kolibrios/programs/develop/open watcom/trunk/clib/environ/clearenv.c
Sergey Semyonov (Serge) 3be3768ce0 update CLib
git-svn-id: svn://kolibrios.org@614 a494cfbc-eb01-0410-851d-a64ba20cac60
2007-08-28 10:31:46 +00:00

70 lines
2.5 KiB
C

/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: Implementation of clearenv() - clear the environment.
*
****************************************************************************/
#include "variety.h"
#include <stdlib.h>
#include <env.h>
#include "liballoc.h"
#include "rtdata.h"
/* Note - clearenv() is always called at library exit */
_WCRTLINK int (clearenv)( void )
{
#ifndef __NETWARE__
char **envp;
char *env_str;
int index;
if( _RWD_environ != NULL ) {
for( envp = _RWD_environ; env_str = *envp; ++envp ) {
if( _RWD_env_mask != NULL ) {
index = envp - _RWD_environ;
if( _RWD_env_mask[ index ] != 0 ) {
lib_free( (void *)env_str );
}
*envp = NULL;
}
}
if( _RWD_env_mask != NULL ) {
lib_free( _RWD_environ );
}
envp = lib_malloc( sizeof(char *) + sizeof(char) );
if( envp == NULL ) return( -1 );
_RWD_environ = envp;
*_RWD_environ = NULL;
_RWD_env_mask = ((char *)envp) + sizeof(char *);
*_RWD_env_mask = 0;
}
#endif
return( 0 ); /* success */
}