srand_from_pubnub_time.cpp

00001 #include "srand_from_pubnub_time.h"
00002 
00003 #include "pubnub_coreapi.h"
00004 #include "pubnub_ntf_sync.h"
00005 
00006 #include <stdlib.h>
00007 #include <string.h>
00008 
00009 
00010 int srand_from_pubnub_time(pubnub_t *pbp)
00011 {
00012     pubnub_res rslt = pubnub_time(pbp);
00013     if (rslt != PNR_STARTED) {
00014         return -1;
00015     }
00016     rslt = pubnub_await(pbp);
00017     if (rslt != PNR_OK) {
00018         return -1;
00019     }
00020     char const* pbtime = pubnub_get(pbp);
00021     if (0 == pbtime)  {
00022         return -1;
00023     }
00024     size_t length_of_time = strlen(pbtime);
00025     if (0 == length_of_time) {
00026         return -1;
00027     }
00028     char const *s = pbtime + length_of_time - 1;
00029     unsigned int val_for_srand = 0;
00030     for (int i = 0; (i < 10) && (s > pbtime); ++i, --s) {
00031         val_for_srand = val_for_srand * 10 + *s - '0';
00032     }
00033     
00034     srand(val_for_srand);
00035     
00036     return 0;
00037 }