54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* xscreensaver, Copyright (c) 1997, 1998 by Jamie Zawinski <jwz@jwz.org>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation. No representations are made about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*/
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#ifndef __YARANDOM_H__
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#define __YARANDOM_H__
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#undef random
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#undef rand
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#undef drand48
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#undef srandom
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#undef srand
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#undef srand48
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#undef frand
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#undef RAND_MAX
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#ifdef VMS
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#include "vms-gtod.h"
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#endif
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#define random() ya_random()
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#define srandom(i) ya_rand_init(0)
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#define RAND_MAX 0x7FFFFFFF
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extern unsigned int ya_random(void);
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extern void ya_rand_init(unsigned int);
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#if defined (__GNUC__) && (__GNUC__ >= 2)
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/* Implement frand using GCC's statement-expression extension. */
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#define frand(f) \
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({ double tmp = (((double) random()) / \
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(((double) ((unsigned int)~0)) / ((double) (f)))); \
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tmp < 0 ? (-tmp) : tmp; })
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#else /* not GCC2 - implement frand using a global variable. */
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static double _frand_tmp_;
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#define frand(f) \
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(_frand_tmp_ = (((double) random()) / \
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(((double) ((unsigned int)~0)) / ((double) (f)))), \
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_frand_tmp_ < 0 ? (-_frand_tmp_) : _frand_tmp_)
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#endif /* not GCC2 */
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#endif /* __YARANDOM_H__ */
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