src/rrd_graph.c

   1 /****************************************************************************
   2  * RRDtool 1.2.0  Copyright by Tobi Oetiker, 1997-2005
   3  ****************************************************************************
   4  * rrd__graph.c  produce graphs from data in rrdfiles
   5  ****************************************************************************/
   6
   7
   8 #include <sys/stat.h>
   9
  10 #include "rrd_tool.h"
  11
  12 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
  13 #include <io.h>
  14 #include <fcntl.h>
  15 #endif
  16
  17 #ifdef HAVE_TIME_H
  18 #include <time.h>
  19 #endif
  20
  21 #ifdef HAVE_LOCALE_H
  22 #include <locale.h>
  23 #endif
  24
  25 #include "rrd_graph.h"
  26
  27 /* some constant definitions */
  28
  29
  30
  31 #ifndef RRD_DEFAULT_FONT
  32 /* there is special code later to pick Cour.ttf when running on windows */
  33 #define RRD_DEFAULT_FONT "VeraMono.ttf"
  34 #endif
  35
  36 text_prop_t text_prop[] = {
  37      { 8.0, RRD_DEFAULT_FONT }, /* default */
  38      { 9.0, RRD_DEFAULT_FONT }, /* title */
  39      { 7.0,  RRD_DEFAULT_FONT }, /* axis */
  40      { 8.0, RRD_DEFAULT_FONT }, /* unit */
  41      { 8.0, RRD_DEFAULT_FONT }  /* legend */
  42 };
  43
  44 xlab_t xlab[] = {
  45     {0,        TMT_SECOND,30, TMT_MINUTE,5,  TMT_MINUTE,5,         0,"%H:%M"},
  46     {2,        TMT_MINUTE,1,  TMT_MINUTE,5,  TMT_MINUTE,5,         0,"%H:%M"},
  47     {5,        TMT_MINUTE,2,  TMT_MINUTE,10, TMT_MINUTE,10,        0,"%H:%M"},
  48     {10,       TMT_MINUTE,5,  TMT_MINUTE,20, TMT_MINUTE,20,        0,"%H:%M"},
  49     {30,       TMT_MINUTE,10, TMT_HOUR,1,    TMT_HOUR,1,           0,"%H:%M"},
  50     {60,       TMT_MINUTE,30, TMT_HOUR,2,    TMT_HOUR,2,           0,"%H:%M"},
  51     {180,      TMT_HOUR,1,    TMT_HOUR,6,    TMT_HOUR,6,           0,"%H:%M"},
  52     /*{300,      TMT_HOUR,3,    TMT_HOUR,12,   TMT_HOUR,12,    12*3600,"%a %p"},  this looks silly*/
  53     {600,      TMT_HOUR,6,    TMT_DAY,1,     TMT_DAY,1,      24*3600,"%a"},
  54     {1800,     TMT_HOUR,12,   TMT_DAY,1,     TMT_DAY,2,      24*3600,"%a"},
  55     {3600,     TMT_DAY,1,     TMT_WEEK,1,     TMT_WEEK,1,    7*24*3600,"Week %V"},
  56     {3*3600,   TMT_WEEK,1,      TMT_MONTH,1,     TMT_WEEK,2,    7*24*3600,"Week %V"},
  57     {6*3600,   TMT_MONTH,1,   TMT_MONTH,1,   TMT_MONTH,1, 30*24*3600,"%b"},
  58     {48*3600,  TMT_MONTH,1,   TMT_MONTH,3,   TMT_MONTH,3, 30*24*3600,"%b"},
  59     {10*24*3600, TMT_YEAR,1,  TMT_YEAR,1,    TMT_YEAR,1, 365*24*3600,"%y"},
  60     {-1,TMT_MONTH,0,TMT_MONTH,0,TMT_MONTH,0,0,""}
  61 };
  62
  63 /* sensible logarithmic y label intervals ...
  64    the first element of each row defines the possible starting points on the
  65    y axis ... the other specify the */
  66
  67 double yloglab[][12]= {{ 1e9, 1,  0,  0,  0,   0,  0,  0,  0,  0,  0,  0 },
  68                        {  1e3, 1,  0,  0,  0,   0,  0,  0,  0,  0,  0,  0 },
  69                        {  1e1, 1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
  70                        /* {  1e1, 1,  5,  0,  0,  0,  0,  0,  0,  0,  0,  0 }, */
  71                        {  1e1, 1,  2.5,  5,  7.5,  0,  0,  0,  0,  0,  0,  0 },
  72                        {  1e1, 1,  2,  4,  6,  8,  0,  0,  0,  0,  0,  0 },
  73                        {  1e1, 1,  2,  3,  4,  5,  6,  7,  8,  9,  0,  0 },
  74                        {  0,   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 }};
  75
  76 /* sensible y label intervals ...*/
  77
  78 ylab_t ylab[]= {
  79     {0.1, {1,2, 5,10}},
  80     {0.2, {1,5,10,20}},
  81     {0.5, {1,2, 4,10}},
  82     {1.0,   {1,2, 5,10}},
  83     {2.0,   {1,5,10,20}},
  84     {5.0,   {1,2, 4,10}},
  85     {10.0,  {1,2, 5,10}},
  86     {20.0,  {1,5,10,20}},
  87     {50.0,  {1,2, 4,10}},
  88     {100.0, {1,2, 5,10}},
  89     {200.0, {1,5,10,20}},
  90     {500.0, {1,2, 4,10}},
  91     {0.0,   {0,0,0,0}}};
  92
  93
  94 gfx_color_t graph_col[] =   /* default colors */
  95 {    0xFFFFFFFF,   /* canvas     */
  96      0xF0F0F0FF,   /* background */
  97      0xD0D0D0FF,   /* shade A    */
  98      0xA0A0A0FF,   /* shade B    */
  99      0x90909080,   /* grid       */
 100      0xE0505080,   /* major grid */
 101      0x000000FF,   /* font       */
 102      0x802020FF,   /* arrow      */
 103      0x202020FF    /* axis       */
 104 };
 105
 106
 107 /* #define DEBUG */
 108
 109 #ifdef DEBUG
 110 # define DPRINT(x)    (void)(printf x, printf("\n"))
 111 #else
 112 # define DPRINT(x)
 113 #endif
 114
 115
 116 /* initialize with xtr(im,0); */
 117 int
 118 xtr(image_desc_t *im,time_t mytime){
 119     static double pixie;
 120     if (mytime==0){
 121         pixie = (double) im->xsize / (double)(im->end - im->start);
 122         return im->xorigin;
 123     }
 124     return (int)((double)im->xorigin
 125                  + pixie * ( mytime - im->start ) );
 126 }
 127
 128 /* translate data values into y coordinates */
 129 double
 130 ytr(image_desc_t *im, double value){
 131     static double pixie;
 132     double yval;
 133     if (isnan(value)){
 134       if(!im->logarithmic)
 135         pixie = (double) im->ysize / (im->maxval - im->minval);
 136       else
 137         pixie = (double) im->ysize / (log10(im->maxval) - log10(im->minval));
 138       yval = im->yorigin;
 139     } else if(!im->logarithmic) {
 140       yval = im->yorigin - pixie * (value - im->minval);
 141     } else {
 142       if (value < im->minval) {
 143         yval = im->yorigin;
 144       } else {
 145         yval = im->yorigin - pixie * (log10(value) - log10(im->minval));
 146       }
 147     }
 148     /* make sure we don't return anything too unreasonable. GD lib can
 149        get terribly slow when drawing lines outside its scope. This is
 150        especially problematic in connection with the rigid option */
 151     if (! im->rigid) {
 152       /* keep yval as-is */
 153     } else if (yval > im->yorigin) {
 154       yval = im->yorigin+2;
 155     } else if (yval < im->yorigin - im->ysize){
 156       yval = im->yorigin - im->ysize - 2;
 157     }
 158     return yval;
 159 }
 160
 161
 162
 163 /* conversion function for symbolic entry names */
 164
 165
 166 #define conv_if(VV,VVV) \
 167    if (strcmp(#VV, string) == 0) return VVV ;
 168
 169 enum gf_en gf_conv(char *string){
 170
 171     conv_if(PRINT,GF_PRINT)
 172     conv_if(GPRINT,GF_GPRINT)
 173     conv_if(COMMENT,GF_COMMENT)
 174     conv_if(HRULE,GF_HRULE)
 175     conv_if(VRULE,GF_VRULE)
 176     conv_if(LINE,GF_LINE)
 177     conv_if(AREA,GF_AREA)
 178     conv_if(STACK,GF_STACK)
 179     conv_if(TICK,GF_TICK)
 180     conv_if(DEF,GF_DEF)
 181     conv_if(CDEF,GF_CDEF)
 182     conv_if(VDEF,GF_VDEF)
 183 #ifdef WITH_PIECHART
 184     conv_if(PART,GF_PART)
 185 #endif
 186     conv_if(XPORT,GF_XPORT)
 187     conv_if(SHIFT,GF_SHIFT)
 188
 189     return (-1);
 190 }
 191
 192 enum gfx_if_en if_conv(char *string){
 193
 194     conv_if(PNG,IF_PNG)
 195     conv_if(SVG,IF_SVG)
 196     conv_if(EPS,IF_EPS)
 197     conv_if(PDF,IF_PDF)
 198
 199     return (-1);
 200 }
 201
 202 enum tmt_en tmt_conv(char *string){
 203
 204     conv_if(SECOND,TMT_SECOND)
 205     conv_if(MINUTE,TMT_MINUTE)
 206     conv_if(HOUR,TMT_HOUR)
 207     conv_if(DAY,TMT_DAY)
 208     conv_if(WEEK,TMT_WEEK)
 209     conv_if(MONTH,TMT_MONTH)
 210     conv_if(YEAR,TMT_YEAR)
 211     return (-1);
 212 }
 213
 214 enum grc_en grc_conv(char *string){
 215
 216     conv_if(BACK,GRC_BACK)
 217     conv_if(CANVAS,GRC_CANVAS)
 218     conv_if(SHADEA,GRC_SHADEA)
 219     conv_if(SHADEB,GRC_SHADEB)
 220     conv_if(GRID,GRC_GRID)
 221     conv_if(MGRID,GRC_MGRID)
 222     conv_if(FONT,GRC_FONT)
 223     conv_if(ARROW,GRC_ARROW)
 224     conv_if(AXIS,GRC_AXIS)
 225
 226     return -1;
 227 }
 228
 229 enum text_prop_en text_prop_conv(char *string){
 230
 231     conv_if(DEFAULT,TEXT_PROP_DEFAULT)
 232     conv_if(TITLE,TEXT_PROP_TITLE)
 233     conv_if(AXIS,TEXT_PROP_AXIS)
 234     conv_if(UNIT,TEXT_PROP_UNIT)
 235     conv_if(LEGEND,TEXT_PROP_LEGEND)
 236     return -1;
 237 }
 238
 239
 240 #undef conv_if
 241
 242 int
 243 im_free(image_desc_t *im)
 244 {
 245     unsigned long       i,ii;
 246
 247     if (im == NULL) return 0;
 248     for(i=0;i<(unsigned)im->gdes_c;i++){
 249       if (im->gdes[i].data_first){
 250         /* careful here, because a single pointer can occur several times */
 251           free (im->gdes[i].data);
 252           if (im->gdes[i].ds_namv){
 253               for (ii=0;ii<im->gdes[i].ds_cnt;ii++)
 254                   free(im->gdes[i].ds_namv[ii]);
 255               free(im->gdes[i].ds_namv);
 256           }
 257       }
 258       free (im->gdes[i].p_data);
 259       free (im->gdes[i].rpnp);
 260     }
 261     free(im->gdes);
 262     gfx_destroy(im->canvas);
 263     return 0;
 264 }
 265
 266 /* find SI magnitude symbol for the given number*/
 267 void
 268 auto_scale(
 269            image_desc_t *im,   /* image description */
 270            double *value,
 271            char **symb_ptr,
 272            double *magfact
 273            )
 274 {
 275
 276     char *symbol[] = {"a", /* 10e-18 Atto */
 277                       "f", /* 10e-15 Femto */
 278                       "p", /* 10e-12 Pico */
 279                       "n", /* 10e-9  Nano */
 280                       "u", /* 10e-6  Micro */
 281                       "m", /* 10e-3  Milli */
 282                       " ", /* Base */
 283                       "k", /* 10e3   Kilo */
 284                       "M", /* 10e6   Mega */
 285                       "G", /* 10e9   Giga */
 286                       "T", /* 10e12  Tera */
 287                       "P", /* 10e15  Peta */
 288                       "E"};/* 10e18  Exa */
 289
 290     int symbcenter = 6;
 291     int sindex;
 292
 293     if (*value == 0.0 || isnan(*value) ) {
 294         sindex = 0;
 295         *magfact = 1.0;
 296     } else {
 297         sindex = floor(log(fabs(*value))/log((double)im->base));
 298         *magfact = pow((double)im->base, (double)sindex);
 299         (*value) /= (*magfact);
 300     }
 301     if ( sindex <= symbcenter && sindex >= -symbcenter) {
 302         (*symb_ptr) = symbol[sindex+symbcenter];
 303     }
 304     else {
 305         (*symb_ptr) = "?";
 306     }
 307 }
 308
 309
 310 /* find SI magnitude symbol for the numbers on the y-axis*/
 311 void
 312 si_unit(
 313     image_desc_t *im   /* image description */
 314 )
 315 {
 316
 317     char symbol[] = {'a', /* 10e-18 Atto */
 318                      'f', /* 10e-15 Femto */
 319                      'p', /* 10e-12 Pico */
 320                      'n', /* 10e-9  Nano */
 321                      'u', /* 10e-6  Micro */
 322                      'm', /* 10e-3  Milli */
 323                      ' ', /* Base */
 324                      'k', /* 10e3   Kilo */
 325                      'M', /* 10e6   Mega */
 326                      'G', /* 10e9   Giga */
 327                      'T', /* 10e12  Tera */
 328                      'P', /* 10e15  Peta */
 329                      'E'};/* 10e18  Exa */
 330
 331     int   symbcenter = 6;
 332     double digits,viewdigits=0;
 333
 334     digits = floor( log( max( fabs(im->minval),fabs(im->maxval)))/log((double)im->base));
 335
 336     if (im->unitsexponent != 9999) {
 337         /* unitsexponent = 9, 6, 3, 0, -3, -6, -9, etc */
 338         viewdigits = floor(im->unitsexponent / 3);
 339     } else {
 340         viewdigits = digits;
 341     }
 342
 343     im->magfact = pow((double)im->base , digits);
 344
 345 #ifdef DEBUG
 346     printf("digits %6.3f  im->magfact %6.3f\n",digits,im->magfact);
 347 #endif
 348
 349     im->viewfactor = im->magfact / pow((double)im->base , viewdigits);
 350
 351     pow((double)im->base , viewdigits);
 352
 353     if ( ((viewdigits+symbcenter) < sizeof(symbol)) &&
 354                     ((viewdigits+symbcenter) >= 0) )
 355         im->symbol = symbol[(int)viewdigits+symbcenter];
 356     else
 357         im->symbol = '?';
 358  }
 359
 360 /*  move min and max values around to become sensible */
 361
 362 void
 363 expand_range(image_desc_t *im)
 364 {
 365     double sensiblevalues[] ={1000.0,900.0,800.0,750.0,700.0,
 366                               600.0,500.0,400.0,300.0,250.0,
 367                               200.0,125.0,100.0,90.0,80.0,
 368                               75.0,70.0,60.0,50.0,40.0,30.0,
 369                               25.0,20.0,10.0,9.0,8.0,
 370                               7.0,6.0,5.0,4.0,3.5,3.0,
 371                               2.5,2.0,1.8,1.5,1.2,1.0,
 372                               0.8,0.7,0.6,0.5,0.4,0.3,0.2,0.1,0.0,-1};
 373
 374     double scaled_min,scaled_max;
 375     double adj;
 376     int i;
 377
 378
 379
 380 #ifdef DEBUG
 381     printf("Min: %6.2f Max: %6.2f MagFactor: %6.2f\n",
 382            im->minval,im->maxval,im->magfact);
 383 #endif
 384
 385     if (isnan(im->ygridstep)){
 386         if(im->extra_flags & ALTAUTOSCALE) {
 387             /* measure the amplitude of the function. Make sure that
 388                graph boundaries are slightly higher then max/min vals
 389                so we can see amplitude on the graph */
 390               double delt, fact;
 391
 392               delt = im->maxval - im->minval;
 393               adj = delt * 0.1;
 394               fact = 2.0 * pow(10.0,
 395                     floor(log10(max(fabs(im->minval), fabs(im->maxval)))) - 2);
 396               if (delt < fact) {
 397                 adj = (fact - delt) * 0.55;
 398 #ifdef DEBUG
 399               printf("Min: %6.2f Max: %6.2f delt: %6.2f fact: %6.2f adj: %6.2f\n", im->minval, im->maxval, delt, fact, adj);
 400 #endif
 401               }
 402               im->minval -= adj;
 403               im->maxval += adj;
 404         }
 405         else if(im->extra_flags & ALTAUTOSCALE_MAX) {
 406             /* measure the amplitude of the function. Make sure that
 407                graph boundaries are slightly higher than max vals
 408                so we can see amplitude on the graph */
 409               adj = (im->maxval - im->minval) * 0.1;
 410               im->maxval += adj;
 411         }
 412         else {
 413             scaled_min = im->minval / im->magfact;
 414             scaled_max = im->maxval / im->magfact;
 415
 416             for (i=1; sensiblevalues[i] > 0; i++){
 417                 if (sensiblevalues[i-1]>=scaled_min &&
 418                     sensiblevalues[i]<=scaled_min)
 419                     im->minval = sensiblevalues[i]*(im->magfact);
 420
 421                 if (-sensiblevalues[i-1]<=scaled_min &&
 422                 -sensiblevalues[i]>=scaled_min)
 423                     im->minval = -sensiblevalues[i-1]*(im->magfact);
 424
 425                 if (sensiblevalues[i-1] >= scaled_max &&
 426                     sensiblevalues[i] <= scaled_max)
 427                     im->maxval = sensiblevalues[i-1]*(im->magfact);
 428
 429                 if (-sensiblevalues[i-1]<=scaled_max &&
 430                     -sensiblevalues[i] >=scaled_max)
 431                     im->maxval = -sensiblevalues[i]*(im->magfact);
 432             }
 433             /* no sensiblevalues found. we switch to ALTYGRID mode */
 434             if (sensiblevalues[i] == 0){
 435                 im->extra_flags |= ALTYGRID;
 436             }
 437         }
 438     } else {
 439         /* adjust min and max to the grid definition if there is one */
 440         im->minval = (double)im->ylabfact * im->ygridstep *
 441             floor(im->minval / ((double)im->ylabfact * im->ygridstep));
 442         im->maxval = (double)im->ylabfact * im->ygridstep *
 443             ceil(im->maxval /( (double)im->ylabfact * im->ygridstep));
 444     }
 445
 446 #ifdef DEBUG
 447     fprintf(stderr,"SCALED Min: %6.2f Max: %6.2f Factor: %6.2f\n",
 448            im->minval,im->maxval,im->magfact);
 449 #endif
 450 }
 451
 452 void
 453 apply_gridfit(image_desc_t *im)
 454 {
 455   if (isnan(im->minval) || isnan(im->maxval))
 456     return;
 457   ytr(im,DNAN);
 458   if (im->logarithmic) {
 459     double ya, yb, ypix, ypixfrac;
 460     double log10_range = log10(im->maxval) - log10(im->minval);
 461     ya = pow((double)10, floor(log10(im->minval)));
 462     while (ya < im->minval)
 463       ya *= 10;
 464     if (ya > im->maxval)
 465       return; /* don't have y=10^x gridline */
 466     yb = ya * 10;
 467     if (yb <= im->maxval) {
 468       /* we have at least 2 y=10^x gridlines.
 469          Make sure distance between them in pixels
 470          are an integer by expanding im->maxval */
 471       double y_pixel_delta = ytr(im, ya) - ytr(im, yb);
 472       double factor = y_pixel_delta / floor(y_pixel_delta);
 473       double new_log10_range = factor * log10_range;
 474       double new_ymax_log10 = log10(im->minval) + new_log10_range;
 475       im->maxval = pow(10, new_ymax_log10);
 476       ytr(im, DNAN); /* reset precalc */
 477       log10_range = log10(im->maxval) - log10(im->minval);
 478     }
 479     /* make sure first y=10^x gridline is located on
 480        integer pixel position by moving scale slightly
 481        downwards (sub-pixel movement) */
 482     ypix = ytr(im, ya) + im->ysize; /* add im->ysize so it always is positive */
 483     ypixfrac = ypix - floor(ypix);
 484     if (ypixfrac > 0 && ypixfrac < 1) {
 485       double yfrac = ypixfrac / im->ysize;
 486       im->minval = pow(10, log10(im->minval) - yfrac * log10_range);
 487       im->maxval = pow(10, log10(im->maxval) - yfrac * log10_range);
 488       ytr(im, DNAN); /* reset precalc */
 489     }
 490   } else {
 491     /* Make sure we have an integer pixel distance between
 492        each minor gridline */
 493     double ypos1 = ytr(im, im->minval);
 494     double ypos2 = ytr(im, im->minval + im->ygrid_scale.gridstep);
 495     double y_pixel_delta = ypos1 - ypos2;
 496     double factor = y_pixel_delta / floor(y_pixel_delta);
 497     double new_range = factor * (im->maxval - im->minval);
 498     double gridstep = im->ygrid_scale.gridstep;
 499     double minor_y, minor_y_px, minor_y_px_frac;
 500     im->maxval = im->minval + new_range;
 501     ytr(im, DNAN); /* reset precalc */
 502     /* make sure first minor gridline is on integer pixel y coord */
 503     minor_y = gridstep * floor(im->minval / gridstep);
 504     while (minor_y < im->minval)
 505       minor_y += gridstep;
 506     minor_y_px = ytr(im, minor_y) + im->ysize; /* ensure > 0 by adding ysize */
 507     minor_y_px_frac = minor_y_px - floor(minor_y_px);
 508     if (minor_y_px_frac > 0 && minor_y_px_frac < 1) {
 509       double yfrac = minor_y_px_frac / im->ysize;
 510       double range = im->maxval - im->minval;
 511       im->minval = im->minval - yfrac * range;
 512       im->maxval = im->maxval - yfrac * range;
 513       ytr(im, DNAN); /* reset precalc */
 514     }
 515     calc_horizontal_grid(im); /* recalc with changed im->maxval */
 516   }
 517 }
 518
 519 /* reduce data reimplementation by Alex */
 520
 521 void
 522 reduce_data(
 523     enum cf_en     cf,         /* which consolidation function ?*/
 524     unsigned long  cur_step,   /* step the data currently is in */
 525     time_t         *start,     /* start, end and step as requested ... */
 526     time_t         *end,       /* ... by the application will be   ... */
 527     unsigned long  *step,      /* ... adjusted to represent reality    */
 528     unsigned long  *ds_cnt,    /* number of data sources in file */
 529     rrd_value_t    **data)     /* two dimensional array containing the data */
 530 {
 531     int i,reduce_factor = ceil((double)(*step) / (double)cur_step);
 532     unsigned long col,dst_row,row_cnt,start_offset,end_offset,skiprows=0;
 533     rrd_value_t    *srcptr,*dstptr;
 534
 535     (*step) = cur_step*reduce_factor; /* set new step size for reduced data */
 536     dstptr = *data;
 537     srcptr = *data;
 538     row_cnt = ((*end)-(*start))/cur_step;
 539
 540 #ifdef DEBUG
 541 #define DEBUG_REDUCE
 542 #endif
 543 #ifdef DEBUG_REDUCE
 544 printf("Reducing %lu rows with factor %i time %lu to %lu, step %lu\n",
 545                         row_cnt,reduce_factor,*start,*end,cur_step);
 546 for (col=0;col<row_cnt;col++) {
 547     printf("time %10lu: ",*start+(col+1)*cur_step);
 548     for (i=0;i<*ds_cnt;i++)
 549         printf(" %8.2e",srcptr[*ds_cnt*col+i]);
 550     printf("\n");
 551 }
 552 #endif
 553
 554     /* We have to combine [reduce_factor] rows of the source
 555     ** into one row for the destination.  Doing this we also
 556     ** need to take care to combine the correct rows.  First
 557     ** alter the start and end time so that they are multiples
 558     ** of the new step time.  We cannot reduce the amount of
 559     ** time so we have to move the end towards the future and
 560     ** the start towards the past.
 561     */
 562     end_offset = (*end) % (*step);
 563     start_offset = (*start) % (*step);
 564
 565     /* If there is a start offset (which cannot be more than
 566     ** one destination row), skip the appropriate number of
 567     ** source rows and one destination row.  The appropriate
 568     ** number is what we do know (start_offset/cur_step) of
 569     ** the new interval (*step/cur_step aka reduce_factor).
 570     */
 571 #ifdef DEBUG_REDUCE
 572 printf("start_offset: %lu  end_offset: %lu\n",start_offset,end_offset);
 573 printf("row_cnt before:  %lu\n",row_cnt);
 574 #endif
 575     if (start_offset) {
 576         (*start) = (*start)-start_offset;
 577         skiprows=reduce_factor-start_offset/cur_step;
 578         srcptr+=skiprows* *ds_cnt;
 579         for (col=0;col<(*ds_cnt);col++) *dstptr++ = DNAN;
 580         row_cnt-=skiprows;
 581     }
 582 #ifdef DEBUG_REDUCE
 583 printf("row_cnt between: %lu\n",row_cnt);
 584 #endif
 585
 586     /* At the end we have some rows that are not going to be
 587     ** used, the amount is end_offset/cur_step
 588     */
 589     if (end_offset) {
 590         (*end) = (*end)-end_offset+(*step);
 591         skiprows = end_offset/cur_step;
 592         row_cnt-=skiprows;
 593     }
 594 #ifdef DEBUG_REDUCE
 595 printf("row_cnt after:   %lu\n",row_cnt);
 596 #endif
 597
 598 /* Sanity check: row_cnt should be multiple of reduce_factor */
 599 /* if this gets triggered, something is REALLY WRONG ... we die immediately */
 600
 601     if (row_cnt%reduce_factor) {
 602         printf("SANITY CHECK: %lu rows cannot be reduced by %i \n",
 603                                 row_cnt,reduce_factor);
 604         printf("BUG in reduce_data()\n");
 605         exit(1);
 606     }
 607
 608     /* Now combine reduce_factor intervals at a time
 609     ** into one interval for the destination.
 610     */
 611
 612     for (dst_row=0;(long int)row_cnt>=reduce_factor;dst_row++) {
 613         for (col=0;col<(*ds_cnt);col++) {
 614             rrd_value_t newval=DNAN;
 615             unsigned long validval=0;
 616
 617             for (i=0;i<reduce_factor;i++) {
 618                 if (isnan(srcptr[i*(*ds_cnt)+col])) {
 619                     continue;
 620                 }
 621                 validval++;
 622                 if (isnan(newval)) newval = srcptr[i*(*ds_cnt)+col];
 623                 else {
 624                     switch (cf) {
 625                         case CF_HWPREDICT:
 626                         case CF_DEVSEASONAL:
 627                         case CF_DEVPREDICT:
 628                         case CF_SEASONAL:
 629                         case CF_AVERAGE:
 630                             newval += srcptr[i*(*ds_cnt)+col];
 631                             break;
 632                         case CF_MINIMUM:
 633                             newval = min (newval,srcptr[i*(*ds_cnt)+col]);
 634                             break;
 635                         case CF_FAILURES:
 636                         /* an interval contains a failure if any subintervals contained a failure */
 637                         case CF_MAXIMUM:
 638                             newval = max (newval,srcptr[i*(*ds_cnt)+col]);
 639                             break;
 640                         case CF_LAST:
 641                             newval = srcptr[i*(*ds_cnt)+col];
 642                             break;
 643                     }
 644                 }
 645             }
 646             if (validval == 0){newval = DNAN;} else{
 647                 switch (cf) {
 648                     case CF_HWPREDICT:
 649             case CF_DEVSEASONAL:
 650                     case CF_DEVPREDICT:
 651                     case CF_SEASONAL:
 652                     case CF_AVERAGE:
 653                        newval /= validval;
 654                         break;
 655                     case CF_MINIMUM:
 656                     case CF_FAILURES:
 657                     case CF_MAXIMUM:
 658                     case CF_LAST:
 659                         break;
 660                 }
 661             }
 662             *dstptr++=newval;
 663         }
 664         srcptr+=(*ds_cnt)*reduce_factor;
 665         row_cnt-=reduce_factor;
 666     }
 667     /* If we had to alter the endtime, we didn't have enough
 668     ** source rows to fill the last row. Fill it with NaN.
 669     */
 670     if (end_offset) for (col=0;col<(*ds_cnt);col++) *dstptr++ = DNAN;
 671 #ifdef DEBUG_REDUCE
 672     row_cnt = ((*end)-(*start))/ *step;
 673     srcptr = *data;
 674     printf("Done reducing. Currently %lu rows, time %lu to %lu, step %lu\n",
 675                                 row_cnt,*start,*end,*step);
 676 for (col=0;col<row_cnt;col++) {
 677     printf("time %10lu: ",*start+(col+1)*(*step));
 678     for (i=0;i<*ds_cnt;i++)
 679         printf(" %8.2e",srcptr[*ds_cnt*col+i]);
 680     printf("\n");
 681 }
 682 #endif
 683 }
 684
 685
 686 /* get the data required for the graphs from the
 687    relevant rrds ... */
 688
 689 int
 690 data_fetch(image_desc_t *im )
 691 {
 692     int i,ii;
 693     int         skip;
 694
 695     /* pull the data from the log files ... */
 696     for (i=0;i< (int)im->gdes_c;i++){
 697         /* only GF_DEF elements fetch data */
 698         if (im->gdes[i].gf != GF_DEF)
 699             continue;
 700
 701         skip=0;
 702         /* do we have it already ?*/
 703         for (ii=0;ii<i;ii++) {
 704             if (im->gdes[ii].gf != GF_DEF)
 705                 continue;
 706             if ((strcmp(im->gdes[i].rrd, im->gdes[ii].rrd) == 0)
 707                         && (im->gdes[i].cf    == im->gdes[ii].cf)
 708                         && (im->gdes[i].cf_reduce == im->gdes[ii].cf_reduce)
 709                         && (im->gdes[i].start == im->gdes[ii].start)
 710                         && (im->gdes[i].end   == im->gdes[ii].end)
 711                         && (im->gdes[i].step  == im->gdes[ii].step)) {
 712                 /* OK, the data is already there.
 713                 ** Just copy the header portion
 714                 */
 715                 im->gdes[i].start = im->gdes[ii].start;
 716                 im->gdes[i].end = im->gdes[ii].end;
 717                 im->gdes[i].step = im->gdes[ii].step;
 718                 im->gdes[i].ds_cnt = im->gdes[ii].ds_cnt;
 719                 im->gdes[i].ds_namv = im->gdes[ii].ds_namv;
 720                 im->gdes[i].data = im->gdes[ii].data;
 721                 im->gdes[i].data_first = 0;
 722                 skip=1;
 723             }
 724             if (skip)
 725                 break;
 726         }
 727         if (! skip) {
 728             unsigned long  ft_step = im->gdes[i].step ;
 729
 730             if((rrd_fetch_fn(im->gdes[i].rrd,
 731                              im->gdes[i].cf,
 732                              &im->gdes[i].start,
 733                              &im->gdes[i].end,
 734                              &ft_step,
 735                              &im->gdes[i].ds_cnt,
 736                              &im->gdes[i].ds_namv,
 737                              &im->gdes[i].data)) == -1){
 738                 return -1;
 739             }
 740             im->gdes[i].data_first = 1;
 741             im->gdes[i].step = im->step;
 742
 743             if (ft_step < im->gdes[i].step) {
 744                 reduce_data(im->gdes[i].cf_reduce,
 745                             ft_step,
 746                             &im->gdes[i].start,
 747                             &im->gdes[i].end,
 748                             &im->gdes[i].step,
 749                             &im->gdes[i].ds_cnt,
 750                             &im->gdes[i].data);
 751             } else {
 752                 im->gdes[i].step = ft_step;
 753             }
 754         }
 755
 756         /* lets see if the required data source is really there */
 757         for(ii=0;ii<(int)im->gdes[i].ds_cnt;ii++){
 758             if(strcmp(im->gdes[i].ds_namv[ii],im->gdes[i].ds_nam) == 0){
 759                 im->gdes[i].ds=ii; }
 760         }
 761         if (im->gdes[i].ds== -1){
 762             rrd_set_error("No DS called '%s' in '%s'",
 763                           im->gdes[i].ds_nam,im->gdes[i].rrd);
 764             return -1;
 765         }
 766
 767     }
 768     return 0;
 769 }
 770
 771 /* evaluate the expressions in the CDEF functions */
 772
 773 /*************************************************************
 774  * CDEF stuff
 775  *************************************************************/
 776
 777 long
 778 find_var_wrapper(void *arg1, char *key)
 779 {
 780    return find_var((image_desc_t *) arg1, key);
 781 }
 782
 783 /* find gdes containing var*/
 784 long
 785 find_var(image_desc_t *im, char *key){
 786     long ii;
 787     for(ii=0;ii<im->gdes_c-1;ii++){
 788         if((im->gdes[ii].gf == GF_DEF
 789             || im->gdes[ii].gf == GF_VDEF
 790             || im->gdes[ii].gf == GF_CDEF)
 791            && (strcmp(im->gdes[ii].vname,key) == 0)){
 792             return ii;
 793         }
 794     }
 795     return -1;
 796 }
 797
 798 /* find the largest common denominator for all the numbers
 799    in the 0 terminated num array */
 800 long
 801 lcd(long *num){
 802     long rest;
 803     int i;
 804     for (i=0;num[i+1]!=0;i++){
 805         do {
 806             rest=num[i] % num[i+1];
 807             num[i]=num[i+1]; num[i+1]=rest;
 808         } while (rest!=0);
 809         num[i+1] = num[i];
 810     }
 811 /*    return i==0?num[i]:num[i-1]; */
 812       return num[i];
 813 }
 814
 815 /* run the rpn calculator on all the VDEF and CDEF arguments */
 816 int
 817 data_calc( image_desc_t *im){
 818
 819     int       gdi;
 820     int       dataidx;
 821     long      *steparray, rpi;
 822     int       stepcnt;
 823     time_t    now;
 824     rpnstack_t rpnstack;
 825
 826     rpnstack_init(&rpnstack);
 827
 828     for (gdi=0;gdi<im->gdes_c;gdi++){
 829         /* Look for GF_VDEF and GF_CDEF in the same loop,
 830          * so CDEFs can use VDEFs and vice versa
 831          */
 832         switch (im->gdes[gdi].gf) {
 833             case GF_XPORT:
 834               break;
 835             case GF_SHIFT: {
 836                 graph_desc_t    *vdp = &im->gdes[im->gdes[gdi].vidx];
 837
 838                 /* remove current shift */
 839                 vdp->start -= vdp->shift;
 840                 vdp->end -= vdp->shift;
 841
 842                 /* vdef */
 843                 if (im->gdes[gdi].shidx >= 0)
 844                         vdp->shift = im->gdes[im->gdes[gdi].shidx].vf.val;
 845                 /* constant */
 846                 else
 847                         vdp->shift = im->gdes[gdi].shval;
 848
 849                 /* normalize shift to multiple of consolidated step */
 850                 vdp->shift = (vdp->shift / (long)vdp->step) * (long)vdp->step;
 851
 852                 /* apply shift */
 853                 vdp->start += vdp->shift;
 854                 vdp->end += vdp->shift;
 855                 break;
 856             }
 857             case GF_VDEF:
 858                 /* A VDEF has no DS.  This also signals other parts
 859                  * of rrdtool that this is a VDEF value, not a CDEF.
 860                  */
 861                 im->gdes[gdi].ds_cnt = 0;
 862                 if (vdef_calc(im,gdi)) {
 863                     rrd_set_error("Error processing VDEF '%s'"
 864                         ,im->gdes[gdi].vname
 865                         );
 866                     rpnstack_free(&rpnstack);
 867                     return -1;
 868                 }
 869                 break;
 870             case GF_CDEF:
 871                 im->gdes[gdi].ds_cnt = 1;
 872                 im->gdes[gdi].ds = 0;
 873                 im->gdes[gdi].data_first = 1;
 874                 im->gdes[gdi].start = 0;
 875                 im->gdes[gdi].end = 0;
 876                 steparray=NULL;
 877                 stepcnt = 0;
 878                 dataidx=-1;
 879
 880                 /* Find the variables in the expression.
 881                  * - VDEF variables are substituted by their values
 882                  *   and the opcode is changed into OP_NUMBER.
 883                  * - CDEF variables are analized for their step size,
 884                  *   the lowest common denominator of all the step
 885                  *   sizes of the data sources involved is calculated
 886                  *   and the resulting number is the step size for the
 887                  *   resulting data source.
 888                  */
 889                 for(rpi=0;im->gdes[gdi].rpnp[rpi].op != OP_END;rpi++){
 890                 if(im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
 891                    im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER){
 892                         long ptr = im->gdes[gdi].rpnp[rpi].ptr;
 893                         if (im->gdes[ptr].ds_cnt == 0) {
 894 #if 0
 895                         printf("DEBUG: inside CDEF '%s' processing VDEF '%s'\n",
 896         im->gdes[gdi].vname,
 897         im->gdes[ptr].vname);
 898                         printf("DEBUG: value from vdef is %f\n",im->gdes[ptr].vf.val);
 899 #endif
 900                             im->gdes[gdi].rpnp[rpi].val = im->gdes[ptr].vf.val;
 901                             im->gdes[gdi].rpnp[rpi].op  = OP_NUMBER;
 902                         } else {
 903                         if ((steparray =
 904                                  rrd_realloc(steparray,
 905                                                          (++stepcnt+1)*sizeof(*steparray)))==NULL){
 906                                 rrd_set_error("realloc steparray");
 907                                 rpnstack_free(&rpnstack);
 908                                 return -1;
 909                             };
 910
 911                             steparray[stepcnt-1] = im->gdes[ptr].step;
 912
 913                             /* adjust start and end of cdef (gdi) so
 914                              * that it runs from the latest start point
 915                              * to the earliest endpoint of any of the
 916                              * rras involved (ptr)
 917                              */
 918                             if(im->gdes[gdi].start < im->gdes[ptr].start)
 919                                 im->gdes[gdi].start = im->gdes[ptr].start;
 920
 921                             if(im->gdes[gdi].end == 0 ||
 922                                         im->gdes[gdi].end > im->gdes[ptr].end)
 923                                 im->gdes[gdi].end = im->gdes[ptr].end;
 924
 925                             /* store pointer to the first element of
 926                              * the rra providing data for variable,
 927                              * further save step size and data source
 928                              * count of this rra
 929                              */
 930                             im->gdes[gdi].rpnp[rpi].data =  im->gdes[ptr].data + im->gdes[ptr].ds;
 931                             im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
 932                             im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
 933
 934                             /* backoff the *.data ptr; this is done so
 935                              * rpncalc() function doesn't have to treat
 936                              * the first case differently
 937                              */
 938                         } /* if ds_cnt != 0 */
 939                     } /* if OP_VARIABLE */
 940                 } /* loop through all rpi */
 941
 942                 /* move the data pointers to the correct period */
 943                 for(rpi=0;im->gdes[gdi].rpnp[rpi].op != OP_END;rpi++){
 944                 if(im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
 945                    im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER){
 946                         long ptr = im->gdes[gdi].rpnp[rpi].ptr;
 947                         long diff = im->gdes[gdi].start - im->gdes[ptr].start;
 948
 949                         if(diff > 0)
 950                             im->gdes[gdi].rpnp[rpi].data += (diff / im->gdes[ptr].step) * im->gdes[ptr].ds_cnt;
 951                      }
 952                 }
 953
 954                 if(steparray == NULL){
 955                     rrd_set_error("rpn expressions without DEF"
 956                                 " or CDEF variables are not supported");
 957                     rpnstack_free(&rpnstack);
 958                     return -1;
 959                 }
 960                 steparray[stepcnt]=0;
 961                 /* Now find the resulting step.  All steps in all
 962                  * used RRAs have to be visited
 963                  */
 964                 im->gdes[gdi].step = lcd(steparray);
 965                 free(steparray);
 966                 if((im->gdes[gdi].data = malloc((
 967                                 (im->gdes[gdi].end-im->gdes[gdi].start)
 968                                     / im->gdes[gdi].step)
 969                                     * sizeof(double)))==NULL){
 970                     rrd_set_error("malloc im->gdes[gdi].data");
 971                     rpnstack_free(&rpnstack);
 972                     return -1;
 973                 }
 974
 975                 /* Step through the new cdef results array and
 976                  * calculate the values
 977                  */
 978                 for (now = im->gdes[gdi].start + im->gdes[gdi].step;
 979                                 now<=im->gdes[gdi].end;
 980                                 now += im->gdes[gdi].step)
 981                 {
 982                     rpnp_t  *rpnp = im -> gdes[gdi].rpnp;
 983
 984                     /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
 985                      * in this case we are advancing by timesteps;
 986                      * we use the fact that time_t is a synonym for long
 987                      */
 988                     if (rpn_calc(rpnp,&rpnstack,(long) now,
 989                                 im->gdes[gdi].data,++dataidx) == -1) {
 990                         /* rpn_calc sets the error string */
 991                         rpnstack_free(&rpnstack);
 992                         return -1;
 993                     }
 994                 } /* enumerate over time steps within a CDEF */
 995                 break;
 996             default:
 997                 continue;
 998         }
 999     } /* enumerate over CDEFs */
1000     rpnstack_free(&rpnstack);
1001     return 0;
1002 }
1003
1004 /* massage data so, that we get one value for each x coordinate in the graph */
1005 int
1006 data_proc( image_desc_t *im ){
1007     long i,ii;
1008     double pixstep = (double)(im->end-im->start)
1009         /(double)im->xsize; /* how much time
1010                                passes in one pixel */
1011     double paintval;
1012     double minval=DNAN,maxval=DNAN;
1013
1014     unsigned long gr_time;
1015
1016     /* memory for the processed data */
1017     for(i=0;i<im->gdes_c;i++) {
1018         if((im->gdes[i].gf==GF_LINE) ||
1019                 (im->gdes[i].gf==GF_AREA) ||
1020                 (im->gdes[i].gf==GF_TICK) ||
1021                 (im->gdes[i].gf==GF_STACK)) {
1022             if((im->gdes[i].p_data = malloc((im->xsize +1)
1023                                         * sizeof(rrd_value_t)))==NULL){
1024                 rrd_set_error("malloc data_proc");
1025                 return -1;
1026             }
1027         }
1028     }
1029
1030     for (i=0;i<im->xsize;i++) { /* for each pixel */
1031         long vidx;
1032         gr_time = im->start+pixstep*i; /* time of the current step */
1033         paintval=0.0;
1034
1035         for (ii=0;ii<im->gdes_c;ii++) {
1036             double value;
1037             switch (im->gdes[ii].gf) {
1038                 case GF_LINE:
1039                 case GF_AREA:
1040                 case GF_TICK:
1041                     if (!im->gdes[ii].stack)
1042                         paintval = 0.0;
1043                 case GF_STACK:
1044                     value = im->gdes[ii].yrule;
1045                     if (isnan(value) || (im->gdes[ii].gf == GF_TICK)) {
1046                         /* The time of the data doesn't necessarily match
1047                         ** the time of the graph. Beware.
1048                         */
1049                         vidx = im->gdes[ii].vidx;
1050                         if (im->gdes[vidx].gf == GF_VDEF) {
1051                             value = im->gdes[vidx].vf.val;
1052                         } else if (((long int)gr_time >= (long int)im->gdes[vidx].start) &&
1053                                    ((long int)gr_time <= (long int)im->gdes[vidx].end) ) {
1054                             value = im->gdes[vidx].data[
1055                                 (unsigned long) floor(
1056                                     (double)(gr_time - im->gdes[vidx].start)
1057                                                 / im->gdes[vidx].step)
1058                                 * im->gdes[vidx].ds_cnt
1059                                 + im->gdes[vidx].ds
1060                             ];
1061                         } else {
1062                             value = DNAN;
1063                         }
1064                     };
1065
1066                     if (! isnan(value)) {
1067                         paintval += value;
1068                         im->gdes[ii].p_data[i] = paintval;
1069                         /* GF_TICK: the data values are not
1070                         ** relevant for min and max
1071                         */
1072                         if (finite(paintval) && im->gdes[ii].gf != GF_TICK ) {
1073                             if (isnan(minval) || paintval <  minval)
1074                                 minval = paintval;
1075                             if (isnan(maxval) || paintval >  maxval)
1076                                 maxval = paintval;
1077                         }
1078                     } else {
1079                         im->gdes[ii].p_data[i] = DNAN;
1080                     }
1081                     break;
1082                 default:
1083                     break;
1084             }
1085         }
1086     }
1087
1088     /* if min or max have not been asigned a value this is because
1089        there was no data in the graph ... this is not good ...
1090        lets set these to dummy values then ... */
1091
1092     if (isnan(minval)) minval = 0.0;
1093     if (isnan(maxval)) maxval = 1.0;
1094
1095     /* adjust min and max values */
1096     if (isnan(im->minval)
1097         /* don't adjust low-end with log scale */
1098         || ((!im->logarithmic && !im->rigid) && im->minval > minval)
1099         )
1100         im->minval = minval;
1101     if (isnan(im->maxval)
1102         || (!im->rigid && im->maxval < maxval)
1103         ) {
1104         if (im->logarithmic)
1105             im->maxval = maxval * 1.1;
1106         else
1107             im->maxval = maxval;
1108     }
1109     /* make sure min is smaller than max */
1110     if (im->minval > im->maxval) {
1111             im->minval = 0.99 * im->maxval;
1112     }
1113
1114     /* make sure min and max are not equal */
1115     if (im->minval == im->maxval) {
1116         im->maxval *= 1.01;
1117         if (! im->logarithmic) {
1118             im->minval *= 0.99;
1119         }
1120         /* make sure min and max are not both zero */
1121         if (im->maxval == 0.0) {
1122             im->maxval = 1.0;
1123         }
1124     }
1125     return 0;
1126 }
1127
1128
1129
1130 /* identify the point where the first gridline, label ... gets placed */
1131
1132 time_t
1133 find_first_time(
1134     time_t   start, /* what is the initial time */
1135     enum tmt_en baseint,  /* what is the basic interval */
1136     long     basestep /* how many if these do we jump a time */
1137     )
1138 {
1139     struct tm tm;
1140     localtime_r(&start, &tm);
1141     switch(baseint){
1142     case TMT_SECOND:
1143         tm.tm_sec -= tm.tm_sec % basestep; break;
1144     case TMT_MINUTE:
1145         tm.tm_sec=0;
1146         tm.tm_min -= tm.tm_min % basestep;
1147         break;
1148     case TMT_HOUR:
1149         tm.tm_sec=0;
1150         tm.tm_min = 0;
1151         tm.tm_hour -= tm.tm_hour % basestep; break;
1152     case TMT_DAY:
1153         /* we do NOT look at the basestep for this ... */
1154         tm.tm_sec=0;
1155         tm.tm_min = 0;
1156         tm.tm_hour = 0; break;
1157     case TMT_WEEK:
1158         /* we do NOT look at the basestep for this ... */
1159         tm.tm_sec=0;
1160         tm.tm_min = 0;
1161         tm.tm_hour = 0;
1162         tm.tm_mday -= tm.tm_wday -1;    /* -1 because we want the monday */
1163         if (tm.tm_wday==0) tm.tm_mday -= 7; /* we want the *previous* monday */
1164         break;
1165     case TMT_MONTH:
1166         tm.tm_sec=0;
1167         tm.tm_min = 0;
1168         tm.tm_hour = 0;
1169         tm.tm_mday = 1;
1170         tm.tm_mon -= tm.tm_mon % basestep; break;
1171
1172     case TMT_YEAR:
1173         tm.tm_sec=0;
1174         tm.tm_min = 0;
1175         tm.tm_hour = 0;
1176         tm.tm_mday = 1;
1177         tm.tm_mon = 0;
1178         tm.tm_year -= (tm.tm_year+1900) % basestep;
1179
1180     }
1181     return mktime(&tm);
1182 }
1183 /* identify the point where the next gridline, label ... gets placed */
1184 time_t
1185 find_next_time(
1186     time_t   current, /* what is the initial time */
1187     enum tmt_en baseint,  /* what is the basic interval */
1188     long     basestep /* how many if these do we jump a time */
1189     )
1190 {
1191     struct tm tm;
1192     time_t madetime;
1193     localtime_r(&current, &tm);
1194     do {
1195         switch(baseint){
1196         case TMT_SECOND:
1197             tm.tm_sec += basestep; break;
1198         case TMT_MINUTE:
1199             tm.tm_min += basestep; break;
1200         case TMT_HOUR:
1201             tm.tm_hour += basestep; break;
1202         case TMT_DAY:
1203             tm.tm_mday += basestep; break;
1204         case TMT_WEEK:
1205             tm.tm_mday += 7*basestep; break;
1206         case TMT_MONTH:
1207             tm.tm_mon += basestep; break;
1208         case TMT_YEAR:
1209             tm.tm_year += basestep;
1210         }
1211         madetime = mktime(&tm);
1212     } while (madetime == -1); /* this is necessary to skip impssible times
1213                                  like the daylight saving time skips */
1214     return madetime;
1215
1216 }
1217
1218
1219 /* calculate values required for PRINT and GPRINT functions */
1220
1221 int
1222 print_calc(image_desc_t *im, char ***prdata)
1223 {
1224     long i,ii,validsteps;
1225     double printval;
1226     time_t printtime;
1227     int graphelement = 0;
1228     long vidx;
1229     int max_ii;
1230     double magfact = -1;
1231     char *si_symb = "";
1232     char *percent_s;
1233     int prlines = 1;
1234     if (im->imginfo) prlines++;
1235     for(i=0;i<im->gdes_c;i++){
1236         switch(im->gdes[i].gf){
1237         case GF_PRINT:
1238             prlines++;
1239             if(((*prdata) = rrd_realloc((*prdata),prlines*sizeof(char *)))==NULL){
1240                 rrd_set_error("realloc prdata");
1241                 return 0;
1242             }
1243         case GF_GPRINT:
1244             /* PRINT and GPRINT can now print VDEF generated values.
1245              * There's no need to do any calculations on them as these
1246              * calculations were already made.
1247              */
1248             vidx = im->gdes[i].vidx;
1249             if (im->gdes[vidx].gf==GF_VDEF) { /* simply use vals */
1250                 printval = im->gdes[vidx].vf.val;
1251                 printtime = im->gdes[vidx].vf.when;
1252             } else { /* need to calculate max,min,avg etcetera */
1253                 max_ii =((im->gdes[vidx].end
1254                         - im->gdes[vidx].start)
1255                         / im->gdes[vidx].step
1256                         * im->gdes[vidx].ds_cnt);
1257                 printval = DNAN;
1258                 validsteps = 0;
1259                 for(    ii=im->gdes[vidx].ds;
1260                         ii < max_ii;
1261                         ii+=im->gdes[vidx].ds_cnt){
1262                     if (! finite(im->gdes[vidx].data[ii]))
1263                         continue;
1264                     if (isnan(printval)){
1265                         printval = im->gdes[vidx].data[ii];
1266                         validsteps++;
1267                         continue;
1268                     }
1269
1270                     switch (im->gdes[i].cf){
1271                         case CF_HWPREDICT:
1272                         case CF_DEVPREDICT:
1273                         case CF_DEVSEASONAL:
1274                         case CF_SEASONAL:
1275                         case CF_AVERAGE:
1276                             validsteps++;
1277                             printval += im->gdes[vidx].data[ii];
1278                             break;
1279                         case CF_MINIMUM:
1280                             printval = min( printval, im->gdes[vidx].data[ii]);
1281                             break;
1282                         case CF_FAILURES:
1283                         case CF_MAXIMUM:
1284                             printval = max( printval, im->gdes[vidx].data[ii]);
1285                             break;
1286                         case CF_LAST:
1287                             printval = im->gdes[vidx].data[ii];
1288                     }
1289                 }
1290                 if (im->gdes[i].cf==CF_AVERAGE || im->gdes[i].cf > CF_LAST) {
1291                     if (validsteps > 1) {
1292                         printval = (printval / validsteps);
1293                     }
1294                 }
1295             } /* prepare printval */
1296
1297             if (!strcmp(im->gdes[i].format,"%c")) { /* VDEF time print */
1298                 char ctime_buf[128]; /* PS: for ctime_r, must be >= 26 chars */
1299                 int iii=0;
1300                 ctime_r(&printtime,ctime_buf);
1301                 while(isprint(ctime_buf[iii])){iii++;}
1302                 ctime_buf[iii]='\0';
1303                 if (im->gdes[i].gf == GF_PRINT){
1304                     (*prdata)[prlines-2] = malloc((FMT_LEG_LEN+2)*sizeof(char));
1305                     sprintf((*prdata)[prlines-2],"%s (%lu)",ctime_buf,printtime);
1306                     (*prdata)[prlines-1] = NULL;
1307                 } else {
1308                     sprintf(im->gdes[i].legend,"%s (%lu)",ctime_buf,printtime);
1309                     graphelement = 1;
1310                 }
1311             } else {
1312             if ((percent_s = strstr(im->gdes[i].format,"%S")) != NULL) {
1313                 /* Magfact is set to -1 upon entry to print_calc.  If it
1314                  * is still less than 0, then we need to run auto_scale.
1315                  * Otherwise, put the value into the correct units.  If
1316                  * the value is 0, then do not set the symbol or magnification
1317                  * so next the calculation will be performed again. */
1318                 if (magfact < 0.0) {
1319                     auto_scale(im,&printval,&si_symb,&magfact);
1320                     if (printval == 0.0)
1321                         magfact = -1.0;
1322                 } else {
1323                     printval /= magfact;
1324                 }
1325                 *(++percent_s) = 's';
1326             } else if (strstr(im->gdes[i].format,"%s") != NULL) {
1327                 auto_scale(im,&printval,&si_symb,&magfact);
1328             }
1329
1330             if (im->gdes[i].gf == GF_PRINT){
1331                 (*prdata)[prlines-2] = malloc((FMT_LEG_LEN+2)*sizeof(char));
1332                 (*prdata)[prlines-1] = NULL;
1333                 if (bad_format(im->gdes[i].format)) {
1334                         rrd_set_error("bad format for PRINT in '%s'", im->gdes[i].format);
1335                         return -1;
1336                 }
1337 #ifdef HAVE_SNPRINTF
1338                 snprintf((*prdata)[prlines-2],FMT_LEG_LEN,im->gdes[i].format,printval,si_symb);
1339 #else
1340                 sprintf((*prdata)[prlines-2],im->gdes[i].format,printval,si_symb);
1341 #endif
1342             } else {
1343                 /* GF_GPRINT */
1344
1345                 if (bad_format(im->gdes[i].format)) {
1346                         rrd_set_error("bad format for GPRINT in '%s'", im->gdes[i].format);
1347                         return -1;
1348                 }
1349 #ifdef HAVE_SNPRINTF
1350                 snprintf(im->gdes[i].legend,FMT_LEG_LEN-2,im->gdes[i].format,printval,si_symb);
1351 #else
1352                 sprintf(im->gdes[i].legend,im->gdes[i].format,printval,si_symb);
1353 #endif
1354                 graphelement = 1;
1355             }
1356             }
1357             break;
1358         case GF_LINE:
1359         case GF_AREA:
1360         case GF_TICK:
1361         case GF_STACK:
1362         case GF_HRULE:
1363         case GF_VRULE:
1364             graphelement = 1;
1365             break;
1366         case GF_COMMENT:
1367         case GF_DEF:
1368         case GF_CDEF:
1369         case GF_VDEF:
1370 #ifdef WITH_PIECHART
1371         case GF_PART:
1372 #endif
1373         case GF_SHIFT:
1374         case GF_XPORT:
1375             break;
1376         }
1377     }
1378     return graphelement;
1379 }
1380
1381
1382 /* place legends with color spots */
1383 int
1384 leg_place(image_desc_t *im)
1385 {
1386     /* graph labels */
1387     int   interleg = im->text_prop[TEXT_PROP_LEGEND].size*2.0;
1388     int   border = im->text_prop[TEXT_PROP_LEGEND].size*2.0;
1389     int   fill=0, fill_last;
1390     int   leg_c = 0;
1391     int   leg_x = border, leg_y = im->yimg;
1392     int   leg_cc;
1393     int   glue = 0;
1394     int   i,ii, mark = 0;
1395     char  prt_fctn; /*special printfunctions */
1396     int  *legspace;
1397
1398   if( !(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH) ) {
1399     if ((legspace = malloc(im->gdes_c*sizeof(int)))==NULL){
1400        rrd_set_error("malloc for legspace");
1401        return -1;
1402     }
1403
1404     for(i=0;i<im->gdes_c;i++){
1405         fill_last = fill;
1406
1407         /* hid legends for rules which are not displayed */
1408
1409         if(!(im->extra_flags & FORCE_RULES_LEGEND)) {
1410                 if (im->gdes[i].gf == GF_HRULE &&
1411                     (im->gdes[i].yrule < im->minval || im->gdes[i].yrule > im->maxval))
1412                     im->gdes[i].legend[0] = '\0';
1413
1414                 if (im->gdes[i].gf == GF_VRULE &&
1415                     (im->gdes[i].xrule < im->start || im->gdes[i].xrule > im->end))
1416                     im->gdes[i].legend[0] = '\0';
1417         }
1418
1419         leg_cc = strlen(im->gdes[i].legend);
1420
1421         /* is there a controle code ant the end of the legend string ? */
1422         /* and it is not a tab \\t */
1423         if (leg_cc >= 2 && im->gdes[i].legend[leg_cc-2] == '\\' && im->gdes[i].legend[leg_cc-1] != 't') {
1424             prt_fctn = im->gdes[i].legend[leg_cc-1];
1425             leg_cc -= 2;
1426             im->gdes[i].legend[leg_cc] = '\0';
1427         } else {
1428             prt_fctn = '\0';
1429         }
1430         /* remove exess space */
1431         while (prt_fctn=='g' &&
1432                leg_cc > 0 &&
1433                im->gdes[i].legend[leg_cc-1]==' '){
1434            leg_cc--;
1435            im->gdes[i].legend[leg_cc]='\0';
1436         }
1437         if (leg_cc != 0 ){
1438            legspace[i]=(prt_fctn=='g' ? 0 : interleg);
1439
1440            if (fill > 0){
1441                /* no interleg space if string ends in \g */
1442                fill += legspace[i];
1443             }
1444            fill += gfx_get_text_width(im->canvas, fill+border,
1445                                       im->text_prop[TEXT_PROP_LEGEND].font,
1446                                       im->text_prop[TEXT_PROP_LEGEND].size,
1447                                       im->tabwidth,
1448                                       im->gdes[i].legend, 0);
1449             leg_c++;
1450         } else {
1451            legspace[i]=0;
1452         }
1453         /* who said there was a special tag ... ?*/
1454         if (prt_fctn=='g') {
1455            prt_fctn = '\0';
1456         }
1457         if (prt_fctn == '\0') {
1458             if (i == im->gdes_c -1 ) prt_fctn ='l';
1459
1460             /* is it time to place the legends ? */
1461             if (fill > im->ximg - 2*border){
1462                 if (leg_c > 1) {
1463                     /* go back one */
1464                     i--;
1465                     fill = fill_last;
1466                     leg_c--;
1467                     prt_fctn = 'j';
1468                 } else {
1469                     prt_fctn = 'l';
1470                 }
1471
1472             }
1473         }
1474
1475
1476         if (prt_fctn != '\0'){
1477             leg_x = border;
1478             if (leg_c >= 2 && prt_fctn == 'j') {
1479                 glue = (im->ximg - fill - 2* border) / (leg_c-1);
1480             } else {
1481                 glue = 0;
1482             }
1483             if (prt_fctn =='c') leg_x =  (im->ximg - fill) / 2.0;
1484             if (prt_fctn =='r') leg_x =  im->ximg - fill - border;
1485
1486             for(ii=mark;ii<=i;ii++){
1487                 if(im->gdes[ii].legend[0]=='\0')
1488                     continue; /* skip empty legends */
1489                 im->gdes[ii].leg_x = leg_x;
1490                 im->gdes[ii].leg_y = leg_y;
1491                 leg_x +=
1492                  gfx_get_text_width(im->canvas, leg_x,
1493                                       im->text_prop[TEXT_PROP_LEGEND].font,
1494                                       im->text_prop[TEXT_PROP_LEGEND].size,
1495                                       im->tabwidth,
1496                                       im->gdes[ii].legend, 0)
1497                    + legspace[ii]
1498                    + glue;
1499             }
1500             leg_y += im->text_prop[TEXT_PROP_LEGEND].size*1.8;
1501             if (prt_fctn == 's') leg_y -=  im->text_prop[TEXT_PROP_LEGEND].size;
1502             fill = 0;
1503             leg_c = 0;
1504             mark = ii;
1505         }
1506     }
1507     im->yimg = leg_y;
1508     free(legspace);
1509   }
1510   return 0;
1511 }
1512
1513 /* create a grid on the graph. it determines what to do
1514    from the values of xsize, start and end */
1515
1516 /* the xaxis labels are determined from the number of seconds per pixel
1517    in the requested graph */
1518
1519
1520
1521 int
1522 calc_horizontal_grid(image_desc_t   *im)
1523 {
1524     double   range;
1525     double   scaledrange;
1526     int      pixel,i;
1527     int      gridind;
1528     int      decimals, fractionals;
1529
1530     im->ygrid_scale.labfact=2;
1531     gridind=-1;
1532     range =  im->maxval - im->minval;
1533     scaledrange = range / im->magfact;
1534
1535         /* does the scale of this graph make it impossible to put lines
1536            on it? If so, give up. */
1537         if (isnan(scaledrange)) {
1538                 return 0;
1539         }
1540
1541     /* find grid spaceing */
1542     pixel=1;
1543     if(isnan(im->ygridstep)){
1544         if(im->extra_flags & ALTYGRID) {
1545             /* find the value with max number of digits. Get number of digits */
1546             decimals = ceil(log10(max(fabs(im->maxval), fabs(im->minval))));
1547             if(decimals <= 0) /* everything is small. make place for zero */
1548                 decimals = 1;
1549
1550             fractionals = floor(log10(range));
1551             if(fractionals < 0) { /* small amplitude. */
1552                 int len = decimals - fractionals + 1;
1553                 if (im->unitslength < len) im->unitslength = len;
1554                 sprintf(im->ygrid_scale.labfmt, "%%%d.%df", len, -fractionals + 1);
1555             } else {
1556                 int len = decimals + 1;
1557                 if (im->unitslength < len) im->unitslength = len;
1558                 sprintf(im->ygrid_scale.labfmt, "%%%d.1f", len);
1559             }
1560             im->ygrid_scale.gridstep = pow((double)10, (double)fractionals);
1561             if(im->ygrid_scale.gridstep == 0) /* range is one -> 0.1 is reasonable scale */
1562                 im->ygrid_scale.gridstep = 0.1;
1563             /* should have at least 5 lines but no more then 15 */
1564             if(range/im->ygrid_scale.gridstep < 5)
1565                 im->ygrid_scale.gridstep /= 10;
1566             if(range/im->ygrid_scale.gridstep > 15)
1567                 im->ygrid_scale.gridstep *= 10;
1568             if(range/im->ygrid_scale.gridstep > 5) {
1569                 im->ygrid_scale.labfact = 1;
1570                 if(range/im->ygrid_scale.gridstep > 8)
1571                     im->ygrid_scale.labfact = 2;
1572             }
1573             else {
1574                 im->ygrid_scale.gridstep /= 5;
1575                 im->ygrid_scale.labfact = 5;
1576             }
1577         }
1578         else {
1579             for(i=0;ylab[i].grid > 0;i++){
1580                 pixel = im->ysize / (scaledrange / ylab[i].grid);
1581                 if (pixel > 5) {
1582                     gridind = i;
1583                     break;
1584                 }
1585             }
1586
1587             for(i=0; i<4;i++) {
1588                if (pixel * ylab[gridind].lfac[i] >=  2 * im->text_prop[TEXT_PROP_AXIS].size) {
1589                   im->ygrid_scale.labfact =  ylab[gridind].lfac[i];
1590                   break;
1591                }
1592             }
1593
1594             im->ygrid_scale.gridstep = ylab[gridind].grid * im->magfact;
1595         }
1596     } else {
1597         im->ygrid_scale.gridstep = im->ygridstep;
1598         im->ygrid_scale.labfact = im->ylabfact;
1599     }
1600     return 1;
1601 }
1602
1603 int draw_horizontal_grid(image_desc_t *im)
1604 {
1605     int      i;
1606     double   scaledstep;
1607     char     graph_label[100];
1608     double X0=im->xorigin;
1609     double X1=im->xorigin+im->xsize;
1610
1611     int sgrid = (int)( im->minval / im->ygrid_scale.gridstep - 1);
1612     int egrid = (int)( im->maxval / im->ygrid_scale.gridstep + 1);
1613     scaledstep = im->ygrid_scale.gridstep/im->magfact;
1614     for (i = sgrid; i <= egrid; i++){
1615        double Y0=ytr(im,im->ygrid_scale.gridstep*i);
1616        if ( Y0 >= im->yorigin-im->ysize
1617                  && Y0 <= im->yorigin){
1618             if(i % im->ygrid_scale.labfact == 0){
1619                 if (i==0 || im->symbol == ' ') {
1620                     if(scaledstep < 1){
1621                         if(im->extra_flags & ALTYGRID) {
1622                             sprintf(graph_label,im->ygrid_scale.labfmt,scaledstep*im->viewfactor*i);
1623                         }
1624                         else {
1625                             sprintf(graph_label,"%4.1f",scaledstep*im->viewfactor*i);
1626                         }
1627                     } else {
1628                         sprintf(graph_label,"%4.0f",scaledstep*im->viewfactor*i);
1629                     }
1630                 }else {
1631                     if(scaledstep < 1){
1632                         sprintf(graph_label,"%4.1f %c",scaledstep*im->viewfactor*i, im->symbol);
1633                     } else {
1634                         sprintf(graph_label,"%4.0f %c",scaledstep*im->viewfactor*i, im->symbol);
1635                     }
1636                 }
1637
1638                gfx_new_text ( im->canvas,
1639                               X0-im->text_prop[TEXT_PROP_AXIS].size, Y0,
1640                               im->graph_col[GRC_FONT],
1641                               im->text_prop[TEXT_PROP_AXIS].font,
1642                               im->text_prop[TEXT_PROP_AXIS].size,
1643                               im->tabwidth, 0.0, GFX_H_RIGHT, GFX_V_CENTER,
1644                               graph_label );
1645                gfx_new_dashed_line ( im->canvas,
1646                               X0-2,Y0,
1647                               X1+2,Y0,
1648                               MGRIDWIDTH, im->graph_col[GRC_MGRID],
1649                               im->grid_dash_on, im->grid_dash_off);
1650
1651             } else if (!(im->extra_flags & NOMINOR)) {
1652                gfx_new_dashed_line ( im->canvas,
1653                               X0-1,Y0,
1654                               X1+1,Y0,
1655                               GRIDWIDTH, im->graph_col[GRC_GRID],
1656                               im->grid_dash_on, im->grid_dash_off);
1657
1658             }
1659         }
1660     }
1661     return 1;
1662 }
1663
1664 /* logaritmic horizontal grid */
1665 int
1666 horizontal_log_grid(image_desc_t   *im)
1667 {
1668     double   pixpex;
1669     int      ii,i;
1670     int      minoridx=0, majoridx=0;
1671     char     graph_label[100];
1672     double   X0,X1,Y0;
1673     double   value, pixperstep, minstep;
1674
1675     /* find grid spaceing */
1676     pixpex= (double)im->ysize / (log10(im->maxval) - log10(im->minval));
1677
1678         if (isnan(pixpex)) {
1679                 return 0;
1680         }
1681
1682     for(i=0;yloglab[i][0] > 0;i++){
1683         minstep = log10(yloglab[i][0]);
1684         for(ii=1;yloglab[i][ii+1] > 0;ii++){
1685             if(yloglab[i][ii+2]==0){
1686                 minstep = log10(yloglab[i][ii+1])-log10(yloglab[i][ii]);
1687                 break;
1688             }
1689         }
1690         pixperstep = pixpex * minstep;
1691         if(pixperstep > 5){minoridx = i;}
1692        if(pixperstep > 2 *  im->text_prop[TEXT_PROP_LEGEND].size){majoridx = i;}
1693     }
1694
1695    X0=im->xorigin;
1696    X1=im->xorigin+im->xsize;
1697     /* paint minor grid */
1698     for (value = pow((double)10, log10(im->minval)
1699                           - fmod(log10(im->minval),log10(yloglab[minoridx][0])));
1700          value  <= im->maxval;
1701          value *= yloglab[minoridx][0]){
1702         if (value < im->minval) continue;
1703         i=0;
1704         while(yloglab[minoridx][++i] > 0){
1705            Y0 = ytr(im,value * yloglab[minoridx][i]);
1706            if (Y0 <= im->yorigin - im->ysize) break;
1707            gfx_new_dashed_line ( im->canvas,
1708                           X0-1,Y0,
1709                           X1+1,Y0,
1710                           GRIDWIDTH, im->graph_col[GRC_GRID],
1711                           im->grid_dash_on, im->grid_dash_off);
1712         }
1713     }
1714
1715     /* paint major grid and labels*/
1716     for (value = pow((double)10, log10(im->minval)
1717                           - fmod(log10(im->minval),log10(yloglab[majoridx][0])));
1718          value <= im->maxval;
1719          value *= yloglab[majoridx][0]){
1720         if (value < im->minval) continue;
1721         i=0;
1722         while(yloglab[majoridx][++i] > 0){
1723            Y0 = ytr(im,value * yloglab[majoridx][i]);
1724            if (Y0 <= im->yorigin - im->ysize) break;
1725            gfx_new_dashed_line ( im->canvas,
1726                           X0-2,Y0,
1727                           X1+2,Y0,
1728                           MGRIDWIDTH, im->graph_col[GRC_MGRID],
1729                           im->grid_dash_on, im->grid_dash_off);
1730
1731            sprintf(graph_label,"%3.0e",value * yloglab[majoridx][i]);
1732            gfx_new_text ( im->canvas,
1733                           X0-im->text_prop[TEXT_PROP_AXIS].size, Y0,
1734                           im->graph_col[GRC_FONT],
1735                           im->text_prop[TEXT_PROP_AXIS].font,
1736                           im->text_prop[TEXT_PROP_AXIS].size,
1737                           im->tabwidth,0.0, GFX_H_RIGHT, GFX_V_CENTER,
1738                           graph_label );
1739         }
1740     }
1741         return 1;
1742 }
1743
1744
1745 void
1746 vertical_grid(
1747     image_desc_t   *im )
1748 {
1749     int xlab_sel;               /* which sort of label and grid ? */
1750     time_t ti, tilab, timajor;
1751     long factor;
1752     char graph_label[100];
1753     double X0,Y0,Y1; /* points for filled graph and more*/
1754     struct tm tm;
1755
1756     /* the type of time grid is determined by finding
1757        the number of seconds per pixel in the graph */
1758
1759
1760     if(im->xlab_user.minsec == -1){
1761         factor=(im->end - im->start)/im->xsize;
1762         xlab_sel=0;
1763         while ( xlab[xlab_sel+1].minsec != -1
1764                 && xlab[xlab_sel+1].minsec <= factor){ xlab_sel++; }
1765         im->xlab_user.gridtm = xlab[xlab_sel].gridtm;
1766         im->xlab_user.gridst = xlab[xlab_sel].gridst;
1767         im->xlab_user.mgridtm = xlab[xlab_sel].mgridtm;
1768         im->xlab_user.mgridst = xlab[xlab_sel].mgridst;
1769         im->xlab_user.labtm = xlab[xlab_sel].labtm;
1770         im->xlab_user.labst = xlab[xlab_sel].labst;
1771         im->xlab_user.precis = xlab[xlab_sel].precis;
1772         im->xlab_user.stst = xlab[xlab_sel].stst;
1773     }
1774
1775     /* y coords are the same for every line ... */
1776     Y0 = im->yorigin;
1777     Y1 = im->yorigin-im->ysize;
1778
1779
1780     /* paint the minor grid */
1781     if (!(im->extra_flags & NOMINOR))
1782     {
1783         for(ti = find_first_time(im->start,
1784                                 im->xlab_user.gridtm,
1785                                 im->xlab_user.gridst),
1786             timajor = find_first_time(im->start,
1787                                 im->xlab_user.mgridtm,
1788                                 im->xlab_user.mgridst);
1789             ti < im->end;
1790             ti = find_next_time(ti,im->xlab_user.gridtm,im->xlab_user.gridst)
1791             ){
1792             /* are we inside the graph ? */
1793             if (ti < im->start || ti > im->end) continue;
1794             while (timajor < ti) {
1795                 timajor = find_next_time(timajor,
1796                         im->xlab_user.mgridtm, im->xlab_user.mgridst);
1797             }
1798             if (ti == timajor) continue; /* skip as falls on major grid line */
1799            X0 = xtr(im,ti);
1800            gfx_new_dashed_line(im->canvas,X0,Y0+1, X0,Y1-1,GRIDWIDTH,
1801                im->graph_col[GRC_GRID],
1802                im->grid_dash_on, im->grid_dash_off);
1803
1804         }
1805     }
1806
1807     /* paint the major grid */
1808     for(ti = find_first_time(im->start,
1809                             im->xlab_user.mgridtm,
1810                             im->xlab_user.mgridst);
1811         ti < im->end;
1812         ti = find_next_time(ti,im->xlab_user.mgridtm,im->xlab_user.mgridst)
1813         ){
1814         /* are we inside the graph ? */
1815         if (ti < im->start || ti > im->end) continue;
1816        X0 = xtr(im,ti);
1817        gfx_new_dashed_line(im->canvas,X0,Y0+3, X0,Y1-2,MGRIDWIDTH,
1818            im->graph_col[GRC_MGRID],
1819            im->grid_dash_on, im->grid_dash_off);
1820
1821     }
1822     /* paint the labels below the graph */
1823     for(ti = find_first_time(im->start - im->xlab_user.precis/2,
1824                             im->xlab_user.labtm,
1825                             im->xlab_user.labst);
1826         ti <= im->end - im->xlab_user.precis/2;
1827         ti = find_next_time(ti,im->xlab_user.labtm,im->xlab_user.labst)
1828         ){
1829         tilab= ti + im->xlab_user.precis/2; /* correct time for the label */
1830         /* are we inside the graph ? */
1831         if (tilab < im->start || tilab > im->end) continue;
1832
1833 #if HAVE_STRFTIME
1834         localtime_r(&tilab, &tm);
1835         strftime(graph_label,99,im->xlab_user.stst, &tm);
1836 #else
1837 # error "your libc has no strftime I guess we'll abort the exercise here."
1838 #endif
1839        gfx_new_text ( im->canvas,
1840                       xtr(im,tilab), Y0+im->text_prop[TEXT_PROP_AXIS].size,
1841                       im->graph_col[GRC_FONT],
1842                       im->text_prop[TEXT_PROP_AXIS].font,
1843                       im->text_prop[TEXT_PROP_AXIS].size,
1844                       im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_TOP,
1845                       graph_label );
1846
1847     }
1848
1849 }
1850
1851
1852 void
1853 axis_paint(
1854    image_desc_t   *im
1855            )
1856 {
1857     /* draw x and y axis */
1858     /* gfx_new_line ( im->canvas, im->xorigin+im->xsize,im->yorigin,
1859                       im->xorigin+im->xsize,im->yorigin-im->ysize,
1860                       GRIDWIDTH, im->graph_col[GRC_AXIS]);
1861
1862        gfx_new_line ( im->canvas, im->xorigin,im->yorigin-im->ysize,
1863                          im->xorigin+im->xsize,im->yorigin-im->ysize,
1864                          GRIDWIDTH, im->graph_col[GRC_AXIS]); */
1865
1866        gfx_new_line ( im->canvas, im->xorigin-4,im->yorigin,
1867                          im->xorigin+im->xsize+4,im->yorigin,
1868                          MGRIDWIDTH, im->graph_col[GRC_AXIS]);
1869
1870        gfx_new_line ( im->canvas, im->xorigin,im->yorigin+4,
1871                          im->xorigin,im->yorigin-im->ysize-4,
1872                          MGRIDWIDTH, im->graph_col[GRC_AXIS]);
1873
1874
1875     /* arrow for X and Y axis direction */
1876     gfx_new_area ( im->canvas,
1877                    im->xorigin+im->xsize+2,  im->yorigin-2,
1878                    im->xorigin+im->xsize+2,  im->yorigin+3,
1879                    im->xorigin+im->xsize+7,  im->yorigin+0.5, /* LINEOFFSET */
1880                    im->graph_col[GRC_ARROW]);
1881
1882     gfx_new_area ( im->canvas,
1883                    im->xorigin-2,  im->yorigin-im->ysize-2,
1884                    im->xorigin+3,  im->yorigin-im->ysize-2,
1885                    im->xorigin+0.5,    im->yorigin-im->ysize-7, /* LINEOFFSET */
1886                    im->graph_col[GRC_ARROW]);
1887
1888 }
1889
1890 void
1891 grid_paint(image_desc_t   *im)
1892 {
1893     long i;
1894     int res=0;
1895     double X0,Y0; /* points for filled graph and more*/
1896     gfx_node_t *node;
1897
1898     /* draw 3d border */
1899     node = gfx_new_area (im->canvas, 0,im->yimg,
1900                                  2,im->yimg-2,
1901                                  2,2,im->graph_col[GRC_SHADEA]);
1902     gfx_add_point( node , im->ximg - 2, 2 );
1903     gfx_add_point( node , im->ximg, 0 );
1904     gfx_add_point( node , 0,0 );
1905 /*    gfx_add_point( node , 0,im->yimg ); */
1906
1907     node =  gfx_new_area (im->canvas, 2,im->yimg-2,
1908                                   im->ximg-2,im->yimg-2,
1909                                   im->ximg - 2, 2,
1910                                  im->graph_col[GRC_SHADEB]);
1911     gfx_add_point( node ,   im->ximg,0);
1912     gfx_add_point( node ,   im->ximg,im->yimg);
1913     gfx_add_point( node ,   0,im->yimg);
1914 /*    gfx_add_point( node , 0,im->yimg ); */
1915
1916
1917     if (im->draw_x_grid == 1 )
1918       vertical_grid(im);
1919
1920     if (im->draw_y_grid == 1){
1921         if(im->logarithmic){
1922                 res = horizontal_log_grid(im);
1923         } else {
1924                 res = draw_horizontal_grid(im);
1925         }
1926
1927         /* dont draw horizontal grid if there is no min and max val */
1928         if (! res ) {
1929           char *nodata = "No Data found";
1930            gfx_new_text(im->canvas,im->ximg/2, (2*im->yorigin-im->ysize) / 2,
1931                         im->graph_col[GRC_FONT],
1932                         im->text_prop[TEXT_PROP_AXIS].font,
1933                         im->text_prop[TEXT_PROP_AXIS].size,
1934                         im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_CENTER,
1935                         nodata );
1936         }
1937     }
1938
1939     /* yaxis unit description */
1940     gfx_new_text( im->canvas,
1941                   7, (im->yorigin - im->ysize/2),
1942                   im->graph_col[GRC_FONT],
1943                   im->text_prop[TEXT_PROP_UNIT].font,
1944                   im->text_prop[TEXT_PROP_UNIT].size, im->tabwidth,
1945                   RRDGRAPH_YLEGEND_ANGLE,
1946                   GFX_H_LEFT, GFX_V_CENTER,
1947                   im->ylegend);
1948
1949     /* graph title */
1950     gfx_new_text( im->canvas,
1951                   im->ximg/2, im->text_prop[TEXT_PROP_TITLE].size*1.2,
1952                   im->graph_col[GRC_FONT],
1953                   im->text_prop[TEXT_PROP_TITLE].font,
1954                   im->text_prop[TEXT_PROP_TITLE].size, im->tabwidth, 0.0,
1955                   GFX_H_CENTER, GFX_V_CENTER,
1956                   im->title);
1957
1958     /* graph labels */
1959     if( !(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH) ) {
1960             for(i=0;i<im->gdes_c;i++){
1961                     if(im->gdes[i].legend[0] =='\0')
1962                             continue;
1963
1964                     /* im->gdes[i].leg_y is the bottom of the legend */
1965                     X0 = im->gdes[i].leg_x;
1966                     Y0 = im->gdes[i].leg_y;
1967                     gfx_new_text ( im->canvas, X0, Y0,
1968                                    im->graph_col[GRC_FONT],
1969                                    im->text_prop[TEXT_PROP_LEGEND].font,
1970                                    im->text_prop[TEXT_PROP_LEGEND].size,
1971                                    im->tabwidth,0.0, GFX_H_LEFT, GFX_V_BOTTOM,
1972                                    im->gdes[i].legend );
1973                     /* The legend for GRAPH items starts with "M " to have
1974                        enough space for the box */
1975                     if (           im->gdes[i].gf != GF_PRINT &&
1976                                    im->gdes[i].gf != GF_GPRINT &&
1977                                    im->gdes[i].gf != GF_COMMENT) {
1978                             int boxH, boxV;
1979
1980                             boxH = gfx_get_text_width(im->canvas, 0,
1981                                                       im->text_prop[TEXT_PROP_LEGEND].font,
1982                                                       im->text_prop[TEXT_PROP_LEGEND].size,
1983                                                       im->tabwidth,"M", 0)*1.2;
1984                             boxV = boxH;
1985
1986                             /* make sure transparent colors show up all the same */
1987                             node = gfx_new_area(im->canvas,
1988                                                 X0,Y0-boxV,
1989                                                 X0,Y0,
1990                                                 X0+boxH,Y0,
1991                                                 im->graph_col[GRC_CANVAS]);
1992                             gfx_add_point ( node, X0+boxH, Y0-boxV );
1993
1994                             node = gfx_new_area(im->canvas,
1995                                                 X0,Y0-boxV,
1996                                                 X0,Y0,
1997                                                 X0+boxH,Y0,
1998                                                 im->gdes[i].col);
1999                             gfx_add_point ( node, X0+boxH, Y0-boxV );
2000                             node = gfx_new_line(im->canvas,
2001                                                 X0,Y0-boxV, X0,Y0,
2002                                                 1,im->graph_col[GRC_FONT]);
2003                             gfx_add_point(node,X0+boxH,Y0);
2004                             gfx_add_point(node,X0+boxH,Y0-boxV);
2005                             gfx_close_path(node);
2006                     }
2007             }
2008     }
2009 }
2010
2011
2012 /*****************************************************
2013  * lazy check make sure we rely need to create this graph
2014  *****************************************************/
2015
2016 int lazy_check(image_desc_t *im){
2017     FILE *fd = NULL;
2018         int size = 1;
2019     struct stat  imgstat;
2020
2021     if (im->lazy == 0) return 0; /* no lazy option */
2022     if (stat(im->graphfile,&imgstat) != 0)
2023       return 0; /* can't stat */
2024     /* one pixel in the existing graph is more then what we would
2025        change here ... */
2026     if (time(NULL) - imgstat.st_mtime >
2027         (im->end - im->start) / im->xsize)
2028       return 0;
2029     if ((fd = fopen(im->graphfile,"rb")) == NULL)
2030       return 0; /* the file does not exist */
2031     switch (im->canvas->imgformat) {
2032     case IF_PNG:
2033            size = PngSize(fd,&(im->ximg),&(im->yimg));
2034            break;
2035     default:
2036            size = 1;
2037     }
2038     fclose(fd);
2039     return size;
2040 }
2041
2042 #ifdef WITH_PIECHART
2043 void
2044 pie_part(image_desc_t *im, gfx_color_t color,
2045             double PieCenterX, double PieCenterY, double Radius,
2046             double startangle, double endangle)
2047 {
2048     gfx_node_t *node;
2049     double angle;
2050     double step=M_PI/50; /* Number of iterations for the circle;
2051                          ** 10 is definitely too low, more than
2052                          ** 50 seems to be overkill
2053                          */
2054
2055     /* Strange but true: we have to work clockwise or else
2056     ** anti aliasing nor transparency don't work.
2057     **
2058     ** This test is here to make sure we do it right, also
2059     ** this makes the for...next loop more easy to implement.
2060     ** The return will occur if the user enters a negative number
2061     ** (which shouldn't be done according to the specs) or if the
2062     ** programmers do something wrong (which, as we all know, never
2063     ** happens anyway :)
2064     */
2065     if (endangle<startangle) return;
2066
2067     /* Hidden feature: Radius decreases each full circle */
2068     angle=startangle;
2069     while (angle>=2*M_PI) {
2070         angle  -= 2*M_PI;
2071         Radius *= 0.8;
2072     }
2073
2074     node=gfx_new_area(im->canvas,
2075                 PieCenterX+sin(startangle)*Radius,
2076                 PieCenterY-cos(startangle)*Radius,
2077                 PieCenterX,
2078                 PieCenterY,
2079                 PieCenterX+sin(endangle)*Radius,
2080                 PieCenterY-cos(endangle)*Radius,
2081                 color);
2082     for (angle=endangle;angle-startangle>=step;angle-=step) {
2083         gfx_add_point(node,
2084                 PieCenterX+sin(angle)*Radius,
2085                 PieCenterY-cos(angle)*Radius );
2086     }
2087 }
2088
2089 #endif
2090
2091 int
2092 graph_size_location(image_desc_t *im, int elements
2093
2094 #ifdef WITH_PIECHART
2095 , int piechart
2096 #endif
2097
2098  )
2099 {
2100     /* The actual size of the image to draw is determined from
2101     ** several sources.  The size given on the command line is
2102     ** the graph area but we need more as we have to draw labels
2103     ** and other things outside the graph area
2104     */
2105
2106     /* +-+-------------------------------------------+
2107     ** |l|.................title.....................|
2108     ** |e+--+-------------------------------+--------+
2109     ** |b| b|                               |        |
2110     ** |a| a|                               |  pie   |
2111     ** |l| l|          main graph area      | chart  |
2112     ** |.| .|                               |  area  |
2113     ** |t| y|                               |        |
2114     ** |r+--+-------------------------------+--------+
2115     ** |e|  | x-axis labels                 |        |
2116     ** |v+--+-------------------------------+--------+
2117     ** | |..............legends......................|
2118     ** +-+-------------------------------------------+
2119     */
2120     int Xvertical=0,    Yvertical=0,
2121                         Ytitle   =0,
2122         Xylabel  =0,
2123         Xmain    =0,    Ymain    =0,
2124 #ifdef WITH_PIECHART
2125         Xpie     =0,    Ypie     =0,
2126 #endif
2127                         Yxlabel  =0,
2128 #if 0
2129         Xlegend  =0,    Ylegend  =0,
2130 #endif
2131         Xspacing =15,  Yspacing =15;
2132
2133     if (im->extra_flags & ONLY_GRAPH) {
2134         im->xorigin =0;
2135         im->ximg = im->xsize;
2136         im->yimg = im->ysize;
2137         im->yorigin = im->ysize;
2138         return 0;
2139     }
2140
2141     if (im->ylegend[0] != '\0' ) {
2142            Xvertical = im->text_prop[TEXT_PROP_UNIT].size *2;
2143            Yvertical = gfx_get_text_width(im->canvas, 0,
2144                                           im->text_prop[TEXT_PROP_UNIT].font,
2145                                           im->text_prop[TEXT_PROP_UNIT].size,
2146                                           im->tabwidth,im->ylegend, 0);
2147     }
2148
2149
2150     if (im->title[0] != '\0') {
2151         /* The title is placed "inbetween" two text lines so it
2152         ** automatically has some vertical spacing.  The horizontal
2153         ** spacing is added here, on each side.
2154         */
2155         /* don't care for the with of the title
2156                 Xtitle = gfx_get_text_width(im->canvas, 0,
2157                 im->text_prop[TEXT_PROP_TITLE].font,
2158                 im->text_prop[TEXT_PROP_TITLE].size,
2159                 im->tabwidth,
2160                 im->title, 0) + 2*Xspacing; */
2161         Ytitle = im->text_prop[TEXT_PROP_TITLE].size*2.5;
2162     }
2163
2164     if (elements) {
2165         Xmain=im->xsize;
2166         Ymain=im->ysize;
2167         if (im->draw_x_grid) {
2168             Yxlabel=im->text_prop[TEXT_PROP_AXIS].size *2.5;
2169         }
2170         if (im->draw_y_grid) {
2171             Xylabel=gfx_get_text_width(im->canvas, 0,
2172                         im->text_prop[TEXT_PROP_AXIS].font,
2173                         im->text_prop[TEXT_PROP_AXIS].size,
2174                         im->tabwidth,
2175                         "0", 0) * im->unitslength + im->text_prop[TEXT_PROP_AXIS].size * 2;
2176         }
2177     }
2178
2179 #ifdef WITH_PIECHART
2180     if (piechart) {
2181         im->piesize=im->xsize<im->ysize?im->xsize:im->ysize;
2182         Xpie=im->piesize;
2183         Ypie=im->piesize;
2184     }
2185 #endif
2186
2187     /* Now calculate the total size.  Insert some spacing where
2188        desired.  im->xorigin and im->yorigin need to correspond
2189        with the lower left corner of the main graph area or, if
2190        this one is not set, the imaginary box surrounding the
2191        pie chart area. */
2192
2193     /* The legend width cannot yet be determined, as a result we
2194     ** have problems adjusting the image to it.  For now, we just
2195     ** forget about it at all; the legend will have to fit in the
2196     ** size already allocated.
2197     */
2198     im->ximg = Xylabel + Xmain + 2 * Xspacing;
2199
2200 #ifdef WITH_PIECHART
2201     im->ximg  += Xpie;
2202 #endif
2203
2204     if (Xmain) im->ximg += Xspacing;
2205 #ifdef WITH_PIECHART
2206     if (Xpie) im->ximg += Xspacing;
2207 #endif
2208
2209     im->xorigin = Xspacing + Xylabel;
2210
2211     /* the length of the title should not influence with width of the graph
2212        if (Xtitle > im->ximg) im->ximg = Xtitle; */
2213
2214     if (Xvertical) { /* unit description */
2215         im->ximg += Xvertical;
2216         im->xorigin += Xvertical;
2217     }
2218     xtr(im,0);
2219
2220     /* The vertical size is interesting... we need to compare
2221     ** the sum of {Ytitle, Ymain, Yxlabel, Ylegend} with Yvertical
2222     ** however we need to know {Ytitle+Ymain+Yxlabel} in order to
2223     ** start even thinking about Ylegend.
2224     **
2225     ** Do it in three portions: First calculate the inner part,
2226     ** then do the legend, then adjust the total height of the img.
2227     */
2228
2229     /* reserve space for main and/or pie */
2230
2231     im->yimg = Ymain + Yxlabel;
2232
2233 #ifdef WITH_PIECHART
2234     if (im->yimg < Ypie) im->yimg = Ypie;
2235 #endif
2236
2237     im->yorigin = im->yimg - Yxlabel;
2238
2239     /* reserve space for the title *or* some padding above the graph */
2240     if (Ytitle) {
2241         im->yimg += Ytitle;
2242         im->yorigin += Ytitle;
2243     } else {
2244         im->yimg += Yspacing;
2245         im->yorigin += Yspacing;
2246     }
2247     /* reserve space for padding below the graph */
2248     im->yimg += Yspacing;
2249     ytr(im,DNAN);
2250
2251     /* Determine where to place the legends onto the image.
2252     ** Adjust im->yimg to match the space requirements.
2253     */
2254     if(leg_place(im)==-1)
2255         return -1;
2256
2257     /* last of three steps: check total height of image */
2258     if (im->yimg < Yvertical) im->yimg = Yvertical;
2259
2260 #if 0
2261     if (Xlegend > im->ximg) {
2262         im->ximg = Xlegend;
2263         /* reposition Pie */
2264     }
2265 #endif
2266
2267 #ifdef WITH_PIECHART
2268     /* The pie is placed in the upper right hand corner,
2269     ** just below the title (if any) and with sufficient
2270     ** padding.
2271     */
2272     if (elements) {
2273         im->pie_x = im->ximg - Xspacing - Xpie/2;
2274         im->pie_y = im->yorigin-Ymain+Ypie/2;
2275     } else {
2276         im->pie_x = im->ximg/2;
2277         im->pie_y = im->yorigin-Ypie/2;
2278     }
2279 #endif
2280
2281     return 0;
2282 }
2283
2284 /* draw that picture thing ... */
2285 int
2286 graph_paint(image_desc_t *im, char ***calcpr)
2287 {
2288   int i,ii;
2289   int lazy =     lazy_check(im);
2290 #ifdef WITH_PIECHART
2291   int piechart = 0;
2292   double PieStart=0.0;
2293 #endif
2294   FILE  *fo;
2295   gfx_node_t *node;
2296
2297   double areazero = 0.0;
2298   enum gf_en stack_gf = GF_PRINT;
2299   graph_desc_t *lastgdes = NULL;
2300
2301   /* if we are lazy and there is nothing to PRINT ... quit now */
2302   if (lazy && im->prt_c==0) return 0;
2303
2304   /* pull the data from the rrd files ... */
2305
2306   if(data_fetch(im)==-1)
2307     return -1;
2308
2309   /* evaluate VDEF and CDEF operations ... */
2310   if(data_calc(im)==-1)
2311     return -1;
2312
2313 #ifdef WITH_PIECHART
2314   /* check if we need to draw a piechart */
2315   for(i=0;i<im->gdes_c;i++){
2316     if (im->gdes[i].gf == GF_PART) {
2317       piechart=1;
2318       break;
2319     }
2320   }
2321 #endif
2322
2323   /* calculate and PRINT and GPRINT definitions. We have to do it at
2324    * this point because it will affect the length of the legends
2325    * if there are no graph elements we stop here ...
2326    * if we are lazy, try to quit ...
2327    */
2328   i=print_calc(im,calcpr);
2329   if(i<0) return -1;
2330   if(((i==0)
2331 #ifdef WITH_PIECHART
2332 &&(piechart==0)
2333 #endif
2334 ) || lazy) return 0;
2335
2336 #ifdef WITH_PIECHART
2337   /* If there's only the pie chart to draw, signal this */
2338   if (i==0) piechart=2;
2339 #endif
2340
2341   /* get actual drawing data and find min and max values*/
2342   if(data_proc(im)==-1)
2343     return -1;
2344
2345   if(!im->logarithmic){si_unit(im);}        /* identify si magnitude Kilo, Mega Giga ? */
2346
2347   if(!im->rigid && ! im->logarithmic)
2348     expand_range(im);   /* make sure the upper and lower limit are
2349                            sensible values */
2350
2351   if (!calc_horizontal_grid(im))
2352     return -1;
2353
2354   if (im->gridfit)
2355     apply_gridfit(im);
2356
2357
2358 /**************************************************************
2359  *** Calculating sizes and locations became a bit confusing ***
2360  *** so I moved this into a separate function.              ***
2361  **************************************************************/
2362   if(graph_size_location(im,i
2363 #ifdef WITH_PIECHART
2364 ,piechart
2365 #endif
2366 )==-1)
2367     return -1;
2368
2369   /* the actual graph is created by going through the individual
2370      graph elements and then drawing them */
2371
2372   node=gfx_new_area ( im->canvas,
2373                       0, 0,
2374                       im->ximg, 0,
2375                       im->ximg, im->yimg,
2376                       im->graph_col[GRC_BACK]);
2377
2378   gfx_add_point(node,0, im->yimg);
2379
2380 #ifdef WITH_PIECHART
2381   if (piechart != 2) {
2382 #endif
2383     node=gfx_new_area ( im->canvas,
2384                       im->xorigin,             im->yorigin,
2385                       im->xorigin + im->xsize, im->yorigin,
2386                       im->xorigin + im->xsize, im->yorigin-im->ysize,
2387                       im->graph_col[GRC_CANVAS]);
2388
2389     gfx_add_point(node,im->xorigin, im->yorigin - im->ysize);
2390
2391     if (im->minval > 0.0)
2392       areazero = im->minval;
2393     if (im->maxval < 0.0)
2394       areazero = im->maxval;
2395 #ifdef WITH_PIECHART
2396    }
2397 #endif
2398
2399 #ifdef WITH_PIECHART
2400   if (piechart) {
2401     pie_part(im,im->graph_col[GRC_CANVAS],im->pie_x,im->pie_y,im->piesize*0.5,0,2*M_PI);
2402   }
2403 #endif
2404
2405   for(i=0;i<im->gdes_c;i++){
2406     switch(im->gdes[i].gf){
2407     case GF_CDEF:
2408     case GF_VDEF:
2409     case GF_DEF:
2410     case GF_PRINT:
2411     case GF_GPRINT:
2412     case GF_COMMENT:
2413     case GF_HRULE:
2414     case GF_VRULE:
2415     case GF_XPORT:
2416     case GF_SHIFT:
2417       break;
2418     case GF_TICK:
2419       for (ii = 0; ii < im->xsize; ii++)
2420         {
2421           if (!isnan(im->gdes[i].p_data[ii]) &&
2422               im->gdes[i].p_data[ii] > 0.0)
2423             {
2424               /* generate a tick */
2425               gfx_new_line(im->canvas, im -> xorigin + ii,
2426                            im -> yorigin - (im -> gdes[i].yrule * im -> ysize),
2427                            im -> xorigin + ii,
2428                            im -> yorigin,
2429                            1.0,
2430                            im -> gdes[i].col );
2431             }
2432         }
2433       break;
2434     case GF_LINE:
2435     case GF_AREA:
2436       stack_gf = im->gdes[i].gf;
2437     case GF_STACK:
2438       /* fix data points at oo and -oo */
2439       for(ii=0;ii<im->xsize;ii++){
2440         if (isinf(im->gdes[i].p_data[ii])){
2441           if (im->gdes[i].p_data[ii] > 0) {
2442             im->gdes[i].p_data[ii] = im->maxval ;
2443           } else {
2444             im->gdes[i].p_data[ii] = im->minval ;
2445           }
2446
2447         }
2448       } /* for */
2449
2450       /* *******************************************************
2451                    ___
2452                   |   |    ___
2453               ____|   |   |   |
2454               |       |___|
2455        -------|---------------------------------------
2456
2457       if we know the value of y at time t was a then
2458       we draw a square from t-1 to t with the value a.
2459
2460       ********************************************************* */
2461       if (im->gdes[i].col != 0x0){
2462         /* GF_LINE and friend */
2463         if(stack_gf == GF_LINE ){
2464           node = NULL;
2465           for(ii=1;ii<im->xsize;ii++){
2466             if (isnan(im->gdes[i].p_data[ii])){
2467                 node = NULL;
2468                 continue;
2469             }
2470             if ( node == NULL ) {
2471                  node = gfx_new_line(im->canvas,
2472                                     ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2473                                     ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2474                                     im->gdes[i].linewidth,
2475                                     im->gdes[i].col);
2476              } else {
2477                gfx_add_point(node,ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2478                gfx_add_point(node,ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2479              };
2480
2481           }
2482         } else {
2483           for(ii=1;ii<im->xsize;ii++){
2484             /* keep things simple for now, just draw these bars
2485                do not try to build a big and complex area */
2486             float ybase,ytop;
2487             if ( isnan(im->gdes[i].p_data[ii]) ) {
2488                 continue;
2489             }
2490             ytop = ytr(im,im->gdes[i].p_data[ii]);
2491             if ( im->gdes[i].stack ) {
2492                   ybase = ytr(im,lastgdes->p_data[ii]);
2493             } else {
2494                   ybase = ytr(im,areazero);
2495             }
2496             if ( ybase == ytop ){
2497                 continue;
2498             }
2499             node = gfx_new_area(im->canvas,
2500                                 ii-1+im->xorigin,ybase,
2501                                 ii-1+im->xorigin,ytop,
2502                                 ii+im->xorigin,ytop,
2503                                 im->gdes[i].col
2504                                );
2505             gfx_add_point(node,ii+im->xorigin,ybase);
2506           }
2507         } /* else GF_LINE */
2508       } /* if color != 0x0 */
2509       /* make sure we do not run into trouble when stacking on NaN */
2510       for(ii=0;ii<im->xsize;ii++){
2511         if (isnan(im->gdes[i].p_data[ii])) {
2512           if (lastgdes && (im->gdes[i].stack)) {
2513             im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
2514           } else {
2515             im->gdes[i].p_data[ii] =  ytr(im,areazero);
2516           }
2517         }
2518       }
2519       lastgdes = &(im->gdes[i]);
2520       break;
2521 #ifdef WITH_PIECHART
2522     case GF_PART:
2523       if(isnan(im->gdes[i].yrule)) /* fetch variable */
2524         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2525
2526       if (finite(im->gdes[i].yrule)) {  /* even the fetched var can be NaN */
2527         pie_part(im,im->gdes[i].col,
2528                 im->pie_x,im->pie_y,im->piesize*0.4,
2529                 M_PI*2.0*PieStart/100.0,
2530                 M_PI*2.0*(PieStart+im->gdes[i].yrule)/100.0);
2531         PieStart += im->gdes[i].yrule;
2532       }
2533       break;
2534 #endif
2535
2536     } /* switch */
2537   }
2538 #ifdef WITH_PIECHART
2539   if (piechart==2) {
2540     im->draw_x_grid=0;
2541     im->draw_y_grid=0;
2542   }
2543 #endif
2544
2545
2546   /* grid_paint also does the text */
2547   if( !(im->extra_flags & ONLY_GRAPH) )
2548     grid_paint(im);
2549
2550
2551   if( !(im->extra_flags & ONLY_GRAPH) )
2552       axis_paint(im);
2553
2554   /* the RULES are the last thing to paint ... */
2555   for(i=0;i<im->gdes_c;i++){
2556
2557     switch(im->gdes[i].gf){
2558     case GF_HRULE:
2559       if(isnan(im->gdes[i].yrule)) { /* fetch variable */
2560         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2561       };
2562       if(im->gdes[i].yrule >= im->minval
2563          && im->gdes[i].yrule <= im->maxval)
2564         gfx_new_line(im->canvas,
2565                      im->xorigin,ytr(im,im->gdes[i].yrule),
2566                      im->xorigin+im->xsize,ytr(im,im->gdes[i].yrule),
2567                      1.0,im->gdes[i].col);
2568       break;
2569     case GF_VRULE:
2570       if(im->gdes[i].xrule == 0) { /* fetch variable */
2571         im->gdes[i].xrule = im->gdes[im->gdes[i].vidx].vf.when;
2572       };
2573       if(im->gdes[i].xrule >= im->start
2574          && im->gdes[i].xrule <= im->end)
2575         gfx_new_line(im->canvas,
2576                      xtr(im,im->gdes[i].xrule),im->yorigin,
2577                      xtr(im,im->gdes[i].xrule),im->yorigin-im->ysize,
2578                      1.0,im->gdes[i].col);
2579       break;
2580     default:
2581       break;
2582     }
2583   }
2584
2585
2586   if (strcmp(im->graphfile,"-")==0) {
2587     fo = im->graphhandle ? im->graphhandle : stdout;
2588 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2589     /* Change translation mode for stdout to BINARY */
2590     _setmode( _fileno( fo ), O_BINARY );
2591 #endif
2592   } else {
2593     if ((fo = fopen(im->graphfile,"wb")) == NULL) {
2594       rrd_set_error("Opening '%s' for write: %s",im->graphfile,
2595                     rrd_strerror(errno));
2596       return (-1);
2597     }
2598   }
2599   gfx_render (im->canvas,im->ximg,im->yimg,0x0,fo);
2600   if (strcmp(im->graphfile,"-") != 0)
2601     fclose(fo);
2602   return 0;
2603 }
2604
2605
2606 /*****************************************************
2607  * graph stuff
2608  *****************************************************/
2609
2610 int
2611 gdes_alloc(image_desc_t *im){
2612
2613     im->gdes_c++;
2614     if ((im->gdes = (graph_desc_t *) rrd_realloc(im->gdes, (im->gdes_c)
2615                                            * sizeof(graph_desc_t)))==NULL){
2616         rrd_set_error("realloc graph_descs");
2617         return -1;
2618     }
2619
2620
2621     im->gdes[im->gdes_c-1].step=im->step;
2622     im->gdes[im->gdes_c-1].stack=0;
2623     im->gdes[im->gdes_c-1].debug=0;
2624     im->gdes[im->gdes_c-1].start=im->start;
2625     im->gdes[im->gdes_c-1].end=im->end;
2626     im->gdes[im->gdes_c-1].vname[0]='\0';
2627     im->gdes[im->gdes_c-1].data=NULL;
2628     im->gdes[im->gdes_c-1].ds_namv=NULL;
2629     im->gdes[im->gdes_c-1].data_first=0;
2630     im->gdes[im->gdes_c-1].p_data=NULL;
2631     im->gdes[im->gdes_c-1].rpnp=NULL;
2632     im->gdes[im->gdes_c-1].shift=0;
2633     im->gdes[im->gdes_c-1].col = 0x0;
2634     im->gdes[im->gdes_c-1].legend[0]='\0';
2635     im->gdes[im->gdes_c-1].format[0]='\0';
2636     im->gdes[im->gdes_c-1].rrd[0]='\0';
2637     im->gdes[im->gdes_c-1].ds=-1;
2638     im->gdes[im->gdes_c-1].p_data=NULL;
2639     im->gdes[im->gdes_c-1].yrule=DNAN;
2640     im->gdes[im->gdes_c-1].xrule=0;
2641     return 0;
2642 }
2643
2644 /* copies input untill the first unescaped colon is found
2645    or until input ends. backslashes have to be escaped as well */
2646 int
2647 scan_for_col(char *input, int len, char *output)
2648 {
2649     int inp,outp=0;
2650     for (inp=0;
2651          inp < len &&
2652            input[inp] != ':' &&
2653            input[inp] != '\0';
2654          inp++){
2655       if (input[inp] == '\\' &&
2656           input[inp+1] != '\0' &&
2657           (input[inp+1] == '\\' ||
2658            input[inp+1] == ':')){
2659         output[outp++] = input[++inp];
2660       }
2661       else {
2662         output[outp++] = input[inp];
2663       }
2664     }
2665     output[outp] = '\0';
2666     return inp;
2667 }
2668 /* Some surgery done on this function, it became ridiculously big.
2669 ** Things moved:
2670 ** - initializing     now in rrd_graph_init()
2671 ** - options parsing  now in rrd_graph_options()
2672 ** - script parsing   now in rrd_graph_script()
2673 */
2674 int
2675 rrd_graph(int argc, char **argv, char ***prdata, int *xsize, int *ysize, FILE *stream, double *ymin, double *ymax)
2676 {
2677     image_desc_t   im;
2678     rrd_graph_init(&im);
2679     im.graphhandle = stream;
2680
2681     rrd_graph_options(argc,argv,&im);
2682     if (rrd_test_error()) {
2683         im_free(&im);
2684         return -1;
2685     }
2686
2687     if (strlen(argv[optind])>=MAXPATH) {
2688         rrd_set_error("filename (including path) too long");
2689         im_free(&im);
2690         return -1;
2691     }
2692     strncpy(im.graphfile,argv[optind],MAXPATH-1);
2693     im.graphfile[MAXPATH-1]='\0';
2694
2695     rrd_graph_script(argc,argv,&im,1);
2696     if (rrd_test_error()) {
2697         im_free(&im);
2698         return -1;
2699     }
2700
2701     /* Everything is now read and the actual work can start */
2702
2703     (*prdata)=NULL;
2704     if (graph_paint(&im,prdata)==-1){
2705         im_free(&im);
2706         return -1;
2707     }
2708
2709     /* The image is generated and needs to be output.
2710     ** Also, if needed, print a line with information about the image.
2711     */
2712
2713     *xsize=im.ximg;
2714     *ysize=im.yimg;
2715     *ymin=im.minval;
2716     *ymax=im.maxval;
2717     if (im.imginfo) {
2718         char *filename;
2719         if (!(*prdata)) {
2720             /* maybe prdata is not allocated yet ... lets do it now */
2721             if ((*prdata = calloc(2,sizeof(char *)))==NULL) {
2722                 rrd_set_error("malloc imginfo");
2723                 return -1;
2724             };
2725         }
2726         if(((*prdata)[0] = malloc((strlen(im.imginfo)+200+strlen(im.graphfile))*sizeof(char)))
2727          ==NULL){
2728             rrd_set_error("malloc imginfo");
2729             return -1;
2730         }
2731         filename=im.graphfile+strlen(im.graphfile);
2732         while(filename > im.graphfile) {
2733             if (*(filename-1)=='/' || *(filename-1)=='\\' ) break;
2734             filename--;
2735         }
2736
2737         sprintf((*prdata)[0],im.imginfo,filename,(long)(im.canvas->zoom*im.ximg),(long)(im.canvas->zoom*im.yimg));
2738     }
2739     im_free(&im);
2740     return 0;
2741 }
2742
2743 void
2744 rrd_graph_init(image_desc_t *im)
2745 {
2746     unsigned int i;
2747
2748 #ifdef HAVE_TZSET
2749     tzset();
2750 #endif
2751 #ifdef HAVE_SETLOCALE
2752     setlocale(LC_TIME,"");
2753 #endif
2754     im->yorigin=0;
2755     im->xorigin=0;
2756     im->minval=0;
2757     im->xlab_user.minsec = -1;
2758     im->ximg=0;
2759     im->yimg=0;
2760     im->xsize = 400;
2761     im->ysize = 100;
2762     im->step = 0;
2763     im->ylegend[0] = '\0';
2764     im->title[0] = '\0';
2765     im->minval = DNAN;
2766     im->maxval = DNAN;
2767     im->unitsexponent= 9999;
2768     im->unitslength= 6;
2769     im->symbol = ' ';
2770     im->viewfactor = 1.0;
2771     im->extra_flags= 0;
2772     im->rigid = 0;
2773     im->gridfit = 1;
2774     im->imginfo = NULL;
2775     im->lazy = 0;
2776     im->logarithmic = 0;
2777     im->ygridstep = DNAN;
2778     im->draw_x_grid = 1;
2779     im->draw_y_grid = 1;
2780     im->base = 1000;
2781     im->prt_c = 0;
2782     im->gdes_c = 0;
2783     im->gdes = NULL;
2784     im->canvas = gfx_new_canvas();
2785     im->grid_dash_on = 1;
2786     im->grid_dash_off = 1;
2787     im->tabwidth = 40.0;
2788
2789     for(i=0;i<DIM(graph_col);i++)
2790         im->graph_col[i]=graph_col[i];
2791
2792 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2793     {
2794             char *windir;
2795             char rrd_win_default_font[1000];
2796             windir = getenv("windir");
2797             /* %windir% is something like D:\windows or C:\winnt */
2798             if (windir != NULL) {
2799                     strncpy(rrd_win_default_font,windir,999);
2800                     rrd_win_default_font[999] = '\0';
2801                     strcat(rrd_win_default_font,"\\fonts\\");
2802                     strcat(rrd_win_default_font,RRD_DEFAULT_FONT);
2803                     for(i=0;i<DIM(text_prop);i++){
2804                             strncpy(text_prop[i].font,rrd_win_default_font,sizeof(text_prop[i].font)-1);
2805                             text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2806                      }
2807              }
2808     }
2809 #endif
2810     {
2811             char *deffont;
2812             deffont = getenv("RRD_DEFAULT_FONT");
2813             if (deffont != NULL) {
2814                  for(i=0;i<DIM(text_prop);i++){
2815                         strncpy(text_prop[i].font,deffont,sizeof(text_prop[i].font)-1);
2816                         text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2817                  }
2818             }
2819     }
2820     for(i=0;i<DIM(text_prop);i++){
2821       im->text_prop[i].size = text_prop[i].size;
2822       strcpy(im->text_prop[i].font,text_prop[i].font);
2823     }
2824 }
2825
2826 void
2827 rrd_graph_options(int argc, char *argv[],image_desc_t *im)
2828 {
2829     int                 stroff;
2830     char                *parsetime_error = NULL;
2831     char                scan_gtm[12],scan_mtm[12],scan_ltm[12],col_nam[12];
2832     time_t              start_tmp=0,end_tmp=0;
2833     long                long_tmp;
2834     struct rrd_time_value       start_tv, end_tv;
2835     gfx_color_t         color;
2836     optind = 0; opterr = 0;  /* initialize getopt */
2837
2838     parsetime("end-24h", &start_tv);
2839     parsetime("now", &end_tv);
2840
2841     while (1){
2842         static struct option long_options[] =
2843         {
2844             {"start",      required_argument, 0,  's'},
2845             {"end",        required_argument, 0,  'e'},
2846             {"x-grid",     required_argument, 0,  'x'},
2847             {"y-grid",     required_argument, 0,  'y'},
2848             {"vertical-label",required_argument,0,'v'},
2849             {"width",      required_argument, 0,  'w'},
2850             {"height",     required_argument, 0,  'h'},
2851             {"interlaced", no_argument,       0,  'i'},
2852             {"upper-limit",required_argument, 0,  'u'},
2853             {"lower-limit",required_argument, 0,  'l'},
2854             {"rigid",      no_argument,       0,  'r'},
2855             {"base",       required_argument, 0,  'b'},
2856             {"logarithmic",no_argument,       0,  'o'},
2857             {"color",      required_argument, 0,  'c'},
2858             {"font",       required_argument, 0,  'n'},
2859             {"title",      required_argument, 0,  't'},
2860             {"imginfo",    required_argument, 0,  'f'},
2861             {"imgformat",  required_argument, 0,  'a'},
2862             {"lazy",       no_argument,       0,  'z'},
2863             {"zoom",       required_argument, 0,  'm'},
2864             {"no-legend",  no_argument,       0,  'g'},
2865             {"force-rules-legend",no_argument,0,  'F'},
2866             {"only-graph", no_argument,       0,  'j'},
2867             {"alt-y-grid", no_argument,       0,  'Y'},
2868             {"no-minor",   no_argument,       0,  'I'},
2869             {"alt-autoscale", no_argument,    0,  'A'},
2870             {"alt-autoscale-max", no_argument, 0, 'M'},
2871             {"no-gridfit", no_argument,       0,   'N'},
2872             {"units-exponent",required_argument, 0, 'X'},
2873             {"units-length",required_argument, 0, 'L'},
2874             {"step",       required_argument, 0,    'S'},
2875             {"tabwidth",   required_argument, 0,    'T'},
2876             {0,0,0,0}};
2877         int option_index = 0;
2878         int opt;
2879         int col_start,col_end;
2880
2881         opt = getopt_long(argc, argv,
2882                          "s:e:x:y:v:w:h:iu:l:rb:oc:n:m:t:f:a:I:zgjFYAMX:L:S:T:N",
2883                           long_options, &option_index);
2884
2885         if (opt == EOF)
2886             break;
2887
2888         switch(opt) {
2889         case 'I':
2890             im->extra_flags |= NOMINOR;
2891             break;
2892         case 'Y':
2893             im->extra_flags |= ALTYGRID;
2894             break;
2895         case 'A':
2896             im->extra_flags |= ALTAUTOSCALE;
2897             break;
2898         case 'M':
2899             im->extra_flags |= ALTAUTOSCALE_MAX;
2900             break;
2901         case 'j':
2902            im->extra_flags |= ONLY_GRAPH;
2903            break;
2904         case 'g':
2905             im->extra_flags |= NOLEGEND;
2906             break;
2907         case 'F':
2908             im->extra_flags |= FORCE_RULES_LEGEND;
2909             break;
2910         case 'X':
2911             im->unitsexponent = atoi(optarg);
2912             break;
2913         case 'L':
2914             im->unitslength = atoi(optarg);
2915             break;
2916         case 'T':
2917             im->tabwidth = atof(optarg);
2918             break;
2919         case 'S':
2920             im->step =  atoi(optarg);
2921             break;
2922         case 'N':
2923             im->gridfit = 0;
2924             break;
2925         case 's':
2926             if ((parsetime_error = parsetime(optarg, &start_tv))) {
2927                 rrd_set_error( "start time: %s", parsetime_error );
2928                 return;
2929             }
2930             break;
2931         case 'e':
2932             if ((parsetime_error = parsetime(optarg, &end_tv))) {
2933                 rrd_set_error( "end time: %s", parsetime_error );
2934                 return;
2935             }
2936             break;
2937         case 'x':
2938             if(strcmp(optarg,"none") == 0){
2939               im->draw_x_grid=0;
2940               break;
2941             };
2942
2943             if(sscanf(optarg,
2944                       "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
2945                       scan_gtm,
2946                       &im->xlab_user.gridst,
2947                       scan_mtm,
2948                       &im->xlab_user.mgridst,
2949                       scan_ltm,
2950                       &im->xlab_user.labst,
2951                       &im->xlab_user.precis,
2952                       &stroff) == 7 && stroff != 0){
2953                 strncpy(im->xlab_form, optarg+stroff, sizeof(im->xlab_form) - 1);
2954                 im->xlab_form[sizeof(im->xlab_form)-1] = '\0';
2955                 if((int)(im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1){
2956                     rrd_set_error("unknown keyword %s",scan_gtm);
2957                     return;
2958                 } else if ((int)(im->xlab_user.mgridtm = tmt_conv(scan_mtm)) == -1){
2959                     rrd_set_error("unknown keyword %s",scan_mtm);
2960                     return;
2961                 } else if ((int)(im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1){
2962                     rrd_set_error("unknown keyword %s",scan_ltm);
2963                     return;
2964                 }
2965                 im->xlab_user.minsec = 1;
2966                 im->xlab_user.stst = im->xlab_form;
2967             } else {
2968                 rrd_set_error("invalid x-grid format");
2969                 return;
2970             }
2971             break;
2972         case 'y':
2973
2974             if(strcmp(optarg,"none") == 0){
2975               im->draw_y_grid=0;
2976               break;
2977             };
2978
2979             if(sscanf(optarg,
2980                       "%lf:%d",
2981                       &im->ygridstep,
2982                       &im->ylabfact) == 2) {
2983                 if(im->ygridstep<=0){
2984                     rrd_set_error("grid step must be > 0");
2985                     return;
2986                 } else if (im->ylabfact < 1){
2987                     rrd_set_error("label factor must be > 0");
2988                     return;
2989                 }
2990             } else {
2991                 rrd_set_error("invalid y-grid format");
2992                 return;
2993             }
2994             break;
2995         case 'v':
2996             strncpy(im->ylegend,optarg,150);
2997             im->ylegend[150]='\0';
2998             break;
2999         case 'u':
3000             im->maxval = atof(optarg);
3001             break;
3002         case 'l':
3003             im->minval = atof(optarg);
3004             break;
3005         case 'b':
3006             im->base = atol(optarg);
3007             if(im->base != 1024 && im->base != 1000 ){
3008                 rrd_set_error("the only sensible value for base apart from 1000 is 1024");
3009                 return;
3010             }
3011             break;
3012         case 'w':
3013             long_tmp = atol(optarg);
3014             if (long_tmp < 10) {
3015                 rrd_set_error("width below 10 pixels");
3016                 return;
3017             }
3018             im->xsize = long_tmp;
3019             break;
3020         case 'h':
3021             long_tmp = atol(optarg);
3022             if (long_tmp < 10) {
3023                 rrd_set_error("height below 10 pixels");
3024                 return;
3025             }
3026             im->ysize = long_tmp;
3027             break;
3028         case 'i':
3029             im->canvas->interlaced = 1;
3030             break;
3031         case 'r':
3032             im->rigid = 1;
3033             break;
3034         case 'f':
3035             im->imginfo = optarg;
3036             break;
3037         case 'a':
3038             if((int)(im->canvas->imgformat = if_conv(optarg)) == -1) {
3039                 rrd_set_error("unsupported graphics format '%s'",optarg);
3040                 return;
3041             }
3042             break;
3043         case 'z':
3044             im->lazy = 1;
3045             break;
3046         case 'o':
3047             im->logarithmic = 1;
3048             if (isnan(im->minval))
3049                 im->minval=1;
3050             break;
3051         case 'c':
3052             if(sscanf(optarg,
3053                       "%10[A-Z]#%n%8lx%n",
3054                       col_nam,&col_start,&color,&col_end) == 2){
3055                 int ci;
3056                 int col_len = col_end - col_start;
3057                 switch (col_len){
3058                         case 6:
3059                                 color = (color << 8) + 0xff /* shift left by 8 */;
3060                                 break;
3061                         case 8:
3062                                 break;
3063                         default:
3064                                 rrd_set_error("the color format is #RRGGBB[AA]");
3065                                 return;
3066                 }
3067                 if((ci=grc_conv(col_nam)) != -1){
3068                     im->graph_col[ci]=color;
3069                 }  else {
3070                   rrd_set_error("invalid color name '%s'",col_nam);
3071                   return;
3072                 }
3073             } else {
3074                 rrd_set_error("invalid color def format");
3075                 return;
3076             }
3077             break;
3078         case 'n':{
3079             char prop[15];
3080             double size = 1;
3081             char font[1024];
3082
3083             if(sscanf(optarg,
3084                                 "%10[A-Z]:%lf:%1000s",
3085                                 prop,&size,font) == 3){
3086                 int sindex;
3087                 if((sindex=text_prop_conv(prop)) != -1){
3088                     im->text_prop[sindex].size=size;
3089                     strcpy(im->text_prop[sindex].font,font);
3090                     if (sindex==0) { /* the default */
3091                         im->text_prop[TEXT_PROP_TITLE].size=size;
3092                         strcpy(im->text_prop[TEXT_PROP_TITLE].font,font);
3093                         im->text_prop[TEXT_PROP_AXIS].size=size;
3094                         strcpy(im->text_prop[TEXT_PROP_AXIS].font,font);
3095                         im->text_prop[TEXT_PROP_UNIT].size=size;
3096                         strcpy(im->text_prop[TEXT_PROP_UNIT].font,font);
3097                         im->text_prop[TEXT_PROP_LEGEND].size=size;
3098                         strcpy(im->text_prop[TEXT_PROP_LEGEND].font,font);
3099                     }
3100                 } else {
3101                     rrd_set_error("invalid fonttag '%s'",prop);
3102                     return;
3103                 }
3104             } else {
3105                 rrd_set_error("invalid text property format");
3106                 return;
3107             }
3108             break;
3109         }
3110         case 'm':
3111             im->canvas->zoom = atof(optarg);
3112             if (im->canvas->zoom <= 0.0) {
3113                 rrd_set_error("zoom factor must be > 0");
3114                 return;
3115             }
3116           break;
3117         case 't':
3118             strncpy(im->title,optarg,150);
3119             im->title[150]='\0';
3120             break;
3121
3122         case '?':
3123             if (optopt != 0)
3124                 rrd_set_error("unknown option '%c'", optopt);
3125             else
3126                 rrd_set_error("unknown option '%s'",argv[optind-1]);
3127             return;
3128         }
3129     }
3130
3131     if (optind >= argc) {
3132        rrd_set_error("missing filename");
3133        return;
3134     }
3135
3136     if (im->logarithmic == 1 && (im->minval <= 0 || isnan(im->minval))){
3137         rrd_set_error("for a logarithmic yaxis you must specify a lower-limit > 0");
3138         return;
3139     }
3140
3141     if (proc_start_end(&start_tv,&end_tv,&start_tmp,&end_tmp) == -1){
3142         /* error string is set in parsetime.c */
3143         return;
3144     }
3145
3146     if (start_tmp < 3600*24*365*10){
3147         rrd_set_error("the first entry to fetch should be after 1980 (%ld)",start_tmp);
3148         return;
3149     }
3150
3151     if (end_tmp < start_tmp) {
3152         rrd_set_error("start (%ld) should be less than end (%ld)",
3153                start_tmp, end_tmp);
3154         return;
3155     }
3156
3157     im->start = start_tmp;
3158     im->end = end_tmp;
3159     im->step = max((long)im->step, (im->end-im->start)/im->xsize);
3160 }
3161
3162 int
3163 rrd_graph_check_vname(image_desc_t *im, char *varname, char *err)
3164 {
3165     if ((im->gdes[im->gdes_c-1].vidx=find_var(im,varname))==-1) {
3166         rrd_set_error("Unknown variable '%s' in %s",varname,err);
3167         return -1;
3168     }
3169     return 0;
3170 }
3171 int
3172 rrd_graph_color(image_desc_t *im, char *var, char *err, int optional)
3173 {
3174     char *color;
3175     graph_desc_t *gdp=&im->gdes[im->gdes_c-1];
3176
3177     color=strstr(var,"#");
3178     if (color==NULL) {
3179         if (optional==0) {
3180             rrd_set_error("Found no color in %s",err);
3181             return 0;
3182         }
3183         return 0;
3184     } else {
3185         int n=0;
3186         char *rest;
3187         gfx_color_t    col;
3188
3189         rest=strstr(color,":");
3190         if (rest!=NULL)
3191             n=rest-color;
3192         else
3193             n=strlen(color);
3194
3195         switch (n) {
3196             case 7:
3197                 sscanf(color,"#%6lx%n",&col,&n);
3198                 col = (col << 8) + 0xff /* shift left by 8 */;
3199                 if (n!=7) rrd_set_error("Color problem in %s",err);
3200                 break;
3201             case 9:
3202                 sscanf(color,"#%8lx%n",&col,&n);
3203                 if (n==9) break;
3204             default:
3205                 rrd_set_error("Color problem in %s",err);
3206         }
3207         if (rrd_test_error()) return 0;
3208         gdp->col = col;
3209         return n;
3210     }
3211 }
3212
3213
3214 int bad_format(char *fmt) {
3215     char *ptr;
3216     int n=0;
3217     ptr = fmt;
3218     while (*ptr != '\0')
3219         if (*ptr++ == '%') {
3220
3221              /* line cannot end with percent char */
3222              if (*ptr == '\0') return 1;
3223
3224              /* '%s', '%S' and '%%' are allowed */
3225              if (*ptr == 's' || *ptr == 'S' || *ptr == '%') ptr++;
3226
3227              /* or else '% 6.2lf' and such are allowed */
3228              else {
3229
3230                  /* optional padding character */
3231                  if (*ptr == ' ' || *ptr == '+' || *ptr == '-') ptr++;
3232
3233                  /* This should take care of 'm.n' with all three optional */
3234                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3235                  if (*ptr == '.') ptr++;
3236                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3237
3238                  /* Either 'le', 'lf' or 'lg' must follow here */
3239                  if (*ptr++ != 'l') return 1;
3240                  if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g') ptr++;
3241                  else return 1;
3242                  n++;
3243             }
3244          }
3245
3246       return (n!=1);
3247 }
3248
3249
3250 int
3251 vdef_parse(gdes,str)
3252 struct graph_desc_t *gdes;
3253 char *str;
3254 {
3255     /* A VDEF currently is either "func" or "param,func"
3256      * so the parsing is rather simple.  Change if needed.
3257      */
3258     double      param;
3259     char        func[30];
3260     int         n;
3261
3262     n=0;
3263     sscanf(str,"%le,%29[A-Z]%n",&param,func,&n);
3264     if (n== (int)strlen(str)) { /* matched */
3265         ;
3266     } else {
3267         n=0;
3268         sscanf(str,"%29[A-Z]%n",func,&n);
3269         if (n== (int)strlen(str)) { /* matched */
3270             param=DNAN;
3271         } else {
3272             rrd_set_error("Unknown function string '%s' in VDEF '%s'"
3273                 ,str
3274                 ,gdes->vname
3275                 );
3276             return -1;
3277         }
3278     }
3279     if          (!strcmp("PERCENT",func)) gdes->vf.op = VDEF_PERCENT;
3280     else if     (!strcmp("MAXIMUM",func)) gdes->vf.op = VDEF_MAXIMUM;
3281     else if     (!strcmp("AVERAGE",func)) gdes->vf.op = VDEF_AVERAGE;
3282     else if     (!strcmp("MINIMUM",func)) gdes->vf.op = VDEF_MINIMUM;
3283     else if     (!strcmp("TOTAL",  func)) gdes->vf.op = VDEF_TOTAL;
3284     else if     (!strcmp("FIRST",  func)) gdes->vf.op = VDEF_FIRST;
3285     else if     (!strcmp("LAST",   func)) gdes->vf.op = VDEF_LAST;
3286     else {
3287         rrd_set_error("Unknown function '%s' in VDEF '%s'\n"
3288             ,func
3289             ,gdes->vname
3290             );
3291         return -1;
3292     };
3293
3294     switch (gdes->vf.op) {
3295         case VDEF_PERCENT:
3296             if (isnan(param)) { /* no parameter given */
3297                 rrd_set_error("Function '%s' needs parameter in VDEF '%s'\n"
3298                     ,func
3299                     ,gdes->vname
3300                     );
3301                 return -1;
3302             };
3303             if (param>=0.0 && param<=100.0) {
3304                 gdes->vf.param = param;
3305                 gdes->vf.val   = DNAN;  /* undefined */
3306                 gdes->vf.when  = 0;     /* undefined */
3307             } else {
3308                 rrd_set_error("Parameter '%f' out of range in VDEF '%s'\n"
3309                     ,param
3310                     ,gdes->vname
3311                     );
3312                 return -1;
3313             };
3314             break;
3315         case VDEF_MAXIMUM:
3316         case VDEF_AVERAGE:
3317         case VDEF_MINIMUM:
3318         case VDEF_TOTAL:
3319         case VDEF_FIRST:
3320         case VDEF_LAST:
3321             if (isnan(param)) {
3322                 gdes->vf.param = DNAN;
3323                 gdes->vf.val   = DNAN;
3324                 gdes->vf.when  = 0;
3325             } else {
3326                 rrd_set_error("Function '%s' needs no parameter in VDEF '%s'\n"
3327                     ,func
3328                     ,gdes->vname
3329                     );
3330                 return -1;
3331             };
3332             break;
3333     };
3334     return 0;
3335 }
3336
3337
3338 int
3339 vdef_calc(im,gdi)
3340 image_desc_t *im;
3341 int gdi;
3342 {
3343     graph_desc_t        *src,*dst;
3344     rrd_value_t         *data;
3345     long                step,steps;
3346
3347     dst = &im->gdes[gdi];
3348     src = &im->gdes[dst->vidx];
3349     data = src->data + src->ds;
3350     steps = (src->end - src->start) / src->step;
3351
3352 #if 0
3353 printf("DEBUG: start == %lu, end == %lu, %lu steps\n"
3354     ,src->start
3355     ,src->end
3356     ,steps
3357     );
3358 #endif
3359
3360     switch (dst->vf.op) {
3361         case VDEF_PERCENT: {
3362                 rrd_value_t *   array;
3363                 int             field;
3364
3365
3366                 if ((array = malloc(steps*sizeof(double)))==NULL) {
3367                     rrd_set_error("malloc VDEV_PERCENT");
3368                     return -1;
3369                 }
3370                 for (step=0;step < steps; step++) {
3371                     array[step]=data[step*src->ds_cnt];
3372                 }
3373                 qsort(array,step,sizeof(double),vdef_percent_compar);
3374
3375                 field = (steps-1)*dst->vf.param/100;
3376                 dst->vf.val  = array[field];
3377                 dst->vf.when = 0;       /* no time component */
3378                 free(array);
3379 #if 0
3380 for(step=0;step<steps;step++)
3381 printf("DEBUG: %3li:%10.2f %c\n",step,array[step],step==field?'*':' ');
3382 #endif
3383             }
3384             break;
3385         case VDEF_MAXIMUM:
3386             step=0;
3387             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3388             if (step == steps) {
3389                 dst->vf.val  = DNAN;
3390                 dst->vf.when = 0;
3391             } else {
3392                 dst->vf.val  = data[step*src->ds_cnt];
3393                 dst->vf.when = src->start + (step+1)*src->step;
3394             }
3395             while (step != steps) {
3396                 if (finite(data[step*src->ds_cnt])) {
3397                     if (data[step*src->ds_cnt] > dst->vf.val) {
3398                         dst->vf.val  = data[step*src->ds_cnt];
3399                         dst->vf.when = src->start + (step+1)*src->step;
3400                     }
3401                 }
3402                 step++;
3403             }
3404             break;
3405         case VDEF_TOTAL:
3406         case VDEF_AVERAGE: {
3407             int cnt=0;
3408             double sum=0.0;
3409             for (step=0;step<steps;step++) {
3410                 if (finite(data[step*src->ds_cnt])) {
3411                     sum += data[step*src->ds_cnt];
3412                     cnt ++;
3413                 };
3414             }
3415             if (cnt) {
3416                 if (dst->vf.op == VDEF_TOTAL) {
3417                     dst->vf.val  = sum*src->step;
3418                     dst->vf.when = cnt*src->step;       /* not really "when" */
3419                 } else {
3420                     dst->vf.val = sum/cnt;
3421                     dst->vf.when = 0;   /* no time component */
3422                 };
3423             } else {
3424                 dst->vf.val  = DNAN;
3425                 dst->vf.when = 0;
3426             }
3427             }
3428             break;
3429         case VDEF_MINIMUM:
3430             step=0;
3431             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3432             if (step == steps) {
3433                 dst->vf.val  = DNAN;
3434                 dst->vf.when = 0;
3435             } else {
3436                 dst->vf.val  = data[step*src->ds_cnt];
3437                 dst->vf.when = src->start + (step+1)*src->step;
3438             }
3439             while (step != steps) {
3440                 if (finite(data[step*src->ds_cnt])) {
3441                     if (data[step*src->ds_cnt] < dst->vf.val) {
3442                         dst->vf.val  = data[step*src->ds_cnt];
3443                         dst->vf.when = src->start + (step+1)*src->step;
3444                     }
3445                 }
3446                 step++;
3447             }
3448             break;
3449         case VDEF_FIRST:
3450             /* The time value returned here is one step before the
3451              * actual time value.  This is the start of the first
3452              * non-NaN interval.
3453              */
3454             step=0;
3455             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3456             if (step == steps) { /* all entries were NaN */
3457                 dst->vf.val  = DNAN;
3458                 dst->vf.when = 0;
3459             } else {
3460                 dst->vf.val  = data[step*src->ds_cnt];
3461                 dst->vf.when = src->start + step*src->step;
3462             }
3463             break;
3464         case VDEF_LAST:
3465             /* The time value returned here is the
3466              * actual time value.  This is the end of the last
3467              * non-NaN interval.
3468              */
3469             step=steps-1;
3470             while (step >= 0 && isnan(data[step*src->ds_cnt])) step--;
3471             if (step < 0) { /* all entries were NaN */
3472                 dst->vf.val  = DNAN;
3473                 dst->vf.when = 0;
3474             } else {
3475                 dst->vf.val  = data[step*src->ds_cnt];
3476                 dst->vf.when = src->start + (step+1)*src->step;
3477             }
3478             break;
3479     }
3480     return 0;
3481 }
3482
3483 /* NaN < -INF < finite_values < INF */
3484 int
3485 vdef_percent_compar(a,b)
3486 const void *a,*b;
3487 {
3488     /* Equality is not returned; this doesn't hurt except
3489      * (maybe) for a little performance.
3490      */
3491
3492     /* First catch NaN values. They are smallest */
3493     if (isnan( *(double *)a )) return -1;
3494     if (isnan( *(double *)b )) return  1;
3495
3496     /* NaN doesn't reach this part so INF and -INF are extremes.
3497      * The sign from isinf() is compatible with the sign we return
3498      */
3499     if (isinf( *(double *)a )) return isinf( *(double *)a );
3500     if (isinf( *(double *)b )) return isinf( *(double *)b );
3501
3502     /* If we reach this, both values must be finite */
3503     if ( *(double *)a < *(double *)b ) return -1; else return 1;
3504 }