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/* Copyright (C) 1992, 1995-2003, 2005-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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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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#if !_LIBC
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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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# define _GL_USE_STDLIB_ALLOC 1
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# include <config.h>
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#endif
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#include <alloca.h>
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/* Specification. */
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#include <stdlib.h>
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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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#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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#if !_LIBC
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# include "malloca.h"
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#endif
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#if _LIBC || !HAVE_SETENV
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#if !_LIBC
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# define __environ environ
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#endif
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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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/* 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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#endif
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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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/* 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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# 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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#else
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# undef USE_TSEARCH
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# define KNOWN_VALUE(Str) NULL
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# define STORE_VALUE(Str) do { } while (0)
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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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environment. */
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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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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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LOCK;
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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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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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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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/* 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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/* 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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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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#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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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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new_environ[size + 1] = NULL;
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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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/* 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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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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#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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*ep = np;
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}
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UNLOCK;
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return 0;
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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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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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|
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never made it. Nevertheless the POSIX.9 standard (POSIX bindings
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|
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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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|
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LOCK;
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|
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|
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if (__environ == last_environ && __environ != NULL)
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|
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{
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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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|
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/* Clear the environment pointer removes the whole environment. */
|
|
Packit |
709fb3 |
__environ = NULL;
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
UNLOCK;
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
return 0;
|
|
Packit |
709fb3 |
}
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
#ifdef _LIBC
|
|
Packit |
709fb3 |
static void
|
|
Packit |
709fb3 |
free_mem (void)
|
|
Packit |
709fb3 |
{
|
|
Packit |
709fb3 |
/* Remove all traces. */
|
|
Packit |
709fb3 |
clearenv ();
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
/* Now remove the search tree. */
|
|
Packit |
709fb3 |
__tdestroy (known_values, free);
|
|
Packit |
709fb3 |
known_values = NULL;
|
|
Packit |
709fb3 |
}
|
|
Packit |
709fb3 |
text_set_element (__libc_subfreeres, free_mem);
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
# undef setenv
|
|
Packit |
709fb3 |
# undef clearenv
|
|
Packit |
709fb3 |
weak_alias (__setenv, setenv)
|
|
Packit |
709fb3 |
weak_alias (__clearenv, clearenv)
|
|
Packit |
709fb3 |
#endif
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
#endif /* _LIBC || !HAVE_SETENV */
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
/* The rest of this file is called into use when replacing an existing
|
|
Packit |
709fb3 |
but buggy setenv. Known bugs include failure to diagnose invalid
|
|
Packit |
709fb3 |
name, and consuming a leading '=' from value. */
|
|
Packit |
709fb3 |
#if HAVE_SETENV
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
# undef setenv
|
|
Packit |
709fb3 |
# if !HAVE_DECL_SETENV
|
|
Packit |
709fb3 |
extern int setenv (const char *, const char *, int);
|
|
Packit |
709fb3 |
# endif
|
|
Packit |
709fb3 |
# define STREQ(a, b) (strcmp (a, b) == 0)
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
int
|
|
Packit |
709fb3 |
rpl_setenv (const char *name, const char *value, int replace)
|
|
Packit |
709fb3 |
{
|
|
Packit |
709fb3 |
int result;
|
|
Packit |
709fb3 |
if (!name || !*name || strchr (name, '='))
|
|
Packit |
709fb3 |
{
|
|
Packit |
709fb3 |
errno = EINVAL;
|
|
Packit |
709fb3 |
return -1;
|
|
Packit |
709fb3 |
}
|
|
Packit |
709fb3 |
/* Call the real setenv even if replace is 0, in case implementation
|
|
Packit |
709fb3 |
has underlying data to update, such as when environ changes. */
|
|
Packit |
709fb3 |
result = setenv (name, value, replace);
|
|
Packit |
709fb3 |
if (result == 0 && replace && *value == '=')
|
|
Packit |
709fb3 |
{
|
|
Packit |
709fb3 |
char *tmp = getenv (name);
|
|
Packit |
709fb3 |
if (!STREQ (tmp, value))
|
|
Packit |
709fb3 |
{
|
|
Packit |
709fb3 |
int saved_errno;
|
|
Packit |
709fb3 |
size_t len = strlen (value);
|
|
Packit |
709fb3 |
tmp = malloca (len + 2);
|
|
Packit |
709fb3 |
/* Since leading '=' is eaten, double it up. */
|
|
Packit |
709fb3 |
*tmp = '=';
|
|
Packit |
709fb3 |
memcpy (tmp + 1, value, len + 1);
|
|
Packit |
709fb3 |
result = setenv (name, tmp, replace);
|
|
Packit |
709fb3 |
saved_errno = errno;
|
|
Packit |
709fb3 |
freea (tmp);
|
|
Packit |
709fb3 |
errno = saved_errno;
|
|
Packit |
709fb3 |
}
|
|
Packit |
709fb3 |
}
|
|
Packit |
709fb3 |
return result;
|
|
Packit |
709fb3 |
}
|
|
Packit |
709fb3 |
|
|
Packit |
709fb3 |
#endif /* HAVE_SETENV */
|