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/* vim: set tabstop=4 expandtab shiftwidth=4 softtabstop=4: */
/*
* Copyright 2015 University of Piemonte Orientale, Computer Science Institute
*
* This file is part of UPOalglib.
*
* UPOalglib is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* UPOalglib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with UPOalglib. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdlib.h>
#include <upo/random.h>
#include <upo/utility.h>
double upo_random_uniform_real(double lo, double hi)
{
return lo + rand()/(RAND_MAX+1.0)*(hi-lo);
}
int upo_random_uniform_int(int lo, int hi)
{
return lo + rand()/(RAND_MAX+1.0)*(hi-lo);
}
void upo_random_shuffle(void *base, size_t n, size_t size)
{
char *ptr = base;
size_t i;
assert( base != NULL );
for (i = 0; i < n; ++i)
{
size_t r = upo_random_uniform_int(i, n-i);
if (i != r)
{
upo_swap(ptr+i*size, ptr+r*size, size);
}
}
}
char* upo_random_string(char *s, size_t n)
{
size_t i = 0;
for (; i < n; ++i)
{
s[i] = upo_random_uniform_int(' ', '~');
}
s[n] = '\0';
return s;
}