-/* Copyright (C) 1991 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
-
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
-
-The GNU C Library 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
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
-
-#ifdef HAVE_CONFIG_H
-#if defined (CONFIG_BROKETS)
-/* We use <config.h> instead of "config.h" so that a compilation
- using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
- (which it would do because it found this file in $srcdir). */
-#include <config.h>
-#else
-#include "config.h"
-#endif
-#endif
+/* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2014 Free Software
+ Foundation, Inc.
-#include <sys/types.h>
-#include <errno.h>
+ 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 needs to come after some library #include
- to get __GNU_LIBRARY__ defined. */
-#ifdef __GNU_LIBRARY__
-/* Don't include stdlib.h for non-GNU C libraries because some of them
- contain conflicting prototypes for getopt. */
+ 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/>. */
+
+#include <config.h>
+
+/* Specification. */
#include <stdlib.h>
-#else
-char *malloc ();
-#endif /* GNU C library. */
-#ifndef STDC_HEADERS
-extern int errno;
+#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(STDC_HEADERS) || defined(HAVE_STRING_H)
#include <string.h>
-#ifndef index
-#define index strchr
+#include <unistd.h>
+
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
#endif
-#ifndef bcopy
-#define bcopy(s, d, n) memcpy((d), (s), (n))
+
+#if _LIBC
+# if HAVE_GNU_LD
+# define environ __environ
+# else
+extern char **environ;
+# endif
#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
-#include <strings.h>
+# define LOCK
+# define UNLOCK
#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
+static int
+_unsetenv (const char *name)
+{
+ size_t len;
+#if !HAVE_DECL__PUTENV
+ char **ep;
#endif
-#ifndef NULL
-#define NULL 0
+ if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ len = strlen (name);
+
+#if HAVE_DECL__PUTENV
+ {
+ int putenv_result, putenv_errno;
+ char *name_ = malloc (len + 2);
+ memcpy (name_, name, len);
+ name_[len] = '=';
+ name_[len + 1] = 0;
+ putenv_result = _putenv (name_);
+ putenv_errno = errno;
+ free (name_);
+ __set_errno (putenv_errno);
+ return putenv_result;
+ }
+#else
+
+ 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;
#endif
+}
-extern char **environ;
-/* 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)
{
- char *name_end = index (string, '=');
- register size_t size;
- register char **ep;
+ const char *name_end = strchr (string, '=');
+ char **ep;
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] == '=')
+#if HAVE_DECL__PUTENV
+ /* Rely on _putenv to allocate the new environment. If other
+ parts of the application use _putenv, the !HAVE_DECL__PUTENV code
+ would fight over who owns the environ vector, causing a crash. */
+ if (name_end[1])
+ return _putenv (string);
+ else
+ {
+ /* _putenv ("NAME=") unsets NAME, so invoke _putenv ("NAME= ")
+ to allocate the environ vector and then replace the new
+ entry with "NAME=". */
+ int putenv_result, putenv_errno;
+ char *name_x = malloc (name_end - string + sizeof "= ");
+ if (!name_x)
+ return -1;
+ memcpy (name_x, string, name_end - string + 1);
+ name_x[name_end - string + 1] = ' ';
+ name_x[name_end - string + 2] = 0;
+ putenv_result = _putenv (name_x);
+ putenv_errno = errno;
+ for (ep = environ; *ep; ep++)
+ if (strcmp (*ep, name_x) == 0)
+ {
+ *ep = string;
+ break;
+ }
+# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+ if (putenv_result == 0)
+ {
+ /* _putenv propagated "NAME= " into the subprocess environment;
+ fix that by calling SetEnvironmentVariable directly. */
+ name_x[name_end - string] = 0;
+ putenv_result = SetEnvironmentVariable (name_x, "") ? 0 : -1;
+ putenv_errno = ENOMEM; /* ENOMEM is the only way to fail. */
+ }
+# endif
+ free (name_x);
+ __set_errno (putenv_errno);
+ return putenv_result;
+ }
+#else
+ for (ep = environ; *ep; ep++)
+ if (strncmp (*ep, string, name_end - string) == 0
+ && (*ep)[name_end - string] == '=')
break;
- else
- ++size;
- if (*ep == NULL)
+ if (*ep)
+ *ep = string;
+ else
{
static char **last_environ = NULL;
- char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
- if (new_environ == NULL)
- return -1;
- (void) bcopy ((char *) environ, (char *) new_environ,
- size * sizeof (char *));
- new_environ[size] = (char *) string;
- new_environ[size + 1] = NULL;
- if (last_environ != NULL)
- free ((char *) last_environ);
+ size_t size = ep - environ;
+ char **new_environ = malloc ((size + 2) * sizeof *new_environ);
+ if (! new_environ)
+ return -1;
+ new_environ[0] = string;
+ memcpy (new_environ + 1, environ, (size + 1) * sizeof *new_environ);
+ free (last_environ);
last_environ = new_environ;
environ = new_environ;
}
- else
- *ep = (char *) string;
return 0;
+#endif
}
projects / gnulib.git / blobdiff