-/* Copyright (C) 1991, 1994 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2011 Free Software
+ Foundation, Inc.
+ NOTE: The canonical source of this file is maintained with the GNU C
+ Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
-NOTE: The canonical source of this file is maintained with the GNU C Library.
-Bugs can be reported to bug-glibc@prep.ai.mit.edu.
+ This program is free software: you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 3 of the License, or any
+ later version.
-This program is free software; you can redistribute it and/or modify it
-under the terms of the GNU General Public License as published by the
-Free Software Foundation; either version 2, or (at your option) any
-later version.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-#include <errno.h>
-
-#ifdef HAVE_CONFIG_H
#include <config.h>
-#endif
-#if defined (__GNU_LIBRARY__) || defined (HAVE_STDLIB_H)
+/* Specification. */
#include <stdlib.h>
+
+#include <stddef.h>
+
+/* Include errno.h *after* sys/types.h to work around header problems
+ on AIX 3.2.5. */
+#include <errno.h>
+#ifndef __set_errno
+# define __set_errno(ev) ((errno) = (ev))
#endif
-#if defined (__GNU_LIBRARY__) || defined (HAVE_STRING_H)
+
#include <string.h>
-#endif
-#if defined (__GNU_LIBRARY__) || defined (HAVE_UNISTD_H)
#include <unistd.h>
-#endif
-
-#if !defined (__GNU_LIBRARY__) && !defined (HAVE_STRCHR)
-#define strchr index
-#endif
-#if !defined (__GNU_LIBRARY__) && !defined (HAVE_MEMCPY)
-#define memcpy(d,s,n) bcopy ((s), (d), (n))
-#endif
#if HAVE_GNU_LD
-#define environ __environ
+# define environ __environ
#else
extern char **environ;
#endif
+#if _LIBC
+/* This lock protects against simultaneous modifications of `environ'. */
+# include <bits/libc-lock.h>
+__libc_lock_define_initialized (static, envlock)
+# define LOCK __libc_lock_lock (envlock)
+# define UNLOCK __libc_lock_unlock (envlock)
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+static int
+_unsetenv (const char *name)
+{
+ size_t len;
+ char **ep;
+
+ if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ len = strlen (name);
+
+ LOCK;
+
+ ep = environ;
+ while (*ep != NULL)
+ if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
+ {
+ /* Found it. Remove this pointer by moving later ones back. */
+ char **dp = ep;
+
+ do
+ dp[0] = dp[1];
+ while (*dp++);
+ /* Continue the loop in case NAME appears again. */
+ }
+ else
+ ++ep;
+
+ UNLOCK;
+
+ return 0;
+}
+
-/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
+/* Put STRING, which is of the form "NAME=VALUE", in the environment.
+ If STRING contains no `=', then remove STRING from the environment. */
int
-putenv (string)
- const char *string;
+putenv (char *string)
{
const char *const name_end = strchr (string, '=');
register size_t size;
if (name_end == NULL)
{
/* Remove the variable from the environment. */
- size = strlen (string);
- for (ep = environ; *ep != NULL; ++ep)
- if (!strncmp (*ep, string, size) && (*ep)[size] == '=')
- {
- while (ep[1] != NULL)
- {
- ep[0] = ep[1];
- ++ep;
- }
- *ep = NULL;
- return 0;
- }
+ return _unsetenv (string);
}
size = 0;
for (ep = environ; *ep != NULL; ++ep)
if (!strncmp (*ep, string, name_end - string) &&
- (*ep)[name_end - string] == '=')
+ (*ep)[name_end - string] == '=')
break;
else
++size;
static char **last_environ = NULL;
char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
if (new_environ == NULL)
- return -1;
+ return -1;
(void) memcpy ((void *) new_environ, (void *) environ,
- size * sizeof (char *));
+ size * sizeof (char *));
new_environ[size] = (char *) string;
new_environ[size + 1] = NULL;
- if (last_environ != NULL)
- free ((void *) last_environ);
+ free (last_environ);
last_environ = new_environ;
environ = new_environ;
}
else
- *ep = (char *) string;
+ *ep = string;
return 0;
}