src/rrd_graph.c

   1 /****************************************************************************
   2  * RRDtool 1.2.4  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] >=  2.5 * 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                   10, (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 ) | 0x00000044,
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 boxL, boxH, boxV;
1991
1992                             boxL = 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,"oo", 0);
1996                             boxH = boxL / 1.9;
1997                             boxV = boxH+1;
1998
1999                             /* make sure transparent colors show up all the same */
2000                              node = gfx_new_area(im->canvas,
2001                                                 X0-1,Y0-boxV,
2002                                                 X0-1,Y0+1,
2003                                                 X0+boxL+0.5,Y0+1,
2004                                                 im->graph_col[GRC_BACK]);
2005                             gfx_add_point ( node, X0+boxL+0.5, Y0-boxV );
2006                             node = gfx_new_area(im->canvas,
2007                                                 X0-1,Y0-boxV,
2008                                                 X0-1,Y0,
2009                                                 X0+boxH,Y0,
2010                                                 im->graph_col[GRC_CANVAS]);
2011                             gfx_add_point ( node, X0+boxH, Y0-boxV );
2012
2013                             node = gfx_new_area(im->canvas,
2014                                                 X0-1,Y0-boxV,
2015                                                 X0-1,Y0,
2016                                                 X0+boxH,Y0,
2017                                                 im->gdes[i].col);
2018                             gfx_add_point ( node, X0+boxH, Y0-boxV );
2019                             node = gfx_new_line(im->canvas,
2020                                                 X0-1,Y0-boxV,
2021                                                 X0-1,Y0,
2022                                                 1,im->graph_col[GRC_FONT]);
2023                             gfx_add_point(node,X0+boxH,Y0);
2024                             gfx_add_point(node,X0+boxH,Y0-boxV);
2025                             gfx_close_path(node);
2026                     }
2027             }
2028     }
2029 }
2030
2031
2032 /*****************************************************
2033  * lazy check make sure we rely need to create this graph
2034  *****************************************************/
2035
2036 int lazy_check(image_desc_t *im){
2037     FILE *fd = NULL;
2038         int size = 1;
2039     struct stat  imgstat;
2040
2041     if (im->lazy == 0) return 0; /* no lazy option */
2042     if (stat(im->graphfile,&imgstat) != 0)
2043       return 0; /* can't stat */
2044     /* one pixel in the existing graph is more then what we would
2045        change here ... */
2046     if (time(NULL) - imgstat.st_mtime >
2047         (im->end - im->start) / im->xsize)
2048       return 0;
2049     if ((fd = fopen(im->graphfile,"rb")) == NULL)
2050       return 0; /* the file does not exist */
2051     switch (im->canvas->imgformat) {
2052     case IF_PNG:
2053            size = PngSize(fd,&(im->ximg),&(im->yimg));
2054            break;
2055     default:
2056            size = 1;
2057     }
2058     fclose(fd);
2059     return size;
2060 }
2061
2062 #ifdef WITH_PIECHART
2063 void
2064 pie_part(image_desc_t *im, gfx_color_t color,
2065             double PieCenterX, double PieCenterY, double Radius,
2066             double startangle, double endangle)
2067 {
2068     gfx_node_t *node;
2069     double angle;
2070     double step=M_PI/50; /* Number of iterations for the circle;
2071                          ** 10 is definitely too low, more than
2072                          ** 50 seems to be overkill
2073                          */
2074
2075     /* Strange but true: we have to work clockwise or else
2076     ** anti aliasing nor transparency don't work.
2077     **
2078     ** This test is here to make sure we do it right, also
2079     ** this makes the for...next loop more easy to implement.
2080     ** The return will occur if the user enters a negative number
2081     ** (which shouldn't be done according to the specs) or if the
2082     ** programmers do something wrong (which, as we all know, never
2083     ** happens anyway :)
2084     */
2085     if (endangle<startangle) return;
2086
2087     /* Hidden feature: Radius decreases each full circle */
2088     angle=startangle;
2089     while (angle>=2*M_PI) {
2090         angle  -= 2*M_PI;
2091         Radius *= 0.8;
2092     }
2093
2094     node=gfx_new_area(im->canvas,
2095                 PieCenterX+sin(startangle)*Radius,
2096                 PieCenterY-cos(startangle)*Radius,
2097                 PieCenterX,
2098                 PieCenterY,
2099                 PieCenterX+sin(endangle)*Radius,
2100                 PieCenterY-cos(endangle)*Radius,
2101                 color);
2102     for (angle=endangle;angle-startangle>=step;angle-=step) {
2103         gfx_add_point(node,
2104                 PieCenterX+sin(angle)*Radius,
2105                 PieCenterY-cos(angle)*Radius );
2106     }
2107 }
2108
2109 #endif
2110
2111 int
2112 graph_size_location(image_desc_t *im, int elements
2113
2114 #ifdef WITH_PIECHART
2115 , int piechart
2116 #endif
2117
2118  )
2119 {
2120     /* The actual size of the image to draw is determined from
2121     ** several sources.  The size given on the command line is
2122     ** the graph area but we need more as we have to draw labels
2123     ** and other things outside the graph area
2124     */
2125
2126     /* +-+-------------------------------------------+
2127     ** |l|.................title.....................|
2128     ** |e+--+-------------------------------+--------+
2129     ** |b| b|                               |        |
2130     ** |a| a|                               |  pie   |
2131     ** |l| l|          main graph area      | chart  |
2132     ** |.| .|                               |  area  |
2133     ** |t| y|                               |        |
2134     ** |r+--+-------------------------------+--------+
2135     ** |e|  | x-axis labels                 |        |
2136     ** |v+--+-------------------------------+--------+
2137     ** | |..............legends......................|
2138     ** +-+-------------------------------------------+
2139     */
2140     int Xvertical=0,
2141                         Ytitle   =0,
2142         Xylabel  =0,
2143         Xmain    =0,    Ymain    =0,
2144 #ifdef WITH_PIECHART
2145         Xpie     =0,    Ypie     =0,
2146 #endif
2147                         Yxlabel  =0,
2148 #if 0
2149         Xlegend  =0,    Ylegend  =0,
2150 #endif
2151         Xspacing =15,  Yspacing =15;
2152
2153     if (im->extra_flags & ONLY_GRAPH) {
2154         im->xorigin =0;
2155         im->ximg = im->xsize;
2156         im->yimg = im->ysize;
2157         im->yorigin = im->ysize;
2158         return 0;
2159     }
2160
2161     if (im->ylegend[0] != '\0' ) {
2162            Xvertical = im->text_prop[TEXT_PROP_UNIT].size *2;
2163     }
2164
2165
2166     if (im->title[0] != '\0') {
2167         /* The title is placed "inbetween" two text lines so it
2168         ** automatically has some vertical spacing.  The horizontal
2169         ** spacing is added here, on each side.
2170         */
2171         /* don't care for the with of the title
2172                 Xtitle = gfx_get_text_width(im->canvas, 0,
2173                 im->text_prop[TEXT_PROP_TITLE].font,
2174                 im->text_prop[TEXT_PROP_TITLE].size,
2175                 im->tabwidth,
2176                 im->title, 0) + 2*Xspacing; */
2177         Ytitle = im->text_prop[TEXT_PROP_TITLE].size*2.6+10;
2178     }
2179
2180     if (elements) {
2181         Xmain=im->xsize;
2182         Ymain=im->ysize;
2183         if (im->draw_x_grid) {
2184             Yxlabel=im->text_prop[TEXT_PROP_AXIS].size *2.5;
2185         }
2186         if (im->draw_y_grid) {
2187             Xylabel=gfx_get_text_width(im->canvas, 0,
2188                         im->text_prop[TEXT_PROP_AXIS].font,
2189                         im->text_prop[TEXT_PROP_AXIS].size,
2190                         im->tabwidth,
2191                         "0", 0) * im->unitslength;
2192         }
2193     }
2194
2195 #ifdef WITH_PIECHART
2196     if (piechart) {
2197         im->piesize=im->xsize<im->ysize?im->xsize:im->ysize;
2198         Xpie=im->piesize;
2199         Ypie=im->piesize;
2200     }
2201 #endif
2202
2203     /* Now calculate the total size.  Insert some spacing where
2204        desired.  im->xorigin and im->yorigin need to correspond
2205        with the lower left corner of the main graph area or, if
2206        this one is not set, the imaginary box surrounding the
2207        pie chart area. */
2208
2209     /* The legend width cannot yet be determined, as a result we
2210     ** have problems adjusting the image to it.  For now, we just
2211     ** forget about it at all; the legend will have to fit in the
2212     ** size already allocated.
2213     */
2214     im->ximg = Xylabel + Xmain + 2 * Xspacing;
2215
2216 #ifdef WITH_PIECHART
2217     im->ximg  += Xpie;
2218 #endif
2219
2220     if (Xmain) im->ximg += Xspacing;
2221 #ifdef WITH_PIECHART
2222     if (Xpie) im->ximg += Xspacing;
2223 #endif
2224
2225     im->xorigin = Xspacing + Xylabel;
2226
2227     /* the length of the title should not influence with width of the graph
2228        if (Xtitle > im->ximg) im->ximg = Xtitle; */
2229
2230     if (Xvertical) { /* unit description */
2231         im->ximg += Xvertical;
2232         im->xorigin += Xvertical;
2233     }
2234     xtr(im,0);
2235
2236     /* The vertical size is interesting... we need to compare
2237     ** the sum of {Ytitle, Ymain, Yxlabel, Ylegend} with Yvertical
2238     ** however we need to know {Ytitle+Ymain+Yxlabel} in order to
2239     ** start even thinking about Ylegend.
2240     **
2241     ** Do it in three portions: First calculate the inner part,
2242     ** then do the legend, then adjust the total height of the img.
2243     */
2244
2245     /* reserve space for main and/or pie */
2246
2247     im->yimg = Ymain + Yxlabel;
2248
2249 #ifdef WITH_PIECHART
2250     if (im->yimg < Ypie) im->yimg = Ypie;
2251 #endif
2252
2253     im->yorigin = im->yimg - Yxlabel;
2254
2255     /* reserve space for the title *or* some padding above the graph */
2256     if (Ytitle) {
2257         im->yimg += Ytitle;
2258         im->yorigin += Ytitle;
2259     } else {
2260         im->yimg += 1.5*Yspacing;
2261         im->yorigin += 1.5*Yspacing;
2262     }
2263     /* reserve space for padding below the graph */
2264     im->yimg += Yspacing;
2265     ytr(im,DNAN);
2266
2267     /* Determine where to place the legends onto the image.
2268     ** Adjust im->yimg to match the space requirements.
2269     */
2270     if(leg_place(im)==-1)
2271         return -1;
2272
2273
2274 #if 0
2275     if (Xlegend > im->ximg) {
2276         im->ximg = Xlegend;
2277         /* reposition Pie */
2278     }
2279 #endif
2280
2281 #ifdef WITH_PIECHART
2282     /* The pie is placed in the upper right hand corner,
2283     ** just below the title (if any) and with sufficient
2284     ** padding.
2285     */
2286     if (elements) {
2287         im->pie_x = im->ximg - Xspacing - Xpie/2;
2288         im->pie_y = im->yorigin-Ymain+Ypie/2;
2289     } else {
2290         im->pie_x = im->ximg/2;
2291         im->pie_y = im->yorigin-Ypie/2;
2292     }
2293 #endif
2294
2295     return 0;
2296 }
2297
2298 /* draw that picture thing ... */
2299 int
2300 graph_paint(image_desc_t *im, char ***calcpr)
2301 {
2302   int i,ii;
2303   int lazy =     lazy_check(im);
2304 #ifdef WITH_PIECHART
2305   int piechart = 0;
2306   double PieStart=0.0;
2307 #endif
2308   FILE  *fo;
2309   gfx_node_t *node;
2310
2311   double areazero = 0.0;
2312   enum gf_en stack_gf = GF_PRINT;
2313   graph_desc_t *lastgdes = NULL;
2314
2315   /* if we are lazy and there is nothing to PRINT ... quit now */
2316   if (lazy && im->prt_c==0) return 0;
2317
2318   /* pull the data from the rrd files ... */
2319
2320   if(data_fetch(im)==-1)
2321     return -1;
2322
2323   /* evaluate VDEF and CDEF operations ... */
2324   if(data_calc(im)==-1)
2325     return -1;
2326
2327 #ifdef WITH_PIECHART
2328   /* check if we need to draw a piechart */
2329   for(i=0;i<im->gdes_c;i++){
2330     if (im->gdes[i].gf == GF_PART) {
2331       piechart=1;
2332       break;
2333     }
2334   }
2335 #endif
2336
2337   /* calculate and PRINT and GPRINT definitions. We have to do it at
2338    * this point because it will affect the length of the legends
2339    * if there are no graph elements we stop here ...
2340    * if we are lazy, try to quit ...
2341    */
2342   i=print_calc(im,calcpr);
2343   if(i<0) return -1;
2344   if(((i==0)
2345 #ifdef WITH_PIECHART
2346 &&(piechart==0)
2347 #endif
2348 ) || lazy) return 0;
2349
2350 #ifdef WITH_PIECHART
2351   /* If there's only the pie chart to draw, signal this */
2352   if (i==0) piechart=2;
2353 #endif
2354
2355   /* get actual drawing data and find min and max values*/
2356   if(data_proc(im)==-1)
2357     return -1;
2358
2359   if(!im->logarithmic){si_unit(im);}        /* identify si magnitude Kilo, Mega Giga ? */
2360
2361   if(!im->rigid && ! im->logarithmic)
2362     expand_range(im);   /* make sure the upper and lower limit are
2363                            sensible values */
2364
2365   if (!calc_horizontal_grid(im))
2366     return -1;
2367
2368   if (im->gridfit)
2369     apply_gridfit(im);
2370
2371
2372 /**************************************************************
2373  *** Calculating sizes and locations became a bit confusing ***
2374  *** so I moved this into a separate function.              ***
2375  **************************************************************/
2376   if(graph_size_location(im,i
2377 #ifdef WITH_PIECHART
2378 ,piechart
2379 #endif
2380 )==-1)
2381     return -1;
2382
2383   /* the actual graph is created by going through the individual
2384      graph elements and then drawing them */
2385
2386   node=gfx_new_area ( im->canvas,
2387                       0, 0,
2388                       im->ximg, 0,
2389                       im->ximg, im->yimg,
2390                       im->graph_col[GRC_BACK]);
2391
2392   gfx_add_point(node,0, im->yimg);
2393
2394 #ifdef WITH_PIECHART
2395   if (piechart != 2) {
2396 #endif
2397     node=gfx_new_area ( im->canvas,
2398                       im->xorigin,             im->yorigin,
2399                       im->xorigin + im->xsize, im->yorigin,
2400                       im->xorigin + im->xsize, im->yorigin-im->ysize,
2401                       im->graph_col[GRC_CANVAS]);
2402
2403     gfx_add_point(node,im->xorigin, im->yorigin - im->ysize);
2404
2405     if (im->minval > 0.0)
2406       areazero = im->minval;
2407     if (im->maxval < 0.0)
2408       areazero = im->maxval;
2409 #ifdef WITH_PIECHART
2410    }
2411 #endif
2412
2413 #ifdef WITH_PIECHART
2414   if (piechart) {
2415     pie_part(im,im->graph_col[GRC_CANVAS],im->pie_x,im->pie_y,im->piesize*0.5,0,2*M_PI);
2416   }
2417 #endif
2418
2419   for(i=0;i<im->gdes_c;i++){
2420     switch(im->gdes[i].gf){
2421     case GF_CDEF:
2422     case GF_VDEF:
2423     case GF_DEF:
2424     case GF_PRINT:
2425     case GF_GPRINT:
2426     case GF_COMMENT:
2427     case GF_HRULE:
2428     case GF_VRULE:
2429     case GF_XPORT:
2430     case GF_SHIFT:
2431       break;
2432     case GF_TICK:
2433       for (ii = 0; ii < im->xsize; ii++)
2434         {
2435           if (!isnan(im->gdes[i].p_data[ii]) &&
2436               im->gdes[i].p_data[ii] > 0.0)
2437             {
2438               /* generate a tick */
2439               gfx_new_line(im->canvas, im -> xorigin + ii,
2440                            im -> yorigin - (im -> gdes[i].yrule * im -> ysize),
2441                            im -> xorigin + ii,
2442                            im -> yorigin,
2443                            1.0,
2444                            im -> gdes[i].col );
2445             }
2446         }
2447       break;
2448     case GF_LINE:
2449     case GF_AREA:
2450       stack_gf = im->gdes[i].gf;
2451     case GF_STACK:
2452       /* fix data points at oo and -oo */
2453       for(ii=0;ii<im->xsize;ii++){
2454         if (isinf(im->gdes[i].p_data[ii])){
2455           if (im->gdes[i].p_data[ii] > 0) {
2456             im->gdes[i].p_data[ii] = im->maxval ;
2457           } else {
2458             im->gdes[i].p_data[ii] = im->minval ;
2459           }
2460
2461         }
2462       } /* for */
2463
2464       /* *******************************************************
2465        a           ___. (a,t)
2466                   |   |    ___
2467               ____|   |   |   |
2468               |       |___|
2469        -------|--t-1--t--------------------------------
2470
2471       if we know the value at time t was a then
2472       we draw a square from t-1 to t with the value a.
2473
2474       ********************************************************* */
2475       if (im->gdes[i].col != 0x0){
2476         /* GF_LINE and friend */
2477         if(stack_gf == GF_LINE ){
2478           node = NULL;
2479           for(ii=1;ii<im->xsize;ii++){
2480             if (isnan(im->gdes[i].p_data[ii]) || (im->slopemode==1 && isnan(im->gdes[i].p_data[ii-1]))){
2481                 node = NULL;
2482                 continue;
2483             }
2484             if ( node == NULL ) {
2485                 if ( im->slopemode == 0 ){
2486                   node = gfx_new_line(im->canvas,
2487                                     ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2488                                     ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2489                                     im->gdes[i].linewidth,
2490                                     im->gdes[i].col);
2491                 } else {
2492                   node = gfx_new_line(im->canvas,
2493                                     ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii-1]),
2494                                     ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2495                                     im->gdes[i].linewidth,
2496                                     im->gdes[i].col);
2497                 }
2498              } else {
2499                if ( im->slopemode==0 ){
2500                    gfx_add_point(node,ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2501                };
2502                gfx_add_point(node,ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2503              };
2504
2505           }
2506         } else {
2507           float ybase0 = DNAN,ytop0=DNAN;
2508           for(ii=0;ii<im->xsize;ii++){
2509             /* keep things simple for now, just draw these bars
2510                do not try to build a big and complex area */
2511             float ybase,ytop;
2512             if ( im->slopemode == 0 && ii==0){
2513                 continue;
2514             }
2515             if ( isnan(im->gdes[i].p_data[ii]) ) {
2516                 ybase0 = DNAN;
2517                 continue;
2518             }
2519             ytop = ytr(im,im->gdes[i].p_data[ii]);
2520             if ( lastgdes && im->gdes[i].stack ) {
2521                   ybase = ytr(im,lastgdes->p_data[ii]);
2522             } else {
2523                   ybase = ytr(im,areazero);
2524             }
2525             if ( ybase == ytop ){
2526                 ybase0 = DNAN;
2527                 continue;
2528             }
2529             /* every area has to be wound clock-wise,
2530                so we have to make sur base remains base  */
2531             if (ybase > ytop){
2532                 float extra = ytop;
2533                 ytop = ybase;
2534                 ybase = extra;
2535             }
2536             if ( im->slopemode == 0){
2537                  ybase0 = ybase;
2538                  ytop0 = ytop;
2539             }
2540             if ( !isnan(ybase0) ){
2541                     node = gfx_new_area(im->canvas,
2542                                 ii-1+im->xorigin,ybase0,
2543                                 ii-1+im->xorigin,ytop0,
2544                                 ii+im->xorigin,ytop,
2545                                 im->gdes[i].col
2546                                );
2547                     gfx_add_point(node,
2548                                 ii+im->xorigin,ybase
2549                               );
2550             }
2551             ybase0=ybase;
2552             ytop0=ytop;
2553           }
2554         } /* else GF_LINE */
2555       } /* if color != 0x0 */
2556       /* make sure we do not run into trouble when stacking on NaN */
2557       for(ii=0;ii<im->xsize;ii++){
2558         if (isnan(im->gdes[i].p_data[ii])) {
2559           if (lastgdes && (im->gdes[i].stack)) {
2560             im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
2561           } else {
2562             im->gdes[i].p_data[ii] =  ytr(im,areazero);
2563           }
2564         }
2565       }
2566       lastgdes = &(im->gdes[i]);
2567       break;
2568 #ifdef WITH_PIECHART
2569     case GF_PART:
2570       if(isnan(im->gdes[i].yrule)) /* fetch variable */
2571         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2572
2573       if (finite(im->gdes[i].yrule)) {  /* even the fetched var can be NaN */
2574         pie_part(im,im->gdes[i].col,
2575                 im->pie_x,im->pie_y,im->piesize*0.4,
2576                 M_PI*2.0*PieStart/100.0,
2577                 M_PI*2.0*(PieStart+im->gdes[i].yrule)/100.0);
2578         PieStart += im->gdes[i].yrule;
2579       }
2580       break;
2581 #endif
2582
2583     } /* switch */
2584   }
2585 #ifdef WITH_PIECHART
2586   if (piechart==2) {
2587     im->draw_x_grid=0;
2588     im->draw_y_grid=0;
2589   }
2590 #endif
2591
2592
2593   /* grid_paint also does the text */
2594   if( !(im->extra_flags & ONLY_GRAPH) )
2595     grid_paint(im);
2596
2597
2598   if( !(im->extra_flags & ONLY_GRAPH) )
2599       axis_paint(im);
2600
2601   /* the RULES are the last thing to paint ... */
2602   for(i=0;i<im->gdes_c;i++){
2603
2604     switch(im->gdes[i].gf){
2605     case GF_HRULE:
2606       if(isnan(im->gdes[i].yrule)) { /* fetch variable */
2607         im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2608       };
2609       if(im->gdes[i].yrule >= im->minval
2610          && im->gdes[i].yrule <= im->maxval)
2611         gfx_new_line(im->canvas,
2612                      im->xorigin,ytr(im,im->gdes[i].yrule),
2613                      im->xorigin+im->xsize,ytr(im,im->gdes[i].yrule),
2614                      1.0,im->gdes[i].col);
2615       break;
2616     case GF_VRULE:
2617       if(im->gdes[i].xrule == 0) { /* fetch variable */
2618         im->gdes[i].xrule = im->gdes[im->gdes[i].vidx].vf.when;
2619       };
2620       if(im->gdes[i].xrule >= im->start
2621          && im->gdes[i].xrule <= im->end)
2622         gfx_new_line(im->canvas,
2623                      xtr(im,im->gdes[i].xrule),im->yorigin,
2624                      xtr(im,im->gdes[i].xrule),im->yorigin-im->ysize,
2625                      1.0,im->gdes[i].col);
2626       break;
2627     default:
2628       break;
2629     }
2630   }
2631
2632
2633   if (strcmp(im->graphfile,"-")==0) {
2634     fo = im->graphhandle ? im->graphhandle : stdout;
2635 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2636     /* Change translation mode for stdout to BINARY */
2637     _setmode( _fileno( fo ), O_BINARY );
2638 #endif
2639   } else {
2640     if ((fo = fopen(im->graphfile,"wb")) == NULL) {
2641       rrd_set_error("Opening '%s' for write: %s",im->graphfile,
2642                     rrd_strerror(errno));
2643       return (-1);
2644     }
2645   }
2646   gfx_render (im->canvas,im->ximg,im->yimg,0x0,fo);
2647   if (strcmp(im->graphfile,"-") != 0)
2648     fclose(fo);
2649   return 0;
2650 }
2651
2652
2653 /*****************************************************
2654  * graph stuff
2655  *****************************************************/
2656
2657 int
2658 gdes_alloc(image_desc_t *im){
2659
2660     im->gdes_c++;
2661     if ((im->gdes = (graph_desc_t *) rrd_realloc(im->gdes, (im->gdes_c)
2662                                            * sizeof(graph_desc_t)))==NULL){
2663         rrd_set_error("realloc graph_descs");
2664         return -1;
2665     }
2666
2667
2668     im->gdes[im->gdes_c-1].step=im->step;
2669     im->gdes[im->gdes_c-1].stack=0;
2670     im->gdes[im->gdes_c-1].debug=0;
2671     im->gdes[im->gdes_c-1].start=im->start;
2672     im->gdes[im->gdes_c-1].end=im->end;
2673     im->gdes[im->gdes_c-1].vname[0]='\0';
2674     im->gdes[im->gdes_c-1].data=NULL;
2675     im->gdes[im->gdes_c-1].ds_namv=NULL;
2676     im->gdes[im->gdes_c-1].data_first=0;
2677     im->gdes[im->gdes_c-1].p_data=NULL;
2678     im->gdes[im->gdes_c-1].rpnp=NULL;
2679     im->gdes[im->gdes_c-1].shift=0;
2680     im->gdes[im->gdes_c-1].col = 0x0;
2681     im->gdes[im->gdes_c-1].legend[0]='\0';
2682     im->gdes[im->gdes_c-1].format[0]='\0';
2683     im->gdes[im->gdes_c-1].rrd[0]='\0';
2684     im->gdes[im->gdes_c-1].ds=-1;
2685     im->gdes[im->gdes_c-1].p_data=NULL;
2686     im->gdes[im->gdes_c-1].yrule=DNAN;
2687     im->gdes[im->gdes_c-1].xrule=0;
2688     return 0;
2689 }
2690
2691 /* copies input untill the first unescaped colon is found
2692    or until input ends. backslashes have to be escaped as well */
2693 int
2694 scan_for_col(char *input, int len, char *output)
2695 {
2696     int inp,outp=0;
2697     for (inp=0;
2698          inp < len &&
2699            input[inp] != ':' &&
2700            input[inp] != '\0';
2701          inp++){
2702       if (input[inp] == '\\' &&
2703           input[inp+1] != '\0' &&
2704           (input[inp+1] == '\\' ||
2705            input[inp+1] == ':')){
2706         output[outp++] = input[++inp];
2707       }
2708       else {
2709         output[outp++] = input[inp];
2710       }
2711     }
2712     output[outp] = '\0';
2713     return inp;
2714 }
2715 /* Some surgery done on this function, it became ridiculously big.
2716 ** Things moved:
2717 ** - initializing     now in rrd_graph_init()
2718 ** - options parsing  now in rrd_graph_options()
2719 ** - script parsing   now in rrd_graph_script()
2720 */
2721 int
2722 rrd_graph(int argc, char **argv, char ***prdata, int *xsize, int *ysize, FILE *stream, double *ymin, double *ymax)
2723 {
2724     image_desc_t   im;
2725     rrd_graph_init(&im);
2726     im.graphhandle = stream;
2727
2728     rrd_graph_options(argc,argv,&im);
2729     if (rrd_test_error()) {
2730         im_free(&im);
2731         return -1;
2732     }
2733
2734     if (strlen(argv[optind])>=MAXPATH) {
2735         rrd_set_error("filename (including path) too long");
2736         im_free(&im);
2737         return -1;
2738     }
2739     strncpy(im.graphfile,argv[optind],MAXPATH-1);
2740     im.graphfile[MAXPATH-1]='\0';
2741
2742     rrd_graph_script(argc,argv,&im,1);
2743     if (rrd_test_error()) {
2744         im_free(&im);
2745         return -1;
2746     }
2747
2748     /* Everything is now read and the actual work can start */
2749
2750     (*prdata)=NULL;
2751     if (graph_paint(&im,prdata)==-1){
2752         im_free(&im);
2753         return -1;
2754     }
2755
2756     /* The image is generated and needs to be output.
2757     ** Also, if needed, print a line with information about the image.
2758     */
2759
2760     *xsize=im.ximg;
2761     *ysize=im.yimg;
2762     *ymin=im.minval;
2763     *ymax=im.maxval;
2764     if (im.imginfo) {
2765         char *filename;
2766         if (!(*prdata)) {
2767             /* maybe prdata is not allocated yet ... lets do it now */
2768             if ((*prdata = calloc(2,sizeof(char *)))==NULL) {
2769                 rrd_set_error("malloc imginfo");
2770                 return -1;
2771             };
2772         }
2773         if(((*prdata)[0] = malloc((strlen(im.imginfo)+200+strlen(im.graphfile))*sizeof(char)))
2774          ==NULL){
2775             rrd_set_error("malloc imginfo");
2776             return -1;
2777         }
2778         filename=im.graphfile+strlen(im.graphfile);
2779         while(filename > im.graphfile) {
2780             if (*(filename-1)=='/' || *(filename-1)=='\\' ) break;
2781             filename--;
2782         }
2783
2784         sprintf((*prdata)[0],im.imginfo,filename,(long)(im.canvas->zoom*im.ximg),(long)(im.canvas->zoom*im.yimg));
2785     }
2786     im_free(&im);
2787     return 0;
2788 }
2789
2790 void
2791 rrd_graph_init(image_desc_t *im)
2792 {
2793     unsigned int i;
2794
2795 #ifdef HAVE_TZSET
2796     tzset();
2797 #endif
2798 #ifdef HAVE_SETLOCALE
2799     setlocale(LC_TIME,"");
2800 #endif
2801     im->yorigin=0;
2802     im->xorigin=0;
2803     im->minval=0;
2804     im->xlab_user.minsec = -1;
2805     im->ximg=0;
2806     im->yimg=0;
2807     im->xsize = 400;
2808     im->ysize = 100;
2809     im->step = 0;
2810     im->ylegend[0] = '\0';
2811     im->title[0] = '\0';
2812     im->minval = DNAN;
2813     im->maxval = DNAN;
2814     im->unitsexponent= 9999;
2815     im->unitslength= 6;
2816     im->symbol = ' ';
2817     im->viewfactor = 1.0;
2818     im->extra_flags= 0;
2819     im->rigid = 0;
2820     im->gridfit = 1;
2821     im->imginfo = NULL;
2822     im->lazy = 0;
2823     im->slopemode = 0;
2824     im->logarithmic = 0;
2825     im->ygridstep = DNAN;
2826     im->draw_x_grid = 1;
2827     im->draw_y_grid = 1;
2828     im->base = 1000;
2829     im->prt_c = 0;
2830     im->gdes_c = 0;
2831     im->gdes = NULL;
2832     im->canvas = gfx_new_canvas();
2833     im->grid_dash_on = 1;
2834     im->grid_dash_off = 1;
2835     im->tabwidth = 40.0;
2836
2837     for(i=0;i<DIM(graph_col);i++)
2838         im->graph_col[i]=graph_col[i];
2839
2840 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2841     {
2842             char *windir;
2843             char rrd_win_default_font[1000];
2844             windir = getenv("windir");
2845             /* %windir% is something like D:\windows or C:\winnt */
2846             if (windir != NULL) {
2847                     strncpy(rrd_win_default_font,windir,999);
2848                     rrd_win_default_font[999] = '\0';
2849                     strcat(rrd_win_default_font,"\\fonts\\");
2850                     strcat(rrd_win_default_font,RRD_DEFAULT_FONT);
2851                     for(i=0;i<DIM(text_prop);i++){
2852                             strncpy(text_prop[i].font,rrd_win_default_font,sizeof(text_prop[i].font)-1);
2853                             text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2854                      }
2855              }
2856     }
2857 #endif
2858     {
2859             char *deffont;
2860             deffont = getenv("RRD_DEFAULT_FONT");
2861             if (deffont != NULL) {
2862                  for(i=0;i<DIM(text_prop);i++){
2863                         strncpy(text_prop[i].font,deffont,sizeof(text_prop[i].font)-1);
2864                         text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2865                  }
2866             }
2867     }
2868     for(i=0;i<DIM(text_prop);i++){
2869       im->text_prop[i].size = text_prop[i].size;
2870       strcpy(im->text_prop[i].font,text_prop[i].font);
2871     }
2872 }
2873
2874 void
2875 rrd_graph_options(int argc, char *argv[],image_desc_t *im)
2876 {
2877     int                 stroff;
2878     char                *parsetime_error = NULL;
2879     char                scan_gtm[12],scan_mtm[12],scan_ltm[12],col_nam[12];
2880     time_t              start_tmp=0,end_tmp=0;
2881     long                long_tmp;
2882     struct rrd_time_value       start_tv, end_tv;
2883     gfx_color_t         color;
2884     optind = 0; opterr = 0;  /* initialize getopt */
2885
2886     parsetime("end-24h", &start_tv);
2887     parsetime("now", &end_tv);
2888
2889     while (1){
2890         static struct option long_options[] =
2891         {
2892             {"start",      required_argument, 0,  's'},
2893             {"end",        required_argument, 0,  'e'},
2894             {"x-grid",     required_argument, 0,  'x'},
2895             {"y-grid",     required_argument, 0,  'y'},
2896             {"vertical-label",required_argument,0,'v'},
2897             {"width",      required_argument, 0,  'w'},
2898             {"height",     required_argument, 0,  'h'},
2899             {"interlaced", no_argument,       0,  'i'},
2900             {"upper-limit",required_argument, 0,  'u'},
2901             {"lower-limit",required_argument, 0,  'l'},
2902             {"rigid",      no_argument,       0,  'r'},
2903             {"base",       required_argument, 0,  'b'},
2904             {"logarithmic",no_argument,       0,  'o'},
2905             {"color",      required_argument, 0,  'c'},
2906             {"font",       required_argument, 0,  'n'},
2907             {"title",      required_argument, 0,  't'},
2908             {"imginfo",    required_argument, 0,  'f'},
2909             {"imgformat",  required_argument, 0,  'a'},
2910             {"lazy",       no_argument,       0,  'z'},
2911             {"zoom",       required_argument, 0,  'm'},
2912             {"no-legend",  no_argument,       0,  'g'},
2913             {"force-rules-legend",no_argument,0,  'F'},
2914             {"only-graph", no_argument,       0,  'j'},
2915             {"alt-y-grid", no_argument,       0,  'Y'},
2916             {"no-minor",   no_argument,       0,  'I'},
2917             {"slope-mode", no_argument,       0,  'E'},
2918             {"alt-autoscale", no_argument,    0,  'A'},
2919             {"alt-autoscale-max", no_argument, 0, 'M'},
2920             {"no-gridfit", no_argument,       0,   'N'},
2921             {"units-exponent",required_argument, 0, 'X'},
2922             {"units-length",required_argument, 0, 'L'},
2923             {"step",       required_argument, 0,    'S'},
2924             {"tabwidth",   required_argument, 0,    'T'},
2925             {"font-render-mode", required_argument, 0, 'R'},
2926             {"font-smoothing-threshold", required_argument, 0, 'B'},
2927             {0,0,0,0}};
2928         int option_index = 0;
2929         int opt;
2930         int col_start,col_end;
2931
2932         opt = getopt_long(argc, argv,
2933                          "s:e:x:y:v:w:h:iu:l:rb:oc:n:m:t:f:a:I:zgjFYAMEX:L:S:T:NR:B:",
2934                           long_options, &option_index);
2935
2936         if (opt == EOF)
2937             break;
2938
2939         switch(opt) {
2940         case 'I':
2941             im->extra_flags |= NOMINOR;
2942             break;
2943         case 'Y':
2944             im->extra_flags |= ALTYGRID;
2945             break;
2946         case 'A':
2947             im->extra_flags |= ALTAUTOSCALE;
2948             break;
2949         case 'M':
2950             im->extra_flags |= ALTAUTOSCALE_MAX;
2951             break;
2952         case 'j':
2953            im->extra_flags |= ONLY_GRAPH;
2954            break;
2955         case 'g':
2956             im->extra_flags |= NOLEGEND;
2957             break;
2958         case 'F':
2959             im->extra_flags |= FORCE_RULES_LEGEND;
2960             break;
2961         case 'X':
2962             im->unitsexponent = atoi(optarg);
2963             break;
2964         case 'L':
2965             im->unitslength = atoi(optarg);
2966             break;
2967         case 'T':
2968             im->tabwidth = atof(optarg);
2969             break;
2970         case 'S':
2971             im->step =  atoi(optarg);
2972             break;
2973         case 'N':
2974             im->gridfit = 0;
2975             break;
2976         case 's':
2977             if ((parsetime_error = parsetime(optarg, &start_tv))) {
2978                 rrd_set_error( "start time: %s", parsetime_error );
2979                 return;
2980             }
2981             break;
2982         case 'e':
2983             if ((parsetime_error = parsetime(optarg, &end_tv))) {
2984                 rrd_set_error( "end time: %s", parsetime_error );
2985                 return;
2986             }
2987             break;
2988         case 'x':
2989             if(strcmp(optarg,"none") == 0){
2990               im->draw_x_grid=0;
2991               break;
2992             };
2993
2994             if(sscanf(optarg,
2995                       "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
2996                       scan_gtm,
2997                       &im->xlab_user.gridst,
2998                       scan_mtm,
2999                       &im->xlab_user.mgridst,
3000                       scan_ltm,
3001                       &im->xlab_user.labst,
3002                       &im->xlab_user.precis,
3003                       &stroff) == 7 && stroff != 0){
3004                 strncpy(im->xlab_form, optarg+stroff, sizeof(im->xlab_form) - 1);
3005                 im->xlab_form[sizeof(im->xlab_form)-1] = '\0';
3006                 if((int)(im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1){
3007                     rrd_set_error("unknown keyword %s",scan_gtm);
3008                     return;
3009                 } else if ((int)(im->xlab_user.mgridtm = tmt_conv(scan_mtm)) == -1){
3010                     rrd_set_error("unknown keyword %s",scan_mtm);
3011                     return;
3012                 } else if ((int)(im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1){
3013                     rrd_set_error("unknown keyword %s",scan_ltm);
3014                     return;
3015                 }
3016                 im->xlab_user.minsec = 1;
3017                 im->xlab_user.stst = im->xlab_form;
3018             } else {
3019                 rrd_set_error("invalid x-grid format");
3020                 return;
3021             }
3022             break;
3023         case 'y':
3024
3025             if(strcmp(optarg,"none") == 0){
3026               im->draw_y_grid=0;
3027               break;
3028             };
3029
3030             if(sscanf(optarg,
3031                       "%lf:%d",
3032                       &im->ygridstep,
3033                       &im->ylabfact) == 2) {
3034                 if(im->ygridstep<=0){
3035                     rrd_set_error("grid step must be > 0");
3036                     return;
3037                 } else if (im->ylabfact < 1){
3038                     rrd_set_error("label factor must be > 0");
3039                     return;
3040                 }
3041             } else {
3042                 rrd_set_error("invalid y-grid format");
3043                 return;
3044             }
3045             break;
3046         case 'v':
3047             strncpy(im->ylegend,optarg,150);
3048             im->ylegend[150]='\0';
3049             break;
3050         case 'u':
3051             im->maxval = atof(optarg);
3052             break;
3053         case 'l':
3054             im->minval = atof(optarg);
3055             break;
3056         case 'b':
3057             im->base = atol(optarg);
3058             if(im->base != 1024 && im->base != 1000 ){
3059                 rrd_set_error("the only sensible value for base apart from 1000 is 1024");
3060                 return;
3061             }
3062             break;
3063         case 'w':
3064             long_tmp = atol(optarg);
3065             if (long_tmp < 10) {
3066                 rrd_set_error("width below 10 pixels");
3067                 return;
3068             }
3069             im->xsize = long_tmp;
3070             break;
3071         case 'h':
3072             long_tmp = atol(optarg);
3073             if (long_tmp < 10) {
3074                 rrd_set_error("height below 10 pixels");
3075                 return;
3076             }
3077             im->ysize = long_tmp;
3078             break;
3079         case 'i':
3080             im->canvas->interlaced = 1;
3081             break;
3082         case 'r':
3083             im->rigid = 1;
3084             break;
3085         case 'f':
3086             im->imginfo = optarg;
3087             break;
3088         case 'a':
3089             if((int)(im->canvas->imgformat = if_conv(optarg)) == -1) {
3090                 rrd_set_error("unsupported graphics format '%s'",optarg);
3091                 return;
3092             }
3093             break;
3094         case 'z':
3095             im->lazy = 1;
3096             break;
3097         case 'E':
3098             im->slopemode = 1;
3099             break;
3100
3101         case 'o':
3102             im->logarithmic = 1;
3103             if (isnan(im->minval))
3104                 im->minval=1;
3105             break;
3106         case 'c':
3107             if(sscanf(optarg,
3108                       "%10[A-Z]#%n%8lx%n",
3109                       col_nam,&col_start,&color,&col_end) == 2){
3110                 int ci;
3111                 int col_len = col_end - col_start;
3112                 switch (col_len){
3113                         case 6:
3114                                 color = (color << 8) + 0xff /* shift left by 8 */;
3115                                 break;
3116                         case 8:
3117                                 break;
3118                         default:
3119                                 rrd_set_error("the color format is #RRGGBB[AA]");
3120                                 return;
3121                 }
3122                 if((ci=grc_conv(col_nam)) != -1){
3123                     im->graph_col[ci]=color;
3124                 }  else {
3125                   rrd_set_error("invalid color name '%s'",col_nam);
3126                   return;
3127                 }
3128             } else {
3129                 rrd_set_error("invalid color def format");
3130                 return;
3131             }
3132             break;
3133         case 'n':{
3134             char prop[15];
3135             double size = 1;
3136             char font[1024];
3137
3138             if(sscanf(optarg,
3139                                 "%10[A-Z]:%lf:%1000s",
3140                                 prop,&size,font) == 3){
3141                 int sindex;
3142                 if((sindex=text_prop_conv(prop)) != -1){
3143                     im->text_prop[sindex].size=size;
3144                     strcpy(im->text_prop[sindex].font,font);
3145                     if (sindex==0) { /* the default */
3146                         im->text_prop[TEXT_PROP_TITLE].size=size;
3147                         strcpy(im->text_prop[TEXT_PROP_TITLE].font,font);
3148                         im->text_prop[TEXT_PROP_AXIS].size=size;
3149                         strcpy(im->text_prop[TEXT_PROP_AXIS].font,font);
3150                         im->text_prop[TEXT_PROP_UNIT].size=size;
3151                         strcpy(im->text_prop[TEXT_PROP_UNIT].font,font);
3152                         im->text_prop[TEXT_PROP_LEGEND].size=size;
3153                         strcpy(im->text_prop[TEXT_PROP_LEGEND].font,font);
3154                     }
3155                 } else {
3156                     rrd_set_error("invalid fonttag '%s'",prop);
3157                     return;
3158                 }
3159             } else {
3160                 rrd_set_error("invalid text property format");
3161                 return;
3162             }
3163             break;
3164         }
3165         case 'm':
3166             im->canvas->zoom = atof(optarg);
3167             if (im->canvas->zoom <= 0.0) {
3168                 rrd_set_error("zoom factor must be > 0");
3169                 return;
3170             }
3171           break;
3172         case 't':
3173             strncpy(im->title,optarg,150);
3174             im->title[150]='\0';
3175             break;
3176
3177         case 'R':
3178                 if ( strcmp( optarg, "normal" ) == 0 )
3179                         im->canvas->aa_type = AA_NORMAL;
3180                 else if ( strcmp( optarg, "light" ) == 0 )
3181                         im->canvas->aa_type = AA_LIGHT;
3182                 else if ( strcmp( optarg, "mono" ) == 0 )
3183                         im->canvas->aa_type = AA_NONE;
3184                 else
3185                 {
3186                         rrd_set_error("unknown font-render-mode '%s'", optarg );
3187                         return;
3188                 }
3189                 break;
3190
3191         case 'B':
3192             im->canvas->font_aa_threshold = atof(optarg);
3193                 break;
3194
3195         case '?':
3196             if (optopt != 0)
3197                 rrd_set_error("unknown option '%c'", optopt);
3198             else
3199                 rrd_set_error("unknown option '%s'",argv[optind-1]);
3200             return;
3201         }
3202     }
3203
3204     if (optind >= argc) {
3205        rrd_set_error("missing filename");
3206        return;
3207     }
3208
3209     if (im->logarithmic == 1 && (im->minval <= 0 || isnan(im->minval))){
3210         rrd_set_error("for a logarithmic yaxis you must specify a lower-limit > 0");
3211         return;
3212     }
3213
3214     if (proc_start_end(&start_tv,&end_tv,&start_tmp,&end_tmp) == -1){
3215         /* error string is set in parsetime.c */
3216         return;
3217     }
3218
3219     if (start_tmp < 3600*24*365*10){
3220         rrd_set_error("the first entry to fetch should be after 1980 (%ld)",start_tmp);
3221         return;
3222     }
3223
3224     if (end_tmp < start_tmp) {
3225         rrd_set_error("start (%ld) should be less than end (%ld)",
3226                start_tmp, end_tmp);
3227         return;
3228     }
3229
3230     im->start = start_tmp;
3231     im->end = end_tmp;
3232     im->step = max((long)im->step, (im->end-im->start)/im->xsize);
3233 }
3234
3235 int
3236 rrd_graph_check_vname(image_desc_t *im, char *varname, char *err)
3237 {
3238     if ((im->gdes[im->gdes_c-1].vidx=find_var(im,varname))==-1) {
3239         rrd_set_error("Unknown variable '%s' in %s",varname,err);
3240         return -1;
3241     }
3242     return 0;
3243 }
3244 int
3245 rrd_graph_color(image_desc_t *im, char *var, char *err, int optional)
3246 {
3247     char *color;
3248     graph_desc_t *gdp=&im->gdes[im->gdes_c-1];
3249
3250     color=strstr(var,"#");
3251     if (color==NULL) {
3252         if (optional==0) {
3253             rrd_set_error("Found no color in %s",err);
3254             return 0;
3255         }
3256         return 0;
3257     } else {
3258         int n=0;
3259         char *rest;
3260         gfx_color_t    col;
3261
3262         rest=strstr(color,":");
3263         if (rest!=NULL)
3264             n=rest-color;
3265         else
3266             n=strlen(color);
3267
3268         switch (n) {
3269             case 7:
3270                 sscanf(color,"#%6lx%n",&col,&n);
3271                 col = (col << 8) + 0xff /* shift left by 8 */;
3272                 if (n!=7) rrd_set_error("Color problem in %s",err);
3273                 break;
3274             case 9:
3275                 sscanf(color,"#%8lx%n",&col,&n);
3276                 if (n==9) break;
3277             default:
3278                 rrd_set_error("Color problem in %s",err);
3279         }
3280         if (rrd_test_error()) return 0;
3281         gdp->col = col;
3282         return n;
3283     }
3284 }
3285
3286
3287 int bad_format(char *fmt) {
3288     char *ptr;
3289     int n=0;
3290     ptr = fmt;
3291     while (*ptr != '\0')
3292         if (*ptr++ == '%') {
3293
3294              /* line cannot end with percent char */
3295              if (*ptr == '\0') return 1;
3296
3297              /* '%s', '%S' and '%%' are allowed */
3298              if (*ptr == 's' || *ptr == 'S' || *ptr == '%') ptr++;
3299
3300              /* or else '% 6.2lf' and such are allowed */
3301              else {
3302
3303                  /* optional padding character */
3304                  if (*ptr == ' ' || *ptr == '+' || *ptr == '-') ptr++;
3305
3306                  /* This should take care of 'm.n' with all three optional */
3307                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3308                  if (*ptr == '.') ptr++;
3309                  while (*ptr >= '0' && *ptr <= '9') ptr++;
3310
3311                  /* Either 'le', 'lf' or 'lg' must follow here */
3312                  if (*ptr++ != 'l') return 1;
3313                  if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g') ptr++;
3314                  else return 1;
3315                  n++;
3316             }
3317          }
3318
3319       return (n!=1);
3320 }
3321
3322
3323 int
3324 vdef_parse(gdes,str)
3325 struct graph_desc_t *gdes;
3326 char *str;
3327 {
3328     /* A VDEF currently is either "func" or "param,func"
3329      * so the parsing is rather simple.  Change if needed.
3330      */
3331     double      param;
3332     char        func[30];
3333     int         n;
3334
3335     n=0;
3336     sscanf(str,"%le,%29[A-Z]%n",&param,func,&n);
3337     if (n== (int)strlen(str)) { /* matched */
3338         ;
3339     } else {
3340         n=0;
3341         sscanf(str,"%29[A-Z]%n",func,&n);
3342         if (n== (int)strlen(str)) { /* matched */
3343             param=DNAN;
3344         } else {
3345             rrd_set_error("Unknown function string '%s' in VDEF '%s'"
3346                 ,str
3347                 ,gdes->vname
3348                 );
3349             return -1;
3350         }
3351     }
3352     if          (!strcmp("PERCENT",func)) gdes->vf.op = VDEF_PERCENT;
3353     else if     (!strcmp("MAXIMUM",func)) gdes->vf.op = VDEF_MAXIMUM;
3354     else if     (!strcmp("AVERAGE",func)) gdes->vf.op = VDEF_AVERAGE;
3355     else if     (!strcmp("MINIMUM",func)) gdes->vf.op = VDEF_MINIMUM;
3356     else if     (!strcmp("TOTAL",  func)) gdes->vf.op = VDEF_TOTAL;
3357     else if     (!strcmp("FIRST",  func)) gdes->vf.op = VDEF_FIRST;
3358     else if     (!strcmp("LAST",   func)) gdes->vf.op = VDEF_LAST;
3359     else {
3360         rrd_set_error("Unknown function '%s' in VDEF '%s'\n"
3361             ,func
3362             ,gdes->vname
3363             );
3364         return -1;
3365     };
3366
3367     switch (gdes->vf.op) {
3368         case VDEF_PERCENT:
3369             if (isnan(param)) { /* no parameter given */
3370                 rrd_set_error("Function '%s' needs parameter in VDEF '%s'\n"
3371                     ,func
3372                     ,gdes->vname
3373                     );
3374                 return -1;
3375             };
3376             if (param>=0.0 && param<=100.0) {
3377                 gdes->vf.param = param;
3378                 gdes->vf.val   = DNAN;  /* undefined */
3379                 gdes->vf.when  = 0;     /* undefined */
3380             } else {
3381                 rrd_set_error("Parameter '%f' out of range in VDEF '%s'\n"
3382                     ,param
3383                     ,gdes->vname
3384                     );
3385                 return -1;
3386             };
3387             break;
3388         case VDEF_MAXIMUM:
3389         case VDEF_AVERAGE:
3390         case VDEF_MINIMUM:
3391         case VDEF_TOTAL:
3392         case VDEF_FIRST:
3393         case VDEF_LAST:
3394             if (isnan(param)) {
3395                 gdes->vf.param = DNAN;
3396                 gdes->vf.val   = DNAN;
3397                 gdes->vf.when  = 0;
3398             } else {
3399                 rrd_set_error("Function '%s' needs no parameter in VDEF '%s'\n"
3400                     ,func
3401                     ,gdes->vname
3402                     );
3403                 return -1;
3404             };
3405             break;
3406     };
3407     return 0;
3408 }
3409
3410
3411 int
3412 vdef_calc(im,gdi)
3413 image_desc_t *im;
3414 int gdi;
3415 {
3416     graph_desc_t        *src,*dst;
3417     rrd_value_t         *data;
3418     long                step,steps;
3419
3420     dst = &im->gdes[gdi];
3421     src = &im->gdes[dst->vidx];
3422     data = src->data + src->ds;
3423     steps = (src->end - src->start) / src->step;
3424
3425 #if 0
3426 printf("DEBUG: start == %lu, end == %lu, %lu steps\n"
3427     ,src->start
3428     ,src->end
3429     ,steps
3430     );
3431 #endif
3432
3433     switch (dst->vf.op) {
3434         case VDEF_PERCENT: {
3435                 rrd_value_t *   array;
3436                 int             field;
3437
3438
3439                 if ((array = malloc(steps*sizeof(double)))==NULL) {
3440                     rrd_set_error("malloc VDEV_PERCENT");
3441                     return -1;
3442                 }
3443                 for (step=0;step < steps; step++) {
3444                     array[step]=data[step*src->ds_cnt];
3445                 }
3446                 qsort(array,step,sizeof(double),vdef_percent_compar);
3447
3448                 field = (steps-1)*dst->vf.param/100;
3449                 dst->vf.val  = array[field];
3450                 dst->vf.when = 0;       /* no time component */
3451                 free(array);
3452 #if 0
3453 for(step=0;step<steps;step++)
3454 printf("DEBUG: %3li:%10.2f %c\n",step,array[step],step==field?'*':' ');
3455 #endif
3456             }
3457             break;
3458         case VDEF_MAXIMUM:
3459             step=0;
3460             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3461             if (step == steps) {
3462                 dst->vf.val  = DNAN;
3463                 dst->vf.when = 0;
3464             } else {
3465                 dst->vf.val  = data[step*src->ds_cnt];
3466                 dst->vf.when = src->start + (step+1)*src->step;
3467             }
3468             while (step != steps) {
3469                 if (finite(data[step*src->ds_cnt])) {
3470                     if (data[step*src->ds_cnt] > dst->vf.val) {
3471                         dst->vf.val  = data[step*src->ds_cnt];
3472                         dst->vf.when = src->start + (step+1)*src->step;
3473                     }
3474                 }
3475                 step++;
3476             }
3477             break;
3478         case VDEF_TOTAL:
3479         case VDEF_AVERAGE: {
3480             int cnt=0;
3481             double sum=0.0;
3482             for (step=0;step<steps;step++) {
3483                 if (finite(data[step*src->ds_cnt])) {
3484                     sum += data[step*src->ds_cnt];
3485                     cnt ++;
3486                 };
3487             }
3488             if (cnt) {
3489                 if (dst->vf.op == VDEF_TOTAL) {
3490                     dst->vf.val  = sum*src->step;
3491                     dst->vf.when = cnt*src->step;       /* not really "when" */
3492                 } else {
3493                     dst->vf.val = sum/cnt;
3494                     dst->vf.when = 0;   /* no time component */
3495                 };
3496             } else {
3497                 dst->vf.val  = DNAN;
3498                 dst->vf.when = 0;
3499             }
3500             }
3501             break;
3502         case VDEF_MINIMUM:
3503             step=0;
3504             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3505             if (step == steps) {
3506                 dst->vf.val  = DNAN;
3507                 dst->vf.when = 0;
3508             } else {
3509                 dst->vf.val  = data[step*src->ds_cnt];
3510                 dst->vf.when = src->start + (step+1)*src->step;
3511             }
3512             while (step != steps) {
3513                 if (finite(data[step*src->ds_cnt])) {
3514                     if (data[step*src->ds_cnt] < dst->vf.val) {
3515                         dst->vf.val  = data[step*src->ds_cnt];
3516                         dst->vf.when = src->start + (step+1)*src->step;
3517                     }
3518                 }
3519                 step++;
3520             }
3521             break;
3522         case VDEF_FIRST:
3523             /* The time value returned here is one step before the
3524              * actual time value.  This is the start of the first
3525              * non-NaN interval.
3526              */
3527             step=0;
3528             while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3529             if (step == steps) { /* all entries were NaN */
3530                 dst->vf.val  = DNAN;
3531                 dst->vf.when = 0;
3532             } else {
3533                 dst->vf.val  = data[step*src->ds_cnt];
3534                 dst->vf.when = src->start + step*src->step;
3535             }
3536             break;
3537         case VDEF_LAST:
3538             /* The time value returned here is the
3539              * actual time value.  This is the end of the last
3540              * non-NaN interval.
3541              */
3542             step=steps-1;
3543             while (step >= 0 && isnan(data[step*src->ds_cnt])) step--;
3544             if (step < 0) { /* all entries were NaN */
3545                 dst->vf.val  = DNAN;
3546                 dst->vf.when = 0;
3547             } else {
3548                 dst->vf.val  = data[step*src->ds_cnt];
3549                 dst->vf.when = src->start + (step+1)*src->step;
3550             }
3551             break;
3552     }
3553     return 0;
3554 }
3555
3556 /* NaN < -INF < finite_values < INF */
3557 int
3558 vdef_percent_compar(a,b)
3559 const void *a,*b;
3560 {
3561     /* Equality is not returned; this doesn't hurt except
3562      * (maybe) for a little performance.
3563      */
3564
3565     /* First catch NaN values. They are smallest */
3566     if (isnan( *(double *)a )) return -1;
3567     if (isnan( *(double *)b )) return  1;
3568
3569     /* NaN doesn't reach this part so INF and -INF are extremes.
3570      * The sign from isinf() is compatible with the sign we return
3571      */
3572     if (isinf( *(double *)a )) return isinf( *(double *)a );
3573     if (isinf( *(double *)b )) return isinf( *(double *)b );
3574
3575     /* If we reach this, both values must be finite */
3576     if ( *(double *)a < *(double *)b ) return -1; else return 1;
3577 }