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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768/****mbsnccnt.c - Return char count of MBCS string** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Return char count of MBCS string********************************************************************************/#ifndef _MBCS #error This file should only be compiled with _MBCS defined#endif
#include <corecrt_internal_mbstring.h>#include <locale.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:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" size_t __cdecl _mbsnccnt_l( const unsigned char *string, size_t bcnt, _locale_t plocinfo ){ size_t n; _LocaleUpdate _loc_update(plocinfo);
_VALIDATE_RETURN(string != nullptr || bcnt == 0, EINVAL, 0);
for (n = 0; (bcnt-- && *string); n++, string++) { if ( _ismbblead_l(*string, _loc_update.GetLocaleT()) ) { if ( (!bcnt--) || (*++string == '\0')) break; } }
return(n);}extern "C" size_t (__cdecl _mbsnccnt)( const unsigned char *string, size_t bcnt ){ return _mbsnccnt_l(string, bcnt, nullptr);}