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57 lines
1.4 KiB
57 lines
1.4 KiB
/*
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* fast pseudo random generation
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*
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* Copyright (C) 2007 iptelorg GmbH
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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*History:
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*--------
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* 2007-06-15 wrapper around isaac (see
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* http://www.burtleburtle.net/bob/rand/isaacafa.html) (andrei)
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*/
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#include "fastrand.h"
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#include <stdlib.h>
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#include "isaac/rand.h"
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#define FASTRAND_MAX ((unsigned int)(-1))
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static randctx is_ctx;
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/* side effect: seeds also random w/ seed */
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void fastrand_seed(unsigned int seed)
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{
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int i;
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srandom(seed);
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for (i=0; i<RANDSIZ; i++)
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is_ctx.randrsl[i]=random();
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randinit(&is_ctx, 1);
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}
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unsigned int fastrand()
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{
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return rand(&is_ctx);
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}
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/* generate a random number between 0 and max ( 0 <=r<=max) */
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unsigned int fastrand_max(unsigned int max)
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{
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return fastrand()%(max+1);
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}
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