Srdjan Veljkovic / Pubnub_mbed2_sync

This is the Pubnub library for MBed2 ("classic") with the "sync" interface. It is based on the Pubnub C-core library.

Dependencies:   Pubnub_c_core_mbed2_pal

Dependents:   Pubnub_ATT_IoT_SK_WNC_sync pubnub_sync

srand_from_pubnub_time.cpp

Committer:
sveljko
Date:
2016-11-11
Revision:
2:4d49720c7200

File content as of revision 2:4d49720c7200:

#include "srand_from_pubnub_time.h"

#include "pubnub_coreapi.h"
#include "pubnub_ntf_sync.h"

#include <stdlib.h>
#include <string.h>


int srand_from_pubnub_time(pubnub_t *pbp)
{
    pubnub_res rslt = pubnub_time(pbp);
    if (rslt != PNR_STARTED) {
        return -1;
    }
    rslt = pubnub_await(pbp);
    if (rslt != PNR_OK) {
        return -1;
    }
    char const* pbtime = pubnub_get(pbp);
    if (0 == pbtime)  {
        return -1;
    }
    size_t length_of_time = strlen(pbtime);
    if (0 == length_of_time) {
        return -1;
    }
    char const *s = pbtime + length_of_time - 1;
    unsigned int val_for_srand = 0;
    for (int i = 0; (i < 10) && (s > pbtime); ++i, --s) {
        val_for_srand = val_for_srand * 10 + *s - '0';
    }
    
    srand(val_for_srand);
    
    return 0;
}