+++ /dev/null
-/* Copyright (C) 1992,1995-1999,2000-2003,2005-2008 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- 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.
-
- 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/>. */
-
-#if !_LIBC
-# include <config.h>
-#endif
-#include <alloca.h>
-
-/* Specification. */
-#include <stdlib.h>
-
-#include <errno.h>
-#ifndef __set_errno
-# define __set_errno(ev) ((errno) = (ev))
-#endif
-
-#include <string.h>
-#if _LIBC || HAVE_UNISTD_H
-# include <unistd.h>
-#endif
-
-#if _LIBC || !HAVE_SETENV
-
-#if !_LIBC
-# include "malloca.h"
-#endif
-
-#if !_LIBC
-# define __environ environ
-#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
-# define LOCK
-# define UNLOCK
-#endif
-
-/* In the GNU C library we must keep the namespace clean. */
-#ifdef _LIBC
-# define setenv __setenv
-# define clearenv __clearenv
-# define tfind __tfind
-# define tsearch __tsearch
-#endif
-
-/* In the GNU C library implementation we try to be more clever and
- allow arbitrarily many changes of the environment given that the used
- 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
-# include <search.h>
-typedef int (*compar_fn_t) (const void *, const void *);
-
-/* This is a pointer to the root of the search tree with the known
- values. */
-static void *known_values;
-
-# define KNOWN_VALUE(Str) \
- ({ \
- 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)
-
-#else
-# undef USE_TSEARCH
-
-# define KNOWN_VALUE(Str) NULL
-# define STORE_VALUE(Str) do { } while (0)
-
-#endif
-
-
-/* If this variable is not a null pointer we allocated the current
- environment. */
-static char **last_environ;
-
-
-/* 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'
- 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
- free the strings. */
-int
-__add_to_environ (const char *name, const char *value, const char *combined,
- int replace)
-{
- register char **ep;
- register size_t size;
- const size_t namelen = strlen (name);
- const size_t vallen = value != NULL ? strlen (value) + 1 : 0;
-
- LOCK;
-
- /* We have to get the pointer now that we have the lock and not earlier
- since another thread might have created a new environment. */
- ep = __environ;
-
- size = 0;
- if (ep != NULL)
- {
- for (; *ep != NULL; ++ep)
- if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
- break;
- else
- ++size;
- }
-
- if (ep == NULL || *ep == NULL)
- {
- char **new_environ;
-#ifdef USE_TSEARCH
- char *new_value;
-#endif
-
- /* 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 *)));
- if (new_environ == NULL)
- {
- 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;
- else
- {
- /* See whether the value is already known. */
-#ifdef USE_TSEARCH
-# ifdef _LIBC
- new_value = (char *) alloca (namelen + 1 + vallen);
- __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
- value, vallen);
-# else
- 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)
-#endif
- {
- 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;
- }
-
-#ifdef USE_TSEARCH
- 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);
-#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]);
- }
-#if defined USE_TSEARCH && !defined _LIBC
- freea (new_value);
-#endif
- }
-
- if (__environ != last_environ)
- memcpy ((char *) new_environ, (char *) __environ,
- size * sizeof (char *));
-
- new_environ[size + 1] = NULL;
-
- last_environ = __environ = new_environ;
- }
- else if (replace)
- {
- char *np;
-
- /* Use the user string if given. */
- if (combined != NULL)
- np = (char *) combined;
- else
- {
-#ifdef USE_TSEARCH
- char *new_value;
-# ifdef _LIBC
- new_value = alloca (namelen + 1 + vallen);
- __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
- value, vallen);
-# else
- 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)
-#endif
- {
- np = malloc (namelen + 1 + vallen);
- if (np == NULL)
- {
-#if defined USE_TSEARCH && !defined _LIBC
- freea (new_value);
-#endif
- __set_errno (ENOMEM);
- UNLOCK;
- return -1;
- }
-
-#ifdef USE_TSEARCH
- memcpy (np, new_value, namelen + 1 + vallen);
-#else
- memcpy (np, name, namelen);
- np[namelen] = '=';
- memcpy (&np[namelen + 1], value, vallen);
-#endif
- /* And remember the value. */
- STORE_VALUE (np);
- }
-#if defined USE_TSEARCH && !defined _LIBC
- freea (new_value);
-#endif
- }
-
- *ep = np;
- }
-
- UNLOCK;
-
- return 0;
-}
-
-int
-setenv (const char *name, const char *value, int replace)
-{
- return __add_to_environ (name, value, NULL, replace);
-}
-
-/* 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 (void)
-{
- LOCK;
-
- if (__environ == last_environ && __environ != NULL)
- {
- /* We allocated this environment so we can free it. */
- free (__environ);
- last_environ = NULL;
- }
-
- /* Clear the environment pointer removes the whole environment. */
- __environ = NULL;
-
- UNLOCK;
-
- return 0;
-}
-
-#ifdef _LIBC
-static void
-free_mem (void)
-{
- /* Remove all traces. */
- clearenv ();
-
- /* Now remove the search tree. */
- __tdestroy (known_values, free);
- known_values = NULL;
-}
-text_set_element (__libc_subfreeres, free_mem);
-
-
-# undef setenv
-# undef clearenv
-weak_alias (__setenv, setenv)
-weak_alias (__clearenv, clearenv)
-#endif
-
-#endif /* _LIBC || !HAVE_SETENV */
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