src/rrd_graph.c

   1 /****************************************************************************
   2  * RRDtool 1.2rc9  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         Xtitle   =0,    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         Xtitle = gfx_get_text_width(im->canvas, 0,
2156                 im->text_prop[TEXT_PROP_TITLE].font,
2157                 im->text_prop[TEXT_PROP_TITLE].size,
2158                 im->tabwidth,
2159                 im->title, 0) + 2*Xspacing;
2160         Ytitle = im->text_prop[TEXT_PROP_TITLE].size*2.5;
2161     }
2162
2163     if (elements) {
2164         Xmain=im->xsize;
2165         Ymain=im->ysize;
2166         if (im->draw_x_grid) {
2167             Yxlabel=im->text_prop[TEXT_PROP_AXIS].size *2.5;
2168         }
2169         if (im->draw_y_grid) {
2170             Xylabel=gfx_get_text_width(im->canvas, 0,
2171                         im->text_prop[TEXT_PROP_AXIS].font,
2172                         im->text_prop[TEXT_PROP_AXIS].size,
2173                         im->tabwidth,
2174                         "0", 0) * im->unitslength + im->text_prop[TEXT_PROP_AXIS].size * 2;
2175         }
2176     }
2177
2178 #ifdef WITH_PIECHART
2179     if (piechart) {
2180         im->piesize=im->xsize<im->ysize?im->xsize:im->ysize;
2181         Xpie=im->piesize;
2182         Ypie=im->piesize;
2183     }
2184 #endif
2185
2186     /* Now calculate the total size.  Insert some spacing where
2187        desired.  im->xorigin and im->yorigin need to correspond
2188        with the lower left corner of the main graph area or, if
2189        this one is not set, the imaginary box surrounding the
2190        pie chart area. */
2191
2192     /* The legend width cannot yet be determined, as a result we
2193     ** have problems adjusting the image to it.  For now, we just
2194     ** forget about it at all; the legend will have to fit in the
2195     ** size already allocated.
2196     */
2197     im->ximg = Xylabel + Xmain + 2 * Xspacing;
2198
2199 #ifdef WITH_PIECHART
2200     im->ximg  += Xpie;
2201 #endif
2202
2203     if (Xmain) im->ximg += Xspacing;
2204 #ifdef WITH_PIECHART
2205     if (Xpie) im->ximg += Xspacing;
2206 #endif
2207
2208     im->xorigin = Xspacing + Xylabel;
2209
2210     if (Xtitle > im->ximg) im->ximg = Xtitle;
2211
2212     if (Xvertical) { /* unit description */
2213         im->ximg += Xvertical;
2214         im->xorigin += Xvertical;
2215     }
2216     xtr(im,0);
2217
2218     /* The vertical size is interesting... we need to compare
2219     ** the sum of {Ytitle, Ymain, Yxlabel, Ylegend} with Yvertical
2220     ** however we need to know {Ytitle+Ymain+Yxlabel} in order to
2221     ** start even thinking about Ylegend.
2222     **
2223     ** Do it in three portions: First calculate the inner part,
2224     ** then do the legend, then adjust the total height of the img.
2225     */
2226
2227     /* reserve space for main and/or pie */
2228
2229     im->yimg = Ymain + Yxlabel;
2230
2231 #ifdef WITH_PIECHART
2232     if (im->yimg < Ypie) im->yimg = Ypie;
2233 #endif
2234
2235     im->yorigin = im->yimg - Yxlabel;
2236
2237     /* reserve space for the title *or* some padding above the graph */
2238     if (Ytitle) {
2239         im->yimg += Ytitle;
2240         im->yorigin += Ytitle;
2241     } else {
2242         im->yimg += Yspacing;
2243         im->yorigin += Yspacing;
2244     }
2245     /* reserve space for padding below the graph */
2246     im->yimg += Yspacing;
2247     ytr(im,DNAN);
2248
2249     /* Determine where to place the legends onto the image.
2250     ** Adjust im->yimg to match the space requirements.
2251     */
2252     if(leg_place(im)==-1)
2253         return -1;
2254
2255     /* last of three steps: check total height of image */
2256     if (im->yimg < Yvertical) im->yimg = Yvertical;
2257
2258 #if 0
2259     if (Xlegend > im->ximg) {
2260         im->ximg = Xlegend;
2261         /* reposition Pie */
2262     }
2263 #endif
2264
2265 #ifdef WITH_PIECHART
2266     /* The pie is placed in the upper right hand corner,
2267     ** just below the title (if any) and with sufficient
2268     ** padding.
2269     */
2270     if (elements) {
2271         im->pie_x = im->ximg - Xspacing - Xpie/2;
2272         im->pie_y = im->yorigin-Ymain+Ypie/2;
2273     } else {
2274         im->pie_x = im->ximg/2;
2275         im->pie_y = im->yorigin-Ypie/2;
2276     }
2277 #endif
2278
2279     return 0;
2280 }
2281
2282 /* draw that picture thing ... */
2283 int
2284 graph_paint(image_desc_t *im, char ***calcpr)
2285 {
2286   int i,ii;
2287   int lazy =     lazy_check(im);
2288 #ifdef WITH_PIECHART
2289   int piechart = 0;
2290   double PieStart=0.0;
2291 #endif
2292   FILE  *fo;
2293   gfx_node_t *node;
2294
2295   double areazero = 0.0;
2296   enum gf_en stack_gf = GF_PRINT;
2297   graph_desc_t *lastgdes = NULL;
2298
2299   /* if we are lazy and there is nothing to PRINT ... quit now */
2300   if (lazy && im->prt_c==0) return 0;
2301
2302   /* pull the data from the rrd files ... */
2303
2304   if(data_fetch(im)==-1)
2305     return -1;
2306
2307   /* evaluate VDEF and CDEF operations ... */
2308   if(data_calc(im)==-1)
2309     return -1;
2310
2311 #ifdef WITH_PIECHART
2312   /* check if we need to draw a piechart */
2313   for(i=0;i<im->gdes_c;i++){
2314     if (im->gdes[i].gf == GF_PART) {
2315       piechart=1;
2316       break;
2317     }
2318   }
2319 #endif
2320
2321   /* calculate and PRINT and GPRINT definitions. We have to do it at
2322    * this point because it will affect the length of the legends
2323    * if there are no graph elements we stop here ...
2324    * if we are lazy, try to quit ...
2325    */
2326   i=print_calc(im,calcpr);
2327   if(i<0) return -1;
2328   if(((i==0)
2329 #ifdef WITH_PIECHART
2330 &&(piechart==0)
2331 #endif
2332 ) || lazy) return 0;
2333
2334 #ifdef WITH_PIECHART
2335   /* If there's only the pie chart to draw, signal this */
2336   if (i==0) piechart=2;
2337 #endif
2338
2339   /* get actual drawing data and find min and max values*/
2340   if(data_proc(im)==-1)
2341     return -1;
2342
2343   if(!im->logarithmic){si_unit(im);}        /* identify si magnitude Kilo, Mega Giga ? */
2344
2345   if(!im->rigid && ! im->logarithmic)
2346     expand_range(im);   /* make sure the upper and lower limit are
2347                            sensible values */
2348
2349   if (!calc_horizontal_grid(im))
2350     return -1;
2351
2352   if (im->gridfit)
2353     apply_gridfit(im);
2354
2355
2356 /**************************************************************
2357  *** Calculating sizes and locations became a bit confusing ***
2358  *** so I moved this into a separate function.              ***
2359  **************************************************************/
2360   if(graph_size_location(im,i
2361 #ifdef WITH_PIECHART
2362 ,piechart
2363 #endif
2364 )==-1)
2365     return -1;
2366
2367   /* the actual graph is created by going through the individual
2368      graph elements and then drawing them */
2369
2370   node=gfx_new_area ( im->canvas,
2371                       0, 0,
2372                       im->ximg, 0,
2373                       im->ximg, im->yimg,
2374                       im->graph_col[GRC_BACK]);
2375
2376   gfx_add_point(node,0, im->yimg);
2377
2378 #ifdef WITH_PIECHART
2379   if (piechart != 2) {
2380 #endif
2381     node=gfx_new_area ( im->canvas,
2382                       im->xorigin,             im->yorigin,
2383                       im->xorigin + im->xsize, im->yorigin,
2384                       im->xorigin + im->xsize, im->yorigin-im->ysize,
2385                       im->graph_col[GRC_CANVAS]);
2386
2387     gfx_add_point(node,im->xorigin, im->yorigin - im->ysize);
2388
2389     if (im->minval > 0.0)
2390       areazero = im->minval;
2391     if (im->maxval < 0.0)
2392       areazero = im->maxval;
2393 #ifdef WITH_PIECHART
2394    }
2395 #endif
2396
2397 #ifdef WITH_PIECHART
2398   if (piechart) {
2399     pie_part(im,im->graph_col[GRC_CANVAS],im->pie_x,im->pie_y,im->piesize*0.5,0,2*M_PI);
2400   }
2401 #endif
2402
2403   for(i=0;i<im->gdes_c;i++){
2404     switch(im->gdes[i].gf){
2405     case GF_CDEF:
2406     case GF_VDEF:
2407     case GF_DEF:
2408     case GF_PRINT:
2409     case GF_GPRINT:
2410     case GF_COMMENT:
2411     case GF_HRULE:
2412     case GF_VRULE:
2413     case GF_XPORT:
2414     case GF_SHIFT:
2415       break;
2416     case GF_TICK:
2417       for (ii = 0; ii < im->xsize; ii++)
2418         {
2419           if (!isnan(im->gdes[i].p_data[ii]) &&
2420               im->gdes[i].p_data[ii] > 0.0)
2421             {
2422               /* generate a tick */
2423               gfx_new_line(im->canvas, im -> xorigin + ii,
2424                            im -> yorigin - (im -> gdes[i].yrule * im -> ysize),
2425                            im -> xorigin + ii,
2426                            im -> yorigin,
2427                            1.0,
2428                            im -> gdes[i].col );
2429             }
2430         }
2431       break;
2432     case GF_LINE:
2433     case GF_AREA:
2434       stack_gf = im->gdes[i].gf;
2435     case GF_STACK:
2436       /* fix data points at oo and -oo */
2437       for(ii=0;ii<im->xsize;ii++){
2438         if (isinf(im->gdes[i].p_data[ii])){
2439           if (im->gdes[i].p_data[ii] > 0) {
2440             im->gdes[i].p_data[ii] = im->maxval ;
2441           } else {
2442             im->gdes[i].p_data[ii] = im->minval ;
2443           }
2444
2445         }
2446       } /* for */
2447
2448       /* *******************************************************
2449                    ___
2450                   |   |    ___
2451               ____|   |   |   |
2452               |       |___|
2453        -------|---------------------------------------
2454
2455       if we know the value of y at time t was a then
2456       we draw a square from t-1 to t with the value a.
2457
2458       ********************************************************* */
2459       if (im->gdes[i].col != 0x0){
2460         /* GF_LINE and friend */
2461         if(stack_gf == GF_LINE ){
2462           node = NULL;
2463           for(ii=1;ii<im->xsize;ii++){
2464             if (isnan(im->gdes[i].p_data[ii])){
2465                 node = NULL;
2466                 continue;
2467             }
2468             if ( node == NULL ) {
2469                  node = gfx_new_line(im->canvas,
2470                                     ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2471                                     ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2472                                     im->gdes[i].linewidth,
2473                                     im->gdes[i].col);
2474              } else {
2475                gfx_add_point(node,ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2476                gfx_add_point(node,ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2477              };
2478
2479           }
2480         } else {
2481           for(ii=1;ii<im->xsize;ii++){
2482             /* keep things simple for now, just draw these bars
2483                do not try to build a big and complex area */
2484             float ybase,ytop;
2485             if ( isnan(im->gdes[i].p_data[ii]) ) {
2486                 continue;
2487             }
2488             ytop = ytr(im,im->gdes[i].p_data[ii]);
2489             if ( im->gdes[i].stack ) {
2490                   ybase = ytr(im,lastgdes->p_data[ii]);
2491             } else {
2492                   ybase = ytr(im,areazero);
2493             }
2494             if ( ybase == ytop ){
2495                 continue;
2496             }
2497             node = gfx_new_area(im->canvas,
2498                                 ii-1+im->xorigin,ybase,
2499                                 ii-1+im->xorigin,ytop,
2500                                 ii+im->xorigin,ytop,
2501                                 im->gdes[i].col
2502                                );
2503             gfx_add_point(node,ii+im->xorigin,ybase);
2504           }
2505         } /* else GF_LINE */
2506       } /* if color != 0x0 */
2507       /* make sure we do not run into trouble when stacking on NaN */
2508       for(ii=0;ii<im->xsize;ii++){
2509         if (isnan(im->gdes[i].p_data[ii])) {
2510           if (lastgdes && (im->gdes[i].stack)) {
2511             im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
2512           } else {
2513             im->gdes[i].p_data[ii] =  ytr(im,areazero);
2514           }
2515         }
2516       }
2517       lastgdes = &(im->gdes[i]);
2518       break;
2519 #ifdef WITH_PIECHART
2520     case GF_PART:
2521       if(isnan(im->gdes[i].yrule)) /* fetch variable */
2522         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2523
2524       if (finite(im->gdes[i].yrule)) {  /* even the fetched var can be NaN */
2525         pie_part(im,im->gdes[i].col,
2526                 im->pie_x,im->pie_y,im->piesize*0.4,
2527                 M_PI*2.0*PieStart/100.0,
2528                 M_PI*2.0*(PieStart+im->gdes[i].yrule)/100.0);
2529         PieStart += im->gdes[i].yrule;
2530       }
2531       break;
2532 #endif
2533
2534     } /* switch */
2535   }
2536 #ifdef WITH_PIECHART
2537   if (piechart==2) {
2538     im->draw_x_grid=0;
2539     im->draw_y_grid=0;
2540   }
2541 #endif
2542
2543
2544   /* grid_paint also does the text */
2545   if( !(im->extra_flags & ONLY_GRAPH) )
2546     grid_paint(im);
2547
2548
2549   if( !(im->extra_flags & ONLY_GRAPH) )
2550       axis_paint(im);
2551
2552   /* the RULES are the last thing to paint ... */
2553   for(i=0;i<im->gdes_c;i++){
2554
2555     switch(im->gdes[i].gf){
2556     case GF_HRULE:
2557       if(isnan(im->gdes[i].yrule)) { /* fetch variable */
2558         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2559       };
2560       if(im->gdes[i].yrule >= im->minval
2561          && im->gdes[i].yrule <= im->maxval)
2562         gfx_new_line(im->canvas,
2563                      im->xorigin,ytr(im,im->gdes[i].yrule),
2564                      im->xorigin+im->xsize,ytr(im,im->gdes[i].yrule),
2565                      1.0,im->gdes[i].col);
2566       break;
2567     case GF_VRULE:
2568       if(im->gdes[i].xrule == 0) { /* fetch variable */
2569         im->gdes[i].xrule = im->gdes[im->gdes[i].vidx].vf.when;
2570       };
2571       if(im->gdes[i].xrule >= im->start
2572          && im->gdes[i].xrule <= im->end)
2573         gfx_new_line(im->canvas,
2574                      xtr(im,im->gdes[i].xrule),im->yorigin,
2575                      xtr(im,im->gdes[i].xrule),im->yorigin-im->ysize,
2576                      1.0,im->gdes[i].col);
2577       break;
2578     default:
2579       break;
2580     }
2581   }
2582
2583
2584   if (strcmp(im->graphfile,"-")==0) {
2585     fo = im->graphhandle ? im->graphhandle : stdout;
2586 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2587     /* Change translation mode for stdout to BINARY */
2588     _setmode( _fileno( fo ), O_BINARY );
2589 #endif
2590   } else {
2591     if ((fo = fopen(im->graphfile,"wb")) == NULL) {
2592       rrd_set_error("Opening '%s' for write: %s",im->graphfile,
2593                     rrd_strerror(errno));
2594       return (-1);
2595     }
2596   }
2597   gfx_render (im->canvas,im->ximg,im->yimg,0x0,fo);
2598   if (strcmp(im->graphfile,"-") != 0)
2599     fclose(fo);
2600   return 0;
2601 }
2602
2603
2604 /*****************************************************
2605  * graph stuff
2606  *****************************************************/
2607
2608 int
2609 gdes_alloc(image_desc_t *im){
2610
2611     im->gdes_c++;
2612     if ((im->gdes = (graph_desc_t *) rrd_realloc(im->gdes, (im->gdes_c)
2613                                            * sizeof(graph_desc_t)))==NULL){
2614         rrd_set_error("realloc graph_descs");
2615         return -1;
2616     }
2617
2618
2619     im->gdes[im->gdes_c-1].step=im->step;
2620     im->gdes[im->gdes_c-1].stack=0;
2621     im->gdes[im->gdes_c-1].debug=0;
2622     im->gdes[im->gdes_c-1].start=im->start;
2623     im->gdes[im->gdes_c-1].end=im->end;
2624     im->gdes[im->gdes_c-1].vname[0]='\0';
2625     im->gdes[im->gdes_c-1].data=NULL;
2626     im->gdes[im->gdes_c-1].ds_namv=NULL;
2627     im->gdes[im->gdes_c-1].data_first=0;
2628     im->gdes[im->gdes_c-1].p_data=NULL;
2629     im->gdes[im->gdes_c-1].rpnp=NULL;
2630     im->gdes[im->gdes_c-1].shift=0;
2631     im->gdes[im->gdes_c-1].col = 0x0;
2632     im->gdes[im->gdes_c-1].legend[0]='\0';
2633     im->gdes[im->gdes_c-1].format[0]='\0';
2634     im->gdes[im->gdes_c-1].rrd[0]='\0';
2635     im->gdes[im->gdes_c-1].ds=-1;
2636     im->gdes[im->gdes_c-1].p_data=NULL;
2637     im->gdes[im->gdes_c-1].yrule=DNAN;
2638     im->gdes[im->gdes_c-1].xrule=0;
2639     return 0;
2640 }
2641
2642 /* copies input untill the first unescaped colon is found
2643    or until input ends. backslashes have to be escaped as well */
2644 int
2645 scan_for_col(char *input, int len, char *output)
2646 {
2647     int inp,outp=0;
2648     for (inp=0;
2649          inp < len &&
2650            input[inp] != ':' &&
2651            input[inp] != '\0';
2652          inp++){
2653       if (input[inp] == '\\' &&
2654           input[inp+1] != '\0' &&
2655           (input[inp+1] == '\\' ||
2656            input[inp+1] == ':')){
2657         output[outp++] = input[++inp];
2658       }
2659       else {
2660         output[outp++] = input[inp];
2661       }
2662     }
2663     output[outp] = '\0';
2664     return inp;
2665 }
2666 /* Some surgery done on this function, it became ridiculously big.
2667 ** Things moved:
2668 ** - initializing     now in rrd_graph_init()
2669 ** - options parsing  now in rrd_graph_options()
2670 ** - script parsing   now in rrd_graph_script()
2671 */
2672 int
2673 rrd_graph(int argc, char **argv, char ***prdata, int *xsize, int *ysize, FILE *stream, double *ymin, double *ymax)
2674 {
2675     image_desc_t   im;
2676
2677     rrd_graph_init(&im);
2678     im.graphhandle = stream;
2679
2680     rrd_graph_options(argc,argv,&im);
2681     if (rrd_test_error()) {
2682         im_free(&im);
2683         return -1;
2684     }
2685
2686     if (strlen(argv[optind])>=MAXPATH) {
2687         rrd_set_error("filename (including path) too long");
2688         im_free(&im);
2689         return -1;
2690     }
2691     strncpy(im.graphfile,argv[optind],MAXPATH-1);
2692     im.graphfile[MAXPATH-1]='\0';
2693
2694     rrd_graph_script(argc,argv,&im,1);
2695     if (rrd_test_error()) {
2696         im_free(&im);
2697         return -1;
2698     }
2699
2700     /* Everything is now read and the actual work can start */
2701
2702     (*prdata)=NULL;
2703     if (graph_paint(&im,prdata)==-1){
2704         im_free(&im);
2705         return -1;
2706     }
2707
2708     /* The image is generated and needs to be output.
2709     ** Also, if needed, print a line with information about the image.
2710     */
2711
2712     *xsize=im.ximg;
2713     *ysize=im.yimg;
2714     *ymin=im.minval;
2715     *ymax=im.maxval;
2716     if (im.imginfo) {
2717         char *filename;
2718         if (!(*prdata)) {
2719             /* maybe prdata is not allocated yet ... lets do it now */
2720             if ((*prdata = calloc(2,sizeof(char *)))==NULL) {
2721                 rrd_set_error("malloc imginfo");
2722                 return -1;
2723             };
2724         }
2725         if(((*prdata)[0] = malloc((strlen(im.imginfo)+200+strlen(im.graphfile))*sizeof(char)))
2726          ==NULL){
2727             rrd_set_error("malloc imginfo");
2728             return -1;
2729         }
2730         filename=im.graphfile+strlen(im.graphfile);
2731         while(filename > im.graphfile) {
2732             if (*(filename-1)=='/' || *(filename-1)=='\\' ) break;
2733             filename--;
2734         }
2735
2736         sprintf((*prdata)[0],im.imginfo,filename,(long)(im.canvas->zoom*im.ximg),(long)(im.canvas->zoom*im.yimg));
2737     }
2738     im_free(&im);
2739     return 0;
2740 }
2741
2742 void
2743 rrd_graph_init(image_desc_t *im)
2744 {
2745     unsigned int i;
2746
2747 #ifdef HAVE_TZSET
2748     tzset();
2749 #endif
2750 #ifdef HAVE_SETLOCALE
2751     setlocale(LC_TIME,"");
2752 #endif
2753     im->yorigin=0;
2754     im->xorigin=0;
2755     im->minval=0;
2756     im->xlab_user.minsec = -1;
2757     im->ximg=0;
2758     im->yimg=0;
2759     im->xsize = 400;
2760     im->ysize = 100;
2761     im->step = 0;
2762     im->ylegend[0] = '\0';
2763     im->title[0] = '\0';
2764     im->minval = DNAN;
2765     im->maxval = DNAN;
2766     im->unitsexponent= 9999;
2767     im->unitslength= 6;
2768     im->symbol = ' ';
2769     im->viewfactor = 1.0;
2770     im->extra_flags= 0;
2771     im->rigid = 0;
2772     im->gridfit = 1;
2773     im->imginfo = NULL;
2774     im->lazy = 0;
2775     im->logarithmic = 0;
2776     im->ygridstep = DNAN;
2777     im->draw_x_grid = 1;
2778     im->draw_y_grid = 1;
2779     im->base = 1000;
2780     im->prt_c = 0;
2781     im->gdes_c = 0;
2782     im->gdes = NULL;
2783     im->canvas = gfx_new_canvas();
2784     im->grid_dash_on = 1;
2785     im->grid_dash_off = 1;
2786     im->tabwidth = 40.0;
2787
2788     for(i=0;i<DIM(graph_col);i++)
2789         im->graph_col[i]=graph_col[i];
2790
2791 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2792     {
2793             char *windir;
2794             char rrd_win_default_font[1000];
2795             windir = getenv("windir");
2796             /* %windir% is something like D:\windows or C:\winnt */
2797             if (windir != NULL) {
2798                     strncpy(rrd_win_default_font,windir,999);
2799                     rrd_win_default_font[999] = '\0';
2800                     strcat(rrd_win_default_font,"\\fonts\\cour.ttf");
2801                     for(i=0;i<DIM(text_prop);i++){
2802                             strncpy(text_prop[i].font,rrd_win_default_font,sizeof(text_prop[i].font)-1);
2803                             text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2804                      }
2805              }
2806     }
2807 #endif
2808     {
2809             char *deffont;
2810             deffont = getenv("RRD_DEFAULT_FONT");
2811             if (deffont != NULL) {
2812                  for(i=0;i<DIM(text_prop);i++){
2813                         strncpy(text_prop[i].font,deffont,sizeof(text_prop[i].font)-1);
2814                         text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2815                  }
2816             }
2817     }
2818     for(i=0;i<DIM(text_prop);i++){
2819       im->text_prop[i].size = text_prop[i].size;
2820       strcpy(im->text_prop[i].font,text_prop[i].font);
2821     }
2822 }
2823
2824 void
2825 rrd_graph_options(int argc, char *argv[],image_desc_t *im)
2826 {
2827     int                 stroff;
2828     char                *parsetime_error = NULL;
2829     char                scan_gtm[12],scan_mtm[12],scan_ltm[12],col_nam[12];
2830     time_t              start_tmp=0,end_tmp=0;
2831     long                long_tmp;
2832     struct rrd_time_value       start_tv, end_tv;
2833     gfx_color_t         color;
2834
2835     parsetime("end-24h", &start_tv);
2836     parsetime("now", &end_tv);
2837
2838     while (1){
2839         static struct option long_options[] =
2840         {
2841             {"start",      required_argument, 0,  's'},
2842             {"end",        required_argument, 0,  'e'},
2843             {"x-grid",     required_argument, 0,  'x'},
2844             {"y-grid",     required_argument, 0,  'y'},
2845             {"vertical-label",required_argument,0,'v'},
2846             {"width",      required_argument, 0,  'w'},
2847             {"height",     required_argument, 0,  'h'},
2848             {"interlaced", no_argument,       0,  'i'},
2849             {"upper-limit",required_argument, 0,  'u'},
2850             {"lower-limit",required_argument, 0,  'l'},
2851             {"rigid",      no_argument,       0,  'r'},
2852             {"base",       required_argument, 0,  'b'},
2853             {"logarithmic",no_argument,       0,  'o'},
2854             {"color",      required_argument, 0,  'c'},
2855             {"font",       required_argument, 0,  'n'},
2856             {"title",      required_argument, 0,  't'},
2857             {"imginfo",    required_argument, 0,  'f'},
2858             {"imgformat",  required_argument, 0,  'a'},
2859             {"lazy",       no_argument,       0,  'z'},
2860             {"zoom",       required_argument, 0,  'm'},
2861             {"no-legend",  no_argument,       0,  'g'},
2862             {"force-rules-legend",no_argument,0,  'F'},
2863             {"only-graph", no_argument,       0,  'j'},
2864             {"alt-y-grid", no_argument,       0,  'Y'},
2865             {"no-minor",   no_argument,       0,  'I'},
2866             {"alt-autoscale", no_argument,    0,  'A'},
2867             {"alt-autoscale-max", no_argument, 0, 'M'},
2868             {"no-gridfit", no_argument,       0,   'N'},
2869             {"units-exponent",required_argument, 0, 'X'},
2870             {"units-length",required_argument, 0, 'L'},
2871             {"step",       required_argument, 0,    'S'},
2872             {"tabwidth",   required_argument, 0,    'T'},
2873             {0,0,0,0}};
2874         int option_index = 0;
2875         int opt;
2876         int col_start,col_end;
2877
2878         opt = getopt_long(argc, argv,
2879                          "s:e:x:y:v:w:h:iu:l:rb:oc:n:m:t:f:a:I:zgjFYAMX:L:S:T:N",
2880                           long_options, &option_index);
2881
2882         if (opt == EOF)
2883             break;
2884
2885         switch(opt) {
2886         case 'I':
2887             im->extra_flags |= NOMINOR;
2888             break;
2889         case 'Y':
2890             im->extra_flags |= ALTYGRID;
2891             break;
2892         case 'A':
2893             im->extra_flags |= ALTAUTOSCALE;
2894             break;
2895         case 'M':
2896             im->extra_flags |= ALTAUTOSCALE_MAX;
2897             break;
2898         case 'j':
2899            im->extra_flags |= ONLY_GRAPH;
2900            break;
2901         case 'g':
2902             im->extra_flags |= NOLEGEND;
2903             break;
2904         case 'F':
2905             im->extra_flags |= FORCE_RULES_LEGEND;
2906             break;
2907         case 'X':
2908             im->unitsexponent = atoi(optarg);
2909             break;
2910         case 'L':
2911             im->unitslength = atoi(optarg);
2912             break;
2913         case 'T':
2914             im->tabwidth = atof(optarg);
2915             break;
2916         case 'S':
2917             im->step =  atoi(optarg);
2918             break;
2919         case 'N':
2920             im->gridfit = 0;
2921             break;
2922         case 's':
2923             if ((parsetime_error = parsetime(optarg, &start_tv))) {
2924                 rrd_set_error( "start time: %s", parsetime_error );
2925                 return;
2926             }
2927             break;
2928         case 'e':
2929             if ((parsetime_error = parsetime(optarg, &end_tv))) {
2930                 rrd_set_error( "end time: %s", parsetime_error );
2931                 return;
2932             }
2933             break;
2934         case 'x':
2935             if(strcmp(optarg,"none") == 0){
2936               im->draw_x_grid=0;
2937               break;
2938             };
2939
2940             if(sscanf(optarg,
2941                       "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
2942                       scan_gtm,
2943                       &im->xlab_user.gridst,
2944                       scan_mtm,
2945                       &im->xlab_user.mgridst,
2946                       scan_ltm,
2947                       &im->xlab_user.labst,
2948                       &im->xlab_user.precis,
2949                       &stroff) == 7 && stroff != 0){
2950                 strncpy(im->xlab_form, optarg+stroff, sizeof(im->xlab_form) - 1);
2951                 im->xlab_form[sizeof(im->xlab_form)-1] = '\0';
2952                 if((int)(im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1){
2953                     rrd_set_error("unknown keyword %s",scan_gtm);
2954                     return;
2955                 } else if ((int)(im->xlab_user.mgridtm = tmt_conv(scan_mtm)) == -1){
2956                     rrd_set_error("unknown keyword %s",scan_mtm);
2957                     return;
2958                 } else if ((int)(im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1){
2959                     rrd_set_error("unknown keyword %s",scan_ltm);
2960                     return;
2961                 }
2962                 im->xlab_user.minsec = 1;
2963                 im->xlab_user.stst = im->xlab_form;
2964             } else {
2965                 rrd_set_error("invalid x-grid format");
2966                 return;
2967             }
2968             break;
2969         case 'y':
2970
2971             if(strcmp(optarg,"none") == 0){
2972               im->draw_y_grid=0;
2973               break;
2974             };
2975
2976             if(sscanf(optarg,
2977                       "%lf:%d",
2978                       &im->ygridstep,
2979                       &im->ylabfact) == 2) {
2980                 if(im->ygridstep<=0){
2981                     rrd_set_error("grid step must be > 0");
2982                     return;
2983                 } else if (im->ylabfact < 1){
2984                     rrd_set_error("label factor must be > 0");
2985                     return;
2986                 }
2987             } else {
2988                 rrd_set_error("invalid y-grid format");
2989                 return;
2990             }
2991             break;
2992         case 'v':
2993             strncpy(im->ylegend,optarg,150);
2994             im->ylegend[150]='\0';
2995             break;
2996         case 'u':
2997             im->maxval = atof(optarg);
2998             break;
2999         case 'l':
3000             im->minval = atof(optarg);
3001             break;
3002         case 'b':
3003             im->base = atol(optarg);
3004             if(im->base != 1024 && im->base != 1000 ){
3005                 rrd_set_error("the only sensible value for base apart from 1000 is 1024");
3006                 return;
3007             }
3008             break;
3009         case 'w':
3010             long_tmp = atol(optarg);
3011             if (long_tmp < 10) {
3012                 rrd_set_error("width below 10 pixels");
3013                 return;
3014             }
3015             im->xsize = long_tmp;
3016             break;
3017         case 'h':
3018             long_tmp = atol(optarg);
3019             if (long_tmp < 10) {
3020                 rrd_set_error("height below 10 pixels");
3021                 return;
3022             }
3023             im->ysize = long_tmp;
3024             break;
3025         case 'i':
3026             im->canvas->interlaced = 1;
3027             break;
3028         case 'r':
3029             im->rigid = 1;
3030             break;
3031         case 'f':
3032             im->imginfo = optarg;
3033             break;
3034         case 'a':
3035             if((int)(im->canvas->imgformat = if_conv(optarg)) == -1) {
3036                 rrd_set_error("unsupported graphics format '%s'",optarg);
3037                 return;
3038             }
3039             break;
3040         case 'z':
3041             im->lazy = 1;
3042             break;
3043         case 'o':
3044             im->logarithmic = 1;
3045             if (isnan(im->minval))
3046                 im->minval=1;
3047             break;
3048         case 'c':
3049             if(sscanf(optarg,
3050                       "%10[A-Z]#%n%8lx%n",
3051                       col_nam,&col_start,&color,&col_end) == 2){
3052                 int ci;
3053                 int col_len = col_end - col_start;
3054                 switch (col_len){
3055                         case 6:
3056                                 color = (color << 8) + 0xff /* shift left by 8 */;
3057                                 break;
3058                         case 8:
3059                                 break;
3060                         default:
3061                                 rrd_set_error("the color format is #RRGGBB[AA]");
3062                                 return;
3063                 }
3064                 if((ci=grc_conv(col_nam)) != -1){
3065                     im->graph_col[ci]=color;
3066                 }  else {
3067                   rrd_set_error("invalid color name '%s'",col_nam);
3068                   return;
3069                 }
3070             } else {
3071                 rrd_set_error("invalid color def format");
3072                 return;
3073             }
3074             break;
3075         case 'n':{
3076             char prop[15];
3077             double size = 1;
3078             char font[1024];
3079
3080             if(sscanf(optarg,
3081                                 "%10[A-Z]:%lf:%1000s",
3082                                 prop,&size,font) == 3){
3083                 int sindex;
3084                 if((sindex=text_prop_conv(prop)) != -1){
3085                     im->text_prop[sindex].size=size;
3086                     strcpy(im->text_prop[sindex].font,font);
3087                     if (sindex==0) { /* the default */
3088                         im->text_prop[TEXT_PROP_TITLE].size=size;
3089                         strcpy(im->text_prop[TEXT_PROP_TITLE].font,font);
3090                         im->text_prop[TEXT_PROP_AXIS].size=size;
3091                         strcpy(im->text_prop[TEXT_PROP_AXIS].font,font);
3092                         im->text_prop[TEXT_PROP_UNIT].size=size;
3093                         strcpy(im->text_prop[TEXT_PROP_UNIT].font,font);
3094                         im->text_prop[TEXT_PROP_LEGEND].size=size;
3095                         strcpy(im->text_prop[TEXT_PROP_LEGEND].font,font);
3096                     }
3097                 } else {
3098                     rrd_set_error("invalid fonttag '%s'",prop);
3099                     return;
3100                 }
3101             } else {
3102                 rrd_set_error("invalid text property format");
3103                 return;
3104             }
3105             break;
3106         }
3107         case 'm':
3108             im->canvas->zoom = atof(optarg);
3109             if (im->canvas->zoom <= 0.0) {
3110                 rrd_set_error("zoom factor must be > 0");
3111                 return;
3112             }
3113           break;
3114         case 't':
3115             strncpy(im->title,optarg,150);
3116             im->title[150]='\0';
3117             break;
3118
3119         case '?':
3120             if (optopt != 0)
3121                 rrd_set_error("unknown option '%c'", optopt);
3122             else
3123                 rrd_set_error("unknown option '%s'",argv[optind-1]);
3124             return;
3125         }
3126     }
3127
3128     if (optind >= argc) {
3129        rrd_set_error("missing filename");
3130        return;
3131     }
3132
3133     if (im->logarithmic == 1 && (im->minval <= 0 || isnan(im->minval))){
3134         rrd_set_error("for a logarithmic yaxis you must specify a lower-limit > 0");
3135         return;
3136     }
3137
3138     if (proc_start_end(&start_tv,&end_tv,&start_tmp,&end_tmp) == -1){
3139         /* error string is set in parsetime.c */
3140         return;
3141     }
3142
3143     if (start_tmp < 3600*24*365*10){
3144         rrd_set_error("the first entry to fetch should be after 1980 (%ld)",start_tmp);
3145         return;
3146     }
3147
3148     if (end_tmp < start_tmp) {
3149         rrd_set_error("start (%ld) should be less than end (%ld)",
3150                start_tmp, end_tmp);
3151         return;
3152     }
3153
3154     im->start = start_tmp;
3155     im->end = end_tmp;
3156     im->step = max((long)im->step, (im->end-im->start)/im->xsize);
3157 }
3158
3159 int
3160 rrd_graph_check_vname(image_desc_t *im, char *varname, char *err)
3161 {
3162     if ((im->gdes[im->gdes_c-1].vidx=find_var(im,varname))==-1) {
3163         rrd_set_error("Unknown variable '%s' in %s",varname,err);
3164         return -1;
3165     }
3166     return 0;
3167 }
3168 int
3169 rrd_graph_color(image_desc_t *im, char *var, char *err, int optional)
3170 {
3171     char *color;
3172     graph_desc_t *gdp=&im->gdes[im->gdes_c-1];
3173
3174     color=strstr(var,"#");
3175     if (color==NULL) {
3176         if (optional==0) {
3177             rrd_set_error("Found no color in %s",err);
3178             return 0;
3179         }
3180         return 0;
3181     } else {
3182         int n=0;
3183         char *rest;
3184         gfx_color_t    col;
3185
3186         rest=strstr(color,":");
3187         if (rest!=NULL)
3188             n=rest-color;
3189         else
3190             n=strlen(color);
3191
3192         switch (n) {
3193             case 7:
3194                 sscanf(color,"#%6lx%n",&col,&n);
3195                 col = (col << 8) + 0xff /* shift left by 8 */;
3196                 if (n!=7) rrd_set_error("Color problem in %s",err);
3197                 break;
3198             case 9:
3199                 sscanf(color,"#%8lx%n",&col,&n);
3200                 if (n==9) break;
3201             default:
3202                 rrd_set_error("Color problem in %s",err);
3203         }
3204         if (rrd_test_error()) return 0;
3205         gdp->col = col;
3206         return n;
3207     }
3208 }
3209
3210
3211 int bad_format(char *fmt) {
3212     char *ptr;
3213     int n=0;
3214     ptr = fmt;
3215     while (*ptr != '\0')
3216         if (*ptr++ == '%') {
3217
3218              /* line cannot end with percent char */
3219              if (*ptr == '\0') return 1;
3220
3221              /* '%s', '%S' and '%%' are allowed */
3222              if (*ptr == 's' || *ptr == 'S' || *ptr == '%') ptr++;
3223
3224              /* or else '% 6.2lf' and such are allowed */
3225              else {
3226
3227                  /* optional padding character */
3228                  if (*ptr == ' ' || *ptr == '+' || *ptr == '-') ptr++;
3229
3230                  /* This should take care of 'm.n' with all three optional */
3231                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3232                  if (*ptr == '.') ptr++;
3233                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3234
3235                  /* Either 'le', 'lf' or 'lg' must follow here */
3236                  if (*ptr++ != 'l') return 1;
3237                  if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g') ptr++;
3238                  else return 1;
3239                  n++;
3240             }
3241          }
3242
3243       return (n!=1);
3244 }
3245
3246
3247 int
3248 vdef_parse(gdes,str)
3249 struct graph_desc_t *gdes;
3250 char *str;
3251 {
3252     /* A VDEF currently is either "func" or "param,func"
3253      * so the parsing is rather simple.  Change if needed.
3254      */
3255     double      param;
3256     char        func[30];
3257     int         n;
3258
3259     n=0;
3260     sscanf(str,"%le,%29[A-Z]%n",&param,func,&n);
3261     if (n== (int)strlen(str)) { /* matched */
3262         ;
3263     } else {
3264         n=0;
3265         sscanf(str,"%29[A-Z]%n",func,&n);
3266         if (n== (int)strlen(str)) { /* matched */
3267             param=DNAN;
3268         } else {
3269             rrd_set_error("Unknown function string '%s' in VDEF '%s'"
3270                 ,str
3271                 ,gdes->vname
3272                 );
3273             return -1;
3274         }
3275     }
3276     if          (!strcmp("PERCENT",func)) gdes->vf.op = VDEF_PERCENT;
3277     else if     (!strcmp("MAXIMUM",func)) gdes->vf.op = VDEF_MAXIMUM;
3278     else if     (!strcmp("AVERAGE",func)) gdes->vf.op = VDEF_AVERAGE;
3279     else if     (!strcmp("MINIMUM",func)) gdes->vf.op = VDEF_MINIMUM;
3280     else if     (!strcmp("TOTAL",  func)) gdes->vf.op = VDEF_TOTAL;
3281     else if     (!strcmp("FIRST",  func)) gdes->vf.op = VDEF_FIRST;
3282     else if     (!strcmp("LAST",   func)) gdes->vf.op = VDEF_LAST;
3283     else {
3284         rrd_set_error("Unknown function '%s' in VDEF '%s'\n"
3285             ,func
3286             ,gdes->vname
3287             );
3288         return -1;
3289     };
3290
3291     switch (gdes->vf.op) {
3292         case VDEF_PERCENT:
3293             if (isnan(param)) { /* no parameter given */
3294                 rrd_set_error("Function '%s' needs parameter in VDEF '%s'\n"
3295                     ,func
3296                     ,gdes->vname
3297                     );
3298                 return -1;
3299             };
3300             if (param>=0.0 && param<=100.0) {
3301                 gdes->vf.param = param;
3302                 gdes->vf.val   = DNAN;  /* undefined */
3303                 gdes->vf.when  = 0;     /* undefined */
3304             } else {
3305                 rrd_set_error("Parameter '%f' out of range in VDEF '%s'\n"
3306                     ,param
3307                     ,gdes->vname
3308                     );
3309                 return -1;
3310             };
3311             break;
3312         case VDEF_MAXIMUM:
3313         case VDEF_AVERAGE:
3314         case VDEF_MINIMUM:
3315         case VDEF_TOTAL:
3316         case VDEF_FIRST:
3317         case VDEF_LAST:
3318             if (isnan(param)) {
3319                 gdes->vf.param = DNAN;
3320                 gdes->vf.val   = DNAN;
3321                 gdes->vf.when  = 0;
3322             } else {
3323                 rrd_set_error("Function '%s' needs no parameter in VDEF '%s'\n"
3324                     ,func
3325                     ,gdes->vname
3326                     );
3327                 return -1;
3328             };
3329             break;
3330     };
3331     return 0;
3332 }
3333
3334
3335 int
3336 vdef_calc(im,gdi)
3337 image_desc_t *im;
3338 int gdi;
3339 {
3340     graph_desc_t        *src,*dst;
3341     rrd_value_t         *data;
3342     long                step,steps;
3343
3344     dst = &im->gdes[gdi];
3345     src = &im->gdes[dst->vidx];
3346     data = src->data + src->ds;
3347     steps = (src->end - src->start) / src->step;
3348
3349 #if 0
3350 printf("DEBUG: start == %lu, end == %lu, %lu steps\n"
3351     ,src->start
3352     ,src->end
3353     ,steps
3354     );
3355 #endif
3356
3357     switch (dst->vf.op) {
3358         case VDEF_PERCENT: {
3359                 rrd_value_t *   array;
3360                 int             field;
3361
3362
3363                 if ((array = malloc(steps*sizeof(double)))==NULL) {
3364                     rrd_set_error("malloc VDEV_PERCENT");
3365                     return -1;
3366                 }
3367                 for (step=0;step < steps; step++) {
3368                     array[step]=data[step*src->ds_cnt];
3369                 }
3370                 qsort(array,step,sizeof(double),vdef_percent_compar);
3371
3372                 field = (steps-1)*dst->vf.param/100;
3373                 dst->vf.val  = array[field];
3374                 dst->vf.when = 0;       /* no time component */
3375                 free(array);
3376 #if 0
3377 for(step=0;step<steps;step++)
3378 printf("DEBUG: %3li:%10.2f %c\n",step,array[step],step==field?'*':' ');
3379 #endif
3380             }
3381             break;
3382         case VDEF_MAXIMUM:
3383             step=0;
3384             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3385             if (step == steps) {
3386                 dst->vf.val  = DNAN;
3387                 dst->vf.when = 0;
3388             } else {
3389                 dst->vf.val  = data[step*src->ds_cnt];
3390                 dst->vf.when = src->start + (step+1)*src->step;
3391             }
3392             while (step != steps) {
3393                 if (finite(data[step*src->ds_cnt])) {
3394                     if (data[step*src->ds_cnt] > dst->vf.val) {
3395                         dst->vf.val  = data[step*src->ds_cnt];
3396                         dst->vf.when = src->start + (step+1)*src->step;
3397                     }
3398                 }
3399                 step++;
3400             }
3401             break;
3402         case VDEF_TOTAL:
3403         case VDEF_AVERAGE: {
3404             int cnt=0;
3405             double sum=0.0;
3406             for (step=0;step<steps;step++) {
3407                 if (finite(data[step*src->ds_cnt])) {
3408                     sum += data[step*src->ds_cnt];
3409                     cnt ++;
3410                 };
3411             }
3412             if (cnt) {
3413                 if (dst->vf.op == VDEF_TOTAL) {
3414                     dst->vf.val  = sum*src->step;
3415                     dst->vf.when = cnt*src->step;       /* not really "when" */
3416                 } else {
3417                     dst->vf.val = sum/cnt;
3418                     dst->vf.when = 0;   /* no time component */
3419                 };
3420             } else {
3421                 dst->vf.val  = DNAN;
3422                 dst->vf.when = 0;
3423             }
3424             }
3425             break;
3426         case VDEF_MINIMUM:
3427             step=0;
3428             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3429             if (step == steps) {
3430                 dst->vf.val  = DNAN;
3431                 dst->vf.when = 0;
3432             } else {
3433                 dst->vf.val  = data[step*src->ds_cnt];
3434                 dst->vf.when = src->start + (step+1)*src->step;
3435             }
3436             while (step != steps) {
3437                 if (finite(data[step*src->ds_cnt])) {
3438                     if (data[step*src->ds_cnt] < dst->vf.val) {
3439                         dst->vf.val  = data[step*src->ds_cnt];
3440                         dst->vf.when = src->start + (step+1)*src->step;
3441                     }
3442                 }
3443                 step++;
3444             }
3445             break;
3446         case VDEF_FIRST:
3447             /* The time value returned here is one step before the
3448              * actual time value.  This is the start of the first
3449              * non-NaN interval.
3450              */
3451             step=0;
3452             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3453             if (step == steps) { /* all entries were NaN */
3454                 dst->vf.val  = DNAN;
3455                 dst->vf.when = 0;
3456             } else {
3457                 dst->vf.val  = data[step*src->ds_cnt];
3458                 dst->vf.when = src->start + step*src->step;
3459             }
3460             break;
3461         case VDEF_LAST:
3462             /* The time value returned here is the
3463              * actual time value.  This is the end of the last
3464              * non-NaN interval.
3465              */
3466             step=steps-1;
3467             while (step >= 0 && isnan(data[step*src->ds_cnt])) step--;
3468             if (step < 0) { /* all entries were NaN */
3469                 dst->vf.val  = DNAN;
3470                 dst->vf.when = 0;
3471             } else {
3472                 dst->vf.val  = data[step*src->ds_cnt];
3473                 dst->vf.when = src->start + (step+1)*src->step;
3474             }
3475             break;
3476     }
3477     return 0;
3478 }
3479
3480 /* NaN < -INF < finite_values < INF */
3481 int
3482 vdef_percent_compar(a,b)
3483 const void *a,*b;
3484 {
3485     /* Equality is not returned; this doesn't hurt except
3486      * (maybe) for a little performance.
3487      */
3488
3489     /* First catch NaN values. They are smallest */
3490     if (isnan( *(double *)a )) return -1;
3491     if (isnan( *(double *)b )) return  1;
3492
3493     /* NaN doesn't reach this part so INF and -INF are extremes.
3494      * The sign from isinf() is compatible with the sign we return
3495      */
3496     if (isinf( *(double *)a )) return isinf( *(double *)a );
3497     if (isinf( *(double *)b )) return isinf( *(double *)b );
3498
3499     /* If we reach this, both values must be finite */
3500     if ( *(double *)a < *(double *)b ) return -1; else return 1;
3501 }