src/rrd_graph.c

   1 /****************************************************************************
   2  * RRDtool 1.2.3  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;
 155     } else if (yval < im->yorigin - im->ysize){
 156       yval = im->yorigin - im->ysize;
 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) { /* this is a VDEF data source */
 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 { /* normal variables and PREF(variables) */
 903
 904                             /* add one entry to the array that keeps track of the step sizes of the
 905                              * data sources going into the CDEF. */
 906                             if ((steparray =
 907                                  rrd_realloc(steparray,
 908                                                          (++stepcnt+1)*sizeof(*steparray)))==NULL){
 909                                  rrd_set_error("realloc steparray");
 910                                  rpnstack_free(&rpnstack);
 911                                  return -1;
 912                             };
 913
 914                             steparray[stepcnt-1] = im->gdes[ptr].step;
 915
 916                             /* adjust start and end of cdef (gdi) so
 917                              * that it runs from the latest start point
 918                              * to the earliest endpoint of any of the
 919                              * rras involved (ptr)
 920                              */
 921
 922                             if(im->gdes[gdi].start < im->gdes[ptr].start)
 923                                 im->gdes[gdi].start = im->gdes[ptr].start;
 924
 925                             if(im->gdes[gdi].end == 0 ||
 926                                         im->gdes[gdi].end > im->gdes[ptr].end)
 927                                 im->gdes[gdi].end = im->gdes[ptr].end;
 928
 929                             /* store pointer to the first element of
 930                              * the rra providing data for variable,
 931                              * further save step size and data source
 932                              * count of this rra
 933                              */
 934                             im->gdes[gdi].rpnp[rpi].data   = im->gdes[ptr].data + im->gdes[ptr].ds;
 935                             im->gdes[gdi].rpnp[rpi].step   = im->gdes[ptr].step;
 936                             im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
 937
 938                             /* backoff the *.data ptr; this is done so
 939                              * rpncalc() function doesn't have to treat
 940                              * the first case differently
 941                              */
 942                         } /* if ds_cnt != 0 */
 943                     } /* if OP_VARIABLE */
 944                 } /* loop through all rpi */
 945
 946                 /* move the data pointers to the correct period */
 947                 for(rpi=0;im->gdes[gdi].rpnp[rpi].op != OP_END;rpi++){
 948                     if(im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
 949                         im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER){
 950                         long ptr  = im->gdes[gdi].rpnp[rpi].ptr;
 951                         long diff = im->gdes[gdi].start - im->gdes[ptr].start;
 952
 953                         if(diff > 0)
 954                             im->gdes[gdi].rpnp[rpi].data += (diff / im->gdes[ptr].step) * im->gdes[ptr].ds_cnt;
 955                      }
 956                 }
 957
 958                 if(steparray == NULL){
 959                     rrd_set_error("rpn expressions without DEF"
 960                                 " or CDEF variables are not supported");
 961                     rpnstack_free(&rpnstack);
 962                     return -1;
 963                 }
 964                 steparray[stepcnt]=0;
 965                 /* Now find the resulting step.  All steps in all
 966                  * used RRAs have to be visited
 967                  */
 968                 im->gdes[gdi].step = lcd(steparray);
 969                 free(steparray);
 970                 if((im->gdes[gdi].data = malloc((
 971                                 (im->gdes[gdi].end-im->gdes[gdi].start)
 972                                     / im->gdes[gdi].step)
 973                                     * sizeof(double)))==NULL){
 974                     rrd_set_error("malloc im->gdes[gdi].data");
 975                     rpnstack_free(&rpnstack);
 976                     return -1;
 977                 }
 978
 979                 /* Step through the new cdef results array and
 980                  * calculate the values
 981                  */
 982                 for (now = im->gdes[gdi].start + im->gdes[gdi].step;
 983                                 now<=im->gdes[gdi].end;
 984                                 now += im->gdes[gdi].step)
 985                 {
 986                     rpnp_t  *rpnp = im -> gdes[gdi].rpnp;
 987
 988                     /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
 989                      * in this case we are advancing by timesteps;
 990                      * we use the fact that time_t is a synonym for long
 991                      */
 992                     if (rpn_calc(rpnp,&rpnstack,(long) now,
 993                                 im->gdes[gdi].data,++dataidx) == -1) {
 994                         /* rpn_calc sets the error string */
 995                         rpnstack_free(&rpnstack);
 996                         return -1;
 997                     }
 998                 } /* enumerate over time steps within a CDEF */
 999                 break;
1000             default:
1001                 continue;
1002         }
1003     } /* enumerate over CDEFs */
1004     rpnstack_free(&rpnstack);
1005     return 0;
1006 }
1007
1008 /* massage data so, that we get one value for each x coordinate in the graph */
1009 int
1010 data_proc( image_desc_t *im ){
1011     long i,ii;
1012     double pixstep = (double)(im->end-im->start)
1013         /(double)im->xsize; /* how much time
1014                                passes in one pixel */
1015     double paintval;
1016     double minval=DNAN,maxval=DNAN;
1017
1018     unsigned long gr_time;
1019
1020     /* memory for the processed data */
1021     for(i=0;i<im->gdes_c;i++) {
1022         if((im->gdes[i].gf==GF_LINE) ||
1023                 (im->gdes[i].gf==GF_AREA) ||
1024                 (im->gdes[i].gf==GF_TICK) ||
1025                 (im->gdes[i].gf==GF_STACK)) {
1026             if((im->gdes[i].p_data = malloc((im->xsize +1)
1027                                         * sizeof(rrd_value_t)))==NULL){
1028                 rrd_set_error("malloc data_proc");
1029                 return -1;
1030             }
1031         }
1032     }
1033
1034     for (i=0;i<im->xsize;i++) { /* for each pixel */
1035         long vidx;
1036         gr_time = im->start+pixstep*i; /* time of the current step */
1037         paintval=0.0;
1038
1039         for (ii=0;ii<im->gdes_c;ii++) {
1040             double value;
1041             switch (im->gdes[ii].gf) {
1042                 case GF_LINE:
1043                 case GF_AREA:
1044                 case GF_TICK:
1045                     if (!im->gdes[ii].stack)
1046                         paintval = 0.0;
1047                 case GF_STACK:
1048                     value = im->gdes[ii].yrule;
1049                     if (isnan(value) || (im->gdes[ii].gf == GF_TICK)) {
1050                         /* The time of the data doesn't necessarily match
1051                         ** the time of the graph. Beware.
1052                         */
1053                         vidx = im->gdes[ii].vidx;
1054                         if (im->gdes[vidx].gf == GF_VDEF) {
1055                             value = im->gdes[vidx].vf.val;
1056                         } else if (((long int)gr_time >= (long int)im->gdes[vidx].start) &&
1057                                    ((long int)gr_time <= (long int)im->gdes[vidx].end) ) {
1058                             value = im->gdes[vidx].data[
1059                                 (unsigned long) floor(
1060                                     (double)(gr_time - im->gdes[vidx].start)
1061                                                 / im->gdes[vidx].step)
1062                                 * im->gdes[vidx].ds_cnt
1063                                 + im->gdes[vidx].ds
1064                             ];
1065                         } else {
1066                             value = DNAN;
1067                         }
1068                     };
1069
1070                     if (! isnan(value)) {
1071                         paintval += value;
1072                         im->gdes[ii].p_data[i] = paintval;
1073                         /* GF_TICK: the data values are not
1074                         ** relevant for min and max
1075                         */
1076                         if (finite(paintval) && im->gdes[ii].gf != GF_TICK ) {
1077                             if (isnan(minval) || paintval <  minval)
1078                                 minval = paintval;
1079                             if (isnan(maxval) || paintval >  maxval)
1080                                 maxval = paintval;
1081                         }
1082                     } else {
1083                         im->gdes[ii].p_data[i] = DNAN;
1084                     }
1085                     break;
1086                 default:
1087                     break;
1088             }
1089         }
1090     }
1091
1092     /* if min or max have not been asigned a value this is because
1093        there was no data in the graph ... this is not good ...
1094        lets set these to dummy values then ... */
1095
1096     if (isnan(minval)) minval = 0.0;
1097     if (isnan(maxval)) maxval = 1.0;
1098
1099     /* adjust min and max values */
1100     if (isnan(im->minval)
1101         /* don't adjust low-end with log scale */
1102         || ((!im->logarithmic && !im->rigid) && im->minval > minval)
1103         )
1104         im->minval = minval;
1105     if (isnan(im->maxval)
1106         || (!im->rigid && im->maxval < maxval)
1107         ) {
1108         if (im->logarithmic)
1109             im->maxval = maxval * 1.1;
1110         else
1111             im->maxval = maxval;
1112     }
1113     /* make sure min is smaller than max */
1114     if (im->minval > im->maxval) {
1115             im->minval = 0.99 * im->maxval;
1116     }
1117
1118     /* make sure min and max are not equal */
1119     if (im->minval == im->maxval) {
1120         im->maxval *= 1.01;
1121         if (! im->logarithmic) {
1122             im->minval *= 0.99;
1123         }
1124         /* make sure min and max are not both zero */
1125         if (im->maxval == 0.0) {
1126             im->maxval = 1.0;
1127         }
1128     }
1129     return 0;
1130 }
1131
1132
1133
1134 /* identify the point where the first gridline, label ... gets placed */
1135
1136 time_t
1137 find_first_time(
1138     time_t   start, /* what is the initial time */
1139     enum tmt_en baseint,  /* what is the basic interval */
1140     long     basestep /* how many if these do we jump a time */
1141     )
1142 {
1143     struct tm tm;
1144     localtime_r(&start, &tm);
1145     switch(baseint){
1146     case TMT_SECOND:
1147         tm.tm_sec -= tm.tm_sec % basestep; break;
1148     case TMT_MINUTE:
1149         tm.tm_sec=0;
1150         tm.tm_min -= tm.tm_min % basestep;
1151         break;
1152     case TMT_HOUR:
1153         tm.tm_sec=0;
1154         tm.tm_min = 0;
1155         tm.tm_hour -= tm.tm_hour % basestep; break;
1156     case TMT_DAY:
1157         /* we do NOT look at the basestep for this ... */
1158         tm.tm_sec=0;
1159         tm.tm_min = 0;
1160         tm.tm_hour = 0; break;
1161     case TMT_WEEK:
1162         /* we do NOT look at the basestep for this ... */
1163         tm.tm_sec=0;
1164         tm.tm_min = 0;
1165         tm.tm_hour = 0;
1166         tm.tm_mday -= tm.tm_wday -1;    /* -1 because we want the monday */
1167         if (tm.tm_wday==0) tm.tm_mday -= 7; /* we want the *previous* monday */
1168         break;
1169     case TMT_MONTH:
1170         tm.tm_sec=0;
1171         tm.tm_min = 0;
1172         tm.tm_hour = 0;
1173         tm.tm_mday = 1;
1174         tm.tm_mon -= tm.tm_mon % basestep; break;
1175
1176     case TMT_YEAR:
1177         tm.tm_sec=0;
1178         tm.tm_min = 0;
1179         tm.tm_hour = 0;
1180         tm.tm_mday = 1;
1181         tm.tm_mon = 0;
1182         tm.tm_year -= (tm.tm_year+1900) % basestep;
1183
1184     }
1185     return mktime(&tm);
1186 }
1187 /* identify the point where the next gridline, label ... gets placed */
1188 time_t
1189 find_next_time(
1190     time_t   current, /* what is the initial time */
1191     enum tmt_en baseint,  /* what is the basic interval */
1192     long     basestep /* how many if these do we jump a time */
1193     )
1194 {
1195     struct tm tm;
1196     time_t madetime;
1197     localtime_r(&current, &tm);
1198     do {
1199         switch(baseint){
1200         case TMT_SECOND:
1201             tm.tm_sec += basestep; break;
1202         case TMT_MINUTE:
1203             tm.tm_min += basestep; break;
1204         case TMT_HOUR:
1205             tm.tm_hour += basestep; break;
1206         case TMT_DAY:
1207             tm.tm_mday += basestep; break;
1208         case TMT_WEEK:
1209             tm.tm_mday += 7*basestep; break;
1210         case TMT_MONTH:
1211             tm.tm_mon += basestep; break;
1212         case TMT_YEAR:
1213             tm.tm_year += basestep;
1214         }
1215         madetime = mktime(&tm);
1216     } while (madetime == -1); /* this is necessary to skip impssible times
1217                                  like the daylight saving time skips */
1218     return madetime;
1219
1220 }
1221
1222
1223 /* calculate values required for PRINT and GPRINT functions */
1224
1225 int
1226 print_calc(image_desc_t *im, char ***prdata)
1227 {
1228     long i,ii,validsteps;
1229     double printval;
1230     time_t printtime;
1231     int graphelement = 0;
1232     long vidx;
1233     int max_ii;
1234     double magfact = -1;
1235     char *si_symb = "";
1236     char *percent_s;
1237     int prlines = 1;
1238     if (im->imginfo) prlines++;
1239     for(i=0;i<im->gdes_c;i++){
1240         switch(im->gdes[i].gf){
1241         case GF_PRINT:
1242             prlines++;
1243             if(((*prdata) = rrd_realloc((*prdata),prlines*sizeof(char *)))==NULL){
1244                 rrd_set_error("realloc prdata");
1245                 return 0;
1246             }
1247         case GF_GPRINT:
1248             /* PRINT and GPRINT can now print VDEF generated values.
1249              * There's no need to do any calculations on them as these
1250              * calculations were already made.
1251              */
1252             vidx = im->gdes[i].vidx;
1253             if (im->gdes[vidx].gf==GF_VDEF) { /* simply use vals */
1254                 printval = im->gdes[vidx].vf.val;
1255                 printtime = im->gdes[vidx].vf.when;
1256             } else { /* need to calculate max,min,avg etcetera */
1257                 max_ii =((im->gdes[vidx].end
1258                         - im->gdes[vidx].start)
1259                         / im->gdes[vidx].step
1260                         * im->gdes[vidx].ds_cnt);
1261                 printval = DNAN;
1262                 validsteps = 0;
1263                 for(    ii=im->gdes[vidx].ds;
1264                         ii < max_ii;
1265                         ii+=im->gdes[vidx].ds_cnt){
1266                     if (! finite(im->gdes[vidx].data[ii]))
1267                         continue;
1268                     if (isnan(printval)){
1269                         printval = im->gdes[vidx].data[ii];
1270                         validsteps++;
1271                         continue;
1272                     }
1273
1274                     switch (im->gdes[i].cf){
1275                         case CF_HWPREDICT:
1276                         case CF_DEVPREDICT:
1277                         case CF_DEVSEASONAL:
1278                         case CF_SEASONAL:
1279                         case CF_AVERAGE:
1280                             validsteps++;
1281                             printval += im->gdes[vidx].data[ii];
1282                             break;
1283                         case CF_MINIMUM:
1284                             printval = min( printval, im->gdes[vidx].data[ii]);
1285                             break;
1286                         case CF_FAILURES:
1287                         case CF_MAXIMUM:
1288                             printval = max( printval, im->gdes[vidx].data[ii]);
1289                             break;
1290                         case CF_LAST:
1291                             printval = im->gdes[vidx].data[ii];
1292                     }
1293                 }
1294                 if (im->gdes[i].cf==CF_AVERAGE || im->gdes[i].cf > CF_LAST) {
1295                     if (validsteps > 1) {
1296                         printval = (printval / validsteps);
1297                     }
1298                 }
1299             } /* prepare printval */
1300
1301             if (!strcmp(im->gdes[i].format,"%c")) { /* VDEF time print */
1302                 char ctime_buf[128]; /* PS: for ctime_r, must be >= 26 chars */
1303                 int iii=0;
1304                 ctime_r(&printtime,ctime_buf);
1305                 while(isprint(ctime_buf[iii])){iii++;}
1306                 ctime_buf[iii]='\0';
1307                 if (im->gdes[i].gf == GF_PRINT){
1308                     (*prdata)[prlines-2] = malloc((FMT_LEG_LEN+2)*sizeof(char));
1309                     sprintf((*prdata)[prlines-2],"%s (%lu)",ctime_buf,printtime);
1310                     (*prdata)[prlines-1] = NULL;
1311                 } else {
1312                     sprintf(im->gdes[i].legend,"%s (%lu)",ctime_buf,printtime);
1313                     graphelement = 1;
1314                 }
1315             } else {
1316             if ((percent_s = strstr(im->gdes[i].format,"%S")) != NULL) {
1317                 /* Magfact is set to -1 upon entry to print_calc.  If it
1318                  * is still less than 0, then we need to run auto_scale.
1319                  * Otherwise, put the value into the correct units.  If
1320                  * the value is 0, then do not set the symbol or magnification
1321                  * so next the calculation will be performed again. */
1322                 if (magfact < 0.0) {
1323                     auto_scale(im,&printval,&si_symb,&magfact);
1324                     if (printval == 0.0)
1325                         magfact = -1.0;
1326                 } else {
1327                     printval /= magfact;
1328                 }
1329                 *(++percent_s) = 's';
1330             } else if (strstr(im->gdes[i].format,"%s") != NULL) {
1331                 auto_scale(im,&printval,&si_symb,&magfact);
1332             }
1333
1334             if (im->gdes[i].gf == GF_PRINT){
1335                 (*prdata)[prlines-2] = malloc((FMT_LEG_LEN+2)*sizeof(char));
1336                 (*prdata)[prlines-1] = NULL;
1337                 if (bad_format(im->gdes[i].format)) {
1338                         rrd_set_error("bad format for PRINT in '%s'", im->gdes[i].format);
1339                         return -1;
1340                 }
1341 #ifdef HAVE_SNPRINTF
1342                 snprintf((*prdata)[prlines-2],FMT_LEG_LEN,im->gdes[i].format,printval,si_symb);
1343 #else
1344                 sprintf((*prdata)[prlines-2],im->gdes[i].format,printval,si_symb);
1345 #endif
1346             } else {
1347                 /* GF_GPRINT */
1348
1349                 if (bad_format(im->gdes[i].format)) {
1350                         rrd_set_error("bad format for GPRINT in '%s'", im->gdes[i].format);
1351                         return -1;
1352                 }
1353 #ifdef HAVE_SNPRINTF
1354                 snprintf(im->gdes[i].legend,FMT_LEG_LEN-2,im->gdes[i].format,printval,si_symb);
1355 #else
1356                 sprintf(im->gdes[i].legend,im->gdes[i].format,printval,si_symb);
1357 #endif
1358                 graphelement = 1;
1359             }
1360             }
1361             break;
1362         case GF_LINE:
1363         case GF_AREA:
1364         case GF_TICK:
1365         case GF_STACK:
1366         case GF_HRULE:
1367         case GF_VRULE:
1368             graphelement = 1;
1369             break;
1370         case GF_COMMENT:
1371         case GF_DEF:
1372         case GF_CDEF:
1373         case GF_VDEF:
1374 #ifdef WITH_PIECHART
1375         case GF_PART:
1376 #endif
1377         case GF_SHIFT:
1378         case GF_XPORT:
1379             break;
1380         }
1381     }
1382     return graphelement;
1383 }
1384
1385
1386 /* place legends with color spots */
1387 int
1388 leg_place(image_desc_t *im)
1389 {
1390     /* graph labels */
1391     int   interleg = im->text_prop[TEXT_PROP_LEGEND].size*2.0;
1392     int   border = im->text_prop[TEXT_PROP_LEGEND].size*2.0;
1393     int   fill=0, fill_last;
1394     int   leg_c = 0;
1395     int   leg_x = border, leg_y = im->yimg;
1396     int   leg_cc;
1397     int   glue = 0;
1398     int   i,ii, mark = 0;
1399     char  prt_fctn; /*special printfunctions */
1400     int  *legspace;
1401
1402   if( !(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH) ) {
1403     if ((legspace = malloc(im->gdes_c*sizeof(int)))==NULL){
1404        rrd_set_error("malloc for legspace");
1405        return -1;
1406     }
1407
1408     for(i=0;i<im->gdes_c;i++){
1409         fill_last = fill;
1410
1411         /* hid legends for rules which are not displayed */
1412
1413         if(!(im->extra_flags & FORCE_RULES_LEGEND)) {
1414                 if (im->gdes[i].gf == GF_HRULE &&
1415                     (im->gdes[i].yrule < im->minval || im->gdes[i].yrule > im->maxval))
1416                     im->gdes[i].legend[0] = '\0';
1417
1418                 if (im->gdes[i].gf == GF_VRULE &&
1419                     (im->gdes[i].xrule < im->start || im->gdes[i].xrule > im->end))
1420                     im->gdes[i].legend[0] = '\0';
1421         }
1422
1423         leg_cc = strlen(im->gdes[i].legend);
1424
1425         /* is there a controle code ant the end of the legend string ? */
1426         /* and it is not a tab \\t */
1427         if (leg_cc >= 2 && im->gdes[i].legend[leg_cc-2] == '\\' && im->gdes[i].legend[leg_cc-1] != 't') {
1428             prt_fctn = im->gdes[i].legend[leg_cc-1];
1429             leg_cc -= 2;
1430             im->gdes[i].legend[leg_cc] = '\0';
1431         } else {
1432             prt_fctn = '\0';
1433         }
1434         /* remove exess space */
1435         while (prt_fctn=='g' &&
1436                leg_cc > 0 &&
1437                im->gdes[i].legend[leg_cc-1]==' '){
1438            leg_cc--;
1439            im->gdes[i].legend[leg_cc]='\0';
1440         }
1441         if (leg_cc != 0 ){
1442            legspace[i]=(prt_fctn=='g' ? 0 : interleg);
1443
1444            if (fill > 0){
1445                /* no interleg space if string ends in \g */
1446                fill += legspace[i];
1447             }
1448            fill += gfx_get_text_width(im->canvas, fill+border,
1449                                       im->text_prop[TEXT_PROP_LEGEND].font,
1450                                       im->text_prop[TEXT_PROP_LEGEND].size,
1451                                       im->tabwidth,
1452                                       im->gdes[i].legend, 0);
1453             leg_c++;
1454         } else {
1455            legspace[i]=0;
1456         }
1457         /* who said there was a special tag ... ?*/
1458         if (prt_fctn=='g') {
1459            prt_fctn = '\0';
1460         }
1461         if (prt_fctn == '\0') {
1462             if (i == im->gdes_c -1 ) prt_fctn ='l';
1463
1464             /* is it time to place the legends ? */
1465             if (fill > im->ximg - 2*border){
1466                 if (leg_c > 1) {
1467                     /* go back one */
1468                     i--;
1469                     fill = fill_last;
1470                     leg_c--;
1471                     prt_fctn = 'j';
1472                 } else {
1473                     prt_fctn = 'l';
1474                 }
1475
1476             }
1477         }
1478
1479
1480         if (prt_fctn != '\0'){
1481             leg_x = border;
1482             if (leg_c >= 2 && prt_fctn == 'j') {
1483                 glue = (im->ximg - fill - 2* border) / (leg_c-1);
1484             } else {
1485                 glue = 0;
1486             }
1487             if (prt_fctn =='c') leg_x =  (im->ximg - fill) / 2.0;
1488             if (prt_fctn =='r') leg_x =  im->ximg - fill - border;
1489
1490             for(ii=mark;ii<=i;ii++){
1491                 if(im->gdes[ii].legend[0]=='\0')
1492                     continue; /* skip empty legends */
1493                 im->gdes[ii].leg_x = leg_x;
1494                 im->gdes[ii].leg_y = leg_y;
1495                 leg_x +=
1496                  gfx_get_text_width(im->canvas, leg_x,
1497                                       im->text_prop[TEXT_PROP_LEGEND].font,
1498                                       im->text_prop[TEXT_PROP_LEGEND].size,
1499                                       im->tabwidth,
1500                                       im->gdes[ii].legend, 0)
1501                    + legspace[ii]
1502                    + glue;
1503             }
1504             leg_y += im->text_prop[TEXT_PROP_LEGEND].size*1.8;
1505             if (prt_fctn == 's') leg_y -=  im->text_prop[TEXT_PROP_LEGEND].size;
1506             fill = 0;
1507             leg_c = 0;
1508             mark = ii;
1509         }
1510     }
1511     im->yimg = leg_y;
1512     free(legspace);
1513   }
1514   return 0;
1515 }
1516
1517 /* create a grid on the graph. it determines what to do
1518    from the values of xsize, start and end */
1519
1520 /* the xaxis labels are determined from the number of seconds per pixel
1521    in the requested graph */
1522
1523
1524
1525 int
1526 calc_horizontal_grid(image_desc_t   *im)
1527 {
1528     double   range;
1529     double   scaledrange;
1530     int      pixel,i;
1531     int      gridind;
1532     int      decimals, fractionals;
1533
1534     im->ygrid_scale.labfact=2;
1535     gridind=-1;
1536     range =  im->maxval - im->minval;
1537     scaledrange = range / im->magfact;
1538
1539         /* does the scale of this graph make it impossible to put lines
1540            on it? If so, give up. */
1541         if (isnan(scaledrange)) {
1542                 return 0;
1543         }
1544
1545     /* find grid spaceing */
1546     pixel=1;
1547     if(isnan(im->ygridstep)){
1548         if(im->extra_flags & ALTYGRID) {
1549             /* find the value with max number of digits. Get number of digits */
1550             decimals = ceil(log10(max(fabs(im->maxval), fabs(im->minval))));
1551             if(decimals <= 0) /* everything is small. make place for zero */
1552                 decimals = 1;
1553
1554             fractionals = floor(log10(range));
1555             if(fractionals < 0) { /* small amplitude. */
1556                 int len = decimals - fractionals + 1;
1557                 if (im->unitslength < len) im->unitslength = len;
1558                 sprintf(im->ygrid_scale.labfmt, "%%%d.%df", len, -fractionals + 1);
1559             } else {
1560                 int len = decimals + 1;
1561                 if (im->unitslength < len) im->unitslength = len;
1562                 sprintf(im->ygrid_scale.labfmt, "%%%d.1f", len);
1563             }
1564             im->ygrid_scale.gridstep = pow((double)10, (double)fractionals);
1565             if(im->ygrid_scale.gridstep == 0) /* range is one -> 0.1 is reasonable scale */
1566                 im->ygrid_scale.gridstep = 0.1;
1567             /* should have at least 5 lines but no more then 15 */
1568             if(range/im->ygrid_scale.gridstep < 5)
1569                 im->ygrid_scale.gridstep /= 10;
1570             if(range/im->ygrid_scale.gridstep > 15)
1571                 im->ygrid_scale.gridstep *= 10;
1572             if(range/im->ygrid_scale.gridstep > 5) {
1573                 im->ygrid_scale.labfact = 1;
1574                 if(range/im->ygrid_scale.gridstep > 8)
1575                     im->ygrid_scale.labfact = 2;
1576             }
1577             else {
1578                 im->ygrid_scale.gridstep /= 5;
1579                 im->ygrid_scale.labfact = 5;
1580             }
1581         }
1582         else {
1583             for(i=0;ylab[i].grid > 0;i++){
1584                 pixel = im->ysize / (scaledrange / ylab[i].grid);
1585                 if (pixel > 7) {
1586                     gridind = i;
1587                     break;
1588                 }
1589             }
1590
1591             for(i=0; i<4;i++) {
1592                if (pixel * ylab[gridind].lfac[i] >=  2 * im->text_prop[TEXT_PROP_AXIS].size) {
1593                   im->ygrid_scale.labfact =  ylab[gridind].lfac[i];
1594                   break;
1595                }
1596             }
1597
1598             im->ygrid_scale.gridstep = ylab[gridind].grid * im->magfact;
1599         }
1600     } else {
1601         im->ygrid_scale.gridstep = im->ygridstep;
1602         im->ygrid_scale.labfact = im->ylabfact;
1603     }
1604     return 1;
1605 }
1606
1607 int draw_horizontal_grid(image_desc_t *im)
1608 {
1609     int      i;
1610     double   scaledstep;
1611     char     graph_label[100];
1612     double X0=im->xorigin;
1613     double X1=im->xorigin+im->xsize;
1614
1615     int sgrid = (int)( im->minval / im->ygrid_scale.gridstep - 1);
1616     int egrid = (int)( im->maxval / im->ygrid_scale.gridstep + 1);
1617     scaledstep = im->ygrid_scale.gridstep/im->magfact;
1618     for (i = sgrid; i <= egrid; i++){
1619        double Y0=ytr(im,im->ygrid_scale.gridstep*i);
1620        if ( Y0 >= im->yorigin-im->ysize
1621                  && Y0 <= im->yorigin){
1622             if(i % im->ygrid_scale.labfact == 0){
1623                 if (i==0 || im->symbol == ' ') {
1624                     if(scaledstep < 1){
1625                         if(im->extra_flags & ALTYGRID) {
1626                             sprintf(graph_label,im->ygrid_scale.labfmt,scaledstep*im->viewfactor*i);
1627                         }
1628                         else {
1629                             sprintf(graph_label,"%4.1f",scaledstep*im->viewfactor*i);
1630                         }
1631                     } else {
1632                         sprintf(graph_label,"%4.0f",scaledstep*im->viewfactor*i);
1633                     }
1634                 }else {
1635                     if(scaledstep < 1){
1636                         sprintf(graph_label,"%4.1f %c",scaledstep*im->viewfactor*i, im->symbol);
1637                     } else {
1638                         sprintf(graph_label,"%4.0f %c",scaledstep*im->viewfactor*i, im->symbol);
1639                     }
1640                 }
1641
1642                gfx_new_text ( im->canvas,
1643                               X0-im->text_prop[TEXT_PROP_AXIS].size, Y0,
1644                               im->graph_col[GRC_FONT],
1645                               im->text_prop[TEXT_PROP_AXIS].font,
1646                               im->text_prop[TEXT_PROP_AXIS].size,
1647                               im->tabwidth, 0.0, GFX_H_RIGHT, GFX_V_CENTER,
1648                               graph_label );
1649                gfx_new_dashed_line ( im->canvas,
1650                               X0-2,Y0,
1651                               X1+2,Y0,
1652                               MGRIDWIDTH, im->graph_col[GRC_MGRID],
1653                               im->grid_dash_on, im->grid_dash_off);
1654
1655             } else if (!(im->extra_flags & NOMINOR)) {
1656                gfx_new_dashed_line ( im->canvas,
1657                               X0-1,Y0,
1658                               X1+1,Y0,
1659                               GRIDWIDTH, im->graph_col[GRC_GRID],
1660                               im->grid_dash_on, im->grid_dash_off);
1661
1662             }
1663         }
1664     }
1665     return 1;
1666 }
1667
1668 /* logaritmic horizontal grid */
1669 int
1670 horizontal_log_grid(image_desc_t   *im)
1671 {
1672     double   pixpex;
1673     int      ii,i;
1674     int      minoridx=0, majoridx=0;
1675     char     graph_label[100];
1676     double   X0,X1,Y0;
1677     double   value, pixperstep, minstep;
1678
1679     /* find grid spaceing */
1680     pixpex= (double)im->ysize / (log10(im->maxval) - log10(im->minval));
1681
1682         if (isnan(pixpex)) {
1683                 return 0;
1684         }
1685
1686     for(i=0;yloglab[i][0] > 0;i++){
1687         minstep = log10(yloglab[i][0]);
1688         for(ii=1;yloglab[i][ii+1] > 0;ii++){
1689             if(yloglab[i][ii+2]==0){
1690                 minstep = log10(yloglab[i][ii+1])-log10(yloglab[i][ii]);
1691                 break;
1692             }
1693         }
1694         pixperstep = pixpex * minstep;
1695         if(pixperstep > 5){minoridx = i;}
1696        if(pixperstep > 2 *  im->text_prop[TEXT_PROP_LEGEND].size){majoridx = i;}
1697     }
1698
1699    X0=im->xorigin;
1700    X1=im->xorigin+im->xsize;
1701     /* paint minor grid */
1702     for (value = pow((double)10, log10(im->minval)
1703                           - fmod(log10(im->minval),log10(yloglab[minoridx][0])));
1704          value  <= im->maxval;
1705          value *= yloglab[minoridx][0]){
1706         if (value < im->minval) continue;
1707         i=0;
1708         while(yloglab[minoridx][++i] > 0){
1709            Y0 = ytr(im,value * yloglab[minoridx][i]);
1710            if (Y0 <= im->yorigin - im->ysize) break;
1711            gfx_new_dashed_line ( im->canvas,
1712                           X0-1,Y0,
1713                           X1+1,Y0,
1714                           GRIDWIDTH, im->graph_col[GRC_GRID],
1715                           im->grid_dash_on, im->grid_dash_off);
1716         }
1717     }
1718
1719     /* paint major grid and labels*/
1720     for (value = pow((double)10, log10(im->minval)
1721                           - fmod(log10(im->minval),log10(yloglab[majoridx][0])));
1722          value <= im->maxval;
1723          value *= yloglab[majoridx][0]){
1724         if (value < im->minval) continue;
1725         i=0;
1726         while(yloglab[majoridx][++i] > 0){
1727            Y0 = ytr(im,value * yloglab[majoridx][i]);
1728            if (Y0 <= im->yorigin - im->ysize) break;
1729            gfx_new_dashed_line ( im->canvas,
1730                           X0-2,Y0,
1731                           X1+2,Y0,
1732                           MGRIDWIDTH, im->graph_col[GRC_MGRID],
1733                           im->grid_dash_on, im->grid_dash_off);
1734
1735            sprintf(graph_label,"%3.0e",value * yloglab[majoridx][i]);
1736            gfx_new_text ( im->canvas,
1737                           X0-im->text_prop[TEXT_PROP_AXIS].size, Y0,
1738                           im->graph_col[GRC_FONT],
1739                           im->text_prop[TEXT_PROP_AXIS].font,
1740                           im->text_prop[TEXT_PROP_AXIS].size,
1741                           im->tabwidth,0.0, GFX_H_RIGHT, GFX_V_CENTER,
1742                           graph_label );
1743         }
1744     }
1745         return 1;
1746 }
1747
1748
1749 void
1750 vertical_grid(
1751     image_desc_t   *im )
1752 {
1753     int xlab_sel;               /* which sort of label and grid ? */
1754     time_t ti, tilab, timajor;
1755     long factor;
1756     char graph_label[100];
1757     double X0,Y0,Y1; /* points for filled graph and more*/
1758     struct tm tm;
1759
1760     /* the type of time grid is determined by finding
1761        the number of seconds per pixel in the graph */
1762
1763
1764     if(im->xlab_user.minsec == -1){
1765         factor=(im->end - im->start)/im->xsize;
1766         xlab_sel=0;
1767         while ( xlab[xlab_sel+1].minsec != -1
1768                 && xlab[xlab_sel+1].minsec <= factor){ xlab_sel++; }
1769         im->xlab_user.gridtm = xlab[xlab_sel].gridtm;
1770         im->xlab_user.gridst = xlab[xlab_sel].gridst;
1771         im->xlab_user.mgridtm = xlab[xlab_sel].mgridtm;
1772         im->xlab_user.mgridst = xlab[xlab_sel].mgridst;
1773         im->xlab_user.labtm = xlab[xlab_sel].labtm;
1774         im->xlab_user.labst = xlab[xlab_sel].labst;
1775         im->xlab_user.precis = xlab[xlab_sel].precis;
1776         im->xlab_user.stst = xlab[xlab_sel].stst;
1777     }
1778
1779     /* y coords are the same for every line ... */
1780     Y0 = im->yorigin;
1781     Y1 = im->yorigin-im->ysize;
1782
1783
1784     /* paint the minor grid */
1785     if (!(im->extra_flags & NOMINOR))
1786     {
1787         for(ti = find_first_time(im->start,
1788                                 im->xlab_user.gridtm,
1789                                 im->xlab_user.gridst),
1790             timajor = find_first_time(im->start,
1791                                 im->xlab_user.mgridtm,
1792                                 im->xlab_user.mgridst);
1793             ti < im->end;
1794             ti = find_next_time(ti,im->xlab_user.gridtm,im->xlab_user.gridst)
1795             ){
1796             /* are we inside the graph ? */
1797             if (ti < im->start || ti > im->end) continue;
1798             while (timajor < ti) {
1799                 timajor = find_next_time(timajor,
1800                         im->xlab_user.mgridtm, im->xlab_user.mgridst);
1801             }
1802             if (ti == timajor) continue; /* skip as falls on major grid line */
1803            X0 = xtr(im,ti);
1804            gfx_new_dashed_line(im->canvas,X0,Y0+1, X0,Y1-1,GRIDWIDTH,
1805                im->graph_col[GRC_GRID],
1806                im->grid_dash_on, im->grid_dash_off);
1807
1808         }
1809     }
1810
1811     /* paint the major grid */
1812     for(ti = find_first_time(im->start,
1813                             im->xlab_user.mgridtm,
1814                             im->xlab_user.mgridst);
1815         ti < im->end;
1816         ti = find_next_time(ti,im->xlab_user.mgridtm,im->xlab_user.mgridst)
1817         ){
1818         /* are we inside the graph ? */
1819         if (ti < im->start || ti > im->end) continue;
1820        X0 = xtr(im,ti);
1821        gfx_new_dashed_line(im->canvas,X0,Y0+3, X0,Y1-2,MGRIDWIDTH,
1822            im->graph_col[GRC_MGRID],
1823            im->grid_dash_on, im->grid_dash_off);
1824
1825     }
1826     /* paint the labels below the graph */
1827     for(ti = find_first_time(im->start - im->xlab_user.precis/2,
1828                             im->xlab_user.labtm,
1829                             im->xlab_user.labst);
1830         ti <= im->end - im->xlab_user.precis/2;
1831         ti = find_next_time(ti,im->xlab_user.labtm,im->xlab_user.labst)
1832         ){
1833         tilab= ti + im->xlab_user.precis/2; /* correct time for the label */
1834         /* are we inside the graph ? */
1835         if (tilab < im->start || tilab > im->end) continue;
1836
1837 #if HAVE_STRFTIME
1838         localtime_r(&tilab, &tm);
1839         strftime(graph_label,99,im->xlab_user.stst, &tm);
1840 #else
1841 # error "your libc has no strftime I guess we'll abort the exercise here."
1842 #endif
1843        gfx_new_text ( im->canvas,
1844                       xtr(im,tilab), Y0+im->text_prop[TEXT_PROP_AXIS].size,
1845                       im->graph_col[GRC_FONT],
1846                       im->text_prop[TEXT_PROP_AXIS].font,
1847                       im->text_prop[TEXT_PROP_AXIS].size,
1848                       im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_TOP,
1849                       graph_label );
1850
1851     }
1852
1853 }
1854
1855
1856 void
1857 axis_paint(
1858    image_desc_t   *im
1859            )
1860 {
1861     /* draw x and y axis */
1862     /* gfx_new_line ( im->canvas, im->xorigin+im->xsize,im->yorigin,
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,im->yorigin-im->ysize,
1867                          im->xorigin+im->xsize,im->yorigin-im->ysize,
1868                          GRIDWIDTH, im->graph_col[GRC_AXIS]); */
1869
1870        gfx_new_line ( im->canvas, im->xorigin-4,im->yorigin,
1871                          im->xorigin+im->xsize+4,im->yorigin,
1872                          MGRIDWIDTH, im->graph_col[GRC_AXIS]);
1873
1874        gfx_new_line ( im->canvas, im->xorigin,im->yorigin+4,
1875                          im->xorigin,im->yorigin-im->ysize-4,
1876                          MGRIDWIDTH, im->graph_col[GRC_AXIS]);
1877
1878
1879     /* arrow for X and Y axis direction */
1880     gfx_new_area ( im->canvas,
1881                    im->xorigin+im->xsize+2,  im->yorigin-2,
1882                    im->xorigin+im->xsize+2,  im->yorigin+3,
1883                    im->xorigin+im->xsize+7,  im->yorigin+0.5, /* LINEOFFSET */
1884                    im->graph_col[GRC_ARROW]);
1885
1886     gfx_new_area ( im->canvas,
1887                    im->xorigin-2,  im->yorigin-im->ysize-2,
1888                    im->xorigin+3,  im->yorigin-im->ysize-2,
1889                    im->xorigin+0.5,    im->yorigin-im->ysize-7, /* LINEOFFSET */
1890                    im->graph_col[GRC_ARROW]);
1891
1892 }
1893
1894 void
1895 grid_paint(image_desc_t   *im)
1896 {
1897     long i;
1898     int res=0;
1899     double X0,Y0; /* points for filled graph and more*/
1900     gfx_node_t *node;
1901
1902     /* draw 3d border */
1903     node = gfx_new_area (im->canvas, 0,im->yimg,
1904                                  2,im->yimg-2,
1905                                  2,2,im->graph_col[GRC_SHADEA]);
1906     gfx_add_point( node , im->ximg - 2, 2 );
1907     gfx_add_point( node , im->ximg, 0 );
1908     gfx_add_point( node , 0,0 );
1909 /*    gfx_add_point( node , 0,im->yimg ); */
1910
1911     node =  gfx_new_area (im->canvas, 2,im->yimg-2,
1912                                   im->ximg-2,im->yimg-2,
1913                                   im->ximg - 2, 2,
1914                                  im->graph_col[GRC_SHADEB]);
1915     gfx_add_point( node ,   im->ximg,0);
1916     gfx_add_point( node ,   im->ximg,im->yimg);
1917     gfx_add_point( node ,   0,im->yimg);
1918 /*    gfx_add_point( node , 0,im->yimg ); */
1919
1920
1921     if (im->draw_x_grid == 1 )
1922       vertical_grid(im);
1923
1924     if (im->draw_y_grid == 1){
1925         if(im->logarithmic){
1926                 res = horizontal_log_grid(im);
1927         } else {
1928                 res = draw_horizontal_grid(im);
1929         }
1930
1931         /* dont draw horizontal grid if there is no min and max val */
1932         if (! res ) {
1933           char *nodata = "No Data found";
1934            gfx_new_text(im->canvas,im->ximg/2, (2*im->yorigin-im->ysize) / 2,
1935                         im->graph_col[GRC_FONT],
1936                         im->text_prop[TEXT_PROP_AXIS].font,
1937                         im->text_prop[TEXT_PROP_AXIS].size,
1938                         im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_CENTER,
1939                         nodata );
1940         }
1941     }
1942
1943     /* yaxis unit description */
1944     gfx_new_text( im->canvas,
1945                   12, (im->yorigin - im->ysize/2),
1946                   im->graph_col[GRC_FONT],
1947                   im->text_prop[TEXT_PROP_UNIT].font,
1948                   im->text_prop[TEXT_PROP_UNIT].size, im->tabwidth,
1949                   RRDGRAPH_YLEGEND_ANGLE,
1950                   GFX_H_LEFT, GFX_V_CENTER,
1951                   im->ylegend);
1952
1953     /* graph title */
1954     gfx_new_text( im->canvas,
1955                   im->ximg/2, im->text_prop[TEXT_PROP_TITLE].size*1.3+4,
1956                   im->graph_col[GRC_FONT],
1957                   im->text_prop[TEXT_PROP_TITLE].font,
1958                   im->text_prop[TEXT_PROP_TITLE].size, im->tabwidth, 0.0,
1959                   GFX_H_CENTER, GFX_V_CENTER,
1960                   im->title);
1961     /* rrdtool 'logo' */
1962     gfx_new_text( im->canvas,
1963                   im->ximg-7, 7,
1964                   ( im->graph_col[GRC_FONT] & 0xffffff00 ) | 0x00000066,
1965                   im->text_prop[TEXT_PROP_AXIS].font,
1966                   5.5, im->tabwidth, 270,
1967                   GFX_H_RIGHT, GFX_V_TOP,
1968                   "RRDTOOL / TOBI OETIKER");
1969
1970     /* graph labels */
1971     if( !(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH) ) {
1972             for(i=0;i<im->gdes_c;i++){
1973                     if(im->gdes[i].legend[0] =='\0')
1974                             continue;
1975
1976                     /* im->gdes[i].leg_y is the bottom of the legend */
1977                     X0 = im->gdes[i].leg_x;
1978                     Y0 = im->gdes[i].leg_y;
1979                     gfx_new_text ( im->canvas, X0, Y0,
1980                                    im->graph_col[GRC_FONT],
1981                                    im->text_prop[TEXT_PROP_LEGEND].font,
1982                                    im->text_prop[TEXT_PROP_LEGEND].size,
1983                                    im->tabwidth,0.0, GFX_H_LEFT, GFX_V_BOTTOM,
1984                                    im->gdes[i].legend );
1985                     /* The legend for GRAPH items starts with "M " to have
1986                        enough space for the box */
1987                     if (           im->gdes[i].gf != GF_PRINT &&
1988                                    im->gdes[i].gf != GF_GPRINT &&
1989                                    im->gdes[i].gf != GF_COMMENT) {
1990                             int boxH, boxV;
1991
1992                             boxH = gfx_get_text_width(im->canvas, 0,
1993                                                       im->text_prop[TEXT_PROP_LEGEND].font,
1994                                                       im->text_prop[TEXT_PROP_LEGEND].size,
1995                                                       im->tabwidth,"M", 0)*1.2;
1996                             boxV = boxH;
1997
1998                             /* make sure transparent colors show up all the same */
1999                             node = gfx_new_area(im->canvas,
2000                                                 X0,Y0-boxV,
2001                                                 X0,Y0,
2002                                                 X0+boxH,Y0,
2003                                                 im->graph_col[GRC_CANVAS]);
2004                             gfx_add_point ( node, X0+boxH, Y0-boxV );
2005
2006                             node = gfx_new_area(im->canvas,
2007                                                 X0,Y0-boxV,
2008                                                 X0,Y0,
2009                                                 X0+boxH,Y0,
2010                                                 im->gdes[i].col);
2011                             gfx_add_point ( node, X0+boxH, Y0-boxV );
2012                             node = gfx_new_line(im->canvas,
2013                                                 X0,Y0-boxV, X0,Y0,
2014                                                 1,im->graph_col[GRC_FONT]);
2015                             gfx_add_point(node,X0+boxH,Y0);
2016                             gfx_add_point(node,X0+boxH,Y0-boxV);
2017                             gfx_close_path(node);
2018                     }
2019             }
2020     }
2021 }
2022
2023
2024 /*****************************************************
2025  * lazy check make sure we rely need to create this graph
2026  *****************************************************/
2027
2028 int lazy_check(image_desc_t *im){
2029     FILE *fd = NULL;
2030         int size = 1;
2031     struct stat  imgstat;
2032
2033     if (im->lazy == 0) return 0; /* no lazy option */
2034     if (stat(im->graphfile,&imgstat) != 0)
2035       return 0; /* can't stat */
2036     /* one pixel in the existing graph is more then what we would
2037        change here ... */
2038     if (time(NULL) - imgstat.st_mtime >
2039         (im->end - im->start) / im->xsize)
2040       return 0;
2041     if ((fd = fopen(im->graphfile,"rb")) == NULL)
2042       return 0; /* the file does not exist */
2043     switch (im->canvas->imgformat) {
2044     case IF_PNG:
2045            size = PngSize(fd,&(im->ximg),&(im->yimg));
2046            break;
2047     default:
2048            size = 1;
2049     }
2050     fclose(fd);
2051     return size;
2052 }
2053
2054 #ifdef WITH_PIECHART
2055 void
2056 pie_part(image_desc_t *im, gfx_color_t color,
2057             double PieCenterX, double PieCenterY, double Radius,
2058             double startangle, double endangle)
2059 {
2060     gfx_node_t *node;
2061     double angle;
2062     double step=M_PI/50; /* Number of iterations for the circle;
2063                          ** 10 is definitely too low, more than
2064                          ** 50 seems to be overkill
2065                          */
2066
2067     /* Strange but true: we have to work clockwise or else
2068     ** anti aliasing nor transparency don't work.
2069     **
2070     ** This test is here to make sure we do it right, also
2071     ** this makes the for...next loop more easy to implement.
2072     ** The return will occur if the user enters a negative number
2073     ** (which shouldn't be done according to the specs) or if the
2074     ** programmers do something wrong (which, as we all know, never
2075     ** happens anyway :)
2076     */
2077     if (endangle<startangle) return;
2078
2079     /* Hidden feature: Radius decreases each full circle */
2080     angle=startangle;
2081     while (angle>=2*M_PI) {
2082         angle  -= 2*M_PI;
2083         Radius *= 0.8;
2084     }
2085
2086     node=gfx_new_area(im->canvas,
2087                 PieCenterX+sin(startangle)*Radius,
2088                 PieCenterY-cos(startangle)*Radius,
2089                 PieCenterX,
2090                 PieCenterY,
2091                 PieCenterX+sin(endangle)*Radius,
2092                 PieCenterY-cos(endangle)*Radius,
2093                 color);
2094     for (angle=endangle;angle-startangle>=step;angle-=step) {
2095         gfx_add_point(node,
2096                 PieCenterX+sin(angle)*Radius,
2097                 PieCenterY-cos(angle)*Radius );
2098     }
2099 }
2100
2101 #endif
2102
2103 int
2104 graph_size_location(image_desc_t *im, int elements
2105
2106 #ifdef WITH_PIECHART
2107 , int piechart
2108 #endif
2109
2110  )
2111 {
2112     /* The actual size of the image to draw is determined from
2113     ** several sources.  The size given on the command line is
2114     ** the graph area but we need more as we have to draw labels
2115     ** and other things outside the graph area
2116     */
2117
2118     /* +-+-------------------------------------------+
2119     ** |l|.................title.....................|
2120     ** |e+--+-------------------------------+--------+
2121     ** |b| b|                               |        |
2122     ** |a| a|                               |  pie   |
2123     ** |l| l|          main graph area      | chart  |
2124     ** |.| .|                               |  area  |
2125     ** |t| y|                               |        |
2126     ** |r+--+-------------------------------+--------+
2127     ** |e|  | x-axis labels                 |        |
2128     ** |v+--+-------------------------------+--------+
2129     ** | |..............legends......................|
2130     ** +-+-------------------------------------------+
2131     */
2132     int Xvertical=0,
2133                         Ytitle   =0,
2134         Xylabel  =0,
2135         Xmain    =0,    Ymain    =0,
2136 #ifdef WITH_PIECHART
2137         Xpie     =0,    Ypie     =0,
2138 #endif
2139                         Yxlabel  =0,
2140 #if 0
2141         Xlegend  =0,    Ylegend  =0,
2142 #endif
2143         Xspacing =15,  Yspacing =15;
2144
2145     if (im->extra_flags & ONLY_GRAPH) {
2146         im->xorigin =0;
2147         im->ximg = im->xsize;
2148         im->yimg = im->ysize;
2149         im->yorigin = im->ysize;
2150         return 0;
2151     }
2152
2153     if (im->ylegend[0] != '\0' ) {
2154            Xvertical = im->text_prop[TEXT_PROP_UNIT].size *1.6;
2155     }
2156
2157
2158     if (im->title[0] != '\0') {
2159         /* The title is placed "inbetween" two text lines so it
2160         ** automatically has some vertical spacing.  The horizontal
2161         ** spacing is added here, on each side.
2162         */
2163         /* don't care for the with of the title
2164                 Xtitle = gfx_get_text_width(im->canvas, 0,
2165                 im->text_prop[TEXT_PROP_TITLE].font,
2166                 im->text_prop[TEXT_PROP_TITLE].size,
2167                 im->tabwidth,
2168                 im->title, 0) + 2*Xspacing; */
2169         Ytitle = im->text_prop[TEXT_PROP_TITLE].size*2.6+10;
2170     }
2171
2172     if (elements) {
2173         Xmain=im->xsize;
2174         Ymain=im->ysize;
2175         if (im->draw_x_grid) {
2176             Yxlabel=im->text_prop[TEXT_PROP_AXIS].size *2.5;
2177         }
2178         if (im->draw_y_grid) {
2179             Xylabel=gfx_get_text_width(im->canvas, 0,
2180                         im->text_prop[TEXT_PROP_AXIS].font,
2181                         im->text_prop[TEXT_PROP_AXIS].size,
2182                         im->tabwidth,
2183                         "0", 0) * im->unitslength + Xspacing;
2184         }
2185     }
2186
2187 #ifdef WITH_PIECHART
2188     if (piechart) {
2189         im->piesize=im->xsize<im->ysize?im->xsize:im->ysize;
2190         Xpie=im->piesize;
2191         Ypie=im->piesize;
2192     }
2193 #endif
2194
2195     /* Now calculate the total size.  Insert some spacing where
2196        desired.  im->xorigin and im->yorigin need to correspond
2197        with the lower left corner of the main graph area or, if
2198        this one is not set, the imaginary box surrounding the
2199        pie chart area. */
2200
2201     /* The legend width cannot yet be determined, as a result we
2202     ** have problems adjusting the image to it.  For now, we just
2203     ** forget about it at all; the legend will have to fit in the
2204     ** size already allocated.
2205     */
2206     im->ximg = Xylabel + Xmain + 2 * Xspacing;
2207
2208 #ifdef WITH_PIECHART
2209     im->ximg  += Xpie;
2210 #endif
2211
2212     if (Xmain) im->ximg += Xspacing;
2213 #ifdef WITH_PIECHART
2214     if (Xpie) im->ximg += Xspacing;
2215 #endif
2216
2217     im->xorigin = Xspacing + Xylabel;
2218
2219     /* the length of the title should not influence with width of the graph
2220        if (Xtitle > im->ximg) im->ximg = Xtitle; */
2221
2222     if (Xvertical) { /* unit description */
2223         im->ximg += Xvertical;
2224         im->xorigin += Xvertical;
2225     }
2226     xtr(im,0);
2227
2228     /* The vertical size is interesting... we need to compare
2229     ** the sum of {Ytitle, Ymain, Yxlabel, Ylegend} with Yvertical
2230     ** however we need to know {Ytitle+Ymain+Yxlabel} in order to
2231     ** start even thinking about Ylegend.
2232     **
2233     ** Do it in three portions: First calculate the inner part,
2234     ** then do the legend, then adjust the total height of the img.
2235     */
2236
2237     /* reserve space for main and/or pie */
2238
2239     im->yimg = Ymain + Yxlabel;
2240
2241 #ifdef WITH_PIECHART
2242     if (im->yimg < Ypie) im->yimg = Ypie;
2243 #endif
2244
2245     im->yorigin = im->yimg - Yxlabel;
2246
2247     /* reserve space for the title *or* some padding above the graph */
2248     if (Ytitle) {
2249         im->yimg += Ytitle;
2250         im->yorigin += Ytitle;
2251     } else {
2252         im->yimg += 1.5*Yspacing;
2253         im->yorigin += 1.5*Yspacing;
2254     }
2255     /* reserve space for padding below the graph */
2256     im->yimg += Yspacing;
2257     ytr(im,DNAN);
2258
2259     /* Determine where to place the legends onto the image.
2260     ** Adjust im->yimg to match the space requirements.
2261     */
2262     if(leg_place(im)==-1)
2263         return -1;
2264
2265
2266 #if 0
2267     if (Xlegend > im->ximg) {
2268         im->ximg = Xlegend;
2269         /* reposition Pie */
2270     }
2271 #endif
2272
2273 #ifdef WITH_PIECHART
2274     /* The pie is placed in the upper right hand corner,
2275     ** just below the title (if any) and with sufficient
2276     ** padding.
2277     */
2278     if (elements) {
2279         im->pie_x = im->ximg - Xspacing - Xpie/2;
2280         im->pie_y = im->yorigin-Ymain+Ypie/2;
2281     } else {
2282         im->pie_x = im->ximg/2;
2283         im->pie_y = im->yorigin-Ypie/2;
2284     }
2285 #endif
2286
2287     return 0;
2288 }
2289
2290 /* draw that picture thing ... */
2291 int
2292 graph_paint(image_desc_t *im, char ***calcpr)
2293 {
2294   int i,ii;
2295   int lazy =     lazy_check(im);
2296 #ifdef WITH_PIECHART
2297   int piechart = 0;
2298   double PieStart=0.0;
2299 #endif
2300   FILE  *fo;
2301   gfx_node_t *node;
2302
2303   double areazero = 0.0;
2304   enum gf_en stack_gf = GF_PRINT;
2305   graph_desc_t *lastgdes = NULL;
2306
2307   /* if we are lazy and there is nothing to PRINT ... quit now */
2308   if (lazy && im->prt_c==0) return 0;
2309
2310   /* pull the data from the rrd files ... */
2311
2312   if(data_fetch(im)==-1)
2313     return -1;
2314
2315   /* evaluate VDEF and CDEF operations ... */
2316   if(data_calc(im)==-1)
2317     return -1;
2318
2319 #ifdef WITH_PIECHART
2320   /* check if we need to draw a piechart */
2321   for(i=0;i<im->gdes_c;i++){
2322     if (im->gdes[i].gf == GF_PART) {
2323       piechart=1;
2324       break;
2325     }
2326   }
2327 #endif
2328
2329   /* calculate and PRINT and GPRINT definitions. We have to do it at
2330    * this point because it will affect the length of the legends
2331    * if there are no graph elements we stop here ...
2332    * if we are lazy, try to quit ...
2333    */
2334   i=print_calc(im,calcpr);
2335   if(i<0) return -1;
2336   if(((i==0)
2337 #ifdef WITH_PIECHART
2338 &&(piechart==0)
2339 #endif
2340 ) || lazy) return 0;
2341
2342 #ifdef WITH_PIECHART
2343   /* If there's only the pie chart to draw, signal this */
2344   if (i==0) piechart=2;
2345 #endif
2346
2347   /* get actual drawing data and find min and max values*/
2348   if(data_proc(im)==-1)
2349     return -1;
2350
2351   if(!im->logarithmic){si_unit(im);}        /* identify si magnitude Kilo, Mega Giga ? */
2352
2353   if(!im->rigid && ! im->logarithmic)
2354     expand_range(im);   /* make sure the upper and lower limit are
2355                            sensible values */
2356
2357   if (!calc_horizontal_grid(im))
2358     return -1;
2359
2360   if (im->gridfit)
2361     apply_gridfit(im);
2362
2363
2364 /**************************************************************
2365  *** Calculating sizes and locations became a bit confusing ***
2366  *** so I moved this into a separate function.              ***
2367  **************************************************************/
2368   if(graph_size_location(im,i
2369 #ifdef WITH_PIECHART
2370 ,piechart
2371 #endif
2372 )==-1)
2373     return -1;
2374
2375   /* the actual graph is created by going through the individual
2376      graph elements and then drawing them */
2377
2378   node=gfx_new_area ( im->canvas,
2379                       0, 0,
2380                       im->ximg, 0,
2381                       im->ximg, im->yimg,
2382                       im->graph_col[GRC_BACK]);
2383
2384   gfx_add_point(node,0, im->yimg);
2385
2386 #ifdef WITH_PIECHART
2387   if (piechart != 2) {
2388 #endif
2389     node=gfx_new_area ( im->canvas,
2390                       im->xorigin,             im->yorigin,
2391                       im->xorigin + im->xsize, im->yorigin,
2392                       im->xorigin + im->xsize, im->yorigin-im->ysize,
2393                       im->graph_col[GRC_CANVAS]);
2394
2395     gfx_add_point(node,im->xorigin, im->yorigin - im->ysize);
2396
2397     if (im->minval > 0.0)
2398       areazero = im->minval;
2399     if (im->maxval < 0.0)
2400       areazero = im->maxval;
2401 #ifdef WITH_PIECHART
2402    }
2403 #endif
2404
2405 #ifdef WITH_PIECHART
2406   if (piechart) {
2407     pie_part(im,im->graph_col[GRC_CANVAS],im->pie_x,im->pie_y,im->piesize*0.5,0,2*M_PI);
2408   }
2409 #endif
2410
2411   for(i=0;i<im->gdes_c;i++){
2412     switch(im->gdes[i].gf){
2413     case GF_CDEF:
2414     case GF_VDEF:
2415     case GF_DEF:
2416     case GF_PRINT:
2417     case GF_GPRINT:
2418     case GF_COMMENT:
2419     case GF_HRULE:
2420     case GF_VRULE:
2421     case GF_XPORT:
2422     case GF_SHIFT:
2423       break;
2424     case GF_TICK:
2425       for (ii = 0; ii < im->xsize; ii++)
2426         {
2427           if (!isnan(im->gdes[i].p_data[ii]) &&
2428               im->gdes[i].p_data[ii] > 0.0)
2429             {
2430               /* generate a tick */
2431               gfx_new_line(im->canvas, im -> xorigin + ii,
2432                            im -> yorigin - (im -> gdes[i].yrule * im -> ysize),
2433                            im -> xorigin + ii,
2434                            im -> yorigin,
2435                            1.0,
2436                            im -> gdes[i].col );
2437             }
2438         }
2439       break;
2440     case GF_LINE:
2441     case GF_AREA:
2442       stack_gf = im->gdes[i].gf;
2443     case GF_STACK:
2444       /* fix data points at oo and -oo */
2445       for(ii=0;ii<im->xsize;ii++){
2446         if (isinf(im->gdes[i].p_data[ii])){
2447           if (im->gdes[i].p_data[ii] > 0) {
2448             im->gdes[i].p_data[ii] = im->maxval ;
2449           } else {
2450             im->gdes[i].p_data[ii] = im->minval ;
2451           }
2452
2453         }
2454       } /* for */
2455
2456       /* *******************************************************
2457        a           ___. (a,t)
2458                   |   |    ___
2459               ____|   |   |   |
2460               |       |___|
2461        -------|--t-1--t--------------------------------
2462
2463       if we know the value at time t was a then
2464       we draw a square from t-1 to t with the value a.
2465
2466       ********************************************************* */
2467       if (im->gdes[i].col != 0x0){
2468         /* GF_LINE and friend */
2469         if(stack_gf == GF_LINE ){
2470           node = NULL;
2471           for(ii=1;ii<im->xsize;ii++){
2472             if (isnan(im->gdes[i].p_data[ii]) || (im->slopemode==1 && isnan(im->gdes[i].p_data[ii-1]))){
2473                 node = NULL;
2474                 continue;
2475             }
2476             if ( node == NULL ) {
2477                 if ( im->slopemode == 0 ){
2478                   node = gfx_new_line(im->canvas,
2479                                     ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2480                                     ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2481                                     im->gdes[i].linewidth,
2482                                     im->gdes[i].col);
2483                 } else {
2484                   node = gfx_new_line(im->canvas,
2485                                     ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii-1]),
2486                                     ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2487                                     im->gdes[i].linewidth,
2488                                     im->gdes[i].col);
2489                 }
2490              } else {
2491                if ( im->slopemode==0 ){
2492                    gfx_add_point(node,ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2493                };
2494                gfx_add_point(node,ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2495              };
2496
2497           }
2498         } else {
2499           float ybase0 = DNAN,ytop0=DNAN;
2500           for(ii=0;ii<im->xsize;ii++){
2501             /* keep things simple for now, just draw these bars
2502                do not try to build a big and complex area */
2503             float ybase,ytop;
2504             if ( im->slopemode == 0 && ii==0){
2505                 continue;
2506             }
2507             if ( isnan(im->gdes[i].p_data[ii]) ) {
2508                 ybase0 = DNAN;
2509                 continue;
2510             }
2511             ytop = ytr(im,im->gdes[i].p_data[ii]);
2512             if ( lastgdes && im->gdes[i].stack ) {
2513                   ybase = ytr(im,lastgdes->p_data[ii]);
2514             } else {
2515                   ybase = ytr(im,areazero);
2516             }
2517             if ( ybase == ytop ){
2518                 ybase0 = DNAN;
2519                 continue;
2520             }
2521             /* every area has to be wound clock-wise,
2522                so we have to make sur base remains base  */
2523             if (ybase > ytop){
2524                 float extra = ytop;
2525                 ytop = ybase;
2526                 ybase = extra;
2527             }
2528             if ( im->slopemode == 0){
2529                  ybase0 = ybase;
2530                  ytop0 = ytop;
2531             }
2532             if ( !isnan(ybase0) ){
2533                     node = gfx_new_area(im->canvas,
2534                                 ii-1+im->xorigin,ybase0,
2535                                 ii-1+im->xorigin,ytop0,
2536                                 ii+im->xorigin,ytop,
2537                                 im->gdes[i].col
2538                                );
2539                     gfx_add_point(node,
2540                                 ii+im->xorigin,ybase
2541                               );
2542             }
2543             ybase0=ybase;
2544             ytop0=ytop;
2545           }
2546         } /* else GF_LINE */
2547       } /* if color != 0x0 */
2548       /* make sure we do not run into trouble when stacking on NaN */
2549       for(ii=0;ii<im->xsize;ii++){
2550         if (isnan(im->gdes[i].p_data[ii])) {
2551           if (lastgdes && (im->gdes[i].stack)) {
2552             im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
2553           } else {
2554             im->gdes[i].p_data[ii] =  ytr(im,areazero);
2555           }
2556         }
2557       }
2558       lastgdes = &(im->gdes[i]);
2559       break;
2560 #ifdef WITH_PIECHART
2561     case GF_PART:
2562       if(isnan(im->gdes[i].yrule)) /* fetch variable */
2563         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2564
2565       if (finite(im->gdes[i].yrule)) {  /* even the fetched var can be NaN */
2566         pie_part(im,im->gdes[i].col,
2567                 im->pie_x,im->pie_y,im->piesize*0.4,
2568                 M_PI*2.0*PieStart/100.0,
2569                 M_PI*2.0*(PieStart+im->gdes[i].yrule)/100.0);
2570         PieStart += im->gdes[i].yrule;
2571       }
2572       break;
2573 #endif
2574
2575     } /* switch */
2576   }
2577 #ifdef WITH_PIECHART
2578   if (piechart==2) {
2579     im->draw_x_grid=0;
2580     im->draw_y_grid=0;
2581   }
2582 #endif
2583
2584
2585   /* grid_paint also does the text */
2586   if( !(im->extra_flags & ONLY_GRAPH) )
2587     grid_paint(im);
2588
2589
2590   if( !(im->extra_flags & ONLY_GRAPH) )
2591       axis_paint(im);
2592
2593   /* the RULES are the last thing to paint ... */
2594   for(i=0;i<im->gdes_c;i++){
2595
2596     switch(im->gdes[i].gf){
2597     case GF_HRULE:
2598       if(isnan(im->gdes[i].yrule)) { /* fetch variable */
2599         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2600       };
2601       if(im->gdes[i].yrule >= im->minval
2602          && im->gdes[i].yrule <= im->maxval)
2603         gfx_new_line(im->canvas,
2604                      im->xorigin,ytr(im,im->gdes[i].yrule),
2605                      im->xorigin+im->xsize,ytr(im,im->gdes[i].yrule),
2606                      1.0,im->gdes[i].col);
2607       break;
2608     case GF_VRULE:
2609       if(im->gdes[i].xrule == 0) { /* fetch variable */
2610         im->gdes[i].xrule = im->gdes[im->gdes[i].vidx].vf.when;
2611       };
2612       if(im->gdes[i].xrule >= im->start
2613          && im->gdes[i].xrule <= im->end)
2614         gfx_new_line(im->canvas,
2615                      xtr(im,im->gdes[i].xrule),im->yorigin,
2616                      xtr(im,im->gdes[i].xrule),im->yorigin-im->ysize,
2617                      1.0,im->gdes[i].col);
2618       break;
2619     default:
2620       break;
2621     }
2622   }
2623
2624
2625   if (strcmp(im->graphfile,"-")==0) {
2626     fo = im->graphhandle ? im->graphhandle : stdout;
2627 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2628     /* Change translation mode for stdout to BINARY */
2629     _setmode( _fileno( fo ), O_BINARY );
2630 #endif
2631   } else {
2632     if ((fo = fopen(im->graphfile,"wb")) == NULL) {
2633       rrd_set_error("Opening '%s' for write: %s",im->graphfile,
2634                     rrd_strerror(errno));
2635       return (-1);
2636     }
2637   }
2638   gfx_render (im->canvas,im->ximg,im->yimg,0x0,fo);
2639   if (strcmp(im->graphfile,"-") != 0)
2640     fclose(fo);
2641   return 0;
2642 }
2643
2644
2645 /*****************************************************
2646  * graph stuff
2647  *****************************************************/
2648
2649 int
2650 gdes_alloc(image_desc_t *im){
2651
2652     im->gdes_c++;
2653     if ((im->gdes = (graph_desc_t *) rrd_realloc(im->gdes, (im->gdes_c)
2654                                            * sizeof(graph_desc_t)))==NULL){
2655         rrd_set_error("realloc graph_descs");
2656         return -1;
2657     }
2658
2659
2660     im->gdes[im->gdes_c-1].step=im->step;
2661     im->gdes[im->gdes_c-1].stack=0;
2662     im->gdes[im->gdes_c-1].debug=0;
2663     im->gdes[im->gdes_c-1].start=im->start;
2664     im->gdes[im->gdes_c-1].end=im->end;
2665     im->gdes[im->gdes_c-1].vname[0]='\0';
2666     im->gdes[im->gdes_c-1].data=NULL;
2667     im->gdes[im->gdes_c-1].ds_namv=NULL;
2668     im->gdes[im->gdes_c-1].data_first=0;
2669     im->gdes[im->gdes_c-1].p_data=NULL;
2670     im->gdes[im->gdes_c-1].rpnp=NULL;
2671     im->gdes[im->gdes_c-1].shift=0;
2672     im->gdes[im->gdes_c-1].col = 0x0;
2673     im->gdes[im->gdes_c-1].legend[0]='\0';
2674     im->gdes[im->gdes_c-1].format[0]='\0';
2675     im->gdes[im->gdes_c-1].rrd[0]='\0';
2676     im->gdes[im->gdes_c-1].ds=-1;
2677     im->gdes[im->gdes_c-1].p_data=NULL;
2678     im->gdes[im->gdes_c-1].yrule=DNAN;
2679     im->gdes[im->gdes_c-1].xrule=0;
2680     return 0;
2681 }
2682
2683 /* copies input untill the first unescaped colon is found
2684    or until input ends. backslashes have to be escaped as well */
2685 int
2686 scan_for_col(char *input, int len, char *output)
2687 {
2688     int inp,outp=0;
2689     for (inp=0;
2690          inp < len &&
2691            input[inp] != ':' &&
2692            input[inp] != '\0';
2693          inp++){
2694       if (input[inp] == '\\' &&
2695           input[inp+1] != '\0' &&
2696           (input[inp+1] == '\\' ||
2697            input[inp+1] == ':')){
2698         output[outp++] = input[++inp];
2699       }
2700       else {
2701         output[outp++] = input[inp];
2702       }
2703     }
2704     output[outp] = '\0';
2705     return inp;
2706 }
2707 /* Some surgery done on this function, it became ridiculously big.
2708 ** Things moved:
2709 ** - initializing     now in rrd_graph_init()
2710 ** - options parsing  now in rrd_graph_options()
2711 ** - script parsing   now in rrd_graph_script()
2712 */
2713 int
2714 rrd_graph(int argc, char **argv, char ***prdata, int *xsize, int *ysize, FILE *stream, double *ymin, double *ymax)
2715 {
2716     image_desc_t   im;
2717     rrd_graph_init(&im);
2718     im.graphhandle = stream;
2719
2720     rrd_graph_options(argc,argv,&im);
2721     if (rrd_test_error()) {
2722         im_free(&im);
2723         return -1;
2724     }
2725
2726     if (strlen(argv[optind])>=MAXPATH) {
2727         rrd_set_error("filename (including path) too long");
2728         im_free(&im);
2729         return -1;
2730     }
2731     strncpy(im.graphfile,argv[optind],MAXPATH-1);
2732     im.graphfile[MAXPATH-1]='\0';
2733
2734     rrd_graph_script(argc,argv,&im,1);
2735     if (rrd_test_error()) {
2736         im_free(&im);
2737         return -1;
2738     }
2739
2740     /* Everything is now read and the actual work can start */
2741
2742     (*prdata)=NULL;
2743     if (graph_paint(&im,prdata)==-1){
2744         im_free(&im);
2745         return -1;
2746     }
2747
2748     /* The image is generated and needs to be output.
2749     ** Also, if needed, print a line with information about the image.
2750     */
2751
2752     *xsize=im.ximg;
2753     *ysize=im.yimg;
2754     *ymin=im.minval;
2755     *ymax=im.maxval;
2756     if (im.imginfo) {
2757         char *filename;
2758         if (!(*prdata)) {
2759             /* maybe prdata is not allocated yet ... lets do it now */
2760             if ((*prdata = calloc(2,sizeof(char *)))==NULL) {
2761                 rrd_set_error("malloc imginfo");
2762                 return -1;
2763             };
2764         }
2765         if(((*prdata)[0] = malloc((strlen(im.imginfo)+200+strlen(im.graphfile))*sizeof(char)))
2766          ==NULL){
2767             rrd_set_error("malloc imginfo");
2768             return -1;
2769         }
2770         filename=im.graphfile+strlen(im.graphfile);
2771         while(filename > im.graphfile) {
2772             if (*(filename-1)=='/' || *(filename-1)=='\\' ) break;
2773             filename--;
2774         }
2775
2776         sprintf((*prdata)[0],im.imginfo,filename,(long)(im.canvas->zoom*im.ximg),(long)(im.canvas->zoom*im.yimg));
2777     }
2778     im_free(&im);
2779     return 0;
2780 }
2781
2782 void
2783 rrd_graph_init(image_desc_t *im)
2784 {
2785     unsigned int i;
2786
2787 #ifdef HAVE_TZSET
2788     tzset();
2789 #endif
2790 #ifdef HAVE_SETLOCALE
2791     setlocale(LC_TIME,"");
2792 #endif
2793     im->yorigin=0;
2794     im->xorigin=0;
2795     im->minval=0;
2796     im->xlab_user.minsec = -1;
2797     im->ximg=0;
2798     im->yimg=0;
2799     im->xsize = 400;
2800     im->ysize = 100;
2801     im->step = 0;
2802     im->ylegend[0] = '\0';
2803     im->title[0] = '\0';
2804     im->minval = DNAN;
2805     im->maxval = DNAN;
2806     im->unitsexponent= 9999;
2807     im->unitslength= 5;
2808     im->symbol = ' ';
2809     im->viewfactor = 1.0;
2810     im->extra_flags= 0;
2811     im->rigid = 0;
2812     im->gridfit = 1;
2813     im->imginfo = NULL;
2814     im->lazy = 0;
2815     im->slopemode = 0;
2816     im->logarithmic = 0;
2817     im->ygridstep = DNAN;
2818     im->draw_x_grid = 1;
2819     im->draw_y_grid = 1;
2820     im->base = 1000;
2821     im->prt_c = 0;
2822     im->gdes_c = 0;
2823     im->gdes = NULL;
2824     im->canvas = gfx_new_canvas();
2825     im->grid_dash_on = 1;
2826     im->grid_dash_off = 1;
2827     im->tabwidth = 40.0;
2828
2829     for(i=0;i<DIM(graph_col);i++)
2830         im->graph_col[i]=graph_col[i];
2831
2832 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2833     {
2834             char *windir;
2835             char rrd_win_default_font[1000];
2836             windir = getenv("windir");
2837             /* %windir% is something like D:\windows or C:\winnt */
2838             if (windir != NULL) {
2839                     strncpy(rrd_win_default_font,windir,999);
2840                     rrd_win_default_font[999] = '\0';
2841                     strcat(rrd_win_default_font,"\\fonts\\");
2842                     strcat(rrd_win_default_font,RRD_DEFAULT_FONT);
2843                     for(i=0;i<DIM(text_prop);i++){
2844                             strncpy(text_prop[i].font,rrd_win_default_font,sizeof(text_prop[i].font)-1);
2845                             text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2846                      }
2847              }
2848     }
2849 #endif
2850     {
2851             char *deffont;
2852             deffont = getenv("RRD_DEFAULT_FONT");
2853             if (deffont != NULL) {
2854                  for(i=0;i<DIM(text_prop);i++){
2855                         strncpy(text_prop[i].font,deffont,sizeof(text_prop[i].font)-1);
2856                         text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2857                  }
2858             }
2859     }
2860     for(i=0;i<DIM(text_prop);i++){
2861       im->text_prop[i].size = text_prop[i].size;
2862       strcpy(im->text_prop[i].font,text_prop[i].font);
2863     }
2864 }
2865
2866 void
2867 rrd_graph_options(int argc, char *argv[],image_desc_t *im)
2868 {
2869     int                 stroff;
2870     char                *parsetime_error = NULL;
2871     char                scan_gtm[12],scan_mtm[12],scan_ltm[12],col_nam[12];
2872     time_t              start_tmp=0,end_tmp=0;
2873     long                long_tmp;
2874     struct rrd_time_value       start_tv, end_tv;
2875     gfx_color_t         color;
2876     optind = 0; opterr = 0;  /* initialize getopt */
2877
2878     parsetime("end-24h", &start_tv);
2879     parsetime("now", &end_tv);
2880
2881     while (1){
2882         static struct option long_options[] =
2883         {
2884             {"start",      required_argument, 0,  's'},
2885             {"end",        required_argument, 0,  'e'},
2886             {"x-grid",     required_argument, 0,  'x'},
2887             {"y-grid",     required_argument, 0,  'y'},
2888             {"vertical-label",required_argument,0,'v'},
2889             {"width",      required_argument, 0,  'w'},
2890             {"height",     required_argument, 0,  'h'},
2891             {"interlaced", no_argument,       0,  'i'},
2892             {"upper-limit",required_argument, 0,  'u'},
2893             {"lower-limit",required_argument, 0,  'l'},
2894             {"rigid",      no_argument,       0,  'r'},
2895             {"base",       required_argument, 0,  'b'},
2896             {"logarithmic",no_argument,       0,  'o'},
2897             {"color",      required_argument, 0,  'c'},
2898             {"font",       required_argument, 0,  'n'},
2899             {"title",      required_argument, 0,  't'},
2900             {"imginfo",    required_argument, 0,  'f'},
2901             {"imgformat",  required_argument, 0,  'a'},
2902             {"lazy",       no_argument,       0,  'z'},
2903             {"zoom",       required_argument, 0,  'm'},
2904             {"no-legend",  no_argument,       0,  'g'},
2905             {"force-rules-legend",no_argument,0,  'F'},
2906             {"only-graph", no_argument,       0,  'j'},
2907             {"alt-y-grid", no_argument,       0,  'Y'},
2908             {"no-minor",   no_argument,       0,  'I'},
2909             {"slope-mode", no_argument,       0,  'E'},
2910             {"alt-autoscale", no_argument,    0,  'A'},
2911             {"alt-autoscale-max", no_argument, 0, 'M'},
2912             {"no-gridfit", no_argument,       0,   'N'},
2913             {"units-exponent",required_argument, 0, 'X'},
2914             {"units-length",required_argument, 0, 'L'},
2915             {"step",       required_argument, 0,    'S'},
2916             {"tabwidth",   required_argument, 0,    'T'},
2917             {"font-render-mode", required_argument, 0, 'R'},
2918             {"font-smoothing-threshold", required_argument, 0, 'B'},
2919             {0,0,0,0}};
2920         int option_index = 0;
2921         int opt;
2922         int col_start,col_end;
2923
2924         opt = getopt_long(argc, argv,
2925                          "s:e:x:y:v:w:h:iu:l:rb:oc:n:m:t:f:a:I:zgjFYAMEX:L:S:T:NR:B:",
2926                           long_options, &option_index);
2927
2928         if (opt == EOF)
2929             break;
2930
2931         switch(opt) {
2932         case 'I':
2933             im->extra_flags |= NOMINOR;
2934             break;
2935         case 'Y':
2936             im->extra_flags |= ALTYGRID;
2937             break;
2938         case 'A':
2939             im->extra_flags |= ALTAUTOSCALE;
2940             break;
2941         case 'M':
2942             im->extra_flags |= ALTAUTOSCALE_MAX;
2943             break;
2944         case 'j':
2945            im->extra_flags |= ONLY_GRAPH;
2946            break;
2947         case 'g':
2948             im->extra_flags |= NOLEGEND;
2949             break;
2950         case 'F':
2951             im->extra_flags |= FORCE_RULES_LEGEND;
2952             break;
2953         case 'X':
2954             im->unitsexponent = atoi(optarg);
2955             break;
2956         case 'L':
2957             im->unitslength = atoi(optarg);
2958             break;
2959         case 'T':
2960             im->tabwidth = atof(optarg);
2961             break;
2962         case 'S':
2963             im->step =  atoi(optarg);
2964             break;
2965         case 'N':
2966             im->gridfit = 0;
2967             break;
2968         case 's':
2969             if ((parsetime_error = parsetime(optarg, &start_tv))) {
2970                 rrd_set_error( "start time: %s", parsetime_error );
2971                 return;
2972             }
2973             break;
2974         case 'e':
2975             if ((parsetime_error = parsetime(optarg, &end_tv))) {
2976                 rrd_set_error( "end time: %s", parsetime_error );
2977                 return;
2978             }
2979             break;
2980         case 'x':
2981             if(strcmp(optarg,"none") == 0){
2982               im->draw_x_grid=0;
2983               break;
2984             };
2985
2986             if(sscanf(optarg,
2987                       "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
2988                       scan_gtm,
2989                       &im->xlab_user.gridst,
2990                       scan_mtm,
2991                       &im->xlab_user.mgridst,
2992                       scan_ltm,
2993                       &im->xlab_user.labst,
2994                       &im->xlab_user.precis,
2995                       &stroff) == 7 && stroff != 0){
2996                 strncpy(im->xlab_form, optarg+stroff, sizeof(im->xlab_form) - 1);
2997                 im->xlab_form[sizeof(im->xlab_form)-1] = '\0';
2998                 if((int)(im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1){
2999                     rrd_set_error("unknown keyword %s",scan_gtm);
3000                     return;
3001                 } else if ((int)(im->xlab_user.mgridtm = tmt_conv(scan_mtm)) == -1){
3002                     rrd_set_error("unknown keyword %s",scan_mtm);
3003                     return;
3004                 } else if ((int)(im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1){
3005                     rrd_set_error("unknown keyword %s",scan_ltm);
3006                     return;
3007                 }
3008                 im->xlab_user.minsec = 1;
3009                 im->xlab_user.stst = im->xlab_form;
3010             } else {
3011                 rrd_set_error("invalid x-grid format");
3012                 return;
3013             }
3014             break;
3015         case 'y':
3016
3017             if(strcmp(optarg,"none") == 0){
3018               im->draw_y_grid=0;
3019               break;
3020             };
3021
3022             if(sscanf(optarg,
3023                       "%lf:%d",
3024                       &im->ygridstep,
3025                       &im->ylabfact) == 2) {
3026                 if(im->ygridstep<=0){
3027                     rrd_set_error("grid step must be > 0");
3028                     return;
3029                 } else if (im->ylabfact < 1){
3030                     rrd_set_error("label factor must be > 0");
3031                     return;
3032                 }
3033             } else {
3034                 rrd_set_error("invalid y-grid format");
3035                 return;
3036             }
3037             break;
3038         case 'v':
3039             strncpy(im->ylegend,optarg,150);
3040             im->ylegend[150]='\0';
3041             break;
3042         case 'u':
3043             im->maxval = atof(optarg);
3044             break;
3045         case 'l':
3046             im->minval = atof(optarg);
3047             break;
3048         case 'b':
3049             im->base = atol(optarg);
3050             if(im->base != 1024 && im->base != 1000 ){
3051                 rrd_set_error("the only sensible value for base apart from 1000 is 1024");
3052                 return;
3053             }
3054             break;
3055         case 'w':
3056             long_tmp = atol(optarg);
3057             if (long_tmp < 10) {
3058                 rrd_set_error("width below 10 pixels");
3059                 return;
3060             }
3061             im->xsize = long_tmp;
3062             break;
3063         case 'h':
3064             long_tmp = atol(optarg);
3065             if (long_tmp < 10) {
3066                 rrd_set_error("height below 10 pixels");
3067                 return;
3068             }
3069             im->ysize = long_tmp;
3070             break;
3071         case 'i':
3072             im->canvas->interlaced = 1;
3073             break;
3074         case 'r':
3075             im->rigid = 1;
3076             break;
3077         case 'f':
3078             im->imginfo = optarg;
3079             break;
3080         case 'a':
3081             if((int)(im->canvas->imgformat = if_conv(optarg)) == -1) {
3082                 rrd_set_error("unsupported graphics format '%s'",optarg);
3083                 return;
3084             }
3085             break;
3086         case 'z':
3087             im->lazy = 1;
3088             break;
3089         case 'E':
3090             im->slopemode = 1;
3091             break;
3092
3093         case 'o':
3094             im->logarithmic = 1;
3095             if (isnan(im->minval))
3096                 im->minval=1;
3097             break;
3098         case 'c':
3099             if(sscanf(optarg,
3100                       "%10[A-Z]#%n%8lx%n",
3101                       col_nam,&col_start,&color,&col_end) == 2){
3102                 int ci;
3103                 int col_len = col_end - col_start;
3104                 switch (col_len){
3105                         case 6:
3106                                 color = (color << 8) + 0xff /* shift left by 8 */;
3107                                 break;
3108                         case 8:
3109                                 break;
3110                         default:
3111                                 rrd_set_error("the color format is #RRGGBB[AA]");
3112                                 return;
3113                 }
3114                 if((ci=grc_conv(col_nam)) != -1){
3115                     im->graph_col[ci]=color;
3116                 }  else {
3117                   rrd_set_error("invalid color name '%s'",col_nam);
3118                   return;
3119                 }
3120             } else {
3121                 rrd_set_error("invalid color def format");
3122                 return;
3123             }
3124             break;
3125         case 'n':{
3126             char prop[15];
3127             double size = 1;
3128             char font[1024];
3129
3130             if(sscanf(optarg,
3131                                 "%10[A-Z]:%lf:%1000s",
3132                                 prop,&size,font) == 3){
3133                 int sindex;
3134                 if((sindex=text_prop_conv(prop)) != -1){
3135                     im->text_prop[sindex].size=size;
3136                     strcpy(im->text_prop[sindex].font,font);
3137                     if (sindex==0) { /* the default */
3138                         im->text_prop[TEXT_PROP_TITLE].size=size;
3139                         strcpy(im->text_prop[TEXT_PROP_TITLE].font,font);
3140                         im->text_prop[TEXT_PROP_AXIS].size=size;
3141                         strcpy(im->text_prop[TEXT_PROP_AXIS].font,font);
3142                         im->text_prop[TEXT_PROP_UNIT].size=size;
3143                         strcpy(im->text_prop[TEXT_PROP_UNIT].font,font);
3144                         im->text_prop[TEXT_PROP_LEGEND].size=size;
3145                         strcpy(im->text_prop[TEXT_PROP_LEGEND].font,font);
3146                     }
3147                 } else {
3148                     rrd_set_error("invalid fonttag '%s'",prop);
3149                     return;
3150                 }
3151             } else {
3152                 rrd_set_error("invalid text property format");
3153                 return;
3154             }
3155             break;
3156         }
3157         case 'm':
3158             im->canvas->zoom = atof(optarg);
3159             if (im->canvas->zoom <= 0.0) {
3160                 rrd_set_error("zoom factor must be > 0");
3161                 return;
3162             }
3163           break;
3164         case 't':
3165             strncpy(im->title,optarg,150);
3166             im->title[150]='\0';
3167             break;
3168
3169         case 'R':
3170                 if ( strcmp( optarg, "normal" ) == 0 )
3171                         im->canvas->aa_type = AA_NORMAL;
3172                 else if ( strcmp( optarg, "light" ) == 0 )
3173                         im->canvas->aa_type = AA_LIGHT;
3174                 else if ( strcmp( optarg, "mono" ) == 0 )
3175                         im->canvas->aa_type = AA_NONE;
3176                 else
3177                 {
3178                         rrd_set_error("unknown font-render-mode '%s'", optarg );
3179                         return;
3180                 }
3181                 break;
3182
3183         case 'B':
3184             im->canvas->font_aa_threshold = atof(optarg);
3185                 break;
3186
3187         case '?':
3188             if (optopt != 0)
3189                 rrd_set_error("unknown option '%c'", optopt);
3190             else
3191                 rrd_set_error("unknown option '%s'",argv[optind-1]);
3192             return;
3193         }
3194     }
3195
3196     if (optind >= argc) {
3197        rrd_set_error("missing filename");
3198        return;
3199     }
3200
3201     if (im->logarithmic == 1 && (im->minval <= 0 || isnan(im->minval))){
3202         rrd_set_error("for a logarithmic yaxis you must specify a lower-limit > 0");
3203         return;
3204     }
3205
3206     if (proc_start_end(&start_tv,&end_tv,&start_tmp,&end_tmp) == -1){
3207         /* error string is set in parsetime.c */
3208         return;
3209     }
3210
3211     if (start_tmp < 3600*24*365*10){
3212         rrd_set_error("the first entry to fetch should be after 1980 (%ld)",start_tmp);
3213         return;
3214     }
3215
3216     if (end_tmp < start_tmp) {
3217         rrd_set_error("start (%ld) should be less than end (%ld)",
3218                start_tmp, end_tmp);
3219         return;
3220     }
3221
3222     im->start = start_tmp;
3223     im->end = end_tmp;
3224     im->step = max((long)im->step, (im->end-im->start)/im->xsize);
3225 }
3226
3227 int
3228 rrd_graph_check_vname(image_desc_t *im, char *varname, char *err)
3229 {
3230     if ((im->gdes[im->gdes_c-1].vidx=find_var(im,varname))==-1) {
3231         rrd_set_error("Unknown variable '%s' in %s",varname,err);
3232         return -1;
3233     }
3234     return 0;
3235 }
3236 int
3237 rrd_graph_color(image_desc_t *im, char *var, char *err, int optional)
3238 {
3239     char *color;
3240     graph_desc_t *gdp=&im->gdes[im->gdes_c-1];
3241
3242     color=strstr(var,"#");
3243     if (color==NULL) {
3244         if (optional==0) {
3245             rrd_set_error("Found no color in %s",err);
3246             return 0;
3247         }
3248         return 0;
3249     } else {
3250         int n=0;
3251         char *rest;
3252         gfx_color_t    col;
3253
3254         rest=strstr(color,":");
3255         if (rest!=NULL)
3256             n=rest-color;
3257         else
3258             n=strlen(color);
3259
3260         switch (n) {
3261             case 7:
3262                 sscanf(color,"#%6lx%n",&col,&n);
3263                 col = (col << 8) + 0xff /* shift left by 8 */;
3264                 if (n!=7) rrd_set_error("Color problem in %s",err);
3265                 break;
3266             case 9:
3267                 sscanf(color,"#%8lx%n",&col,&n);
3268                 if (n==9) break;
3269             default:
3270                 rrd_set_error("Color problem in %s",err);
3271         }
3272         if (rrd_test_error()) return 0;
3273         gdp->col = col;
3274         return n;
3275     }
3276 }
3277
3278
3279 int bad_format(char *fmt) {
3280     char *ptr;
3281     int n=0;
3282     ptr = fmt;
3283     while (*ptr != '\0')
3284         if (*ptr++ == '%') {
3285
3286              /* line cannot end with percent char */
3287              if (*ptr == '\0') return 1;
3288
3289              /* '%s', '%S' and '%%' are allowed */
3290              if (*ptr == 's' || *ptr == 'S' || *ptr == '%') ptr++;
3291
3292              /* or else '% 6.2lf' and such are allowed */
3293              else {
3294
3295                  /* optional padding character */
3296                  if (*ptr == ' ' || *ptr == '+' || *ptr == '-') ptr++;
3297
3298                  /* This should take care of 'm.n' with all three optional */
3299                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3300                  if (*ptr == '.') ptr++;
3301                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3302
3303                  /* Either 'le', 'lf' or 'lg' must follow here */
3304                  if (*ptr++ != 'l') return 1;
3305                  if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g') ptr++;
3306                  else return 1;
3307                  n++;
3308             }
3309          }
3310
3311       return (n!=1);
3312 }
3313
3314
3315 int
3316 vdef_parse(gdes,str)
3317 struct graph_desc_t *gdes;
3318 char *str;
3319 {
3320     /* A VDEF currently is either "func" or "param,func"
3321      * so the parsing is rather simple.  Change if needed.
3322      */
3323     double      param;
3324     char        func[30];
3325     int         n;
3326
3327     n=0;
3328     sscanf(str,"%le,%29[A-Z]%n",&param,func,&n);
3329     if (n== (int)strlen(str)) { /* matched */
3330         ;
3331     } else {
3332         n=0;
3333         sscanf(str,"%29[A-Z]%n",func,&n);
3334         if (n== (int)strlen(str)) { /* matched */
3335             param=DNAN;
3336         } else {
3337             rrd_set_error("Unknown function string '%s' in VDEF '%s'"
3338                 ,str
3339                 ,gdes->vname
3340                 );
3341             return -1;
3342         }
3343     }
3344     if          (!strcmp("PERCENT",func)) gdes->vf.op = VDEF_PERCENT;
3345     else if     (!strcmp("MAXIMUM",func)) gdes->vf.op = VDEF_MAXIMUM;
3346     else if     (!strcmp("AVERAGE",func)) gdes->vf.op = VDEF_AVERAGE;
3347     else if     (!strcmp("MINIMUM",func)) gdes->vf.op = VDEF_MINIMUM;
3348     else if     (!strcmp("TOTAL",  func)) gdes->vf.op = VDEF_TOTAL;
3349     else if     (!strcmp("FIRST",  func)) gdes->vf.op = VDEF_FIRST;
3350     else if     (!strcmp("LAST",   func)) gdes->vf.op = VDEF_LAST;
3351     else {
3352         rrd_set_error("Unknown function '%s' in VDEF '%s'\n"
3353             ,func
3354             ,gdes->vname
3355             );
3356         return -1;
3357     };
3358
3359     switch (gdes->vf.op) {
3360         case VDEF_PERCENT:
3361             if (isnan(param)) { /* no parameter given */
3362                 rrd_set_error("Function '%s' needs parameter in VDEF '%s'\n"
3363                     ,func
3364                     ,gdes->vname
3365                     );
3366                 return -1;
3367             };
3368             if (param>=0.0 && param<=100.0) {
3369                 gdes->vf.param = param;
3370                 gdes->vf.val   = DNAN;  /* undefined */
3371                 gdes->vf.when  = 0;     /* undefined */
3372             } else {
3373                 rrd_set_error("Parameter '%f' out of range in VDEF '%s'\n"
3374                     ,param
3375                     ,gdes->vname
3376                     );
3377                 return -1;
3378             };
3379             break;
3380         case VDEF_MAXIMUM:
3381         case VDEF_AVERAGE:
3382         case VDEF_MINIMUM:
3383         case VDEF_TOTAL:
3384         case VDEF_FIRST:
3385         case VDEF_LAST:
3386             if (isnan(param)) {
3387                 gdes->vf.param = DNAN;
3388                 gdes->vf.val   = DNAN;
3389                 gdes->vf.when  = 0;
3390             } else {
3391                 rrd_set_error("Function '%s' needs no parameter in VDEF '%s'\n"
3392                     ,func
3393                     ,gdes->vname
3394                     );
3395                 return -1;
3396             };
3397             break;
3398     };
3399     return 0;
3400 }
3401
3402
3403 int
3404 vdef_calc(im,gdi)
3405 image_desc_t *im;
3406 int gdi;
3407 {
3408     graph_desc_t        *src,*dst;
3409     rrd_value_t         *data;
3410     long                step,steps;
3411
3412     dst = &im->gdes[gdi];
3413     src = &im->gdes[dst->vidx];
3414     data = src->data + src->ds;
3415     steps = (src->end - src->start) / src->step;
3416
3417 #if 0
3418 printf("DEBUG: start == %lu, end == %lu, %lu steps\n"
3419     ,src->start
3420     ,src->end
3421     ,steps
3422     );
3423 #endif
3424
3425     switch (dst->vf.op) {
3426         case VDEF_PERCENT: {
3427                 rrd_value_t *   array;
3428                 int             field;
3429
3430
3431                 if ((array = malloc(steps*sizeof(double)))==NULL) {
3432                     rrd_set_error("malloc VDEV_PERCENT");
3433                     return -1;
3434                 }
3435                 for (step=0;step < steps; step++) {
3436                     array[step]=data[step*src->ds_cnt];
3437                 }
3438                 qsort(array,step,sizeof(double),vdef_percent_compar);
3439
3440                 field = (steps-1)*dst->vf.param/100;
3441                 dst->vf.val  = array[field];
3442                 dst->vf.when = 0;       /* no time component */
3443                 free(array);
3444 #if 0
3445 for(step=0;step<steps;step++)
3446 printf("DEBUG: %3li:%10.2f %c\n",step,array[step],step==field?'*':' ');
3447 #endif
3448             }
3449             break;
3450         case VDEF_MAXIMUM:
3451             step=0;
3452             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3453             if (step == steps) {
3454                 dst->vf.val  = DNAN;
3455                 dst->vf.when = 0;
3456             } else {
3457                 dst->vf.val  = data[step*src->ds_cnt];
3458                 dst->vf.when = src->start + (step+1)*src->step;
3459             }
3460             while (step != steps) {
3461                 if (finite(data[step*src->ds_cnt])) {
3462                     if (data[step*src->ds_cnt] > dst->vf.val) {
3463                         dst->vf.val  = data[step*src->ds_cnt];
3464                         dst->vf.when = src->start + (step+1)*src->step;
3465                     }
3466                 }
3467                 step++;
3468             }
3469             break;
3470         case VDEF_TOTAL:
3471         case VDEF_AVERAGE: {
3472             int cnt=0;
3473             double sum=0.0;
3474             for (step=0;step<steps;step++) {
3475                 if (finite(data[step*src->ds_cnt])) {
3476                     sum += data[step*src->ds_cnt];
3477                     cnt ++;
3478                 };
3479             }
3480             if (cnt) {
3481                 if (dst->vf.op == VDEF_TOTAL) {
3482                     dst->vf.val  = sum*src->step;
3483                     dst->vf.when = cnt*src->step;       /* not really "when" */
3484                 } else {
3485                     dst->vf.val = sum/cnt;
3486                     dst->vf.when = 0;   /* no time component */
3487                 };
3488             } else {
3489                 dst->vf.val  = DNAN;
3490                 dst->vf.when = 0;
3491             }
3492             }
3493             break;
3494         case VDEF_MINIMUM:
3495             step=0;
3496             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3497             if (step == steps) {
3498                 dst->vf.val  = DNAN;
3499                 dst->vf.when = 0;
3500             } else {
3501                 dst->vf.val  = data[step*src->ds_cnt];
3502                 dst->vf.when = src->start + (step+1)*src->step;
3503             }
3504             while (step != steps) {
3505                 if (finite(data[step*src->ds_cnt])) {
3506                     if (data[step*src->ds_cnt] < dst->vf.val) {
3507                         dst->vf.val  = data[step*src->ds_cnt];
3508                         dst->vf.when = src->start + (step+1)*src->step;
3509                     }
3510                 }
3511                 step++;
3512             }
3513             break;
3514         case VDEF_FIRST:
3515             /* The time value returned here is one step before the
3516              * actual time value.  This is the start of the first
3517              * non-NaN interval.
3518              */
3519             step=0;
3520             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3521             if (step == steps) { /* all entries were NaN */
3522                 dst->vf.val  = DNAN;
3523                 dst->vf.when = 0;
3524             } else {
3525                 dst->vf.val  = data[step*src->ds_cnt];
3526                 dst->vf.when = src->start + step*src->step;
3527             }
3528             break;
3529         case VDEF_LAST:
3530             /* The time value returned here is the
3531              * actual time value.  This is the end of the last
3532              * non-NaN interval.
3533              */
3534             step=steps-1;
3535             while (step >= 0 && isnan(data[step*src->ds_cnt])) step--;
3536             if (step < 0) { /* all entries were NaN */
3537                 dst->vf.val  = DNAN;
3538                 dst->vf.when = 0;
3539             } else {
3540                 dst->vf.val  = data[step*src->ds_cnt];
3541                 dst->vf.when = src->start + (step+1)*src->step;
3542             }
3543             break;
3544     }
3545     return 0;
3546 }
3547
3548 /* NaN < -INF < finite_values < INF */
3549 int
3550 vdef_percent_compar(a,b)
3551 const void *a,*b;
3552 {
3553     /* Equality is not returned; this doesn't hurt except
3554      * (maybe) for a little performance.
3555      */
3556
3557     /* First catch NaN values. They are smallest */
3558     if (isnan( *(double *)a )) return -1;
3559     if (isnan( *(double *)b )) return  1;
3560
3561     /* NaN doesn't reach this part so INF and -INF are extremes.
3562      * The sign from isinf() is compatible with the sign we return
3563      */
3564     if (isinf( *(double *)a )) return isinf( *(double *)a );
3565     if (isinf( *(double *)b )) return isinf( *(double *)b );
3566
3567     /* If we reach this, both values must be finite */
3568     if ( *(double *)a < *(double *)b ) return -1; else return 1;
3569 }