-/* Copyright (C) 1991, 1994, 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2014 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.
- This program is free software; you can redistribute it and/or modify it
+ 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
+ Free Software Foundation; either version 3 of the License, or any
later version.
This program is distributed in the hope that it will be useful,
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, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#include <errno.h>
-
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
-/* Disable the definition of putenv to rpl_putenv (from config.h) in this
- file. Otherwise, we'd get conflicting prototypes for rpl_putenv on
- systems like Irix 5.3. */
-#undef putenv
+/* Specification. */
+#include <stdlib.h>
-#include <sys/types.h>
+#include <stddef.h>
-#if defined (__GNU_LIBRARY__) || defined (HAVE_STDLIB_H)
-/* Some stdlib.h (e.g., Solaris 2.7) declare putenv with a non-const argument.
- Since that would conflict with the declaration below, we rename putenv in
- that incompatible prototype. */
-# define putenv vendor_putenv_prototype
-# include <stdlib.h>
-# undef putenv
+/* 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>
+#include <string.h>
+#include <unistd.h>
+
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
#endif
-#if defined (__GNU_LIBRARY__) || defined (HAVE_UNISTD_H)
-# include <unistd.h>
+
+#if _LIBC
+# if HAVE_GNU_LD
+# define environ __environ
+# else
+extern char **environ;
+# endif
#endif
-#if !defined (__GNU_LIBRARY__) && !defined (HAVE_STRCHR)
-# define strchr index
+#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
-#if !defined (__GNU_LIBRARY__) && !defined (HAVE_MEMCPY)
-# define memcpy(d,s,n) bcopy ((s), (d), (n))
+
+static int
+_unsetenv (const char *name)
+{
+ size_t len;
+#if !HAVE_DECL__PUTENV
+ char **ep;
#endif
-#if HAVE_GNU_LD
-# define environ __environ
+ 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
-extern char **environ;
-#endif
-#ifndef NULL
-# define NULL 0
+ 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
+}
-/* 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
-rpl_putenv (const char *string)
+putenv (char *string)
{
- const char *const name_end = strchr (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) memcpy ((void *) new_environ, (void *) environ,
- size * sizeof (char *));
- new_environ[size] = (char *) string;
- new_environ[size + 1] = NULL;
- if (last_environ != NULL)
- free ((void *) 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