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/******************************** -*- C -*- ****************************
*
* putenv substitute
*
*
***********************************************************************/
/***********************************************************************
*
* Copyright 1988,89,90,91,92,94,95,99,2000
* Free Software Foundation, Inc.
*
* This file is part of the GNU C Library.
*
* The GNU C Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* The GNU C Library 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
* Lesser General Public License for more details.
*
* You should receive a copy of the GNU Lesser General Public License
* along with the GNU C Library; see the file COPYING.LESSER. If not, write
* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "alloc.h"
#include <errno.h>
#if STDC_HEADERS
#include <stdlib.h>
#include <string.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef HAVE_PUTENV
extern char **environ;
#define __environ environ
/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
int putenv(const char *string)
{
char *name_end = strchr(string, '=');
register size_t size;
register char **ep;
if (name_end == NULL)
{
/* Remove the variable from the environment. */
size = strlen(string);
for (ep = __environ; *ep != NULL; ++ep)
if (!strncmp(*ep, string, size) && (*ep)[size] == '=')
{
while (ep[1] != NULL)
{
ep[0] = ep[1];
++ep;
}
*ep = NULL;
return 0;
}
}
size = 0;
for (ep = __environ; *ep != NULL; ++ep)
if (!strncmp(*ep, string, name_end - string) &&
(*ep)[name_end - string] == '=')
break;
else
++size;
if (*ep == NULL)
{
static char **last_environ = NULL;
char **new_environ = (char **) xmalloc((size + 2) * sizeof(char *));
if (new_environ == NULL)
return -1;
memcpy(new_environ, __environ, size * sizeof(char *));
ep = &new_environ[size];
new_environ[size + 1] = NULL;
if (last_environ != NULL)
xfree(last_environ);
last_environ = new_environ;
__environ = new_environ;
}
*ep = (char *) strdup(string);
return 0;
}
#endif