mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 07:10:06 +00:00
3eb9c80984
2008-03-31 Ulrich Drepper <drepper@redhat.com> [BZ #6007] * string/strfry.c: Handle empty strings again.
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/* Copyright (C) 1992, 1996, 1999, 2002, 2007 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
char *
|
|
strfry (char *string)
|
|
{
|
|
static int init;
|
|
static struct random_data rdata;
|
|
|
|
if (!init)
|
|
{
|
|
static char state[32];
|
|
rdata.state = NULL;
|
|
__initstate_r (time ((time_t *) NULL) ^ getpid (),
|
|
state, sizeof (state), &rdata);
|
|
init = 1;
|
|
}
|
|
|
|
size_t len = strlen (string);
|
|
if (len > 0)
|
|
for (size_t i = 0; i < len - 1; ++i)
|
|
{
|
|
int32_t j;
|
|
__random_r (&rdata, &j);
|
|
j = j % (len - i) + i;
|
|
|
|
char c = string[i];
|
|
string[i] = string[j];
|
|
string[j] = c;
|
|
}
|
|
|
|
return string;
|
|
}
|