55 lines
935 B
C
55 lines
935 B
C
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/*
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* This file Copyright (C) 2007-2014 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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* $Id$
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*/
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#include <assert.h>
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#include <stdlib.h> /* abs (), srand (), rand () */
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#include "transmission.h"
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#include "crypto-utils.h"
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#include "utils.h"
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/***
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****
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***/
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int
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tr_rand_int (int upper_bound)
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{
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int noise;
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assert (upper_bound > 0);
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while (tr_rand_buffer (&noise, sizeof (noise)))
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{
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noise = abs(noise) % upper_bound;
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/* abs(INT_MIN) is undefined and could return negative value */
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if (noise >= 0)
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return noise;
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}
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/* fall back to a weaker implementation... */
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return tr_rand_int_weak (upper_bound);
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}
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int
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tr_rand_int_weak (int upper_bound)
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{
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static bool init = false;
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assert (upper_bound > 0);
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if (!init)
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{
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srand (tr_time_msec ());
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init = true;
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}
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return rand () % upper_bound;
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}
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