forked from github/server
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/*
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* +-------------------+ Christian Schlittchen <corwin@amber.kn-bremen.de>
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* | | Enno Rehling <enno@eressea.de>
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* | Eressea PBEM host | Katja Zedel <katze@felidae.kn-bremen.de>
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* | (c) 1998 - 2005 |
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* | | This program may not be used, modified or distributed
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* +-------------------+ without prior permission by the authors of Eressea.
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*
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*/
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#ifndef UTIL_RNG_H
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#define UTIL_RNG_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define RNG_MT
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#ifdef RNG_MT
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/* initializes mt[N] with a seed */
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extern void init_genrand(unsigned long s);
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/* generates a random number on [0,0xffffffff]-interval */
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extern unsigned long genrand_int32(void);
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/* generates a random number on [0,1)-real-interval */
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extern double rng_injectable_double(void);
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/* generates a random number on [0,0x7fffffff]-interval */
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long genrand_int31(void);
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# define rng_init(seed) init_genrand(seed)
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# define rng_int (int)genrand_int31
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# define rng_uint (unsigned int)genrand_int32
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# define rng_double rng_injectable_double
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# define RNG_RAND_MAX 0x7fffffff
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#else
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# include <stdlib.h>
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# define rng_init(seed) srand(seed)
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# define rng_int rand()
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# define rng_double ((rand()%RAND_MAX)/(double)RAND_MAX)
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# define RNG_RAND_MAX RAND_MAX
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#endif
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#define RAND_ROUND(fractional) ((rng_double() < fractional-(int)fractional)?((int)fractional+1):((int)fractional))
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#ifdef __cplusplus
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}
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#endif
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#endif
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