| 1 | /* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2012 Free Software
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| 2 | Foundation, Inc.
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| 3 |
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| 4 | NOTE: The canonical source of this file is maintained with the GNU C
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| 5 | Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
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| 6 |
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| 7 | This program is free software: you can redistribute it and/or modify it
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| 8 | under the terms of the GNU General Public License as published by the
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| 9 | Free Software Foundation; either version 3 of the License, or any
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| 10 | later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 19 |
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| 20 | #include <config.h>
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| 21 |
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| 22 | /* Specification. */
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| 23 | #include <stdlib.h>
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| 24 |
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| 25 | #include <stddef.h>
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| 26 |
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| 27 | /* Include errno.h *after* sys/types.h to work around header problems
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| 28 | on AIX 3.2.5. */
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| 29 | #include <errno.h>
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| 30 | #ifndef __set_errno
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| 31 | # define __set_errno(ev) ((errno) = (ev))
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| 32 | #endif
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| 33 |
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| 34 | #include <string.h>
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| 35 | #include <unistd.h>
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| 36 |
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| 37 | #if _LIBC
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| 38 | # if HAVE_GNU_LD
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| 39 | # define environ __environ
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| 40 | # else
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| 41 | extern char **environ;
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| 42 | # endif
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| 43 | #endif
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| 44 |
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| 45 | #if _LIBC
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| 46 | /* This lock protects against simultaneous modifications of 'environ'. */
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| 47 | # include <bits/libc-lock.h>
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| 48 | __libc_lock_define_initialized (static, envlock)
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| 49 | # define LOCK __libc_lock_lock (envlock)
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| 50 | # define UNLOCK __libc_lock_unlock (envlock)
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| 51 | #else
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| 52 | # define LOCK
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| 53 | # define UNLOCK
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| 54 | #endif
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| 55 |
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| 56 | static int
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| 57 | _unsetenv (const char *name)
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| 58 | {
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| 59 | size_t len;
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| 60 | char **ep;
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| 61 |
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| 62 | if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
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| 63 | {
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| 64 | __set_errno (EINVAL);
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| 65 | return -1;
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| 66 | }
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| 67 |
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| 68 | len = strlen (name);
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| 69 |
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| 70 | LOCK;
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| 71 |
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| 72 | ep = environ;
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| 73 | while (*ep != NULL)
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| 74 | if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
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| 75 | {
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| 76 | /* Found it. Remove this pointer by moving later ones back. */
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| 77 | char **dp = ep;
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| 78 |
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| 79 | do
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| 80 | dp[0] = dp[1];
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| 81 | while (*dp++);
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| 82 | /* Continue the loop in case NAME appears again. */
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| 83 | }
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| 84 | else
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| 85 | ++ep;
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| 86 |
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| 87 | UNLOCK;
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| 88 |
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| 89 | return 0;
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| 90 | }
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| 91 |
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| 92 |
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| 93 | /* Put STRING, which is of the form "NAME=VALUE", in the environment.
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| 94 | If STRING contains no '=', then remove STRING from the environment. */
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| 95 | int
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| 96 | putenv (char *string)
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| 97 | {
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| 98 | const char *const name_end = strchr (string, '=');
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| 99 | register size_t size;
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| 100 | register char **ep;
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| 101 |
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| 102 | if (name_end == NULL)
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| 103 | {
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| 104 | /* Remove the variable from the environment. */
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| 105 | return _unsetenv (string);
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| 106 | }
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| 107 |
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| 108 | size = 0;
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| 109 | for (ep = environ; *ep != NULL; ++ep)
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| 110 | if (!strncmp (*ep, string, name_end - string) &&
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| 111 | (*ep)[name_end - string] == '=')
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| 112 | break;
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| 113 | else
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| 114 | ++size;
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| 115 |
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| 116 | if (*ep == NULL)
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| 117 | {
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| 118 | static char **last_environ = NULL;
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| 119 | char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
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| 120 | if (new_environ == NULL)
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| 121 | return -1;
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| 122 | (void) memcpy ((void *) new_environ, (void *) environ,
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| 123 | size * sizeof (char *));
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| 124 | new_environ[size] = (char *) string;
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| 125 | new_environ[size + 1] = NULL;
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| 126 | free (last_environ);
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| 127 | last_environ = new_environ;
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| 128 | environ = new_environ;
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| 129 | }
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| 130 | else
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| 131 | *ep = string;
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| 132 |
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| 133 | return 0;
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| 134 | }
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