mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-21 04:31:04 +08:00
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/* Copyright (C) 1992-2024 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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <random-bits.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 (random_bits (),
|
|
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;
|
|
}
|