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