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b6ab06ce | 1 | /* Environment handling for dynamic loader. |
d614a753 | 2 | Copyright (C) 1995-2020 Free Software Foundation, Inc. |
b6ab06ce UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
b6ab06ce UD |
18 | |
19 | #include <string.h> | |
20 | #include <stdlib.h> | |
21 | #include <unistd.h> | |
22 | #include <ldsodefs.h> | |
23 | ||
24 | /* Walk through the environment of the process and return all entries | |
25 | starting with `LD_'. */ | |
26 | char * | |
b6ab06ce UD |
27 | _dl_next_ld_env_entry (char ***position) |
28 | { | |
29 | char **current = *position; | |
30 | char *result = NULL; | |
31 | ||
32 | while (*current != NULL) | |
33 | { | |
34 | if (__builtin_expect ((*current)[0] == 'L', 0) | |
35 | && (*current)[1] == 'D' && (*current)[2] == '_') | |
36 | { | |
37 | result = &(*current)[3]; | |
38 | ||
39 | /* Save current position for next visit. */ | |
40 | *position = ++current; | |
41 | ||
42 | break; | |
43 | } | |
44 | ||
45 | ++current; | |
46 | } | |
47 | ||
48 | return result; | |
49 | } | |
50 | ||
51 | ||
52 | /* In ld.so __environ is not exported. */ | |
53 | extern char **__environ attribute_hidden; | |
54 | ||
55 | int | |
56 | unsetenv (const char *name) | |
57 | { | |
58 | char **ep; | |
59 | ||
60 | ep = __environ; | |
61 | while (*ep != NULL) | |
62 | { | |
63 | size_t cnt = 0; | |
64 | ||
65 | while ((*ep)[cnt] == name[cnt] && name[cnt] != '\0') | |
66 | ++cnt; | |
67 | ||
68 | if (name[cnt] == '\0' && (*ep)[cnt] == '=') | |
69 | { | |
70 | /* Found it. Remove this pointer by moving later ones to | |
71 | the front. */ | |
72 | char **dp = ep; | |
73 | ||
74 | do | |
75 | dp[0] = dp[1]; | |
76 | while (*dp++); | |
77 | /* Continue the loop in case NAME appears again. */ | |
78 | } | |
79 | else | |
80 | ++ep; | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } |