src/rrd_first.c

   1 /*****************************************************************************
   2  * RRDtool 1.2.17  Copyright by Tobi Oetiker, 1997-2006
   3  *****************************************************************************
   4  * rrd_first Return
   5  *****************************************************************************
   6  * Initial version by Burton Strauss, ntopSupport.com - 3/2005
   7  *****************************************************************************/
   8
   9 #include "rrd_tool.h"
  10
  11
  12 time_t
  13 rrd_first(int argc, char **argv)
  14 {
  15     int target_rraindex=0;
  16     char *endptr;
  17     optind = 0; opterr = 0;  /* initialize getopt */
  18
  19     while (1){
  20         static struct option long_options[] =
  21         {
  22             {"rraindex", required_argument, 0, 129},
  23             {0,0,0,0}
  24         };
  25         int option_index = 0;
  26         int opt;
  27         opt = getopt_long(argc, argv, "", long_options, &option_index);
  28
  29         if(opt == EOF)
  30             break;
  31
  32         switch(opt) {
  33           case 129:
  34             target_rraindex=strtol(optarg,&endptr,0);
  35             if(target_rraindex < 0) {
  36                 rrd_set_error("invalid rraindex number");
  37                 return(-1);
  38             }
  39             break;
  40           default:
  41             rrd_set_error("usage rrdtool %s [--rraindex number] file.rrd", argv[0]);
  42             return(-1);
  43         }
  44     }
  45
  46     if(optind >= argc){
  47         rrd_set_error("not enough arguments");
  48         return -1;
  49     }
  50
  51     return(rrd_first_r(argv[optind], target_rraindex));
  52 }
  53
  54
  55 time_t
  56 rrd_first_r(const char *filename, const int rraindex)
  57 {
  58     long rra_start,
  59          timer;
  60     time_t then;
  61     FILE *in_file;
  62     rrd_t rrd;
  63
  64     if(rrd_open(filename,&in_file,&rrd, RRD_READONLY)==-1){
  65         rrd_set_error("could not open RRD");
  66         return(-1);
  67     }
  68
  69     if((rraindex < 0) || (rraindex >= (int)rrd.stat_head->rra_cnt)) {
  70         rrd_set_error("invalid rraindex number");
  71         rrd_free(&rrd);
  72         fclose(in_file);
  73         return(-1);
  74     }
  75
  76     rra_start = ftell(in_file);
  77     fseek(in_file,
  78           (rra_start +
  79            (rrd.rra_ptr[rraindex].cur_row+1) *
  80            rrd.stat_head->ds_cnt *
  81            sizeof(rrd_value_t)),
  82           SEEK_SET);
  83     timer = - (rrd.rra_def[rraindex].row_cnt-1);
  84     if (rrd.rra_ptr[rraindex].cur_row + 1 > rrd.rra_def[rraindex].row_cnt) {
  85       fseek(in_file,rra_start,SEEK_SET);
  86     }
  87     then = (rrd.live_head->last_up -
  88             rrd.live_head->last_up %
  89             (rrd.rra_def[rraindex].pdp_cnt*rrd.stat_head->pdp_step)) +
  90            (timer *
  91             rrd.rra_def[rraindex].pdp_cnt*rrd.stat_head->pdp_step);
  92
  93     rrd_free(&rrd);
  94     fclose(in_file);
  95     return(then);
  96 }
  97
  98
  99
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