56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/* Copyright (C) 1992, 1996, 1999, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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char *
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strfry (char *string)
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{
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static int init;
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static struct random_data rdata;
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size_t len, i;
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if (!init)
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{
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static char state[32];
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rdata.state = NULL;
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__initstate_r (time ((time_t *) NULL) ^ getpid (),
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state, sizeof (state), &rdata);
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init = 1;
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}
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len = strlen (string);
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for (i = 0; i < len; ++i)
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{
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int32_t j;
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char c;
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__random_r (&rdata, &j);
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j %= len;
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c = string[i];
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string[i] = string[j];
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string[j] = c;
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}
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return string;
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}
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