86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
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/* $MirBSD: rnd.c,v 1.1 2004/05/24 19:06:55 tg Exp $
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*-
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* Copyright (c) 2004
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* Thorsten Glaser <x86@ePost.de>
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*
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* Licensee is hereby permitted to deal in this work without restric-
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* tion, including unlimited rights to use, publically perform, modi-
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* fy, merge, distribute, sell, give away or sublicence, provided the
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* above copyright notices, these terms and the disclaimer are retai-
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* ned in all redistributions, or reproduced in accompanying documen-
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* tation or other materials provided with binary redistributions.
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*
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* Licensor hereby provides this work "AS IS" and WITHOUT WARRANTY of
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* any kind, expressed or implied, to the maximum extent permitted by
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* applicable law, but with the warranty of being written without ma-
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* licious intent or gross negligence; in no event shall an author or
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* contributor be held liable for any direct, indirect or other dama-
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* ge, however caused, arising in any way out of the usage of covered
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* work, even if advised of the possibility of such damage.
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*/
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#include "sh.h"
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#include "proto.h"
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#ifndef HAVE_SRANDOM
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#undef HAVE_RANDOM
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#endif
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#ifdef KSH
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int rnd_state;
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void
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rnd_seed(long newval)
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{
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rnd_put(time(NULL) ^ (getpid() << 16) ^ newval);
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rnd_state = 0;
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}
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long
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rnd_get(void)
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{
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#ifdef HAVE_ARC4RANDOM
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if (!rnd_state) {
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return arc4random() & 0x7FFF;
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} else
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#endif
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#ifdef HAVE_RANDOM
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return random() & 0x7FFF;
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#else
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return rand();
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#endif
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}
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void
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rnd_put(long newval)
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{
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u_int32_t sv;
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rnd_state = 1 | rnd_get();
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sv = (((u_int32_t)rnd_get()) << (newval & 7)) ^ (u_int32_t)newval;
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#if defined(HAVE_ARC4RANDOM_PUSH)
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arc4random_push(sv);
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#elif defined(HAVE_ARC4RANDOM_ADDRANDOM)
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arc4random_addrandom(sv, 4);
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#endif
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#ifdef HAVE_ARC4RANDOM
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sv ^= arc4random();
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#endif
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#ifdef HAVE_RANDOM
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srandom(sv);
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#else
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srand(sv);
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#endif
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while (rnd_state) {
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rnd_get();
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rnd_state >>= 1;
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}
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rnd_state = 1;
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}
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#endif /* def KSH */
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