mbisxdig.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 75 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
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*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#include "variety.h"
#ifdef __NT__
    #include <windows.h>
    #include <winnls.h>
#else
    #include <ctype.h>
#endif
#include <mbctype.h>
#include <mbstring.h>
#include "mbchar.h"

/**
 * Determine if a multibyte character is a hexadecimal digit.
 */

_WCRTLINK int _ismbcxdigit( unsigned int ch )
{
#ifdef __NT__
    BOOL                rc;
    int                 len;
    char                mbc[ MB_LEN_MAX + 1 ];
    WORD                char_type[ MB_LEN_MAX + 1 ];

    _mbvtop( ch, mbc );
    len = _mbclen( mbc );
    mbc[ len ] = '\0';
    rc = GetStringTypeEx( LOCALE_USER_DEFAULT, CT_CTYPE1, mbc, -1, char_type );
    if( rc == FALSE ) return( 0 );
    if( (char_type[ 0 ] & C1_XDIGIT) == 0 ) return( 0 );
    return( 1 );
#else                                   /* OS/2 and others */
    if( SINGLE_BYTE_CHAR( ch ) ) {
        return( isxdigit( ch ) );
    } else {
        if( __MBCodePage == 932 ) {
            return( _ismbdxdigit( ch ) );
        } else {
            return( 0 );
        }
    }
#endif
}