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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:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
  28. *               DESCRIBE IT HERE!
  29. *
  30. ****************************************************************************/
  31.  
  32.  
  33. #include "variety.h"
  34. #include <mbstring.h>
  35. #include "farfunc.h"
  36.  
  37.  
  38.  
  39. /****
  40. ***** Convert a multibyte character to a wide character.
  41. ****/
  42.  
  43. _WCRTLINK int _NEARFAR(mbtowc,_fmbtowc)( wchar_t _FFAR *pwc, const char _FFAR *ch, size_t n )
  44. {
  45.  
  46.     /*** Catch special cases ***/
  47.     if( ch == NULL )  return( 0 );
  48.     if( n == 0 )  return( -1 );
  49.     if( *ch == '\0' ) {
  50.         if( pwc != NULL )  *pwc = L'\0';
  51.         return( 0 );
  52.     }
  53.     if( _ismbblead( ch[0] )  &&  ch[1] == '\0' )  return( -1 ); /* invalid */
  54.  
  55.     /*** Convert the character ***/
  56.         if( _ismbblead(*ch) && n>=2 ) {         /* lead byte present? */
  57.             if( pwc != NULL ) {
  58.                 *pwc = (((wchar_t)ch[0])<<8) |  /* convert to lead:trail */
  59.                         (wchar_t)ch[1];
  60.             }
  61.             return( 2 );                        /* return char size */
  62.         } else if( !_ismbblead(*ch) ) {
  63.             if( pwc != NULL ) {
  64.                 *pwc = (wchar_t)ch[0];          /* convert to 00:byte */
  65.             }
  66.             return( 1 );                        /* return char size */
  67.         } else {
  68.             return( -1 );                       /* n==1, but char 2 bytes */
  69.         }
  70. }
  71.