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/* Copyright (c) 2000 Shlomi Fish
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* rand.h - header for the Freecell Solver pseudo-random number generator.
*/
#ifndef FC_SOLVE__RAND_H
#define FC_SOLVE__RAND_H
#ifdef __cplusplus
extern "C" {
#endif
#include "inline.h"
typedef long fcs_rand_t;
static GCC_INLINE void fc_solve_rand_init(fcs_rand_t * my_rand, unsigned int seed)
{
*my_rand = (long)seed;
}
static GCC_INLINE int fc_solve_rand_rand15(fcs_rand_t * my_rand)
{
*my_rand = ((*my_rand) * 214013 + 2531011);
return ((*my_rand) >> 16) & 0x7fff;
}
/*
*
* This function constructs a larger integral number of out of two
* 15-bit ones.
*
* */
static GCC_INLINE int fc_solve_rand_get_random_number(fcs_rand_t * my_rand)
{
int one, two;
one = fc_solve_rand_rand15(my_rand);
two = fc_solve_rand_rand15(my_rand);
return (one | (two << 15));
}
#ifdef __cplusplus
}
#endif
#endif
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