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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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ismbgrph.c
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C/C++ Source or Header
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1998-06-17
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2KB
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91 lines
/***
*ismbgrph - Test if character is graphical (MBCS)
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Test if character is graphical (MBCS)
*
*******************************************************************************/
#ifdef _MBCS
#if defined (_WIN32)
#include <windows.h>
#include <awint.h>
#endif /* defined (_WIN32) */
#include <cruntime.h>
#include <ctype.h>
#include <mbdata.h>
#include <mbctype.h>
#include <mbstring.h>
/***
* _ismbcgraph - Test if character is graphical (MBCS)
*
*Purpose:
* Test if the supplied character is graphical or not.
* Handles MBCS characters correctly.
*
* Note: Use test against 0x00FF instead of _ISLEADBYTE
* to ensure that we don't call SBCS routine with a two-byte
* value.
*
*Entry:
* unsigned int c = character to test
*
*Exit:
* Returns TRUE if c is an graphical character; else FALSE
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _ismbcgraph(
unsigned int c
)
{
if (c > 0x00FF)
{
#if defined (_WIN32)
char buf[2];
unsigned short ctype[2] = {0};
buf[0] = (c >> 8) & 0xFF;
buf[1] = c & 0xFF;
/* return FALSE if not in supported MB code page */
if ( _ISNOTMBCP )
return 0;
/*
* Since 'c' could be two one-byte MB chars, we need room in the
* ctype return array to handle this. In this case, the
* second word in the return array will be non-zero.
*/
if (__crtGetStringTypeA (CT_CTYPE1, buf,
2, ctype, __mbcodepage, __mblcid, TRUE) == 0)
return 0;
/* ensure single MB character and test for type */
return (ctype[1] == 0 && ctype[0] & (_PUNCT|_ALPHA|_DIGIT));
#else /* defined (_WIN32) */
/* no hard-coded double-byte graphical info available */
return _ismbcalnum(c) | _ismbcdigit(c);
#endif /* defined (_WIN32) */
} else
return _ismbbgraph(c);
}
#endif /* _MBCS */