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- /*
- * Simple xorshift PRNG
- * see http://www.jstatsoft.org/v08/i14/paper
- *
- * Copyright (c) 2012 Michael Walle
- * Michael Walle <michael@walle.cc>
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program 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 2 of
- * the License, or (at your option) any later version.
- *
- * This program 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 this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
- #include <common.h>
- static unsigned int y = 1U;
- unsigned int rand_r(unsigned int *seedp)
- {
- *seedp ^= (*seedp << 13);
- *seedp ^= (*seedp >> 17);
- *seedp ^= (*seedp << 5);
- return *seedp;
- }
- unsigned int rand(void)
- {
- return rand_r(&y);
- }
- void srand(unsigned int seed)
- {
- y = seed;
- }
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