1 /* Copyright (C) 1991, 1994, 1997, 1998, 2000, 2003 Free Software Foundation, Inc.
3 NOTE: The canonical source of this file is maintained with the GNU C
4 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 /* Include errno.h *after* sys/types.h to work around header problems
33 # define __set_errno(ev) ((errno) = (ev))
36 /* Don't include stdlib.h because some (e.g., Solaris 7) declare putenv
37 with a non-const argument. That would conflict with the declaration of
38 rpl_putenv below (due to the #define putenv rpl_putenv from config.h). */
43 #if defined (__GNU_LIBRARY__) || defined (HAVE_STRING_H)
46 #if defined (__GNU_LIBRARY__) || defined (HAVE_UNISTD_H)
50 #if !defined (__GNU_LIBRARY__) && !defined (HAVE_STRCHR)
53 #if !defined (__GNU_LIBRARY__) && !defined (HAVE_MEMCPY)
54 # define memcpy(d,s,n) bcopy ((s), (d), (n))
58 # define environ __environ
60 extern char **environ;
64 /* This lock protects against simultaneous modifications of `environ'. */
65 # include <bits/libc-lock.h>
66 __libc_lock_define_initialized (static, envlock)
67 # define LOCK __libc_lock_lock (envlock)
68 # define UNLOCK __libc_lock_unlock (envlock)
79 unsetenv (const char *name)
84 if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
96 if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
98 /* Found it. Remove this pointer by moving later ones back. */
104 /* Continue the loop in case NAME appears again. */
115 /* Put STRING, which is of the form "NAME=VALUE", in the environment.
116 If STRING contains no `=', then remove STRING from the environment. */
118 rpl_putenv (const char *string)
120 const char *const name_end = strchr (string, '=');
121 register size_t size;
124 if (name_end == NULL)
126 /* Remove the variable from the environment. */
127 return unsetenv (string);
131 for (ep = environ; *ep != NULL; ++ep)
132 if (!strncmp (*ep, string, name_end - string) &&
133 (*ep)[name_end - string] == '=')
140 static char **last_environ = NULL;
141 char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
142 if (new_environ == NULL)
144 (void) memcpy ((void *) new_environ, (void *) environ,
145 size * sizeof (char *));
146 new_environ[size] = (char *) string;
147 new_environ[size + 1] = NULL;
148 if (last_environ != NULL)
150 last_environ = new_environ;
151 environ = new_environ;
154 *ep = (char *) string;