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6d7e8eda | 1 | /* Copyright (C) 1992-2023 Free Software Foundation, Inc. |
47707456 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
47707456 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 8 | |
47707456 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <string.h> |
19 | #include <stdlib.h> | |
f9a75540 | 20 | #include <random-bits.h> |
89a3dd44 | 21 | #include <unistd.h> |
28f540f4 RM |
22 | |
23 | char * | |
47707456 | 24 | strfry (char *string) |
28f540f4 | 25 | { |
c4563d2d | 26 | static int init; |
47707456 | 27 | static struct random_data rdata; |
28f540f4 RM |
28 | |
29 | if (!init) | |
30 | { | |
42ba2c11 | 31 | static char state[32]; |
47707456 | 32 | rdata.state = NULL; |
f9a75540 | 33 | __initstate_r (random_bits (), |
89a3dd44 | 34 | state, sizeof (state), &rdata); |
28f540f4 RM |
35 | init = 1; |
36 | } | |
37 | ||
3eb9c809 UD |
38 | size_t len = strlen (string); |
39 | if (len > 0) | |
40 | for (size_t i = 0; i < len - 1; ++i) | |
41 | { | |
42 | int32_t j; | |
43 | __random_r (&rdata, &j); | |
44 | j = j % (len - i) + i; | |
45 | ||
46 | char c = string[i]; | |
47 | string[i] = string[j]; | |
48 | string[j] = c; | |
49 | } | |
28f540f4 RM |
50 | |
51 | return string; | |
52 | } |