91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/***
|
|
*mbsnbcnt.c - Returns byte count of MBCS string
|
|
*
|
|
* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* Returns byte count of MBCS string
|
|
*
|
|
*Revision History:
|
|
* 11-19-92 KRS Ported from 16-bit sources.
|
|
* 10-05-93 GJF Replaced _CRTAPI1 with __cdecl.
|
|
* 04-15-93 CFW Add _MB_CP_LOCK.
|
|
* 05-19-94 CFW Enable non-Win32.
|
|
* 04-15-98 GJF Revised multithread support based on threadmbcinfo
|
|
* structs
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#ifdef _MBCS
|
|
|
|
#include <mtdll.h>
|
|
#include <cruntime.h>
|
|
#include <mbdata.h>
|
|
#include <mbctype.h>
|
|
#include <mbstring.h>
|
|
|
|
|
|
/***
|
|
* _mbsnbcnt - Returns byte count of MBCS string
|
|
*
|
|
*Purpose:
|
|
* Returns the number of bytes between the start of the supplied
|
|
* string and the char count supplied. That is, this routine
|
|
* indicates how many bytes are in the first "ccnt" characters
|
|
* of the string.
|
|
*
|
|
*Entry:
|
|
* unsigned char *string = pointer to string
|
|
* unsigned int ccnt = number of characters to scan
|
|
*
|
|
*Exit:
|
|
* Returns number of bytes between string and ccnt.
|
|
*
|
|
* If the end of the string is encountered before ccnt chars were
|
|
* scanned, then the length of the string in bytes is returned.
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
size_t __cdecl _mbsnbcnt(
|
|
const unsigned char *string,
|
|
size_t ccnt
|
|
)
|
|
{
|
|
#ifdef _MT
|
|
pthreadmbcinfo ptmbci = _getptd()->ptmbcinfo;
|
|
|
|
if ( ptmbci != __ptmbcinfo )
|
|
ptmbci = __updatetmbcinfo();
|
|
|
|
return __mbsnbcnt_mt(ptmbci, string, ccnt);
|
|
}
|
|
|
|
size_t __cdecl __mbsnbcnt_mt(
|
|
pthreadmbcinfo ptmbci,
|
|
const unsigned char *string,
|
|
size_t ccnt
|
|
)
|
|
{
|
|
#endif
|
|
unsigned char *p;
|
|
|
|
for (p = (char *)string; (ccnt-- && *p); p++) {
|
|
#ifdef _MT
|
|
if ( __ismbblead_mt(ptmbci, *p) ) {
|
|
#else
|
|
if ( _ismbblead(*p) ) {
|
|
#endif
|
|
if (*++p == '\0') {
|
|
--p;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return ((size_t) ((char *)p - (char *)string));
|
|
}
|
|
|
|
#endif /* _MBCS */
|