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/*
* grandom.cc
*
* This file is licensed under the GPLv2 or later
*
* Pseudo-random number generation
*
* Copyright (C) 2012 Fabio D'Urso <fabiodurso@hotmail.it>
*/
#include <config.h>
#include "grandom.h"
#include "gtypes.h"
#ifdef HAVE_RAND_R // rand_r backend (POSIX)
static GBool initialized = gFalse;
#include <stdlib.h>
#include <time.h>
static unsigned int seed;
static void initialize() {
if (!initialized) {
seed = time(nullptr);
initialized = gTrue;
}
}
void grandom_fill(Guchar *buff, int size)
{
initialize();
while (size--)
*buff++ = rand_r(&seed) % 256;
}
double grandom_double()
{
initialize();
return rand_r(&seed) / (1 + (double)RAND_MAX);
}
#else // srand+rand backend (unsafe, because it may interfere with the application)
static GBool initialized = gFalse;
#include <stdlib.h>
#include <time.h>
static void initialize() {
if (!initialized) {
srand(time(nullptr));
initialized = gTrue;
}
}
void grandom_fill(Guchar *buff, int size)
{
initialize();
while (size--)
*buff++ = rand() % 256;
}
double grandom_double()
{
initialize();
return rand() / (1 + (double)RAND_MAX);
}
#endif
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