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[glibc.git] / string / strfry.c
blob98aa71aa3f8ccdbe31f5aa8fdbc3433452364482
1 /* Copyright (C) 1992, 1996 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <string.h>
20 #include <stdlib.h>
21 #include <time.h>
23 char *
24 strfry (char *string)
26 static int init = 0;
27 static struct random_data rdata;
28 size_t len, i;
30 if (!init)
32 static int state[8] = { 1, 2, 3, 4, 5, 6, 7, 8 };
33 rdata.state = NULL;
34 __initstate_r (time ((time_t *) NULL), state, 8, &rdata);
35 init = 1;
38 len = strlen (string);
39 for (i = 0; i < len; ++i)
41 int32_t j;
42 char c;
44 __random_r (&rdata, &j);
45 j %= len;
47 c = string[i];
48 string[i] = string[j];
49 string[j] = c;
52 return string;