src/rrd_graph.c

   1 /****************************************************************************
   2  * RRDtool 1.2.1  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 "DejaVuSansMono-Roman.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                   12, (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*1.3+4,
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,
2121                         Ytitle   =0,
2122         Xylabel  =0,
2123         Xmain    =0,    Ymain    =0,
2124 #ifdef WITH_PIECHART
2125         Xpie     =0,    Ypie     =0,
2126 #endif
2127                         Yxlabel  =0,
2128 #if 0
2129         Xlegend  =0,    Ylegend  =0,
2130 #endif
2131         Xspacing =15,  Yspacing =15;
2132
2133     if (im->extra_flags & ONLY_GRAPH) {
2134         im->xorigin =0;
2135         im->ximg = im->xsize;
2136         im->yimg = im->ysize;
2137         im->yorigin = im->ysize;
2138         return 0;
2139     }
2140
2141     if (im->ylegend[0] != '\0' ) {
2142            Xvertical = im->text_prop[TEXT_PROP_UNIT].size *2;
2143     }
2144
2145
2146     if (im->title[0] != '\0') {
2147         /* The title is placed "inbetween" two text lines so it
2148         ** automatically has some vertical spacing.  The horizontal
2149         ** spacing is added here, on each side.
2150         */
2151         /* don't care for the with of the title
2152                 Xtitle = gfx_get_text_width(im->canvas, 0,
2153                 im->text_prop[TEXT_PROP_TITLE].font,
2154                 im->text_prop[TEXT_PROP_TITLE].size,
2155                 im->tabwidth,
2156                 im->title, 0) + 2*Xspacing; */
2157         Ytitle = im->text_prop[TEXT_PROP_TITLE].size*2.6+10;
2158     }
2159
2160     if (elements) {
2161         Xmain=im->xsize;
2162         Ymain=im->ysize;
2163         if (im->draw_x_grid) {
2164             Yxlabel=im->text_prop[TEXT_PROP_AXIS].size *2.5;
2165         }
2166         if (im->draw_y_grid) {
2167             Xylabel=gfx_get_text_width(im->canvas, 0,
2168                         im->text_prop[TEXT_PROP_AXIS].font,
2169                         im->text_prop[TEXT_PROP_AXIS].size,
2170                         im->tabwidth,
2171                         "0", 0) * im->unitslength + Xspacing;
2172         }
2173     }
2174
2175 #ifdef WITH_PIECHART
2176     if (piechart) {
2177         im->piesize=im->xsize<im->ysize?im->xsize:im->ysize;
2178         Xpie=im->piesize;
2179         Ypie=im->piesize;
2180     }
2181 #endif
2182
2183     /* Now calculate the total size.  Insert some spacing where
2184        desired.  im->xorigin and im->yorigin need to correspond
2185        with the lower left corner of the main graph area or, if
2186        this one is not set, the imaginary box surrounding the
2187        pie chart area. */
2188
2189     /* The legend width cannot yet be determined, as a result we
2190     ** have problems adjusting the image to it.  For now, we just
2191     ** forget about it at all; the legend will have to fit in the
2192     ** size already allocated.
2193     */
2194     im->ximg = Xylabel + Xmain + 2 * Xspacing;
2195
2196 #ifdef WITH_PIECHART
2197     im->ximg  += Xpie;
2198 #endif
2199
2200     if (Xmain) im->ximg += Xspacing;
2201 #ifdef WITH_PIECHART
2202     if (Xpie) im->ximg += Xspacing;
2203 #endif
2204
2205     im->xorigin = Xspacing + Xylabel;
2206
2207     /* the length of the title should not influence with width of the graph
2208        if (Xtitle > im->ximg) im->ximg = Xtitle; */
2209
2210     if (Xvertical) { /* unit description */
2211         im->ximg += Xvertical;
2212         im->xorigin += Xvertical;
2213     }
2214     xtr(im,0);
2215
2216     /* The vertical size is interesting... we need to compare
2217     ** the sum of {Ytitle, Ymain, Yxlabel, Ylegend} with Yvertical
2218     ** however we need to know {Ytitle+Ymain+Yxlabel} in order to
2219     ** start even thinking about Ylegend.
2220     **
2221     ** Do it in three portions: First calculate the inner part,
2222     ** then do the legend, then adjust the total height of the img.
2223     */
2224
2225     /* reserve space for main and/or pie */
2226
2227     im->yimg = Ymain + Yxlabel;
2228
2229 #ifdef WITH_PIECHART
2230     if (im->yimg < Ypie) im->yimg = Ypie;
2231 #endif
2232
2233     im->yorigin = im->yimg - Yxlabel;
2234
2235     /* reserve space for the title *or* some padding above the graph */
2236     if (Ytitle) {
2237         im->yimg += Ytitle;
2238         im->yorigin += Ytitle;
2239     } else {
2240         im->yimg += 1.5*Yspacing;
2241         im->yorigin += 1.5*Yspacing;
2242     }
2243     /* reserve space for padding below the graph */
2244     im->yimg += Yspacing;
2245     ytr(im,DNAN);
2246
2247     /* Determine where to place the legends onto the image.
2248     ** Adjust im->yimg to match the space requirements.
2249     */
2250     if(leg_place(im)==-1)
2251         return -1;
2252
2253
2254 #if 0
2255     if (Xlegend > im->ximg) {
2256         im->ximg = Xlegend;
2257         /* reposition Pie */
2258     }
2259 #endif
2260
2261 #ifdef WITH_PIECHART
2262     /* The pie is placed in the upper right hand corner,
2263     ** just below the title (if any) and with sufficient
2264     ** padding.
2265     */
2266     if (elements) {
2267         im->pie_x = im->ximg - Xspacing - Xpie/2;
2268         im->pie_y = im->yorigin-Ymain+Ypie/2;
2269     } else {
2270         im->pie_x = im->ximg/2;
2271         im->pie_y = im->yorigin-Ypie/2;
2272     }
2273 #endif
2274
2275     return 0;
2276 }
2277
2278 /* draw that picture thing ... */
2279 int
2280 graph_paint(image_desc_t *im, char ***calcpr)
2281 {
2282   int i,ii;
2283   int lazy =     lazy_check(im);
2284 #ifdef WITH_PIECHART
2285   int piechart = 0;
2286   double PieStart=0.0;
2287 #endif
2288   FILE  *fo;
2289   gfx_node_t *node;
2290
2291   double areazero = 0.0;
2292   enum gf_en stack_gf = GF_PRINT;
2293   graph_desc_t *lastgdes = NULL;
2294
2295   /* if we are lazy and there is nothing to PRINT ... quit now */
2296   if (lazy && im->prt_c==0) return 0;
2297
2298   /* pull the data from the rrd files ... */
2299
2300   if(data_fetch(im)==-1)
2301     return -1;
2302
2303   /* evaluate VDEF and CDEF operations ... */
2304   if(data_calc(im)==-1)
2305     return -1;
2306
2307 #ifdef WITH_PIECHART
2308   /* check if we need to draw a piechart */
2309   for(i=0;i<im->gdes_c;i++){
2310     if (im->gdes[i].gf == GF_PART) {
2311       piechart=1;
2312       break;
2313     }
2314   }
2315 #endif
2316
2317   /* calculate and PRINT and GPRINT definitions. We have to do it at
2318    * this point because it will affect the length of the legends
2319    * if there are no graph elements we stop here ...
2320    * if we are lazy, try to quit ...
2321    */
2322   i=print_calc(im,calcpr);
2323   if(i<0) return -1;
2324   if(((i==0)
2325 #ifdef WITH_PIECHART
2326 &&(piechart==0)
2327 #endif
2328 ) || lazy) return 0;
2329
2330 #ifdef WITH_PIECHART
2331   /* If there's only the pie chart to draw, signal this */
2332   if (i==0) piechart=2;
2333 #endif
2334
2335   /* get actual drawing data and find min and max values*/
2336   if(data_proc(im)==-1)
2337     return -1;
2338
2339   if(!im->logarithmic){si_unit(im);}        /* identify si magnitude Kilo, Mega Giga ? */
2340
2341   if(!im->rigid && ! im->logarithmic)
2342     expand_range(im);   /* make sure the upper and lower limit are
2343                            sensible values */
2344
2345   if (!calc_horizontal_grid(im))
2346     return -1;
2347
2348   if (im->gridfit)
2349     apply_gridfit(im);
2350
2351
2352 /**************************************************************
2353  *** Calculating sizes and locations became a bit confusing ***
2354  *** so I moved this into a separate function.              ***
2355  **************************************************************/
2356   if(graph_size_location(im,i
2357 #ifdef WITH_PIECHART
2358 ,piechart
2359 #endif
2360 )==-1)
2361     return -1;
2362
2363   /* the actual graph is created by going through the individual
2364      graph elements and then drawing them */
2365
2366   node=gfx_new_area ( im->canvas,
2367                       0, 0,
2368                       im->ximg, 0,
2369                       im->ximg, im->yimg,
2370                       im->graph_col[GRC_BACK]);
2371
2372   gfx_add_point(node,0, im->yimg);
2373
2374 #ifdef WITH_PIECHART
2375   if (piechart != 2) {
2376 #endif
2377     node=gfx_new_area ( im->canvas,
2378                       im->xorigin,             im->yorigin,
2379                       im->xorigin + im->xsize, im->yorigin,
2380                       im->xorigin + im->xsize, im->yorigin-im->ysize,
2381                       im->graph_col[GRC_CANVAS]);
2382
2383     gfx_add_point(node,im->xorigin, im->yorigin - im->ysize);
2384
2385     if (im->minval > 0.0)
2386       areazero = im->minval;
2387     if (im->maxval < 0.0)
2388       areazero = im->maxval;
2389 #ifdef WITH_PIECHART
2390    }
2391 #endif
2392
2393 #ifdef WITH_PIECHART
2394   if (piechart) {
2395     pie_part(im,im->graph_col[GRC_CANVAS],im->pie_x,im->pie_y,im->piesize*0.5,0,2*M_PI);
2396   }
2397 #endif
2398
2399   for(i=0;i<im->gdes_c;i++){
2400     switch(im->gdes[i].gf){
2401     case GF_CDEF:
2402     case GF_VDEF:
2403     case GF_DEF:
2404     case GF_PRINT:
2405     case GF_GPRINT:
2406     case GF_COMMENT:
2407     case GF_HRULE:
2408     case GF_VRULE:
2409     case GF_XPORT:
2410     case GF_SHIFT:
2411       break;
2412     case GF_TICK:
2413       for (ii = 0; ii < im->xsize; ii++)
2414         {
2415           if (!isnan(im->gdes[i].p_data[ii]) &&
2416               im->gdes[i].p_data[ii] > 0.0)
2417             {
2418               /* generate a tick */
2419               gfx_new_line(im->canvas, im -> xorigin + ii,
2420                            im -> yorigin - (im -> gdes[i].yrule * im -> ysize),
2421                            im -> xorigin + ii,
2422                            im -> yorigin,
2423                            1.0,
2424                            im -> gdes[i].col );
2425             }
2426         }
2427       break;
2428     case GF_LINE:
2429     case GF_AREA:
2430       stack_gf = im->gdes[i].gf;
2431     case GF_STACK:
2432       /* fix data points at oo and -oo */
2433       for(ii=0;ii<im->xsize;ii++){
2434         if (isinf(im->gdes[i].p_data[ii])){
2435           if (im->gdes[i].p_data[ii] > 0) {
2436             im->gdes[i].p_data[ii] = im->maxval ;
2437           } else {
2438             im->gdes[i].p_data[ii] = im->minval ;
2439           }
2440
2441         }
2442       } /* for */
2443
2444       /* *******************************************************
2445                    ___
2446                   |   |    ___
2447               ____|   |   |   |
2448               |       |___|
2449        -------|---------------------------------------
2450
2451       if we know the value of y at time t was a then
2452       we draw a square from t-1 to t with the value a.
2453
2454       ********************************************************* */
2455       if (im->gdes[i].col != 0x0){
2456         /* GF_LINE and friend */
2457         if(stack_gf == GF_LINE ){
2458           node = NULL;
2459           for(ii=1;ii<im->xsize;ii++){
2460             if (isnan(im->gdes[i].p_data[ii])){
2461                 node = NULL;
2462                 continue;
2463             }
2464             if ( node == NULL ) {
2465                  node = gfx_new_line(im->canvas,
2466                                     ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2467                                     ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2468                                     im->gdes[i].linewidth,
2469                                     im->gdes[i].col);
2470              } else {
2471                gfx_add_point(node,ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2472                gfx_add_point(node,ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2473              };
2474
2475           }
2476         } else {
2477           for(ii=1;ii<im->xsize;ii++){
2478             /* keep things simple for now, just draw these bars
2479                do not try to build a big and complex area */
2480             float ybase,ytop;
2481             if ( isnan(im->gdes[i].p_data[ii]) ) {
2482                 continue;
2483             }
2484             ytop = ytr(im,im->gdes[i].p_data[ii]);
2485             if ( lastgdes && im->gdes[i].stack ) {
2486                   ybase = ytr(im,lastgdes->p_data[ii]);
2487             } else {
2488                   ybase = ytr(im,areazero);
2489             }
2490             if ( ybase == ytop ){
2491                 continue;
2492             }
2493             node = gfx_new_area(im->canvas,
2494                                 ii-1+im->xorigin,ybase,
2495                                 ii-1+im->xorigin,ytop,
2496                                 ii+im->xorigin,ytop,
2497                                 im->gdes[i].col
2498                                );
2499             gfx_add_point(node,ii+im->xorigin,ybase);
2500           }
2501         } /* else GF_LINE */
2502       } /* if color != 0x0 */
2503       /* make sure we do not run into trouble when stacking on NaN */
2504       for(ii=0;ii<im->xsize;ii++){
2505         if (isnan(im->gdes[i].p_data[ii])) {
2506           if (lastgdes && (im->gdes[i].stack)) {
2507             im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
2508           } else {
2509             im->gdes[i].p_data[ii] =  ytr(im,areazero);
2510           }
2511         }
2512       }
2513       lastgdes = &(im->gdes[i]);
2514       break;
2515 #ifdef WITH_PIECHART
2516     case GF_PART:
2517       if(isnan(im->gdes[i].yrule)) /* fetch variable */
2518         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2519
2520       if (finite(im->gdes[i].yrule)) {  /* even the fetched var can be NaN */
2521         pie_part(im,im->gdes[i].col,
2522                 im->pie_x,im->pie_y,im->piesize*0.4,
2523                 M_PI*2.0*PieStart/100.0,
2524                 M_PI*2.0*(PieStart+im->gdes[i].yrule)/100.0);
2525         PieStart += im->gdes[i].yrule;
2526       }
2527       break;
2528 #endif
2529
2530     } /* switch */
2531   }
2532 #ifdef WITH_PIECHART
2533   if (piechart==2) {
2534     im->draw_x_grid=0;
2535     im->draw_y_grid=0;
2536   }
2537 #endif
2538
2539
2540   /* grid_paint also does the text */
2541   if( !(im->extra_flags & ONLY_GRAPH) )
2542     grid_paint(im);
2543
2544
2545   if( !(im->extra_flags & ONLY_GRAPH) )
2546       axis_paint(im);
2547
2548   /* the RULES are the last thing to paint ... */
2549   for(i=0;i<im->gdes_c;i++){
2550
2551     switch(im->gdes[i].gf){
2552     case GF_HRULE:
2553       if(isnan(im->gdes[i].yrule)) { /* fetch variable */
2554         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2555       };
2556       if(im->gdes[i].yrule >= im->minval
2557          && im->gdes[i].yrule <= im->maxval)
2558         gfx_new_line(im->canvas,
2559                      im->xorigin,ytr(im,im->gdes[i].yrule),
2560                      im->xorigin+im->xsize,ytr(im,im->gdes[i].yrule),
2561                      1.0,im->gdes[i].col);
2562       break;
2563     case GF_VRULE:
2564       if(im->gdes[i].xrule == 0) { /* fetch variable */
2565         im->gdes[i].xrule = im->gdes[im->gdes[i].vidx].vf.when;
2566       };
2567       if(im->gdes[i].xrule >= im->start
2568          && im->gdes[i].xrule <= im->end)
2569         gfx_new_line(im->canvas,
2570                      xtr(im,im->gdes[i].xrule),im->yorigin,
2571                      xtr(im,im->gdes[i].xrule),im->yorigin-im->ysize,
2572                      1.0,im->gdes[i].col);
2573       break;
2574     default:
2575       break;
2576     }
2577   }
2578
2579
2580   if (strcmp(im->graphfile,"-")==0) {
2581     fo = im->graphhandle ? im->graphhandle : stdout;
2582 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2583     /* Change translation mode for stdout to BINARY */
2584     _setmode( _fileno( fo ), O_BINARY );
2585 #endif
2586   } else {
2587     if ((fo = fopen(im->graphfile,"wb")) == NULL) {
2588       rrd_set_error("Opening '%s' for write: %s",im->graphfile,
2589                     rrd_strerror(errno));
2590       return (-1);
2591     }
2592   }
2593   gfx_render (im->canvas,im->ximg,im->yimg,0x0,fo);
2594   if (strcmp(im->graphfile,"-") != 0)
2595     fclose(fo);
2596   return 0;
2597 }
2598
2599
2600 /*****************************************************
2601  * graph stuff
2602  *****************************************************/
2603
2604 int
2605 gdes_alloc(image_desc_t *im){
2606
2607     im->gdes_c++;
2608     if ((im->gdes = (graph_desc_t *) rrd_realloc(im->gdes, (im->gdes_c)
2609                                            * sizeof(graph_desc_t)))==NULL){
2610         rrd_set_error("realloc graph_descs");
2611         return -1;
2612     }
2613
2614
2615     im->gdes[im->gdes_c-1].step=im->step;
2616     im->gdes[im->gdes_c-1].stack=0;
2617     im->gdes[im->gdes_c-1].debug=0;
2618     im->gdes[im->gdes_c-1].start=im->start;
2619     im->gdes[im->gdes_c-1].end=im->end;
2620     im->gdes[im->gdes_c-1].vname[0]='\0';
2621     im->gdes[im->gdes_c-1].data=NULL;
2622     im->gdes[im->gdes_c-1].ds_namv=NULL;
2623     im->gdes[im->gdes_c-1].data_first=0;
2624     im->gdes[im->gdes_c-1].p_data=NULL;
2625     im->gdes[im->gdes_c-1].rpnp=NULL;
2626     im->gdes[im->gdes_c-1].shift=0;
2627     im->gdes[im->gdes_c-1].col = 0x0;
2628     im->gdes[im->gdes_c-1].legend[0]='\0';
2629     im->gdes[im->gdes_c-1].format[0]='\0';
2630     im->gdes[im->gdes_c-1].rrd[0]='\0';
2631     im->gdes[im->gdes_c-1].ds=-1;
2632     im->gdes[im->gdes_c-1].p_data=NULL;
2633     im->gdes[im->gdes_c-1].yrule=DNAN;
2634     im->gdes[im->gdes_c-1].xrule=0;
2635     return 0;
2636 }
2637
2638 /* copies input untill the first unescaped colon is found
2639    or until input ends. backslashes have to be escaped as well */
2640 int
2641 scan_for_col(char *input, int len, char *output)
2642 {
2643     int inp,outp=0;
2644     for (inp=0;
2645          inp < len &&
2646            input[inp] != ':' &&
2647            input[inp] != '\0';
2648          inp++){
2649       if (input[inp] == '\\' &&
2650           input[inp+1] != '\0' &&
2651           (input[inp+1] == '\\' ||
2652            input[inp+1] == ':')){
2653         output[outp++] = input[++inp];
2654       }
2655       else {
2656         output[outp++] = input[inp];
2657       }
2658     }
2659     output[outp] = '\0';
2660     return inp;
2661 }
2662 /* Some surgery done on this function, it became ridiculously big.
2663 ** Things moved:
2664 ** - initializing     now in rrd_graph_init()
2665 ** - options parsing  now in rrd_graph_options()
2666 ** - script parsing   now in rrd_graph_script()
2667 */
2668 int
2669 rrd_graph(int argc, char **argv, char ***prdata, int *xsize, int *ysize, FILE *stream, double *ymin, double *ymax)
2670 {
2671     image_desc_t   im;
2672     rrd_graph_init(&im);
2673     im.graphhandle = stream;
2674
2675     rrd_graph_options(argc,argv,&im);
2676     if (rrd_test_error()) {
2677         im_free(&im);
2678         return -1;
2679     }
2680
2681     if (strlen(argv[optind])>=MAXPATH) {
2682         rrd_set_error("filename (including path) too long");
2683         im_free(&im);
2684         return -1;
2685     }
2686     strncpy(im.graphfile,argv[optind],MAXPATH-1);
2687     im.graphfile[MAXPATH-1]='\0';
2688
2689     rrd_graph_script(argc,argv,&im,1);
2690     if (rrd_test_error()) {
2691         im_free(&im);
2692         return -1;
2693     }
2694
2695     /* Everything is now read and the actual work can start */
2696
2697     (*prdata)=NULL;
2698     if (graph_paint(&im,prdata)==-1){
2699         im_free(&im);
2700         return -1;
2701     }
2702
2703     /* The image is generated and needs to be output.
2704     ** Also, if needed, print a line with information about the image.
2705     */
2706
2707     *xsize=im.ximg;
2708     *ysize=im.yimg;
2709     *ymin=im.minval;
2710     *ymax=im.maxval;
2711     if (im.imginfo) {
2712         char *filename;
2713         if (!(*prdata)) {
2714             /* maybe prdata is not allocated yet ... lets do it now */
2715             if ((*prdata = calloc(2,sizeof(char *)))==NULL) {
2716                 rrd_set_error("malloc imginfo");
2717                 return -1;
2718             };
2719         }
2720         if(((*prdata)[0] = malloc((strlen(im.imginfo)+200+strlen(im.graphfile))*sizeof(char)))
2721          ==NULL){
2722             rrd_set_error("malloc imginfo");
2723             return -1;
2724         }
2725         filename=im.graphfile+strlen(im.graphfile);
2726         while(filename > im.graphfile) {
2727             if (*(filename-1)=='/' || *(filename-1)=='\\' ) break;
2728             filename--;
2729         }
2730
2731         sprintf((*prdata)[0],im.imginfo,filename,(long)(im.canvas->zoom*im.ximg),(long)(im.canvas->zoom*im.yimg));
2732     }
2733     im_free(&im);
2734     return 0;
2735 }
2736
2737 void
2738 rrd_graph_init(image_desc_t *im)
2739 {
2740     unsigned int i;
2741
2742 #ifdef HAVE_TZSET
2743     tzset();
2744 #endif
2745 #ifdef HAVE_SETLOCALE
2746     setlocale(LC_TIME,"");
2747 #endif
2748     im->yorigin=0;
2749     im->xorigin=0;
2750     im->minval=0;
2751     im->xlab_user.minsec = -1;
2752     im->ximg=0;
2753     im->yimg=0;
2754     im->xsize = 400;
2755     im->ysize = 100;
2756     im->step = 0;
2757     im->ylegend[0] = '\0';
2758     im->title[0] = '\0';
2759     im->minval = DNAN;
2760     im->maxval = DNAN;
2761     im->unitsexponent= 9999;
2762     im->unitslength= 6;
2763     im->symbol = ' ';
2764     im->viewfactor = 1.0;
2765     im->extra_flags= 0;
2766     im->rigid = 0;
2767     im->gridfit = 1;
2768     im->imginfo = NULL;
2769     im->lazy = 0;
2770     im->logarithmic = 0;
2771     im->ygridstep = DNAN;
2772     im->draw_x_grid = 1;
2773     im->draw_y_grid = 1;
2774     im->base = 1000;
2775     im->prt_c = 0;
2776     im->gdes_c = 0;
2777     im->gdes = NULL;
2778     im->canvas = gfx_new_canvas();
2779     im->grid_dash_on = 1;
2780     im->grid_dash_off = 1;
2781     im->tabwidth = 40.0;
2782
2783     for(i=0;i<DIM(graph_col);i++)
2784         im->graph_col[i]=graph_col[i];
2785
2786 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2787     {
2788             char *windir;
2789             char rrd_win_default_font[1000];
2790             windir = getenv("windir");
2791             /* %windir% is something like D:\windows or C:\winnt */
2792             if (windir != NULL) {
2793                     strncpy(rrd_win_default_font,windir,999);
2794                     rrd_win_default_font[999] = '\0';
2795                     strcat(rrd_win_default_font,"\\fonts\\");
2796                     strcat(rrd_win_default_font,RRD_DEFAULT_FONT);
2797                     for(i=0;i<DIM(text_prop);i++){
2798                             strncpy(text_prop[i].font,rrd_win_default_font,sizeof(text_prop[i].font)-1);
2799                             text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2800                      }
2801              }
2802     }
2803 #endif
2804     {
2805             char *deffont;
2806             deffont = getenv("RRD_DEFAULT_FONT");
2807             if (deffont != NULL) {
2808                  for(i=0;i<DIM(text_prop);i++){
2809                         strncpy(text_prop[i].font,deffont,sizeof(text_prop[i].font)-1);
2810                         text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2811                  }
2812             }
2813     }
2814     for(i=0;i<DIM(text_prop);i++){
2815       im->text_prop[i].size = text_prop[i].size;
2816       strcpy(im->text_prop[i].font,text_prop[i].font);
2817     }
2818 }
2819
2820 void
2821 rrd_graph_options(int argc, char *argv[],image_desc_t *im)
2822 {
2823     int                 stroff;
2824     char                *parsetime_error = NULL;
2825     char                scan_gtm[12],scan_mtm[12],scan_ltm[12],col_nam[12];
2826     time_t              start_tmp=0,end_tmp=0;
2827     long                long_tmp;
2828     struct rrd_time_value       start_tv, end_tv;
2829     gfx_color_t         color;
2830     optind = 0; opterr = 0;  /* initialize getopt */
2831
2832     parsetime("end-24h", &start_tv);
2833     parsetime("now", &end_tv);
2834
2835     while (1){
2836         static struct option long_options[] =
2837         {
2838             {"start",      required_argument, 0,  's'},
2839             {"end",        required_argument, 0,  'e'},
2840             {"x-grid",     required_argument, 0,  'x'},
2841             {"y-grid",     required_argument, 0,  'y'},
2842             {"vertical-label",required_argument,0,'v'},
2843             {"width",      required_argument, 0,  'w'},
2844             {"height",     required_argument, 0,  'h'},
2845             {"interlaced", no_argument,       0,  'i'},
2846             {"upper-limit",required_argument, 0,  'u'},
2847             {"lower-limit",required_argument, 0,  'l'},
2848             {"rigid",      no_argument,       0,  'r'},
2849             {"base",       required_argument, 0,  'b'},
2850             {"logarithmic",no_argument,       0,  'o'},
2851             {"color",      required_argument, 0,  'c'},
2852             {"font",       required_argument, 0,  'n'},
2853             {"title",      required_argument, 0,  't'},
2854             {"imginfo",    required_argument, 0,  'f'},
2855             {"imgformat",  required_argument, 0,  'a'},
2856             {"lazy",       no_argument,       0,  'z'},
2857             {"zoom",       required_argument, 0,  'm'},
2858             {"no-legend",  no_argument,       0,  'g'},
2859             {"force-rules-legend",no_argument,0,  'F'},
2860             {"only-graph", no_argument,       0,  'j'},
2861             {"alt-y-grid", no_argument,       0,  'Y'},
2862             {"no-minor",   no_argument,       0,  'I'},
2863             {"alt-autoscale", no_argument,    0,  'A'},
2864             {"alt-autoscale-max", no_argument, 0, 'M'},
2865             {"no-gridfit", no_argument,       0,   'N'},
2866             {"units-exponent",required_argument, 0, 'X'},
2867             {"units-length",required_argument, 0, 'L'},
2868             {"step",       required_argument, 0,    'S'},
2869             {"tabwidth",   required_argument, 0,    'T'},
2870             {"font-render-mode", required_argument, 0, 'R'},
2871             {"font-smoothing-threshold", required_argument, 0, 'B'},
2872             {0,0,0,0}};
2873         int option_index = 0;
2874         int opt;
2875         int col_start,col_end;
2876
2877         opt = getopt_long(argc, argv,
2878                          "s:e:x:y:v:w:h:iu:l:rb:oc:n:m:t:f:a:I:zgjFYAMX:L:S:T:NR:B:",
2879                           long_options, &option_index);
2880
2881         if (opt == EOF)
2882             break;
2883
2884         switch(opt) {
2885         case 'I':
2886             im->extra_flags |= NOMINOR;
2887             break;
2888         case 'Y':
2889             im->extra_flags |= ALTYGRID;
2890             break;
2891         case 'A':
2892             im->extra_flags |= ALTAUTOSCALE;
2893             break;
2894         case 'M':
2895             im->extra_flags |= ALTAUTOSCALE_MAX;
2896             break;
2897         case 'j':
2898            im->extra_flags |= ONLY_GRAPH;
2899            break;
2900         case 'g':
2901             im->extra_flags |= NOLEGEND;
2902             break;
2903         case 'F':
2904             im->extra_flags |= FORCE_RULES_LEGEND;
2905             break;
2906         case 'X':
2907             im->unitsexponent = atoi(optarg);
2908             break;
2909         case 'L':
2910             im->unitslength = atoi(optarg);
2911             break;
2912         case 'T':
2913             im->tabwidth = atof(optarg);
2914             break;
2915         case 'S':
2916             im->step =  atoi(optarg);
2917             break;
2918         case 'N':
2919             im->gridfit = 0;
2920             break;
2921         case 's':
2922             if ((parsetime_error = parsetime(optarg, &start_tv))) {
2923                 rrd_set_error( "start time: %s", parsetime_error );
2924                 return;
2925             }
2926             break;
2927         case 'e':
2928             if ((parsetime_error = parsetime(optarg, &end_tv))) {
2929                 rrd_set_error( "end time: %s", parsetime_error );
2930                 return;
2931             }
2932             break;
2933         case 'x':
2934             if(strcmp(optarg,"none") == 0){
2935               im->draw_x_grid=0;
2936               break;
2937             };
2938
2939             if(sscanf(optarg,
2940                       "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
2941                       scan_gtm,
2942                       &im->xlab_user.gridst,
2943                       scan_mtm,
2944                       &im->xlab_user.mgridst,
2945                       scan_ltm,
2946                       &im->xlab_user.labst,
2947                       &im->xlab_user.precis,
2948                       &stroff) == 7 && stroff != 0){
2949                 strncpy(im->xlab_form, optarg+stroff, sizeof(im->xlab_form) - 1);
2950                 im->xlab_form[sizeof(im->xlab_form)-1] = '\0';
2951                 if((int)(im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1){
2952                     rrd_set_error("unknown keyword %s",scan_gtm);
2953                     return;
2954                 } else if ((int)(im->xlab_user.mgridtm = tmt_conv(scan_mtm)) == -1){
2955                     rrd_set_error("unknown keyword %s",scan_mtm);
2956                     return;
2957                 } else if ((int)(im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1){
2958                     rrd_set_error("unknown keyword %s",scan_ltm);
2959                     return;
2960                 }
2961                 im->xlab_user.minsec = 1;
2962                 im->xlab_user.stst = im->xlab_form;
2963             } else {
2964                 rrd_set_error("invalid x-grid format");
2965                 return;
2966             }
2967             break;
2968         case 'y':
2969
2970             if(strcmp(optarg,"none") == 0){
2971               im->draw_y_grid=0;
2972               break;
2973             };
2974
2975             if(sscanf(optarg,
2976                       "%lf:%d",
2977                       &im->ygridstep,
2978                       &im->ylabfact) == 2) {
2979                 if(im->ygridstep<=0){
2980                     rrd_set_error("grid step must be > 0");
2981                     return;
2982                 } else if (im->ylabfact < 1){
2983                     rrd_set_error("label factor must be > 0");
2984                     return;
2985                 }
2986             } else {
2987                 rrd_set_error("invalid y-grid format");
2988                 return;
2989             }
2990             break;
2991         case 'v':
2992             strncpy(im->ylegend,optarg,150);
2993             im->ylegend[150]='\0';
2994             break;
2995         case 'u':
2996             im->maxval = atof(optarg);
2997             break;
2998         case 'l':
2999             im->minval = atof(optarg);
3000             break;
3001         case 'b':
3002             im->base = atol(optarg);
3003             if(im->base != 1024 && im->base != 1000 ){
3004                 rrd_set_error("the only sensible value for base apart from 1000 is 1024");
3005                 return;
3006             }
3007             break;
3008         case 'w':
3009             long_tmp = atol(optarg);
3010             if (long_tmp < 10) {
3011                 rrd_set_error("width below 10 pixels");
3012                 return;
3013             }
3014             im->xsize = long_tmp;
3015             break;
3016         case 'h':
3017             long_tmp = atol(optarg);
3018             if (long_tmp < 10) {
3019                 rrd_set_error("height below 10 pixels");
3020                 return;
3021             }
3022             im->ysize = long_tmp;
3023             break;
3024         case 'i':
3025             im->canvas->interlaced = 1;
3026             break;
3027         case 'r':
3028             im->rigid = 1;
3029             break;
3030         case 'f':
3031             im->imginfo = optarg;
3032             break;
3033         case 'a':
3034             if((int)(im->canvas->imgformat = if_conv(optarg)) == -1) {
3035                 rrd_set_error("unsupported graphics format '%s'",optarg);
3036                 return;
3037             }
3038             break;
3039         case 'z':
3040             im->lazy = 1;
3041             break;
3042         case 'o':
3043             im->logarithmic = 1;
3044             if (isnan(im->minval))
3045                 im->minval=1;
3046             break;
3047         case 'c':
3048             if(sscanf(optarg,
3049                       "%10[A-Z]#%n%8lx%n",
3050                       col_nam,&col_start,&color,&col_end) == 2){
3051                 int ci;
3052                 int col_len = col_end - col_start;
3053                 switch (col_len){
3054                         case 6:
3055                                 color = (color << 8) + 0xff /* shift left by 8 */;
3056                                 break;
3057                         case 8:
3058                                 break;
3059                         default:
3060                                 rrd_set_error("the color format is #RRGGBB[AA]");
3061                                 return;
3062                 }
3063                 if((ci=grc_conv(col_nam)) != -1){
3064                     im->graph_col[ci]=color;
3065                 }  else {
3066                   rrd_set_error("invalid color name '%s'",col_nam);
3067                   return;
3068                 }
3069             } else {
3070                 rrd_set_error("invalid color def format");
3071                 return;
3072             }
3073             break;
3074         case 'n':{
3075             char prop[15];
3076             double size = 1;
3077             char font[1024];
3078
3079             if(sscanf(optarg,
3080                                 "%10[A-Z]:%lf:%1000s",
3081                                 prop,&size,font) == 3){
3082                 int sindex;
3083                 if((sindex=text_prop_conv(prop)) != -1){
3084                     im->text_prop[sindex].size=size;
3085                     strcpy(im->text_prop[sindex].font,font);
3086                     if (sindex==0) { /* the default */
3087                         im->text_prop[TEXT_PROP_TITLE].size=size;
3088                         strcpy(im->text_prop[TEXT_PROP_TITLE].font,font);
3089                         im->text_prop[TEXT_PROP_AXIS].size=size;
3090                         strcpy(im->text_prop[TEXT_PROP_AXIS].font,font);
3091                         im->text_prop[TEXT_PROP_UNIT].size=size;
3092                         strcpy(im->text_prop[TEXT_PROP_UNIT].font,font);
3093                         im->text_prop[TEXT_PROP_LEGEND].size=size;
3094                         strcpy(im->text_prop[TEXT_PROP_LEGEND].font,font);
3095                     }
3096                 } else {
3097                     rrd_set_error("invalid fonttag '%s'",prop);
3098                     return;
3099                 }
3100             } else {
3101                 rrd_set_error("invalid text property format");
3102                 return;
3103             }
3104             break;
3105         }
3106         case 'm':
3107             im->canvas->zoom = atof(optarg);
3108             if (im->canvas->zoom <= 0.0) {
3109                 rrd_set_error("zoom factor must be > 0");
3110                 return;
3111             }
3112           break;
3113         case 't':
3114             strncpy(im->title,optarg,150);
3115             im->title[150]='\0';
3116             break;
3117
3118         case 'R':
3119                 if ( strcmp( optarg, "normal" ) == 0 )
3120                         im->canvas->aa_type = AA_NORMAL;
3121                 else if ( strcmp( optarg, "light" ) == 0 )
3122                         im->canvas->aa_type = AA_LIGHT;
3123                 else if ( strcmp( optarg, "mono" ) == 0 )
3124                         im->canvas->aa_type = AA_NONE;
3125                 else
3126                 {
3127                         rrd_set_error("unknown font-render-mode '%s'", optarg );
3128                         return;
3129                 }
3130                 break;
3131
3132         case 'B':
3133             im->canvas->font_aa_threshold = atof(optarg);
3134                 break;
3135
3136         case '?':
3137             if (optopt != 0)
3138                 rrd_set_error("unknown option '%c'", optopt);
3139             else
3140                 rrd_set_error("unknown option '%s'",argv[optind-1]);
3141             return;
3142         }
3143     }
3144
3145     if (optind >= argc) {
3146        rrd_set_error("missing filename");
3147        return;
3148     }
3149
3150     if (im->logarithmic == 1 && (im->minval <= 0 || isnan(im->minval))){
3151         rrd_set_error("for a logarithmic yaxis you must specify a lower-limit > 0");
3152         return;
3153     }
3154
3155     if (proc_start_end(&start_tv,&end_tv,&start_tmp,&end_tmp) == -1){
3156         /* error string is set in parsetime.c */
3157         return;
3158     }
3159
3160     if (start_tmp < 3600*24*365*10){
3161         rrd_set_error("the first entry to fetch should be after 1980 (%ld)",start_tmp);
3162         return;
3163     }
3164
3165     if (end_tmp < start_tmp) {
3166         rrd_set_error("start (%ld) should be less than end (%ld)",
3167                start_tmp, end_tmp);
3168         return;
3169     }
3170
3171     im->start = start_tmp;
3172     im->end = end_tmp;
3173     im->step = max((long)im->step, (im->end-im->start)/im->xsize);
3174 }
3175
3176 int
3177 rrd_graph_check_vname(image_desc_t *im, char *varname, char *err)
3178 {
3179     if ((im->gdes[im->gdes_c-1].vidx=find_var(im,varname))==-1) {
3180         rrd_set_error("Unknown variable '%s' in %s",varname,err);
3181         return -1;
3182     }
3183     return 0;
3184 }
3185 int
3186 rrd_graph_color(image_desc_t *im, char *var, char *err, int optional)
3187 {
3188     char *color;
3189     graph_desc_t *gdp=&im->gdes[im->gdes_c-1];
3190
3191     color=strstr(var,"#");
3192     if (color==NULL) {
3193         if (optional==0) {
3194             rrd_set_error("Found no color in %s",err);
3195             return 0;
3196         }
3197         return 0;
3198     } else {
3199         int n=0;
3200         char *rest;
3201         gfx_color_t    col;
3202
3203         rest=strstr(color,":");
3204         if (rest!=NULL)
3205             n=rest-color;
3206         else
3207             n=strlen(color);
3208
3209         switch (n) {
3210             case 7:
3211                 sscanf(color,"#%6lx%n",&col,&n);
3212                 col = (col << 8) + 0xff /* shift left by 8 */;
3213                 if (n!=7) rrd_set_error("Color problem in %s",err);
3214                 break;
3215             case 9:
3216                 sscanf(color,"#%8lx%n",&col,&n);
3217                 if (n==9) break;
3218             default:
3219                 rrd_set_error("Color problem in %s",err);
3220         }
3221         if (rrd_test_error()) return 0;
3222         gdp->col = col;
3223         return n;
3224     }
3225 }
3226
3227
3228 int bad_format(char *fmt) {
3229     char *ptr;
3230     int n=0;
3231     ptr = fmt;
3232     while (*ptr != '\0')
3233         if (*ptr++ == '%') {
3234
3235              /* line cannot end with percent char */
3236              if (*ptr == '\0') return 1;
3237
3238              /* '%s', '%S' and '%%' are allowed */
3239              if (*ptr == 's' || *ptr == 'S' || *ptr == '%') ptr++;
3240
3241              /* or else '% 6.2lf' and such are allowed */
3242              else {
3243
3244                  /* optional padding character */
3245                  if (*ptr == ' ' || *ptr == '+' || *ptr == '-') ptr++;
3246
3247                  /* This should take care of 'm.n' with all three optional */
3248                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3249                  if (*ptr == '.') ptr++;
3250                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3251
3252                  /* Either 'le', 'lf' or 'lg' must follow here */
3253                  if (*ptr++ != 'l') return 1;
3254                  if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g') ptr++;
3255                  else return 1;
3256                  n++;
3257             }
3258          }
3259
3260       return (n!=1);
3261 }
3262
3263
3264 int
3265 vdef_parse(gdes,str)
3266 struct graph_desc_t *gdes;
3267 char *str;
3268 {
3269     /* A VDEF currently is either "func" or "param,func"
3270      * so the parsing is rather simple.  Change if needed.
3271      */
3272     double      param;
3273     char        func[30];
3274     int         n;
3275
3276     n=0;
3277     sscanf(str,"%le,%29[A-Z]%n",&param,func,&n);
3278     if (n== (int)strlen(str)) { /* matched */
3279         ;
3280     } else {
3281         n=0;
3282         sscanf(str,"%29[A-Z]%n",func,&n);
3283         if (n== (int)strlen(str)) { /* matched */
3284             param=DNAN;
3285         } else {
3286             rrd_set_error("Unknown function string '%s' in VDEF '%s'"
3287                 ,str
3288                 ,gdes->vname
3289                 );
3290             return -1;
3291         }
3292     }
3293     if          (!strcmp("PERCENT",func)) gdes->vf.op = VDEF_PERCENT;
3294     else if     (!strcmp("MAXIMUM",func)) gdes->vf.op = VDEF_MAXIMUM;
3295     else if     (!strcmp("AVERAGE",func)) gdes->vf.op = VDEF_AVERAGE;
3296     else if     (!strcmp("MINIMUM",func)) gdes->vf.op = VDEF_MINIMUM;
3297     else if     (!strcmp("TOTAL",  func)) gdes->vf.op = VDEF_TOTAL;
3298     else if     (!strcmp("FIRST",  func)) gdes->vf.op = VDEF_FIRST;
3299     else if     (!strcmp("LAST",   func)) gdes->vf.op = VDEF_LAST;
3300     else {
3301         rrd_set_error("Unknown function '%s' in VDEF '%s'\n"
3302             ,func
3303             ,gdes->vname
3304             );
3305         return -1;
3306     };
3307
3308     switch (gdes->vf.op) {
3309         case VDEF_PERCENT:
3310             if (isnan(param)) { /* no parameter given */
3311                 rrd_set_error("Function '%s' needs parameter in VDEF '%s'\n"
3312                     ,func
3313                     ,gdes->vname
3314                     );
3315                 return -1;
3316             };
3317             if (param>=0.0 && param<=100.0) {
3318                 gdes->vf.param = param;
3319                 gdes->vf.val   = DNAN;  /* undefined */
3320                 gdes->vf.when  = 0;     /* undefined */
3321             } else {
3322                 rrd_set_error("Parameter '%f' out of range in VDEF '%s'\n"
3323                     ,param
3324                     ,gdes->vname
3325                     );
3326                 return -1;
3327             };
3328             break;
3329         case VDEF_MAXIMUM:
3330         case VDEF_AVERAGE:
3331         case VDEF_MINIMUM:
3332         case VDEF_TOTAL:
3333         case VDEF_FIRST:
3334         case VDEF_LAST:
3335             if (isnan(param)) {
3336                 gdes->vf.param = DNAN;
3337                 gdes->vf.val   = DNAN;
3338                 gdes->vf.when  = 0;
3339             } else {
3340                 rrd_set_error("Function '%s' needs no parameter in VDEF '%s'\n"
3341                     ,func
3342                     ,gdes->vname
3343                     );
3344                 return -1;
3345             };
3346             break;
3347     };
3348     return 0;
3349 }
3350
3351
3352 int
3353 vdef_calc(im,gdi)
3354 image_desc_t *im;
3355 int gdi;
3356 {
3357     graph_desc_t        *src,*dst;
3358     rrd_value_t         *data;
3359     long                step,steps;
3360
3361     dst = &im->gdes[gdi];
3362     src = &im->gdes[dst->vidx];
3363     data = src->data + src->ds;
3364     steps = (src->end - src->start) / src->step;
3365
3366 #if 0
3367 printf("DEBUG: start == %lu, end == %lu, %lu steps\n"
3368     ,src->start
3369     ,src->end
3370     ,steps
3371     );
3372 #endif
3373
3374     switch (dst->vf.op) {
3375         case VDEF_PERCENT: {
3376                 rrd_value_t *   array;
3377                 int             field;
3378
3379
3380                 if ((array = malloc(steps*sizeof(double)))==NULL) {
3381                     rrd_set_error("malloc VDEV_PERCENT");
3382                     return -1;
3383                 }
3384                 for (step=0;step < steps; step++) {
3385                     array[step]=data[step*src->ds_cnt];
3386                 }
3387                 qsort(array,step,sizeof(double),vdef_percent_compar);
3388
3389                 field = (steps-1)*dst->vf.param/100;
3390                 dst->vf.val  = array[field];
3391                 dst->vf.when = 0;       /* no time component */
3392                 free(array);
3393 #if 0
3394 for(step=0;step<steps;step++)
3395 printf("DEBUG: %3li:%10.2f %c\n",step,array[step],step==field?'*':' ');
3396 #endif
3397             }
3398             break;
3399         case VDEF_MAXIMUM:
3400             step=0;
3401             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3402             if (step == steps) {
3403                 dst->vf.val  = DNAN;
3404                 dst->vf.when = 0;
3405             } else {
3406                 dst->vf.val  = data[step*src->ds_cnt];
3407                 dst->vf.when = src->start + (step+1)*src->step;
3408             }
3409             while (step != steps) {
3410                 if (finite(data[step*src->ds_cnt])) {
3411                     if (data[step*src->ds_cnt] > dst->vf.val) {
3412                         dst->vf.val  = data[step*src->ds_cnt];
3413                         dst->vf.when = src->start + (step+1)*src->step;
3414                     }
3415                 }
3416                 step++;
3417             }
3418             break;
3419         case VDEF_TOTAL:
3420         case VDEF_AVERAGE: {
3421             int cnt=0;
3422             double sum=0.0;
3423             for (step=0;step<steps;step++) {
3424                 if (finite(data[step*src->ds_cnt])) {
3425                     sum += data[step*src->ds_cnt];
3426                     cnt ++;
3427                 };
3428             }
3429             if (cnt) {
3430                 if (dst->vf.op == VDEF_TOTAL) {
3431                     dst->vf.val  = sum*src->step;
3432                     dst->vf.when = cnt*src->step;       /* not really "when" */
3433                 } else {
3434                     dst->vf.val = sum/cnt;
3435                     dst->vf.when = 0;   /* no time component */
3436                 };
3437             } else {
3438                 dst->vf.val  = DNAN;
3439                 dst->vf.when = 0;
3440             }
3441             }
3442             break;
3443         case VDEF_MINIMUM:
3444             step=0;
3445             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3446             if (step == steps) {
3447                 dst->vf.val  = DNAN;
3448                 dst->vf.when = 0;
3449             } else {
3450                 dst->vf.val  = data[step*src->ds_cnt];
3451                 dst->vf.when = src->start + (step+1)*src->step;
3452             }
3453             while (step != steps) {
3454                 if (finite(data[step*src->ds_cnt])) {
3455                     if (data[step*src->ds_cnt] < dst->vf.val) {
3456                         dst->vf.val  = data[step*src->ds_cnt];
3457                         dst->vf.when = src->start + (step+1)*src->step;
3458                     }
3459                 }
3460                 step++;
3461             }
3462             break;
3463         case VDEF_FIRST:
3464             /* The time value returned here is one step before the
3465              * actual time value.  This is the start of the first
3466              * non-NaN interval.
3467              */
3468             step=0;
3469             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3470             if (step == steps) { /* all entries were NaN */
3471                 dst->vf.val  = DNAN;
3472                 dst->vf.when = 0;
3473             } else {
3474                 dst->vf.val  = data[step*src->ds_cnt];
3475                 dst->vf.when = src->start + step*src->step;
3476             }
3477             break;
3478         case VDEF_LAST:
3479             /* The time value returned here is the
3480              * actual time value.  This is the end of the last
3481              * non-NaN interval.
3482              */
3483             step=steps-1;
3484             while (step >= 0 && isnan(data[step*src->ds_cnt])) step--;
3485             if (step < 0) { /* all entries were NaN */
3486                 dst->vf.val  = DNAN;
3487                 dst->vf.when = 0;
3488             } else {
3489                 dst->vf.val  = data[step*src->ds_cnt];
3490                 dst->vf.when = src->start + (step+1)*src->step;
3491             }
3492             break;
3493     }
3494     return 0;
3495 }
3496
3497 /* NaN < -INF < finite_values < INF */
3498 int
3499 vdef_percent_compar(a,b)
3500 const void *a,*b;
3501 {
3502     /* Equality is not returned; this doesn't hurt except
3503      * (maybe) for a little performance.
3504      */
3505
3506     /* First catch NaN values. They are smallest */
3507     if (isnan( *(double *)a )) return -1;
3508     if (isnan( *(double *)b )) return  1;
3509
3510     /* NaN doesn't reach this part so INF and -INF are extremes.
3511      * The sign from isinf() is compatible with the sign we return
3512      */
3513     if (isinf( *(double *)a )) return isinf( *(double *)a );
3514     if (isinf( *(double *)b )) return isinf( *(double *)b );
3515
3516     /* If we reach this, both values must be finite */
3517     if ( *(double *)a < *(double *)b ) return -1; else return 1;
3518 }