87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
/** $MirBSD: src/bin/ksh/rnd.c,v 2.1 2004/12/10 18:09:42 tg Exp $ */
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/*-
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* Copyright (c) 2004
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* Thorsten "mirabile" Glaser <tg@66h.42h.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, publicly perform, modify,
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* merge, distribute, sell, give away or sublicence, provided all co-
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* pyright notices above, these terms and the disclaimer are retained
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* in all redistributions or reproduced in accompanying documentation
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* 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 licensor, an
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* author or contributor be held liable for any damage, direct, indi-
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* rect or other, however caused, arising in any way out of the usage
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* of this 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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__RCSID("$MirBSD: src/bin/ksh/rnd.c,v 2.1 2004/12/10 18:09:42 tg Exp $");
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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(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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#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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long sv;
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rnd_state = 1 | rnd_get();
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sv = (rnd_get() << (newval & 7)) ^ 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((char *)&sv, sizeof(sv));
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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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