71 lines
2.7 KiB
C
71 lines
2.7 KiB
C
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/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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* DESCRIBE IT HERE!
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*
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****************************************************************************/
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#include "variety.h"
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#include <mbstring.h>
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#include "farfunc.h"
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/****
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***** Convert a multibyte character to a wide character.
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****/
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_WCRTLINK int _NEARFAR(mbtowc,_fmbtowc)( wchar_t _FFAR *pwc, const char _FFAR *ch, size_t n )
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{
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/*** Catch special cases ***/
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if( ch == NULL ) return( 0 );
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if( n == 0 ) return( -1 );
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if( *ch == '\0' ) {
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if( pwc != NULL ) *pwc = L'\0';
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return( 0 );
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}
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if( _ismbblead( ch[0] ) && ch[1] == '\0' ) return( -1 ); /* invalid */
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/*** Convert the character ***/
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if( _ismbblead(*ch) && n>=2 ) { /* lead byte present? */
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if( pwc != NULL ) {
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*pwc = (((wchar_t)ch[0])<<8) | /* convert to lead:trail */
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(wchar_t)ch[1];
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}
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return( 2 ); /* return char size */
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} else if( !_ismbblead(*ch) ) {
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if( pwc != NULL ) {
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*pwc = (wchar_t)ch[0]; /* convert to 00:byte */
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}
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return( 1 ); /* return char size */
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} else {
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return( -1 ); /* n==1, but char 2 bytes */
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}
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}
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