src/rrd_graph.c

   1 /****************************************************************************
   2  * RRDtool 1.3.1  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 #include "rrd_tool.h"
  14
  15 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
  16 #include <io.h>
  17 #include <fcntl.h>
  18 #endif
  19
  20 #ifdef HAVE_TIME_H
  21 #include <time.h>
  22 #endif
  23
  24 #ifdef HAVE_LOCALE_H
  25 #include <locale.h>
  26 #endif
  27
  28 #include "rrd_graph.h"
  29
  30 /* some constant definitions */
  31
  32
  33
  34 #ifndef RRD_DEFAULT_FONT
  35 /* there is special code later to pick Cour.ttf when running on windows */
  36 #define RRD_DEFAULT_FONT "DejaVu Sans Mono,Bitstream Vera Sans Mono,monospace,Courier"
  37 #endif
  38
  39 text_prop_t text_prop[] = {
  40     {8.0, RRD_DEFAULT_FONT}
  41     ,                   /* default */
  42     {9.0, RRD_DEFAULT_FONT}
  43     ,                   /* title */
  44     {7.0, RRD_DEFAULT_FONT}
  45     ,                   /* axis */
  46     {8.0, RRD_DEFAULT_FONT}
  47     ,                   /* unit */
  48     {8.0, RRD_DEFAULT_FONT} /* legend */
  49 };
  50
  51 xlab_t    xlab[] = {
  52     {0, 0, TMT_SECOND, 30, TMT_MINUTE, 5, TMT_MINUTE, 5, 0, "%H:%M"}
  53     ,
  54     {2, 0, TMT_MINUTE, 1, TMT_MINUTE, 5, TMT_MINUTE, 5, 0, "%H:%M"}
  55     ,
  56     {5, 0, TMT_MINUTE, 2, TMT_MINUTE, 10, TMT_MINUTE, 10, 0, "%H:%M"}
  57     ,
  58     {10, 0, TMT_MINUTE, 5, TMT_MINUTE, 20, TMT_MINUTE, 20, 0, "%H:%M"}
  59     ,
  60     {30, 0, TMT_MINUTE, 10, TMT_HOUR, 1, TMT_HOUR, 1, 0, "%H:%M"}
  61     ,
  62     {60, 0, TMT_MINUTE, 30, TMT_HOUR, 2, TMT_HOUR, 2, 0, "%H:%M"}
  63     ,
  64     {60, 24 * 3600, TMT_MINUTE, 30, TMT_HOUR, 2, TMT_HOUR, 6, 0, "%a %H:%M"}
  65     ,
  66     {180, 0, TMT_HOUR, 1, TMT_HOUR, 6, TMT_HOUR, 6, 0, "%H:%M"}
  67     ,
  68     {180, 24 * 3600, TMT_HOUR, 1, TMT_HOUR, 6, TMT_HOUR, 12, 0, "%a %H:%M"}
  69     ,
  70     /*{300,             0,   TMT_HOUR,3,    TMT_HOUR,12,   TMT_HOUR,12,    12*3600,"%a %p"},  this looks silly */
  71     {600, 0, TMT_HOUR, 6, TMT_DAY, 1, TMT_DAY, 1, 24 * 3600, "%a"}
  72     ,
  73     {1200, 0, TMT_HOUR, 6, TMT_DAY, 1, TMT_DAY, 1, 24 * 3600, "%d"}
  74     ,
  75     {1800, 0, TMT_HOUR, 12, TMT_DAY, 1, TMT_DAY, 2, 24 * 3600, "%a %d"}
  76     ,
  77     {2400, 0, TMT_HOUR, 12, TMT_DAY, 1, TMT_DAY, 2, 24 * 3600, "%a"}
  78     ,
  79     {3600, 0, TMT_DAY, 1, TMT_WEEK, 1, TMT_WEEK, 1, 7 * 24 * 3600, "Week %V"}
  80     ,
  81     {3 * 3600, 0, TMT_WEEK, 1, TMT_MONTH, 1, TMT_WEEK, 2, 7 * 24 * 3600,
  82      "Week %V"}
  83     ,
  84     {6 * 3600, 0, TMT_MONTH, 1, TMT_MONTH, 1, TMT_MONTH, 1, 30 * 24 * 3600,
  85      "%b"}
  86     ,
  87     {48 * 3600, 0, TMT_MONTH, 1, TMT_MONTH, 3, TMT_MONTH, 3, 30 * 24 * 3600,
  88      "%b"}
  89     ,
  90     {315360, 0, TMT_MONTH, 3, TMT_YEAR, 1, TMT_YEAR, 1, 365 * 24 * 3600, "%Y"}
  91     ,
  92     {10 * 24 * 3600, 0, TMT_YEAR, 1, TMT_YEAR, 1, TMT_YEAR, 1,
  93      365 * 24 * 3600, "%y"}
  94     ,
  95     {-1, 0, TMT_MONTH, 0, TMT_MONTH, 0, TMT_MONTH, 0, 0, ""}
  96 };
  97
  98 /* sensible y label intervals ...*/
  99
 100 ylab_t    ylab[] = {
 101     {0.1, {1, 2, 5, 10}
 102      }
 103     ,
 104     {0.2, {1, 5, 10, 20}
 105      }
 106     ,
 107     {0.5, {1, 2, 4, 10}
 108      }
 109     ,
 110     {1.0, {1, 2, 5, 10}
 111      }
 112     ,
 113     {2.0, {1, 5, 10, 20}
 114      }
 115     ,
 116     {5.0, {1, 2, 4, 10}
 117      }
 118     ,
 119     {10.0, {1, 2, 5, 10}
 120      }
 121     ,
 122     {20.0, {1, 5, 10, 20}
 123      }
 124     ,
 125     {50.0, {1, 2, 4, 10}
 126      }
 127     ,
 128     {100.0, {1, 2, 5, 10}
 129      }
 130     ,
 131     {200.0, {1, 5, 10, 20}
 132      }
 133     ,
 134     {500.0, {1, 2, 4, 10}
 135      }
 136     ,
 137     {0.0, {0, 0, 0, 0}
 138      }
 139 };
 140
 141
 142 gfx_color_t graph_col[] =   /* default colors */
 143 {
 144     {1.00, 1.00, 1.00, 1.00},   /* canvas     */
 145     {0.95, 0.95, 0.95, 1.00},   /* background */
 146     {0.81, 0.81, 0.81, 1.00},   /* shade A    */
 147     {0.62, 0.62, 0.62, 1.00},   /* shade B    */
 148     {0.56, 0.56, 0.56, 0.75},   /* grid       */
 149     {0.87, 0.31, 0.31, 0.60},   /* major grid */
 150     {0.00, 0.00, 0.00, 1.00},   /* font       */
 151     {0.50, 0.12, 0.12, 1.00},   /* arrow      */
 152     {0.12, 0.12, 0.12, 1.00},   /* axis       */
 153     {0.00, 0.00, 0.00, 1.00}    /* frame      */
 154 };
 155
 156
 157 /* #define DEBUG */
 158
 159 #ifdef DEBUG
 160 # define DPRINT(x)    (void)(printf x, printf("\n"))
 161 #else
 162 # define DPRINT(x)
 163 #endif
 164
 165
 166 /* initialize with xtr(im,0); */
 167 int xtr(
 168     image_desc_t *im,
 169     time_t mytime)
 170 {
 171     static double pixie;
 172
 173     if (mytime == 0) {
 174         pixie = (double) im->xsize / (double) (im->end - im->start);
 175         return im->xorigin;
 176     }
 177     return (int) ((double) im->xorigin + pixie * (mytime - im->start));
 178 }
 179
 180 /* translate data values into y coordinates */
 181 double ytr(
 182     image_desc_t *im,
 183     double value)
 184 {
 185     static double pixie;
 186     double    yval;
 187
 188     if (isnan(value)) {
 189         if (!im->logarithmic)
 190             pixie = (double) im->ysize / (im->maxval - im->minval);
 191         else
 192             pixie =
 193                 (double) im->ysize / (log10(im->maxval) - log10(im->minval));
 194         yval = im->yorigin;
 195     } else if (!im->logarithmic) {
 196         yval = im->yorigin - pixie * (value - im->minval);
 197     } else {
 198         if (value < im->minval) {
 199             yval = im->yorigin;
 200         } else {
 201             yval = im->yorigin - pixie * (log10(value) - log10(im->minval));
 202         }
 203     }
 204     return yval;
 205 }
 206
 207
 208
 209 /* conversion function for symbolic entry names */
 210
 211
 212 #define conv_if(VV,VVV) \
 213    if (strcmp(#VV, string) == 0) return VVV ;
 214
 215 enum gf_en gf_conv(
 216     char *string)
 217 {
 218
 219     conv_if(PRINT, GF_PRINT);
 220     conv_if(GPRINT, GF_GPRINT);
 221     conv_if(COMMENT, GF_COMMENT);
 222     conv_if(HRULE, GF_HRULE);
 223     conv_if(VRULE, GF_VRULE);
 224     conv_if(LINE, GF_LINE);
 225     conv_if(AREA, GF_AREA);
 226     conv_if(STACK, GF_STACK);
 227     conv_if(TICK, GF_TICK);
 228     conv_if(TEXTALIGN, GF_TEXTALIGN);
 229     conv_if(DEF, GF_DEF);
 230     conv_if(CDEF, GF_CDEF);
 231     conv_if(VDEF, GF_VDEF);
 232     conv_if(XPORT, GF_XPORT);
 233     conv_if(SHIFT, GF_SHIFT);
 234
 235     return (-1);
 236 }
 237
 238 enum gfx_if_en if_conv(
 239     char *string)
 240 {
 241
 242     conv_if(PNG, IF_PNG);
 243     conv_if(SVG, IF_SVG);
 244     conv_if(EPS, IF_EPS);
 245     conv_if(PDF, IF_PDF);
 246
 247     return (-1);
 248 }
 249
 250 enum tmt_en tmt_conv(
 251     char *string)
 252 {
 253
 254     conv_if(SECOND, TMT_SECOND);
 255     conv_if(MINUTE, TMT_MINUTE);
 256     conv_if(HOUR, TMT_HOUR);
 257     conv_if(DAY, TMT_DAY);
 258     conv_if(WEEK, TMT_WEEK);
 259     conv_if(MONTH, TMT_MONTH);
 260     conv_if(YEAR, TMT_YEAR);
 261     return (-1);
 262 }
 263
 264 enum grc_en grc_conv(
 265     char *string)
 266 {
 267
 268     conv_if(BACK, GRC_BACK);
 269     conv_if(CANVAS, GRC_CANVAS);
 270     conv_if(SHADEA, GRC_SHADEA);
 271     conv_if(SHADEB, GRC_SHADEB);
 272     conv_if(GRID, GRC_GRID);
 273     conv_if(MGRID, GRC_MGRID);
 274     conv_if(FONT, GRC_FONT);
 275     conv_if(ARROW, GRC_ARROW);
 276     conv_if(AXIS, GRC_AXIS);
 277     conv_if(FRAME, GRC_FRAME);
 278
 279     return -1;
 280 }
 281
 282 enum text_prop_en text_prop_conv(
 283     char *string)
 284 {
 285
 286     conv_if(DEFAULT, TEXT_PROP_DEFAULT);
 287     conv_if(TITLE, TEXT_PROP_TITLE);
 288     conv_if(AXIS, TEXT_PROP_AXIS);
 289     conv_if(UNIT, TEXT_PROP_UNIT);
 290     conv_if(LEGEND, TEXT_PROP_LEGEND);
 291     return -1;
 292 }
 293
 294
 295 #undef conv_if
 296
 297 int im_free(
 298     image_desc_t *im)
 299 {
 300     unsigned long i, ii;
 301     cairo_status_t status = 0;
 302
 303     if (im == NULL)
 304         return 0;
 305     for (i = 0; i < (unsigned) im->gdes_c; i++) {
 306         if (im->gdes[i].data_first) {
 307             /* careful here, because a single pointer can occur several times */
 308             free(im->gdes[i].data);
 309             if (im->gdes[i].ds_namv) {
 310                 for (ii = 0; ii < im->gdes[i].ds_cnt; ii++)
 311                     free(im->gdes[i].ds_namv[ii]);
 312                 free(im->gdes[i].ds_namv);
 313             }
 314         }
 315         /* free allocated memory used for dashed lines */
 316         if (im->gdes[i].p_dashes != NULL)
 317             free(im->gdes[i].p_dashes);
 318
 319         free(im->gdes[i].p_data);
 320         free(im->gdes[i].rpnp);
 321     }
 322     free(im->gdes);
 323     if (im->font_options)
 324         cairo_font_options_destroy(im->font_options);
 325
 326     if (im->cr) {
 327         status = cairo_status(im->cr);
 328         cairo_destroy(im->cr);
 329     }
 330     if (im->rendered_image) {
 331         free(im->rendered_image);
 332     }
 333     if (im->surface)
 334         cairo_surface_destroy(im->surface);
 335     if (status)
 336         fprintf(stderr, "OOPS: Cairo has issues it can't even die: %s\n",
 337                 cairo_status_to_string(status));
 338
 339     return 0;
 340 }
 341
 342 /* find SI magnitude symbol for the given number*/
 343 void auto_scale(
 344     image_desc_t *im,   /* image description */
 345     double *value,
 346     char **symb_ptr,
 347     double *magfact)
 348 {
 349
 350     char     *symbol[] = { "a", /* 10e-18 Atto */
 351         "f",            /* 10e-15 Femto */
 352         "p",            /* 10e-12 Pico */
 353         "n",            /* 10e-9  Nano */
 354         "u",            /* 10e-6  Micro */
 355         "m",            /* 10e-3  Milli */
 356         " ",            /* Base */
 357         "k",            /* 10e3   Kilo */
 358         "M",            /* 10e6   Mega */
 359         "G",            /* 10e9   Giga */
 360         "T",            /* 10e12  Tera */
 361         "P",            /* 10e15  Peta */
 362         "E"
 363     };                  /* 10e18  Exa */
 364
 365     int       symbcenter = 6;
 366     int       sindex;
 367
 368     if (*value == 0.0 || isnan(*value)) {
 369         sindex = 0;
 370         *magfact = 1.0;
 371     } else {
 372         sindex = floor(log(fabs(*value)) / log((double) im->base));
 373         *magfact = pow((double) im->base, (double) sindex);
 374         (*value) /= (*magfact);
 375     }
 376     if (sindex <= symbcenter && sindex >= -symbcenter) {
 377         (*symb_ptr) = symbol[sindex + symbcenter];
 378     } else {
 379         (*symb_ptr) = "?";
 380     }
 381 }
 382
 383
 384 static char si_symbol[] = {
 385     'a',                /* 10e-18 Atto */
 386     'f',                /* 10e-15 Femto */
 387     'p',                /* 10e-12 Pico */
 388     'n',                /* 10e-9  Nano */
 389     'u',                /* 10e-6  Micro */
 390     'm',                /* 10e-3  Milli */
 391     ' ',                /* Base */
 392     'k',                /* 10e3   Kilo */
 393     'M',                /* 10e6   Mega */
 394     'G',                /* 10e9   Giga */
 395     'T',                /* 10e12  Tera */
 396     'P',                /* 10e15  Peta */
 397     'E',                /* 10e18  Exa */
 398 };
 399 static const int si_symbcenter = 6;
 400
 401 /* find SI magnitude symbol for the numbers on the y-axis*/
 402 void si_unit(
 403     image_desc_t *im    /* image description */
 404     )
 405 {
 406
 407     double    digits, viewdigits = 0;
 408
 409     digits =
 410         floor(log(max(fabs(im->minval), fabs(im->maxval))) /
 411               log((double) im->base));
 412
 413     if (im->unitsexponent != 9999) {
 414         /* unitsexponent = 9, 6, 3, 0, -3, -6, -9, etc */
 415         viewdigits = floor(im->unitsexponent / 3);
 416     } else {
 417         viewdigits = digits;
 418     }
 419
 420     im->magfact = pow((double) im->base, digits);
 421
 422 #ifdef DEBUG
 423     printf("digits %6.3f  im->magfact %6.3f\n", digits, im->magfact);
 424 #endif
 425
 426     im->viewfactor = im->magfact / pow((double) im->base, viewdigits);
 427
 428     if (((viewdigits + si_symbcenter) < sizeof(si_symbol)) &&
 429         ((viewdigits + si_symbcenter) >= 0))
 430         im->symbol = si_symbol[(int) viewdigits + si_symbcenter];
 431     else
 432         im->symbol = '?';
 433 }
 434
 435 /*  move min and max values around to become sensible */
 436
 437 void expand_range(
 438     image_desc_t *im)
 439 {
 440     double    sensiblevalues[] = { 1000.0, 900.0, 800.0, 750.0, 700.0,
 441         600.0, 500.0, 400.0, 300.0, 250.0,
 442         200.0, 125.0, 100.0, 90.0, 80.0,
 443         75.0, 70.0, 60.0, 50.0, 40.0, 30.0,
 444         25.0, 20.0, 10.0, 9.0, 8.0,
 445         7.0, 6.0, 5.0, 4.0, 3.5, 3.0,
 446         2.5, 2.0, 1.8, 1.5, 1.2, 1.0,
 447         0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.0, -1
 448     };
 449
 450     double    scaled_min, scaled_max;
 451     double    adj;
 452     int       i;
 453
 454
 455
 456 #ifdef DEBUG
 457     printf("Min: %6.2f Max: %6.2f MagFactor: %6.2f\n",
 458            im->minval, im->maxval, im->magfact);
 459 #endif
 460
 461     if (isnan(im->ygridstep)) {
 462         if (im->extra_flags & ALTAUTOSCALE) {
 463             /* measure the amplitude of the function. Make sure that
 464                graph boundaries are slightly higher then max/min vals
 465                so we can see amplitude on the graph */
 466             double    delt, fact;
 467
 468             delt = im->maxval - im->minval;
 469             adj = delt * 0.1;
 470             fact = 2.0 * pow(10.0,
 471                              floor(log10
 472                                    (max(fabs(im->minval), fabs(im->maxval)) /
 473                                     im->magfact)) - 2);
 474             if (delt < fact) {
 475                 adj = (fact - delt) * 0.55;
 476 #ifdef DEBUG
 477                 printf
 478                     ("Min: %6.2f Max: %6.2f delt: %6.2f fact: %6.2f adj: %6.2f\n",
 479                      im->minval, im->maxval, delt, fact, adj);
 480 #endif
 481             }
 482             im->minval -= adj;
 483             im->maxval += adj;
 484         } else if (im->extra_flags & ALTAUTOSCALE_MIN) {
 485             /* measure the amplitude of the function. Make sure that
 486                graph boundaries are slightly lower than min vals
 487                so we can see amplitude on the graph */
 488             adj = (im->maxval - im->minval) * 0.1;
 489             im->minval -= adj;
 490         } else if (im->extra_flags & ALTAUTOSCALE_MAX) {
 491             /* measure the amplitude of the function. Make sure that
 492                graph boundaries are slightly higher than max vals
 493                so we can see amplitude on the graph */
 494             adj = (im->maxval - im->minval) * 0.1;
 495             im->maxval += adj;
 496         } else {
 497             scaled_min = im->minval / im->magfact;
 498             scaled_max = im->maxval / im->magfact;
 499
 500             for (i = 1; sensiblevalues[i] > 0; i++) {
 501                 if (sensiblevalues[i - 1] >= scaled_min &&
 502                     sensiblevalues[i] <= scaled_min)
 503                     im->minval = sensiblevalues[i] * (im->magfact);
 504
 505                 if (-sensiblevalues[i - 1] <= scaled_min &&
 506                     -sensiblevalues[i] >= scaled_min)
 507                     im->minval = -sensiblevalues[i - 1] * (im->magfact);
 508
 509                 if (sensiblevalues[i - 1] >= scaled_max &&
 510                     sensiblevalues[i] <= scaled_max)
 511                     im->maxval = sensiblevalues[i - 1] * (im->magfact);
 512
 513                 if (-sensiblevalues[i - 1] <= scaled_max &&
 514                     -sensiblevalues[i] >= scaled_max)
 515                     im->maxval = -sensiblevalues[i] * (im->magfact);
 516             }
 517         }
 518     } else {
 519         /* adjust min and max to the grid definition if there is one */
 520         im->minval = (double) im->ylabfact * im->ygridstep *
 521             floor(im->minval / ((double) im->ylabfact * im->ygridstep));
 522         im->maxval = (double) im->ylabfact * im->ygridstep *
 523             ceil(im->maxval / ((double) im->ylabfact * im->ygridstep));
 524     }
 525
 526 #ifdef DEBUG
 527     fprintf(stderr, "SCALED Min: %6.2f Max: %6.2f Factor: %6.2f\n",
 528             im->minval, im->maxval, im->magfact);
 529 #endif
 530 }
 531
 532
 533 void apply_gridfit(
 534     image_desc_t *im)
 535 {
 536     if (isnan(im->minval) || isnan(im->maxval))
 537         return;
 538     ytr(im, DNAN);
 539     if (im->logarithmic) {
 540         double    ya, yb, ypix, ypixfrac;
 541         double    log10_range = log10(im->maxval) - log10(im->minval);
 542
 543         ya = pow((double) 10, floor(log10(im->minval)));
 544         while (ya < im->minval)
 545             ya *= 10;
 546         if (ya > im->maxval)
 547             return;     /* don't have y=10^x gridline */
 548         yb = ya * 10;
 549         if (yb <= im->maxval) {
 550             /* we have at least 2 y=10^x gridlines.
 551                Make sure distance between them in pixels
 552                are an integer by expanding im->maxval */
 553             double    y_pixel_delta = ytr(im, ya) - ytr(im, yb);
 554             double    factor = y_pixel_delta / floor(y_pixel_delta);
 555             double    new_log10_range = factor * log10_range;
 556             double    new_ymax_log10 = log10(im->minval) + new_log10_range;
 557
 558             im->maxval = pow(10, new_ymax_log10);
 559             ytr(im, DNAN);  /* reset precalc */
 560             log10_range = log10(im->maxval) - log10(im->minval);
 561         }
 562         /* make sure first y=10^x gridline is located on
 563            integer pixel position by moving scale slightly
 564            downwards (sub-pixel movement) */
 565         ypix = ytr(im, ya) + im->ysize; /* add im->ysize so it always is positive */
 566         ypixfrac = ypix - floor(ypix);
 567         if (ypixfrac > 0 && ypixfrac < 1) {
 568             double    yfrac = ypixfrac / im->ysize;
 569
 570             im->minval = pow(10, log10(im->minval) - yfrac * log10_range);
 571             im->maxval = pow(10, log10(im->maxval) - yfrac * log10_range);
 572             ytr(im, DNAN);  /* reset precalc */
 573         }
 574     } else {
 575         /* Make sure we have an integer pixel distance between
 576            each minor gridline */
 577         double    ypos1 = ytr(im, im->minval);
 578         double    ypos2 = ytr(im, im->minval + im->ygrid_scale.gridstep);
 579         double    y_pixel_delta = ypos1 - ypos2;
 580         double    factor = y_pixel_delta / floor(y_pixel_delta);
 581         double    new_range = factor * (im->maxval - im->minval);
 582         double    gridstep = im->ygrid_scale.gridstep;
 583         double    minor_y, minor_y_px, minor_y_px_frac;
 584
 585         if (im->maxval > 0.0)
 586             im->maxval = im->minval + new_range;
 587         else
 588             im->minval = im->maxval - new_range;
 589         ytr(im, DNAN);  /* reset precalc */
 590         /* make sure first minor gridline is on integer pixel y coord */
 591         minor_y = gridstep * floor(im->minval / gridstep);
 592         while (minor_y < im->minval)
 593             minor_y += gridstep;
 594         minor_y_px = ytr(im, minor_y) + im->ysize;  /* ensure > 0 by adding ysize */
 595         minor_y_px_frac = minor_y_px - floor(minor_y_px);
 596         if (minor_y_px_frac > 0 && minor_y_px_frac < 1) {
 597             double    yfrac = minor_y_px_frac / im->ysize;
 598             double    range = im->maxval - im->minval;
 599
 600             im->minval = im->minval - yfrac * range;
 601             im->maxval = im->maxval - yfrac * range;
 602             ytr(im, DNAN);  /* reset precalc */
 603         }
 604         calc_horizontal_grid(im);   /* recalc with changed im->maxval */
 605     }
 606 }
 607
 608 /* reduce data reimplementation by Alex */
 609
 610 void reduce_data(
 611     enum cf_en cf,      /* which consolidation function ? */
 612     unsigned long cur_step, /* step the data currently is in */
 613     time_t *start,      /* start, end and step as requested ... */
 614     time_t *end,        /* ... by the application will be   ... */
 615     unsigned long *step,    /* ... adjusted to represent reality    */
 616     unsigned long *ds_cnt,  /* number of data sources in file */
 617     rrd_value_t **data)
 618 {                       /* two dimensional array containing the data */
 619     int       i, reduce_factor = ceil((double) (*step) / (double) cur_step);
 620     unsigned long col, dst_row, row_cnt, start_offset, end_offset, skiprows =
 621         0;
 622     rrd_value_t *srcptr, *dstptr;
 623
 624     (*step) = cur_step * reduce_factor; /* set new step size for reduced data */
 625     dstptr = *data;
 626     srcptr = *data;
 627     row_cnt = ((*end) - (*start)) / cur_step;
 628
 629 #ifdef DEBUG
 630 #define DEBUG_REDUCE
 631 #endif
 632 #ifdef DEBUG_REDUCE
 633     printf("Reducing %lu rows with factor %i time %lu to %lu, step %lu\n",
 634            row_cnt, reduce_factor, *start, *end, cur_step);
 635     for (col = 0; col < row_cnt; col++) {
 636         printf("time %10lu: ", *start + (col + 1) * cur_step);
 637         for (i = 0; i < *ds_cnt; i++)
 638             printf(" %8.2e", srcptr[*ds_cnt * col + i]);
 639         printf("\n");
 640     }
 641 #endif
 642
 643     /* We have to combine [reduce_factor] rows of the source
 644      ** into one row for the destination.  Doing this we also
 645      ** need to take care to combine the correct rows.  First
 646      ** alter the start and end time so that they are multiples
 647      ** of the new step time.  We cannot reduce the amount of
 648      ** time so we have to move the end towards the future and
 649      ** the start towards the past.
 650      */
 651     end_offset = (*end) % (*step);
 652     start_offset = (*start) % (*step);
 653
 654     /* If there is a start offset (which cannot be more than
 655      ** one destination row), skip the appropriate number of
 656      ** source rows and one destination row.  The appropriate
 657      ** number is what we do know (start_offset/cur_step) of
 658      ** the new interval (*step/cur_step aka reduce_factor).
 659      */
 660 #ifdef DEBUG_REDUCE
 661     printf("start_offset: %lu  end_offset: %lu\n", start_offset, end_offset);
 662     printf("row_cnt before:  %lu\n", row_cnt);
 663 #endif
 664     if (start_offset) {
 665         (*start) = (*start) - start_offset;
 666         skiprows = reduce_factor - start_offset / cur_step;
 667         srcptr += skiprows * *ds_cnt;
 668         for (col = 0; col < (*ds_cnt); col++)
 669             *dstptr++ = DNAN;
 670         row_cnt -= skiprows;
 671     }
 672 #ifdef DEBUG_REDUCE
 673     printf("row_cnt between: %lu\n", row_cnt);
 674 #endif
 675
 676     /* At the end we have some rows that are not going to be
 677      ** used, the amount is end_offset/cur_step
 678      */
 679     if (end_offset) {
 680         (*end) = (*end) - end_offset + (*step);
 681         skiprows = end_offset / cur_step;
 682         row_cnt -= skiprows;
 683     }
 684 #ifdef DEBUG_REDUCE
 685     printf("row_cnt after:   %lu\n", row_cnt);
 686 #endif
 687
 688 /* Sanity check: row_cnt should be multiple of reduce_factor */
 689 /* if this gets triggered, something is REALLY WRONG ... we die immediately */
 690
 691     if (row_cnt % reduce_factor) {
 692         printf("SANITY CHECK: %lu rows cannot be reduced by %i \n",
 693                row_cnt, reduce_factor);
 694         printf("BUG in reduce_data()\n");
 695         exit(1);
 696     }
 697
 698     /* Now combine reduce_factor intervals at a time
 699      ** into one interval for the destination.
 700      */
 701
 702     for (dst_row = 0; (long int) row_cnt >= reduce_factor; dst_row++) {
 703         for (col = 0; col < (*ds_cnt); col++) {
 704             rrd_value_t newval = DNAN;
 705             unsigned long validval = 0;
 706
 707             for (i = 0; i < reduce_factor; i++) {
 708                 if (isnan(srcptr[i * (*ds_cnt) + col])) {
 709                     continue;
 710                 }
 711                 validval++;
 712                 if (isnan(newval))
 713                     newval = srcptr[i * (*ds_cnt) + col];
 714                 else {
 715                     switch (cf) {
 716                     case CF_HWPREDICT:
 717                     case CF_MHWPREDICT:
 718                     case CF_DEVSEASONAL:
 719                     case CF_DEVPREDICT:
 720                     case CF_SEASONAL:
 721                     case CF_AVERAGE:
 722                         newval += srcptr[i * (*ds_cnt) + col];
 723                         break;
 724                     case CF_MINIMUM:
 725                         newval = min(newval, srcptr[i * (*ds_cnt) + col]);
 726                         break;
 727                     case CF_FAILURES:
 728                         /* an interval contains a failure if any subintervals contained a failure */
 729                     case CF_MAXIMUM:
 730                         newval = max(newval, srcptr[i * (*ds_cnt) + col]);
 731                         break;
 732                     case CF_LAST:
 733                         newval = srcptr[i * (*ds_cnt) + col];
 734                         break;
 735                     }
 736                 }
 737             }
 738             if (validval == 0) {
 739                 newval = DNAN;
 740             } else {
 741                 switch (cf) {
 742                 case CF_HWPREDICT:
 743                 case CF_MHWPREDICT:
 744                 case CF_DEVSEASONAL:
 745                 case CF_DEVPREDICT:
 746                 case CF_SEASONAL:
 747                 case CF_AVERAGE:
 748                     newval /= validval;
 749                     break;
 750                 case CF_MINIMUM:
 751                 case CF_FAILURES:
 752                 case CF_MAXIMUM:
 753                 case CF_LAST:
 754                     break;
 755                 }
 756             }
 757             *dstptr++ = newval;
 758         }
 759         srcptr += (*ds_cnt) * reduce_factor;
 760         row_cnt -= reduce_factor;
 761     }
 762     /* If we had to alter the endtime, we didn't have enough
 763      ** source rows to fill the last row. Fill it with NaN.
 764      */
 765     if (end_offset)
 766         for (col = 0; col < (*ds_cnt); col++)
 767             *dstptr++ = DNAN;
 768 #ifdef DEBUG_REDUCE
 769     row_cnt = ((*end) - (*start)) / *step;
 770     srcptr = *data;
 771     printf("Done reducing. Currently %lu rows, time %lu to %lu, step %lu\n",
 772            row_cnt, *start, *end, *step);
 773     for (col = 0; col < row_cnt; col++) {
 774         printf("time %10lu: ", *start + (col + 1) * (*step));
 775         for (i = 0; i < *ds_cnt; i++)
 776             printf(" %8.2e", srcptr[*ds_cnt * col + i]);
 777         printf("\n");
 778     }
 779 #endif
 780 }
 781
 782
 783 /* get the data required for the graphs from the
 784    relevant rrds ... */
 785
 786 int data_fetch(
 787     image_desc_t *im)
 788 {
 789     int       i, ii;
 790     int       skip;
 791
 792     /* pull the data from the rrd files ... */
 793     for (i = 0; i < (int) im->gdes_c; i++) {
 794         /* only GF_DEF elements fetch data */
 795         if (im->gdes[i].gf != GF_DEF)
 796             continue;
 797
 798         skip = 0;
 799         /* do we have it already ? */
 800         for (ii = 0; ii < i; ii++) {
 801             if (im->gdes[ii].gf != GF_DEF)
 802                 continue;
 803             if ((strcmp(im->gdes[i].rrd, im->gdes[ii].rrd) == 0)
 804                 && (im->gdes[i].cf == im->gdes[ii].cf)
 805                 && (im->gdes[i].cf_reduce == im->gdes[ii].cf_reduce)
 806                 && (im->gdes[i].start_orig == im->gdes[ii].start_orig)
 807                 && (im->gdes[i].end_orig == im->gdes[ii].end_orig)
 808                 && (im->gdes[i].step_orig == im->gdes[ii].step_orig)) {
 809                 /* OK, the data is already there.
 810                  ** Just copy the header portion
 811                  */
 812                 im->gdes[i].start = im->gdes[ii].start;
 813                 im->gdes[i].end = im->gdes[ii].end;
 814                 im->gdes[i].step = im->gdes[ii].step;
 815                 im->gdes[i].ds_cnt = im->gdes[ii].ds_cnt;
 816                 im->gdes[i].ds_namv = im->gdes[ii].ds_namv;
 817                 im->gdes[i].data = im->gdes[ii].data;
 818                 im->gdes[i].data_first = 0;
 819                 skip = 1;
 820             }
 821             if (skip)
 822                 break;
 823         }
 824         if (!skip) {
 825             unsigned long ft_step = im->gdes[i].step;   /* ft_step will record what we got from fetch */
 826
 827             if ((rrd_fetch_fn(im->gdes[i].rrd,
 828                               im->gdes[i].cf,
 829                               &im->gdes[i].start,
 830                               &im->gdes[i].end,
 831                               &ft_step,
 832                               &im->gdes[i].ds_cnt,
 833                               &im->gdes[i].ds_namv,
 834                               &im->gdes[i].data)) == -1) {
 835                 return -1;
 836             }
 837             im->gdes[i].data_first = 1;
 838
 839             if (ft_step < im->gdes[i].step) {
 840                 reduce_data(im->gdes[i].cf_reduce,
 841                             ft_step,
 842                             &im->gdes[i].start,
 843                             &im->gdes[i].end,
 844                             &im->gdes[i].step,
 845                             &im->gdes[i].ds_cnt, &im->gdes[i].data);
 846             } else {
 847                 im->gdes[i].step = ft_step;
 848             }
 849         }
 850
 851         /* lets see if the required data source is really there */
 852         for (ii = 0; ii < (int) im->gdes[i].ds_cnt; ii++) {
 853             if (strcmp(im->gdes[i].ds_namv[ii], im->gdes[i].ds_nam) == 0) {
 854                 im->gdes[i].ds = ii;
 855             }
 856         }
 857         if (im->gdes[i].ds == -1) {
 858             rrd_set_error("No DS called '%s' in '%s'",
 859                           im->gdes[i].ds_nam, im->gdes[i].rrd);
 860             return -1;
 861         }
 862
 863     }
 864     return 0;
 865 }
 866
 867 /* evaluate the expressions in the CDEF functions */
 868
 869 /*************************************************************
 870  * CDEF stuff
 871  *************************************************************/
 872
 873 long find_var_wrapper(
 874     void *arg1,
 875     char *key)
 876 {
 877     return find_var((image_desc_t *) arg1, key);
 878 }
 879
 880 /* find gdes containing var*/
 881 long find_var(
 882     image_desc_t *im,
 883     char *key)
 884 {
 885     long      ii;
 886
 887     for (ii = 0; ii < im->gdes_c - 1; ii++) {
 888         if ((im->gdes[ii].gf == GF_DEF
 889              || im->gdes[ii].gf == GF_VDEF || im->gdes[ii].gf == GF_CDEF)
 890             && (strcmp(im->gdes[ii].vname, key) == 0)) {
 891             return ii;
 892         }
 893     }
 894     return -1;
 895 }
 896
 897 /* find the largest common denominator for all the numbers
 898    in the 0 terminated num array */
 899 long lcd(
 900     long *num)
 901 {
 902     long      rest;
 903     int       i;
 904
 905     for (i = 0; num[i + 1] != 0; i++) {
 906         do {
 907             rest = num[i] % num[i + 1];
 908             num[i] = num[i + 1];
 909             num[i + 1] = rest;
 910         } while (rest != 0);
 911         num[i + 1] = num[i];
 912     }
 913 /*    return i==0?num[i]:num[i-1]; */
 914     return num[i];
 915 }
 916
 917 /* run the rpn calculator on all the VDEF and CDEF arguments */
 918 int data_calc(
 919     image_desc_t *im)
 920 {
 921
 922     int       gdi;
 923     int       dataidx;
 924     long     *steparray, rpi;
 925     int       stepcnt;
 926     time_t    now;
 927     rpnstack_t rpnstack;
 928
 929     rpnstack_init(&rpnstack);
 930
 931     for (gdi = 0; gdi < im->gdes_c; gdi++) {
 932         /* Look for GF_VDEF and GF_CDEF in the same loop,
 933          * so CDEFs can use VDEFs and vice versa
 934          */
 935         switch (im->gdes[gdi].gf) {
 936         case GF_XPORT:
 937             break;
 938         case GF_SHIFT:{
 939             graph_desc_t *vdp = &im->gdes[im->gdes[gdi].vidx];
 940
 941             /* remove current shift */
 942             vdp->start -= vdp->shift;
 943             vdp->end -= vdp->shift;
 944
 945             /* vdef */
 946             if (im->gdes[gdi].shidx >= 0)
 947                 vdp->shift = im->gdes[im->gdes[gdi].shidx].vf.val;
 948             /* constant */
 949             else
 950                 vdp->shift = im->gdes[gdi].shval;
 951
 952             /* normalize shift to multiple of consolidated step */
 953             vdp->shift = (vdp->shift / (long) vdp->step) * (long) vdp->step;
 954
 955             /* apply shift */
 956             vdp->start += vdp->shift;
 957             vdp->end += vdp->shift;
 958             break;
 959         }
 960         case GF_VDEF:
 961             /* A VDEF has no DS.  This also signals other parts
 962              * of rrdtool that this is a VDEF value, not a CDEF.
 963              */
 964             im->gdes[gdi].ds_cnt = 0;
 965             if (vdef_calc(im, gdi)) {
 966                 rrd_set_error("Error processing VDEF '%s'",
 967                               im->gdes[gdi].vname);
 968                 rpnstack_free(&rpnstack);
 969                 return -1;
 970             }
 971             break;
 972         case GF_CDEF:
 973             im->gdes[gdi].ds_cnt = 1;
 974             im->gdes[gdi].ds = 0;
 975             im->gdes[gdi].data_first = 1;
 976             im->gdes[gdi].start = 0;
 977             im->gdes[gdi].end = 0;
 978             steparray = NULL;
 979             stepcnt = 0;
 980             dataidx = -1;
 981
 982             /* Find the variables in the expression.
 983              * - VDEF variables are substituted by their values
 984              *   and the opcode is changed into OP_NUMBER.
 985              * - CDEF variables are analized for their step size,
 986              *   the lowest common denominator of all the step
 987              *   sizes of the data sources involved is calculated
 988              *   and the resulting number is the step size for the
 989              *   resulting data source.
 990              */
 991             for (rpi = 0; im->gdes[gdi].rpnp[rpi].op != OP_END; rpi++) {
 992                 if (im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
 993                     im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER) {
 994                     long      ptr = im->gdes[gdi].rpnp[rpi].ptr;
 995
 996                     if (im->gdes[ptr].ds_cnt == 0) {    /* this is a VDEF data source */
 997 #if 0
 998                         printf
 999                             ("DEBUG: inside CDEF '%s' processing VDEF '%s'\n",
1000                              im->gdes[gdi].vname, im->gdes[ptr].vname);
1001                         printf("DEBUG: value from vdef is %f\n",
1002                                im->gdes[ptr].vf.val);
1003 #endif
1004                         im->gdes[gdi].rpnp[rpi].val = im->gdes[ptr].vf.val;
1005                         im->gdes[gdi].rpnp[rpi].op = OP_NUMBER;
1006                     } else {    /* normal variables and PREF(variables) */
1007
1008                         /* add one entry to the array that keeps track of the step sizes of the
1009                          * data sources going into the CDEF. */
1010                         if ((steparray =
1011                              rrd_realloc(steparray,
1012                                          (++stepcnt +
1013                                           1) * sizeof(*steparray))) == NULL) {
1014                             rrd_set_error("realloc steparray");
1015                             rpnstack_free(&rpnstack);
1016                             return -1;
1017                         };
1018
1019                         steparray[stepcnt - 1] = im->gdes[ptr].step;
1020
1021                         /* adjust start and end of cdef (gdi) so
1022                          * that it runs from the latest start point
1023                          * to the earliest endpoint of any of the
1024                          * rras involved (ptr)
1025                          */
1026
1027                         if (im->gdes[gdi].start < im->gdes[ptr].start)
1028                             im->gdes[gdi].start = im->gdes[ptr].start;
1029
1030                         if (im->gdes[gdi].end == 0 ||
1031                             im->gdes[gdi].end > im->gdes[ptr].end)
1032                             im->gdes[gdi].end = im->gdes[ptr].end;
1033
1034                         /* store pointer to the first element of
1035                          * the rra providing data for variable,
1036                          * further save step size and data source
1037                          * count of this rra
1038                          */
1039                         im->gdes[gdi].rpnp[rpi].data =
1040                             im->gdes[ptr].data + im->gdes[ptr].ds;
1041                         im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
1042                         im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
1043
1044                         /* backoff the *.data ptr; this is done so
1045                          * rpncalc() function doesn't have to treat
1046                          * the first case differently
1047                          */
1048                     }   /* if ds_cnt != 0 */
1049                 }       /* if OP_VARIABLE */
1050             }           /* loop through all rpi */
1051
1052             /* move the data pointers to the correct period */
1053             for (rpi = 0; im->gdes[gdi].rpnp[rpi].op != OP_END; rpi++) {
1054                 if (im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
1055                     im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER) {
1056                     long      ptr = im->gdes[gdi].rpnp[rpi].ptr;
1057                     long      diff =
1058                         im->gdes[gdi].start - im->gdes[ptr].start;
1059
1060                     if (diff > 0)
1061                         im->gdes[gdi].rpnp[rpi].data +=
1062                             (diff / im->gdes[ptr].step) *
1063                             im->gdes[ptr].ds_cnt;
1064                 }
1065             }
1066
1067             if (steparray == NULL) {
1068                 rrd_set_error("rpn expressions without DEF"
1069                               " or CDEF variables are not supported");
1070                 rpnstack_free(&rpnstack);
1071                 return -1;
1072             }
1073             steparray[stepcnt] = 0;
1074             /* Now find the resulting step.  All steps in all
1075              * used RRAs have to be visited
1076              */
1077             im->gdes[gdi].step = lcd(steparray);
1078             free(steparray);
1079             if ((im->gdes[gdi].data = malloc(((im->gdes[gdi].end -
1080                                                im->gdes[gdi].start)
1081                                               / im->gdes[gdi].step)
1082                                              * sizeof(double))) == NULL) {
1083                 rrd_set_error("malloc im->gdes[gdi].data");
1084                 rpnstack_free(&rpnstack);
1085                 return -1;
1086             }
1087
1088             /* Step through the new cdef results array and
1089              * calculate the values
1090              */
1091             for (now = im->gdes[gdi].start + im->gdes[gdi].step;
1092                  now <= im->gdes[gdi].end; now += im->gdes[gdi].step) {
1093                 rpnp_t   *rpnp = im->gdes[gdi].rpnp;
1094
1095                 /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
1096                  * in this case we are advancing by timesteps;
1097                  * we use the fact that time_t is a synonym for long
1098                  */
1099                 if (rpn_calc(rpnp, &rpnstack, (long) now,
1100                              im->gdes[gdi].data, ++dataidx) == -1) {
1101                     /* rpn_calc sets the error string */
1102                     rpnstack_free(&rpnstack);
1103                     return -1;
1104                 }
1105             }           /* enumerate over time steps within a CDEF */
1106             break;
1107         default:
1108             continue;
1109         }
1110     }                   /* enumerate over CDEFs */
1111     rpnstack_free(&rpnstack);
1112     return 0;
1113 }
1114
1115 /* from http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm */
1116 /* yes we are loosing precision by doing tos with floats instead of doubles
1117    but it seems more stable this way. */
1118
1119 static int AlmostEqual2sComplement(
1120     float A,
1121     float B,
1122     int maxUlps)
1123 {
1124
1125     int       aInt = *(int *) &A;
1126     int       bInt = *(int *) &B;
1127     int       intDiff;
1128
1129     /* Make sure maxUlps is non-negative and small enough that the
1130        default NAN won't compare as equal to anything.  */
1131
1132     /* assert(maxUlps > 0 && maxUlps < 4 * 1024 * 1024); */
1133
1134     /* Make aInt lexicographically ordered as a twos-complement int */
1135
1136     if (aInt < 0)
1137         aInt = 0x80000000l - aInt;
1138
1139     /* Make bInt lexicographically ordered as a twos-complement int */
1140
1141     if (bInt < 0)
1142         bInt = 0x80000000l - bInt;
1143
1144     intDiff = abs(aInt - bInt);
1145
1146     if (intDiff <= maxUlps)
1147         return 1;
1148
1149     return 0;
1150 }
1151
1152 /* massage data so, that we get one value for each x coordinate in the graph */
1153 int data_proc(
1154     image_desc_t *im)
1155 {
1156     long      i, ii;
1157     double    pixstep = (double) (im->end - im->start)
1158         / (double) im->xsize;   /* how much time
1159                                    passes in one pixel */
1160     double    paintval;
1161     double    minval = DNAN, maxval = DNAN;
1162
1163     unsigned long gr_time;
1164
1165     /* memory for the processed data */
1166     for (i = 0; i < im->gdes_c; i++) {
1167         if ((im->gdes[i].gf == GF_LINE) ||
1168             (im->gdes[i].gf == GF_AREA) || (im->gdes[i].gf == GF_TICK)) {
1169             if ((im->gdes[i].p_data = malloc((im->xsize + 1)
1170                                              * sizeof(rrd_value_t))) == NULL) {
1171                 rrd_set_error("malloc data_proc");
1172                 return -1;
1173             }
1174         }
1175     }
1176
1177     for (i = 0; i < im->xsize; i++) {   /* for each pixel */
1178         long      vidx;
1179
1180         gr_time = im->start + pixstep * i;  /* time of the current step */
1181         paintval = 0.0;
1182
1183         for (ii = 0; ii < im->gdes_c; ii++) {
1184             double    value;
1185
1186             switch (im->gdes[ii].gf) {
1187             case GF_LINE:
1188             case GF_AREA:
1189             case GF_TICK:
1190                 if (!im->gdes[ii].stack)
1191                     paintval = 0.0;
1192                 value = im->gdes[ii].yrule;
1193                 if (isnan(value) || (im->gdes[ii].gf == GF_TICK)) {
1194                     /* The time of the data doesn't necessarily match
1195                      ** the time of the graph. Beware.
1196                      */
1197                     vidx = im->gdes[ii].vidx;
1198                     if (im->gdes[vidx].gf == GF_VDEF) {
1199                         value = im->gdes[vidx].vf.val;
1200                     } else
1201                         if (((long int) gr_time >=
1202                              (long int) im->gdes[vidx].start)
1203                             && ((long int) gr_time <=
1204                                 (long int) im->gdes[vidx].end)) {
1205                         value = im->gdes[vidx].data[(unsigned long)
1206                                                     floor((double)
1207                                                           (gr_time -
1208                                                            im->gdes[vidx].
1209                                                            start)
1210                                                           /
1211                                                           im->gdes[vidx].step)
1212                                                     * im->gdes[vidx].ds_cnt +
1213                                                     im->gdes[vidx].ds];
1214                     } else {
1215                         value = DNAN;
1216                     }
1217                 };
1218
1219                 if (!isnan(value)) {
1220                     paintval += value;
1221                     im->gdes[ii].p_data[i] = paintval;
1222                     /* GF_TICK: the data values are not
1223                      ** relevant for min and max
1224                      */
1225                     if (finite(paintval) && im->gdes[ii].gf != GF_TICK) {
1226                         if ((isnan(minval) || paintval < minval) &&
1227                             !(im->logarithmic && paintval <= 0.0))
1228                             minval = paintval;
1229                         if (isnan(maxval) || paintval > maxval)
1230                             maxval = paintval;
1231                     }
1232                 } else {
1233                     im->gdes[ii].p_data[i] = DNAN;
1234                 }
1235                 break;
1236             case GF_STACK:
1237                 rrd_set_error
1238                     ("STACK should already be turned into LINE or AREA here");
1239                 return -1;
1240                 break;
1241             default:
1242                 break;
1243             }
1244         }
1245     }
1246
1247     /* if min or max have not been asigned a value this is because
1248        there was no data in the graph ... this is not good ...
1249        lets set these to dummy values then ... */
1250
1251     if (im->logarithmic) {
1252         if (isnan(minval) || isnan(maxval) || maxval <= 0) {
1253             minval = 0.0;   /* catching this right away below */
1254             maxval = 5.1;
1255         }
1256         /* in logarithm mode, where minval is smaller or equal
1257            to 0 make the beast just way smaller than maxval */
1258         if (minval <= 0) {
1259             minval = maxval / 10e8;
1260         }
1261     } else {
1262         if (isnan(minval) || isnan(maxval)) {
1263             minval = 0.0;
1264             maxval = 1.0;
1265         }
1266     }
1267
1268     /* adjust min and max values given by the user */
1269     /* for logscale we add something on top */
1270     if (isnan(im->minval)
1271         || ((!im->rigid) && im->minval > minval)
1272         ) {
1273         if (im->logarithmic)
1274             im->minval = minval / 2.0;
1275         else
1276             im->minval = minval;
1277     }
1278     if (isnan(im->maxval)
1279         || (!im->rigid && im->maxval < maxval)
1280         ) {
1281         if (im->logarithmic)
1282             im->maxval = maxval * 2.0;
1283         else
1284             im->maxval = maxval;
1285     }
1286
1287     /* make sure min is smaller than max */
1288     if (im->minval > im->maxval) {
1289         if (im->minval > 0)
1290             im->minval = 0.99 * im->maxval;
1291         else
1292             im->minval = 1.01 * im->maxval;
1293     }
1294
1295     /* make sure min and max are not equal */
1296     if (AlmostEqual2sComplement(im->minval, im->maxval, 4)) {
1297         if (im->maxval > 0)
1298             im->maxval *= 1.01;
1299         else
1300             im->maxval *= 0.99;
1301
1302         /* make sure min and max are not both zero */
1303         if (AlmostEqual2sComplement(im->maxval, 0, 4)) {
1304             im->maxval = 1.0;
1305         }
1306     }
1307     return 0;
1308 }
1309
1310
1311
1312 /* identify the point where the first gridline, label ... gets placed */
1313
1314 time_t find_first_time(
1315     time_t start,       /* what is the initial time */
1316     enum tmt_en baseint,    /* what is the basic interval */
1317     long basestep       /* how many if these do we jump a time */
1318     )
1319 {
1320     struct tm tm;
1321
1322     localtime_r(&start, &tm);
1323
1324     switch (baseint) {
1325     case TMT_SECOND:
1326         tm.       tm_sec -= tm.tm_sec % basestep;
1327
1328         break;
1329     case TMT_MINUTE:
1330         tm.       tm_sec = 0;
1331         tm.       tm_min -= tm.tm_min % basestep;
1332
1333         break;
1334     case TMT_HOUR:
1335         tm.       tm_sec = 0;
1336         tm.       tm_min = 0;
1337         tm.       tm_hour -= tm.tm_hour % basestep;
1338
1339         break;
1340     case TMT_DAY:
1341         /* we do NOT look at the basestep for this ... */
1342         tm.       tm_sec = 0;
1343         tm.       tm_min = 0;
1344         tm.       tm_hour = 0;
1345
1346         break;
1347     case TMT_WEEK:
1348         /* we do NOT look at the basestep for this ... */
1349         tm.       tm_sec = 0;
1350         tm.       tm_min = 0;
1351         tm.       tm_hour = 0;
1352         tm.       tm_mday -= tm.tm_wday - 1;    /* -1 because we want the monday */
1353
1354         if (tm.tm_wday == 0)
1355             tm.       tm_mday -= 7; /* we want the *previous* monday */
1356
1357         break;
1358     case TMT_MONTH:
1359         tm.       tm_sec = 0;
1360         tm.       tm_min = 0;
1361         tm.       tm_hour = 0;
1362         tm.       tm_mday = 1;
1363         tm.       tm_mon -= tm.tm_mon % basestep;
1364
1365         break;
1366
1367     case TMT_YEAR:
1368         tm.       tm_sec = 0;
1369         tm.       tm_min = 0;
1370         tm.       tm_hour = 0;
1371         tm.       tm_mday = 1;
1372         tm.       tm_mon = 0;
1373         tm.       tm_year -= (
1374     tm.tm_year + 1900) %basestep;
1375
1376     }
1377     return mktime(&tm);
1378 }
1379
1380 /* identify the point where the next gridline, label ... gets placed */
1381 time_t find_next_time(
1382     time_t current,     /* what is the initial time */
1383     enum tmt_en baseint,    /* what is the basic interval */
1384     long basestep       /* how many if these do we jump a time */
1385     )
1386 {
1387     struct tm tm;
1388     time_t    madetime;
1389
1390     localtime_r(&current, &tm);
1391
1392     do {
1393         switch (baseint) {
1394         case TMT_SECOND:
1395             tm.       tm_sec += basestep;
1396
1397             break;
1398         case TMT_MINUTE:
1399             tm.       tm_min += basestep;
1400
1401             break;
1402         case TMT_HOUR:
1403             tm.       tm_hour += basestep;
1404
1405             break;
1406         case TMT_DAY:
1407             tm.       tm_mday += basestep;
1408
1409             break;
1410         case TMT_WEEK:
1411             tm.       tm_mday += 7 * basestep;
1412
1413             break;
1414         case TMT_MONTH:
1415             tm.       tm_mon += basestep;
1416
1417             break;
1418         case TMT_YEAR:
1419             tm.       tm_year += basestep;
1420         }
1421         madetime = mktime(&tm);
1422     } while (madetime == -1);   /* this is necessary to skip impssible times
1423                                    like the daylight saving time skips */
1424     return madetime;
1425
1426 }
1427
1428
1429 /* calculate values required for PRINT and GPRINT functions */
1430
1431 int print_calc(
1432     image_desc_t *im)
1433 {
1434     long      i, ii, validsteps;
1435     double    printval;
1436     struct tm tmvdef;
1437     int       graphelement = 0;
1438     long      vidx;
1439     int       max_ii;
1440     double    magfact = -1;
1441     char     *si_symb = "";
1442     char     *percent_s;
1443     int       prline_cnt = 0;
1444
1445     /* wow initializing tmvdef is quite a task :-) */
1446     time_t    now = time(NULL);
1447
1448     localtime_r(&now, &tmvdef);
1449     for (i = 0; i < im->gdes_c; i++) {
1450         vidx = im->gdes[i].vidx;
1451         switch (im->gdes[i].gf) {
1452         case GF_PRINT:
1453         case GF_GPRINT:
1454             /* PRINT and GPRINT can now print VDEF generated values.
1455              * There's no need to do any calculations on them as these
1456              * calculations were already made.
1457              */
1458             if (im->gdes[vidx].gf == GF_VDEF) { /* simply use vals */
1459                 printval = im->gdes[vidx].vf.val;
1460                 localtime_r(&im->gdes[vidx].vf.when, &tmvdef);
1461             } else {    /* need to calculate max,min,avg etcetera */
1462                 max_ii = ((im->gdes[vidx].end - im->gdes[vidx].start)
1463                           / im->gdes[vidx].step * im->gdes[vidx].ds_cnt);
1464                 printval = DNAN;
1465                 validsteps = 0;
1466                 for (ii = im->gdes[vidx].ds;
1467                      ii < max_ii; ii += im->gdes[vidx].ds_cnt) {
1468                     if (!finite(im->gdes[vidx].data[ii]))
1469                         continue;
1470                     if (isnan(printval)) {
1471                         printval = im->gdes[vidx].data[ii];
1472                         validsteps++;
1473                         continue;
1474                     }
1475
1476                     switch (im->gdes[i].cf) {
1477                     case CF_HWPREDICT:
1478                     case CF_MHWPREDICT:
1479                     case CF_DEVPREDICT:
1480                     case CF_DEVSEASONAL:
1481                     case CF_SEASONAL:
1482                     case CF_AVERAGE:
1483                         validsteps++;
1484                         printval += im->gdes[vidx].data[ii];
1485                         break;
1486                     case CF_MINIMUM:
1487                         printval = min(printval, im->gdes[vidx].data[ii]);
1488                         break;
1489                     case CF_FAILURES:
1490                     case CF_MAXIMUM:
1491                         printval = max(printval, im->gdes[vidx].data[ii]);
1492                         break;
1493                     case CF_LAST:
1494                         printval = im->gdes[vidx].data[ii];
1495                     }
1496                 }
1497                 if (im->gdes[i].cf == CF_AVERAGE || im->gdes[i].cf > CF_LAST) {
1498                     if (validsteps > 1) {
1499                         printval = (printval / validsteps);
1500                     }
1501                 }
1502             }           /* prepare printval */
1503
1504             if ((percent_s = strstr(im->gdes[i].format, "%S")) != NULL) {
1505                 /* Magfact is set to -1 upon entry to print_calc.  If it
1506                  * is still less than 0, then we need to run auto_scale.
1507                  * Otherwise, put the value into the correct units.  If
1508                  * the value is 0, then do not set the symbol or magnification
1509                  * so next the calculation will be performed again. */
1510                 if (magfact < 0.0) {
1511                     auto_scale(im, &printval, &si_symb, &magfact);
1512                     if (printval == 0.0)
1513                         magfact = -1.0;
1514                 } else {
1515                     printval /= magfact;
1516                 }
1517                 *(++percent_s) = 's';
1518             } else if (strstr(im->gdes[i].format, "%s") != NULL) {
1519                 auto_scale(im, &printval, &si_symb, &magfact);
1520             }
1521
1522             if (im->gdes[i].gf == GF_PRINT) {
1523                 rrd_infoval_t prline;
1524
1525                 if (im->gdes[i].strftm) {
1526                     prline.u_str = malloc((FMT_LEG_LEN + 2) * sizeof(char));
1527                     strftime(prline.u_str,
1528                              FMT_LEG_LEN, im->gdes[i].format, &tmvdef);
1529                 } else if (bad_format(im->gdes[i].format)) {
1530                     rrd_set_error
1531                         ("bad format for PRINT in '%s'", im->gdes[i].format);
1532                     return -1;
1533                 } else {
1534                     prline.u_str =
1535                         sprintf_alloc(im->gdes[i].format, printval, si_symb);
1536                 }
1537                 grinfo_push(im,
1538                             sprintf_alloc
1539                             ("print[%ld]", prline_cnt++), RD_I_STR, prline);
1540                 free(prline.u_str);
1541             } else {
1542                 /* GF_GPRINT */
1543
1544                 if (im->gdes[i].strftm) {
1545                     strftime(im->gdes[i].legend,
1546                              FMT_LEG_LEN, im->gdes[i].format, &tmvdef);
1547                 } else {
1548                     if (bad_format(im->gdes[i].format)) {
1549                         rrd_set_error
1550                             ("bad format for GPRINT in '%s'",
1551                              im->gdes[i].format);
1552                         return -1;
1553                     }
1554 #ifdef HAVE_SNPRINTF
1555                     snprintf(im->gdes[i].legend,
1556                              FMT_LEG_LEN - 2,
1557                              im->gdes[i].format, printval, si_symb);
1558 #else
1559                     sprintf(im->gdes[i].legend,
1560                             im->gdes[i].format, printval, si_symb);
1561 #endif
1562                 }
1563                 graphelement = 1;
1564             }
1565             break;
1566         case GF_LINE:
1567         case GF_AREA:
1568         case GF_TICK:
1569             graphelement = 1;
1570             break;
1571         case GF_HRULE:
1572             if (isnan(im->gdes[i].yrule)) { /* we must set this here or the legend printer can not decide to print the legend */
1573                 im->gdes[i].yrule = im->gdes[vidx].vf.val;
1574             };
1575             graphelement = 1;
1576             break;
1577         case GF_VRULE:
1578             if (im->gdes[i].xrule == 0) {   /* again ... the legend printer needs it */
1579                 im->gdes[i].xrule = im->gdes[vidx].vf.when;
1580             };
1581             graphelement = 1;
1582             break;
1583         case GF_COMMENT:
1584         case GF_TEXTALIGN:
1585         case GF_DEF:
1586         case GF_CDEF:
1587         case GF_VDEF:
1588 #ifdef WITH_PIECHART
1589         case GF_PART:
1590 #endif
1591         case GF_SHIFT:
1592         case GF_XPORT:
1593             break;
1594         case GF_STACK:
1595             rrd_set_error
1596                 ("STACK should already be turned into LINE or AREA here");
1597             return -1;
1598             break;
1599         }
1600     }
1601     return graphelement;
1602 }
1603
1604
1605 /* place legends with color spots */
1606 int leg_place(
1607     image_desc_t *im,
1608     int *gY)
1609 {
1610     /* graph labels */
1611     int       interleg = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
1612     int       border = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
1613     int       fill = 0, fill_last;
1614     int       leg_c = 0;
1615     int       leg_x = border;
1616     int       leg_y = im->yimg;
1617     int       leg_y_prev = im->yimg;
1618     int       leg_cc;
1619     int       glue = 0;
1620     int       i, ii, mark = 0;
1621     char      prt_fctn; /*special printfunctions */
1622     char      default_txtalign = TXA_JUSTIFIED; /*default line orientation */
1623     int      *legspace;
1624     char     *tab;
1625
1626     if (!(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH)) {
1627         if ((legspace = malloc(im->gdes_c * sizeof(int))) == NULL) {
1628             rrd_set_error("malloc for legspace");
1629             return -1;
1630         }
1631
1632         if (im->extra_flags & FULL_SIZE_MODE)
1633             leg_y = leg_y_prev =
1634                 leg_y - (int) (im->text_prop[TEXT_PROP_LEGEND].size * 1.8);
1635         for (i = 0; i < im->gdes_c; i++) {
1636             fill_last = fill;
1637             /* hide legends for rules which are not displayed */
1638             if (im->gdes[i].gf == GF_TEXTALIGN) {
1639                 default_txtalign = im->gdes[i].txtalign;
1640             }
1641
1642             if (!(im->extra_flags & FORCE_RULES_LEGEND)) {
1643                 if (im->gdes[i].gf == GF_HRULE
1644                     && (im->gdes[i].yrule <
1645                         im->minval || im->gdes[i].yrule > im->maxval))
1646                     im->gdes[i].legend[0] = '\0';
1647                 if (im->gdes[i].gf == GF_VRULE
1648                     && (im->gdes[i].xrule <
1649                         im->start || im->gdes[i].xrule > im->end))
1650                     im->gdes[i].legend[0] = '\0';
1651             }
1652
1653             /* turn \\t into tab */
1654             while ((tab = strstr(im->gdes[i].legend, "\\t"))) {
1655                 memmove(tab, tab + 1, strlen(tab));
1656                 tab[0] = (char) 9;
1657             }
1658             leg_cc = strlen(im->gdes[i].legend);
1659             /* is there a controle code ant the end of the legend string ? */
1660             if (leg_cc >= 2 && im->gdes[i].legend[leg_cc - 2] == '\\') {
1661                 prt_fctn = im->gdes[i].legend[leg_cc - 1];
1662                 leg_cc -= 2;
1663                 im->gdes[i].legend[leg_cc] = '\0';
1664             } else {
1665                 prt_fctn = '\0';
1666             }
1667             /* only valid control codes */
1668             if (prt_fctn != 'l' && prt_fctn != 'n' &&   /* a synonym for l */
1669                 prt_fctn != 'r' &&
1670                 prt_fctn != 'j' &&
1671                 prt_fctn != 'c' &&
1672                 prt_fctn != 's' && prt_fctn != '\0' && prt_fctn != 'g') {
1673                 free(legspace);
1674                 rrd_set_error
1675                     ("Unknown control code at the end of '%s\\%c'",
1676                      im->gdes[i].legend, prt_fctn);
1677                 return -1;
1678             }
1679             /* \n -> \l */
1680             if (prt_fctn == 'n') {
1681                 prt_fctn = 'l';
1682             }
1683
1684             /* remove exess space from the end of the legend for \g */
1685             while (prt_fctn == 'g' &&
1686                    leg_cc > 0 && im->gdes[i].legend[leg_cc - 1] == ' ') {
1687                 leg_cc--;
1688                 im->gdes[i].legend[leg_cc] = '\0';
1689             }
1690
1691             if (leg_cc != 0) {
1692
1693                 /* no interleg space if string ends in \g */
1694                 legspace[i] = (prt_fctn == 'g' ? 0 : interleg);
1695                 if (fill > 0) {
1696                     fill += legspace[i];
1697                 }
1698                 fill +=
1699                     gfx_get_text_width(im,
1700                                        fill + border,
1701                                        im->
1702                                        text_prop
1703                                        [TEXT_PROP_LEGEND].
1704                                        font,
1705                                        im->
1706                                        text_prop
1707                                        [TEXT_PROP_LEGEND].
1708                                        size,
1709                                        im->tabwidth, im->gdes[i].legend);
1710                 leg_c++;
1711             } else {
1712                 legspace[i] = 0;
1713             }
1714             /* who said there was a special tag ... ? */
1715             if (prt_fctn == 'g') {
1716                 prt_fctn = '\0';
1717             }
1718
1719             if (prt_fctn == '\0') {
1720                 if (i == im->gdes_c - 1 || fill > im->ximg - 2 * border) {
1721                     /* just one legend item is left right or center */
1722                     switch (default_txtalign) {
1723                     case TXA_RIGHT:
1724                         prt_fctn = 'r';
1725                         break;
1726                     case TXA_CENTER:
1727                         prt_fctn = 'c';
1728                         break;
1729                     case TXA_JUSTIFIED:
1730                         prt_fctn = 'j';
1731                         break;
1732                     default:
1733                         prt_fctn = 'l';
1734                         break;
1735                     }
1736                 }
1737                 /* is it time to place the legends ? */
1738                 if (fill > im->ximg - 2 * border) {
1739                     if (leg_c > 1) {
1740                         /* go back one */
1741                         i--;
1742                         fill = fill_last;
1743                         leg_c--;
1744                     }
1745                 }
1746                 if (leg_c == 1 && prt_fctn == 'j') {
1747                     prt_fctn = 'l';
1748                 }
1749             }
1750
1751
1752             if (prt_fctn != '\0') {
1753                 leg_x = border;
1754                 if (leg_c >= 2 && prt_fctn == 'j') {
1755                     glue = (im->ximg - fill - 2 * border) / (leg_c - 1);
1756                 } else {
1757                     glue = 0;
1758                 }
1759                 if (prt_fctn == 'c')
1760                     leg_x = (im->ximg - fill) / 2.0;
1761                 if (prt_fctn == 'r')
1762                     leg_x = im->ximg - fill - border;
1763                 for (ii = mark; ii <= i; ii++) {
1764                     if (im->gdes[ii].legend[0] == '\0')
1765                         continue;   /* skip empty legends */
1766                     im->gdes[ii].leg_x = leg_x;
1767                     im->gdes[ii].leg_y = leg_y;
1768                     leg_x +=
1769                         gfx_get_text_width(im, leg_x,
1770                                            im->
1771                                            text_prop
1772                                            [TEXT_PROP_LEGEND].
1773                                            font,
1774                                            im->
1775                                            text_prop
1776                                            [TEXT_PROP_LEGEND].
1777                                            size,
1778                                            im->tabwidth, im->gdes[ii].legend)
1779                         + legspace[ii]
1780                         + glue;
1781                 }
1782                 leg_y_prev = leg_y;
1783                 if (im->extra_flags & FULL_SIZE_MODE) {
1784                     /* only add y space if there was text on the line */
1785                     if (leg_x > border || prt_fctn == 's')
1786                         leg_y -= im->text_prop[TEXT_PROP_LEGEND].size * 1.8;
1787                     if (prt_fctn == 's')
1788                         leg_y += im->text_prop[TEXT_PROP_LEGEND].size;
1789                 } else {
1790                     if (leg_x > border || prt_fctn == 's')
1791                         leg_y += im->text_prop[TEXT_PROP_LEGEND].size * 1.8;
1792                     if (prt_fctn == 's')
1793                         leg_y -= im->text_prop[TEXT_PROP_LEGEND].size;
1794                 }
1795                 fill = 0;
1796                 leg_c = 0;
1797                 mark = ii;
1798             }
1799         }
1800
1801         if (im->extra_flags & FULL_SIZE_MODE) {
1802             if (leg_y != leg_y_prev) {
1803                 *gY = leg_y - im->text_prop[TEXT_PROP_LEGEND].size * 1.8;
1804                 im->yorigin =
1805                     leg_y - im->text_prop[TEXT_PROP_LEGEND].size * 1.8;
1806             }
1807         } else {
1808             im->yimg =
1809                 leg_y - im->text_prop[TEXT_PROP_LEGEND].size * 1.8 +
1810                 border * 0.6;
1811         }
1812         free(legspace);
1813     }
1814     return 0;
1815 }
1816
1817 /* create a grid on the graph. it determines what to do
1818    from the values of xsize, start and end */
1819
1820 /* the xaxis labels are determined from the number of seconds per pixel
1821    in the requested graph */
1822
1823 int calc_horizontal_grid(
1824     image_desc_t
1825     *im)
1826 {
1827     double    range;
1828     double    scaledrange;
1829     int       pixel, i;
1830     int       gridind = 0;
1831     int       decimals, fractionals;
1832
1833     im->ygrid_scale.labfact = 2;
1834     range = im->maxval - im->minval;
1835     scaledrange = range / im->magfact;
1836     /* does the scale of this graph make it impossible to put lines
1837        on it? If so, give up. */
1838     if (isnan(scaledrange)) {
1839         return 0;
1840     }
1841
1842     /* find grid spaceing */
1843     pixel = 1;
1844     if (isnan(im->ygridstep)) {
1845         if (im->extra_flags & ALTYGRID) {
1846             /* find the value with max number of digits. Get number of digits */
1847             decimals =
1848                 ceil(log10
1849                      (max(fabs(im->maxval), fabs(im->minval)) *
1850                       im->viewfactor / im->magfact));
1851             if (decimals <= 0)  /* everything is small. make place for zero */
1852                 decimals = 1;
1853             im->ygrid_scale.gridstep =
1854                 pow((double) 10,
1855                     floor(log10(range * im->viewfactor / im->magfact))) /
1856                 im->viewfactor * im->magfact;
1857             if (im->ygrid_scale.gridstep == 0)  /* range is one -> 0.1 is reasonable scale */
1858                 im->ygrid_scale.gridstep = 0.1;
1859             /* should have at least 5 lines but no more then 15 */
1860             if (range / im->ygrid_scale.gridstep < 5
1861                 && im->ygrid_scale.gridstep >= 30)
1862                 im->ygrid_scale.gridstep /= 10;
1863             if (range / im->ygrid_scale.gridstep > 15)
1864                 im->ygrid_scale.gridstep *= 10;
1865             if (range / im->ygrid_scale.gridstep > 5) {
1866                 im->ygrid_scale.labfact = 1;
1867                 if (range / im->ygrid_scale.gridstep > 8
1868                     || im->ygrid_scale.gridstep <
1869                     1.8 * im->text_prop[TEXT_PROP_AXIS].size)
1870                     im->ygrid_scale.labfact = 2;
1871             } else {
1872                 im->ygrid_scale.gridstep /= 5;
1873                 im->ygrid_scale.labfact = 5;
1874             }
1875             fractionals =
1876                 floor(log10
1877                       (im->ygrid_scale.gridstep *
1878                        (double) im->ygrid_scale.labfact * im->viewfactor /
1879                        im->magfact));
1880             if (fractionals < 0) {  /* small amplitude. */
1881                 int       len = decimals - fractionals + 1;
1882
1883                 if (im->unitslength < len + 2)
1884                     im->unitslength = len + 2;
1885                 sprintf(im->ygrid_scale.labfmt,
1886                         "%%%d.%df%s", len,
1887                         -fractionals, (im->symbol != ' ' ? " %c" : ""));
1888             } else {
1889                 int       len = decimals + 1;
1890
1891                 if (im->unitslength < len + 2)
1892                     im->unitslength = len + 2;
1893                 sprintf(im->ygrid_scale.labfmt,
1894                         "%%%d.0f%s", len, (im->symbol != ' ' ? " %c" : ""));
1895             }
1896         } else {        /* classic rrd grid */
1897             for (i = 0; ylab[i].grid > 0; i++) {
1898                 pixel = im->ysize / (scaledrange / ylab[i].grid);
1899                 gridind = i;
1900                 if (pixel >= 5)
1901                     break;
1902             }
1903
1904             for (i = 0; i < 4; i++) {
1905                 if (pixel * ylab[gridind].lfac[i] >=
1906                     1.8 * im->text_prop[TEXT_PROP_AXIS].size) {
1907                     im->ygrid_scale.labfact = ylab[gridind].lfac[i];
1908                     break;
1909                 }
1910             }
1911
1912             im->ygrid_scale.gridstep = ylab[gridind].grid * im->magfact;
1913         }
1914     } else {
1915         im->ygrid_scale.gridstep = im->ygridstep;
1916         im->ygrid_scale.labfact = im->ylabfact;
1917     }
1918     return 1;
1919 }
1920
1921 int draw_horizontal_grid(
1922     image_desc_t
1923     *im)
1924 {
1925     int       i;
1926     double    scaledstep;
1927     char      graph_label[100];
1928     int       nlabels = 0;
1929     double    X0 = im->xorigin;
1930     double    X1 = im->xorigin + im->xsize;
1931     int       sgrid = (int) (im->minval / im->ygrid_scale.gridstep - 1);
1932     int       egrid = (int) (im->maxval / im->ygrid_scale.gridstep + 1);
1933     double    MaxY;
1934
1935     scaledstep =
1936         im->ygrid_scale.gridstep /
1937         (double) im->magfact * (double) im->viewfactor;
1938     MaxY = scaledstep * (double) egrid;
1939     for (i = sgrid; i <= egrid; i++) {
1940         double    Y0 = ytr(im,
1941                            im->ygrid_scale.gridstep * i);
1942         double    YN = ytr(im,
1943                            im->ygrid_scale.gridstep * (i + 1));
1944
1945         if (floor(Y0 + 0.5) >=
1946             im->yorigin - im->ysize && floor(Y0 + 0.5) <= im->yorigin) {
1947             /* Make sure at least 2 grid labels are shown, even if it doesn't agree
1948                with the chosen settings. Add a label if required by settings, or if
1949                there is only one label so far and the next grid line is out of bounds. */
1950             if (i % im->ygrid_scale.labfact == 0
1951                 || (nlabels == 1
1952                     && (YN < im->yorigin - im->ysize || YN > im->yorigin))) {
1953                 if (im->symbol == ' ') {
1954                     if (im->extra_flags & ALTYGRID) {
1955                         sprintf(graph_label,
1956                                 im->ygrid_scale.labfmt,
1957                                 scaledstep * (double) i);
1958                     } else {
1959                         if (MaxY < 10) {
1960                             sprintf(graph_label, "%4.1f",
1961                                     scaledstep * (double) i);
1962                         } else {
1963                             sprintf(graph_label, "%4.0f",
1964                                     scaledstep * (double) i);
1965                         }
1966                     }
1967                 } else {
1968                     char      sisym = (i == 0 ? ' ' : im->symbol);
1969
1970                     if (im->extra_flags & ALTYGRID) {
1971                         sprintf(graph_label,
1972                                 im->ygrid_scale.labfmt,
1973                                 scaledstep * (double) i, sisym);
1974                     } else {
1975                         if (MaxY < 10) {
1976                             sprintf(graph_label, "%4.1f %c",
1977                                     scaledstep * (double) i, sisym);
1978                         } else {
1979                             sprintf(graph_label, "%4.0f %c",
1980                                     scaledstep * (double) i, sisym);
1981                         }
1982                     }
1983                 }
1984                 nlabels++;
1985                 gfx_text(im,
1986                          X0 -
1987                          im->
1988                          text_prop[TEXT_PROP_AXIS].
1989                          size, Y0,
1990                          im->graph_col[GRC_FONT],
1991                          im->
1992                          text_prop[TEXT_PROP_AXIS].
1993                          font,
1994                          im->
1995                          text_prop[TEXT_PROP_AXIS].
1996                          size, im->tabwidth, 0.0,
1997                          GFX_H_RIGHT, GFX_V_CENTER, graph_label);
1998                 gfx_line(im, X0 - 2, Y0, X0, Y0,
1999                          MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2000                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2001                          MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2002                 gfx_dashed_line(im, X0 - 2, Y0,
2003                                 X1 + 2, Y0,
2004                                 MGRIDWIDTH,
2005                                 im->
2006                                 graph_col
2007                                 [GRC_MGRID],
2008                                 im->grid_dash_on, im->grid_dash_off);
2009             } else if (!(im->extra_flags & NOMINOR)) {
2010                 gfx_line(im,
2011                          X0 - 2, Y0,
2012                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2013                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2014                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2015                 gfx_dashed_line(im, X0 - 1, Y0,
2016                                 X1 + 1, Y0,
2017                                 GRIDWIDTH,
2018                                 im->
2019                                 graph_col[GRC_GRID],
2020                                 im->grid_dash_on, im->grid_dash_off);
2021             }
2022         }
2023     }
2024     return 1;
2025 }
2026
2027 /* this is frexp for base 10 */
2028 double    frexp10(
2029     double,
2030     double *);
2031 double frexp10(
2032     double x,
2033     double *e)
2034 {
2035     double    mnt;
2036     int       iexp;
2037
2038     iexp = floor(log(fabs(x)) / log(10));
2039     mnt = x / pow(10.0, iexp);
2040     if (mnt >= 10.0) {
2041         iexp++;
2042         mnt = x / pow(10.0, iexp);
2043     }
2044     *e = iexp;
2045     return mnt;
2046 }
2047
2048
2049 /* logaritmic horizontal grid */
2050 int horizontal_log_grid(
2051     image_desc_t
2052     *im)
2053 {
2054     double    yloglab[][10] = {
2055         {
2056          1.0, 10., 0.0, 0.0, 0.0, 0.0, 0.0,
2057          0.0, 0.0, 0.0}, {
2058                           1.0, 5.0, 10., 0.0, 0.0, 0.0, 0.0,
2059                           0.0, 0.0, 0.0}, {
2060                                            1.0, 2.0, 5.0, 7.0, 10., 0.0, 0.0,
2061                                            0.0, 0.0, 0.0}, {
2062                                                             1.0, 2.0, 4.0,
2063                                                             6.0, 8.0, 10.,
2064                                                             0.0,
2065                                                             0.0, 0.0, 0.0}, {
2066                                                                              1.0,
2067                                                                              2.0,
2068                                                                              3.0,
2069                                                                              4.0,
2070                                                                              5.0,
2071                                                                              6.0,
2072                                                                              7.0,
2073                                                                              8.0,
2074                                                                              9.0,
2075                                                                              10.},
2076         {
2077          0, 0, 0, 0, 0, 0, 0, 0, 0, 0}  /* last line */
2078     };
2079     int       i, j, val_exp, min_exp;
2080     double    nex;      /* number of decades in data */
2081     double    logscale; /* scale in logarithmic space */
2082     int       exfrac = 1;   /* decade spacing */
2083     int       mid = -1; /* row in yloglab for major grid */
2084     double    mspac;    /* smallest major grid spacing (pixels) */
2085     int       flab;     /* first value in yloglab to use */
2086     double    value, tmp, pre_value;
2087     double    X0, X1, Y0;
2088     char      graph_label[100];
2089
2090     nex = log10(im->maxval / im->minval);
2091     logscale = im->ysize / nex;
2092     /* major spacing for data with high dynamic range */
2093     while (logscale * exfrac < 3 * im->text_prop[TEXT_PROP_LEGEND].size) {
2094         if (exfrac == 1)
2095             exfrac = 3;
2096         else
2097             exfrac += 3;
2098     }
2099
2100     /* major spacing for less dynamic data */
2101     do {
2102         /* search best row in yloglab */
2103         mid++;
2104         for (i = 0; yloglab[mid][i + 1] < 10.0; i++);
2105         mspac = logscale * log10(10.0 / yloglab[mid][i]);
2106     }
2107     while (mspac >
2108            2 * im->text_prop[TEXT_PROP_LEGEND].size && yloglab[mid][0] > 0);
2109     if (mid)
2110         mid--;
2111     /* find first value in yloglab */
2112     for (flab = 0;
2113          yloglab[mid][flab] < 10
2114          && frexp10(im->minval, &tmp) > yloglab[mid][flab]; flab++);
2115     if (yloglab[mid][flab] == 10.0) {
2116         tmp += 1.0;
2117         flab = 0;
2118     }
2119     val_exp = tmp;
2120     if (val_exp % exfrac)
2121         val_exp += abs(-val_exp % exfrac);
2122     X0 = im->xorigin;
2123     X1 = im->xorigin + im->xsize;
2124     /* draw grid */
2125     pre_value = DNAN;
2126     while (1) {
2127
2128         value = yloglab[mid][flab] * pow(10.0, val_exp);
2129         if (AlmostEqual2sComplement(value, pre_value, 4))
2130             break;      /* it seems we are not converging */
2131         pre_value = value;
2132         Y0 = ytr(im, value);
2133         if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2134             break;
2135         /* major grid line */
2136         gfx_line(im,
2137                  X0 - 2, Y0, X0, Y0, MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2138         gfx_line(im, X1, Y0, X1 + 2, Y0,
2139                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2140         gfx_dashed_line(im, X0 - 2, Y0,
2141                         X1 + 2, Y0,
2142                         MGRIDWIDTH,
2143                         im->
2144                         graph_col
2145                         [GRC_MGRID], im->grid_dash_on, im->grid_dash_off);
2146         /* label */
2147         if (im->extra_flags & FORCE_UNITS_SI) {
2148             int       scale;
2149             double    pvalue;
2150             char      symbol;
2151
2152             scale = floor(val_exp / 3.0);
2153             if (value >= 1.0)
2154                 pvalue = pow(10.0, val_exp % 3);
2155             else
2156                 pvalue = pow(10.0, ((val_exp + 1) % 3) + 2);
2157             pvalue *= yloglab[mid][flab];
2158             if (((scale + si_symbcenter) < (int) sizeof(si_symbol))
2159                 && ((scale + si_symbcenter) >= 0))
2160                 symbol = si_symbol[scale + si_symbcenter];
2161             else
2162                 symbol = '?';
2163             sprintf(graph_label, "%3.0f %c", pvalue, symbol);
2164         } else
2165             sprintf(graph_label, "%3.0e", value);
2166         gfx_text(im,
2167                  X0 -
2168                  im->
2169                  text_prop[TEXT_PROP_AXIS].
2170                  size, Y0,
2171                  im->graph_col[GRC_FONT],
2172                  im->
2173                  text_prop[TEXT_PROP_AXIS].
2174                  font,
2175                  im->
2176                  text_prop[TEXT_PROP_AXIS].
2177                  size, im->tabwidth, 0.0,
2178                  GFX_H_RIGHT, GFX_V_CENTER, graph_label);
2179         /* minor grid */
2180         if (mid < 4 && exfrac == 1) {
2181             /* find first and last minor line behind current major line
2182              * i is the first line and j tha last */
2183             if (flab == 0) {
2184                 min_exp = val_exp - 1;
2185                 for (i = 1; yloglab[mid][i] < 10.0; i++);
2186                 i = yloglab[mid][i - 1] + 1;
2187                 j = 10;
2188             } else {
2189                 min_exp = val_exp;
2190                 i = yloglab[mid][flab - 1] + 1;
2191                 j = yloglab[mid][flab];
2192             }
2193
2194             /* draw minor lines below current major line */
2195             for (; i < j; i++) {
2196
2197                 value = i * pow(10.0, min_exp);
2198                 if (value < im->minval)
2199                     continue;
2200                 Y0 = ytr(im, value);
2201                 if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2202                     break;
2203                 /* draw lines */
2204                 gfx_line(im,
2205                          X0 - 2, Y0,
2206                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2207                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2208                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2209                 gfx_dashed_line(im, X0 - 1, Y0,
2210                                 X1 + 1, Y0,
2211                                 GRIDWIDTH,
2212                                 im->
2213                                 graph_col[GRC_GRID],
2214                                 im->grid_dash_on, im->grid_dash_off);
2215             }
2216         } else if (exfrac > 1) {
2217             for (i = val_exp - exfrac / 3 * 2; i < val_exp; i += exfrac / 3) {
2218                 value = pow(10.0, i);
2219                 if (value < im->minval)
2220                     continue;
2221                 Y0 = ytr(im, value);
2222                 if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2223                     break;
2224                 /* draw lines */
2225                 gfx_line(im,
2226                          X0 - 2, Y0,
2227                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2228                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2229                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2230                 gfx_dashed_line(im, X0 - 1, Y0,
2231                                 X1 + 1, Y0,
2232                                 GRIDWIDTH,
2233                                 im->
2234                                 graph_col[GRC_GRID],
2235                                 im->grid_dash_on, im->grid_dash_off);
2236             }
2237         }
2238
2239         /* next decade */
2240         if (yloglab[mid][++flab] == 10.0) {
2241             flab = 0;
2242             val_exp += exfrac;
2243         }
2244     }
2245
2246     /* draw minor lines after highest major line */
2247     if (mid < 4 && exfrac == 1) {
2248         /* find first and last minor line below current major line
2249          * i is the first line and j tha last */
2250         if (flab == 0) {
2251             min_exp = val_exp - 1;
2252             for (i = 1; yloglab[mid][i] < 10.0; i++);
2253             i = yloglab[mid][i - 1] + 1;
2254             j = 10;
2255         } else {
2256             min_exp = val_exp;
2257             i = yloglab[mid][flab - 1] + 1;
2258             j = yloglab[mid][flab];
2259         }
2260
2261         /* draw minor lines below current major line */
2262         for (; i < j; i++) {
2263
2264             value = i * pow(10.0, min_exp);
2265             if (value < im->minval)
2266                 continue;
2267             Y0 = ytr(im, value);
2268             if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2269                 break;
2270             /* draw lines */
2271             gfx_line(im,
2272                      X0 - 2, Y0, X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2273             gfx_line(im, X1, Y0, X1 + 2, Y0,
2274                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2275             gfx_dashed_line(im, X0 - 1, Y0,
2276                             X1 + 1, Y0,
2277                             GRIDWIDTH,
2278                             im->
2279                             graph_col[GRC_GRID],
2280                             im->grid_dash_on, im->grid_dash_off);
2281         }
2282     }
2283     /* fancy minor gridlines */
2284     else if (exfrac > 1) {
2285         for (i = val_exp - exfrac / 3 * 2; i < val_exp; i += exfrac / 3) {
2286             value = pow(10.0, i);
2287             if (value < im->minval)
2288                 continue;
2289             Y0 = ytr(im, value);
2290             if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2291                 break;
2292             /* draw lines */
2293             gfx_line(im,
2294                      X0 - 2, Y0, X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2295             gfx_line(im, X1, Y0, X1 + 2, Y0,
2296                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2297             gfx_dashed_line(im, X0 - 1, Y0,
2298                             X1 + 1, Y0,
2299                             GRIDWIDTH,
2300                             im->
2301                             graph_col[GRC_GRID],
2302                             im->grid_dash_on, im->grid_dash_off);
2303         }
2304     }
2305
2306     return 1;
2307 }
2308
2309
2310 void vertical_grid(
2311     image_desc_t *im)
2312 {
2313     int       xlab_sel; /* which sort of label and grid ? */
2314     time_t    ti, tilab, timajor;
2315     long      factor;
2316     char      graph_label[100];
2317     double    X0, Y0, Y1;   /* points for filled graph and more */
2318     struct tm tm;
2319
2320     /* the type of time grid is determined by finding
2321        the number of seconds per pixel in the graph */
2322     if (im->xlab_user.minsec == -1) {
2323         factor = (im->end - im->start) / im->xsize;
2324         xlab_sel = 0;
2325         while (xlab[xlab_sel + 1].minsec !=
2326                -1 && xlab[xlab_sel + 1].minsec <= factor) {
2327             xlab_sel++;
2328         }               /* pick the last one */
2329         while (xlab[xlab_sel - 1].minsec ==
2330                xlab[xlab_sel].minsec
2331                && xlab[xlab_sel].length > (im->end - im->start)) {
2332             xlab_sel--;
2333         }               /* go back to the smallest size */
2334         im->xlab_user.gridtm = xlab[xlab_sel].gridtm;
2335         im->xlab_user.gridst = xlab[xlab_sel].gridst;
2336         im->xlab_user.mgridtm = xlab[xlab_sel].mgridtm;
2337         im->xlab_user.mgridst = xlab[xlab_sel].mgridst;
2338         im->xlab_user.labtm = xlab[xlab_sel].labtm;
2339         im->xlab_user.labst = xlab[xlab_sel].labst;
2340         im->xlab_user.precis = xlab[xlab_sel].precis;
2341         im->xlab_user.stst = xlab[xlab_sel].stst;
2342     }
2343
2344     /* y coords are the same for every line ... */
2345     Y0 = im->yorigin;
2346     Y1 = im->yorigin - im->ysize;
2347     /* paint the minor grid */
2348     if (!(im->extra_flags & NOMINOR)) {
2349         for (ti = find_first_time(im->start,
2350                                   im->
2351                                   xlab_user.
2352                                   gridtm,
2353                                   im->
2354                                   xlab_user.
2355                                   gridst),
2356              timajor =
2357              find_first_time(im->start,
2358                              im->xlab_user.
2359                              mgridtm,
2360                              im->xlab_user.
2361                              mgridst);
2362              ti < im->end;
2363              ti =
2364              find_next_time(ti, im->xlab_user.gridtm, im->xlab_user.gridst)
2365             ) {
2366             /* are we inside the graph ? */
2367             if (ti < im->start || ti > im->end)
2368                 continue;
2369             while (timajor < ti) {
2370                 timajor = find_next_time(timajor,
2371                                          im->
2372                                          xlab_user.
2373                                          mgridtm, im->xlab_user.mgridst);
2374             }
2375             if (ti == timajor)
2376                 continue;   /* skip as falls on major grid line */
2377             X0 = xtr(im, ti);
2378             gfx_line(im, X0, Y1 - 2, X0, Y1,
2379                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2380             gfx_line(im, X0, Y0, X0, Y0 + 2,
2381                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2382             gfx_dashed_line(im, X0, Y0 + 1, X0,
2383                             Y1 - 1, GRIDWIDTH,
2384                             im->
2385                             graph_col[GRC_GRID],
2386                             im->grid_dash_on, im->grid_dash_off);
2387         }
2388     }
2389
2390     /* paint the major grid */
2391     for (ti = find_first_time(im->start,
2392                               im->
2393                               xlab_user.
2394                               mgridtm,
2395                               im->
2396                               xlab_user.
2397                               mgridst);
2398          ti < im->end;
2399          ti = find_next_time(ti, im->xlab_user.mgridtm, im->xlab_user.mgridst)
2400         ) {
2401         /* are we inside the graph ? */
2402         if (ti < im->start || ti > im->end)
2403             continue;
2404         X0 = xtr(im, ti);
2405         gfx_line(im, X0, Y1 - 2, X0, Y1,
2406                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2407         gfx_line(im, X0, Y0, X0, Y0 + 3,
2408                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2409         gfx_dashed_line(im, X0, Y0 + 3, X0,
2410                         Y1 - 2, MGRIDWIDTH,
2411                         im->
2412                         graph_col
2413                         [GRC_MGRID], im->grid_dash_on, im->grid_dash_off);
2414     }
2415     /* paint the labels below the graph */
2416     for (ti =
2417          find_first_time(im->start -
2418                          im->xlab_user.
2419                          precis / 2,
2420                          im->xlab_user.
2421                          labtm,
2422                          im->xlab_user.
2423                          labst);
2424          ti <=
2425          im->end -
2426          im->xlab_user.precis / 2;
2427          ti = find_next_time(ti, im->xlab_user.labtm, im->xlab_user.labst)
2428         ) {
2429         tilab = ti + im->xlab_user.precis / 2;  /* correct time for the label */
2430         /* are we inside the graph ? */
2431         if (tilab < im->start || tilab > im->end)
2432             continue;
2433 #if HAVE_STRFTIME
2434         localtime_r(&tilab, &tm);
2435         strftime(graph_label, 99, im->xlab_user.stst, &tm);
2436 #else
2437 # error "your libc has no strftime I guess we'll abort the exercise here."
2438 #endif
2439         gfx_text(im,
2440                  xtr(im, tilab),
2441                  Y0 + 3,
2442                  im->graph_col[GRC_FONT],
2443                  im->
2444                  text_prop[TEXT_PROP_AXIS].
2445                  font,
2446                  im->
2447                  text_prop[TEXT_PROP_AXIS].
2448                  size, im->tabwidth, 0.0,
2449                  GFX_H_CENTER, GFX_V_TOP, graph_label);
2450     }
2451
2452 }
2453
2454
2455 void axis_paint(
2456     image_desc_t *im)
2457 {
2458     /* draw x and y axis */
2459     /* gfx_line ( im->canvas, im->xorigin+im->xsize,im->yorigin,
2460        im->xorigin+im->xsize,im->yorigin-im->ysize,
2461        GRIDWIDTH, im->graph_col[GRC_AXIS]);
2462
2463        gfx_line ( im->canvas, im->xorigin,im->yorigin-im->ysize,
2464        im->xorigin+im->xsize,im->yorigin-im->ysize,
2465        GRIDWIDTH, im->graph_col[GRC_AXIS]); */
2466
2467     gfx_line(im, im->xorigin - 4,
2468              im->yorigin,
2469              im->xorigin + im->xsize +
2470              4, im->yorigin, MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2471     gfx_line(im, im->xorigin,
2472              im->yorigin + 4,
2473              im->xorigin,
2474              im->yorigin - im->ysize -
2475              4, MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2476     /* arrow for X and Y axis direction */
2477     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 */
2478                  im->graph_col[GRC_ARROW]);
2479     gfx_close_path(im);
2480     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 */
2481                  im->graph_col[GRC_ARROW]);
2482     gfx_close_path(im);
2483 }
2484
2485 void grid_paint(
2486     image_desc_t *im)
2487 {
2488     long      i;
2489     int       res = 0;
2490     double    X0, Y0;   /* points for filled graph and more */
2491     struct gfx_color_t water_color;
2492
2493     /* draw 3d border */
2494     gfx_new_area(im, 0, im->yimg,
2495                  2, im->yimg - 2, 2, 2, im->graph_col[GRC_SHADEA]);
2496     gfx_add_point(im, im->ximg - 2, 2);
2497     gfx_add_point(im, im->ximg, 0);
2498     gfx_add_point(im, 0, 0);
2499     gfx_close_path(im);
2500     gfx_new_area(im, 2, im->yimg - 2,
2501                  im->ximg - 2,
2502                  im->yimg - 2, im->ximg - 2, 2, im->graph_col[GRC_SHADEB]);
2503     gfx_add_point(im, im->ximg, 0);
2504     gfx_add_point(im, im->ximg, im->yimg);
2505     gfx_add_point(im, 0, im->yimg);
2506     gfx_close_path(im);
2507     if (im->draw_x_grid == 1)
2508         vertical_grid(im);
2509     if (im->draw_y_grid == 1) {
2510         if (im->logarithmic) {
2511             res = horizontal_log_grid(im);
2512         } else {
2513             res = draw_horizontal_grid(im);
2514         }
2515
2516         /* dont draw horizontal grid if there is no min and max val */
2517         if (!res) {
2518             char     *nodata = "No Data found";
2519
2520             gfx_text(im, im->ximg / 2,
2521                      (2 * im->yorigin -
2522                       im->ysize) / 2,
2523                      im->graph_col[GRC_FONT],
2524                      im->
2525                      text_prop[TEXT_PROP_AXIS].
2526                      font,
2527                      im->
2528                      text_prop[TEXT_PROP_AXIS].
2529                      size, im->tabwidth, 0.0,
2530                      GFX_H_CENTER, GFX_V_CENTER, nodata);
2531         }
2532     }
2533
2534     /* yaxis unit description */
2535     gfx_text(im,
2536              10,
2537              (im->yorigin -
2538               im->ysize / 2),
2539              im->graph_col[GRC_FONT],
2540              im->
2541              text_prop[TEXT_PROP_UNIT].
2542              font,
2543              im->
2544              text_prop[TEXT_PROP_UNIT].
2545              size, im->tabwidth,
2546              RRDGRAPH_YLEGEND_ANGLE, GFX_H_CENTER, GFX_V_CENTER, im->ylegend);
2547     /* graph title */
2548     gfx_text(im,
2549              im->ximg / 2, 6,
2550              im->graph_col[GRC_FONT],
2551              im->
2552              text_prop[TEXT_PROP_TITLE].
2553              font,
2554              im->
2555              text_prop[TEXT_PROP_TITLE].
2556              size, im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_TOP, im->title);
2557     /* rrdtool 'logo' */
2558     water_color = im->graph_col[GRC_FONT];
2559     water_color.alpha = 0.3;
2560     gfx_text(im, im->ximg - 4, 5,
2561              water_color,
2562              im->
2563              text_prop[TEXT_PROP_AXIS].
2564              font, 5.5, im->tabwidth,
2565              -90, GFX_H_LEFT, GFX_V_TOP, "RRDTOOL / TOBI OETIKER");
2566     /* graph watermark */
2567     if (im->watermark[0] != '\0') {
2568         gfx_text(im,
2569                  im->ximg / 2, im->yimg - 6,
2570                  water_color,
2571                  im->
2572                  text_prop[TEXT_PROP_AXIS].
2573                  font, 5.5, im->tabwidth, 0,
2574                  GFX_H_CENTER, GFX_V_BOTTOM, im->watermark);
2575     }
2576
2577     /* graph labels */
2578     if (!(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH)) {
2579         for (i = 0; i < im->gdes_c; i++) {
2580             if (im->gdes[i].legend[0] == '\0')
2581                 continue;
2582             /* im->gdes[i].leg_y is the bottom of the legend */
2583             X0 = im->gdes[i].leg_x;
2584             Y0 = im->gdes[i].leg_y;
2585             gfx_text(im, X0, Y0,
2586                      im->graph_col[GRC_FONT],
2587                      im->
2588                      text_prop
2589                      [TEXT_PROP_LEGEND].font,
2590                      im->
2591                      text_prop
2592                      [TEXT_PROP_LEGEND].size,
2593                      im->tabwidth, 0.0,
2594                      GFX_H_LEFT, GFX_V_BOTTOM, im->gdes[i].legend);
2595             /* The legend for GRAPH items starts with "M " to have
2596                enough space for the box */
2597             if (im->gdes[i].gf != GF_PRINT &&
2598                 im->gdes[i].gf != GF_GPRINT && im->gdes[i].gf != GF_COMMENT) {
2599                 double    boxH, boxV;
2600                 double    X1, Y1;
2601
2602                 boxH = gfx_get_text_width(im, 0,
2603                                           im->
2604                                           text_prop
2605                                           [TEXT_PROP_LEGEND].
2606                                           font,
2607                                           im->
2608                                           text_prop
2609                                           [TEXT_PROP_LEGEND].
2610                                           size, im->tabwidth, "o") * 1.2;
2611                 boxV = boxH;
2612                 /* shift the box up a bit */
2613                 Y0 -= boxV * 0.4;
2614                 /* make sure transparent colors show up the same way as in the graph */
2615                 gfx_new_area(im,
2616                              X0, Y0 - boxV,
2617                              X0, Y0, X0 + boxH, Y0, im->graph_col[GRC_BACK]);
2618                 gfx_add_point(im, X0 + boxH, Y0 - boxV);
2619                 gfx_close_path(im);
2620                 gfx_new_area(im, X0, Y0 - boxV, X0,
2621                              Y0, X0 + boxH, Y0, im->gdes[i].col);
2622                 gfx_add_point(im, X0 + boxH, Y0 - boxV);
2623                 gfx_close_path(im);
2624                 cairo_save(im->cr);
2625                 cairo_new_path(im->cr);
2626                 cairo_set_line_width(im->cr, 1.0);
2627                 X1 = X0 + boxH;
2628                 Y1 = Y0 - boxV;
2629                 gfx_line_fit(im, &X0, &Y0);
2630                 gfx_line_fit(im, &X1, &Y1);
2631                 cairo_move_to(im->cr, X0, Y0);
2632                 cairo_line_to(im->cr, X1, Y0);
2633                 cairo_line_to(im->cr, X1, Y1);
2634                 cairo_line_to(im->cr, X0, Y1);
2635                 cairo_close_path(im->cr);
2636                 cairo_set_source_rgba(im->cr,
2637                                       im->
2638                                       graph_col
2639                                       [GRC_FRAME].
2640                                       red,
2641                                       im->
2642                                       graph_col
2643                                       [GRC_FRAME].
2644                                       green,
2645                                       im->
2646                                       graph_col
2647                                       [GRC_FRAME].
2648                                       blue, im->graph_col[GRC_FRAME].alpha);
2649                 if (im->gdes[i].dash) {
2650                     /* make box borders in legend dashed if the graph is dashed */
2651                     double    dashes[] = {
2652                         3.0
2653                     };
2654                     cairo_set_dash(im->cr, dashes, 1, 0.0);
2655                 }
2656                 cairo_stroke(im->cr);
2657                 cairo_restore(im->cr);
2658             }
2659         }
2660     }
2661 }
2662
2663
2664 /*****************************************************
2665  * lazy check make sure we rely need to create this graph
2666  *****************************************************/
2667
2668 int lazy_check(
2669     image_desc_t *im)
2670 {
2671     FILE     *fd = NULL;
2672     int       size = 1;
2673     struct stat imgstat;
2674
2675     if (im->lazy == 0)
2676         return 0;       /* no lazy option */
2677     if (strlen(im->graphfile) == 0)
2678         return 0;       /* inmemory option */
2679     if (stat(im->graphfile, &imgstat) != 0)
2680         return 0;       /* can't stat */
2681     /* one pixel in the existing graph is more then what we would
2682        change here ... */
2683     if (time(NULL) - imgstat.st_mtime > (im->end - im->start) / im->xsize)
2684         return 0;
2685     if ((fd = fopen(im->graphfile, "rb")) == NULL)
2686         return 0;       /* the file does not exist */
2687     switch (im->imgformat) {
2688     case IF_PNG:
2689         size = PngSize(fd, &(im->ximg), &(im->yimg));
2690         break;
2691     default:
2692         size = 1;
2693     }
2694     fclose(fd);
2695     return size;
2696 }
2697
2698
2699 int graph_size_location(
2700     image_desc_t
2701     *im,
2702     int elements)
2703 {
2704     /* The actual size of the image to draw is determined from
2705      ** several sources.  The size given on the command line is
2706      ** the graph area but we need more as we have to draw labels
2707      ** and other things outside the graph area
2708      */
2709
2710     int       Xvertical = 0, Ytitle =
2711         0, Xylabel = 0, Xmain = 0, Ymain =
2712         0, Yxlabel = 0, Xspacing = 15, Yspacing = 15, Ywatermark = 4;
2713
2714     if (im->extra_flags & ONLY_GRAPH) {
2715         im->xorigin = 0;
2716         im->ximg = im->xsize;
2717         im->yimg = im->ysize;
2718         im->yorigin = im->ysize;
2719         ytr(im, DNAN);
2720         return 0;
2721     }
2722
2723     /** +---+--------------------------------------------+
2724      ** | y |...............graph title..................|
2725      ** |   +---+-------------------------------+--------+
2726      ** | a | y |                               |        |
2727      ** | x |   |                               |        |
2728      ** | i | a |                               |  pie   |
2729      ** | s | x |       main graph area         | chart  |
2730      ** |   | i |                               |  area  |
2731      ** | t | s |                               |        |
2732      ** | i |   |                               |        |
2733      ** | t | l |                               |        |
2734      ** | l | b +-------------------------------+--------+
2735      ** | e | l |       x axis labels           |        |
2736      ** +---+---+-------------------------------+--------+
2737      ** |....................legends.....................|
2738      ** +------------------------------------------------+
2739      ** |                   watermark                    |
2740      ** +------------------------------------------------+
2741      */
2742
2743     if (im->ylegend[0] != '\0') {
2744         Xvertical = im->text_prop[TEXT_PROP_UNIT].size * 2;
2745     }
2746
2747     if (im->title[0] != '\0') {
2748         /* The title is placed "inbetween" two text lines so it
2749          ** automatically has some vertical spacing.  The horizontal
2750          ** spacing is added here, on each side.
2751          */
2752         /* if necessary, reduce the font size of the title until it fits the image width */
2753         Ytitle = im->text_prop[TEXT_PROP_TITLE].size * 2.6 + 10;
2754     }
2755
2756     if (elements) {
2757         if (im->draw_x_grid) {
2758             Yxlabel = im->text_prop[TEXT_PROP_AXIS].size * 2.5;
2759         }
2760         if (im->draw_y_grid || im->forceleftspace) {
2761             Xylabel =
2762                 gfx_get_text_width(im, 0,
2763                                    im->
2764                                    text_prop
2765                                    [TEXT_PROP_AXIS].
2766                                    font,
2767                                    im->
2768                                    text_prop
2769                                    [TEXT_PROP_AXIS].
2770                                    size, im->tabwidth, "0") * im->unitslength;
2771         }
2772     }
2773
2774     if (im->extra_flags & FULL_SIZE_MODE) {
2775         /* The actual size of the image to draw has been determined by the user.
2776          ** The graph area is the space remaining after accounting for the legend,
2777          ** the watermark, the pie chart, the axis labels, and the title.
2778          */
2779         im->xorigin = 0;
2780         im->ximg = im->xsize;
2781         im->yimg = im->ysize;
2782         im->yorigin = im->ysize;
2783         Xmain = im->ximg;
2784         Ymain = im->yimg;
2785         im->yorigin += Ytitle;
2786         /* Now calculate the total size.  Insert some spacing where
2787            desired.  im->xorigin and im->yorigin need to correspond
2788            with the lower left corner of the main graph area or, if
2789            this one is not set, the imaginary box surrounding the
2790            pie chart area. */
2791         /* Initial size calculation for the main graph area */
2792         Xmain = im->ximg - (Xylabel + 2 * Xspacing);
2793         if (Xmain)
2794             Xmain -= Xspacing;  /* put space between main graph area and right edge */
2795         im->xorigin = Xspacing + Xylabel;
2796         /* the length of the title should not influence with width of the graph
2797            if (Xtitle > im->ximg) im->ximg = Xtitle; */
2798         if (Xvertical) {    /* unit description */
2799             Xmain -= Xvertical;
2800             im->xorigin += Xvertical;
2801         }
2802         im->xsize = Xmain;
2803         xtr(im, 0);
2804         /* The vertical size of the image is known in advance.  The main graph area
2805          ** (Ymain) and im->yorigin must be set according to the space requirements
2806          ** of the legend and the axis labels.
2807          */
2808         if (im->extra_flags & NOLEGEND) {
2809             /* set dimensions correctly if using full size mode with no legend */
2810             im->yorigin =
2811                 im->yimg -
2812                 im->text_prop[TEXT_PROP_AXIS].size * 2.5 - Yspacing;
2813             Ymain = im->yorigin;
2814         } else {
2815             /* Determine where to place the legends onto the image.
2816              ** Set Ymain and adjust im->yorigin to match the space requirements.
2817              */
2818             if (leg_place(im, &Ymain) == -1)
2819                 return -1;
2820         }
2821
2822
2823         /* remove title space *or* some padding above the graph from the main graph area */
2824         if (Ytitle) {
2825             Ymain -= Ytitle;
2826         } else {
2827             Ymain -= 1.5 * Yspacing;
2828         }
2829
2830         /* watermark doesn't seem to effect the vertical size of the main graph area, oh well! */
2831         if (im->watermark[0] != '\0') {
2832             Ymain -= Ywatermark;
2833         }
2834
2835         im->ysize = Ymain;
2836     } else {            /* dimension options -width and -height refer to the dimensions of the main graph area */
2837
2838         /* The actual size of the image to draw is determined from
2839          ** several sources.  The size given on the command line is
2840          ** the graph area but we need more as we have to draw labels
2841          ** and other things outside the graph area.
2842          */
2843
2844         if (im->ylegend[0] != '\0') {
2845             Xvertical = im->text_prop[TEXT_PROP_UNIT].size * 2;
2846         }
2847
2848
2849         if (im->title[0] != '\0') {
2850             /* The title is placed "inbetween" two text lines so it
2851              ** automatically has some vertical spacing.  The horizontal
2852              ** spacing is added here, on each side.
2853              */
2854             /* don't care for the with of the title
2855                Xtitle = gfx_get_text_width(im->canvas, 0,
2856                im->text_prop[TEXT_PROP_TITLE].font,
2857                im->text_prop[TEXT_PROP_TITLE].size,
2858                im->tabwidth,
2859                im->title, 0) + 2*Xspacing; */
2860             Ytitle = im->text_prop[TEXT_PROP_TITLE].size * 2.6 + 10;
2861         }
2862
2863         if (elements) {
2864             Xmain = im->xsize;
2865             Ymain = im->ysize;
2866         }
2867         /* Now calculate the total size.  Insert some spacing where
2868            desired.  im->xorigin and im->yorigin need to correspond
2869            with the lower left corner of the main graph area or, if
2870            this one is not set, the imaginary box surrounding the
2871            pie chart area. */
2872
2873         /* The legend width cannot yet be determined, as a result we
2874          ** have problems adjusting the image to it.  For now, we just
2875          ** forget about it at all; the legend will have to fit in the
2876          ** size already allocated.
2877          */
2878         im->ximg = Xylabel + Xmain + 2 * Xspacing;
2879         if (Xmain)
2880             im->ximg += Xspacing;
2881         im->xorigin = Xspacing + Xylabel;
2882         /* the length of the title should not influence with width of the graph
2883            if (Xtitle > im->ximg) im->ximg = Xtitle; */
2884         if (Xvertical) {    /* unit description */
2885             im->ximg += Xvertical;
2886             im->xorigin += Xvertical;
2887         }
2888         xtr(im, 0);
2889         /* The vertical size is interesting... we need to compare
2890          ** the sum of {Ytitle, Ymain, Yxlabel, Ylegend, Ywatermark} with
2891          ** Yvertical however we need to know {Ytitle+Ymain+Yxlabel}
2892          ** in order to start even thinking about Ylegend or Ywatermark.
2893          **
2894          ** Do it in three portions: First calculate the inner part,
2895          ** then do the legend, then adjust the total height of the img,
2896          ** adding space for a watermark if one exists;
2897          */
2898         /* reserve space for main and/or pie */
2899         im->yimg = Ymain + Yxlabel;
2900         im->yorigin = im->yimg - Yxlabel;
2901         /* reserve space for the title *or* some padding above the graph */
2902         if (Ytitle) {
2903             im->yimg += Ytitle;
2904             im->yorigin += Ytitle;
2905         } else {
2906             im->yimg += 1.5 * Yspacing;
2907             im->yorigin += 1.5 * Yspacing;
2908         }
2909         /* reserve space for padding below the graph */
2910         im->yimg += Yspacing;
2911         /* Determine where to place the legends onto the image.
2912          ** Adjust im->yimg to match the space requirements.
2913          */
2914         if (leg_place(im, 0) == -1)
2915             return -1;
2916         if (im->watermark[0] != '\0') {
2917             im->yimg += Ywatermark;
2918         }
2919     }
2920
2921     ytr(im, DNAN);
2922     return 0;
2923 }
2924
2925 static cairo_status_t cairo_output(
2926     void *closure,
2927     const unsigned char
2928     *data,
2929     unsigned int length)
2930 {
2931     image_desc_t *im = closure;
2932
2933     im->rendered_image =
2934         realloc(im->rendered_image, im->rendered_image_size + length);
2935     if (im->rendered_image == NULL)
2936         return CAIRO_STATUS_WRITE_ERROR;
2937     memcpy(im->rendered_image + im->rendered_image_size, data, length);
2938     im->rendered_image_size += length;
2939     return CAIRO_STATUS_SUCCESS;
2940 }
2941
2942 /* draw that picture thing ... */
2943 int graph_paint(
2944     image_desc_t *im)
2945 {
2946     int       i, ii;
2947     int       lazy = lazy_check(im);
2948     double    areazero = 0.0;
2949     graph_desc_t *lastgdes = NULL;
2950     rrd_infoval_t info;
2951     PangoFontMap *font_map = pango_cairo_font_map_get_default();
2952
2953     /* if we are lazy and there is nothing to PRINT ... quit now */
2954     if (lazy && im->prt_c == 0) {
2955         info.u_cnt = im->ximg;
2956         grinfo_push(im, sprintf_alloc("image_width"), RD_I_CNT, info);
2957         info.u_cnt = im->yimg;
2958         grinfo_push(im, sprintf_alloc("image_height"), RD_I_CNT, info);
2959         return 0;
2960     }
2961     /* pull the data from the rrd files ... */
2962     if (data_fetch(im) == -1)
2963         return -1;
2964     /* evaluate VDEF and CDEF operations ... */
2965     if (data_calc(im) == -1)
2966         return -1;
2967     /* calculate and PRINT and GPRINT definitions. We have to do it at
2968      * this point because it will affect the length of the legends
2969      * if there are no graph elements (i==0) we stop here ...
2970      * if we are lazy, try to quit ...
2971      */
2972     i = print_calc(im);
2973     if (i < 0)
2974         return -1;
2975
2976     if ((i == 0) || lazy)
2977         return 0;
2978
2979 /**************************************************************
2980  *** Calculating sizes and locations became a bit confusing ***
2981  *** so I moved this into a separate function.              ***
2982  **************************************************************/
2983     if (graph_size_location(im, i) == -1)
2984         return -1;
2985
2986     info.u_cnt = im->xorigin;
2987     grinfo_push(im, sprintf_alloc("graph_left"), RD_I_CNT, info);
2988     info.u_cnt = im->yorigin - im->ysize;
2989     grinfo_push(im, sprintf_alloc("graph_top"), RD_I_CNT, info);
2990     info.u_cnt = im->xsize;
2991     grinfo_push(im, sprintf_alloc("graph_width"), RD_I_CNT, info);
2992     info.u_cnt = im->ysize;
2993     grinfo_push(im, sprintf_alloc("graph_height"), RD_I_CNT, info);
2994     info.u_cnt = im->ximg;
2995     grinfo_push(im, sprintf_alloc("image_width"), RD_I_CNT, info);
2996     info.u_cnt = im->yimg;
2997     grinfo_push(im, sprintf_alloc("image_height"), RD_I_CNT, info);
2998
2999     /* get actual drawing data and find min and max values */
3000     if (data_proc(im) == -1)
3001         return -1;
3002     if (!im->logarithmic) {
3003         si_unit(im);
3004     }
3005
3006     /* identify si magnitude Kilo, Mega Giga ? */
3007     if (!im->rigid && !im->logarithmic)
3008         expand_range(im);   /* make sure the upper and lower limit are
3009                                sensible values */
3010
3011     info.u_val = im->minval;
3012     grinfo_push(im, sprintf_alloc("value_min"), RD_I_VAL, info);
3013     info.u_val = im->maxval;
3014     grinfo_push(im, sprintf_alloc("value_max"), RD_I_VAL, info);
3015
3016     if (!calc_horizontal_grid(im))
3017         return -1;
3018     /* reset precalc */
3019     ytr(im, DNAN);
3020 /*   if (im->gridfit)
3021      apply_gridfit(im); */
3022     /* the actual graph is created by going through the individual
3023        graph elements and then drawing them */
3024     cairo_surface_destroy(im->surface);
3025     switch (im->imgformat) {
3026     case IF_PNG:
3027         im->surface =
3028             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
3029                                        im->ximg * im->zoom,
3030                                        im->yimg * im->zoom);
3031         break;
3032     case IF_PDF:
3033         im->gridfit = 0;
3034         im->surface = strlen(im->graphfile)
3035             ? cairo_pdf_surface_create(im->graphfile, im->ximg * im->zoom,
3036                                        im->yimg * im->zoom)
3037             : cairo_pdf_surface_create_for_stream
3038             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3039         break;
3040     case IF_EPS:
3041         im->gridfit = 0;
3042         im->surface = strlen(im->graphfile)
3043             ?
3044             cairo_ps_surface_create(im->graphfile, im->ximg * im->zoom,
3045                                     im->yimg * im->zoom)
3046             : cairo_ps_surface_create_for_stream
3047             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3048         break;
3049     case IF_SVG:
3050         im->gridfit = 0;
3051         im->surface = strlen(im->graphfile)
3052             ?
3053             cairo_svg_surface_create(im->
3054                                      graphfile,
3055                                      im->ximg * im->zoom, im->yimg * im->zoom)
3056             : cairo_svg_surface_create_for_stream
3057             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3058         cairo_svg_surface_restrict_to_version
3059             (im->surface, CAIRO_SVG_VERSION_1_1);
3060         break;
3061     };
3062     im->cr = cairo_create(im->surface);
3063     cairo_set_antialias(im->cr, im->graph_antialias);
3064     cairo_scale(im->cr, im->zoom, im->zoom);
3065     pango_cairo_font_map_set_resolution(PANGO_CAIRO_FONT_MAP(font_map), 100);
3066     gfx_new_area(im, 0, 0, 0, im->yimg,
3067                  im->ximg, im->yimg, im->graph_col[GRC_BACK]);
3068     gfx_add_point(im, im->ximg, 0);
3069     gfx_close_path(im);
3070     gfx_new_area(im, im->xorigin,
3071                  im->yorigin,
3072                  im->xorigin +
3073                  im->xsize, im->yorigin,
3074                  im->xorigin +
3075                  im->xsize,
3076                  im->yorigin - im->ysize, im->graph_col[GRC_CANVAS]);
3077     gfx_add_point(im, im->xorigin, im->yorigin - im->ysize);
3078     gfx_close_path(im);
3079     cairo_rectangle(im->cr, im->xorigin, im->yorigin - im->ysize - 1.0,
3080                     im->xsize, im->ysize + 2.0);
3081     cairo_clip(im->cr);
3082     if (im->minval > 0.0)
3083         areazero = im->minval;
3084     if (im->maxval < 0.0)
3085         areazero = im->maxval;
3086     for (i = 0; i < im->gdes_c; i++) {
3087         switch (im->gdes[i].gf) {
3088         case GF_CDEF:
3089         case GF_VDEF:
3090         case GF_DEF:
3091         case GF_PRINT:
3092         case GF_GPRINT:
3093         case GF_COMMENT:
3094         case GF_TEXTALIGN:
3095         case GF_HRULE:
3096         case GF_VRULE:
3097         case GF_XPORT:
3098         case GF_SHIFT:
3099             break;
3100         case GF_TICK:
3101             for (ii = 0; ii < im->xsize; ii++) {
3102                 if (!isnan(im->gdes[i].p_data[ii])
3103                     && im->gdes[i].p_data[ii] != 0.0) {
3104                     if (im->gdes[i].yrule > 0) {
3105                         gfx_line(im,
3106                                  im->xorigin + ii,
3107                                  im->yorigin,
3108                                  im->xorigin + ii,
3109                                  im->yorigin -
3110                                  im->gdes[i].yrule *
3111                                  im->ysize, 1.0, im->gdes[i].col);
3112                     } else if (im->gdes[i].yrule < 0) {
3113                         gfx_line(im,
3114                                  im->xorigin + ii,
3115                                  im->yorigin - im->ysize,
3116                                  im->xorigin + ii,
3117                                  im->yorigin - (1 -
3118                                                 im->gdes[i].
3119                                                 yrule) *
3120                                  im->ysize, 1.0, im->gdes[i].col);
3121                     }
3122                 }
3123             }
3124             break;
3125         case GF_LINE:
3126         case GF_AREA:
3127             /* fix data points at oo and -oo */
3128             for (ii = 0; ii < im->xsize; ii++) {
3129                 if (isinf(im->gdes[i].p_data[ii])) {
3130                     if (im->gdes[i].p_data[ii] > 0) {
3131                         im->gdes[i].p_data[ii] = im->maxval;
3132                     } else {
3133                         im->gdes[i].p_data[ii] = im->minval;
3134                     }
3135
3136                 }
3137             }           /* for */
3138
3139             /* *******************************************************
3140                a           ___. (a,t)
3141                |   |    ___
3142                ____|   |   |   |
3143                |       |___|
3144                -------|--t-1--t--------------------------------
3145
3146                if we know the value at time t was a then
3147                we draw a square from t-1 to t with the value a.
3148
3149                ********************************************************* */
3150             if (im->gdes[i].col.alpha != 0.0) {
3151                 /* GF_LINE and friend */
3152                 if (im->gdes[i].gf == GF_LINE) {
3153                     double    last_y = 0.0;
3154                     int       draw_on = 0;
3155
3156                     cairo_save(im->cr);
3157                     cairo_new_path(im->cr);
3158                     cairo_set_line_width(im->cr, im->gdes[i].linewidth);
3159                     if (im->gdes[i].dash) {
3160                         cairo_set_dash(im->cr,
3161                                        im->gdes[i].p_dashes,
3162                                        im->gdes[i].ndash, im->gdes[i].offset);
3163                     }
3164
3165                     for (ii = 1; ii < im->xsize; ii++) {
3166                         if (isnan(im->gdes[i].p_data[ii])
3167                             || (im->slopemode == 1
3168                                 && isnan(im->gdes[i].p_data[ii - 1]))) {
3169                             draw_on = 0;
3170                             continue;
3171                         }
3172                         if (draw_on == 0) {
3173                             last_y = ytr(im, im->gdes[i].p_data[ii]);
3174                             if (im->slopemode == 0) {
3175                                 double    x = ii - 1 + im->xorigin;
3176                                 double    y = last_y;
3177
3178                                 gfx_line_fit(im, &x, &y);
3179                                 cairo_move_to(im->cr, x, y);
3180                                 x = ii + im->xorigin;
3181                                 y = last_y;
3182                                 gfx_line_fit(im, &x, &y);
3183                                 cairo_line_to(im->cr, x, y);
3184                             } else {
3185                                 double    x = ii - 1 + im->xorigin;
3186                                 double    y =
3187                                     ytr(im, im->gdes[i].p_data[ii - 1]);
3188                                 gfx_line_fit(im, &x, &y);
3189                                 cairo_move_to(im->cr, x, y);
3190                                 x = ii + im->xorigin;
3191                                 y = last_y;
3192                                 gfx_line_fit(im, &x, &y);
3193                                 cairo_line_to(im->cr, x, y);
3194                             }
3195                             draw_on = 1;
3196                         } else {
3197                             double    x1 = ii + im->xorigin;
3198                             double    y1 = ytr(im, im->gdes[i].p_data[ii]);
3199
3200                             if (im->slopemode == 0
3201                                 && !AlmostEqual2sComplement(y1, last_y, 4)) {
3202                                 double    x = ii - 1 + im->xorigin;
3203                                 double    y = y1;
3204
3205                                 gfx_line_fit(im, &x, &y);
3206                                 cairo_line_to(im->cr, x, y);
3207                             };
3208                             last_y = y1;
3209                             gfx_line_fit(im, &x1, &y1);
3210                             cairo_line_to(im->cr, x1, y1);
3211                         };
3212                     }
3213                     cairo_set_source_rgba(im->cr,
3214                                           im->gdes[i].
3215                                           col.red,
3216                                           im->gdes[i].
3217                                           col.green,
3218                                           im->gdes[i].
3219                                           col.blue, im->gdes[i].col.alpha);
3220                     cairo_set_line_cap(im->cr, CAIRO_LINE_CAP_ROUND);
3221                     cairo_set_line_join(im->cr, CAIRO_LINE_JOIN_ROUND);
3222                     cairo_stroke(im->cr);
3223                     cairo_restore(im->cr);
3224                 } else {
3225                     int       idxI = -1;
3226                     double   *foreY =
3227                         (double *) malloc(sizeof(double) * im->xsize * 2);
3228                     double   *foreX =
3229                         (double *) malloc(sizeof(double) * im->xsize * 2);
3230                     double   *backY =
3231                         (double *) malloc(sizeof(double) * im->xsize * 2);
3232                     double   *backX =
3233                         (double *) malloc(sizeof(double) * im->xsize * 2);
3234                     int       drawem = 0;
3235
3236                     for (ii = 0; ii <= im->xsize; ii++) {
3237                         double    ybase, ytop;
3238
3239                         if (idxI > 0 && (drawem != 0 || ii == im->xsize)) {
3240                             int       cntI = 1;
3241                             int       lastI = 0;
3242
3243                             while (cntI < idxI
3244                                    &&
3245                                    AlmostEqual2sComplement(foreY
3246                                                            [lastI],
3247                                                            foreY[cntI], 4)
3248                                    &&
3249                                    AlmostEqual2sComplement(foreY
3250                                                            [lastI],
3251                                                            foreY
3252                                                            [cntI + 1], 4)) {
3253                                 cntI++;
3254                             }
3255                             gfx_new_area(im,
3256                                          backX[0], backY[0],
3257                                          foreX[0], foreY[0],
3258                                          foreX[cntI],
3259                                          foreY[cntI], im->gdes[i].col);
3260                             while (cntI < idxI) {
3261                                 lastI = cntI;
3262                                 cntI++;
3263                                 while (cntI < idxI
3264                                        &&
3265                                        AlmostEqual2sComplement(foreY
3266                                                                [lastI],
3267                                                                foreY[cntI], 4)
3268                                        &&
3269                                        AlmostEqual2sComplement(foreY
3270                                                                [lastI],
3271                                                                foreY
3272                                                                [cntI
3273                                                                 + 1], 4)) {
3274                                     cntI++;
3275                                 }
3276                                 gfx_add_point(im, foreX[cntI], foreY[cntI]);
3277                             }
3278                             gfx_add_point(im, backX[idxI], backY[idxI]);
3279                             while (idxI > 1) {
3280                                 lastI = idxI;
3281                                 idxI--;
3282                                 while (idxI > 1
3283                                        &&
3284                                        AlmostEqual2sComplement(backY
3285                                                                [lastI],
3286                                                                backY[idxI], 4)
3287                                        &&
3288                                        AlmostEqual2sComplement(backY
3289                                                                [lastI],
3290                                                                backY
3291                                                                [idxI
3292                                                                 - 1], 4)) {
3293                                     idxI--;
3294                                 }
3295                                 gfx_add_point(im, backX[idxI], backY[idxI]);
3296                             }
3297                             idxI = -1;
3298                             drawem = 0;
3299                             gfx_close_path(im);
3300                         }
3301                         if (drawem != 0) {
3302                             drawem = 0;
3303                             idxI = -1;
3304                         }
3305                         if (ii == im->xsize)
3306                             break;
3307                         if (im->slopemode == 0 && ii == 0) {
3308                             continue;
3309                         }
3310                         if (isnan(im->gdes[i].p_data[ii])) {
3311                             drawem = 1;
3312                             continue;
3313                         }
3314                         ytop = ytr(im, im->gdes[i].p_data[ii]);
3315                         if (lastgdes && im->gdes[i].stack) {
3316                             ybase = ytr(im, lastgdes->p_data[ii]);
3317                         } else {
3318                             ybase = ytr(im, areazero);
3319                         }
3320                         if (ybase == ytop) {
3321                             drawem = 1;
3322                             continue;
3323                         }
3324
3325                         if (ybase > ytop) {
3326                             double    extra = ytop;
3327
3328                             ytop = ybase;
3329                             ybase = extra;
3330                         }
3331                         if (im->slopemode == 0) {
3332                             backY[++idxI] = ybase - 0.2;
3333                             backX[idxI] = ii + im->xorigin - 1;
3334                             foreY[idxI] = ytop + 0.2;
3335                             foreX[idxI] = ii + im->xorigin - 1;
3336                         }
3337                         backY[++idxI] = ybase - 0.2;
3338                         backX[idxI] = ii + im->xorigin;
3339                         foreY[idxI] = ytop + 0.2;
3340                         foreX[idxI] = ii + im->xorigin;
3341                     }
3342                     /* close up any remaining area */
3343                     free(foreY);
3344                     free(foreX);
3345                     free(backY);
3346                     free(backX);
3347                 }       /* else GF_LINE */
3348             }
3349             /* if color != 0x0 */
3350             /* make sure we do not run into trouble when stacking on NaN */
3351             for (ii = 0; ii < im->xsize; ii++) {
3352                 if (isnan(im->gdes[i].p_data[ii])) {
3353                     if (lastgdes && (im->gdes[i].stack)) {
3354                         im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
3355                     } else {
3356                         im->gdes[i].p_data[ii] = areazero;
3357                     }
3358                 }
3359             }
3360             lastgdes = &(im->gdes[i]);
3361             break;
3362         case GF_STACK:
3363             rrd_set_error
3364                 ("STACK should already be turned into LINE or AREA here");
3365             return -1;
3366             break;
3367         }               /* switch */
3368     }
3369     cairo_reset_clip(im->cr);
3370
3371     /* grid_paint also does the text */
3372     if (!(im->extra_flags & ONLY_GRAPH))
3373         grid_paint(im);
3374     if (!(im->extra_flags & ONLY_GRAPH))
3375         axis_paint(im);
3376     /* the RULES are the last thing to paint ... */
3377     for (i = 0; i < im->gdes_c; i++) {
3378
3379         switch (im->gdes[i].gf) {
3380         case GF_HRULE:
3381             if (im->gdes[i].yrule >= im->minval
3382                 && im->gdes[i].yrule <= im->maxval) {
3383                 cairo_save(im->cr);
3384                 if (im->gdes[i].dash) {
3385                     cairo_set_dash(im->cr,
3386                                    im->gdes[i].p_dashes,
3387                                    im->gdes[i].ndash, im->gdes[i].offset);
3388                 }
3389                 gfx_line(im, im->xorigin,
3390                          ytr(im, im->gdes[i].yrule),
3391                          im->xorigin + im->xsize,
3392                          ytr(im, im->gdes[i].yrule), 1.0, im->gdes[i].col);
3393                 cairo_stroke(im->cr);
3394                 cairo_restore(im->cr);
3395             }
3396             break;
3397         case GF_VRULE:
3398             if (im->gdes[i].xrule >= im->start
3399                 && im->gdes[i].xrule <= im->end) {
3400                 cairo_save(im->cr);
3401                 if (im->gdes[i].dash) {
3402                     cairo_set_dash(im->cr,
3403                                    im->gdes[i].p_dashes,
3404                                    im->gdes[i].ndash, im->gdes[i].offset);
3405                 }
3406                 gfx_line(im,
3407                          xtr(im, im->gdes[i].xrule),
3408                          im->yorigin, xtr(im,
3409                                           im->
3410                                           gdes[i].
3411                                           xrule),
3412                          im->yorigin - im->ysize, 1.0, im->gdes[i].col);
3413                 cairo_stroke(im->cr);
3414                 cairo_restore(im->cr);
3415             }
3416             break;
3417         default:
3418             break;
3419         }
3420     }
3421
3422
3423     switch (im->imgformat) {
3424     case IF_PNG:
3425     {
3426         cairo_status_t status;
3427
3428         status = strlen(im->graphfile) ?
3429             cairo_surface_write_to_png(im->surface, im->graphfile)
3430             : cairo_surface_write_to_png_stream(im->surface, &cairo_output,
3431                                                 im);
3432
3433         if (status != CAIRO_STATUS_SUCCESS) {
3434             rrd_set_error("Could not save png to '%s'", im->graphfile);
3435             return 1;
3436         }
3437         break;
3438     }
3439     default:
3440         if (strlen(im->graphfile)) {
3441             cairo_show_page(im->cr);
3442         } else {
3443             cairo_surface_finish(im->surface);
3444         }
3445         break;
3446     }
3447
3448     return 0;
3449 }
3450
3451
3452 /*****************************************************
3453  * graph stuff
3454  *****************************************************/
3455
3456 int gdes_alloc(
3457     image_desc_t *im)
3458 {
3459
3460     im->gdes_c++;
3461     if ((im->gdes = (graph_desc_t *)
3462          rrd_realloc(im->gdes, (im->gdes_c)
3463                      * sizeof(graph_desc_t))) == NULL) {
3464         rrd_set_error("realloc graph_descs");
3465         return -1;
3466     }
3467
3468
3469     im->gdes[im->gdes_c - 1].step = im->step;
3470     im->gdes[im->gdes_c - 1].step_orig = im->step;
3471     im->gdes[im->gdes_c - 1].stack = 0;
3472     im->gdes[im->gdes_c - 1].linewidth = 0;
3473     im->gdes[im->gdes_c - 1].debug = 0;
3474     im->gdes[im->gdes_c - 1].start = im->start;
3475     im->gdes[im->gdes_c - 1].start_orig = im->start;
3476     im->gdes[im->gdes_c - 1].end = im->end;
3477     im->gdes[im->gdes_c - 1].end_orig = im->end;
3478     im->gdes[im->gdes_c - 1].vname[0] = '\0';
3479     im->gdes[im->gdes_c - 1].data = NULL;
3480     im->gdes[im->gdes_c - 1].ds_namv = NULL;
3481     im->gdes[im->gdes_c - 1].data_first = 0;
3482     im->gdes[im->gdes_c - 1].p_data = NULL;
3483     im->gdes[im->gdes_c - 1].rpnp = NULL;
3484     im->gdes[im->gdes_c - 1].p_dashes = NULL;
3485     im->gdes[im->gdes_c - 1].shift = 0.0;
3486     im->gdes[im->gdes_c - 1].dash = 0;
3487     im->gdes[im->gdes_c - 1].ndash = 0;
3488     im->gdes[im->gdes_c - 1].offset = 0;
3489     im->gdes[im->gdes_c - 1].col.red = 0.0;
3490     im->gdes[im->gdes_c - 1].col.green = 0.0;
3491     im->gdes[im->gdes_c - 1].col.blue = 0.0;
3492     im->gdes[im->gdes_c - 1].col.alpha = 0.0;
3493     im->gdes[im->gdes_c - 1].legend[0] = '\0';
3494     im->gdes[im->gdes_c - 1].format[0] = '\0';
3495     im->gdes[im->gdes_c - 1].strftm = 0;
3496     im->gdes[im->gdes_c - 1].rrd[0] = '\0';
3497     im->gdes[im->gdes_c - 1].ds = -1;
3498     im->gdes[im->gdes_c - 1].cf_reduce = CF_AVERAGE;
3499     im->gdes[im->gdes_c - 1].cf = CF_AVERAGE;
3500     im->gdes[im->gdes_c - 1].yrule = DNAN;
3501     im->gdes[im->gdes_c - 1].xrule = 0;
3502     return 0;
3503 }
3504
3505 /* copies input untill the first unescaped colon is found
3506    or until input ends. backslashes have to be escaped as well */
3507 int scan_for_col(
3508     const char *const input,
3509     int len,
3510     char *const output)
3511 {
3512     int       inp, outp = 0;
3513
3514     for (inp = 0; inp < len && input[inp] != ':' && input[inp] != '\0'; inp++) {
3515         if (input[inp] == '\\'
3516             && input[inp + 1] != '\0'
3517             && (input[inp + 1] == '\\' || input[inp + 1] == ':')) {
3518             output[outp++] = input[++inp];
3519         } else {
3520             output[outp++] = input[inp];
3521         }
3522     }
3523     output[outp] = '\0';
3524     return inp;
3525 }
3526
3527 /* Now just a wrapper around rrd_graph_v */
3528 int rrd_graph(
3529     int argc,
3530     char **argv,
3531     char ***prdata,
3532     int *xsize,
3533     int *ysize,
3534     FILE * stream,
3535     double *ymin,
3536     double *ymax)
3537 {
3538     int       prlines = 0;
3539     rrd_info_t *grinfo = NULL;
3540     rrd_info_t *walker;
3541
3542     grinfo = rrd_graph_v(argc, argv);
3543     if (grinfo == NULL)
3544         return -1;
3545     walker = grinfo;
3546     (*prdata) = NULL;
3547     while (walker) {
3548         if (strcmp(walker->key, "image_info") == 0) {
3549             prlines++;
3550             if (((*prdata) =
3551                  rrd_realloc((*prdata),
3552                              (prlines + 1) * sizeof(char *))) == NULL) {
3553                 rrd_set_error("realloc prdata");
3554                 return 0;
3555             }
3556             /* imginfo goes to position 0 in the prdata array */
3557             (*prdata)[prlines - 1] = malloc((strlen(walker->value.u_str)
3558                                              + 2) * sizeof(char));
3559             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3560             (*prdata)[prlines] = NULL;
3561         }
3562         /* skip anything else */
3563         walker = walker->next;
3564     }
3565     walker = grinfo;
3566     *xsize = 0;
3567     *ysize = 0;
3568     *ymin = 0;
3569     *ymax = 0;
3570     while (walker) {
3571         if (strcmp(walker->key, "image_width") == 0) {
3572             *xsize = walker->value.u_int;
3573         } else if (strcmp(walker->key, "image_height") == 0) {
3574             *ysize = walker->value.u_int;
3575         } else if (strcmp(walker->key, "value_min") == 0) {
3576             *ymin = walker->value.u_val;
3577         } else if (strcmp(walker->key, "value_max") == 0) {
3578             *ymax = walker->value.u_val;
3579         } else if (strncmp(walker->key, "print", 5) == 0) { /* keys are prdate[0..] */
3580             prlines++;
3581             if (((*prdata) =
3582                  rrd_realloc((*prdata),
3583                              (prlines + 1) * sizeof(char *))) == NULL) {
3584                 rrd_set_error("realloc prdata");
3585                 return 0;
3586             }
3587             (*prdata)[prlines - 1] = malloc((strlen(walker->value.u_str)
3588                                              + 2) * sizeof(char));
3589             (*prdata)[prlines] = NULL;
3590             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3591         } else if (strcmp(walker->key, "image") == 0) {
3592             fwrite(walker->value.u_blo.ptr, walker->value.u_blo.size, 1,
3593                    (stream ? stream : stdout));
3594         }
3595         /* skip anything else */
3596         walker = walker->next;
3597     }
3598     rrd_info_free(grinfo);
3599     return 0;
3600 }
3601
3602
3603 /* Some surgery done on this function, it became ridiculously big.
3604 ** Things moved:
3605 ** - initializing     now in rrd_graph_init()
3606 ** - options parsing  now in rrd_graph_options()
3607 ** - script parsing   now in rrd_graph_script()
3608 */
3609 rrd_info_t *rrd_graph_v(
3610     int argc,
3611     char **argv)
3612 {
3613     image_desc_t im;
3614     rrd_info_t *grinfo;
3615
3616     rrd_graph_init(&im);
3617     /* a dummy surface so that we can measure text sizes for placements */
3618     im.surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 10, 10);
3619     im.cr = cairo_create(im.surface);
3620     rrd_graph_options(argc, argv, &im);
3621     if (rrd_test_error()) {
3622         rrd_info_free(im.grinfo);
3623         im_free(&im);
3624         return NULL;
3625     }
3626
3627     if (optind >= argc) {
3628         rrd_info_free(im.grinfo);
3629         im_free(&im);
3630         rrd_set_error("missing filename");
3631         return NULL;
3632     }
3633
3634     if (strlen(argv[optind]) >= MAXPATH) {
3635         rrd_set_error("filename (including path) too long");
3636         rrd_info_free(im.grinfo);
3637         im_free(&im);
3638         return NULL;
3639     }
3640
3641     strncpy(im.graphfile, argv[optind], MAXPATH - 1);
3642     im.graphfile[MAXPATH - 1] = '\0';
3643
3644     if (strcmp(im.graphfile, "-") == 0) {
3645         im.graphfile[0] = '\0';
3646     }
3647
3648     rrd_graph_script(argc, argv, &im, 1);
3649     if (rrd_test_error()) {
3650         rrd_info_free(im.grinfo);
3651         im_free(&im);
3652         return NULL;
3653     }
3654
3655     /* Everything is now read and the actual work can start */
3656
3657     if (graph_paint(&im) == -1) {
3658         rrd_info_free(im.grinfo);
3659         im_free(&im);
3660         return NULL;
3661     }
3662
3663
3664     /* The image is generated and needs to be output.
3665      ** Also, if needed, print a line with information about the image.
3666      */
3667
3668     if (im.imginfo) {
3669         rrd_infoval_t info;
3670
3671         info.u_str =
3672             sprintf_alloc(im.imginfo,
3673                           im.graphfile,
3674                           (long) (im.zoom *
3675                                   im.ximg), (long) (im.zoom * im.yimg));
3676         grinfo_push(&im, sprintf_alloc("image_info"), RD_I_STR, info);
3677         free(info.u_str);
3678     }
3679     if (im.rendered_image) {
3680         rrd_infoval_t img;
3681
3682         img.u_blo.size = im.rendered_image_size;
3683         img.u_blo.ptr = im.rendered_image;
3684         grinfo_push(&im, sprintf_alloc("image"), RD_I_BLO, img);
3685     }
3686     grinfo = im.grinfo;
3687     im_free(&im);
3688     return grinfo;
3689 }
3690
3691 void rrd_graph_init(
3692     image_desc_t
3693     *im)
3694 {
3695     unsigned int i;
3696
3697 #ifdef HAVE_TZSET
3698     tzset();
3699 #endif
3700 #ifdef HAVE_SETLOCALE
3701     setlocale(LC_TIME, "");
3702 #ifdef HAVE_MBSTOWCS
3703     setlocale(LC_CTYPE, "");
3704 #endif
3705 #endif
3706     im->base = 1000;
3707     im->cr = NULL;
3708     im->draw_x_grid = 1;
3709     im->draw_y_grid = 1;
3710     im->extra_flags = 0;
3711     im->font_options = cairo_font_options_create();
3712     im->forceleftspace = 0;
3713     im->gdes_c = 0;
3714     im->gdes = NULL;
3715     im->graph_antialias = CAIRO_ANTIALIAS_GRAY;
3716     im->grid_dash_off = 1;
3717     im->grid_dash_on = 1;
3718     im->gridfit = 1;
3719     im->grinfo = (rrd_info_t *) NULL;
3720     im->grinfo_current = (rrd_info_t *) NULL;
3721     im->imgformat = IF_PNG;
3722     im->imginfo = NULL;
3723     im->lazy = 0;
3724     im->logarithmic = 0;
3725     im->maxval = DNAN;
3726     im->minval = 0;
3727     im->minval = DNAN;
3728     im->prt_c = 0;
3729     im->rigid = 0;
3730     im->rendered_image_size = 0;
3731     im->rendered_image = NULL;
3732     im->slopemode = 0;
3733     im->step = 0;
3734     im->surface = NULL;
3735     im->symbol = ' ';
3736     im->tabwidth = 40.0;
3737     im->title[0] = '\0';
3738     im->unitsexponent = 9999;
3739     im->unitslength = 6;
3740     im->viewfactor = 1.0;
3741     im->watermark[0] = '\0';
3742     im->with_markup = 0;
3743     im->ximg = 0;
3744     im->xlab_user.minsec = -1;
3745     im->xorigin = 0;
3746     im->xsize = 400;
3747     im->ygridstep = DNAN;
3748     im->yimg = 0;
3749     im->ylegend[0] = '\0';
3750     im->yorigin = 0;
3751     im->ysize = 100;
3752     im->zoom = 1;
3753     cairo_font_options_set_hint_style
3754         (im->font_options, CAIRO_HINT_STYLE_FULL);
3755     cairo_font_options_set_hint_metrics
3756         (im->font_options, CAIRO_HINT_METRICS_ON);
3757     cairo_font_options_set_antialias(im->font_options, CAIRO_ANTIALIAS_GRAY);
3758     for (i = 0; i < DIM(graph_col); i++)
3759         im->graph_col[i] = graph_col[i];
3760     {
3761         char     *deffont;
3762
3763         deffont = getenv("RRD_DEFAULT_FONT");
3764         if (deffont != NULL) {
3765             for (i = 0; i < DIM(text_prop); i++) {
3766                 strncpy(text_prop[i].font, deffont,
3767                         sizeof(text_prop[i].font) - 1);
3768                 text_prop[i].font[sizeof(text_prop[i].font) - 1] = '\0';
3769             }
3770         }
3771     }
3772     for (i = 0; i < DIM(text_prop); i++) {
3773         im->text_prop[i].size = text_prop[i].size;
3774         strcpy(im->text_prop[i].font, text_prop[i].font);
3775     }
3776 }
3777
3778 void rrd_graph_options(
3779     int argc,
3780     char *argv[],
3781     image_desc_t
3782     *im)
3783 {
3784     int       stroff;
3785     char     *parsetime_error = NULL;
3786     char      scan_gtm[12], scan_mtm[12], scan_ltm[12], col_nam[12];
3787     time_t    start_tmp = 0, end_tmp = 0;
3788     long      long_tmp;
3789     rrd_time_value_t start_tv, end_tv;
3790     long unsigned int color;
3791     char     *old_locale = "";
3792
3793     /* defines for long options without a short equivalent. should be bytes,
3794        and may not collide with (the ASCII value of) short options */
3795 #define LONGOPT_UNITS_SI 255
3796
3797 /* *INDENT-OFF* */
3798     struct option long_options[] = {
3799         { "start",              required_argument, 0, 's'},
3800         { "end",                required_argument, 0, 'e'},
3801         { "x-grid",             required_argument, 0, 'x'},
3802         { "y-grid",             required_argument, 0, 'y'},
3803         { "vertical-label",     required_argument, 0, 'v'},
3804         { "width",              required_argument, 0, 'w'},
3805         { "height",             required_argument, 0, 'h'},
3806         { "full-size-mode",     no_argument,       0, 'D'},
3807         { "interlaced",         no_argument,       0, 'i'},
3808         { "upper-limit",        required_argument, 0, 'u'},
3809         { "lower-limit",        required_argument, 0, 'l'},
3810         { "rigid",              no_argument,       0, 'r'},
3811         { "base",               required_argument, 0, 'b'},
3812         { "logarithmic",        no_argument,       0, 'o'},
3813         { "color",              required_argument, 0, 'c'},
3814         { "font",               required_argument, 0, 'n'},
3815         { "title",              required_argument, 0, 't'},
3816         { "imginfo",            required_argument, 0, 'f'},
3817         { "imgformat",          required_argument, 0, 'a'},
3818         { "lazy",               no_argument,       0, 'z'},
3819         { "zoom",               required_argument, 0, 'm'},
3820         { "no-legend",          no_argument,       0, 'g'},
3821         { "force-rules-legend", no_argument,       0, 'F'},
3822         { "only-graph",         no_argument,       0, 'j'},
3823         { "alt-y-grid",         no_argument,       0, 'Y'},
3824         { "no-minor",           no_argument,       0, 'I'},
3825         { "slope-mode",         no_argument,       0, 'E'},
3826         { "alt-autoscale",      no_argument,       0, 'A'},
3827         { "alt-autoscale-min",  no_argument,       0, 'J'},
3828         { "alt-autoscale-max",  no_argument,       0, 'M'},
3829         { "no-gridfit",         no_argument,       0, 'N'},
3830         { "units-exponent",     required_argument, 0, 'X'},
3831         { "units-length",       required_argument, 0, 'L'},
3832         { "units",              required_argument, 0, LONGOPT_UNITS_SI},
3833         { "step",               required_argument, 0, 'S'},
3834         { "tabwidth",           required_argument, 0, 'T'},
3835         { "font-render-mode",   required_argument, 0, 'R'},
3836         { "graph-render-mode",  required_argument, 0, 'G'},
3837         { "font-smoothing-threshold", required_argument, 0, 'B'},
3838         { "watermark",          required_argument, 0, 'W'},
3839         { "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 */
3840         { "pango-markup",       no_argument,       0, 'P'},
3841         {  0, 0, 0, 0}
3842 };
3843 /* *INDENT-ON* */
3844
3845     optind = 0;
3846     opterr = 0;         /* initialize getopt */
3847     rrd_parsetime("end-24h", &start_tv);
3848     rrd_parsetime("now", &end_tv);
3849     while (1) {
3850         int       option_index = 0;
3851         int       opt;
3852         int       col_start, col_end;
3853
3854         opt = getopt_long(argc, argv,
3855                           "s:e:x:y:v:w:h:D:iu:l:rb:oc:n:m:t:f:a:I:zgjFYAMEX:L:S:T:NR:B:W:kP",
3856                           long_options, &option_index);
3857         if (opt == EOF)
3858             break;
3859         switch (opt) {
3860         case 'I':
3861             im->extra_flags |= NOMINOR;
3862             break;
3863         case 'Y':
3864             im->extra_flags |= ALTYGRID;
3865             break;
3866         case 'A':
3867             im->extra_flags |= ALTAUTOSCALE;
3868             break;
3869         case 'J':
3870             im->extra_flags |= ALTAUTOSCALE_MIN;
3871             break;
3872         case 'M':
3873             im->extra_flags |= ALTAUTOSCALE_MAX;
3874             break;
3875         case 'j':
3876             im->extra_flags |= ONLY_GRAPH;
3877             break;
3878         case 'g':
3879             im->extra_flags |= NOLEGEND;
3880             break;
3881         case 'F':
3882             im->extra_flags |= FORCE_RULES_LEGEND;
3883             break;
3884         case LONGOPT_UNITS_SI:
3885             if (im->extra_flags & FORCE_UNITS) {
3886                 rrd_set_error("--units can only be used once!");
3887                 setlocale(LC_NUMERIC, old_locale);
3888                 return;
3889             }
3890             if (strcmp(optarg, "si") == 0)
3891                 im->extra_flags |= FORCE_UNITS_SI;
3892             else {
3893                 rrd_set_error("invalid argument for --units: %s", optarg);
3894                 return;
3895             }
3896             break;
3897         case 'X':
3898             im->unitsexponent = atoi(optarg);
3899             break;
3900         case 'L':
3901             im->unitslength = atoi(optarg);
3902             im->forceleftspace = 1;
3903             break;
3904         case 'T':
3905             old_locale = setlocale(LC_NUMERIC, "C");
3906             im->tabwidth = atof(optarg);
3907             setlocale(LC_NUMERIC, old_locale);
3908             break;
3909         case 'S':
3910             old_locale = setlocale(LC_NUMERIC, "C");
3911             im->step = atoi(optarg);
3912             setlocale(LC_NUMERIC, old_locale);
3913             break;
3914         case 'N':
3915             im->gridfit = 0;
3916             break;
3917         case 'P':
3918             im->with_markup = 1;
3919             break;
3920         case 's':
3921             if ((parsetime_error = rrd_parsetime(optarg, &start_tv))) {
3922                 rrd_set_error("start time: %s", parsetime_error);
3923                 return;
3924             }
3925             break;
3926         case 'e':
3927             if ((parsetime_error = rrd_parsetime(optarg, &end_tv))) {
3928                 rrd_set_error("end time: %s", parsetime_error);
3929                 return;
3930             }
3931             break;
3932         case 'x':
3933             if (strcmp(optarg, "none") == 0) {
3934                 im->draw_x_grid = 0;
3935                 break;
3936             };
3937             if (sscanf(optarg,
3938                        "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
3939                        scan_gtm,
3940                        &im->xlab_user.gridst,
3941                        scan_mtm,
3942                        &im->xlab_user.mgridst,
3943                        scan_ltm,
3944                        &im->xlab_user.labst,
3945                        &im->xlab_user.precis, &stroff) == 7 && stroff != 0) {
3946                 strncpy(im->xlab_form, optarg + stroff,
3947                         sizeof(im->xlab_form) - 1);
3948                 im->xlab_form[sizeof(im->xlab_form) - 1] = '\0';
3949                 if ((int)
3950                     (im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1) {
3951                     rrd_set_error("unknown keyword %s", scan_gtm);
3952                     return;
3953                 } else if ((int)
3954                            (im->xlab_user.mgridtm = tmt_conv(scan_mtm))
3955                            == -1) {
3956                     rrd_set_error("unknown keyword %s", scan_mtm);
3957                     return;
3958                 } else if ((int)
3959                            (im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1) {
3960                     rrd_set_error("unknown keyword %s", scan_ltm);
3961                     return;
3962                 }
3963                 im->xlab_user.minsec = 1;
3964                 im->xlab_user.stst = im->xlab_form;
3965             } else {
3966                 rrd_set_error("invalid x-grid format");
3967                 return;
3968             }
3969             break;
3970         case 'y':
3971
3972             if (strcmp(optarg, "none") == 0) {
3973                 im->draw_y_grid = 0;
3974                 break;
3975             };
3976             old_locale = setlocale(LC_NUMERIC, "C");
3977             if (sscanf(optarg, "%lf:%d", &im->ygridstep, &im->ylabfact) == 2) {
3978                 setlocale(LC_NUMERIC, old_locale);
3979                 if (im->ygridstep <= 0) {
3980                     rrd_set_error("grid step must be > 0");
3981                     return;
3982                 } else if (im->ylabfact < 1) {
3983                     rrd_set_error("label factor must be > 0");
3984                     return;
3985                 }
3986             } else {
3987                 setlocale(LC_NUMERIC, old_locale);
3988                 rrd_set_error("invalid y-grid format");
3989                 return;
3990             }
3991             break;
3992         case 'v':
3993             strncpy(im->ylegend, optarg, 150);
3994             im->ylegend[150] = '\0';
3995             break;
3996         case 'u':
3997             old_locale = setlocale(LC_NUMERIC, "C");
3998             im->maxval = atof(optarg);
3999             setlocale(LC_NUMERIC, old_locale);
4000             break;
4001         case 'l':
4002             old_locale = setlocale(LC_NUMERIC, "C");
4003             im->minval = atof(optarg);
4004             setlocale(LC_NUMERIC, old_locale);
4005             break;
4006         case 'b':
4007             im->base = atol(optarg);
4008             if (im->base != 1024 && im->base != 1000) {
4009                 rrd_set_error
4010                     ("the only sensible value for base apart from 1000 is 1024");
4011                 return;
4012             }
4013             break;
4014         case 'w':
4015             long_tmp = atol(optarg);
4016             if (long_tmp < 10) {
4017                 rrd_set_error("width below 10 pixels");
4018                 return;
4019             }
4020             im->xsize = long_tmp;
4021             break;
4022         case 'h':
4023             long_tmp = atol(optarg);
4024             if (long_tmp < 10) {
4025                 rrd_set_error("height below 10 pixels");
4026                 return;
4027             }
4028             im->ysize = long_tmp;
4029             break;
4030         case 'D':
4031             im->extra_flags |= FULL_SIZE_MODE;
4032             break;
4033         case 'i':
4034             /* interlaced png not supported at the moment */
4035             break;
4036         case 'r':
4037             im->rigid = 1;
4038             break;
4039         case 'f':
4040             im->imginfo = optarg;
4041             break;
4042         case 'a':
4043             if ((int)
4044                 (im->imgformat = if_conv(optarg)) == -1) {
4045                 rrd_set_error("unsupported graphics format '%s'", optarg);
4046                 return;
4047             }
4048             break;
4049         case 'z':
4050             im->lazy = 1;
4051             break;
4052         case 'E':
4053             im->slopemode = 1;
4054             break;
4055         case 'o':
4056             im->logarithmic = 1;
4057             break;
4058         case 'c':
4059             if (sscanf(optarg,
4060                        "%10[A-Z]#%n%8lx%n",
4061                        col_nam, &col_start, &color, &col_end) == 2) {
4062                 int       ci;
4063                 int       col_len = col_end - col_start;
4064
4065                 switch (col_len) {
4066                 case 3:
4067                     color =
4068                         (((color & 0xF00) * 0x110000) | ((color & 0x0F0) *
4069                                                          0x011000) |
4070                          ((color & 0x00F)
4071                           * 0x001100)
4072                          | 0x000000FF);
4073                     break;
4074                 case 4:
4075                     color =
4076                         (((color & 0xF000) *
4077                           0x11000) | ((color & 0x0F00) *
4078                                       0x01100) | ((color &
4079                                                    0x00F0) *
4080                                                   0x00110) |
4081                          ((color & 0x000F) * 0x00011)
4082                         );
4083                     break;
4084                 case 6:
4085                     color = (color << 8) + 0xff /* shift left by 8 */ ;
4086                     break;
4087                 case 8:
4088                     break;
4089                 default:
4090                     rrd_set_error("the color format is #RRGGBB[AA]");
4091                     return;
4092                 }
4093                 if ((ci = grc_conv(col_nam)) != -1) {
4094                     im->graph_col[ci] = gfx_hex_to_col(color);
4095                 } else {
4096                     rrd_set_error("invalid color name '%s'", col_nam);
4097                     return;
4098                 }
4099             } else {
4100                 rrd_set_error("invalid color def format");
4101                 return;
4102             }
4103             break;
4104         case 'n':{
4105             char      prop[15];
4106             double    size = 1;
4107             int       end;
4108
4109             old_locale = setlocale(LC_NUMERIC, "C");
4110             if (sscanf(optarg, "%10[A-Z]:%lf%n", prop, &size, &end) >= 2) {
4111                 int       sindex, propidx;
4112
4113                 setlocale(LC_NUMERIC, old_locale);
4114                 if ((sindex = text_prop_conv(prop)) != -1) {
4115                     for (propidx = sindex;
4116                          propidx < TEXT_PROP_LAST; propidx++) {
4117                         if (size > 0) {
4118                             im->text_prop[propidx].size = size;
4119                         }
4120                         if ((int) strlen(optarg) > end) {
4121                             if (optarg[end] == ':') {
4122                                 strncpy(im->text_prop[propidx].font,
4123                                         optarg + end + 1, 255);
4124                                 im->text_prop[propidx].font[255] = '\0';
4125                             } else {
4126                                 rrd_set_error
4127                                     ("expected : after font size in '%s'",
4128                                      optarg);
4129                                 return;
4130                             }
4131                         }
4132                         /* only run the for loop for DEFAULT (0) for
4133                            all others, we break here. woodo programming */
4134                         if (propidx == sindex && sindex != 0)
4135                             break;
4136                     }
4137                 } else {
4138                     rrd_set_error("invalid fonttag '%s'", prop);
4139                     return;
4140                 }
4141             } else {
4142                 setlocale(LC_NUMERIC, old_locale);
4143                 rrd_set_error("invalid text property format");
4144                 return;
4145             }
4146             break;
4147         }
4148         case 'm':
4149             old_locale = setlocale(LC_NUMERIC, "C");
4150             im->zoom = atof(optarg);
4151             setlocale(LC_NUMERIC, old_locale);
4152             if (im->zoom <= 0.0) {
4153                 rrd_set_error("zoom factor must be > 0");
4154                 return;
4155             }
4156             break;
4157         case 't':
4158             strncpy(im->title, optarg, 150);
4159             im->title[150] = '\0';
4160             break;
4161         case 'R':
4162             if (strcmp(optarg, "normal") == 0) {
4163                 cairo_font_options_set_antialias
4164                     (im->font_options, CAIRO_ANTIALIAS_GRAY);
4165                 cairo_font_options_set_hint_style
4166                     (im->font_options, CAIRO_HINT_STYLE_FULL);
4167             } else if (strcmp(optarg, "light") == 0) {
4168                 cairo_font_options_set_antialias
4169                     (im->font_options, CAIRO_ANTIALIAS_GRAY);
4170                 cairo_font_options_set_hint_style
4171                     (im->font_options, CAIRO_HINT_STYLE_SLIGHT);
4172             } else if (strcmp(optarg, "mono") == 0) {
4173                 cairo_font_options_set_antialias
4174                     (im->font_options, CAIRO_ANTIALIAS_NONE);
4175                 cairo_font_options_set_hint_style
4176                     (im->font_options, CAIRO_HINT_STYLE_FULL);
4177             } else {
4178                 rrd_set_error("unknown font-render-mode '%s'", optarg);
4179                 return;
4180             }
4181             break;
4182         case 'G':
4183             if (strcmp(optarg, "normal") == 0)
4184                 im->graph_antialias = CAIRO_ANTIALIAS_GRAY;
4185             else if (strcmp(optarg, "mono") == 0)
4186                 im->graph_antialias = CAIRO_ANTIALIAS_NONE;
4187             else {
4188                 rrd_set_error("unknown graph-render-mode '%s'", optarg);
4189                 return;
4190             }
4191             break;
4192         case 'B':
4193             /* not supported curently */
4194             break;
4195         case 'W':
4196             strncpy(im->watermark, optarg, 100);
4197             im->watermark[99] = '\0';
4198             break;
4199         case '?':
4200             if (optopt != 0)
4201                 rrd_set_error("unknown option '%c'", optopt);
4202             else
4203                 rrd_set_error("unknown option '%s'", argv[optind - 1]);
4204             return;
4205         }
4206     }
4207
4208     if (im->logarithmic && im->minval <= 0) {
4209         rrd_set_error
4210             ("for a logarithmic yaxis you must specify a lower-limit > 0");
4211         return;
4212     }
4213
4214     if (rrd_proc_start_end(&start_tv, &end_tv, &start_tmp, &end_tmp) == -1) {
4215         /* error string is set in rrd_parsetime.c */
4216         return;
4217     }
4218
4219     if (start_tmp < 3600 * 24 * 365 * 10) {
4220         rrd_set_error
4221             ("the first entry to fetch should be after 1980 (%ld)",
4222              start_tmp);
4223         return;
4224     }
4225
4226     if (end_tmp < start_tmp) {
4227         rrd_set_error
4228             ("start (%ld) should be less than end (%ld)", start_tmp, end_tmp);
4229         return;
4230     }
4231
4232     im->start = start_tmp;
4233     im->end = end_tmp;
4234     im->step = max((long) im->step, (im->end - im->start) / im->xsize);
4235 }
4236
4237 int rrd_graph_color(
4238     image_desc_t
4239     *im,
4240     char *var,
4241     char *err,
4242     int optional)
4243 {
4244     char     *color;
4245     graph_desc_t *gdp = &im->gdes[im->gdes_c - 1];
4246
4247     color = strstr(var, "#");
4248     if (color == NULL) {
4249         if (optional == 0) {
4250             rrd_set_error("Found no color in %s", err);
4251             return 0;
4252         }
4253         return 0;
4254     } else {
4255         int       n = 0;
4256         char     *rest;
4257         long unsigned int col;
4258
4259         rest = strstr(color, ":");
4260         if (rest != NULL)
4261             n = rest - color;
4262         else
4263             n = strlen(color);
4264         switch (n) {
4265         case 7:
4266             sscanf(color, "#%6lx%n", &col, &n);
4267             col = (col << 8) + 0xff /* shift left by 8 */ ;
4268             if (n != 7)
4269                 rrd_set_error("Color problem in %s", err);
4270             break;
4271         case 9:
4272             sscanf(color, "#%8lx%n", &col, &n);
4273             if (n == 9)
4274                 break;
4275         default:
4276             rrd_set_error("Color problem in %s", err);
4277         }
4278         if (rrd_test_error())
4279             return 0;
4280         gdp->col = gfx_hex_to_col(col);
4281         return n;
4282     }
4283 }
4284
4285
4286 int bad_format(
4287     char *fmt)
4288 {
4289     char     *ptr;
4290     int       n = 0;
4291
4292     ptr = fmt;
4293     while (*ptr != '\0')
4294         if (*ptr++ == '%') {
4295
4296             /* line cannot end with percent char */
4297             if (*ptr == '\0')
4298                 return 1;
4299             /* '%s', '%S' and '%%' are allowed */
4300             if (*ptr == 's' || *ptr == 'S' || *ptr == '%')
4301                 ptr++;
4302             /* %c is allowed (but use only with vdef!) */
4303             else if (*ptr == 'c') {
4304                 ptr++;
4305                 n = 1;
4306             }
4307
4308             /* or else '% 6.2lf' and such are allowed */
4309             else {
4310                 /* optional padding character */
4311                 if (*ptr == ' ' || *ptr == '+' || *ptr == '-')
4312                     ptr++;
4313                 /* This should take care of 'm.n' with all three optional */
4314                 while (*ptr >= '0' && *ptr <= '9')
4315                     ptr++;
4316                 if (*ptr == '.')
4317                     ptr++;
4318                 while (*ptr >= '0' && *ptr <= '9')
4319                     ptr++;
4320                 /* Either 'le', 'lf' or 'lg' must follow here */
4321                 if (*ptr++ != 'l')
4322                     return 1;
4323                 if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g')
4324                     ptr++;
4325                 else
4326                     return 1;
4327                 n++;
4328             }
4329         }
4330
4331     return (n != 1);
4332 }
4333
4334
4335 int vdef_parse(
4336     struct graph_desc_t
4337     *gdes,
4338     const char *const str)
4339 {
4340     /* A VDEF currently is either "func" or "param,func"
4341      * so the parsing is rather simple.  Change if needed.
4342      */
4343     double    param;
4344     char      func[30];
4345     int       n;
4346     char     *old_locale;
4347
4348     n = 0;
4349     old_locale = setlocale(LC_NUMERIC, "C");
4350     sscanf(str, "%le,%29[A-Z]%n", &param, func, &n);
4351     setlocale(LC_NUMERIC, old_locale);
4352     if (n == (int) strlen(str)) {   /* matched */
4353         ;
4354     } else {
4355         n = 0;
4356         sscanf(str, "%29[A-Z]%n", func, &n);
4357         if (n == (int) strlen(str)) {   /* matched */
4358             param = DNAN;
4359         } else {
4360             rrd_set_error
4361                 ("Unknown function string '%s' in VDEF '%s'",
4362                  str, gdes->vname);
4363             return -1;
4364         }
4365     }
4366     if (!strcmp("PERCENT", func))
4367         gdes->vf.op = VDEF_PERCENT;
4368     else if (!strcmp("MAXIMUM", func))
4369         gdes->vf.op = VDEF_MAXIMUM;
4370     else if (!strcmp("AVERAGE", func))
4371         gdes->vf.op = VDEF_AVERAGE;
4372     else if (!strcmp("STDEV", func))
4373         gdes->vf.op = VDEF_STDEV;
4374     else if (!strcmp("MINIMUM", func))
4375         gdes->vf.op = VDEF_MINIMUM;
4376     else if (!strcmp("TOTAL", func))
4377         gdes->vf.op = VDEF_TOTAL;
4378     else if (!strcmp("FIRST", func))
4379         gdes->vf.op = VDEF_FIRST;
4380     else if (!strcmp("LAST", func))
4381         gdes->vf.op = VDEF_LAST;
4382     else if (!strcmp("LSLSLOPE", func))
4383         gdes->vf.op = VDEF_LSLSLOPE;
4384     else if (!strcmp("LSLINT", func))
4385         gdes->vf.op = VDEF_LSLINT;
4386     else if (!strcmp("LSLCORREL", func))
4387         gdes->vf.op = VDEF_LSLCORREL;
4388     else {
4389         rrd_set_error
4390             ("Unknown function '%s' in VDEF '%s'\n", func, gdes->vname);
4391         return -1;
4392     };
4393     switch (gdes->vf.op) {
4394     case VDEF_PERCENT:
4395         if (isnan(param)) { /* no parameter given */
4396             rrd_set_error
4397                 ("Function '%s' needs parameter in VDEF '%s'\n",
4398                  func, gdes->vname);
4399             return -1;
4400         };
4401         if (param >= 0.0 && param <= 100.0) {
4402             gdes->vf.param = param;
4403             gdes->vf.val = DNAN;    /* undefined */
4404             gdes->vf.when = 0;  /* undefined */
4405         } else {
4406             rrd_set_error
4407                 ("Parameter '%f' out of range in VDEF '%s'\n",
4408                  param, gdes->vname);
4409             return -1;
4410         };
4411         break;
4412     case VDEF_MAXIMUM:
4413     case VDEF_AVERAGE:
4414     case VDEF_STDEV:
4415     case VDEF_MINIMUM:
4416     case VDEF_TOTAL:
4417     case VDEF_FIRST:
4418     case VDEF_LAST:
4419     case VDEF_LSLSLOPE:
4420     case VDEF_LSLINT:
4421     case VDEF_LSLCORREL:
4422         if (isnan(param)) {
4423             gdes->vf.param = DNAN;
4424             gdes->vf.val = DNAN;
4425             gdes->vf.when = 0;
4426         } else {
4427             rrd_set_error
4428                 ("Function '%s' needs no parameter in VDEF '%s'\n",
4429                  func, gdes->vname);
4430             return -1;
4431         };
4432         break;
4433     };
4434     return 0;
4435 }
4436
4437
4438 int vdef_calc(
4439     image_desc_t *im,
4440     int gdi)
4441 {
4442     graph_desc_t *src, *dst;
4443     rrd_value_t *data;
4444     long      step, steps;
4445     unsigned long end;
4446
4447     dst = &im->gdes[gdi];
4448     src = &im->gdes[dst->vidx];
4449     data = src->data + src->ds;
4450     end =
4451         src->end_orig % (long)src->step ==
4452         0 ? src->end_orig : (src->end_orig + (long)src->step -
4453                              src->end_orig % (long)src->step);
4454
4455     steps = (end - src->start) / src->step;
4456 #if 0
4457     printf
4458         ("DEBUG: start == %lu, end == %lu, %lu steps\n",
4459          src->start, src->end_orig, steps);
4460 #endif
4461     switch (dst->vf.op) {
4462     case VDEF_PERCENT:{
4463         rrd_value_t *array;
4464         int       field;
4465         if ((array = malloc(steps * sizeof(double))) == NULL) {
4466             rrd_set_error("malloc VDEV_PERCENT");
4467             return -1;
4468         }
4469         for (step = 0; step < steps; step++) {
4470             array[step] = data[step * src->ds_cnt];
4471         }
4472         qsort(array, step, sizeof(double), vdef_percent_compar);
4473         field = (steps - 1) * dst->vf.param / 100;
4474         dst->vf.val = array[field];
4475         dst->vf.when = 0;   /* no time component */
4476         free(array);
4477 #if 0
4478         for (step = 0; step < steps; step++)
4479             printf("DEBUG: %3li:%10.2f %c\n",
4480                    step, array[step], step == field ? '*' : ' ');
4481 #endif
4482     }
4483         break;
4484     case VDEF_MAXIMUM:
4485         step = 0;
4486         while (step != steps && isnan(data[step * src->ds_cnt]))
4487             step++;
4488         if (step == steps) {
4489             dst->vf.val = DNAN;
4490             dst->vf.when = 0;
4491         } else {
4492             dst->vf.val = data[step * src->ds_cnt];
4493             dst->vf.when = src->start + (step + 1) * src->step;
4494         }
4495         while (step != steps) {
4496             if (finite(data[step * src->ds_cnt])) {
4497                 if (data[step * src->ds_cnt] > dst->vf.val) {
4498                     dst->vf.val = data[step * src->ds_cnt];
4499                     dst->vf.when = src->start + (step + 1) * src->step;
4500                 }
4501             }
4502             step++;
4503         }
4504         break;
4505     case VDEF_TOTAL:
4506     case VDEF_STDEV:
4507     case VDEF_AVERAGE:{
4508         int       cnt = 0;
4509         double    sum = 0.0;
4510         double    average = 0.0;
4511
4512         for (step = 0; step < steps; step++) {
4513             if (finite(data[step * src->ds_cnt])) {
4514                 sum += data[step * src->ds_cnt];
4515                 cnt++;
4516             };
4517         }
4518         if (cnt) {
4519             if (dst->vf.op == VDEF_TOTAL) {
4520                 dst->vf.val = sum * src->step;
4521                 dst->vf.when = 0;   /* no time component */
4522             } else if (dst->vf.op == VDEF_AVERAGE) {
4523                 dst->vf.val = sum / cnt;
4524                 dst->vf.when = 0;   /* no time component */
4525             } else {
4526                 average = sum / cnt;
4527                 sum = 0.0;
4528                 for (step = 0; step < steps; step++) {
4529                     if (finite(data[step * src->ds_cnt])) {
4530                         sum += pow((data[step * src->ds_cnt] - average), 2.0);
4531                     };
4532                 }
4533                 dst->vf.val = pow(sum / cnt, 0.5);
4534                 dst->vf.when = 0;   /* no time component */
4535             };
4536         } else {
4537             dst->vf.val = DNAN;
4538             dst->vf.when = 0;
4539         }
4540     }
4541         break;
4542     case VDEF_MINIMUM:
4543         step = 0;
4544         while (step != steps && isnan(data[step * src->ds_cnt]))
4545             step++;
4546         if (step == steps) {
4547             dst->vf.val = DNAN;
4548             dst->vf.when = 0;
4549         } else {
4550             dst->vf.val = data[step * src->ds_cnt];
4551             dst->vf.when = src->start + (step + 1) * src->step;
4552         }
4553         while (step != steps) {
4554             if (finite(data[step * src->ds_cnt])) {
4555                 if (data[step * src->ds_cnt] < dst->vf.val) {
4556                     dst->vf.val = data[step * src->ds_cnt];
4557                     dst->vf.when = src->start + (step + 1) * src->step;
4558                 }
4559             }
4560             step++;
4561         }
4562         break;
4563     case VDEF_FIRST:
4564         /* The time value returned here is one step before the
4565          * actual time value.  This is the start of the first
4566          * non-NaN interval.
4567          */
4568         step = 0;
4569         while (step != steps && isnan(data[step * src->ds_cnt]))
4570             step++;
4571         if (step == steps) {    /* all entries were NaN */
4572             dst->vf.val = DNAN;
4573             dst->vf.when = 0;
4574         } else {
4575             dst->vf.val = data[step * src->ds_cnt];
4576             dst->vf.when = src->start + step * src->step;
4577         }
4578         break;
4579     case VDEF_LAST:
4580         /* The time value returned here is the
4581          * actual time value.  This is the end of the last
4582          * non-NaN interval.
4583          */
4584         step = steps - 1;
4585         while (step >= 0 && isnan(data[step * src->ds_cnt]))
4586             step--;
4587         if (step < 0) { /* all entries were NaN */
4588             dst->vf.val = DNAN;
4589             dst->vf.when = 0;
4590         } else {
4591             dst->vf.val = data[step * src->ds_cnt];
4592             dst->vf.when = src->start + (step + 1) * src->step;
4593         }
4594         break;
4595     case VDEF_LSLSLOPE:
4596     case VDEF_LSLINT:
4597     case VDEF_LSLCORREL:{
4598         /* Bestfit line by linear least squares method */
4599
4600         int       cnt = 0;
4601         double    SUMx, SUMy, SUMxy, SUMxx, SUMyy, slope, y_intercept, correl;
4602
4603         SUMx = 0;
4604         SUMy = 0;
4605         SUMxy = 0;
4606         SUMxx = 0;
4607         SUMyy = 0;
4608         for (step = 0; step < steps; step++) {
4609             if (finite(data[step * src->ds_cnt])) {
4610                 cnt++;
4611                 SUMx += step;
4612                 SUMxx += step * step;
4613                 SUMxy += step * data[step * src->ds_cnt];
4614                 SUMy += data[step * src->ds_cnt];
4615                 SUMyy += data[step * src->ds_cnt] * data[step * src->ds_cnt];
4616             };
4617         }
4618
4619         slope = (SUMx * SUMy - cnt * SUMxy) / (SUMx * SUMx - cnt * SUMxx);
4620         y_intercept = (SUMy - slope * SUMx) / cnt;
4621         correl =
4622             (SUMxy -
4623              (SUMx * SUMy) / cnt) /
4624             sqrt((SUMxx -
4625                   (SUMx * SUMx) / cnt) * (SUMyy - (SUMy * SUMy) / cnt));
4626         if (cnt) {
4627             if (dst->vf.op == VDEF_LSLSLOPE) {
4628                 dst->vf.val = slope;
4629                 dst->vf.when = 0;
4630             } else if (dst->vf.op == VDEF_LSLINT) {
4631                 dst->vf.val = y_intercept;
4632                 dst->vf.when = 0;
4633             } else if (dst->vf.op == VDEF_LSLCORREL) {
4634                 dst->vf.val = correl;
4635                 dst->vf.when = 0;
4636             };
4637         } else {
4638             dst->vf.val = DNAN;
4639             dst->vf.when = 0;
4640         }
4641     }
4642         break;
4643     }
4644     return 0;
4645 }
4646
4647 /* NaN < -INF < finite_values < INF */
4648 int vdef_percent_compar(
4649     const void
4650     *a,
4651     const void
4652     *b)
4653 {
4654     /* Equality is not returned; this doesn't hurt except
4655      * (maybe) for a little performance.
4656      */
4657
4658     /* First catch NaN values. They are smallest */
4659     if (isnan(*(double *) a))
4660         return -1;
4661     if (isnan(*(double *) b))
4662         return 1;
4663     /* NaN doesn't reach this part so INF and -INF are extremes.
4664      * The sign from isinf() is compatible with the sign we return
4665      */
4666     if (isinf(*(double *) a))
4667         return isinf(*(double *) a);
4668     if (isinf(*(double *) b))
4669         return isinf(*(double *) b);
4670     /* If we reach this, both values must be finite */
4671     if (*(double *) a < *(double *) b)
4672         return -1;
4673     else
4674         return 1;
4675 }
4676
4677 void grinfo_push(
4678     image_desc_t *im,
4679     char *key,
4680     rrd_info_type_t type,
4681     rrd_infoval_t value)
4682 {
4683     im->grinfo_current = rrd_info_push(im->grinfo_current, key, type, value);
4684     if (im->grinfo == NULL) {
4685         im->grinfo = im->grinfo_current;
4686     }
4687 }