 + boxH, Y0 - boxV);
2773                         gfx_close_path(im);
2774                         gfx_new_area(im, X0, Y0 - boxV, X0,
2775                                      Y0, X0 + boxH, Y0, im->gdes[i].col);
2776                         gfx_add_point(im, X0 + boxH, Y0 - boxV);
2777                         gfx_close_path(im);
2778                         cairo_save(im->cr);
2779                         cairo_new_path(im->cr);
2780                         cairo_set_line_width(im->cr, 1.0);
2781                         X1 = X0 + boxH;
2782                         Y1 = Y0 - boxV;
2783                         gfx_line_fit(im, &X0, &Y0);
2784                         gfx_line_fit(im, &X1, &Y1);
2785                         cairo_move_to(im->cr, X0, Y0);
2786                         cairo_line_to(im->cr, X1, Y0);
2787                         cairo_line_to(im->cr, X1, Y1);
2788                         cairo_line_to(im->cr, X0, Y1);
2789                         cairo_close_path(im->cr);
2790                         cairo_set_source_rgba(im->cr,
2791                                               im->graph_col[GRC_FRAME].red,
2792                                               im->graph_col[GRC_FRAME].green,
2793                                               im->graph_col[GRC_FRAME].blue,
2794                                               im->graph_col[GRC_FRAME].alpha);
2795                 }
2796                 if (im->gdes[i].dash) {
2797                     /* make box borders in legend dashed if the graph is dashed */
2798                     double    dashes[] = {
2799                         3.0
2800                     };
2801                     cairo_set_dash(im->cr, dashes, 1, 0.0);
2802                 }
2803                 cairo_stroke(im->cr);
2804                 cairo_restore(im->cr);
2805             }
2806         }
2807     }
2808 }
2809
2810
2811 /*****************************************************
2812  * lazy check make sure we rely need to create this graph
2813  *****************************************************/
2814
2815 int lazy_check(
2816     image_desc_t *im)
2817 {
2818     FILE     *fd = NULL;
2819     int       size = 1;
2820     struct stat imgstat;
2821
2822     if (im->lazy == 0)
2823         return 0;       /* no lazy option */
2824     if (strlen(im->graphfile) == 0)
2825         return 0;       /* inmemory option */
2826     if (stat(im->graphfile, &imgstat) != 0)
2827         return 0;       /* can't stat */
2828     /* one pixel in the existing graph is more then what we would
2829        change here ... */
2830     if (time(NULL) - imgstat.st_mtime > (im->end - im->start) / im->xsize)
2831         return 0;
2832     if ((fd = fopen(im->graphfile, "rb")) == NULL)
2833         return 0;       /* the file does not exist */
2834     switch (im->imgformat) {
2835     case IF_PNG:
2836         size = PngSize(fd, &(im->ximg), &(im->yimg));
2837         break;
2838     default:
2839         size = 1;
2840     }
2841     fclose(fd);
2842     return size;
2843 }
2844
2845
2846 int graph_size_location(
2847     image_desc_t
2848     *im,
2849     int elements)
2850 {
2851     /* The actual size of the image to draw is determined from
2852      ** several sources.  The size given on the command line is
2853      ** the graph area but we need more as we have to draw labels
2854      ** and other things outside the graph area. If the option
2855      ** --full-size-mode is selected the size defines the total
2856      ** image size and the size available for the graph is
2857      ** calculated.
2858      */
2859
2860     /** +---+-----------------------------------+
2861      ** | y |...............graph title.........|
2862      ** |   +---+-------------------------------+
2863      ** | a | y |                               |
2864      ** | x |   |                               |
2865      ** | i | a |                               |
2866      ** | s | x |       main graph area         |
2867      ** |   | i |                               |
2868      ** | t | s |                               |
2869      ** | i |   |                               |
2870      ** | t | l |                               |
2871      ** | l | b +-------------------------------+
2872      ** | e | l |       x axis labels           |
2873      ** +---+---+-------------------------------+
2874      ** |....................legends............|
2875      ** +---------------------------------------+
2876      ** |                   watermark           |
2877      ** +---------------------------------------+
2878      */
2879
2880     int       Xvertical = 0, Xvertical2 = 0, Ytitle =
2881         0, Xylabel = 0, Xmain = 0, Ymain =
2882         0, Yxlabel = 0, Xspacing = 15, Yspacing = 15, Ywatermark = 4;
2883
2884     // no legends and no the shall be plotted it's easy
2885     if (im->extra_flags & ONLY_GRAPH) {
2886         im->xorigin = 0;
2887         im->ximg = im->xsize;
2888         im->yimg = im->ysize;
2889         im->yorigin = im->ysize;
2890         ytr(im, DNAN);
2891         return 0;
2892     }
2893
2894     if(im->watermark[0] != '\0') {
2895         Ywatermark = im->text_prop[TEXT_PROP_WATERMARK].size * 2;
2896     }
2897
2898     // calculate the width of the left vertical legend
2899     if (im->ylegend[0] != '\0') {
2900         Xvertical = im->text_prop[TEXT_PROP_UNIT].size * 2;
2901     }
2902
2903     // calculate the width of the right vertical legend
2904     if (im->second_axis_legend[0] != '\0') {
2905         Xvertical2 = im->text_prop[TEXT_PROP_UNIT].size * 2;
2906     }
2907     else{
2908         Xvertical2 = Xspacing;
2909     }
2910
2911     if (im->title[0] != '\0') {
2912         /* The title is placed "inbetween" two text lines so it
2913          ** automatically has some vertical spacing.  The horizontal
2914          ** spacing is added here, on each side.
2915          */
2916         /* if necessary, reduce the font size of the title until it fits the image width */
2917         Ytitle = im->text_prop[TEXT_PROP_TITLE].size * 2.6 + 10;
2918     }
2919     else{
2920         // we have no title; get a little clearing from the top
2921         Ytitle = 1.5 * Yspacing;
2922     }
2923
2924     if (elements) {
2925         if (im->draw_x_grid) {
2926             // calculate the height of the horizontal labelling
2927             Yxlabel = im->text_prop[TEXT_PROP_AXIS].size * 2.5;
2928         }
2929         if (im->draw_y_grid || im->forceleftspace) {
2930             // calculate the width of the vertical labelling
2931             Xylabel =
2932                 gfx_get_text_width(im, 0,
2933                                    im->text_prop[TEXT_PROP_AXIS].font_desc,
2934                                    im->tabwidth, "0") * im->unitslength;
2935         }
2936     }
2937
2938     // add some space to the labelling
2939     Xylabel += Xspacing;
2940
2941     /* If the legend is printed besides the graph the width has to be
2942      ** calculated first. Placing the legend north or south of the
2943      ** graph requires the width calculation first, so the legend is
2944      ** skipped for the moment.
2945      */
2946     im->legendheight = 0;
2947     im->legendwidth = 0;
2948     if (!(im->extra_flags & NOLEGEND)) {
2949         if(im->legendposition == WEST || im->legendposition == EAST){
2950             if (leg_place(im, 1) == -1){
2951                 return -1;
2952             }
2953         }
2954     }
2955
2956     if (im->extra_flags & FULL_SIZE_MODE) {
2957
2958         /* The actual size of the image to draw has been determined by the user.
2959          ** The graph area is the space remaining after accounting for the legend,
2960          ** the watermark, the axis labels, and the title.
2961          */
2962         im->ximg = im->xsize;
2963         im->yimg = im->ysize;
2964         Xmain = im->ximg;
2965         Ymain = im->yimg;
2966
2967         /* Now calculate the total size.  Insert some spacing where
2968            desired.  im->xorigin and im->yorigin need to correspond
2969            with the lower left corner of the main graph area or, if
2970            this one is not set, the imaginary box surrounding the
2971            pie chart area. */
2972         /* Initial size calculation for the main graph area */
2973
2974         Xmain -= Xylabel;// + Xspacing;
2975         if((im->legendposition == WEST || im->legendposition == EAST) && !(im->extra_flags & NOLEGEND) ){
2976             Xmain -= im->legendwidth;// + Xspacing;
2977         }
2978         if (im->second_axis_scale != 0){
2979             Xmain -= Xylabel;
2980         }
2981         if (!(im->extra_flags & NO_RRDTOOL_TAG)){
2982             Xmain -= Xspacing;
2983         }
2984
2985         Xmain -= Xvertical + Xvertical2;
2986
2987         /* limit the remaining space to 0 */
2988         if(Xmain < 1){
2989             Xmain = 1;
2990         }
2991         im->xsize = Xmain;
2992
2993         /* Putting the legend north or south, the height can now be calculated */
2994         if (!(im->extra_flags & NOLEGEND)) {
2995             if(im->legendposition == NORTH || im->legendposition == SOUTH){
2996                 im->legendwidth = im->ximg;
2997                 if (leg_place(im, 0) == -1){
2998                     return -1;
2999                 }
3000             }
3001         }
3002
3003         if( (im->legendposition == NORTH || im->legendposition == SOUTH)  && !(im->extra_flags & NOLEGEND) ){
3004             Ymain -=  Yxlabel + im->legendheight;
3005         }
3006         else{
3007             Ymain -= Yxlabel;
3008         }
3009
3010         /* reserve space for the title *or* some padding above the graph */
3011         Ymain -= Ytitle;
3012
3013             /* reserve space for padding below the graph */
3014         if (im->extra_flags & NOLEGEND) {
3015             Ymain -= Yspacing;
3016         }
3017
3018         if (im->watermark[0] != '\0') {
3019             Ymain -= Ywatermark;
3020         }
3021         /* limit the remaining height to 0 */
3022         if(Ymain < 1){
3023             Ymain = 1;
3024         }
3025         im->ysize = Ymain;
3026     } else {            /* dimension options -width and -height refer to the dimensions of the main graph area */
3027
3028         /* The actual size of the image to draw is determined from
3029          ** several sources.  The size given on the command line is
3030          ** the graph area but we need more as we have to draw labels
3031          ** and other things outside the graph area.
3032          */
3033
3034         if (elements) {
3035             Xmain = im->xsize; // + Xspacing;
3036             Ymain = im->ysize;
3037         }
3038
3039         im->ximg = Xmain + Xylabel;
3040         if (!(im->extra_flags & NO_RRDTOOL_TAG)){
3041             im->ximg += Xspacing;
3042         }
3043
3044         if( (im->legendposition == WEST || im->legendposition == EAST) && !(im->extra_flags & NOLEGEND) ){
3045             im->ximg += im->legendwidth;// + Xspacing;
3046         }
3047         if (im->second_axis_scale != 0){
3048             im->ximg += Xylabel;
3049         }
3050
3051         im->ximg += Xvertical + Xvertical2;
3052
3053         if (!(im->extra_flags & NOLEGEND)) {
3054             if(im->legendposition == NORTH || im->legendposition == SOUTH){
3055                 im->legendwidth = im->ximg;
3056                 if (leg_place(im, 0) == -1){
3057                     return -1;
3058                 }
3059             }
3060         }
3061
3062         im->yimg = Ymain + Yxlabel;
3063         if( (im->legendposition == NORTH || im->legendposition == SOUTH)  && !(im->extra_flags & NOLEGEND) ){
3064              im->yimg += im->legendheight;
3065         }
3066
3067         /* reserve space for the title *or* some padding above the graph */
3068         if (Ytitle) {
3069             im->yimg += Ytitle;
3070         } else {
3071             im->yimg += 1.5 * Yspacing;
3072         }
3073         /* reserve space for padding below the graph */
3074         if (im->extra_flags & NOLEGEND) {
3075             im->yimg += Yspacing;
3076         }
3077
3078         if (im->watermark[0] != '\0') {
3079             im->yimg += Ywatermark;
3080         }
3081     }
3082
3083
3084     /* In case of putting the legend in west or east position the first
3085      ** legend calculation might lead to wrong positions if some items
3086      ** are not aligned on the left hand side (e.g. centered) as the
3087      ** legendwidth wight have been increased after the item was placed.
3088      ** In this case the positions have to be recalculated.
3089      */
3090     if (!(im->extra_flags & NOLEGEND)) {
3091         if(im->legendposition == WEST || im->legendposition == EAST){
3092             if (leg_place(im, 0) == -1){
3093                 return -1;
3094             }
3095         }
3096     }
3097
3098     /* After calculating all dimensions
3099      ** it is now possible to calculate
3100      ** all offsets.
3101      */
3102     switch(im->legendposition){
3103         case NORTH:
3104             im->xOriginTitle   = Xvertical + Xylabel + (im->xsize / 2);
3105             im->yOriginTitle   = 0;
3106
3107             im->xOriginLegend  = 0;
3108             im->yOriginLegend  = Ytitle;
3109
3110             im->xOriginLegendY = 0;
3111             im->yOriginLegendY = Ytitle + im->legendheight + (Ymain / 2) + Yxlabel;
3112
3113             im->xorigin        = Xvertical + Xylabel;
3114             im->yorigin        = Ytitle + im->legendheight + Ymain;
3115
3116             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3117             if (im->second_axis_scale != 0){
3118                 im->xOriginLegendY2 += Xylabel;
3119             }
3120             im->yOriginLegendY2 = Ytitle + im->legendheight + (Ymain / 2) + Yxlabel;
3121
3122             break;
3123
3124         case WEST:
3125             im->xOriginTitle   = im->legendwidth + Xvertical + Xylabel + im->xsize / 2;
3126             im->yOriginTitle   = 0;
3127
3128             im->xOriginLegend  = 0;
3129             im->yOriginLegend  = Ytitle;
3130
3131             im->xOriginLegendY = im->legendwidth;
3132             im->yOriginLegendY = Ytitle + (Ymain / 2);
3133
3134             im->xorigin        = im->legendwidth + Xvertical + Xylabel;
3135             im->yorigin        = Ytitle + Ymain;
3136
3137             im->xOriginLegendY2 = im->legendwidth + Xvertical + Xylabel + Xmain;
3138             if (im->second_axis_scale != 0){
3139                 im->xOriginLegendY2 += Xylabel;
3140             }
3141             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3142
3143             break;
3144
3145         case SOUTH:
3146             im->xOriginTitle   = Xvertical + Xylabel + im->xsize / 2;
3147             im->yOriginTitle   = 0;
3148
3149             im->xOriginLegend  = 0;
3150             im->yOriginLegend  = Ytitle + Ymain + Yxlabel;
3151
3152             im->xOriginLegendY = 0;
3153             im->yOriginLegendY = Ytitle + (Ymain / 2);
3154
3155             im->xorigin        = Xvertical + Xylabel;
3156             im->yorigin        = Ytitle + Ymain;
3157
3158             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3159             if (im->second_axis_scale != 0){
3160                 im->xOriginLegendY2 += Xylabel;
3161             }
3162             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3163
3164             break;
3165
3166         case EAST:
3167             im->xOriginTitle   = Xvertical + Xylabel + im->xsize / 2;
3168             im->yOriginTitle   = 0;
3169
3170             im->xOriginLegend  = Xvertical + Xylabel + Xmain + Xvertical2;
3171             if (im->second_axis_scale != 0){
3172                 im->xOriginLegend += Xylabel;
3173             }
3174             im->yOriginLegend  = Ytitle;
3175
3176             im->xOriginLegendY = 0;
3177             im->yOriginLegendY = Ytitle + (Ymain / 2);
3178
3179             im->xorigin        = Xvertical + Xylabel;
3180             im->yorigin        = Ytitle + Ymain;
3181
3182             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3183             if (im->second_axis_scale != 0){
3184                 im->xOriginLegendY2 += Xylabel;
3185             }
3186             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3187
3188             if (!(im->extra_flags & NO_RRDTOOL_TAG)){
3189                 im->xOriginTitle    += Xspacing;
3190                 im->xOriginLegend   += Xspacing;
3191                 im->xOriginLegendY  += Xspacing;
3192                 im->xorigin         += Xspacing;
3193                 im->xOriginLegendY2 += Xspacing;
3194             }
3195             break;
3196     }
3197
3198     xtr(im, 0);
3199     ytr(im, DNAN);
3200     return 0;
3201 }
3202
3203 static cairo_status_t cairo_output(
3204     void *closure,
3205     const unsigned char
3206     *data,
3207     unsigned int length)
3208 {
3209     image_desc_t *im = (image_desc_t*)closure;
3210
3211     im->rendered_image =
3212         (unsigned char*)realloc(im->rendered_image, im->rendered_image_size + length);
3213     if (im->rendered_image == NULL)
3214         return CAIRO_STATUS_WRITE_ERROR;
3215     memcpy(im->rendered_image + im->rendered_image_size, data, length);
3216     im->rendered_image_size += length;
3217     return CAIRO_STATUS_SUCCESS;
3218 }
3219
3220 /* draw that picture thing ... */
3221 int graph_paint(
3222     image_desc_t *im)
3223 {
3224     int       i, ii;
3225     int       lazy = lazy_check(im);
3226     double    areazero = 0.0;
3227     graph_desc_t *lastgdes = NULL;
3228     rrd_infoval_t info;
3229
3230 //    PangoFontMap *font_map = pango_cairo_font_map_get_default();
3231
3232     /* pull the data from the rrd files ... */
3233     if (data_fetch(im) == -1)
3234         return -1;
3235     /* evaluate VDEF and CDEF operations ... */
3236     if (data_calc(im) == -1)
3237         return -1;
3238     /* calculate and PRINT and GPRINT definitions. We have to do it at
3239      * this point because it will affect the length of the legends
3240      * if there are no graph elements (i==0) we stop here ...
3241      * if we are lazy, try to quit ...
3242      */
3243     i = print_calc(im);
3244     if (i < 0)
3245         return -1;
3246
3247     /* if we want and can be lazy ... quit now */
3248     if (i == 0)
3249         return 0;
3250
3251 /**************************************************************
3252  *** Calculating sizes and locations became a bit confusing ***
3253  *** so I moved this into a separate function.              ***
3254  **************************************************************/
3255     if (graph_size_location(im, i) == -1)
3256         return -1;
3257
3258     info.u_cnt = im->xorigin;
3259     grinfo_push(im, sprintf_alloc("graph_left"), RD_I_CNT, info);
3260     info.u_cnt = im->yorigin - im->ysize;
3261     grinfo_push(im, sprintf_alloc("graph_top"), RD_I_CNT, info);
3262     info.u_cnt = im->xsize;
3263     grinfo_push(im, sprintf_alloc("graph_width"), RD_I_CNT, info);
3264     info.u_cnt = im->ysize;
3265     grinfo_push(im, sprintf_alloc("graph_height"), RD_I_CNT, info);
3266     info.u_cnt = im->ximg;
3267     grinfo_push(im, sprintf_alloc("image_width"), RD_I_CNT, info);
3268     info.u_cnt = im->yimg;
3269     grinfo_push(im, sprintf_alloc("image_height"), RD_I_CNT, info);
3270     info.u_cnt = im->start;
3271     grinfo_push(im, sprintf_alloc("graph_start"), RD_I_CNT, info);
3272     info.u_cnt = im->end;
3273     grinfo_push(im, sprintf_alloc("graph_end"), RD_I_CNT, info);
3274
3275     /* if we want and can be lazy ... quit now */
3276     if (lazy)
3277         return 0;
3278
3279     /* get actual drawing data and find min and max values */
3280     if (data_proc(im) == -1)
3281         return -1;
3282     if (!im->logarithmic) {
3283         si_unit(im);
3284     }
3285
3286     /* identify si magnitude Kilo, Mega Giga ? */
3287     if (!im->rigid && !im->logarithmic)
3288         expand_range(im);   /* make sure the upper and lower limit are
3289                                sensible values */
3290
3291     info.u_val = im->minval;
3292     grinfo_push(im, sprintf_alloc("value_min"), RD_I_VAL, info);
3293     info.u_val = im->maxval;
3294     grinfo_push(im, sprintf_alloc("value_max"), RD_I_VAL, info);
3295
3296
3297     if (!calc_horizontal_grid(im))
3298         return -1;
3299     /* reset precalc */
3300     ytr(im, DNAN);
3301 /*   if (im->gridfit)
3302      apply_gridfit(im); */
3303     /* the actual graph is created by going through the individual
3304        graph elements and then drawing them */
3305     cairo_surface_destroy(im->surface);
3306     switch (im->imgformat) {
3307     case IF_PNG:
3308         im->surface =
3309             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
3310                                        im->ximg * im->zoom,
3311                                        im->yimg * im->zoom);
3312         break;
3313     case IF_PDF:
3314         im->gridfit = 0;
3315         im->surface = strlen(im->graphfile)
3316             ? cairo_pdf_surface_create(im->graphfile, im->ximg * im->zoom,
3317                                        im->yimg * im->zoom)
3318             : cairo_pdf_surface_create_for_stream
3319             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3320         break;
3321     case IF_EPS:
3322         im->gridfit = 0;
3323         im->surface = strlen(im->graphfile)
3324             ?
3325             cairo_ps_surface_create(im->graphfile, im->ximg * im->zoom,
3326                                     im->yimg * im->zoom)
3327             : cairo_ps_surface_create_for_stream
3328             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3329         break;
3330     case IF_SVG:
3331         im->gridfit = 0;
3332         im->surface = strlen(im->graphfile)
3333             ?
3334             cairo_svg_surface_create(im->
3335                                      graphfile,
3336                                      im->ximg * im->zoom, im->yimg * im->zoom)
3337             : cairo_svg_surface_create_for_stream
3338             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3339         cairo_svg_surface_restrict_to_version
3340             (im->surface, CAIRO_SVG_VERSION_1_1);
3341         break;
3342     };
3343     cairo_destroy(im->cr);
3344     im->cr = cairo_create(im->surface);
3345     cairo_set_antialias(im->cr, im->graph_antialias);
3346     cairo_scale(im->cr, im->zoom, im->zoom);
3347 //    pango_cairo_font_map_set_resolution(PANGO_CAIRO_FONT_MAP(font_map), 100);
3348     gfx_new_area(im, 0, 0, 0, im->yimg,
3349                  im->ximg, im->yimg, im->graph_col[GRC_BACK]);
3350     gfx_add_point(im, im->ximg, 0);
3351     gfx_close_path(im);
3352     gfx_new_area(im, im->xorigin,
3353                  im->yorigin,
3354                  im->xorigin +
3355                  im->xsize, im->yorigin,
3356                  im->xorigin +
3357                  im->xsize,
3358                  im->yorigin - im->ysize, im->graph_col[GRC_CANVAS]);
3359     gfx_add_point(im, im->xorigin, im->yorigin - im->ysize);
3360     gfx_close_path(im);
3361     cairo_rectangle(im->cr, im->xorigin, im->yorigin - im->ysize - 1.0,
3362                     im->xsize, im->ysize + 2.0);
3363     cairo_clip(im->cr);
3364     if (im->minval > 0.0)
3365         areazero = im->minval;
3366     if (im->maxval < 0.0)
3367         areazero = im->maxval;
3368     for (i = 0; i < im->gdes_c; i++) {
3369         switch (im->gdes[i].gf) {
3370         case GF_CDEF:
3371         case GF_VDEF:
3372         case GF_DEF:
3373         case GF_PRINT:
3374         case GF_GPRINT:
3375         case GF_COMMENT:
3376         case GF_TEXTALIGN:
3377         case GF_HRULE:
3378         case GF_VRULE:
3379         case GF_XPORT:
3380         case GF_SHIFT:
3381             break;
3382         case GF_TICK:
3383             for (ii = 0; ii < im->xsize; ii++) {
3384                 if (!isnan(im->gdes[i].p_data[ii])
3385                     && im->gdes[i].p_data[ii] != 0.0) {
3386                     if (im->gdes[i].yrule > 0) {
3387                         gfx_line(im,
3388                                  im->xorigin + ii,
3389                                  im->yorigin + 1.0,
3390                                  im->xorigin + ii,
3391                                  im->yorigin -
3392                                  im->gdes[i].yrule *
3393                                  im->ysize, 1.0, im->gdes[i].col);
3394                     } else if (im->gdes[i].yrule < 0) {
3395                         gfx_line(im,
3396                                  im->xorigin + ii,
3397                                  im->yorigin - im->ysize - 1.0,
3398                                  im->xorigin + ii,
3399                                  im->yorigin - im->ysize -
3400                                                 im->gdes[i].
3401                                                 yrule *
3402                                  im->ysize, 1.0, im->gdes[i].col);
3403                     }
3404                 }
3405             }
3406             break;
3407         case GF_LINE:
3408         case GF_AREA:
3409             /* fix data points at oo and -oo */
3410             for (ii = 0; ii < im->xsize; ii++) {
3411                 if (isinf(im->gdes[i].p_data[ii])) {
3412                     if (im->gdes[i].p_data[ii] > 0) {
3413                         im->gdes[i].p_data[ii] = im->maxval;
3414                     } else {
3415                         im->gdes[i].p_data[ii] = im->minval;
3416                     }
3417
3418                 }
3419             }           /* for */
3420
3421             /* *******************************************************
3422                a           ___. (a,t)
3423                |   |    ___
3424                ____|   |   |   |
3425                |       |___|
3426                -------|--t-1--t--------------------------------
3427
3428                if we know the value at time t was a then
3429                we draw a square from t-1 to t with the value a.
3430
3431                ********************************************************* */
3432             if (im->gdes[i].col.alpha != 0.0) {
3433                 /* GF_LINE and friend */
3434                 if (im->gdes[i].gf == GF_LINE) {
3435                     double    last_y = 0.0;
3436                     int       draw_on = 0;
3437
3438                     cairo_save(im->cr);
3439                     cairo_new_path(im->cr);
3440                     cairo_set_line_width(im->cr, im->gdes[i].linewidth);
3441                     if (im->gdes[i].dash) {
3442                         cairo_set_dash(im->cr,
3443                                        im->gdes[i].p_dashes,
3444                                        im->gdes[i].ndash, im->gdes[i].offset);
3445                     }
3446
3447                     for (ii = 1; ii < im->xsize; ii++) {
3448                         if (isnan(im->gdes[i].p_data[ii])
3449                             || (im->slopemode == 1
3450                                 && isnan(im->gdes[i].p_data[ii - 1]))) {
3451                             draw_on = 0;
3452                             continue;
3453                         }
3454                         if (draw_on == 0) {
3455                             last_y = ytr(im, im->gdes[i].p_data[ii]);
3456                             if (im->slopemode == 0) {
3457                                 double    x = ii - 1 + im->xorigin;
3458                                 double    y = last_y;
3459
3460                                 gfx_line_fit(im, &x, &y);
3461                                 cairo_move_to(im->cr, x, y);
3462                                 x = ii + im->xorigin;
3463                                 y = last_y;
3464                                 gfx_line_fit(im, &x, &y);
3465                                 cairo_line_to(im->cr, x, y);
3466                             } else {
3467                                 double    x = ii - 1 + im->xorigin;
3468                                 double    y =
3469                                     ytr(im, im->gdes[i].p_data[ii - 1]);
3470                                 gfx_line_fit(im, &x, &y);
3471                                 cairo_move_to(im->cr, x, y);
3472                                 x = ii + im->xorigin;
3473                                 y = last_y;
3474                                 gfx_line_fit(im, &x, &y);
3475                                 cairo_line_to(im->cr, x, y);
3476                             }
3477                             draw_on = 1;
3478                         } else {
3479                             double    x1 = ii + im->xorigin;
3480                             double    y1 = ytr(im, im->gdes[i].p_data[ii]);
3481
3482                             if (im->slopemode == 0
3483                                 && !AlmostEqual2sComplement(y1, last_y, 4)) {
3484                                 double    x = ii - 1 + im->xorigin;
3485                                 double    y = y1;
3486
3487                                 gfx_line_fit(im, &x, &y);
3488                                 cairo_line_to(im->cr, x, y);
3489                             };
3490                             last_y = y1;
3491                             gfx_line_fit(im, &x1, &y1);
3492                             cairo_line_to(im->cr, x1, y1);
3493                         };
3494                     }
3495                     cairo_set_source_rgba(im->cr,
3496                                           im->gdes[i].
3497                                           col.red,
3498                                           im->gdes[i].
3499                                           col.green,
3500                                           im->gdes[i].
3501                                           col.blue, im->gdes[i].col.alpha);
3502                     cairo_set_line_cap(im->cr, CAIRO_LINE_CAP_ROUND);
3503                     cairo_set_line_join(im->cr, CAIRO_LINE_JOIN_ROUND);
3504                     cairo_stroke(im->cr);
3505                     cairo_restore(im->cr);
3506                 } else {
3507                     int       idxI = -1;
3508                     double   *foreY =
3509                         (double *) malloc(sizeof(double) * im->xsize * 2);
3510                     double   *foreX =
3511                         (double *) malloc(sizeof(double) * im->xsize * 2);
3512                     double   *backY =
3513                         (double *) malloc(sizeof(double) * im->xsize * 2);
3514                     double   *backX =
3515                         (double *) malloc(sizeof(double) * im->xsize * 2);
3516                     int       drawem = 0;
3517
3518                     for (ii = 0; ii <= im->xsize; ii++) {
3519                         double    ybase, ytop;
3520
3521                         if (idxI > 0 && (drawem != 0 || ii == im->xsize)) {
3522                             int       cntI = 1;
3523                             int       lastI = 0;
3524
3525                             while (cntI < idxI
3526                                    &&
3527                                    AlmostEqual2sComplement(foreY
3528                                                            [lastI],
3529                                                            foreY[cntI], 4)
3530                                    &&
3531                                    AlmostEqual2sComplement(foreY
3532                                                            [lastI],
3533                                                            foreY
3534                                                            [cntI + 1], 4)) {
3535                                 cntI++;
3536                             }
3537                             gfx_new_area(im,
3538                                          backX[0], backY[0],
3539                                          foreX[0], foreY[0],
3540                                          foreX[cntI],
3541                                          foreY[cntI], im->gdes[i].col);
3542                             while (cntI < idxI) {
3543                                 lastI = cntI;
3544                                 cntI++;
3545                                 while (cntI < idxI
3546                                        &&
3547                                        AlmostEqual2sComplement(foreY
3548                                                                [lastI],
3549                                                                foreY[cntI], 4)
3550                                        &&
3551                                        AlmostEqual2sComplement(foreY
3552                                                                [lastI],
3553                                                                foreY
3554                                                                [cntI
3555                                                                 + 1], 4)) {
3556                                     cntI++;
3557                                 }
3558                                 gfx_add_point(im, foreX[cntI], foreY[cntI]);
3559                             }
3560                             gfx_add_point(im, backX[idxI], backY[idxI]);
3561                             while (idxI > 1) {
3562                                 lastI = idxI;
3563                                 idxI--;
3564                                 while (idxI > 1
3565                                        &&
3566                                        AlmostEqual2sComplement(backY
3567                                                                [lastI],
3568                                                                backY[idxI], 4)
3569                                        &&
3570                                        AlmostEqual2sComplement(backY
3571                                                                [lastI],
3572                                                                backY
3573                                                                [idxI
3574                                                                 - 1], 4)) {
3575                                     idxI--;
3576                                 }
3577                                 gfx_add_point(im, backX[idxI], backY[idxI]);
3578                             }
3579                             idxI = -1;
3580                             drawem = 0;
3581                             gfx_close_path(im);
3582                         }
3583                         if (drawem != 0) {
3584                             drawem = 0;
3585                             idxI = -1;
3586                         }
3587                         if (ii == im->xsize)
3588                             break;
3589                         if (im->slopemode == 0 && ii == 0) {
3590                             continue;
3591                         }
3592                         if (isnan(im->gdes[i].p_data[ii])) {
3593                             drawem = 1;
3594                             continue;
3595                         }
3596                         ytop = ytr(im, im->gdes[i].p_data[ii]);
3597                         if (lastgdes && im->gdes[i].stack) {
3598                             ybase = ytr(im, lastgdes->p_data[ii]);
3599                         } else {
3600                             ybase = ytr(im, areazero);
3601                         }
3602                         if (ybase == ytop) {
3603                             drawem = 1;
3604                             continue;
3605                         }
3606
3607                         if (ybase > ytop) {
3608                             double    extra = ytop;
3609
3610                             ytop = ybase;
3611                             ybase = extra;
3612                         }
3613                         if (im->slopemode == 0) {
3614                             backY[++idxI] = ybase - 0.2;
3615                             backX[idxI] = ii + im->xorigin - 1;
3616                             foreY[idxI] = ytop + 0.2;
3617                             foreX[idxI] = ii + im->xorigin - 1;
3618                         }
3619                         backY[++idxI] = ybase - 0.2;
3620                         backX[idxI] = ii + im->xorigin;
3621                         foreY[idxI] = ytop + 0.2;
3622                         foreX[idxI] = ii + im->xorigin;
3623                     }
3624                     /* close up any remaining area */
3625                     free(foreY);
3626                     free(foreX);
3627                     free(backY);
3628                     free(backX);
3629                 }       /* else GF_LINE */
3630             }
3631             /* if color != 0x0 */
3632             /* make sure we do not run into trouble when stacking on NaN */
3633             for (ii = 0; ii < im->xsize; ii++) {
3634                 if (isnan(im->gdes[i].p_data[ii])) {
3635                     if (lastgdes && (im->gdes[i].stack)) {
3636                         im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
3637                     } else {
3638                         im->gdes[i].p_data[ii] = areazero;
3639                     }
3640                 }
3641             }
3642             lastgdes = &(im->gdes[i]);
3643             break;
3644         case GF_STACK:
3645             rrd_set_error
3646                 ("STACK should already be turned into LINE or AREA here");
3647             return -1;
3648             break;
3649         }               /* switch */
3650     }
3651     cairo_reset_clip(im->cr);
3652
3653     /* grid_paint also does the text */
3654     if (!(im->extra_flags & ONLY_GRAPH))
3655         grid_paint(im);
3656     if (!(im->extra_flags & ONLY_GRAPH))
3657         axis_paint(im);
3658     /* the RULES are the last thing to paint ... */
3659     for (i = 0; i < im->gdes_c; i++) {
3660
3661         switch (im->gdes[i].gf) {
3662         case GF_HRULE:
3663             if (im->gdes[i].yrule >= im->minval
3664                 && im->gdes[i].yrule <= im->maxval) {
3665                 cairo_save(im->cr);
3666                 if (im->gdes[i].dash) {
3667                     cairo_set_dash(im->cr,
3668                                    im->gdes[i].p_dashes,
3669                                    im->gdes[i].ndash, im->gdes[i].offset);
3670                 }
3671                 gfx_line(im, im->xorigin,
3672                          ytr(im, im->gdes[i].yrule),
3673                          im->xorigin + im->xsize,
3674                          ytr(im, im->gdes[i].yrule), 1.0, im->gdes[i].col);
3675                 cairo_stroke(im->cr);
3676                 cairo_restore(im->cr);
3677             }
3678             break;
3679         case GF_VRULE:
3680             if (im->gdes[i].xrule >= im->start
3681                 && im->gdes[i].xrule <= im->end) {
3682                 cairo_save(im->cr);
3683                 if (im->gdes[i].dash) {
3684                     cairo_set_dash(im->cr,
3685                                    im->gdes[i].p_dashes,
3686                                    im->gdes[i].ndash, im->gdes[i].offset);
3687                 }
3688                 gfx_line(im,
3689                          xtr(im, im->gdes[i].xrule),
3690                          im->yorigin, xtr(im,
3691                                           im->
3692                                           gdes[i].
3693                                           xrule),
3694                          im->yorigin - im->ysize, 1.0, im->gdes[i].col);
3695                 cairo_stroke(im->cr);
3696                 cairo_restore(im->cr);
3697             }
3698             break;
3699         default:
3700             break;
3701         }
3702     }
3703
3704
3705     switch (im->imgformat) {
3706     case IF_PNG:
3707     {
3708         cairo_status_t status;
3709
3710         status = strlen(im->graphfile) ?
3711             cairo_surface_write_to_png(im->surface, im->graphfile)
3712             : cairo_surface_write_to_png_stream(im->surface, &cairo_output,
3713                                                 im);
3714
3715         if (status != CAIRO_STATUS_SUCCESS) {
3716             rrd_set_error("Could not save png to '%s'", im->graphfile);
3717             return 1;
3718         }
3719         break;
3720     }
3721     default:
3722         if (strlen(im->graphfile)) {
3723             cairo_show_page(im->cr);
3724         } else {
3725             cairo_surface_finish(im->surface);
3726         }
3727         break;
3728     }
3729
3730     return 0;
3731 }
3732
3733
3734 /*****************************************************
3735  * graph stuff
3736  *****************************************************/
3737
3738 int gdes_alloc(
3739     image_desc_t *im)
3740 {
3741
3742     im->gdes_c++;
3743     if ((im->gdes = (graph_desc_t *)
3744          rrd_realloc(im->gdes, (im->gdes_c)
3745                      * sizeof(graph_desc_t))) == NULL) {
3746         rrd_set_error("realloc graph_descs");
3747         return -1;
3748     }
3749
3750
3751     im->gdes[im->gdes_c - 1].step = im->step;
3752     im->gdes[im->gdes_c - 1].step_orig = im->step;
3753     im->gdes[im->gdes_c - 1].stack = 0;
3754     im->gdes[im->gdes_c - 1].linewidth = 0;
3755     im->gdes[im->gdes_c - 1].debug = 0;
3756     im->gdes[im->gdes_c - 1].start = im->start;
3757     im->gdes[im->gdes_c - 1].start_orig = im->start;
3758     im->gdes[im->gdes_c - 1].end = im->end;
3759     im->gdes[im->gdes_c - 1].end_orig = im->end;
3760     im->gdes[im->gdes_c - 1].vname[0] = '\0';
3761     im->gdes[im->gdes_c - 1].data = NULL;
3762     im->gdes[im->gdes_c - 1].ds_namv = NULL;
3763     im->gdes[im->gdes_c - 1].data_first = 0;
3764     im->gdes[im->gdes_c - 1].p_data = NULL;
3765     im->gdes[im->gdes_c - 1].rpnp = NULL;
3766     im->gdes[im->gdes_c - 1].p_dashes = NULL;
3767     im->gdes[im->gdes_c - 1].shift = 0.0;
3768     im->gdes[im->gdes_c - 1].dash = 0;
3769     im->gdes[im->gdes_c - 1].ndash = 0;
3770     im->gdes[im->gdes_c - 1].offset = 0;
3771     im->gdes[im->gdes_c - 1].col.red = 0.0;
3772     im->gdes[im->gdes_c - 1].col.green = 0.0;
3773     im->gdes[im->gdes_c - 1].col.blue = 0.0;
3774     im->gdes[im->gdes_c - 1].col.alpha = 0.0;
3775     im->gdes[im->gdes_c - 1].legend[0] = '\0';
3776     im->gdes[im->gdes_c - 1].format[0] = '\0';
3777     im->gdes[im->gdes_c - 1].strftm = 0;
3778     im->gdes[im->gdes_c - 1].rrd[0] = '\0';
3779     im->gdes[im->gdes_c - 1].ds = -1;
3780     im->gdes[im->gdes_c - 1].cf_reduce = CF_AVERAGE;
3781     im->gdes[im->gdes_c - 1].cf = CF_AVERAGE;
3782     im->gdes[im->gdes_c - 1].yrule = DNAN;
3783     im->gdes[im->gdes_c - 1].xrule = 0;
3784     return 0;
3785 }
3786
3787 /* copies input untill the first unescaped colon is found
3788    or until input ends. backslashes have to be escaped as well */
3789 int scan_for_col(
3790     const char *const input,
3791     int len,
3792     char *const output)
3793 {
3794     int       inp, outp = 0;
3795
3796     for (inp = 0; inp < len && input[inp] != ':' && input[inp] != '\0'; inp++) {
3797         if (input[inp] == '\\'
3798             && input[inp + 1] != '\0'
3799             && (input[inp + 1] == '\\' || input[inp + 1] == ':')) {
3800             output[outp++] = input[++inp];
3801         } else {
3802             output[outp++] = input[inp];
3803         }
3804     }
3805     output[outp] = '\0';
3806     return inp;
3807 }
3808
3809 /* Now just a wrapper around rrd_graph_v */
3810 int rrd_graph(
3811     int argc,
3812     char **argv,
3813     char ***prdata,
3814     int *xsize,
3815     int *ysize,
3816     FILE * stream,
3817     double *ymin,
3818     double *ymax)
3819 {
3820     int       prlines = 0;
3821     rrd_info_t *grinfo = NULL;
3822     rrd_info_t *walker;
3823
3824     grinfo = rrd_graph_v(argc, argv);
3825     if (grinfo == NULL)
3826         return -1;
3827     walker = grinfo;
3828     (*prdata) = NULL;
3829     while (walker) {
3830         if (strcmp(walker->key, "image_info") == 0) {
3831             prlines++;
3832             if (((*prdata) =
3833                  (char**)rrd_realloc((*prdata),
3834                              (prlines + 1) * sizeof(char *))) == NULL) {
3835                 rrd_set_error("realloc prdata");
3836                 return 0;
3837             }
3838             /* imginfo goes to position 0 in the prdata array */
3839             (*prdata)[prlines - 1] = (char*)malloc((strlen(walker->value.u_str)
3840                                              + 2) * sizeof(char));
3841             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3842             (*prdata)[prlines] = NULL;
3843         }
3844         /* skip anything else */
3845         walker = walker->next;
3846     }
3847     walker = grinfo;
3848     *xsize = 0;
3849     *ysize = 0;
3850     *ymin = 0;
3851     *ymax = 0;
3852     while (walker) {
3853         if (strcmp(walker->key, "image_width") == 0) {
3854             *xsize = walker->value.u_cnt;
3855         } else if (strcmp(walker->key, "image_height") == 0) {
3856             *ysize = walker->value.u_cnt;
3857         } else if (strcmp(walker->key, "value_min") == 0) {
3858             *ymin = walker->value.u_val;
3859         } else if (strcmp(walker->key, "value_max") == 0) {
3860             *ymax = walker->value.u_val;
3861         } else if (strncmp(walker->key, "print", 5) == 0) { /* keys are prdate[0..] */
3862             prlines++;
3863             if (((*prdata) =
3864                  (char**)rrd_realloc((*prdata),
3865                              (prlines + 1) * sizeof(char *))) == NULL) {
3866                 rrd_set_error("realloc prdata");
3867                 return 0;
3868             }
3869             (*prdata)[prlines - 1] = (char*)malloc((strlen(walker->value.u_str)
3870                                              + 2) * sizeof(char));
3871             (*prdata)[prlines] = NULL;
3872             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3873         } else if (strcmp(walker->key, "image") == 0) {
3874             if ( fwrite(walker->value.u_blo.ptr, walker->value.u_blo.size, 1,
3875                    (stream ? stream : stdout)) == 0 && ferror(stream ? stream : stdout)){
3876                 rrd_set_error("writing image");
3877                 return 0;
3878             }
3879         }
3880         /* skip anything else */
3881         walker = walker->next;
3882     }
3883     rrd_info_free(grinfo);
3884     return 0;
3885 }
3886
3887
3888 /* Some surgery done on this function, it became ridiculously big.
3889 ** Things moved:
3890 ** - initializing     now in rrd_graph_init()
3891 ** - options parsing  now in rrd_graph_options()
3892 ** - script parsing   now in rrd_graph_script()
3893 */
3894 rrd_info_t *rrd_graph_v(
3895     int argc,
3896     char **argv)
3897 {
3898     image_desc_t im;
3899     rrd_info_t *grinfo;
3900     rrd_graph_init(&im);
3901     /* a dummy surface so that we can measure text sizes for placements */
3902
3903     rrd_graph_options(argc, argv, &im);
3904     if (rrd_test_error()) {
3905         rrd_info_free(im.grinfo);
3906         im_free(&im);
3907         return NULL;
3908     }
3909
3910     if (optind >= argc) {
3911         rrd_info_free(im.grinfo);
3912         im_free(&im);
3913         rrd_set_error("missing filename");
3914         return NULL;
3915     }
3916
3917     if (strlen(argv[optind]) >= MAXPATH) {
3918         rrd_set_error("filename (including path) too long");
3919         rrd_info_free(im.grinfo);
3920         im_free(&im);
3921         return NULL;
3922     }
3923
3924     strncpy(im.graphfile, argv[optind], MAXPATH - 1);
3925     im.graphfile[MAXPATH - 1] = '\0';
3926
3927     if (strcmp(im.graphfile, "-") == 0) {
3928         im.graphfile[0] = '\0';
3929     }
3930
3931     rrd_graph_script(argc, argv, &im, 1);
3932     if (rrd_test_error()) {
3933         rrd_info_free(im.grinfo);
3934         im_free(&im);
3935         return NULL;
3936     }
3937
3938     /* Everything is now read and the actual work can start */
3939
3940     if (graph_paint(&im) == -1) {
3941         rrd_info_free(im.grinfo);
3942         im_free(&im);
3943         return NULL;
3944     }
3945
3946
3947     /* The image is generated and needs to be output.
3948      ** Also, if needed, print a line with information about the image.
3949      */
3950
3951     if (im.imginfo) {
3952         rrd_infoval_t info;
3953         char     *path;
3954         char     *filename;
3955
3956         path = strdup(im.graphfile);
3957         filename = basename(path);
3958         info.u_str =
3959             sprintf_alloc(im.imginfo,
3960                           filename,
3961                           (long) (im.zoom *
3962                                   im.ximg), (long) (im.zoom * im.yimg));
3963         grinfo_push(&im, sprintf_alloc("image_info"), RD_I_STR, info);
3964         free(info.u_str);
3965         free(path);
3966     }
3967     if (im.rendered_image) {
3968         rrd_infoval_t img;
3969
3970         img.u_blo.size = im.rendered_image_size;
3971         img.u_blo.ptr = im.rendered_image;
3972         grinfo_push(&im, sprintf_alloc("image"), RD_I_BLO, img);
3973     }
3974     grinfo = im.grinfo;
3975     im_free(&im);
3976     return grinfo;
3977 }
3978
3979 static void
3980 rrd_set_font_desc (
3981     image_desc_t *im,int prop,char *font, double size ){
3982     if (font){
3983         strncpy(im->text_prop[prop].font, font, sizeof(text_prop[prop].font) - 1);
3984         im->text_prop[prop].font[sizeof(text_prop[prop].font) - 1] = '\0';
3985         im->text_prop[prop].font_desc = pango_font_description_from_string( font );
3986     };
3987     if (size > 0){
3988         im->text_prop[prop].size = size;
3989     };
3990     if (im->text_prop[prop].font_desc && im->text_prop[prop].size ){
3991         pango_font_description_set_size(im->text_prop[prop].font_desc, im->text_prop[prop].size * PANGO_SCALE);
3992     };
3993 }
3994
3995 void rrd_graph_init(
3996     image_desc_t
3997     *im)
3998 {
3999     unsigned int i;
4000     char     *deffont = getenv("RRD_DEFAULT_FONT");
4001     static PangoFontMap *fontmap = NULL;
4002     PangoContext *context;
4003
4004 #ifdef HAVE_TZSET
4005     tzset();
4006 #endif
4007
4008     im->base = 1000;
4009     im->daemon_addr = NULL;
4010     im->draw_x_grid = 1;
4011     im->draw_y_grid = 1;
4012     im->draw_3d_border = 2;
4013     im->extra_flags = 0;
4014     im->font_options = cairo_font_options_create();
4015     im->forceleftspace = 0;
4016     im->gdes_c = 0;
4017     im->gdes = NULL;
4018     im->graph_antialias = CAIRO_ANTIALIAS_GRAY;
4019     im->grid_dash_off = 1;
4020     im->grid_dash_on = 1;
4021     im->gridfit = 1;
4022     im->grinfo = (rrd_info_t *) NULL;
4023     im->grinfo_current = (rrd_info_t *) NULL;
4024     im->imgformat = IF_PNG;
4025     im->imginfo = NULL;
4026     im->lazy = 0;
4027     im->legenddirection = TOP_DOWN;
4028     im->legendheight = 0;
4029     im->legendposition = SOUTH;
4030     im->legendwidth = 0;
4031     im->logarithmic = 0;
4032     im->maxval = DNAN;
4033     im->minval = 0;
4034     im->minval = DNAN;
4035     im->prt_c = 0;
4036     im->rigid = 0;
4037     im->rendered_image_size = 0;
4038     im->rendered_image = NULL;
4039     im->slopemode = 0;
4040     im->step = 0;
4041     im->symbol = ' ';
4042     im->tabwidth = 40.0;
4043     im->title[0] = '\0';
4044     im->unitsexponent = 9999;
4045     im->unitslength = 6;
4046     im->viewfactor = 1.0;
4047     im->watermark[0] = '\0';
4048     im->with_markup = 0;
4049     im->ximg = 0;
4050     im->xlab_user.minsec = -1;
4051     im->xorigin = 0;
4052     im->xOriginLegend = 0;
4053     im->xOriginLegendY = 0;
4054     im->xOriginLegendY2 = 0;
4055     im->xOriginTitle = 0;
4056     im->xsize = 400;
4057     im->ygridstep = DNAN;
4058     im->yimg = 0;
4059     im->ylegend[0] = '\0';
4060     im->second_axis_scale = 0; /* 0 disables it */
4061     im->second_axis_shift = 0; /* no shift by default */
4062     im->second_axis_legend[0] = '\0';
4063     im->second_axis_format[0] = '\0';
4064     im->yorigin = 0;
4065     im->yOriginLegend = 0;
4066     im->yOriginLegendY = 0;
4067     im->yOriginLegendY2 = 0;
4068     im->yOriginTitle = 0;
4069     im->ysize = 100;
4070     im->zoom = 1;
4071
4072     im->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 10, 10);
4073     im->cr = cairo_create(im->surface);
4074
4075     for (i = 0; i < DIM(text_prop); i++) {
4076         im->text_prop[i].size = -1;
4077         rrd_set_font_desc(im,i, deffont ? deffont : text_prop[i].font,text_prop[i].size);
4078     }
4079
4080     if (fontmap == NULL){
4081         fontmap = pango_cairo_font_map_get_default();
4082     }
4083
4084     context =  pango_cairo_font_map_create_context((PangoCairoFontMap*)fontmap);
4085
4086     pango_cairo_context_set_resolution(context, 100);
4087
4088     pango_cairo_update_context(im->cr,context);
4089
4090     im->layout = pango_layout_new(context);
4091
4092 //  im->layout = pango_cairo_create_layout(im->cr);
4093
4094
4095     cairo_font_options_set_hint_style
4096         (im->font_options, CAIRO_HINT_STYLE_FULL);
4097     cairo_font_options_set_hint_metrics
4098         (im->font_options, CAIRO_HINT_METRICS_ON);
4099     cairo_font_options_set_antialias(im->font_options, CAIRO_ANTIALIAS_GRAY);
4100
4101
4102
4103     for (i = 0; i < DIM(graph_col); i++)
4104         im->graph_col[i] = graph_col[i];
4105
4106
4107 }
4108
4109
4110 void rrd_graph_options(
4111     int argc,
4112     char *argv[],
4113     image_desc_t
4114     *im)
4115 {
4116     int       stroff;
4117     char     *parsetime_error = NULL;
4118     char      scan_gtm[12], scan_mtm[12], scan_ltm[12], col_nam[12];
4119     time_t    start_tmp = 0, end_tmp = 0;
4120     long      long_tmp;
4121     rrd_time_value_t start_tv, end_tv;
4122     long unsigned int color;
4123     char     *old_locale = "";
4124
4125     /* defines for long options without a short equivalent. should be bytes,
4126        and may not collide with (the ASCII value of) short options */
4127 #define LONGOPT_UNITS_SI 255
4128
4129 /* *INDENT-OFF* */
4130     struct option long_options[] = {
4131         { "alt-autoscale",      no_argument,       0, 'A'},
4132         { "imgformat",          required_argument, 0, 'a'},
4133         { "font-smoothing-threshold", required_argument, 0, 'B'},
4134         { "base",               required_argument, 0, 'b'},
4135         { "color",              required_argument, 0, 'c'},
4136         { "full-size-mode",     no_argument,       0, 'D'},
4137         { "daemon",             required_argument, 0, 'd'},
4138         { "slope-mode",         no_argument,       0, 'E'},
4139         { "end",                required_argument, 0, 'e'},
4140         { "force-rules-legend", no_argument,       0, 'F'},
4141         { "imginfo",            required_argument, 0, 'f'},
4142         { "graph-render-mode",  required_argument, 0, 'G'},
4143         { "no-legend",          no_argument,       0, 'g'},
4144         { "height",             required_argument, 0, 'h'},
4145         { "no-minor",           no_argument,       0, 'I'},
4146         { "interlaced",         no_argument,       0, 'i'},
4147         { "alt-autoscale-min",  no_argument,       0, 'J'},
4148         { "only-graph",         no_argument,       0, 'j'},
4149         { "units-length",       required_argument, 0, 'L'},
4150         { "lower-limit",        required_argument, 0, 'l'},
4151         { "alt-autoscale-max",  no_argument,       0, 'M'},
4152         { "zoom",               required_argument, 0, 'm'},
4153         { "no-gridfit",         no_argument,       0, 'N'},
4154         { "font",               required_argument, 0, 'n'},
4155         { "logarithmic",        no_argument,       0, 'o'},
4156         { "pango-markup",       no_argument,       0, 'P'},
4157         { "font-render-mode",   required_argument, 0, 'R'},
4158         { "rigid",              no_argument,       0, 'r'},
4159         { "step",               required_argument, 0, 'S'},
4160         { "start",              required_argument, 0, 's'},
4161         { "tabwidth",           required_argument, 0, 'T'},
4162         { "title",              required_argument, 0, 't'},
4163         { "upper-limit",        required_argument, 0, 'u'},
4164         { "vertical-label",     required_argument, 0, 'v'},
4165         { "watermark",          required_argument, 0, 'W'},
4166         { "width",              required_argument, 0, 'w'},
4167         { "units-exponent",     required_argument, 0, 'X'},
4168         { "x-grid",             required_argument, 0, 'x'},
4169         { "alt-y-grid",         no_argument,       0, 'Y'},
4170         { "y-grid",             required_argument, 0, 'y'},
4171         { "lazy",               no_argument,       0, 'z'},
4172         { "units",              required_argument, 0, LONGOPT_UNITS_SI},
4173         { "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 */
4174         { "disable-rrdtool-tag",no_argument,       0, 1001},
4175         { "right-axis",         required_argument, 0, 1002},
4176         { "right-axis-label",   required_argument, 0, 1003},
4177         { "right-axis-format",  required_argument, 0, 1004},
4178         { "legend-position",    required_argument, 0, 1005},
4179         { "legend-direction",   required_argument, 0, 1006},
4180         { "border",             required_argument, 0, 1007},
4181         {  0, 0, 0, 0}
4182 };
4183 /* *INDENT-ON* */
4184
4185     optind = 0;
4186     opterr = 0;         /* initialize getopt */
4187     rrd_parsetime("end-24h", &start_tv);
4188     rrd_parsetime("now", &end_tv);
4189     while (1) {
4190         int       option_index = 0;
4191         int       opt;
4192         int       col_start, col_end;
4193
4194         opt = getopt_long(argc, argv,
4195                           "Aa:B:b:c:Dd:Ee:Ff:G:gh:IiJjL:l:Nn:Bb:oPR:rS:s:T:t:u:v:W:w:X:x:Yy:z",
4196                           long_options, &option_index);
4197         if (opt == EOF)
4198             break;
4199         switch (opt) {
4200         case 'I':
4201             im->extra_flags |= NOMINOR;
4202             break;
4203         case 'Y':
4204             im->extra_flags |= ALTYGRID;
4205             break;
4206         case 'A':
4207             im->extra_flags |= ALTAUTOSCALE;
4208             break;
4209         case 'J':
4210             im->extra_flags |= ALTAUTOSCALE_MIN;
4211             break;
4212         case 'M':
4213             im->extra_flags |= ALTAUTOSCALE_MAX;
4214             break;
4215         case 'j':
4216             im->extra_flags |= ONLY_GRAPH;
4217             break;
4218         case 'g':
4219             im->extra_flags |= NOLEGEND;
4220             break;
4221         case 1005:
4222             if (strcmp(optarg, "north") == 0) {
4223                 im->legendposition = NORTH;
4224             } else if (strcmp(optarg, "west") == 0) {
4225                 im->legendposition = WEST;
4226             } else if (strcmp(optarg, "south") == 0) {
4227                 im->legendposition = SOUTH;
4228             } else if (strcmp(optarg, "east") == 0) {
4229                 im->legendposition = EAST;
4230             } else {
4231                 rrd_set_error("unknown legend-position '%s'", optarg);
4232                 return;
4233             }
4234             break;
4235         case 1006:
4236             if (strcmp(optarg, "topdown") == 0) {
4237                 im->legenddirection = TOP_DOWN;
4238             } else if (strcmp(optarg, "bottomup") == 0) {
4239                 im->legenddirection = BOTTOM_UP;
4240             } else {
4241                 rrd_set_error("unknown legend-position '%s'", optarg);
4242                 return;
4243             }
4244             break;
4245         case 'F':
4246             im->extra_flags |= FORCE_RULES_LEGEND;
4247             break;
4248         case 1001:
4249             im->extra_flags |= NO_RRDTOOL_TAG;
4250             break;
4251         case LONGOPT_UNITS_SI:
4252             if (im->extra_flags & FORCE_UNITS) {
4253                 rrd_set_error("--units can only be used once!");
4254                 setlocale(LC_NUMERIC, old_locale);
4255                 return;
4256             }
4257             if (strcmp(optarg, "si") == 0)
4258                 im->extra_flags |= FORCE_UNITS_SI;
4259             else {
4260                 rrd_set_error("invalid argument for --units: %s", optarg);
4261                 return;
4262             }
4263             break;
4264         case 'X':
4265             im->unitsexponent = atoi(optarg);
4266             break;
4267         case 'L':
4268             im->unitslength = atoi(optarg);
4269             im->forceleftspace = 1;
4270             break;
4271         case 'T':
4272             old_locale = setlocale(LC_NUMERIC, "C");
4273             im->tabwidth = atof(optarg);
4274             setlocale(LC_NUMERIC, old_locale);
4275             break;
4276         case 'S':
4277             old_locale = setlocale(LC_NUMERIC, "C");
4278             im->step = atoi(optarg);
4279             setlocale(LC_NUMERIC, old_locale);
4280             break;
4281         case 'N':
4282             im->gridfit = 0;
4283             break;
4284         case 'P':
4285             im->with_markup = 1;
4286             break;
4287         case 's':
4288             if ((parsetime_error = rrd_parsetime(optarg, &start_tv))) {
4289                 rrd_set_error("start time: %s", parsetime_error);
4290                 return;
4291             }
4292             break;
4293         case 'e':
4294             if ((parsetime_error = rrd_parsetime(optarg, &end_tv))) {
4295                 rrd_set_error("end time: %s", parsetime_error);
4296                 return;
4297             }
4298             break;
4299         case 'x':
4300             if (strcmp(optarg, "none") == 0) {
4301                 im->draw_x_grid = 0;
4302                 break;
4303             };
4304             if (sscanf(optarg,
4305                        "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
4306                        scan_gtm,
4307                        &im->xlab_user.gridst,
4308                        scan_mtm,
4309                        &im->xlab_user.mgridst,
4310                        scan_ltm,
4311                        &im->xlab_user.labst,
4312                        &im->xlab_user.precis, &stroff) == 7 && stroff != 0) {
4313                 strncpy(im->xlab_form, optarg + stroff,
4314                         sizeof(im->xlab_form) - 1);
4315                 im->xlab_form[sizeof(im->xlab_form) - 1] = '\0';
4316                 if ((int)
4317                     (im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1) {
4318                     rrd_set_error("unknown keyword %s", scan_gtm);
4319                     return;
4320                 } else if ((int)
4321                            (im->xlab_user.mgridtm = tmt_conv(scan_mtm))
4322                            == -1) {
4323                     rrd_set_error("unknown keyword %s", scan_mtm);
4324                     return;
4325                 } else if ((int)
4326                            (im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1) {
4327                     rrd_set_error("unknown keyword %s", scan_ltm);
4328                     return;
4329                 }
4330                 im->xlab_user.minsec = 1;
4331                 im->xlab_user.stst = im->xlab_form;
4332             } else {
4333                 rrd_set_error("invalid x-grid format");
4334                 return;
4335             }
4336             break;
4337         case 'y':
4338
4339             if (strcmp(optarg, "none") == 0) {
4340                 im->draw_y_grid = 0;
4341                 break;
4342             };
4343             old_locale = setlocale(LC_NUMERIC, "C");
4344             if (sscanf(optarg, "%lf:%d", &im->ygridstep, &im->ylabfact) == 2) {
4345                 setlocale(LC_NUMERIC, old_locale);
4346                 if (im->ygridstep <= 0) {
4347                     rrd_set_error("grid step must be > 0");
4348                     return;
4349                 } else if (im->ylabfact < 1) {
4350                     rrd_set_error("label factor must be > 0");
4351                     return;
4352                 }
4353             } else {
4354                 setlocale(LC_NUMERIC, old_locale);
4355                 rrd_set_error("invalid y-grid format");
4356                 return;
4357             }
4358             break;
4359         case 1007:
4360             im->draw_3d_border = atoi(optarg);
4361             break;
4362         case 1002: /* right y axis */
4363
4364             if(sscanf(optarg,
4365                       "%lf:%lf",
4366                       &im->second_axis_scale,
4367                       &im->second_axis_shift) == 2) {
4368                 if(im->second_axis_scale==0){
4369                     rrd_set_error("the second_axis_scale  must not be 0");
4370                     return;
4371                 }
4372             } else {
4373                 rrd_set_error("invalid right-axis format expected scale:shift");
4374                 return;
4375             }
4376             break;
4377         case 1003:
4378             strncpy(im->second_axis_legend,optarg,150);
4379             im->second_axis_legend[150]='\0';
4380             break;
4381         case 1004:
4382             if (bad_format(optarg)){
4383                 rrd_set_error("use either %le or %lf formats");
4384                 return;
4385             }
4386             strncpy(im->second_axis_format,optarg,150);
4387             im->second_axis_format[150]='\0';
4388             break;
4389         case 'v':
4390             strncpy(im->ylegend, optarg, 150);
4391             im->ylegend[150] = '\0';
4392             break;
4393         case 'u':
4394             old_locale = setlocale(LC_NUMERIC, "C");
4395             im->maxval = atof(optarg);
4396             setlocale(LC_NUMERIC, old_locale);
4397             break;
4398         case 'l':
4399             old_locale = setlocale(LC_NUMERIC, "C");
4400             im->minval = atof(optarg);
4401             setlocale(LC_NUMERIC, old_locale);
4402             break;
4403         case 'b':
4404             im->base = atol(optarg);
4405             if (im->base != 1024 && im->base != 1000) {
4406                 rrd_set_error
4407                     ("the only sensible value for base apart from 1000 is 1024");
4408                 return;
4409             }
4410             break;
4411         case 'w':
4412             long_tmp = atol(optarg);
4413             if (long_tmp < 10) {
4414                 rrd_set_error("width below 10 pixels");
4415                 return;
4416             }
4417             im->xsize = long_tmp;
4418             break;
4419         case 'h':
4420             long_tmp = atol(optarg);
4421             if (long_tmp < 10) {
4422                 rrd_set_error("height below 10 pixels");
4423                 return;
4424             }
4425             im->ysize = long_tmp;
4426             break;
4427         case 'D':
4428             im->extra_flags |= FULL_SIZE_MODE;
4429             break;
4430         case 'i':
4431             /* interlaced png not supported at the moment */
4432             break;
4433         case 'r':
4434             im->rigid = 1;
4435             break;
4436         case 'f':
4437             im->imginfo = optarg;
4438             break;
4439         case 'a':
4440             if ((int)
4441                 (im->imgformat = if_conv(optarg)) == -1) {
4442                 rrd_set_error("unsupported graphics format '%s'", optarg);
4443                 return;
4444             }
4445             break;
4446         case 'z':
4447             im->lazy = 1;
4448             break;
4449         case 'E':
4450             im->slopemode = 1;
4451             break;
4452         case 'o':
4453             im->logarithmic = 1;
4454             break;
4455         case 'c':
4456             if (sscanf(optarg,
4457                        "%10[A-Z]#%n%8lx%n",
4458                        col_nam, &col_start, &color, &col_end) == 2) {
4459                 int       ci;
4460                 int       col_len = col_end - col_start;
4461
4462                 switch (col_len) {
4463                 case 3:
4464                     color =
4465                         (((color & 0xF00) * 0x110000) | ((color & 0x0F0) *
4466                                                          0x011000) |
4467                          ((color & 0x00F)
4468                           * 0x001100)
4469                          | 0x000000FF);
4470                     break;
4471                 case 4:
4472                     color =
4473                         (((color & 0xF000) *
4474                           0x11000) | ((color & 0x0F00) *
4475                                       0x01100) | ((color &
4476                                                    0x00F0) *
4477                                                   0x00110) |
4478                          ((color & 0x000F) * 0x00011)
4479                         );
4480                     break;
4481                 case 6:
4482                     color = (color << 8) + 0xff /* shift left by 8 */ ;
4483                     break;
4484                 case 8:
4485                     break;
4486                 default:
4487                     rrd_set_error("the color format is #RRGGBB[AA]");
4488                     return;
4489                 }
4490                 if ((ci = grc_conv(col_nam)) != -1) {
4491                     im->graph_col[ci] = gfx_hex_to_col(color);
4492                 } else {
4493                     rrd_set_error("invalid color name '%s'", col_nam);
4494                     return;
4495                 }
4496             } else {
4497                 rrd_set_error("invalid color def format");
4498                 return;
4499             }
4500             break;
4501         case 'n':{
4502             char      prop[15];
4503             double    size = 1;
4504             int       end;
4505
4506             old_locale = setlocale(LC_NUMERIC, "C");
4507             if (sscanf(optarg, "%10[A-Z]:%lf%n", prop, &size, &end) >= 2) {
4508                 int       sindex, propidx;
4509
4510                 setlocale(LC_NUMERIC, old_locale);
4511                 if ((sindex = text_prop_conv(prop)) != -1) {
4512                     for (propidx = sindex;
4513                          propidx < TEXT_PROP_LAST; propidx++) {
4514                         if (size > 0) {
4515                             rrd_set_font_desc(im,propidx,NULL,size);
4516                         }
4517                         if ((int) strlen(optarg) > end+2) {
4518                             if (optarg[end] == ':') {
4519                                 rrd_set_font_desc(im,propidx,optarg + end + 1,0);
4520                             } else {
4521                                 rrd_set_error
4522                                     ("expected : after font size in '%s'",
4523                                      optarg);
4524                                 return;
4525                             }
4526                         }
4527                         /* only run the for loop for DEFAULT (0) for
4528                            all others, we break here. woodo programming */
4529                         if (propidx == sindex && sindex != 0)
4530                             break;
4531                     }
4532                 } else {
4533                     rrd_set_error("invalid fonttag '%s'", prop);
4534                     return;
4535                 }
4536             } else {
4537                 setlocale(LC_NUMERIC, old_locale);
4538                 rrd_set_error("invalid text property format");
4539                 return;
4540             }
4541             break;
4542         }
4543         case 'm':
4544             old_locale = setlocale(LC_NUMERIC, "C");
4545             im->zoom = atof(optarg);
4546             setlocale(LC_NUMERIC, old_locale);
4547             if (im->zoom <= 0.0) {
4548                 rrd_set_error("zoom factor must be > 0");
4549                 return;
4550             }
4551             break;
4552         case 't':
4553             strncpy(im->title, optarg, 150);
4554             im->title[150] = '\0';
4555             break;
4556         case 'R':
4557             if (strcmp(optarg, "normal") == 0) {
4558                 cairo_font_options_set_antialias
4559                     (im->font_options, CAIRO_ANTIALIAS_GRAY);
4560                 cairo_font_options_set_hint_style
4561                     (im->font_options, CAIRO_HINT_STYLE_FULL);
4562             } else if (strcmp(optarg, "light") == 0) {
4563                 cairo_font_options_set_antialias
4564                     (im->font_options, CAIRO_ANTIALIAS_GRAY);
4565                 cairo_font_options_set_hint_style
4566                     (im->font_options, CAIRO_HINT_STYLE_SLIGHT);
4567             } else if (strcmp(optarg, "mono") == 0) {
4568                 cairo_font_options_set_antialias
4569                     (im->font_options, CAIRO_ANTIALIAS_NONE);
4570                 cairo_font_options_set_hint_style
4571                     (im->font_options, CAIRO_HINT_STYLE_FULL);
4572             } else {
4573                 rrd_set_error("unknown font-render-mode '%s'", optarg);
4574                 return;
4575             }
4576             break;
4577         case 'G':
4578             if (strcmp(optarg, "normal") == 0)
4579                 im->graph_antialias = CAIRO_ANTIALIAS_GRAY;
4580             else if (strcmp(optarg, "mono") == 0)
4581                 im->graph_antialias = CAIRO_ANTIALIAS_NONE;
4582             else {
4583                 rrd_set_error("unknown graph-render-mode '%s'", optarg);
4584                 return;
4585             }
4586             break;
4587         case 'B':
4588             /* not supported curently */
4589             break;
4590         case 'W':
4591             strncpy(im->watermark, optarg, 100);
4592             im->watermark[99] = '\0';
4593             break;
4594         case 'd':
4595         {
4596             if (im->daemon_addr != NULL)
4597             {
4598                 rrd_set_error ("You cannot specify --daemon "
4599                         "more than once.");
4600                 return;
4601             }
4602
4603             im->daemon_addr = strdup(optarg);
4604             if (im->daemon_addr == NULL)
4605             {
4606               rrd_set_error("strdup failed");
4607               return;
4608             }
4609
4610             break;
4611         }
4612         case '?':
4613             if (optopt != 0)
4614                 rrd_set_error("unknown option '%c'", optopt);
4615             else
4616                 rrd_set_error("unknown option '%s'", argv[optind - 1]);
4617             return;
4618         }
4619     } /* while (1) */
4620
4621     {   /* try to connect to rrdcached */
4622         int status = rrdc_connect(im->daemon_addr);
4623         if (status != 0) return;
4624     }
4625
4626     pango_cairo_context_set_font_options(pango_layout_get_context(im->layout), im->font_options);
4627     pango_layout_context_changed(im->layout);
4628
4629
4630
4631     if (im->logarithmic && im->minval <= 0) {
4632         rrd_set_error
4633             ("for a logarithmic yaxis you must specify a lower-limit > 0");
4634         return;
4635     }
4636
4637     if (rrd_proc_start_end(&start_tv, &end_tv, &start_tmp, &end_tmp) == -1) {
4638         /* error string is set in rrd_parsetime.c */
4639         return;
4640     }
4641
4642     if (start_tmp < 3600 * 24 * 365 * 10) {
4643         rrd_set_error
4644             ("the first entry to fetch should be after 1980 (%ld)",
4645              start_tmp);
4646         return;
4647     }
4648
4649     if (end_tmp < start_tmp) {
4650         rrd_set_error
4651             ("start (%ld) should be less than end (%ld)", start_tmp, end_tmp);
4652         return;
4653     }
4654
4655     im->start = start_tmp;
4656     im->end = end_tmp;
4657     im->step = max((long) im->step, (im->end - im->start) / im->xsize);
4658 }
4659
4660 int rrd_graph_color(
4661     image_desc_t
4662     *im,
4663     char *var,
4664     char *err,
4665     int optional)
4666 {
4667     char     *color;
4668     graph_desc_t *gdp = &im->gdes[im->gdes_c - 1];
4669
4670     color = strstr(var, "#");
4671     if (color == NULL) {
4672         if (optional == 0) {
4673             rrd_set_error("Found no color in %s", err);
4674             return 0;
4675         }
4676         return 0;
4677     } else {
4678         int       n = 0;
4679         char     *rest;
4680         long unsigned int col;
4681
4682         rest = strstr(color, ":");
4683         if (rest != NULL)
4684             n = rest - color;
4685         else
4686             n = strlen(color);
4687         switch (n) {
4688         case 7:
4689             sscanf(color, "#%6lx%n", &col, &n);
4690             col = (col << 8) + 0xff /* shift left by 8 */ ;
4691             if (n != 7)
4692                 rrd_set_error("Color problem in %s", err);
4693             break;
4694         case 9:
4695             sscanf(color, "#%8lx%n", &col, &n);
4696             if (n == 9)
4697                 break;
4698         default:
4699             rrd_set_error("Color problem in %s", err);
4700         }
4701         if (rrd_test_error())
4702             return 0;
4703         gdp->col = gfx_hex_to_col(col);
4704         return n;
4705     }
4706 }
4707
4708
4709 int bad_format(
4710     char *fmt)
4711 {
4712     char     *ptr;
4713     int       n = 0;
4714
4715     ptr = fmt;
4716     while (*ptr != '\0')
4717         if (*ptr++ == '%') {
4718
4719             /* line cannot end with percent char */
4720             if (*ptr == '\0')
4721                 return 1;
4722             /* '%s', '%S' and '%%' are allowed */
4723             if (*ptr == 's' || *ptr == 'S' || *ptr == '%')
4724                 ptr++;
4725             /* %c is allowed (but use only with vdef!) */
4726             else if (*ptr == 'c') {
4727                 ptr++;
4728                 n = 1;
4729             }
4730
4731             /* or else '% 6.2lf' and such are allowed */
4732             else {
4733                 /* optional padding character */
4734                 if (*ptr == ' ' || *ptr == '+' || *ptr == '-')
4735                     ptr++;
4736                 /* This should take care of 'm.n' with all three optional */
4737                 while (*ptr >= '0' && *ptr <= '9')
4738                     ptr++;
4739                 if (*ptr == '.')
4740                     ptr++;
4741                 while (*ptr >= '0' && *ptr <= '9')
4742                     ptr++;
4743                 /* Either 'le', 'lf' or 'lg' must follow here */
4744                 if (*ptr++ != 'l')
4745                     return 1;
4746                 if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g')
4747                     ptr++;
4748                 else
4749                     return 1;
4750                 n++;
4751             }
4752         }
4753
4754     return (n != 1);
4755 }
4756
4757
4758 int vdef_parse(
4759     struct graph_desc_t
4760     *gdes,
4761     const char *const str)
4762 {
4763     /* A VDEF currently is either "func" or "param,func"
4764      * so the parsing is rather simple.  Change if needed.
4765      */
4766     double    param;
4767     char      func[30];
4768     int       n;
4769     char     *old_locale;
4770
4771     n = 0;
4772     old_locale = setlocale(LC_NUMERIC, "C");
4773     sscanf(str, "%le,%29[A-Z]%n", &param, func, &n);
4774     setlocale(LC_NUMERIC, old_locale);
4775     if (n == (int) strlen(str)) {   /* matched */
4776         ;
4777     } else {
4778         n = 0;
4779         sscanf(str, "%29[A-Z]%n", func, &n);
4780         if (n == (int) strlen(str)) {   /* matched */
4781             param = DNAN;
4782         } else {
4783             rrd_set_error
4784                 ("Unknown function string '%s' in VDEF '%s'",
4785                  str, gdes->vname);
4786             return -1;
4787         }
4788     }
4789     if (!strcmp("PERCENT", func))
4790         gdes->vf.op = VDEF_PERCENT;
4791     else if (!strcmp("PERCENTNAN", func))
4792         gdes->vf.op = VDEF_PERCENTNAN;
4793     else if (!strcmp("MAXIMUM", func))
4794         gdes->vf.op = VDEF_MAXIMUM;
4795     else if (!strcmp("AVERAGE", func))
4796         gdes->vf.op = VDEF_AVERAGE;
4797     else if (!strcmp("STDEV", func))
4798         gdes->vf.op = VDEF_STDEV;
4799     else if (!strcmp("MINIMUM", func))
4800         gdes->vf.op = VDEF_MINIMUM;
4801     else if (!strcmp("TOTAL", func))
4802         gdes->vf.op = VDEF_TOTAL;
4803     else if (!strcmp("FIRST", func))
4804         gdes->vf.op = VDEF_FIRST;
4805     else if (!strcmp("LAST", func))
4806         gdes->vf.op = VDEF_LAST;
4807     else if (!strcmp("LSLSLOPE", func))
4808         gdes->vf.op = VDEF_LSLSLOPE;
4809     else if (!strcmp("LSLINT", func))
4810         gdes->vf.op = VDEF_LSLINT;
4811     else if (!strcmp("LSLCORREL", func))
4812         gdes->vf.op = VDEF_LSLCORREL;
4813     else {
4814         rrd_set_error
4815             ("Unknown function '%s' in VDEF '%s'\n", func, gdes->vname);
4816         return -1;
4817     };
4818     switch (gdes->vf.op) {
4819     case VDEF_PERCENT:
4820     case VDEF_PERCENTNAN:
4821         if (isnan(param)) { /* no parameter given */
4822             rrd_set_error
4823                 ("Function '%s' needs parameter in VDEF '%s'\n",
4824                  func, gdes->vname);
4825             return -1;
4826         };
4827         if (param >= 0.0 && param <= 100.0) {
4828             gdes->vf.param = param;
4829             gdes->vf.val = DNAN;    /* undefined */
4830             gdes->vf.when = 0;  /* undefined */
4831         } else {
4832             rrd_set_error
4833                 ("Parameter '%f' out of range in VDEF '%s'\n",
4834                  param, gdes->vname);
4835             return -1;
4836         };
4837         break;
4838     case VDEF_MAXIMUM:
4839     case VDEF_AVERAGE:
4840     case VDEF_STDEV:
4841     case VDEF_MINIMUM:
4842     case VDEF_TOTAL:
4843     case VDEF_FIRST:
4844     case VDEF_LAST:
4845     case VDEF_LSLSLOPE:
4846     case VDEF_LSLINT:
4847     case VDEF_LSLCORREL:
4848         if (isnan(param)) {
4849             gdes->vf.param = DNAN;
4850             gdes->vf.val = DNAN;
4851             gdes->vf.when = 0;
4852         } else {
4853             rrd_set_error
4854                 ("Function '%s' needs no parameter in VDEF '%s'\n",
4855                  func, gdes->vname);
4856             return -1;
4857         };
4858         break;
4859     };
4860     return 0;
4861 }
4862
4863
4864 int vdef_calc(
4865     image_desc_t *im,
4866     int gdi)
4867 {
4868     graph_desc_t *src, *dst;
4869     rrd_value_t *data;
4870     long      step, steps;
4871
4872     dst = &im->gdes[gdi];
4873     src = &im->gdes[dst->vidx];
4874     data = src->data + src->ds;
4875
4876     steps = (src->end - src->start) / src->step;
4877 #if 0
4878     printf
4879         ("DEBUG: start == %lu, end == %lu, %lu steps\n",
4880          src->start, src->end, steps);
4881 #endif
4882     switch (dst->vf.op) {
4883     case VDEF_PERCENT:{
4884         rrd_value_t *array;
4885         int       field;
4886         if ((array = (rrd_value_t*)malloc(steps * sizeof(double))) == NULL) {
4887             rrd_set_error("malloc VDEV_PERCENT");
4888             return -1;
4889         }
4890         for (step = 0; step < steps; step++) {
4891             array[step] = data[step * src->ds_cnt];
4892         }
4893         qsort(array, step, sizeof(double), vdef_percent_compar);
4894         field = round((dst->vf.param * (double)(steps - 1)) / 100.0);
4895         dst->vf.val = array[field];
4896         dst->vf.when = 0;   /* no time component */
4897         free(array);
4898 #if 0
4899         for (step = 0; step < steps; step++)
4900             printf("DEBUG: %3li:%10.2f %c\n",
4901                    step, array[step], step == field ? '*' : ' ');
4902 #endif
4903     }
4904         break;
4905     case VDEF_PERCENTNAN:{
4906         rrd_value_t *array;
4907         int       field;
4908        /* count number of "valid" values */
4909        int nancount=0;
4910        for (step = 0; step < steps; step++) {
4911          if (!isnan(data[step * src->ds_cnt])) { nancount++; }
4912        }
4913        /* and allocate it */
4914         if ((array = (rrd_value_t*)malloc(nancount * sizeof(double))) == NULL) {
4915             rrd_set_error("malloc VDEV_PERCENT");
4916             return -1;
4917         }
4918        /* and fill it in */
4919        field=0;
4920         for (step = 0; step < steps; step++) {
4921            if (!isnan(data[step * src->ds_cnt])) {
4922                 array[field] = data[step * src->ds_cnt];
4923                field++;
4924             }
4925         }
4926         qsort(array, nancount, sizeof(double), vdef_percent_compar);
4927         field = round( dst->vf.param * (double)(nancount - 1) / 100.0);
4928         dst->vf.val = array[field];
4929         dst->vf.when = 0;   /* no time component */
4930         free(array);
4931     }
4932         break;
4933     case VDEF_MAXIMUM:
4934         step = 0;
4935         while (step != steps && isnan(data[step * src->ds_cnt]))
4936             step++;
4937         if (step == steps) {
4938             dst->vf.val = DNAN;
4939             dst->vf.when = 0;
4940         } else {
4941             dst->vf.val = data[step * src->ds_cnt];
4942             dst->vf.when = src->start + (step + 1) * src->step;
4943         }
4944         while (step != steps) {
4945             if (finite(data[step * src->ds_cnt])) {
4946                 if (data[step * src->ds_cnt] > dst->vf.val) {
4947                     dst->vf.val = data[step * src->ds_cnt];
4948                     dst->vf.when = src->start + (step + 1) * src->step;
4949                 }
4950             }
4951             step++;
4952         }
4953         break;
4954     case VDEF_TOTAL:
4955     case VDEF_STDEV:
4956     case VDEF_AVERAGE:{
4957         int       cnt = 0;
4958         double    sum = 0.0;
4959         double    average = 0.0;
4960
4961         for (step = 0; step < steps; step++) {
4962             if (finite(data[step * src->ds_cnt])) {
4963                 sum += data[step * src->ds_cnt];
4964                 cnt++;
4965             };
4966         }
4967         if (cnt) {
4968             if (dst->vf.op == VDEF_TOTAL) {
4969                 dst->vf.val = sum * src->step;
4970                 dst->vf.when = 0;   /* no time component */
4971             } else if (dst->vf.op == VDEF_AVERAGE) {
4972                 dst->vf.val = sum / cnt;
4973                 dst->vf.when = 0;   /* no time component */
4974             } else {
4975                 average = sum / cnt;
4976                 sum = 0.0;
4977                 for (step = 0; step < steps; step++) {
4978                     if (finite(data[step * src->ds_cnt])) {
4979                         sum += pow((data[step * src->ds_cnt] - average), 2.0);
4980                     };
4981                 }
4982                 dst->vf.val = pow(sum / cnt, 0.5);
4983                 dst->vf.when = 0;   /* no time component */
4984             };
4985         } else {
4986             dst->vf.val = DNAN;
4987             dst->vf.when = 0;
4988         }
4989     }
4990         break;
4991     case VDEF_MINIMUM:
4992         step = 0;
4993         while (step != steps && isnan(data[step * src->ds_cnt]))
4994             step++;
4995         if (step == steps) {
4996             dst->vf.val = DNAN;
4997             dst->vf.when = 0;
4998         } else {
4999             dst->vf.val = data[step * src->ds_cnt];
5000             dst->vf.when = src->start + (step + 1) * src->step;
5001         }
5002         while (step != steps) {
5003             if (finite(data[step * src->ds_cnt])) {
5004                 if (data[step * src->ds_cnt] < dst->vf.val) {
5005                     dst->vf.val = data[step * src->ds_cnt];
5006                     dst->vf.when = src->start + (step + 1) * src->step;
5007                 }
5008             }
5009             step++;
5010         }
5011         break;
5012     case VDEF_FIRST:
5013         /* The time value returned here is one step before the
5014          * actual time value.  This is the start of the first
5015          * non-NaN interval.
5016          */
5017         step = 0;
5018         while (step != steps && isnan(data[step * src->ds_cnt]))
5019             step++;
5020         if (step == steps) {    /* all entries were NaN */
5021             dst->vf.val = DNAN;
5022             dst->vf.when = 0;
5023         } else {
5024             dst->vf.val = data[step * src->ds_cnt];
5025             dst->vf.when = src->start + step * src->step;
5026         }
5027         break;
5028     case VDEF_LAST:
5029         /* The time value returned here is the
5030          * actual time value.  This is the end of the last
5031          * non-NaN interval.
5032          */
5033         step = steps - 1;
5034         while (step >= 0 && isnan(data[step * src->ds_cnt]))
5035             step--;
5036         if (step < 0) { /* all entries were NaN */
5037             dst->vf.val = DNAN;
5038             dst->vf.when = 0;
5039         } else {
5040             dst->vf.val = data[step * src->ds_cnt];
5041             dst->vf.when = src->start + (step + 1) * src->step;
5042         }
5043         break;
5044     case VDEF_LSLSLOPE:
5045     case VDEF_LSLINT:
5046     case VDEF_LSLCORREL:{
5047         /* Bestfit line by linear least squares method */
5048
5049         int       cnt = 0;
5050         double    SUMx, SUMy, SUMxy, SUMxx, SUMyy, slope, y_intercept, correl;
5051
5052         SUMx = 0;
5053         SUMy = 0;
5054         SUMxy = 0;
5055         SUMxx = 0;
5056         SUMyy = 0;
5057         for (step = 0; step < steps; step++) {
5058             if (finite(data[step * src->ds_cnt])) {
5059                 cnt++;
5060                 SUMx += step;
5061                 SUMxx += step * step;
5062                 SUMxy += step * data[step * src->ds_cnt];
5063                 SUMy += data[step * src->ds_cnt];
5064                 SUMyy += data[step * src->ds_cnt] * data[step * src->ds_cnt];
5065             };
5066         }
5067
5068         slope = (SUMx * SUMy - cnt * SUMxy) / (SUMx * SUMx - cnt * SUMxx);
5069         y_intercept = (SUMy - slope * SUMx) / cnt;
5070         correl =
5071             (SUMxy -
5072              (SUMx * SUMy) / cnt) /
5073             sqrt((SUMxx -
5074                   (SUMx * SUMx) / cnt) * (SUMyy - (SUMy * SUMy) / cnt));
5075         if (cnt) {
5076             if (dst->vf.op == VDEF_LSLSLOPE) {
5077                 dst->vf.val = slope;
5078                 dst->vf.when = 0;
5079             } else if (dst->vf.op == VDEF_LSLINT) {
5080                 dst->vf.val = y_intercept;
5081                 dst->vf.when = 0;
5082             } else if (dst->vf.op == VDEF_LSLCORREL) {
5083                 dst->vf.val = correl;
5084                 dst->vf.when = 0;
5085             };
5086         } else {
5087             dst->vf.val = DNAN;
5088             dst->vf.when = 0;
5089         }
5090     }
5091         break;
5092     }
5093     return 0;
5094 }
5095
5096 /* NaN < -INF < finite_values < INF */
5097 int vdef_percent_compar(
5098     const void
5099     *a,
5100     const void
5101     *b)
5102 {
5103     /* Equality is not returned; this doesn't hurt except
5104      * (maybe) for a little performance.
5105      */
5106
5107     /* First catch NaN values. They are smallest */
5108     if (isnan(*(double *) a))
5109         return -1;
5110     if (isnan(*(double *) b))
5111         return 1;
5112     /* NaN doesn't reach this part so INF and -INF are extremes.
5113      * The sign from isinf() is compatible with the sign we return
5114      */
5115     if (isinf(*(double *) a))
5116         return isinf(*(double *) a);
5117     if (isinf(*(double *) b))
5118         return isinf(*(double *) b);
5119     /* If we reach this, both values must be finite */
5120     if (*(double *) a < *(double *) b)
5121         return -1;
5122     else
5123         return 1;
5124 }
5125
5126 void grinfo_push(
5127     image_desc_t *im,
5128     char *key,
5129     rrd_info_type_t type,
5130     rrd_infoval_t value)
5131 {
5132     im->grinfo_current = rrd_info_push(im->grinfo_current, key, type, value);
5133     if (im->grinfo == NULL) {
5134         im->grinfo = im->grinfo_current;
5135     }
5136 }