-/* Copyright (C) 1992,1995-1999,2000-2003 Free Software Foundation, Inc.
+/* Copyright (C) 1992, 1995-2003, 2005-2014 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.
+ 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
+ (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
+ 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
- Library General Public License for more details.
+ 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 Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#if HAVE_CONFIG_H
+#if !_LIBC
+/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
+ optimizes away the name == NULL test below. */
+# define _GL_ARG_NONNULL(params)
+
+# define _GL_USE_STDLIB_ALLOC 1
# include <config.h>
#endif
#include <alloca.h>
+/* Specification. */
+#include <stdlib.h>
+
#include <errno.h>
-#if !_LIBC
-# if !defined errno && !defined HAVE_ERRNO_DECL
-extern int errno;
-# endif
+#ifndef __set_errno
# define __set_errno(ev) ((errno) = (ev))
#endif
-#if _LIBC || HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
-#if _LIBC || HAVE_STRING_H
-# include <string.h>
-#endif
+#include <string.h>
#if _LIBC || HAVE_UNISTD_H
# include <unistd.h>
#endif
-/* For those losing systems which don't have 'alloca' we have to add
- some additional code emulating it. */
-#if _LIBC || HAVE_ALLOCA
-# define freea(p) /* nothing */
-#else
-# define alloca(n) malloc (n)
-# define freea(p) free (p)
+#if !_LIBC
+# include "malloca.h"
#endif
+#if _LIBC || !HAVE_SETENV
+
#if !_LIBC
-# define __environ environ
-# ifndef HAVE_ENVIRON_DECL
-extern char **environ;
-# endif
+# define __environ environ
#endif
#if _LIBC
-/* This lock protects against simultaneous modifications of `environ'. */
+/* 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)
+# define LOCK __libc_lock_lock (envlock)
+# define UNLOCK __libc_lock_unlock (envlock)
#else
# define LOCK
# define UNLOCK
values are from a small set. Outside glibc this will eat up all
memory after a while. */
#if defined _LIBC || (defined HAVE_SEARCH_H && defined HAVE_TSEARCH \
- && defined __GNUC__)
-# define USE_TSEARCH 1
+ && defined __GNUC__)
+# define USE_TSEARCH 1
# include <search.h>
typedef int (*compar_fn_t) (const void *, const void *);
static void *known_values;
# define KNOWN_VALUE(Str) \
- ({ \
- void *value = tfind (Str, &known_values, (compar_fn_t) strcmp); \
- value != NULL ? *(char **) value : NULL; \
+ ({ \
+ void *value = tfind (Str, &known_values, (compar_fn_t) strcmp); \
+ value != NULL ? *(char **) value : NULL; \
})
# define STORE_VALUE(Str) \
tsearch (Str, &known_values, (compar_fn_t) strcmp)
static char **last_environ;
-/* This function is used by `setenv' and `putenv'. The difference between
+/* This function is used by 'setenv' and 'putenv'. The difference between
the two functions is that for the former must create a new string which
- is then placed in the environment, while the argument of `putenv'
+ is then placed in the environment, while the argument of 'putenv'
must be used directly. This is all complicated by the fact that we try
- to reuse values once generated for a `setenv' call since we can never
+ to reuse values once generated for a 'setenv' call since we can never
free the strings. */
int
__add_to_environ (const char *name, const char *value, const char *combined,
- int replace)
+ int replace)
{
- register char **ep;
- register size_t size;
+ char **ep;
+ size_t size;
const size_t namelen = strlen (name);
const size_t vallen = value != NULL ? strlen (value) + 1 : 0;
if (ep != NULL)
{
for (; *ep != NULL; ++ep)
- if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
- break;
- else
- ++size;
+ if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
+ break;
+ else
+ ++size;
}
if (ep == NULL || *ep == NULL)
/* We allocated this space; we can extend it. */
new_environ =
- (char **) (last_environ == NULL
- ? malloc ((size + 2) * sizeof (char *))
- : realloc (last_environ, (size + 2) * sizeof (char *)));
+ (char **) (last_environ == NULL
+ ? malloc ((size + 2) * sizeof (char *))
+ : realloc (last_environ, (size + 2) * sizeof (char *)));
if (new_environ == NULL)
- {
- UNLOCK;
- return -1;
- }
+ {
+ /* It's easier to set errno to ENOMEM than to rely on the
+ 'malloc-posix' and 'realloc-posix' gnulib modules. */
+ __set_errno (ENOMEM);
+ UNLOCK;
+ return -1;
+ }
/* If the whole entry is given add it. */
if (combined != NULL)
- /* We must not add the string to the search tree since it belongs
- to the user. */
- new_environ[size] = (char *) combined;
+ /* We must not add the string to the search tree since it belongs
+ to the user. */
+ new_environ[size] = (char *) combined;
else
- {
- /* See whether the value is already known. */
+ {
+ /* See whether the value is already known. */
#ifdef USE_TSEARCH
- new_value = (char *) alloca (namelen + 1 + vallen);
# ifdef _LIBC
- __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
- value, vallen);
+ new_value = (char *) alloca (namelen + 1 + vallen);
+ __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
+ value, vallen);
# else
- memcpy (new_value, name, namelen);
- new_value[namelen] = '=';
- memcpy (&new_value[namelen + 1], value, vallen);
+ new_value = (char *) malloca (namelen + 1 + vallen);
+ if (new_value == NULL)
+ {
+ __set_errno (ENOMEM);
+ UNLOCK;
+ return -1;
+ }
+ memcpy (new_value, name, namelen);
+ new_value[namelen] = '=';
+ memcpy (&new_value[namelen + 1], value, vallen);
# endif
- new_environ[size] = KNOWN_VALUE (new_value);
- if (new_environ[size] == NULL)
+ new_environ[size] = KNOWN_VALUE (new_value);
+ if (new_environ[size] == NULL)
#endif
- {
- new_environ[size] = (char *) malloc (namelen + 1 + vallen);
- if (new_environ[size] == NULL)
- {
-#ifdef USE_TSEARCH
- freea (new_value);
+ {
+ new_environ[size] = (char *) malloc (namelen + 1 + vallen);
+ if (new_environ[size] == NULL)
+ {
+#if defined USE_TSEARCH && !defined _LIBC
+ freea (new_value);
#endif
- __set_errno (ENOMEM);
- UNLOCK;
- return -1;
- }
+ __set_errno (ENOMEM);
+ UNLOCK;
+ return -1;
+ }
#ifdef USE_TSEARCH
- memcpy (new_environ[size], new_value, namelen + 1 + vallen);
+ memcpy (new_environ[size], new_value, namelen + 1 + vallen);
#else
- memcpy (new_environ[size], name, namelen);
- new_environ[size][namelen] = '=';
- memcpy (&new_environ[size][namelen + 1], value, vallen);
+ memcpy (new_environ[size], name, namelen);
+ new_environ[size][namelen] = '=';
+ memcpy (&new_environ[size][namelen + 1], value, vallen);
#endif
- /* And save the value now. We cannot do this when we remove
- the string since then we cannot decide whether it is a
- user string or not. */
- STORE_VALUE (new_environ[size]);
- }
-#ifdef USE_TSEARCH
- freea (new_value);
+ /* And save the value now. We cannot do this when we remove
+ the string since then we cannot decide whether it is a
+ user string or not. */
+ STORE_VALUE (new_environ[size]);
+ }
+#if defined USE_TSEARCH && !defined _LIBC
+ freea (new_value);
#endif
- }
+ }
if (__environ != last_environ)
- memcpy ((char *) new_environ, (char *) __environ,
- size * sizeof (char *));
+ memcpy ((char *) new_environ, (char *) __environ,
+ size * sizeof (char *));
new_environ[size + 1] = NULL;
/* Use the user string if given. */
if (combined != NULL)
- np = (char *) combined;
+ np = (char *) combined;
else
- {
+ {
#ifdef USE_TSEARCH
- char *new_value = alloca (namelen + 1 + vallen);
+ char *new_value;
# ifdef _LIBC
- __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
- value, vallen);
+ new_value = alloca (namelen + 1 + vallen);
+ __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
+ value, vallen);
# else
- memcpy (new_value, name, namelen);
- new_value[namelen] = '=';
- memcpy (&new_value[namelen + 1], value, vallen);
+ new_value = malloca (namelen + 1 + vallen);
+ if (new_value == NULL)
+ {
+ __set_errno (ENOMEM);
+ UNLOCK;
+ return -1;
+ }
+ memcpy (new_value, name, namelen);
+ new_value[namelen] = '=';
+ memcpy (&new_value[namelen + 1], value, vallen);
# endif
- np = KNOWN_VALUE (new_value);
- if (np == NULL)
+ np = KNOWN_VALUE (new_value);
+ if (np == NULL)
#endif
- {
- np = malloc (namelen + 1 + vallen);
- if (np == NULL)
- {
-#ifdef USE_TSEARCH
- freea (new_value);
+ {
+ np = (char *) malloc (namelen + 1 + vallen);
+ if (np == NULL)
+ {
+#if defined USE_TSEARCH && !defined _LIBC
+ freea (new_value);
#endif
- UNLOCK;
- return -1;
- }
+ __set_errno (ENOMEM);
+ UNLOCK;
+ return -1;
+ }
#ifdef USE_TSEARCH
- memcpy (np, new_value, namelen + 1 + vallen);
+ memcpy (np, new_value, namelen + 1 + vallen);
#else
- memcpy (np, name, namelen);
- np[namelen] = '=';
- memcpy (&np[namelen + 1], value, vallen);
+ memcpy (np, name, namelen);
+ np[namelen] = '=';
+ memcpy (&np[namelen + 1], value, vallen);
#endif
- /* And remember the value. */
- STORE_VALUE (np);
- }
-#ifdef USE_TSEARCH
- freea (new_value);
+ /* And remember the value. */
+ STORE_VALUE (np);
+ }
+#if defined USE_TSEARCH && !defined _LIBC
+ freea (new_value);
#endif
- }
+ }
*ep = np;
}
int
setenv (const char *name, const char *value, int replace)
{
+ if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
return __add_to_environ (name, value, NULL, replace);
}
-/* The `clearenv' was planned to be added to POSIX.1 but probably
+/* The 'clearenv' was planned to be added to POSIX.1 but probably
never made it. Nevertheless the POSIX.9 standard (POSIX bindings
for Fortran 77) requires this function. */
int
-clearenv ()
+clearenv (void)
{
LOCK;
weak_alias (__setenv, setenv)
weak_alias (__clearenv, clearenv)
#endif
+
+#endif /* _LIBC || !HAVE_SETENV */
+
+/* The rest of this file is called into use when replacing an existing
+ but buggy setenv. Known bugs include failure to diagnose invalid
+ name, and consuming a leading '=' from value. */
+#if HAVE_SETENV
+
+# undef setenv
+# if !HAVE_DECL_SETENV
+extern int setenv (const char *, const char *, int);
+# endif
+# define STREQ(a, b) (strcmp (a, b) == 0)
+
+int
+rpl_setenv (const char *name, const char *value, int replace)
+{
+ int result;
+ if (!name || !*name || strchr (name, '='))
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ /* Call the real setenv even if replace is 0, in case implementation
+ has underlying data to update, such as when environ changes. */
+ result = setenv (name, value, replace);
+ if (result == 0 && replace && *value == '=')
+ {
+ char *tmp = getenv (name);
+ if (!STREQ (tmp, value))
+ {
+ int saved_errno;
+ size_t len = strlen (value);
+ tmp = malloca (len + 2);
+ /* Since leading '=' is eaten, double it up. */
+ *tmp = '=';
+ memcpy (tmp + 1, value, len + 1);
+ result = setenv (name, tmp, replace);
+ saved_errno = errno;
+ freea (tmp);
+ errno = saved_errno;
+ }
+ }
+ return result;
+}
+
+#endif /* HAVE_SETENV */
projects / gnulib.git / blobdiff