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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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ismbbyte.c
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C/C++ Source or Header
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1998-06-17
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4KB
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158 lines
/***
*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 */