/*** *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 #include /*** * _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); }