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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 fscanf_s() - safe formatted stream input.
  28. *
  29. ****************************************************************************/
  30.  
  31.  
  32. #include "variety.h"
  33. #include "saferlib.h"
  34. #include "widechar.h"
  35. #include <stdio.h>
  36. #include <stdarg.h>
  37. #include <wchar.h>
  38. #include "rtdata.h"
  39. #include "scanf.h"
  40. #include "fileacc.h"
  41. #include "orient.h"
  42.  
  43.  
  44. static int cget_file( PTR_SCNF_SPECS specs )
  45. {
  46.     int     c;
  47.  
  48.     if( (c = __F_NAME(getc,getwc)( (FILE *)specs->ptr )) == __F_NAME(EOF,WEOF) ) {
  49.         specs->eoinp = 1;
  50.     }
  51.     return( c );
  52. }
  53.  
  54.  
  55. static void uncget_file( int c, PTR_SCNF_SPECS specs )
  56. {
  57.     __F_NAME(ungetc,ungetwc)( c, (FILE *)specs->ptr );
  58. }
  59.  
  60.  
  61. _WCRTLINK int __F_NAME(fscanf_s,fwscanf_s)( FILE * __restrict stream,
  62.                                  const CHAR_TYPE * __restrict format, ... )
  63. {
  64.     va_list         arg;
  65.     SCNF_SPECS      specs;
  66.     const char      *msg;
  67.     int             rc;
  68.  
  69.     /* Basic check for null pointers to see if we can continue */
  70.     if( __check_constraint_nullptr_msg( msg, stream )
  71.      && __check_constraint_nullptr_msg( msg, format ) ) {
  72.  
  73.         _AccessFile( stream );
  74.  
  75.         /*** Deal with stream orientation ***/
  76.         ORIENT_STREAM(stream,0);
  77.  
  78.         specs.ptr        = (CHAR_TYPE *)stream;
  79.         specs.cget_rtn   = cget_file;
  80.         specs.uncget_rtn = uncget_file;
  81.         msg = NULL;
  82.  
  83.         va_start( arg, format );
  84.         rc = __F_NAME(__scnf_s,__wscnf_s)( (PTR_SCNF_SPECS)&specs, format, &msg, arg );
  85.         va_end( arg );
  86.  
  87.         _ReleaseFile( stream );
  88.  
  89.         if( msg == NULL ) {
  90.             /* no rt-constraint violation inside worker routine */
  91.             return( rc );
  92.         }
  93.     }
  94.     __rtct_fail( __func__, msg, NULL );
  95.     return( __F_NAME(EOF,WEOF) );
  96. }
  97.