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                 /* make sure transparent colors show up the same way as in the graph */
2741                 gfx_new_area(im,
2742                              X0, Y0 - boxV,
2743                              X0, Y0, X0 + boxH, Y0, im->graph_col[GRC_BACK]);
2744                 gfx_add_point(im, X0 + boxH, Y0 - boxV);
2745                 gfx_close_path(im);
2746                 gfx_new_area(im, X0, Y0 - boxV, X0,
2747                              Y0, X0 + boxH, Y0, im->gdes[i].col);
2748                 gfx_add_point(im, X0 + boxH, Y0 - boxV);
2749                 gfx_close_path(im);
2750                 cairo_save(im->cr);
2751                 cairo_new_path(im->cr);
2752                 cairo_set_line_width(im->cr, 1.0);
2753                 X1 = X0 + boxH;
2754                 Y1 = Y0 - boxV;
2755                 gfx_line_fit(im, &X0, &Y0);
2756                 gfx_line_fit(im, &X1, &Y1);
2757                 cairo_move_to(im->cr, X0, Y0);
2758                 cairo_line_to(im->cr, X1, Y0);
2759                 cairo_line_to(im->cr, X1, Y1);
2760                 cairo_line_to(im->cr, X0, Y1);
2761                 cairo_close_path(im->cr);
2762                 cairo_set_source_rgba(im->cr,
2763                                       im->
2764                                       graph_col
2765                                       [GRC_FRAME].
2766                                       red,
2767                                       im->
2768                                       graph_col
2769                                       [GRC_FRAME].
2770                                       green,
2771                                       im->
2772                                       graph_col
2773                                       [GRC_FRAME].
2774                                       blue, im->graph_col[GRC_FRAME].alpha);
2775                 if (im->gdes[i].dash) {
2776                     /* make box borders in legend dashed if the graph is dashed */
2777                     double    dashes[] = {
2778                         3.0
2779                     };
2780                     cairo_set_dash(im->cr, dashes, 1, 0.0);
2781                 }
2782                 cairo_stroke(im->cr);
2783                 cairo_restore(im->cr);
2784             }
2785         }
2786     }
2787 }
2788
2789
2790 /*****************************************************
2791  * lazy check make sure we rely need to create this graph
2792  *****************************************************/
2793
2794 int lazy_check(
2795     image_desc_t *im)
2796 {
2797     FILE     *fd = NULL;
2798     int       size = 1;
2799     struct stat imgstat;
2800
2801     if (im->lazy == 0)
2802         return 0;       /* no lazy option */
2803     if (strlen(im->graphfile) == 0)
2804         return 0;       /* inmemory option */
2805     if (stat(im->graphfile, &imgstat) != 0)
2806         return 0;       /* can't stat */
2807     /* one pixel in the existing graph is more then what we would
2808        change here ... */
2809     if (time(NULL) - imgstat.st_mtime > (im->end - im->start) / im->xsize)
2810         return 0;
2811     if ((fd = fopen(im->graphfile, "rb")) == NULL)
2812         return 0;       /* the file does not exist */
2813     switch (im->imgformat) {
2814     case IF_PNG:
2815         size = PngSize(fd, &(im->ximg), &(im->yimg));
2816         break;
2817     default:
2818         size = 1;
2819     }
2820     fclose(fd);
2821     return size;
2822 }
2823
2824
2825 int graph_size_location(
2826     image_desc_t
2827     *im,
2828     int elements)
2829 {
2830     /* The actual size of the image to draw is determined from
2831      ** several sources.  The size given on the command line is
2832      ** the graph area but we need more as we have to draw labels
2833      ** and other things outside the graph area. If the option
2834      ** --full-size-mode is selected the size defines the total
2835      ** image size and the size available for the graph is
2836      ** calculated.
2837      */
2838
2839     /** +---+-----------------------------------+
2840      ** | y |...............graph title.........|
2841      ** |   +---+-------------------------------+
2842      ** | a | y |                               |
2843      ** | x |   |                               |
2844      ** | i | a |                               |
2845      ** | s | x |       main graph area         |
2846      ** |   | i |                               |
2847      ** | t | s |                               |
2848      ** | i |   |                               |
2849      ** | t | l |                               |
2850      ** | l | b +-------------------------------+
2851      ** | e | l |       x axis labels           |
2852      ** +---+---+-------------------------------+
2853      ** |....................legends............|
2854      ** +---------------------------------------+
2855      ** |                   watermark           |
2856      ** +---------------------------------------+
2857      */
2858
2859     int       Xvertical = 0, Xvertical2 = 0, Ytitle =
2860         0, Xylabel = 0, Xmain = 0, Ymain =
2861         0, Yxlabel = 0, Xspacing = 15, Yspacing = 15, Ywatermark = 4;
2862
2863     // no legends and no the shall be plotted it's easy
2864     if (im->extra_flags & ONLY_GRAPH) {
2865         im->xorigin = 0;
2866         im->ximg = im->xsize;
2867         im->yimg = im->ysize;
2868         im->yorigin = im->ysize;
2869         ytr(im, DNAN);
2870         return 0;
2871     }
2872
2873     if(im->watermark[0] != '\0') {
2874         Ywatermark = im->text_prop[TEXT_PROP_WATERMARK].size * 2;
2875     }
2876
2877     // calculate the width of the left vertical legend
2878     if (im->ylegend[0] != '\0') {
2879         Xvertical = im->text_prop[TEXT_PROP_UNIT].size * 2;
2880     }
2881
2882     // calculate the width of the right vertical legend
2883     if (im->second_axis_legend[0] != '\0') {
2884         Xvertical2 = im->text_prop[TEXT_PROP_UNIT].size * 2;
2885     }
2886     else{
2887         Xvertical2 = Xspacing;
2888     }
2889
2890     if (im->title[0] != '\0') {
2891         /* The title is placed "inbetween" two text lines so it
2892          ** automatically has some vertical spacing.  The horizontal
2893          ** spacing is added here, on each side.
2894          */
2895         /* if necessary, reduce the font size of the title until it fits the image width */
2896         Ytitle = im->text_prop[TEXT_PROP_TITLE].size * 2.6 + 10;
2897     }
2898     else{
2899         // we have no title; get a little clearing from the top
2900         Ytitle = 1.5 * Yspacing;
2901     }
2902
2903     if (elements) {
2904         if (im->draw_x_grid) {
2905             // calculate the height of the horizontal labelling
2906             Yxlabel = im->text_prop[TEXT_PROP_AXIS].size * 2.5;
2907         }
2908         if (im->draw_y_grid || im->forceleftspace) {
2909             // calculate the width of the vertical labelling
2910             Xylabel =
2911                 gfx_get_text_width(im, 0,
2912                                    im->text_prop[TEXT_PROP_AXIS].font_desc,
2913                                    im->tabwidth, "0") * im->unitslength;
2914         }
2915     }
2916
2917     // add some space to the labelling
2918     Xylabel += Xspacing;
2919
2920     /* If the legend is printed besides the graph the width has to be
2921      ** calculated first. Placing the legend north or south of the
2922      ** graph requires the width calculation first, so the legend is
2923      ** skipped for the moment.
2924      */
2925     im->legendheight = 0;
2926     im->legendwidth = 0;
2927     if (!(im->extra_flags & NOLEGEND)) {
2928         if(im->legendposition == WEST || im->legendposition == EAST){
2929             if (leg_place(im, 1) == -1){
2930                 return -1;
2931             }
2932         }
2933     }
2934
2935     if (im->extra_flags & FULL_SIZE_MODE) {
2936
2937         /* The actual size of the image to draw has been determined by the user.
2938          ** The graph area is the space remaining after accounting for the legend,
2939          ** the watermark, the axis labels, and the title.
2940          */
2941         im->ximg = im->xsize;
2942         im->yimg = im->ysize;
2943         Xmain = im->ximg;
2944         Ymain = im->yimg;
2945
2946         /* Now calculate the total size.  Insert some spacing where
2947            desired.  im->xorigin and im->yorigin need to correspond
2948            with the lower left corner of the main graph area or, if
2949            this one is not set, the imaginary box surrounding the
2950            pie chart area. */
2951         /* Initial size calculation for the main graph area */
2952
2953         Xmain -= Xylabel;// + Xspacing;
2954         if((im->legendposition == WEST || im->legendposition == EAST) && !(im->extra_flags & NOLEGEND) ){
2955             Xmain -= im->legendwidth;// + Xspacing;
2956         }
2957         if (im->second_axis_scale != 0){
2958             Xmain -= Xylabel;
2959         }
2960         if (!(im->extra_flags & NO_RRDTOOL_TAG)){
2961             Xmain -= Xspacing;
2962         }
2963
2964         Xmain -= Xvertical + Xvertical2;
2965
2966         /* limit the remaining space to 0 */
2967         if(Xmain < 1){
2968             Xmain = 1;
2969         }
2970         im->xsize = Xmain;
2971
2972         /* Putting the legend north or south, the height can now be calculated */
2973         if (!(im->extra_flags & NOLEGEND)) {
2974             if(im->legendposition == NORTH || im->legendposition == SOUTH){
2975                 im->legendwidth = im->ximg;
2976                 if (leg_place(im, 0) == -1){
2977                     return -1;
2978                 }
2979             }
2980         }
2981
2982         if( (im->legendposition == NORTH || im->legendposition == SOUTH)  && !(im->extra_flags & NOLEGEND) ){
2983             Ymain -=  Yxlabel + im->legendheight;
2984         }
2985         else{
2986             Ymain -= Yxlabel;
2987         }
2988
2989         /* reserve space for the title *or* some padding above the graph */
2990         Ymain -= Ytitle;
2991
2992             /* reserve space for padding below the graph */
2993         if (im->extra_flags & NOLEGEND) {
2994             Ymain -= Yspacing;
2995         }
2996
2997         if (im->watermark[0] != '\0') {
2998             Ymain -= Ywatermark;
2999         }
3000         /* limit the remaining height to 0 */
3001         if(Ymain < 1){
3002             Ymain = 1;
3003         }
3004         im->ysize = Ymain;
3005     } else {            /* dimension options -width and -height refer to the dimensions of the main graph area */
3006
3007         /* The actual size of the image to draw is determined from
3008          ** several sources.  The size given on the command line is
3009          ** the graph area but we need more as we have to draw labels
3010          ** and other things outside the graph area.
3011          */
3012
3013         if (elements) {
3014             Xmain = im->xsize; // + Xspacing;
3015             Ymain = im->ysize;
3016         }
3017
3018         im->ximg = Xmain + Xylabel;
3019         if (!(im->extra_flags & NO_RRDTOOL_TAG)){
3020             im->ximg += Xspacing;
3021         }
3022
3023         if( (im->legendposition == WEST || im->legendposition == EAST) && !(im->extra_flags & NOLEGEND) ){
3024             im->ximg += im->legendwidth;// + Xspacing;
3025         }
3026         if (im->second_axis_scale != 0){
3027             im->ximg += Xylabel;
3028         }
3029
3030         im->ximg += Xvertical + Xvertical2;
3031
3032         if (!(im->extra_flags & NOLEGEND)) {
3033             if(im->legendposition == NORTH || im->legendposition == SOUTH){
3034                 im->legendwidth = im->ximg;
3035                 if (leg_place(im, 0) == -1){
3036                     return -1;
3037                 }
3038             }
3039         }
3040
3041         im->yimg = Ymain + Yxlabel;
3042         if( (im->legendposition == NORTH || im->legendposition == SOUTH)  && !(im->extra_flags & NOLEGEND) ){
3043              im->yimg += im->legendheight;
3044         }
3045
3046         /* reserve space for the title *or* some padding above the graph */
3047         if (Ytitle) {
3048             im->yimg += Ytitle;
3049         } else {
3050             im->yimg += 1.5 * Yspacing;
3051         }
3052         /* reserve space for padding below the graph */
3053         if (im->extra_flags & NOLEGEND) {
3054             im->yimg += Yspacing;
3055         }
3056
3057         if (im->watermark[0] != '\0') {
3058             im->yimg += Ywatermark;
3059         }
3060     }
3061
3062
3063     /* In case of putting the legend in west or east position the first
3064      ** legend calculation might lead to wrong positions if some items
3065      ** are not aligned on the left hand side (e.g. centered) as the
3066      ** legendwidth wight have been increased after the item was placed.
3067      ** In this case the positions have to be recalculated.
3068      */
3069     if (!(im->extra_flags & NOLEGEND)) {
3070         if(im->legendposition == WEST || im->legendposition == EAST){
3071             if (leg_place(im, 0) == -1){
3072                 return -1;
3073             }
3074         }
3075     }
3076
3077     /* After calculating all dimensions
3078      ** it is now possible to calculate
3079      ** all offsets.
3080      */
3081     switch(im->legendposition){
3082         case NORTH:
3083             im->xOriginTitle   = Xvertical + Xylabel + (im->xsize / 2);
3084             im->yOriginTitle   = 0;
3085
3086             im->xOriginLegend  = 0;
3087             im->yOriginLegend  = Ytitle;
3088
3089             im->xOriginLegendY = 0;
3090             im->yOriginLegendY = Ytitle + im->legendheight + (Ymain / 2) + Yxlabel;
3091
3092             im->xorigin        = Xvertical + Xylabel;
3093             im->yorigin        = Ytitle + im->legendheight + Ymain;
3094
3095             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3096             if (im->second_axis_scale != 0){
3097                 im->xOriginLegendY2 += Xylabel;
3098             }
3099             im->yOriginLegendY2 = Ytitle + im->legendheight + (Ymain / 2) + Yxlabel;
3100
3101             break;
3102
3103         case WEST:
3104             im->xOriginTitle   = im->legendwidth + Xvertical + Xylabel + im->xsize / 2;
3105             im->yOriginTitle   = 0;
3106
3107             im->xOriginLegend  = 0;
3108             im->yOriginLegend  = Ytitle;
3109
3110             im->xOriginLegendY = im->legendwidth;
3111             im->yOriginLegendY = Ytitle + (Ymain / 2);
3112
3113             im->xorigin        = im->legendwidth + Xvertical + Xylabel;
3114             im->yorigin        = Ytitle + Ymain;
3115
3116             im->xOriginLegendY2 = im->legendwidth + Xvertical + Xylabel + Xmain;
3117             if (im->second_axis_scale != 0){
3118                 im->xOriginLegendY2 += Xylabel;
3119             }
3120             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3121
3122             break;
3123
3124         case SOUTH:
3125             im->xOriginTitle   = Xvertical + Xylabel + im->xsize / 2;
3126             im->yOriginTitle   = 0;
3127
3128             im->xOriginLegend  = 0;
3129             im->yOriginLegend  = Ytitle + Ymain + Yxlabel;
3130
3131             im->xOriginLegendY = 0;
3132             im->yOriginLegendY = Ytitle + (Ymain / 2);
3133
3134             im->xorigin        = Xvertical + Xylabel;
3135             im->yorigin        = Ytitle + Ymain;
3136
3137             im->xOriginLegendY2 = 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 EAST:
3146             im->xOriginTitle   = Xvertical + Xylabel + im->xsize / 2;
3147             im->yOriginTitle   = 0;
3148
3149             im->xOriginLegend  = Xvertical + Xylabel + Xmain + Xvertical2;
3150             if (im->second_axis_scale != 0){
3151                 im->xOriginLegend += Xylabel;
3152             }
3153             im->yOriginLegend  = Ytitle;
3154
3155             im->xOriginLegendY = 0;
3156             im->yOriginLegendY = Ytitle + (Ymain / 2);
3157
3158             im->xorigin        = Xvertical + Xylabel;
3159             im->yorigin        = Ytitle + Ymain;
3160
3161             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3162             if (im->second_axis_scale != 0){
3163                 im->xOriginLegendY2 += Xylabel;
3164             }
3165             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3166
3167             if (!(im->extra_flags & NO_RRDTOOL_TAG)){
3168                 im->xOriginTitle    += Xspacing;
3169                 im->xOriginLegend   += Xspacing;
3170                 im->xOriginLegendY  += Xspacing;
3171                 im->xorigin         += Xspacing;
3172                 im->xOriginLegendY2 += Xspacing;
3173             }
3174             break;
3175     }
3176
3177     xtr(im, 0);
3178     ytr(im, DNAN);
3179     return 0;
3180 }
3181
3182 static cairo_status_t cairo_output(
3183     void *closure,
3184     const unsigned char
3185     *data,
3186     unsigned int length)
3187 {
3188     image_desc_t *im = (image_desc_t*)closure;
3189
3190     im->rendered_image =
3191         (unsigned char*)realloc(im->rendered_image, im->rendered_image_size + length);
3192     if (im->rendered_image == NULL)
3193         return CAIRO_STATUS_WRITE_ERROR;
3194     memcpy(im->rendered_image + im->rendered_image_size, data, length);
3195     im->rendered_image_size += length;
3196     return CAIRO_STATUS_SUCCESS;
3197 }
3198
3199 /* draw that picture thing ... */
3200 int graph_paint(
3201     image_desc_t *im)
3202 {
3203     int       i, ii;
3204     int       lazy = lazy_check(im);
3205     double    areazero = 0.0;
3206     graph_desc_t *lastgdes = NULL;
3207     rrd_infoval_t info;
3208
3209 //    PangoFontMap *font_map = pango_cairo_font_map_get_default();
3210
3211     /* pull the data from the rrd files ... */
3212     if (data_fetch(im) == -1)
3213         return -1;
3214     /* evaluate VDEF and CDEF operations ... */
3215     if (data_calc(im) == -1)
3216         return -1;
3217     /* calculate and PRINT and GPRINT definitions. We have to do it at
3218      * this point because it will affect the length of the legends
3219      * if there are no graph elements (i==0) we stop here ...
3220      * if we are lazy, try to quit ...
3221      */
3222     i = print_calc(im);
3223     if (i < 0)
3224         return -1;
3225
3226     /* if we want and can be lazy ... quit now */
3227     if (i == 0)
3228         return 0;
3229
3230 /**************************************************************
3231  *** Calculating sizes and locations became a bit confusing ***
3232  *** so I moved this into a separate function.              ***
3233  **************************************************************/
3234     if (graph_size_location(im, i) == -1)
3235         return -1;
3236
3237     info.u_cnt = im->xorigin;
3238     grinfo_push(im, sprintf_alloc("graph_left"), RD_I_CNT, info);
3239     info.u_cnt = im->yorigin - im->ysize;
3240     grinfo_push(im, sprintf_alloc("graph_top"), RD_I_CNT, info);
3241     info.u_cnt = im->xsize;
3242     grinfo_push(im, sprintf_alloc("graph_width"), RD_I_CNT, info);
3243     info.u_cnt = im->ysize;
3244     grinfo_push(im, sprintf_alloc("graph_height"), RD_I_CNT, info);
3245     info.u_cnt = im->ximg;
3246     grinfo_push(im, sprintf_alloc("image_width"), RD_I_CNT, info);
3247     info.u_cnt = im->yimg;
3248     grinfo_push(im, sprintf_alloc("image_height"), RD_I_CNT, info);
3249     info.u_cnt = im->start;
3250     grinfo_push(im, sprintf_alloc("graph_start"), RD_I_CNT, info);
3251     info.u_cnt = im->end;
3252     grinfo_push(im, sprintf_alloc("graph_end"), RD_I_CNT, info);
3253
3254     /* if we want and can be lazy ... quit now */
3255     if (lazy)
3256         return 0;
3257
3258     /* get actual drawing data and find min and max values */
3259     if (data_proc(im) == -1)
3260         return -1;
3261     if (!im->logarithmic) {
3262         si_unit(im);
3263     }
3264
3265     /* identify si magnitude Kilo, Mega Giga ? */
3266     if (!im->rigid && !im->logarithmic)
3267         expand_range(im);   /* make sure the upper and lower limit are
3268                                sensible values */
3269
3270     info.u_val = im->minval;
3271     grinfo_push(im, sprintf_alloc("value_min"), RD_I_VAL, info);
3272     info.u_val = im->maxval;
3273     grinfo_push(im, sprintf_alloc("value_max"), RD_I_VAL, info);
3274
3275
3276     if (!calc_horizontal_grid(im))
3277         return -1;
3278     /* reset precalc */
3279     ytr(im, DNAN);
3280 /*   if (im->gridfit)
3281      apply_gridfit(im); */
3282     /* the actual graph is created by going through the individual
3283        graph elements and then drawing them */
3284     cairo_surface_destroy(im->surface);
3285     switch (im->imgformat) {
3286     case IF_PNG:
3287         im->surface =
3288             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
3289                                        im->ximg * im->zoom,
3290                                        im->yimg * im->zoom);
3291         break;
3292     case IF_PDF:
3293         im->gridfit = 0;
3294         im->surface = strlen(im->graphfile)
3295             ? cairo_pdf_surface_create(im->graphfile, im->ximg * im->zoom,
3296                                        im->yimg * im->zoom)
3297             : cairo_pdf_surface_create_for_stream
3298             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3299         break;
3300     case IF_EPS:
3301         im->gridfit = 0;
3302         im->surface = strlen(im->graphfile)
3303             ?
3304             cairo_ps_surface_create(im->graphfile, im->ximg * im->zoom,
3305                                     im->yimg * im->zoom)
3306             : cairo_ps_surface_create_for_stream
3307             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3308         break;
3309     case IF_SVG:
3310         im->gridfit = 0;
3311         im->surface = strlen(im->graphfile)
3312             ?
3313             cairo_svg_surface_create(im->
3314                                      graphfile,
3315                                      im->ximg * im->zoom, im->yimg * im->zoom)
3316             : cairo_svg_surface_create_for_stream
3317             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3318         cairo_svg_surface_restrict_to_version
3319             (im->surface, CAIRO_SVG_VERSION_1_1);
3320         break;
3321     };
3322     cairo_destroy(im->cr);
3323     im->cr = cairo_create(im->surface);
3324     cairo_set_antialias(im->cr, im->graph_antialias);
3325     cairo_scale(im->cr, im->zoom, im->zoom);
3326 //    pango_cairo_font_map_set_resolution(PANGO_CAIRO_FONT_MAP(font_map), 100);
3327     gfx_new_area(im, 0, 0, 0, im->yimg,
3328                  im->ximg, im->yimg, im->graph_col[GRC_BACK]);
3329     gfx_add_point(im, im->ximg, 0);
3330     gfx_close_path(im);
3331     gfx_new_area(im, im->xorigin,
3332                  im->yorigin,
3333                  im->xorigin +
3334                  im->xsize, im->yorigin,
3335                  im->xorigin +
3336                  im->xsize,
3337                  im->yorigin - im->ysize, im->graph_col[GRC_CANVAS]);
3338     gfx_add_point(im, im->xorigin, im->yorigin - im->ysize);
3339     gfx_close_path(im);
3340     cairo_rectangle(im->cr, im->xorigin, im->yorigin - im->ysize - 1.0,
3341                     im->xsize, im->ysize + 2.0);
3342     cairo_clip(im->cr);
3343     if (im->minval > 0.0)
3344         areazero = im->minval;
3345     if (im->maxval < 0.0)
3346         areazero = im->maxval;
3347     for (i = 0; i < im->gdes_c; i++) {
3348         switch (im->gdes[i].gf) {
3349         case GF_CDEF:
3350         case GF_VDEF:
3351         case GF_DEF:
3352         case GF_PRINT:
3353         case GF_GPRINT:
3354         case GF_COMMENT:
3355         case GF_TEXTALIGN:
3356         case GF_HRULE:
3357         case GF_VRULE:
3358         case GF_XPORT:
3359         case GF_SHIFT:
3360             break;
3361         case GF_TICK:
3362             for (ii = 0; ii < im->xsize; ii++) {
3363                 if (!isnan(im->gdes[i].p_data[ii])
3364                     && im->gdes[i].p_data[ii] != 0.0) {
3365                     if (im->gdes[i].yrule > 0) {
3366                         gfx_line(im,
3367                                  im->xorigin + ii,
3368                                  im->yorigin + 1.0,
3369                                  im->xorigin + ii,
3370                                  im->yorigin -
3371                                  im->gdes[i].yrule *
3372                                  im->ysize, 1.0, im->gdes[i].col);
3373                     } else if (im->gdes[i].yrule < 0) {
3374                         gfx_line(im,
3375                                  im->xorigin + ii,
3376                                  im->yorigin - im->ysize - 1.0,
3377                                  im->xorigin + ii,
3378                                  im->yorigin - im->ysize -
3379                                                 im->gdes[i].
3380                                                 yrule *
3381                                  im->ysize, 1.0, im->gdes[i].col);
3382                     }
3383                 }
3384             }
3385             break;
3386         case GF_LINE:
3387         case GF_AREA:
3388             /* fix data points at oo and -oo */
3389             for (ii = 0; ii < im->xsize; ii++) {
3390                 if (isinf(im->gdes[i].p_data[ii])) {
3391                     if (im->gdes[i].p_data[ii] > 0) {
3392                         im->gdes[i].p_data[ii] = im->maxval;
3393                     } else {
3394                         im->gdes[i].p_data[ii] = im->minval;
3395                     }
3396
3397                 }
3398             }           /* for */
3399
3400             /* *******************************************************
3401                a           ___. (a,t)
3402                |   |    ___
3403                ____|   |   |   |
3404                |       |___|
3405                -------|--t-1--t--------------------------------
3406
3407                if we know the value at time t was a then
3408                we draw a square from t-1 to t with the value a.
3409
3410                ********************************************************* */
3411             if (im->gdes[i].col.alpha != 0.0) {
3412                 /* GF_LINE and friend */
3413                 if (im->gdes[i].gf == GF_LINE) {
3414                     double    last_y = 0.0;
3415                     int       draw_on = 0;
3416
3417                     cairo_save(im->cr);
3418                     cairo_new_path(im->cr);
3419                     cairo_set_line_width(im->cr, im->gdes[i].linewidth);
3420                     if (im->gdes[i].dash) {
3421                         cairo_set_dash(im->cr,
3422                                        im->gdes[i].p_dashes,
3423                                        im->gdes[i].ndash, im->gdes[i].offset);
3424                     }
3425
3426                     for (ii = 1; ii < im->xsize; ii++) {
3427                         if (isnan(im->gdes[i].p_data[ii])
3428                             || (im->slopemode == 1
3429                                 && isnan(im->gdes[i].p_data[ii - 1]))) {
3430                             draw_on = 0;
3431                             continue;
3432                         }
3433                         if (draw_on == 0) {
3434                             last_y = ytr(im, im->gdes[i].p_data[ii]);
3435                             if (im->slopemode == 0) {
3436                                 double    x = ii - 1 + im->xorigin;
3437                                 double    y = last_y;
3438
3439                                 gfx_line_fit(im, &x, &y);
3440                                 cairo_move_to(im->cr, x, y);
3441                                 x = ii + im->xorigin;
3442                                 y = last_y;
3443                                 gfx_line_fit(im, &x, &y);
3444                                 cairo_line_to(im->cr, x, y);
3445                             } else {
3446                                 double    x = ii - 1 + im->xorigin;
3447                                 double    y =
3448                                     ytr(im, im->gdes[i].p_data[ii - 1]);
3449                                 gfx_line_fit(im, &x, &y);
3450                                 cairo_move_to(im->cr, x, y);
3451                                 x = ii + im->xorigin;
3452                                 y = last_y;
3453                                 gfx_line_fit(im, &x, &y);
3454                                 cairo_line_to(im->cr, x, y);
3455                             }
3456                             draw_on = 1;
3457                         } else {
3458                             double    x1 = ii + im->xorigin;
3459                             double    y1 = ytr(im, im->gdes[i].p_data[ii]);
3460
3461                             if (im->slopemode == 0
3462                                 && !AlmostEqual2sComplement(y1, last_y, 4)) {
3463                                 double    x = ii - 1 + im->xorigin;
3464                                 double    y = y1;
3465
3466                                 gfx_line_fit(im, &x, &y);
3467                                 cairo_line_to(im->cr, x, y);
3468                             };
3469                             last_y = y1;
3470                             gfx_line_fit(im, &x1, &y1);
3471                             cairo_line_to(im->cr, x1, y1);
3472                         };
3473                     }
3474                     cairo_set_source_rgba(im->cr,
3475                                           im->gdes[i].
3476                                           col.red,
3477                                           im->gdes[i].
3478                                           col.green,
3479                                           im->gdes[i].
3480                                           col.blue, im->gdes[i].col.alpha);
3481                     cairo_set_line_cap(im->cr, CAIRO_LINE_CAP_ROUND);
3482                     cairo_set_line_join(im->cr, CAIRO_LINE_JOIN_ROUND);
3483                     cairo_stroke(im->cr);
3484                     cairo_restore(im->cr);
3485                 } else {
3486                     int       idxI = -1;
3487                     double   *foreY =
3488                         (double *) malloc(sizeof(double) * im->xsize * 2);
3489                     double   *foreX =
3490                         (double *) malloc(sizeof(double) * im->xsize * 2);
3491                     double   *backY =
3492                         (double *) malloc(sizeof(double) * im->xsize * 2);
3493                     double   *backX =
3494                         (double *) malloc(sizeof(double) * im->xsize * 2);
3495                     int       drawem = 0;
3496
3497                     for (ii = 0; ii <= im->xsize; ii++) {
3498                         double    ybase, ytop;
3499
3500                         if (idxI > 0 && (drawem != 0 || ii == im->xsize)) {
3501                             int       cntI = 1;
3502                             int       lastI = 0;
3503
3504                             while (cntI < idxI
3505                                    &&
3506                                    AlmostEqual2sComplement(foreY
3507                                                            [lastI],
3508                                                            foreY[cntI], 4)
3509                                    &&
3510                                    AlmostEqual2sComplement(foreY
3511                                                            [lastI],
3512                                                            foreY
3513                                                            [cntI + 1], 4)) {
3514                                 cntI++;
3515                             }
3516                             gfx_new_area(im,
3517                                          backX[0], backY[0],
3518                                          foreX[0], foreY[0],
3519                                          foreX[cntI],
3520                                          foreY[cntI], im->gdes[i].col);
3521                             while (cntI < idxI) {
3522                                 lastI = cntI;
3523                                 cntI++;
3524                                 while (cntI < idxI
3525                                        &&
3526                                        AlmostEqual2sComplement(foreY
3527                                                                [lastI],
3528                                                                foreY[cntI], 4)
3529                                        &&
3530                                        AlmostEqual2sComplement(foreY
3531                                                                [lastI],
3532                                                                foreY
3533                                                                [cntI
3534                                                                 + 1], 4)) {
3535                                     cntI++;
3536                                 }
3537                                 gfx_add_point(im, foreX[cntI], foreY[cntI]);
3538                             }
3539                             gfx_add_point(im, backX[idxI], backY[idxI]);
3540                             while (idxI > 1) {
3541                                 lastI = idxI;
3542                                 idxI--;
3543                                 while (idxI > 1
3544                                        &&
3545                                        AlmostEqual2sComplement(backY
3546                                                                [lastI],
3547                                                                backY[idxI], 4)
3548                                        &&
3549                                        AlmostEqual2sComplement(backY
3550                                                                [lastI],
3551                                                                backY
3552                                                                [idxI
3553                                                                 - 1], 4)) {
3554                                     idxI--;
3555                                 }
3556                                 gfx_add_point(im, backX[idxI], backY[idxI]);
3557                             }
3558                             idxI = -1;
3559                             drawem = 0;
3560                             gfx_close_path(im);
3561                         }
3562                         if (drawem != 0) {
3563                             drawem = 0;
3564                             idxI = -1;
3565                         }
3566                         if (ii == im->xsize)
3567                             break;
3568                         if (im->slopemode == 0 && ii == 0) {
3569                             continue;
3570                         }
3571                         if (isnan(im->gdes[i].p_data[ii])) {
3572                             drawem = 1;
3573                             continue;
3574                         }
3575                         ytop = ytr(im, im->gdes[i].p_data[ii]);
3576                         if (lastgdes && im->gdes[i].stack) {
3577                             ybase = ytr(im, lastgdes->p_data[ii]);
3578                         } else {
3579                             ybase = ytr(im, areazero);
3580                         }
3581                         if (ybase == ytop) {
3582                             drawem = 1;
3583                             continue;
3584                         }
3585
3586                         if (ybase > ytop) {
3587                             double    extra = ytop;
3588
3589                             ytop = ybase;
3590                             ybase = extra;
3591                         }
3592                         if (im->slopemode == 0) {
3593                             backY[++idxI] = ybase - 0.2;
3594                             backX[idxI] = ii + im->xorigin - 1;
3595                             foreY[idxI] = ytop + 0.2;
3596                             foreX[idxI] = ii + im->xorigin - 1;
3597                         }
3598                         backY[++idxI] = ybase - 0.2;
3599                         backX[idxI] = ii + im->xorigin;
3600                         foreY[idxI] = ytop + 0.2;
3601                         foreX[idxI] = ii + im->xorigin;
3602                     }
3603                     /* close up any remaining area */
3604                     free(foreY);
3605                     free(foreX);
3606                     free(backY);
3607                     free(backX);
3608                 }       /* else GF_LINE */
3609             }
3610             /* if color != 0x0 */
3611             /* make sure we do not run into trouble when stacking on NaN */
3612             for (ii = 0; ii < im->xsize; ii++) {
3613                 if (isnan(im->gdes[i].p_data[ii])) {
3614                     if (lastgdes && (im->gdes[i].stack)) {
3615                         im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
3616                     } else {
3617                         im->gdes[i].p_data[ii] = areazero;
3618                     }
3619                 }
3620             }
3621             lastgdes = &(im->gdes[i]);
3622             break;
3623         case GF_STACK:
3624             rrd_set_error
3625                 ("STACK should already be turned into LINE or AREA here");
3626             return -1;
3627             break;
3628         }               /* switch */
3629     }
3630     cairo_reset_clip(im->cr);
3631
3632     /* grid_paint also does the text */
3633     if (!(im->extra_flags & ONLY_GRAPH))
3634         grid_paint(im);
3635     if (!(im->extra_flags & ONLY_GRAPH))
3636         axis_paint(im);
3637     /* the RULES are the last thing to paint ... */
3638     for (i = 0; i < im->gdes_c; i++) {
3639
3640         switch (im->gdes[i].gf) {
3641         case GF_HRULE:
3642             if (im->gdes[i].yrule >= im->minval
3643                 && im->gdes[i].yrule <= im->maxval) {
3644                 cairo_save(im->cr);
3645                 if (im->gdes[i].dash) {
3646                     cairo_set_dash(im->cr,
3647                                    im->gdes[i].p_dashes,
3648                                    im->gdes[i].ndash, im->gdes[i].offset);
3649                 }
3650                 gfx_line(im, im->xorigin,
3651                          ytr(im, im->gdes[i].yrule),
3652                          im->xorigin + im->xsize,
3653                          ytr(im, im->gdes[i].yrule), 1.0, im->gdes[i].col);
3654                 cairo_stroke(im->cr);
3655                 cairo_restore(im->cr);
3656             }
3657             break;
3658         case GF_VRULE:
3659             if (im->gdes[i].xrule >= im->start
3660                 && im->gdes[i].xrule <= im->end) {
3661                 cairo_save(im->cr);
3662                 if (im->gdes[i].dash) {
3663                     cairo_set_dash(im->cr,
3664                                    im->gdes[i].p_dashes,
3665                                    im->gdes[i].ndash, im->gdes[i].offset);
3666                 }
3667                 gfx_line(im,
3668                          xtr(im, im->gdes[i].xrule),
3669                          im->yorigin, xtr(im,
3670                                           im->
3671                                           gdes[i].
3672                                           xrule),
3673                          im->yorigin - im->ysize, 1.0, im->gdes[i].col);
3674                 cairo_stroke(im->cr);
3675                 cairo_restore(im->cr);
3676             }
3677             break;
3678         default:
3679             break;
3680         }
3681     }
3682
3683
3684     switch (im->imgformat) {
3685     case IF_PNG:
3686     {
3687         cairo_status_t status;
3688
3689         status = strlen(im->graphfile) ?
3690             cairo_surface_write_to_png(im->surface, im->graphfile)
3691             : cairo_surface_write_to_png_stream(im->surface, &cairo_output,
3692                                                 im);
3693
3694         if (status != CAIRO_STATUS_SUCCESS) {
3695             rrd_set_error("Could not save png to '%s'", im->graphfile);
3696             return 1;
3697         }
3698         break;
3699     }
3700     default:
3701         if (strlen(im->graphfile)) {
3702             cairo_show_page(im->cr);
3703         } else {
3704             cairo_surface_finish(im->surface);
3705         }
3706         break;
3707     }
3708
3709     return 0;
3710 }
3711
3712
3713 /*****************************************************
3714  * graph stuff
3715  *****************************************************/
3716
3717 int gdes_alloc(
3718     image_desc_t *im)
3719 {
3720
3721     im->gdes_c++;
3722     if ((im->gdes = (graph_desc_t *)
3723          rrd_realloc(im->gdes, (im->gdes_c)
3724                      * sizeof(graph_desc_t))) == NULL) {
3725         rrd_set_error("realloc graph_descs");
3726         return -1;
3727     }
3728
3729
3730     im->gdes[im->gdes_c - 1].step = im->step;
3731     im->gdes[im->gdes_c - 1].step_orig = im->step;
3732     im->gdes[im->gdes_c - 1].stack = 0;
3733     im->gdes[im->gdes_c - 1].linewidth = 0;
3734     im->gdes[im->gdes_c - 1].debug = 0;
3735     im->gdes[im->gdes_c - 1].start = im->start;
3736     im->gdes[im->gdes_c - 1].start_orig = im->start;
3737     im->gdes[im->gdes_c - 1].end = im->end;
3738     im->gdes[im->gdes_c - 1].end_orig = im->end;
3739     im->gdes[im->gdes_c - 1].vname[0] = '\0';
3740     im->gdes[im->gdes_c - 1].data = NULL;
3741     im->gdes[im->gdes_c - 1].ds_namv = NULL;
3742     im->gdes[im->gdes_c - 1].data_first = 0;
3743     im->gdes[im->gdes_c - 1].p_data = NULL;
3744     im->gdes[im->gdes_c - 1].rpnp = NULL;
3745     im->gdes[im->gdes_c - 1].p_dashes = NULL;
3746     im->gdes[im->gdes_c - 1].shift = 0.0;
3747     im->gdes[im->gdes_c - 1].dash = 0;
3748     im->gdes[im->gdes_c - 1].ndash = 0;
3749     im->gdes[im->gdes_c - 1].offset = 0;
3750     im->gdes[im->gdes_c - 1].col.red = 0.0;
3751     im->gdes[im->gdes_c - 1].col.green = 0.0;
3752     im->gdes[im->gdes_c - 1].col.blue = 0.0;
3753     im->gdes[im->gdes_c - 1].col.alpha = 0.0;
3754     im->gdes[im->gdes_c - 1].legend[0] = '\0';
3755     im->gdes[im->gdes_c - 1].format[0] = '\0';
3756     im->gdes[im->gdes_c - 1].strftm = 0;
3757     im->gdes[im->gdes_c - 1].rrd[0] = '\0';
3758     im->gdes[im->gdes_c - 1].ds = -1;
3759     im->gdes[im->gdes_c - 1].cf_reduce = CF_AVERAGE;
3760     im->gdes[im->gdes_c - 1].cf = CF_AVERAGE;
3761     im->gdes[im->gdes_c - 1].yrule = DNAN;
3762     im->gdes[im->gdes_c - 1].xrule = 0;
3763     return 0;
3764 }
3765
3766 /* copies input untill the first unescaped colon is found
3767    or until input ends. backslashes have to be escaped as well */
3768 int scan_for_col(
3769     const char *const input,
3770     int len,
3771     char *const output)
3772 {
3773     int       inp, outp = 0;
3774
3775     for (inp = 0; inp < len && input[inp] != ':' && input[inp] != '\0'; inp++) {
3776         if (input[inp] == '\\'
3777             && input[inp + 1] != '\0'
3778             && (input[inp + 1] == '\\' || input[inp + 1] == ':')) {
3779             output[outp++] = input[++inp];
3780         } else {
3781             output[outp++] = input[inp];
3782         }
3783     }
3784     output[outp] = '\0';
3785     return inp;
3786 }
3787
3788 /* Now just a wrapper around rrd_graph_v */
3789 int rrd_graph(
3790     int argc,
3791     char **argv,
3792     char ***prdata,
3793     int *xsize,
3794     int *ysize,
3795     FILE * stream,
3796     double *ymin,
3797     double *ymax)
3798 {
3799     int       prlines = 0;
3800     rrd_info_t *grinfo = NULL;
3801     rrd_info_t *walker;
3802
3803     grinfo = rrd_graph_v(argc, argv);
3804     if (grinfo == NULL)
3805         return -1;
3806     walker = grinfo;
3807     (*prdata) = NULL;
3808     while (walker) {
3809         if (strcmp(walker->key, "image_info") == 0) {
3810             prlines++;
3811             if (((*prdata) =
3812                  (char**)rrd_realloc((*prdata),
3813                              (prlines + 1) * sizeof(char *))) == NULL) {
3814                 rrd_set_error("realloc prdata");
3815                 return 0;
3816             }
3817             /* imginfo goes to position 0 in the prdata array */
3818             (*prdata)[prlines - 1] = (char*)malloc((strlen(walker->value.u_str)
3819                                              + 2) * sizeof(char));
3820             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3821             (*prdata)[prlines] = NULL;
3822         }
3823         /* skip anything else */
3824         walker = walker->next;
3825     }
3826     walker = grinfo;
3827     *xsize = 0;
3828     *ysize = 0;
3829     *ymin = 0;
3830     *ymax = 0;
3831     while (walker) {
3832         if (strcmp(walker->key, "image_width") == 0) {
3833             *xsize = walker->value.u_cnt;
3834         } else if (strcmp(walker->key, "image_height") == 0) {
3835             *ysize = walker->value.u_cnt;
3836         } else if (strcmp(walker->key, "value_min") == 0) {
3837             *ymin = walker->value.u_val;
3838         } else if (strcmp(walker->key, "value_max") == 0) {
3839             *ymax = walker->value.u_val;
3840         } else if (strncmp(walker->key, "print", 5) == 0) { /* keys are prdate[0..] */
3841             prlines++;
3842             if (((*prdata) =
3843                  (char**)rrd_realloc((*prdata),
3844                              (prlines + 1) * sizeof(char *))) == NULL) {
3845                 rrd_set_error("realloc prdata");
3846                 return 0;
3847             }
3848             (*prdata)[prlines - 1] = (char*)malloc((strlen(walker->value.u_str)
3849                                              + 2) * sizeof(char));
3850             (*prdata)[prlines] = NULL;
3851             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3852         } else if (strcmp(walker->key, "image") == 0) {
3853             if ( fwrite(walker->value.u_blo.ptr, walker->value.u_blo.size, 1,
3854                    (stream ? stream : stdout)) == 0 && ferror(stream ? stream : stdout)){
3855                 rrd_set_error("writing image");
3856                 return 0;
3857             }
3858         }
3859         /* skip anything else */
3860         walker = walker->next;
3861     }
3862     rrd_info_free(grinfo);
3863     return 0;
3864 }
3865
3866
3867 /* Some surgery done on this function, it became ridiculously big.
3868 ** Things moved:
3869 ** - initializing     now in rrd_graph_init()
3870 ** - options parsing  now in rrd_graph_options()
3871 ** - script parsing   now in rrd_graph_script()
3872 */
3873 rrd_info_t *rrd_graph_v(
3874     int argc,
3875     char **argv)
3876 {
3877     image_desc_t im;
3878     rrd_info_t *grinfo;
3879     rrd_graph_init(&im);
3880     /* a dummy surface so that we can measure text sizes for placements */
3881
3882     rrd_graph_options(argc, argv, &im);
3883     if (rrd_test_error()) {
3884         rrd_info_free(im.grinfo);
3885         im_free(&im);
3886         return NULL;
3887     }
3888
3889     if (optind >= argc) {
3890         rrd_info_free(im.grinfo);
3891         im_free(&im);
3892         rrd_set_error("missing filename");
3893         return NULL;
3894     }
3895
3896     if (strlen(argv[optind]) >= MAXPATH) {
3897         rrd_set_error("filename (including path) too long");
3898         rrd_info_free(im.grinfo);
3899         im_free(&im);
3900         return NULL;
3901     }
3902
3903     strncpy(im.graphfile, argv[optind], MAXPATH - 1);
3904     im.graphfile[MAXPATH - 1] = '\0';
3905
3906     if (strcmp(im.graphfile, "-") == 0) {
3907         im.graphfile[0] = '\0';
3908     }
3909
3910     rrd_graph_script(argc, argv, &im, 1);
3911     if (rrd_test_error()) {
3912         rrd_info_free(im.grinfo);
3913         im_free(&im);
3914         return NULL;
3915     }
3916
3917     /* Everything is now read and the actual work can start */
3918
3919     if (graph_paint(&im) == -1) {
3920         rrd_info_free(im.grinfo);
3921         im_free(&im);
3922         return NULL;
3923     }
3924
3925
3926     /* The image is generated and needs to be output.
3927      ** Also, if needed, print a line with information about the image.
3928      */
3929
3930     if (im.imginfo) {
3931         rrd_infoval_t info;
3932         char     *path;
3933         char     *filename;
3934
3935         path = strdup(im.graphfile);
3936         filename = basename(path);
3937         info.u_str =
3938             sprintf_alloc(im.imginfo,
3939                           filename,
3940                           (long) (im.zoom *
3941                                   im.ximg), (long) (im.zoom * im.yimg));
3942         grinfo_push(&im, sprintf_alloc("image_info"), RD_I_STR, info);
3943         free(info.u_str);
3944         free(path);
3945     }
3946     if (im.rendered_image) {
3947         rrd_infoval_t img;
3948
3949         img.u_blo.size = im.rendered_image_size;
3950         img.u_blo.ptr = im.rendered_image;
3951         grinfo_push(&im, sprintf_alloc("image"), RD_I_BLO, img);
3952     }
3953     grinfo = im.grinfo;
3954     im_free(&im);
3955     return grinfo;
3956 }
3957
3958 static void
3959 rrd_set_font_desc (
3960     image_desc_t *im,int prop,char *font, double size ){
3961     if (font){
3962         strncpy(im->text_prop[prop].font, font, sizeof(text_prop[prop].font) - 1);
3963         im->text_prop[prop].font[sizeof(text_prop[prop].font) - 1] = '\0';
3964         im->text_prop[prop].font_desc = pango_font_description_from_string( font );
3965     };
3966     if (size > 0){
3967         im->text_prop[prop].size = size;
3968     };
3969     if (im->text_prop[prop].font_desc && im->text_prop[prop].size ){
3970         pango_font_description_set_size(im->text_prop[prop].font_desc, im->text_prop[prop].size * PANGO_SCALE);
3971     };
3972 }
3973
3974 void rrd_graph_init(
3975     image_desc_t
3976     *im)
3977 {
3978     unsigned int i;
3979     char     *deffont = getenv("RRD_DEFAULT_FONT");
3980     static PangoFontMap *fontmap = NULL;
3981     PangoContext *context;
3982
3983 #ifdef HAVE_TZSET
3984     tzset();
3985 #endif
3986 #ifdef HAVE_SETLOCALE
3987     setlocale(LC_TIME, "");
3988 #ifdef HAVE_MBSTOWCS
3989     setlocale(LC_CTYPE, "");
3990 #endif
3991 #endif
3992     im->base = 1000;
3993     im->daemon_addr = NULL;
3994     im->draw_x_grid = 1;
3995     im->draw_y_grid = 1;
3996     im->draw_3d_border = 2;
3997     im->extra_flags = 0;
3998     im->font_options = cairo_font_options_create();
3999     im->forceleftspace = 0;
4000     im->gdes_c = 0;
4001     im->gdes = NULL;
4002     im->graph_antialias = CAIRO_ANTIALIAS_GRAY;
4003     im->grid_dash_off = 1;
4004     im->grid_dash_on = 1;
4005     im->gridfit = 1;
4006     im->grinfo = (rrd_info_t *) NULL;
4007     im->grinfo_current = (rrd_info_t *) NULL;
4008     im->imgformat = IF_PNG;
4009     im->imginfo = NULL;
4010     im->lazy = 0;
4011     im->legenddirection = TOP_DOWN;
4012     im->legendheight = 0;
4013     im->legendposition = SOUTH;
4014     im->legendwidth = 0;
4015     im->logarithmic = 0;
4016     im->maxval = DNAN;
4017     im->minval = 0;
4018     im->minval = DNAN;
4019     im->prt_c = 0;
4020     im->rigid = 0;
4021     im->rendered_image_size = 0;
4022     im->rendered_image = NULL;
4023     im->slopemode = 0;
4024     im->step = 0;
4025     im->symbol = ' ';
4026     im->tabwidth = 40.0;
4027     im->title[0] = '\0';
4028     im->unitsexponent = 9999;
4029     im->unitslength = 6;
4030     im->viewfactor = 1.0;
4031     im->watermark[0] = '\0';
4032     im->with_markup = 0;
4033     im->ximg = 0;
4034     im->xlab_user.minsec = -1;
4035     im->xorigin = 0;
4036     im->xOriginLegend = 0;
4037     im->xOriginLegendY = 0;
4038     im->xOriginLegendY2 = 0;
4039     im->xOriginTitle = 0;
4040     im->xsize = 400;
4041     im->ygridstep = DNAN;
4042     im->yimg = 0;
4043     im->ylegend[0] = '\0';
4044     im->second_axis_scale = 0; /* 0 disables it */
4045     im->second_axis_shift = 0; /* no shift by default */
4046     im->second_axis_legend[0] = '\0';
4047     im->second_axis_format[0] = '\0';
4048     im->yorigin = 0;
4049     im->yOriginLegend = 0;
4050     im->yOriginLegendY = 0;
4051     im->yOriginLegendY2 = 0;
4052     im->yOriginTitle = 0;
4053     im->ysize = 100;
4054     im->zoom = 1;
4055
4056     im->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 10, 10);
4057     im->cr = cairo_create(im->surface);
4058
4059     for (i = 0; i < DIM(text_prop); i++) {
4060         im->text_prop[i].size = -1;
4061         rrd_set_font_desc(im,i, deffont ? deffont : text_prop[i].font,text_prop[i].size);
4062     }
4063
4064     if (fontmap == NULL){
4065         fontmap = pango_cairo_font_map_get_default();
4066     }
4067
4068     context =  pango_cairo_font_map_create_context((PangoCairoFontMap*)fontmap);
4069
4070     pango_cairo_context_set_resolution(context, 100);
4071
4072     pango_cairo_update_context(im->cr,context);
4073
4074     im->layout = pango_layout_new(context);
4075
4076 //  im->layout = pango_cairo_create_layout(im->cr);
4077
4078
4079     cairo_font_options_set_hint_style
4080         (im->font_options, CAIRO_HINT_STYLE_FULL);
4081     cairo_font_options_set_hint_metrics
4082         (im->font_options, CAIRO_HINT_METRICS_ON);
4083     cairo_font_options_set_antialias(im->font_options, CAIRO_ANTIALIAS_GRAY);
4084
4085
4086
4087     for (i = 0; i < DIM(graph_col); i++)
4088         im->graph_col[i] = graph_col[i];
4089
4090
4091 }
4092
4093
4094 void rrd_graph_options(
4095     int argc,
4096     char *argv[],
4097     image_desc_t
4098     *im)
4099 {
4100     int       stroff;
4101     char     *parsetime_error = NULL;
4102     char      scan_gtm[12], scan_mtm[12], scan_ltm[12], col_nam[12];
4103     time_t    start_tmp = 0, end_tmp = 0;
4104     long      long_tmp;
4105     rrd_time_value_t start_tv, end_tv;
4106     long unsigned int color;
4107     char     *old_locale = "";
4108
4109     /* defines for long options without a short equivalent. should be bytes,
4110        and may not collide with (the ASCII value of) short options */
4111 #define LONGOPT_UNITS_SI 255
4112
4113 /* *INDENT-OFF* */
4114     struct option long_options[] = {
4115         { "alt-autoscale",      no_argument,       0, 'A'},
4116         { "imgformat",          required_argument, 0, 'a'},
4117         { "font-smoothing-threshold", required_argument, 0, 'B'},
4118         { "base",               required_argument, 0, 'b'},
4119         { "color",              required_argument, 0, 'c'},
4120         { "full-size-mode",     no_argument,       0, 'D'},
4121         { "daemon",             required_argument, 0, 'd'},
4122         { "slope-mode",         no_argument,       0, 'E'},
4123         { "end",                required_argument, 0, 'e'},
4124         { "force-rules-legend", no_argument,       0, 'F'},
4125         { "imginfo",            required_argument, 0, 'f'},
4126         { "graph-render-mode",  required_argument, 0, 'G'},
4127         { "no-legend",          no_argument,       0, 'g'},
4128         { "height",             required_argument, 0, 'h'},
4129         { "no-minor",           no_argument,       0, 'I'},
4130         { "interlaced",         no_argument,       0, 'i'},
4131         { "alt-autoscale-min",  no_argument,       0, 'J'},
4132         { "only-graph",         no_argument,       0, 'j'},
4133         { "units-length",       required_argument, 0, 'L'},
4134         { "lower-limit",        required_argument, 0, 'l'},
4135         { "alt-autoscale-max",  no_argument,       0, 'M'},
4136         { "zoom",               required_argument, 0, 'm'},
4137         { "no-gridfit",         no_argument,       0, 'N'},
4138         { "font",               required_argument, 0, 'n'},
4139         { "logarithmic",        no_argument,       0, 'o'},
4140         { "pango-markup",       no_argument,       0, 'P'},
4141         { "font-render-mode",   required_argument, 0, 'R'},
4142         { "rigid",              no_argument,       0, 'r'},
4143         { "step",               required_argument, 0, 'S'},
4144         { "start",              required_argument, 0, 's'},
4145         { "tabwidth",           required_argument, 0, 'T'},
4146         { "title",              required_argument, 0, 't'},
4147         { "upper-limit",        required_argument, 0, 'u'},
4148         { "vertical-label",     required_argument, 0, 'v'},
4149         { "watermark",          required_argument, 0, 'W'},
4150         { "width",              required_argument, 0, 'w'},
4151         { "units-exponent",     required_argument, 0, 'X'},
4152         { "x-grid",             required_argument, 0, 'x'},
4153         { "alt-y-grid",         no_argument,       0, 'Y'},
4154         { "y-grid",             required_argument, 0, 'y'},
4155         { "lazy",               no_argument,       0, 'z'},
4156         { "units",              required_argument, 0, LONGOPT_UNITS_SI},
4157         { "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 */
4158         { "disable-rrdtool-tag",no_argument,       0, 1001},
4159         { "right-axis",         required_argument, 0, 1002},
4160         { "right-axis-label",   required_argument, 0, 1003},
4161         { "right-axis-format",  required_argument, 0, 1004},
4162         { "legend-position",    required_argument, 0, 1005},
4163         { "legend-direction",   required_argument, 0, 1006},
4164         { "border",             required_argument, 0, 1007},
4165         {  0, 0, 0, 0}
4166 };
4167 /* *INDENT-ON* */
4168
4169     optind = 0;
4170     opterr = 0;         /* initialize getopt */
4171     rrd_parsetime("end-24h", &start_tv);
4172     rrd_parsetime("now", &end_tv);
4173     while (1) {
4174         int       option_index = 0;
4175         int       opt;
4176         int       col_start, col_end;
4177
4178         opt = getopt_long(argc, argv,
4179                           "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",
4180                           long_options, &option_index);
4181         if (opt == EOF)
4182             break;
4183         switch (opt) {
4184         case 'I':
4185             im->extra_flags |= NOMINOR;
4186             break;
4187         case 'Y':
4188             im->extra_flags |= ALTYGRID;
4189             break;
4190         case 'A':
4191             im->extra_flags |= ALTAUTOSCALE;
4192             break;
4193         case 'J':
4194             im->extra_flags |= ALTAUTOSCALE_MIN;
4195             break;
4196         case 'M':
4197             im->extra_flags |= ALTAUTOSCALE_MAX;
4198             break;
4199         case 'j':
4200             im->extra_flags |= ONLY_GRAPH;
4201             break;
4202         case 'g':
4203             im->extra_flags |= NOLEGEND;
4204             break;
4205         case 1005:
4206             if (strcmp(optarg, "north") == 0) {
4207                 im->legendposition = NORTH;
4208             } else if (strcmp(optarg, "west") == 0) {
4209                 im->legendposition = WEST;
4210             } else if (strcmp(optarg, "south") == 0) {
4211                 im->legendposition = SOUTH;
4212             } else if (strcmp(optarg, "east") == 0) {
4213                 im->legendposition = EAST;
4214             } else {
4215                 rrd_set_error("unknown legend-position '%s'", optarg);
4216                 return;
4217             }
4218             break;
4219         case 1006:
4220             if (strcmp(optarg, "topdown") == 0) {
4221                 im->legenddirection = TOP_DOWN;
4222             } else if (strcmp(optarg, "bottomup") == 0) {
4223                 im->legenddirection = BOTTOM_UP;
4224             } else {
4225                 rrd_set_error("unknown legend-position '%s'", optarg);
4226                 return;
4227             }
4228             break;
4229         case 'F':
4230             im->extra_flags |= FORCE_RULES_LEGEND;
4231             break;
4232         case 1001:
4233             im->extra_flags |= NO_RRDTOOL_TAG;
4234             break;
4235         case LONGOPT_UNITS_SI:
4236             if (im->extra_flags & FORCE_UNITS) {
4237                 rrd_set_error("--units can only be used once!");
4238                 setlocale(LC_NUMERIC, old_locale);
4239                 return;
4240             }
4241             if (strcmp(optarg, "si") == 0)
4242                 im->extra_flags |= FORCE_UNITS_SI;
4243             else {
4244                 rrd_set_error("invalid argument for --units: %s", optarg);
4245                 return;
4246             }
4247             break;
4248         case 'X':
4249             im->unitsexponent = atoi(optarg);
4250             break;
4251         case 'L':
4252             im->unitslength = atoi(optarg);
4253             im->forceleftspace = 1;
4254             break;
4255         case 'T':
4256             old_locale = setlocale(LC_NUMERIC, "C");
4257             im->tabwidth = atof(optarg);
4258             setlocale(LC_NUMERIC, old_locale);
4259             break;
4260         case 'S':
4261             old_locale = setlocale(LC_NUMERIC, "C");
4262             im->step = atoi(optarg);
4263             setlocale(LC_NUMERIC, old_locale);
4264             break;
4265         case 'N':
4266             im->gridfit = 0;
4267             break;
4268         case 'P':
4269             im->with_markup = 1;
4270             break;
4271         case 's':
4272             if ((parsetime_error = rrd_parsetime(optarg, &start_tv))) {
4273                 rrd_set_error("start time: %s", parsetime_error);
4274                 return;
4275             }
4276             break;
4277         case 'e':
4278             if ((parsetime_error = rrd_parsetime(optarg, &end_tv))) {
4279                 rrd_set_error("end time: %s", parsetime_error);
4280                 return;
4281             }
4282             break;
4283         case 'x':
4284             if (strcmp(optarg, "none") == 0) {
4285                 im->draw_x_grid = 0;
4286                 break;
4287             };
4288             if (sscanf(optarg,
4289                        "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
4290                        scan_gtm,
4291                        &im->xlab_user.gridst,
4292                        scan_mtm,
4293                        &im->xlab_user.mgridst,
4294                        scan_ltm,
4295                        &im->xlab_user.labst,
4296                        &im->xlab_user.precis, &stroff) == 7 && stroff != 0) {
4297                 strncpy(im->xlab_form, optarg + stroff,
4298                         sizeof(im->xlab_form) - 1);
4299                 im->xlab_form[sizeof(im->xlab_form) - 1] = '\0';
4300                 if ((int)
4301                     (im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1) {
4302                     rrd_set_error("unknown keyword %s", scan_gtm);
4303                     return;
4304                 } else if ((int)
4305                            (im->xlab_user.mgridtm = tmt_conv(scan_mtm))
4306                            == -1) {
4307                     rrd_set_error("unknown keyword %s", scan_mtm);
4308                     return;
4309                 } else if ((int)
4310                            (im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1) {
4311                     rrd_set_error("unknown keyword %s", scan_ltm);
4312                     return;
4313                 }
4314                 im->xlab_user.minsec = 1;
4315                 im->xlab_user.stst = im->xlab_form;
4316             } else {
4317                 rrd_set_error("invalid x-grid format");
4318                 return;
4319             }
4320             break;
4321         case 'y':
4322
4323             if (strcmp(optarg, "none") == 0) {
4324                 im->draw_y_grid = 0;
4325                 break;
4326             };
4327             old_locale = setlocale(LC_NUMERIC, "C");
4328             if (sscanf(optarg, "%lf:%d", &im->ygridstep, &im->ylabfact) == 2) {
4329                 setlocale(LC_NUMERIC, old_locale);
4330                 if (im->ygridstep <= 0) {
4331                     rrd_set_error("grid step must be > 0");
4332                     return;
4333                 } else if (im->ylabfact < 1) {
4334                     rrd_set_error("label factor must be > 0");
4335                     return;
4336                 }
4337             } else {
4338                 setlocale(LC_NUMERIC, old_locale);
4339                 rrd_set_error("invalid y-grid format");
4340                 return;
4341             }
4342             break;
4343         case 1007:
4344             im->draw_3d_border = atoi(optarg);
4345             break;
4346         case 1002: /* right y axis */
4347
4348             if(sscanf(optarg,
4349                       "%lf:%lf",
4350                       &im->second_axis_scale,
4351                       &im->second_axis_shift) == 2) {
4352                 if(im->second_axis_scale==0){
4353                     rrd_set_error("the second_axis_scale  must not be 0");
4354                     return;
4355                 }
4356             } else {
4357                 rrd_set_error("invalid right-axis format expected scale:shift");
4358                 return;
4359             }
4360             break;
4361         case 1003:
4362             strncpy(im->second_axis_legend,optarg,150);
4363             im->second_axis_legend[150]='\0';
4364             break;
4365         case 1004:
4366             if (bad_format(optarg)){
4367                 rrd_set_error("use either %le or %lf formats");
4368                 return;
4369             }
4370             strncpy(im->second_axis_format,optarg,150);
4371             im->second_axis_format[150]='\0';
4372             break;
4373         case 'v':
4374             strncpy(im->ylegend, optarg, 150);
4375             im->ylegend[150] = '\0';
4376             break;
4377         case 'u':
4378             old_locale = setlocale(LC_NUMERIC, "C");
4379             im->maxval = atof(optarg);
4380             setlocale(LC_NUMERIC, old_locale);
4381             break;
4382         case 'l':
4383             old_locale = setlocale(LC_NUMERIC, "C");
4384             im->minval = atof(optarg);
4385             setlocale(LC_NUMERIC, old_locale);
4386             break;
4387         case 'b':
4388             im->base = atol(optarg);
4389             if (im->base != 1024 && im->base != 1000) {
4390                 rrd_set_error
4391                     ("the only sensible value for base apart from 1000 is 1024");
4392                 return;
4393             }
4394             break;
4395         case 'w':
4396             long_tmp = atol(optarg);
4397             if (long_tmp < 10) {
4398                 rrd_set_error("width below 10 pixels");
4399                 return;
4400             }
4401             im->xsize = long_tmp;
4402             break;
4403         case 'h':
4404             long_tmp = atol(optarg);
4405             if (long_tmp < 10) {
4406                 rrd_set_error("height below 10 pixels");
4407                 return;
4408             }
4409             im->ysize = long_tmp;
4410             break;
4411         case 'D':
4412             im->extra_flags |= FULL_SIZE_MODE;
4413             break;
4414         case 'i':
4415             /* interlaced png not supported at the moment */
4416             break;
4417         case 'r':
4418             im->rigid = 1;
4419             break;
4420         case 'f':
4421             im->imginfo = optarg;
4422             break;
4423         case 'a':
4424             if ((int)
4425                 (im->imgformat = if_conv(optarg)) == -1) {
4426                 rrd_set_error("unsupported graphics format '%s'", optarg);
4427                 return;
4428             }
4429             break;
4430         case 'z':
4431             im->lazy = 1;
4432             break;
4433         case 'E':
4434             im->slopemode = 1;
4435             break;
4436         case 'o':
4437             im->logarithmic = 1;
4438             break;
4439         case 'c':
4440             if (sscanf(optarg,
4441                        "%10[A-Z]#%n%8lx%n",
4442                        col_nam, &col_start, &color, &col_end) == 2) {
4443                 int       ci;
4444                 int       col_len = col_end - col_start;
4445
4446                 switch (col_len) {
4447                 case 3:
4448                     color =
4449                         (((color & 0xF00) * 0x110000) | ((color & 0x0F0) *
4450                                                          0x011000) |
4451                          ((color & 0x00F)
4452                           * 0x001100)
4453                          | 0x000000FF);
4454                     break;
4455                 case 4:
4456                     color =
4457                         (((color & 0xF000) *
4458                           0x11000) | ((color & 0x0F00) *
4459                                       0x01100) | ((color &
4460                                                    0x00F0) *
4461                                                   0x00110) |
4462                          ((color & 0x000F) * 0x00011)
4463                         );
4464                     break;
4465                 case 6:
4466                     color = (color << 8) + 0xff /* shift left by 8 */ ;
4467                     break;
4468                 case 8:
4469                     break;
4470                 default:
4471                     rrd_set_error("the color format is #RRGGBB[AA]");
4472                     return;
4473                 }
4474                 if ((ci = grc_conv(col_nam)) != -1) {
4475                     im->graph_col[ci] = gfx_hex_to_col(color);
4476                 } else {
4477                     rrd_set_error("invalid color name '%s'", col_nam);
4478                     return;
4479                 }
4480             } else {
4481                 rrd_set_error("invalid color def format");
4482                 return;
4483             }
4484             break;
4485         case 'n':{
4486             char      prop[15];
4487             double    size = 1;
4488             int       end;
4489
4490             old_locale = setlocale(LC_NUMERIC, "C");
4491             if (sscanf(optarg, "%10[A-Z]:%lf%n", prop, &size, &end) >= 2) {
4492                 int       sindex, propidx;
4493
4494                 setlocale(LC_NUMERIC, old_locale);
4495                 if ((sindex = text_prop_conv(prop)) != -1) {
4496                     for (propidx = sindex;
4497                          propidx < TEXT_PROP_LAST; propidx++) {
4498                         if (size > 0) {
4499                             rrd_set_font_desc(im,propidx,NULL,size);
4500                         }
4501                         if ((int) strlen(optarg) > end+2) {
4502                             if (optarg[end] == ':') {
4503                                 rrd_set_font_desc(im,propidx,optarg + end + 1,0);
4504                             } else {
4505                                 rrd_set_error
4506                                     ("expected : after font size in '%s'",
4507                                      optarg);
4508                                 return;
4509                             }
4510                         }
4511                         /* only run the for loop for DEFAULT (0) for
4512                            all others, we break here. woodo programming */
4513                         if (propidx == sindex && sindex != 0)
4514                             break;
4515                     }
4516                 } else {
4517                     rrd_set_error("invalid fonttag '%s'", prop);
4518                     return;
4519                 }
4520             } else {
4521                 setlocale(LC_NUMERIC, old_locale);
4522                 rrd_set_error("invalid text property format");
4523                 return;
4524             }
4525             break;
4526         }
4527         case 'm':
4528             old_locale = setlocale(LC_NUMERIC, "C");
4529             im->zoom = atof(optarg);
4530             setlocale(LC_NUMERIC, old_locale);
4531             if (im->zoom <= 0.0) {
4532                 rrd_set_error("zoom factor must be > 0");
4533                 return;
4534             }
4535             break;
4536         case 't':
4537             strncpy(im->title, optarg, 150);
4538             im->title[150] = '\0';
4539             break;
4540         case 'R':
4541             if (strcmp(optarg, "normal") == 0) {
4542                 cairo_font_options_set_antialias
4543                     (im->font_options, CAIRO_ANTIALIAS_GRAY);
4544                 cairo_font_options_set_hint_style
4545                     (im->font_options, CAIRO_HINT_STYLE_FULL);
4546             } else if (strcmp(optarg, "light") == 0) {
4547                 cairo_font_options_set_antialias
4548                     (im->font_options, CAIRO_ANTIALIAS_GRAY);
4549                 cairo_font_options_set_hint_style
4550                     (im->font_options, CAIRO_HINT_STYLE_SLIGHT);
4551             } else if (strcmp(optarg, "mono") == 0) {
4552                 cairo_font_options_set_antialias
4553                     (im->font_options, CAIRO_ANTIALIAS_NONE);
4554                 cairo_font_options_set_hint_style
4555                     (im->font_options, CAIRO_HINT_STYLE_FULL);
4556             } else {
4557                 rrd_set_error("unknown font-render-mode '%s'", optarg);
4558                 return;
4559             }
4560             break;
4561         case 'G':
4562             if (strcmp(optarg, "normal") == 0)
4563                 im->graph_antialias = CAIRO_ANTIALIAS_GRAY;
4564             else if (strcmp(optarg, "mono") == 0)
4565                 im->graph_antialias = CAIRO_ANTIALIAS_NONE;
4566             else {
4567                 rrd_set_error("unknown graph-render-mode '%s'", optarg);
4568                 return;
4569             }
4570             break;
4571         case 'B':
4572             /* not supported curently */
4573             break;
4574         case 'W':
4575             strncpy(im->watermark, optarg, 100);
4576             im->watermark[99] = '\0';
4577             break;
4578         case 'd':
4579         {
4580             if (im->daemon_addr != NULL)
4581             {
4582                 rrd_set_error ("You cannot specify --daemon "
4583                         "more than once.");
4584                 return;
4585             }
4586
4587             im->daemon_addr = strdup(optarg);
4588             if (im->daemon_addr == NULL)
4589             {
4590               rrd_set_error("strdup failed");
4591               return;
4592             }
4593
4594             break;
4595         }
4596         case '?':
4597             if (optopt != 0)
4598                 rrd_set_error("unknown option '%c'", optopt);
4599             else
4600                 rrd_set_error("unknown option '%s'", argv[optind - 1]);
4601             return;
4602         }
4603     } /* while (1) */
4604
4605     {   /* try to connect to rrdcached */
4606         int status = rrdc_connect(im->daemon_addr);
4607         if (status != 0) return;
4608     }
4609
4610     pango_cairo_context_set_font_options(pango_layout_get_context(im->layout), im->font_options);
4611     pango_layout_context_changed(im->layout);
4612
4613
4614
4615     if (im->logarithmic && im->minval <= 0) {
4616         rrd_set_error
4617             ("for a logarithmic yaxis you must specify a lower-limit > 0");
4618         return;
4619     }
4620
4621     if (rrd_proc_start_end(&start_tv, &end_tv, &start_tmp, &end_tmp) == -1) {
4622         /* error string is set in rrd_parsetime.c */
4623         return;
4624     }
4625
4626     if (start_tmp < 3600 * 24 * 365 * 10) {
4627         rrd_set_error
4628             ("the first entry to fetch should be after 1980 (%ld)",
4629              start_tmp);
4630         return;
4631     }
4632
4633     if (end_tmp < start_tmp) {
4634         rrd_set_error
4635             ("start (%ld) should be less than end (%ld)", start_tmp, end_tmp);
4636         return;
4637     }
4638
4639     im->start = start_tmp;
4640     im->end = end_tmp;
4641     im->step = max((long) im->step, (im->end - im->start) / im->xsize);
4642 }
4643
4644 int rrd_graph_color(
4645     image_desc_t
4646     *im,
4647     char *var,
4648     char *err,
4649     int optional)
4650 {
4651     char     *color;
4652     graph_desc_t *gdp = &im->gdes[im->gdes_c - 1];
4653
4654     color = strstr(var, "#");
4655     if (color == NULL) {
4656         if (optional == 0) {
4657             rrd_set_error("Found no color in %s", err);
4658             return 0;
4659         }
4660         return 0;
4661     } else {
4662         int       n = 0;
4663         char     *rest;
4664         long unsigned int col;
4665
4666         rest = strstr(color, ":");
4667         if (rest != NULL)
4668             n = rest - color;
4669         else
4670             n = strlen(color);
4671         switch (n) {
4672         case 7:
4673             sscanf(color, "#%6lx%n", &col, &n);
4674             col = (col << 8) + 0xff /* shift left by 8 */ ;
4675             if (n != 7)
4676                 rrd_set_error("Color problem in %s", err);
4677             break;
4678         case 9:
4679             sscanf(color, "#%8lx%n", &col, &n);
4680             if (n == 9)
4681                 break;
4682         default:
4683             rrd_set_error("Color problem in %s", err);
4684         }
4685         if (rrd_test_error())
4686             return 0;
4687         gdp->col = gfx_hex_to_col(col);
4688         return n;
4689     }
4690 }
4691
4692
4693 int bad_format(
4694     char *fmt)
4695 {
4696     char     *ptr;
4697     int       n = 0;
4698
4699     ptr = fmt;
4700     while (*ptr != '\0')
4701         if (*ptr++ == '%') {
4702
4703             /* line cannot end with percent char */
4704             if (*ptr == '\0')
4705                 return 1;
4706             /* '%s', '%S' and '%%' are allowed */
4707             if (*ptr == 's' || *ptr == 'S' || *ptr == '%')
4708                 ptr++;
4709             /* %c is allowed (but use only with vdef!) */
4710             else if (*ptr == 'c') {
4711                 ptr++;
4712                 n = 1;
4713             }
4714
4715             /* or else '% 6.2lf' and such are allowed */
4716             else {
4717                 /* optional padding character */
4718                 if (*ptr == ' ' || *ptr == '+' || *ptr == '-')
4719                     ptr++;
4720                 /* This should take care of 'm.n' with all three optional */
4721                 while (*ptr >= '0' && *ptr <= '9')
4722                     ptr++;
4723                 if (*ptr == '.')
4724                     ptr++;
4725                 while (*ptr >= '0' && *ptr <= '9')
4726                     ptr++;
4727                 /* Either 'le', 'lf' or 'lg' must follow here */
4728                 if (*ptr++ != 'l')
4729                     return 1;
4730                 if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g')
4731                     ptr++;
4732                 else
4733                     return 1;
4734                 n++;
4735             }
4736         }
4737
4738     return (n != 1);
4739 }
4740
4741
4742 int vdef_parse(
4743     struct graph_desc_t
4744     *gdes,
4745     const char *const str)
4746 {
4747     /* A VDEF currently is either "func" or "param,func"
4748      * so the parsing is rather simple.  Change if needed.
4749      */
4750     double    param;
4751     char      func[30];
4752     int       n;
4753     char     *old_locale;
4754
4755     n = 0;
4756     old_locale = setlocale(LC_NUMERIC, "C");
4757     sscanf(str, "%le,%29[A-Z]%n", &param, func, &n);
4758     setlocale(LC_NUMERIC, old_locale);
4759     if (n == (int) strlen(str)) {   /* matched */
4760         ;
4761     } else {
4762         n = 0;
4763         sscanf(str, "%29[A-Z]%n", func, &n);
4764         if (n == (int) strlen(str)) {   /* matched */
4765             param = DNAN;
4766         } else {
4767             rrd_set_error
4768                 ("Unknown function string '%s' in VDEF '%s'",
4769                  str, gdes->vname);
4770             return -1;
4771         }
4772     }
4773     if (!strcmp("PERCENT", func))
4774         gdes->vf.op = VDEF_PERCENT;
4775     else if (!strcmp("PERCENTNAN", func))
4776         gdes->vf.op = VDEF_PERCENTNAN;
4777     else if (!strcmp("MAXIMUM", func))
4778         gdes->vf.op = VDEF_MAXIMUM;
4779     else if (!strcmp("AVERAGE", func))
4780         gdes->vf.op = VDEF_AVERAGE;
4781     else if (!strcmp("STDEV", func))
4782         gdes->vf.op = VDEF_STDEV;
4783     else if (!strcmp("MINIMUM", func))
4784         gdes->vf.op = VDEF_MINIMUM;
4785     else if (!strcmp("TOTAL", func))
4786         gdes->vf.op = VDEF_TOTAL;
4787     else if (!strcmp("FIRST", func))
4788         gdes->vf.op = VDEF_FIRST;
4789     else if (!strcmp("LAST", func))
4790         gdes->vf.op = VDEF_LAST;
4791     else if (!strcmp("LSLSLOPE", func))
4792         gdes->vf.op = VDEF_LSLSLOPE;
4793     else if (!strcmp("LSLINT", func))
4794         gdes->vf.op = VDEF_LSLINT;
4795     else if (!strcmp("LSLCORREL", func))
4796         gdes->vf.op = VDEF_LSLCORREL;
4797     else {
4798         rrd_set_error
4799             ("Unknown function '%s' in VDEF '%s'\n", func, gdes->vname);
4800         return -1;
4801     };
4802     switch (gdes->vf.op) {
4803     case VDEF_PERCENT:
4804     case VDEF_PERCENTNAN:
4805         if (isnan(param)) { /* no parameter given */
4806             rrd_set_error
4807                 ("Function '%s' needs parameter in VDEF '%s'\n",
4808                  func, gdes->vname);
4809             return -1;
4810         };
4811         if (param >= 0.0 && param <= 100.0) {
4812             gdes->vf.param = param;
4813             gdes->vf.val = DNAN;    /* undefined */
4814             gdes->vf.when = 0;  /* undefined */
4815         } else {
4816             rrd_set_error
4817                 ("Parameter '%f' out of range in VDEF '%s'\n",
4818                  param, gdes->vname);
4819             return -1;
4820         };
4821         break;
4822     case VDEF_MAXIMUM:
4823     case VDEF_AVERAGE:
4824     case VDEF_STDEV:
4825     case VDEF_MINIMUM:
4826     case VDEF_TOTAL:
4827     case VDEF_FIRST:
4828     case VDEF_LAST:
4829     case VDEF_LSLSLOPE:
4830     case VDEF_LSLINT:
4831     case VDEF_LSLCORREL:
4832         if (isnan(param)) {
4833             gdes->vf.param = DNAN;
4834             gdes->vf.val = DNAN;
4835             gdes->vf.when = 0;
4836         } else {
4837             rrd_set_error
4838                 ("Function '%s' needs no parameter in VDEF '%s'\n",
4839                  func, gdes->vname);
4840             return -1;
4841         };
4842         break;
4843     };
4844     return 0;
4845 }
4846
4847
4848 int vdef_calc(
4849     image_desc_t *im,
4850     int gdi)
4851 {
4852     graph_desc_t *src, *dst;
4853     rrd_value_t *data;
4854     long      step, steps;
4855
4856     dst = &im->gdes[gdi];
4857     src = &im->gdes[dst->vidx];
4858     data = src->data + src->ds;
4859
4860     steps = (src->end - src->start) / src->step;
4861 #if 0
4862     printf
4863         ("DEBUG: start == %lu, end == %lu, %lu steps\n",
4864          src->start, src->end, steps);
4865 #endif
4866     switch (dst->vf.op) {
4867     case VDEF_PERCENT:{
4868         rrd_value_t *array;
4869         int       field;
4870         if ((array = (rrd_value_t*)malloc(steps * sizeof(double))) == NULL) {
4871             rrd_set_error("malloc VDEV_PERCENT");
4872             return -1;
4873         }
4874         for (step = 0; step < steps; step++) {
4875             array[step] = data[step * src->ds_cnt];
4876         }
4877         qsort(array, step, sizeof(double), vdef_percent_compar);
4878         field = round((dst->vf.param * (double)(steps - 1)) / 100.0);
4879         dst->vf.val = array[field];
4880         dst->vf.when = 0;   /* no time component */
4881         free(array);
4882 #if 0
4883         for (step = 0; step < steps; step++)
4884             printf("DEBUG: %3li:%10.2f %c\n",
4885                    step, array[step], step == field ? '*' : ' ');
4886 #endif
4887     }
4888         break;
4889     case VDEF_PERCENTNAN:{
4890         rrd_value_t *array;
4891         int       field;
4892        /* count number of "valid" values */
4893        int nancount=0;
4894        for (step = 0; step < steps; step++) {
4895          if (!isnan(data[step * src->ds_cnt])) { nancount++; }
4896        }
4897        /* and allocate it */
4898         if ((array = (rrd_value_t*)malloc(nancount * sizeof(double))) == NULL) {
4899             rrd_set_error("malloc VDEV_PERCENT");
4900             return -1;
4901         }
4902        /* and fill it in */
4903        field=0;
4904         for (step = 0; step < steps; step++) {
4905            if (!isnan(data[step * src->ds_cnt])) {
4906                 array[field] = data[step * src->ds_cnt];
4907                field++;
4908             }
4909         }
4910         qsort(array, nancount, sizeof(double), vdef_percent_compar);
4911         field = round( dst->vf.param * (double)(nancount - 1) / 100.0);
4912         dst->vf.val = array[field];
4913         dst->vf.when = 0;   /* no time component */
4914         free(array);
4915     }
4916         break;
4917     case VDEF_MAXIMUM:
4918         step = 0;
4919         while (step != steps && isnan(data[step * src->ds_cnt]))
4920             step++;
4921         if (step == steps) {
4922             dst->vf.val = DNAN;
4923             dst->vf.when = 0;
4924         } else {
4925             dst->vf.val = data[step * src->ds_cnt];
4926             dst->vf.when = src->start + (step + 1) * src->step;
4927         }
4928         while (step != steps) {
4929             if (finite(data[step * src->ds_cnt])) {
4930                 if (data[step * src->ds_cnt] > dst->vf.val) {
4931                     dst->vf.val = data[step * src->ds_cnt];
4932                     dst->vf.when = src->start + (step + 1) * src->step;
4933                 }
4934             }
4935             step++;
4936         }
4937         break;
4938     case VDEF_TOTAL:
4939     case VDEF_STDEV:
4940     case VDEF_AVERAGE:{
4941         int       cnt = 0;
4942         double    sum = 0.0;
4943         double    average = 0.0;
4944
4945         for (step = 0; step < steps; step++) {
4946             if (finite(data[step * src->ds_cnt])) {
4947                 sum += data[step * src->ds_cnt];
4948                 cnt++;
4949             };
4950         }
4951         if (cnt) {
4952             if (dst->vf.op == VDEF_TOTAL) {
4953                 dst->vf.val = sum * src->step;
4954                 dst->vf.when = 0;   /* no time component */
4955             } else if (dst->vf.op == VDEF_AVERAGE) {
4956                 dst->vf.val = sum / cnt;
4957                 dst->vf.when = 0;   /* no time component */
4958             } else {
4959                 average = sum / cnt;
4960                 sum = 0.0;
4961                 for (step = 0; step < steps; step++) {
4962                     if (finite(data[step * src->ds_cnt])) {
4963                         sum += pow((data[step * src->ds_cnt] - average), 2.0);
4964                     };
4965                 }
4966                 dst->vf.val = pow(sum / cnt, 0.5);
4967                 dst->vf.when = 0;   /* no time component */
4968             };
4969         } else {
4970             dst->vf.val = DNAN;
4971             dst->vf.when = 0;
4972         }
4973     }
4974         break;
4975     case VDEF_MINIMUM:
4976         step = 0;
4977         while (step != steps && isnan(data[step * src->ds_cnt]))
4978             step++;
4979         if (step == steps) {
4980             dst->vf.val = DNAN;
4981             dst->vf.when = 0;
4982         } else {
4983             dst->vf.val = data[step * src->ds_cnt];
4984             dst->vf.when = src->start + (step + 1) * src->step;
4985         }
4986         while (step != steps) {
4987             if (finite(data[step * src->ds_cnt])) {
4988                 if (data[step * src->ds_cnt] < dst->vf.val) {
4989                     dst->vf.val = data[step * src->ds_cnt];
4990                     dst->vf.when = src->start + (step + 1) * src->step;
4991                 }
4992             }
4993             step++;
4994         }
4995         break;
4996     case VDEF_FIRST:
4997         /* The time value returned here is one step before the
4998          * actual time value.  This is the start of the first
4999          * non-NaN interval.
5000          */
5001         step = 0;
5002         while (step != steps && isnan(data[step * src->ds_cnt]))
5003             step++;
5004         if (step == steps) {    /* all entries were NaN */
5005             dst->vf.val = DNAN;
5006             dst->vf.when = 0;
5007         } else {
5008             dst->vf.val = data[step * src->ds_cnt];
5009             dst->vf.when = src->start + step * src->step;
5010         }
5011         break;
5012     case VDEF_LAST:
5013         /* The time value returned here is the
5014          * actual time value.  This is the end of the last
5015          * non-NaN interval.
5016          */
5017         step = steps - 1;
5018         while (step >= 0 && isnan(data[step * src->ds_cnt]))
5019             step--;
5020         if (step < 0) { /* 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 + 1) * src->step;
5026         }
5027         break;
5028     case VDEF_LSLSLOPE:
5029     case VDEF_LSLINT:
5030     case VDEF_LSLCORREL:{
5031         /* Bestfit line by linear least squares method */
5032
5033         int       cnt = 0;
5034         double    SUMx, SUMy, SUMxy, SUMxx, SUMyy, slope, y_intercept, correl;
5035
5036         SUMx = 0;
5037         SUMy = 0;
5038         SUMxy = 0;
5039         SUMxx = 0;
5040         SUMyy = 0;
5041         for (step = 0; step < steps; step++) {
5042             if (finite(data[step * src->ds_cnt])) {
5043                 cnt++;
5044                 SUMx += step;
5045                 SUMxx += step * step;
5046                 SUMxy += step * data[step * src->ds_cnt];
5047                 SUMy += data[step * src->ds_cnt];
5048                 SUMyy += data[step * src->ds_cnt] * data[step * src->ds_cnt];
5049             };
5050         }
5051
5052         slope = (SUMx * SUMy - cnt * SUMxy) / (SUMx * SUMx - cnt * SUMxx);
5053         y_intercept = (SUMy - slope * SUMx) / cnt;
5054         correl =
5055             (SUMxy -
5056              (SUMx * SUMy) / cnt) /
5057             sqrt((SUMxx -
5058                   (SUMx * SUMx) / cnt) * (SUMyy - (SUMy * SUMy) / cnt));
5059         if (cnt) {
5060             if (dst->vf.op == VDEF_LSLSLOPE) {
5061                 dst->vf.val = slope;
5062                 dst->vf.when = 0;
5063             } else if (dst->vf.op == VDEF_LSLINT) {
5064                 dst->vf.val = y_intercept;
5065                 dst->vf.when = 0;
5066             } else if (dst->vf.op == VDEF_LSLCORREL) {
5067                 dst->vf.val = correl;
5068                 dst->vf.when = 0;
5069             };
5070         } else {
5071             dst->vf.val = DNAN;
5072             dst->vf.when = 0;
5073         }
5074     }
5075         break;
5076     }
5077     return 0;
5078 }
5079
5080 /* NaN < -INF < finite_values < INF */
5081 int vdef_percent_compar(
5082     const void
5083     *a,
5084     const void
5085     *b)
5086 {
5087     /* Equality is not returned; this doesn't hurt except
5088      * (maybe) for a little performance.
5089      */
5090
5091     /* First catch NaN values. They are smallest */
5092     if (isnan(*(double *) a))
5093         return -1;
5094     if (isnan(*(double *) b))
5095         return 1;
5096     /* NaN doesn't reach this part so INF and -INF are extremes.
5097      * The sign from isinf() is compatible with the sign we return
5098      */
5099     if (isinf(*(double *) a))
5100         return isinf(*(double *) a);
5101     if (isinf(*(double *) b))
5102         return isinf(*(double *) b);
5103     /* If we reach this, both values must be finite */
5104     if (*(double *) a < *(double *) b)
5105         return -1;
5106     else
5107         return 1;
5108 }
5109
5110 void grinfo_push(
5111     image_desc_t *im,
5112     char *key,
5113     rrd_info_type_t type,
5114     rrd_infoval_t value)
5115 {
5116     im->grinfo_current = rrd_info_push(im->grinfo_current, key, type, value);
5117     if (im->grinfo == NULL) {
5118         im->grinfo = im->grinfo_current;
5119     }
5120 }