?? mbsnccnt.c
字號:
/***
*mbsnccnt.c - Return char count of MBCS string
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Return char count of MBCS string
*
*******************************************************************************/
#ifdef _MBCS
#include <mtdll.h>
#include <cruntime.h>
#include <mbdata.h>
#include <mbctype.h>
#include <mbstring.h>
/***
* _mbsnccnt - Return char count of MBCS string
*
*Purpose:
* Returns the number of chars between the start of the supplied
* string and the byte count supplied. That is, this routine
* indicates how many chars are in the first "bcnt" bytes
* of the string.
*
*Entry:
* const unsigned char *string = pointer to string
* unsigned int bcnt = number of bytes to scan
*
*Exit:
* Returns number of chars between string and bcnt.
*
* If the end of the string is encountered before bcnt chars were
* scanned, then the length of the string in chars is returned.
*
*Exceptions:
*
*******************************************************************************/
size_t __cdecl _mbsnccnt(
const unsigned char *string,
size_t bcnt
)
{
unsigned int n;
_mlock(_MB_CP_LOCK);
for (n = 0; (bcnt-- && *string); n++, string++) {
if (_ISLEADBYTE(*string)) {
if ( (!bcnt--) || (*++string == '\0'))
break;
}
}
_munlock(_MB_CP_LOCK);
return(n);
}
#endif /* _MBCS */
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