/* Copyright (C) 1992,95,96,97,98,99,2000,2001 Free Software Foundation, Inc.
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/* Copyright (C) 1992,95,96,97,98,99,2000,2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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02111-1307 USA.
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modified for uClibc by Erik Andersen <andersen@codepoet.org>
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modified for uClibc by Erik Andersen <andersen@codepoet.org>
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*/
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*/
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#define _GNU_SOURCE
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#define _GNU_SOURCE
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#include <features.h>
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#include <features.h>
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#include <errno.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <unistd.h>
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#include <unistd.h>
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#ifdef __UCLIBC_HAS_THREADS__
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#ifdef __UCLIBC_HAS_THREADS__
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#include <pthread.h>
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#include <pthread.h>
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static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
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static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
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# define LOCK __pthread_mutex_lock(&mylock)
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# define LOCK __pthread_mutex_lock(&mylock)
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# define UNLOCK __pthread_mutex_unlock(&mylock);
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# define UNLOCK __pthread_mutex_unlock(&mylock);
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#else
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#else
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# define LOCK
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# define LOCK
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# define UNLOCK
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# define UNLOCK
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#endif
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#endif
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/* If this variable is not a null pointer we allocated the current
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/* If this variable is not a null pointer we allocated the current
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environment. */
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environment. */
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static char **last_environ;
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static char **last_environ;
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/* This function is used by `setenv' and `putenv'. The difference between
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/* This function is used by `setenv' and `putenv'. The difference between
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the two functions is that for the former must create a new string which
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the two functions is that for the former must create a new string which
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is then placed in the environment, while the argument of `putenv'
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is then placed in the environment, while the argument of `putenv'
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must be used directly. This is all complicated by the fact that we try
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must be used directly. This is all complicated by the fact that we try
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to reuse values once generated for a `setenv' call since we can never
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to reuse values once generated for a `setenv' call since we can never
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free the strings. */
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free the strings. */
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int __add_to_environ (const char *name, const char *value,
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int __add_to_environ (const char *name, const char *value,
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const char *combined, int replace)
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const char *combined, int replace)
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{
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{
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register char **ep;
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register char **ep;
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register size_t size;
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register size_t size;
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const size_t namelen = strlen (name);
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const size_t namelen = strlen (name);
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const size_t vallen = value != NULL ? strlen (value) + 1 : 0;
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const size_t vallen = value != NULL ? strlen (value) + 1 : 0;
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LOCK;
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LOCK;
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/* We have to get the pointer now that we have the lock and not earlier
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/* We have to get the pointer now that we have the lock and not earlier
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since another thread might have created a new environment. */
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since another thread might have created a new environment. */
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ep = __environ;
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ep = __environ;
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size = 0;
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size = 0;
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if (ep != NULL) {
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if (ep != NULL) {
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for (; *ep != NULL; ++ep) {
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for (; *ep != NULL; ++ep) {
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if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
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if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
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break;
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break;
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else
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else
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++size;
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++size;
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}
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}
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}
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}
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if (ep == NULL || *ep == NULL) {
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if (ep == NULL || *ep == NULL) {
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char **new_environ;
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char **new_environ;
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/* We allocated this space; we can extend it. */
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/* We allocated this space; we can extend it. */
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new_environ = (char **) realloc (last_environ,
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new_environ = (char **) realloc (last_environ,
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(size + 2) * sizeof (char *));
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(size + 2) * sizeof (char *));
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if (new_environ == NULL) {
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if (new_environ == NULL) {
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UNLOCK;
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UNLOCK;
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return -1;
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return -1;
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}
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}
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/* If the whole entry is given add it. */
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/* If the whole entry is given add it. */
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if (combined != NULL) {
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if (combined != NULL) {
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/* We must not add the string to the search tree since it belongs
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/* We must not add the string to the search tree since it belongs
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to the user. */
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to the user. */
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new_environ[size] = (char *) combined;
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new_environ[size] = (char *) combined;
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} else {
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} else {
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/* See whether the value is already known. */
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/* See whether the value is already known. */
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new_environ[size] = (char *) malloc (namelen + 1 + vallen);
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new_environ[size] = (char *) malloc (namelen + 1 + vallen);
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if (new_environ[size] == NULL) {
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if (new_environ[size] == NULL) {
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__set_errno (ENOMEM);
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__set_errno (ENOMEM);
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UNLOCK;
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UNLOCK;
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return -1;
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return -1;
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}
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}
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memcpy (new_environ[size], name, namelen);
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memcpy (new_environ[size], name, namelen);
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new_environ[size][namelen] = '=';
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new_environ[size][namelen] = '=';
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memcpy (&new_environ[size][namelen + 1], value, vallen);
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memcpy (&new_environ[size][namelen + 1], value, vallen);
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}
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}
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if (__environ != last_environ) {
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if (__environ != last_environ) {
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memcpy ((char *) new_environ, (char *) __environ,
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memcpy ((char *) new_environ, (char *) __environ,
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size * sizeof (char *));
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size * sizeof (char *));
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}
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}
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new_environ[size + 1] = NULL;
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new_environ[size + 1] = NULL;
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last_environ = __environ = new_environ;
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last_environ = __environ = new_environ;
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} else if (replace) {
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} else if (replace) {
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char *np;
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char *np;
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/* Use the user string if given. */
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/* Use the user string if given. */
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if (combined != NULL) {
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if (combined != NULL) {
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np = (char *) combined;
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np = (char *) combined;
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} else {
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} else {
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np = malloc (namelen + 1 + vallen);
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np = malloc (namelen + 1 + vallen);
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if (np == NULL) {
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if (np == NULL) {
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UNLOCK;
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UNLOCK;
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return -1;
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return -1;
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}
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}
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memcpy (np, name, namelen);
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memcpy (np, name, namelen);
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np[namelen] = '=';
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np[namelen] = '=';
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memcpy (&np[namelen + 1], value, vallen);
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memcpy (&np[namelen + 1], value, vallen);
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}
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}
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*ep = np;
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*ep = np;
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}
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}
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UNLOCK;
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UNLOCK;
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return 0;
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return 0;
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}
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}
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int setenv (const char *name, const char *value, int replace)
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int setenv (const char *name, const char *value, int replace)
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{
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{
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return __add_to_environ (name, value, NULL, replace);
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return __add_to_environ (name, value, NULL, replace);
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}
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}
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int unsetenv (const char *name)
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int unsetenv (const char *name)
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{
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{
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size_t len;
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size_t len;
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char **ep;
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char **ep;
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if (name == NULL || *name == '\0' || strchr (name, '=') != NULL) {
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if (name == NULL || *name == '\0' || strchr (name, '=') != NULL) {
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__set_errno (EINVAL);
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__set_errno (EINVAL);
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return -1;
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return -1;
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}
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}
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len = strlen (name);
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len = strlen (name);
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LOCK;
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LOCK;
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ep = __environ;
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ep = __environ;
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while (*ep != NULL) {
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while (*ep != NULL) {
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if (!strncmp (*ep, name, len) && (*ep)[len] == '=') {
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if (!strncmp (*ep, name, len) && (*ep)[len] == '=') {
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/* Found it. Remove this pointer by moving later ones back. */
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/* Found it. Remove this pointer by moving later ones back. */
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char **dp = ep;
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char **dp = ep;
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do {
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do {
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dp[0] = dp[1];
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dp[0] = dp[1];
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} while (*dp++);
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} while (*dp++);
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/* Continue the loop in case NAME appears again. */
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/* Continue the loop in case NAME appears again. */
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} else {
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} else {
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++ep;
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++ep;
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}
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}
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}
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}
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UNLOCK;
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UNLOCK;
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return 0;
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return 0;
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}
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}
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/* The `clearenv' was planned to be added to POSIX.1 but probably
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/* The `clearenv' was planned to be added to POSIX.1 but probably
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never made it. Nevertheless the POSIX.9 standard (POSIX bindings
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never made it. Nevertheless the POSIX.9 standard (POSIX bindings
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for Fortran 77) requires this function. */
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for Fortran 77) requires this function. */
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int clearenv (void)
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int clearenv (void)
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{
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{
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LOCK;
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LOCK;
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if (__environ == last_environ && __environ != NULL) {
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if (__environ == last_environ && __environ != NULL) {
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/* We allocated this environment so we can free it. */
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/* We allocated this environment so we can free it. */
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free (__environ);
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free (__environ);
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last_environ = NULL;
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last_environ = NULL;
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}
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}
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/* Clear the environment pointer removes the whole environment. */
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/* Clear the environment pointer removes the whole environment. */
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__environ = NULL;
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__environ = NULL;
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UNLOCK;
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UNLOCK;
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return 0;
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return 0;
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}
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}
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/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
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/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
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int putenv (char *string)
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int putenv (char *string)
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{
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{
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int result;
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int result;
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const char *const name_end = strchr (string, '=');
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const char *const name_end = strchr (string, '=');
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if (name_end != NULL) {
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if (name_end != NULL) {
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char *name = strndup(string, name_end - string);
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char *name = strndup(string, name_end - string);
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result = __add_to_environ (name, NULL, string, 1);
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result = __add_to_environ (name, NULL, string, 1);
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free(name);
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free(name);
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return(result);
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return(result);
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}
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}
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unsetenv (string);
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unsetenv (string);
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return 0;
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return 0;
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}
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}
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