| 1 | /* xscreensaver, Copyright (c) 1997, 1998, 2003 by Jamie Zawinski <jwz@jwz.org> |
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| 2 | * |
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| 3 | * Permission to use, copy, modify, distribute, and sell this software and its |
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| 4 | * documentation for any purpose is hereby granted without fee, provided that |
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| 5 | * the above copyright notice appear in all copies and that both that |
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| 6 | * copyright notice and this permission notice appear in supporting |
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| 7 | * documentation. No representations are made about the suitability of this |
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| 8 | * software for any purpose. It is provided "as is" without express or |
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| 9 | * implied warranty. |
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| 10 | */ |
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| 11 | |
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| 12 | #ifndef __YARANDOM_H__ |
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| 13 | #define __YARANDOM_H__ |
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| 14 | |
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| 15 | #undef random |
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| 16 | #undef rand |
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| 17 | #undef drand48 |
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| 18 | #undef srandom |
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| 19 | #undef srand |
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| 20 | #undef srand48 |
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| 21 | #undef frand |
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| 22 | #undef RAND_MAX |
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| 23 | |
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| 24 | #ifdef VMS |
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| 25 | # include "vms-gtod.h" |
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| 26 | #endif |
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| 27 | |
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| 28 | extern unsigned int ya_random (void); |
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| 29 | extern void ya_rand_init (unsigned int); |
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| 30 | |
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| 31 | #define random() ya_random() |
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| 32 | #define RAND_MAX 0xFFFFFFFF |
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| 33 | |
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| 34 | /*#define srandom(i) ya_rand_init(0)*/ |
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| 35 | |
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| 36 | /* Define these away to keep people from using the wrong APIs in xscreensaver. |
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| 37 | */ |
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| 38 | #define rand __ERROR_use_random_not_rand_in_xscreensaver__ |
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| 39 | #define drand48 __ERROR_use_frand_not_drand48_in_xscreensaver__ |
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| 40 | #define srandom __ERROR_do_not_call_srandom_in_xscreensaver__ |
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| 41 | #define srand __ERROR_do_not_call_srand_in_xscreensaver__ |
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| 42 | #define srand48 __ERROR_do_not_call_srand48_in_xscreensaver__ |
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| 43 | #define ya_rand_init __ERROR_do_not_call_ya_rand_init_in_xscreensaver__ |
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| 44 | |
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| 45 | |
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| 46 | #if defined (__GNUC__) && (__GNUC__ >= 2) |
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| 47 | /* Implement frand using GCC's statement-expression extension. */ |
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| 48 | |
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| 49 | # define frand(f) \ |
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| 50 | __extension__ \ |
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| 51 | ({ double tmp = ((((double) random()) * ((double) (f))) / \ |
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| 52 | ((double) ((unsigned int)~0))); \ |
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| 53 | tmp < 0 ? (-tmp) : tmp; }) |
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| 54 | |
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| 55 | #else /* not GCC2 - implement frand using a global variable.*/ |
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| 56 | |
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| 57 | static double _frand_tmp_; |
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| 58 | # define frand(f) \ |
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| 59 | (_frand_tmp_ = ((((double) random()) * ((double) (f))) / \ |
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| 60 | ((double) ((unsigned int)~0))), \ |
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| 61 | _frand_tmp_ < 0 ? (-_frand_tmp_) : _frand_tmp_) |
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| 62 | |
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| 63 | #endif /* not GCC2 */ |
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| 64 | |
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| 65 | #endif /* __YARANDOM_H__ */ |
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