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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:  Platform independent setvbuf() implementation.
  28. *
  29. ****************************************************************************/
  30.  
  31.  
  32. #include "variety.h"
  33. #include <stdio.h>
  34. #include <stddef.h>
  35. #include <limits.h>
  36. #include "fileacc.h"
  37. #include "rtdata.h"
  38. #include "streamio.h"
  39.  
  40.  
  41. extern  void    __full_io_exit();
  42.  
  43.  
  44. _WCRTLINK int setvbuf( FILE *fp, char *buf, int mode, size_t size )
  45. {
  46.     __stream_check( fp, 1 );
  47.     __null_check( buf, 2 );
  48.     if( size > INT_MAX ) {
  49.         /* 16-bit buffer filling code can't handle >32k (-ve size) */
  50.         return( -1 );
  51.     }
  52.     /* check for allowable values for mode */
  53.     switch( mode ) {
  54.     case _IOFBF:
  55.     case _IOLBF:
  56.     case _IONBF:
  57.         break;
  58.     default:
  59.         return( -1 );
  60.     }
  61.     if( buf != NULL && size == 0 ) {                /* JBS 27-aug-90 */
  62.         return( -1 );
  63.     }
  64.     _ValidFile( fp, -1 );
  65.     _AccessFile( fp );
  66.     __chktty( fp );                                 /* JBS 28-aug-90 */
  67.     if( size != 0 ) {
  68.         fp->_bufsize = size;                        /* JBS 27-aug-90 */
  69.     }
  70.     _FP_BASE(fp) = buf;
  71.     fp->_ptr  = buf;
  72.     fp->_flag &= ~(_IONBF | _IOLBF | _IOFBF);       /* FWC 14-jul-87 */
  73.     fp->_flag |= mode;
  74.     if( buf == NULL ) {                             /* FWC 16-mar-93 */
  75.         __ioalloc( fp );
  76.     }
  77.     _ReleaseFile( fp );
  78.     return( 0 );
  79. }
  80.