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  1. /****************************************************************************
  2. *
  3. *                            Open Watcom Project
  4. *
  5. *    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
  6. *
  7. *  ========================================================================
  8. *
  9. *    This file contains Original Code and/or Modifications of Original
  10. *    Code as defined in and that are subject to the Sybase Open Watcom
  11. *    Public License version 1.0 (the 'License'). You may not use this file
  12. *    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
  13. *    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
  14. *    provided with the Original Code and Modifications, and is also
  15. *    available at www.sybase.com/developer/opensource.
  16. *
  17. *    The Original Code and all software distributed under the License are
  18. *    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  19. *    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
  20. *    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
  21. *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
  22. *    NON-INFRINGEMENT. Please see the License for the specific language
  23. *    governing rights and limitations under the License.
  24. *
  25. *  ========================================================================
  26. *
  27. * Description:  Implementation of clearenv() - clear the environment.
  28. *
  29. ****************************************************************************/
  30.  
  31.  
  32. #include "variety.h"
  33. #include <stdlib.h>
  34. #include <env.h>
  35. #include "liballoc.h"
  36. #include "rtdata.h"
  37.  
  38. /* Note - clearenv() is always called at library exit */
  39.  
  40. _WCRTLINK int (clearenv)( void )
  41. {
  42. #ifndef __NETWARE__
  43.     char    **envp;
  44.     char    *env_str;
  45.     int     index;
  46.  
  47.     if( _RWD_environ != NULL ) {
  48.         for( envp = _RWD_environ; env_str = *envp; ++envp ) {
  49.             if( _RWD_env_mask != NULL ) {
  50.                 index = envp - _RWD_environ;
  51.                 if( _RWD_env_mask[ index ] != 0 ) {
  52.                     lib_free( (void *)env_str );
  53.                 }
  54.                 *envp = NULL;
  55.             }
  56.         }
  57.         if( _RWD_env_mask != NULL ) {
  58.             lib_free( _RWD_environ );
  59.         }
  60.         envp = lib_malloc( sizeof(char *) + sizeof(char) );
  61.         if( envp == NULL ) return( -1 );
  62.         _RWD_environ = envp;
  63.         *_RWD_environ = NULL;
  64.         _RWD_env_mask = ((char *)envp) + sizeof(char *);
  65.         *_RWD_env_mask = 0;
  66.     }
  67. #endif
  68.     return( 0 );                /* success */
  69. }
  70.