projects / screensavers / blame
| Commit | Line | Data |
|---|---|---|
| 3144ee8a AT |
1 | /* xscreensaver, Copyright (c) 1997, 1998, 2003 by Jamie Zawinski <jwz@jwz.org> |
| 2 | * | |
| 3 | * Permission to use, copy, modify, distribute, and sell this software and its | |
| 4 | * documentation for any purpose is hereby granted without fee, provided that | |
| 5 | * the above copyright notice appear in all copies and that both that | |
| 6 | * copyright notice and this permission notice appear in supporting | |
| 7 | * documentation. No representations are made about the suitability of this | |
| 8 | * software for any purpose. It is provided "as is" without express or | |
| 9 | * implied warranty. | |
| 10 | */ | |
| 11 | ||
| 12 | #ifndef __YARANDOM_H__ | |
| 13 | #define __YARANDOM_H__ | |
| 14 | ||
| 15 | #ifdef HAVE_CONFIG_H | |
| 16 | # include "config.h" | |
| 17 | #endif | |
| 18 | ||
| 19 | #ifdef HAVE_INTTYPES_H | |
| 20 | # include <inttypes.h> | |
| 21 | #endif | |
| 22 | ||
| 23 | #undef random | |
| 24 | #undef rand | |
| 25 | #undef drand48 | |
| 26 | #undef srandom | |
| 27 | #undef srand | |
| 28 | #undef frand | |
| 29 | #undef sranddev | |
| 30 | #undef srandomdev | |
| 31 | #undef arc4random | |
| 32 | #undef arc4random_addrandom | |
| 33 | #undef arc4random_buf | |
| 34 | #undef arc4random_stir | |
| 35 | #undef arc4random_uniform | |
| 36 | #undef erand48 | |
| 37 | #undef jrand48 | |
| 38 | #undef lcong48 | |
| 39 | #undef lrand48 | |
| 40 | #undef mrand48 | |
| 41 | #undef nrand48 | |
| 42 | #undef seed48 | |
| 43 | #undef srand48 | |
| 44 | #undef rand_r | |
| 45 | #undef RAND_MAX | |
| 46 | ||
| 47 | #ifdef VMS | |
| 48 | # include "vms-gtod.h" | |
| 49 | #endif | |
| 50 | ||
| 51 | extern unsigned int ya_random (void); | |
| 52 | extern void ya_rand_init (unsigned int); | |
| 53 | ||
| 54 | #define random() ya_random() | |
| 55 | #define RAND_MAX 0xFFFFFFFF | |
| 56 | ||
| 57 | /*#define srandom(i) ya_rand_init(0)*/ | |
| 58 | ||
| 59 | /* Define these away to keep people from using the wrong APIs in xscreensaver. | |
| 60 | */ | |
| 61 | #define rand __ERROR_use_random_not_rand_in_xscreensaver__ | |
| 62 | #define drand48 __ERROR_use_frand_not_drand48_in_xscreensaver__ | |
| 63 | #define srandom __ERROR_do_not_call_srandom_in_xscreensaver__ | |
| 64 | #define srand __ERROR_do_not_call_srand_in_xscreensaver__ | |
| 65 | #define sranddev __ERROR_do_not_call_sranddev_in_xscreensaver__ | |
| 66 | #define ya_rand_init __ERROR_do_not_call_ya_rand_init_in_xscreensaver__ | |
| 67 | #define srandomdev __ERROR_do_not_call_srandomdev_in_xscreensaver__ | |
| 68 | #define arc4random __ERROR_do_not_call_arc4random_in_xscreensaver__ | |
| 69 | #define arc4random_addrandom __ERROR_do_not_call_arc4random_in_xscreensaver__ | |
| 70 | #define arc4random_buf __ERROR_do_not_call_arc4random_in_xscreensaver__ | |
| 71 | #define arc4random_stir __ERROR_do_not_call_arc4random_in_xscreensaver__ | |
| 72 | #define arc4random_uniform __ERROR_do_not_call_arc4random_in_xscreensaver__ | |
| 73 | #define erand48 __ERROR_do_not_call_erand48_in_xscreensaver__ | |
| 74 | #define jrand48 __ERROR_do_not_call_jrand48_in_xscreensaver__ | |
| 75 | #define lcong48 __ERROR_do_not_call_lcong48_in_xscreensaver__ | |
| 76 | #define lrand48 __ERROR_do_not_call_lrand48_in_xscreensaver__ | |
| 77 | #define mrand48 __ERROR_do_not_call_mrand48_in_xscreensaver__ | |
| 78 | #define nrand48 __ERROR_do_not_call_nrand48_in_xscreensaver__ | |
| 79 | #define seed48 __ERROR_do_not_call_seed48_in_xscreensaver__ | |
| 80 | #define srand48 __ERROR_do_not_call_srand48_in_xscreensaver__ | |
| 81 | #define rand_r __ERROR_do_not_call_rand_r_in_xscreensaver__ | |
| 82 | ||
| 83 | ||
| 84 | #if defined (__GNUC__) && (__GNUC__ >= 2) | |
| 85 | /* Implement frand using GCC's statement-expression extension. */ | |
| 86 | ||
| 87 | # define frand(f) \ | |
| 88 | __extension__ \ | |
| 89 | ({ double tmp = ((((double) random()) * ((double) (f))) / \ | |
| 90 | ((double) ((unsigned int)~0))); \ | |
| 91 | tmp < 0 ? (-tmp) : tmp; }) | |
| 92 | ||
| 93 | #else /* not GCC2 - implement frand using a global variable.*/ | |
| 94 | ||
| 95 | static double _frand_tmp_; | |
| 96 | # define frand(f) \ | |
| 97 | (_frand_tmp_ = ((((double) random()) * ((double) (f))) / \ | |
| 98 | ((double) ((unsigned int)~0))), \ | |
| 99 | _frand_tmp_ < 0 ? (-_frand_tmp_) : _frand_tmp_) | |
| 100 | ||
| 101 | #endif /* not GCC2 */ | |
| 102 | ||
| 103 | /* Compatibility with the xlockmore RNG API | |
| 104 | (note that the xlockmore hacks never expect negative numbers.) | |
| 105 | */ | |
| 106 | #define LRAND() ((long) (random() & 0x7fffffff)) | |
| 107 | ||
| 108 | /* The first NRAND(n) is much faster, when uint64_t is available to allow it. | |
| 109 | * Especially on ARM and other processors without built-in division. | |
| 110 | * | |
| 111 | * n must be greater than zero. | |
| 112 | * | |
| 113 | * The division by RAND_MAX+1 should optimize down to a bit shift. | |
| 114 | * | |
| 115 | * Although the result here is never negative, this needs to return signed | |
| 116 | * integers: A binary operator in C requires operands have the same type, and | |
| 117 | * if one side is signed and the other is unsigned, but they're both the same | |
| 118 | * size, then the signed operand is cast to unsigned, and the result is | |
| 119 | * similarly unsigned. This can potentially cause problems when idioms like | |
| 120 | * "NRAND(n) * RANDSIGN()" (where RANDSIGN() returns either -1 or 1) is used | |
| 121 | * to get random numbers from the range (-n,n). | |
| 122 | */ | |
| 123 | #ifdef HAVE_INTTYPES_H | |
| 124 | # define NRAND(n) ((int32_t) ((uint64_t) random() * (uint32_t) (n) / \ | |
| 125 | ((uint64_t) RAND_MAX + 1))) | |
| 126 | #else | |
| 127 | # define NRAND(n) ((int) (LRAND() % (n))) | |
| 128 | #endif | |
| 129 | ||
| 130 | #define MAXRAND (2147483648.0) /* unsigned 1<<31 as a float */ | |
| 131 | #define SRAND(n) /* already seeded by screenhack.c */ | |
| 132 | ||
| 133 | #endif /* __YARANDOM_H__ */ |