1 | /* Copyright (C) 2015-2016 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
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. |
8 | |
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 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <nss.h> |
19 | #include <string.h> |
20 | |
21 | /* Rewrite VALUE to a valid field value in the NSS database. Invalid |
22 | characters are replaced with a single space character ' '. If |
23 | VALUE is NULL, the empty string is returned. *TO_BE_FREED is |
24 | overwritten with a pointer the caller has to free if the function |
25 | returns successfully. On failure, return NULL. */ |
26 | const char * |
27 | internal_function |
28 | __nss_rewrite_field (const char *value, char **to_be_freed) |
29 | { |
30 | *to_be_freed = NULL; |
31 | if (value == NULL) |
32 | return "" ; |
33 | |
34 | /* Search for non-allowed characters. */ |
35 | const char *p = strpbrk (value, __nss_invalid_field_characters); |
36 | if (p == NULL) |
37 | return value; |
38 | *to_be_freed = __strdup (value); |
39 | if (*to_be_freed == NULL) |
40 | return NULL; |
41 | |
42 | /* Switch pointer to freshly-allocated buffer. */ |
43 | char *bad = *to_be_freed + (p - value); |
44 | do |
45 | { |
46 | *bad = ' '; |
47 | bad = strpbrk (bad + 1, __nss_invalid_field_characters); |
48 | } |
49 | while (bad != NULL); |
50 | |
51 | return *to_be_freed; |
52 | } |
53 | |