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+/* Copyright (C) 1992, 1995-2003, 2005-2010 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ This program is free software: you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 3 of the License, or
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+ (at your option) any later version.
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+
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+ This program 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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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
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+
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+#if !_LIBC
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+# include <config.h>
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+#endif
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+
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+/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
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+ optimizes away the name == NULL test below. */
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+#define _GL_ARG_NONNULL(params)
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+
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+#include <alloca.h>
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+
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+/* Specification. */
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+#include <stdlib.h>
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+
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+#include <errno.h>
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+#ifndef __set_errno
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+# define __set_errno(ev) ((errno) = (ev))
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+#endif
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+
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+#include <string.h>
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+#if _LIBC || HAVE_UNISTD_H
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+# include <unistd.h>
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+#endif
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+
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+#if !_LIBC
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+# include "malloca.h"
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+#endif
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+
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+#if _LIBC || !HAVE_SETENV
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+
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+#if !_LIBC
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+# define __environ environ
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+#endif
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+
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+#if _LIBC
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+/* This lock protects against simultaneous modifications of `environ'. */
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+# include <bits/libc-lock.h>
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+__libc_lock_define_initialized (static, envlock)
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+# define LOCK __libc_lock_lock (envlock)
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+# define UNLOCK __libc_lock_unlock (envlock)
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+#else
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+# define LOCK
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+# define UNLOCK
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+#endif
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+
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+/* In the GNU C library we must keep the namespace clean. */
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+#ifdef _LIBC
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+# define setenv __setenv
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+# define clearenv __clearenv
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+# define tfind __tfind
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+# define tsearch __tsearch
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+#else
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+/* Use the system functions, not the gnulib overrides in this file. */
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+# undef malloc
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+# undef realloc
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+#endif
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+
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+/* In the GNU C library implementation we try to be more clever and
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+ allow arbitrarily many changes of the environment given that the used
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+ values are from a small set. Outside glibc this will eat up all
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+ memory after a while. */
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+#if defined _LIBC || (defined HAVE_SEARCH_H && defined HAVE_TSEARCH \
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+ && defined __GNUC__)
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+# define USE_TSEARCH 1
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+# include <search.h>
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+typedef int (*compar_fn_t) (const void *, const void *);
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+
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+/* This is a pointer to the root of the search tree with the known
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+ values. */
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+static void *known_values;
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+
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+# define KNOWN_VALUE(Str) \
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+ ({ \
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+ void *value = tfind (Str, &known_values, (compar_fn_t) strcmp); \
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+ value != NULL ? *(char **) value : NULL; \
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+ })
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+# define STORE_VALUE(Str) \
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+ tsearch (Str, &known_values, (compar_fn_t) strcmp)
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+
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+#else
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+# undef USE_TSEARCH
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+
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+# define KNOWN_VALUE(Str) NULL
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+# define STORE_VALUE(Str) do { } while (0)
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+
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+#endif
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+
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+
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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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+static char **last_environ;
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+
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+
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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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+ 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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+ to reuse values once generated for a `setenv' call since we can never
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+ free the strings. */
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+int
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+__add_to_environ (const char *name, const char *value, const char *combined,
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+ int replace)
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+{
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+ char **ep;
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+ size_t size;
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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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+
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+ LOCK;
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+
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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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+ ep = __environ;
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+
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+ size = 0;
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+ if (ep != NULL)
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+ {
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+ for (; *ep != NULL; ++ep)
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+ if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
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+ break;
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+ else
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+ ++size;
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+ }
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+
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+ if (ep == NULL || *ep == NULL)
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+ {
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+ char **new_environ;
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+#ifdef USE_TSEARCH
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+ char *new_value;
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+#endif
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+
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+ /* We allocated this space; we can extend it. */
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+ new_environ =
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+ (char **) (last_environ == NULL
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+ ? malloc ((size + 2) * sizeof (char *))
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+ : realloc (last_environ, (size + 2) * sizeof (char *)));
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+ if (new_environ == NULL)
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+ {
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+ /* It's easier to set errno to ENOMEM than to rely on the
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+ 'malloc-posix' and 'realloc-posix' gnulib modules. */
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+ __set_errno (ENOMEM);
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+ UNLOCK;
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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 (combined != NULL)
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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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+ new_environ[size] = (char *) combined;
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+ else
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+ {
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+ /* See whether the value is already known. */
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+#ifdef USE_TSEARCH
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+# ifdef _LIBC
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+ new_value = (char *) alloca (namelen + 1 + vallen);
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+ __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
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+ value, vallen);
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+# else
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+ new_value = (char *) malloca (namelen + 1 + vallen);
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+ if (new_value == NULL)
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+ {
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+ __set_errno (ENOMEM);
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+ UNLOCK;
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+ return -1;
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+ }
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+ memcpy (new_value, name, namelen);
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+ new_value[namelen] = '=';
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+ memcpy (&new_value[namelen + 1], value, vallen);
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+# endif
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+
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+ new_environ[size] = KNOWN_VALUE (new_value);
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+ if (new_environ[size] == NULL)
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+#endif
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+ {
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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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+ {
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+#if defined USE_TSEARCH && !defined _LIBC
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+ freea (new_value);
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+#endif
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+ __set_errno (ENOMEM);
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+ UNLOCK;
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+ return -1;
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+ }
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+
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+#ifdef USE_TSEARCH
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+ memcpy (new_environ[size], new_value, namelen + 1 + vallen);
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+#else
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+ memcpy (new_environ[size], name, 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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+#endif
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+ /* And save the value now. We cannot do this when we remove
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+ the string since then we cannot decide whether it is a
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+ user string or not. */
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+ STORE_VALUE (new_environ[size]);
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+ }
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+#if defined USE_TSEARCH && !defined _LIBC
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+ freea (new_value);
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+#endif
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+ }
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+
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+ if (__environ != last_environ)
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+ memcpy ((char *) new_environ, (char *) __environ,
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+ size * sizeof (char *));
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+
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+ new_environ[size + 1] = NULL;
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+
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+ last_environ = __environ = new_environ;
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+ }
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+ else if (replace)
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+ {
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+ char *np;
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+
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+ /* Use the user string if given. */
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+ if (combined != NULL)
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+ np = (char *) combined;
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+ else
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+ {
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+#ifdef USE_TSEARCH
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+ char *new_value;
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+# ifdef _LIBC
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+ new_value = alloca (namelen + 1 + vallen);
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+ __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
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+ value, vallen);
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+# else
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+ new_value = malloca (namelen + 1 + vallen);
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+ if (new_value == NULL)
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+ {
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+ __set_errno (ENOMEM);
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+ UNLOCK;
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+ return -1;
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+ }
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+ memcpy (new_value, name, namelen);
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+ new_value[namelen] = '=';
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+ memcpy (&new_value[namelen + 1], value, vallen);
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+# endif
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+
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+ np = KNOWN_VALUE (new_value);
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+ if (np == NULL)
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+#endif
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+ {
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+ np = (char *) malloc (namelen + 1 + vallen);
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+ if (np == NULL)
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+ {
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+#if defined USE_TSEARCH && !defined _LIBC
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+ freea (new_value);
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+#endif
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+ __set_errno (ENOMEM);
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+ UNLOCK;
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+ return -1;
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+ }
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+
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+#ifdef USE_TSEARCH
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+ memcpy (np, new_value, namelen + 1 + vallen);
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+#else
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+ memcpy (np, name, namelen);
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+ np[namelen] = '=';
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+ memcpy (&np[namelen + 1], value, vallen);
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+#endif
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+ /* And remember the value. */
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+ STORE_VALUE (np);
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+ }
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+#if defined USE_TSEARCH && !defined _LIBC
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+ freea (new_value);
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+#endif
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+ }
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+
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+ *ep = np;
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+ }
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+
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+ UNLOCK;
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+
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+ return 0;
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+}
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+
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+int
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+setenv (const char *name, const char *value, int replace)
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+{
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+ if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
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+ {
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+ __set_errno (EINVAL);
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+ return -1;
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+ }
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+
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+ return __add_to_environ (name, value, NULL, replace);
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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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+ never made it. Nevertheless the POSIX.9 standard (POSIX bindings
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+ for Fortran 77) requires this function. */
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+int
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+clearenv (void)
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+{
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+ LOCK;
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+
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+ if (__environ == last_environ && __environ != NULL)
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+ {
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+ /* We allocated this environment so we can free it. */
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+ free (__environ);
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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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+ __environ = NULL;
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+
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+ UNLOCK;
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+
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+ return 0;
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+}
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+
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+#ifdef _LIBC
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+static void
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+free_mem (void)
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+{
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+ /* Remove all traces. */
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+ clearenv ();
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+
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+ /* Now remove the search tree. */
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+ __tdestroy (known_values, free);
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+ known_values = NULL;
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+}
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+text_set_element (__libc_subfreeres, free_mem);
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+
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+
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+# undef setenv
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+# undef clearenv
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+weak_alias (__setenv, setenv)
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+weak_alias (__clearenv, clearenv)
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+#endif
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+
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+#endif /* _LIBC || !HAVE_SETENV */
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+
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+/* The rest of this file is called into use when replacing an existing
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+ but buggy setenv. Known bugs include failure to diagnose invalid
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+ name, and consuming a leading '=' from value. */
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+#if HAVE_SETENV
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+
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+# undef setenv
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+# define STREQ(a, b) (strcmp (a, b) == 0)
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+
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+int
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+rpl_setenv (const char *name, const char *value, int replace)
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+{
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+ int result;
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+ if (!name || !*name || strchr (name, '='))
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+ {
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+ errno = EINVAL;
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+ return -1;
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+ }
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+ /* Call the real setenv even if replace is 0, in case implementation
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+ has underlying data to update, such as when environ changes. */
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+ result = setenv (name, value, replace);
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+ if (result == 0 && replace && *value == '=')
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+ {
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+ char *tmp = getenv (name);
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+ if (!STREQ (tmp, value))
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+ {
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+ int saved_errno;
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+ size_t len = strlen (value);
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+ tmp = malloca (len + 2);
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+ /* Since leading '=' is eaten, double it up. */
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+ *tmp = '=';
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+ memcpy (tmp + 1, value, len + 1);
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+ result = setenv (name, tmp, replace);
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+ saved_errno = errno;
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+ freea (tmp);
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+ errno = saved_errno;
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+ }
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+ }
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+ return result;
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+}
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+
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+#endif /* HAVE_SETENV */
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Ton Voon