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/* Copyright (C) 1992 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef HAVE_GNU_LD
#define __environ environ
#endif
int
DEFUN(setenv, (name, value, replace),
CONST char *name AND CONST char *value AND int replace)
{
register char **ep;
register size_t size;
CONST size_t namelen = strlen (name);
CONST size_t vallen = strlen (value);
size = 0;
for (ep = __environ; *ep != NULL; ++ep)
if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
break;
else
++size;
if (*ep == NULL)
{
static char **last_environ = NULL;
char **new_environ = (char **) malloc((size + 2) * sizeof(char *));
if (new_environ == NULL)
return -1;
(void) memcpy((PTR) new_environ, (PTR) __environ, size * sizeof(char *));
new_environ[size] = malloc (namelen + 1 + vallen + 1);
if (new_environ[size] == NULL)
{
free (new_environ);
errno = ENOMEM;
return -1;
}
memcpy (new_environ[size], name, namelen);
new_environ[size][namelen] = '=';
memcpy (&new_environ[size][namelen + 1], value, vallen + 1);
new_environ[size + 1] = NULL;
if (last_environ != NULL)
free ((PTR) last_environ);
last_environ = new_environ;
__environ = new_environ;
}
else if (replace)
{
size_t len = strlen (*ep);
if (len < namelen + 1 + vallen)
{
char *new = malloc (namelen + 1 + vallen);
if (new == NULL)
return -1;
*ep = new;
}
memcpy (*ep, name, namelen);
(*ep)[namelen] = '=';
memcpy (&(*ep)[namelen + 1], value, vallen + 1);
}
return 0;
}
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