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/* Copyright (C) 1992,1995-1999,2000-2003,2005,2006 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 2, 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <config.h>
/* AIX is so broken that requires this to be the first thing in the file. */
#if defined(_AIX)
#pragma alloca
#else
# if !defined(alloca) /* predefined by HP cc +Olibcalls */
# ifdef __GNUC__
# define alloca(size) __builtin_alloca(size)
# else
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# if defined(__hpux)
void *alloca ();
# else
# if !defined(__OS2__) && !defined(WIN32)
char *alloca ();
# else
# include <malloc.h> /* OS/2 defines alloca in here */
# endif
# endif
# endif
# endif
# endif
#endif
#include <errno.h>
#ifndef __set_errno
# define __set_errno(ev) ((errno) = (ev))
#endif
#include <stdlib.h>
#include <string.h>
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifndef HAVE_ENVIRON_DECL
extern char **environ;
#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
setenv (const char *name, const char *value, 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;
/* 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;
/* 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)
return -1;
new_environ[size] = (char *) malloc (namelen + 1 + vallen);
if (new_environ[size] == NULL)
{
__set_errno (ENOMEM);
return -1;
}
memcpy (new_environ[size], name, namelen);
new_environ[size][namelen] = '=';
memcpy (&new_environ[size][namelen + 1], value, vallen);
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;
np = malloc (namelen + 1 + vallen);
if (np == NULL)
{
__set_errno (ENOMEM);
return -1;
}
memcpy (np, name, namelen);
np[namelen] = '=';
memcpy (&np[namelen + 1], value, vallen);
*ep = np;
}
return 0;
}
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