ismbbyte.c

C标准库源代码

/***
*ismbbyte.c - Function versions of MBCS ctype macros
*
*       Copyright (c) 1988-1997, Microsoft Corporation.  All rights reserved.
*
*Purpose:
*       This files provides function versions of the character
*       classification a*d conversion macros in mbctype.h.
*
*******************************************************************************/

#ifdef _MBCS

#include <cruntime.h>
#include <ctype.h>
#include <mbdata.h>
#include <mbctype.h>
#include <mbstring.h>

/* defined in mbctype.h
; Define masks

; set bit masks for the possible kanji character types
; (all MBCS bit masks start with "_M")

_MS             equ     01h     ; MBCS non-ascii single byte char
_MP             equ     02h     ; MBCS punct
_M1             equ     04h     ; MBCS 1st (lead) byte
_M2             equ     08h     ; MBCS 2nd byte

*/

/* defined in ctype.h
; set bit masks for the possible character types

_UPPER          equ     01h     ; upper case letter
_LOWER          equ     02h     ; lower case letter
_DIGIT          equ     04h     ; digit[0-9]
_SPACE          equ     08h     ; tab, carriage return, newline,
                                ; vertical tab or form feed
_PUNCT          equ     10h     ; punctuation character
_CONTROL        equ     20h     ; control character
_BLANK          equ     40h     ; space char
_HEX            equ     80h     ; hexadecimal digit

*/

/* defined in ctype.h, mbdata.h
        extrn   __mbctype:byte          ; MBCS ctype table
        extrn   __ctype_:byte           ; ANSI/ASCII ctype table
*/


/***
* ismbbyte - Function versions of mbctype macros
*
*Purpose:
*
*Entry:
*       int = character to be tested
*Exit:
*       ax = non-zero = character is of the requested type
*          =        0 = character is NOT of the requested type
*
*Uses:
*
*Exceptions:
*
*******************************************************************************/

int __cdecl x_ismbbtype(unsigned int, int, int);


/* ismbbk functions */

int (__cdecl _ismbbkalnum) (unsigned int tst)
{
        return x_ismbbtype(tst,0,_MS);
}

int (__cdecl _ismbbkprint) (unsigned int tst)
{
        return x_ismbbtype(tst,0,(_MS | _MP));
}

int (__cdecl _ismbbkpunct) (unsigned int tst)
{
        return x_ismbbtype(tst,0,_MP);
}


/* ismbb functions */

int (__cdecl _ismbbalnum) (unsigned int tst)
{
        return x_ismbbtype(tst,(_ALPHA | _DIGIT), _MS);
}

int (__cdecl _ismbbalpha) (unsigned int tst)
{
        return x_ismbbtype(tst,_ALPHA, _MS);
}

int (__cdecl _ismbbgraph) (unsigned int tst)
{
        return x_ismbbtype(tst,(_PUNCT | _ALPHA | _DIGIT),(_MS | _MP));
}

int (__cdecl _ismbbprint) (unsigned int tst)
{
        return x_ismbbtype(tst,(_BLANK | _PUNCT | _ALPHA | _DIGIT),(_MS | _MP));
}

int (__cdecl _ismbbpunct) (unsigned int tst)
{
        return x_ismbbtype(tst,_PUNCT, _MP);
}


/* lead and trail */

int (__cdecl _ismbblead) (unsigned int tst)
{
        return x_ismbbtype(tst,0,_M1);
}

int (__cdecl _ismbbtrail) (unsigned int tst)
{
        return x_ismbbtype(tst,0,_M2);
}


/* 932 specific */

int (__cdecl _ismbbkana) (unsigned int tst)
{
        return (__mbcodepage == _KANJI_CP && x_ismbbtype(tst,0,(_MS | _MP)));
}

/***
* Common code
*
*      cmask = mask for _ctype[] table
*      kmask = mask for _mbctype[] table
*
*******************************************************************************/

static int __cdecl x_ismbbtype (unsigned int tst, int cmask, int kmask)
{
        tst = (unsigned int)(unsigned char)tst;         /* get input character
                                                   and make sure < 256 */

        return  ((*(_mbctype+1+tst)) & kmask) ||
                ((cmask) ? ((*(_ctype+1+tst)) & cmask) : 0);
}

#endif  /* _MBCS */