mbisalnu.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 64 行

/****************************************************************************
*
*                            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
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*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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*    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
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


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

/**
 * Determine if a multibyte character is alphanumeric.
 */

_WCRTLINK int _ismbcalnum( 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_DIGIT | C1_ALPHA)) == 0 ) return( 0 );
    return( 1 );
#else                                   /* OS/2 and others */
    return( _ismbcalpha( ch )  ||  _ismbcdigit( ch ) );
#endif
}