/**************************************************************************** * * 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 */ } }