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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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mbsbtype.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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77 lines
/***
*mbsbtype.c - Return type of byte within a string (MBCS)
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Return type of byte within a string (MBCS)
*
*******************************************************************************/
#ifdef _MBCS
#include <mtdll.h>
#include <cruntime.h>
#include <mbdata.h>
#include <mbstring.h>
#include <mbctype.h>
#define _MBBTYPE(p,c) _mbbtype(p,c)
/***
* _mbsbtype - Return type of byte within a string
*
*Purpose:
* Test byte within a string for MBCS char type.
* This function requires the start of the string because
* context must be taken into account.
*
*Entry:
* const unsigned char *string = pointer to string
* size_t len = position of the char in string
*
*Exit:
* returns one of the following values:
*
* _MBC_LEAD = if 1st byte of MBCS char
* _MBC_TRAIL = if 2nd byte of MBCS char
* _MBC_SINGLE = valid single byte char
*
* _MBC_ILLEGAL = if illegal char
*
*Exceptions:
* returns _MBC_ILLEGAL if len is bigger than string length
*
*******************************************************************************/
int __cdecl _mbsbtype(
const unsigned char *string,
size_t len
)
{
int chartype;
if ( _ISNOTMBCP )
return _MBC_SINGLE;
_mlock(_MB_CP_LOCK);
chartype = _MBC_ILLEGAL;
do {
if (*string == '\0')
{
_munlock(_MB_CP_LOCK);
return(_MBC_ILLEGAL);
}
chartype = _MBBTYPE(*string++, chartype);
} while (len--);
_munlock(_MB_CP_LOCK);
return(chartype);
}
#endif /* _MBCS */