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/* $Id: unsetenv.c,v 1.4 2005/11/18 09:43:19 davidlee Exp $ */
/*
* Copyright (C) 2001 Alan Robertson <alanr@unix.sh>
* This software licensed under the GNU LGPL.
*
*
* This 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.
*
* This 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 have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <portability.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define __environ environ
#ifndef HAVE_ENVIRON_DECL
extern char **environ;
#endif
void
unsetenv (const char *name)
{
const size_t len = strlen (name);
char **ep;
for (ep = __environ; *ep; ++ep) {
if (!strncmp (*ep, name, len) && (*ep)[len] == '=') {
/* Found it. */
/* Remove this pointer by moving later ones back. */
char **dp = ep;
do
dp[0] = dp[1];
while (*dp++);
/* Continue the loop in case NAME appears again. */
}
}
}
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