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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172/****mbsnbcnt.c - Returns byte count of MBCS string** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Returns byte 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>
/**** _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:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" size_t __cdecl _mbsnbcnt_l( const unsigned char *string, size_t ccnt, _locale_t plocinfo ){ unsigned char *p; _LocaleUpdate _loc_update(plocinfo);
/* validation section */ _VALIDATE_RETURN(string != nullptr || ccnt == 0, EINVAL, 0);
for (p = (unsigned char *)string; (ccnt-- && *p); p++) { if ( _ismbblead_l(*p, _loc_update.GetLocaleT()) ) { if (*++p == '\0') { --p; break; } } }
return ((size_t) ((char *)p - (char *)string));}
extern "C" size_t (__cdecl _mbsnbcnt)( const unsigned char *string, size_t ccnt ){ return _mbsnbcnt_l(string, ccnt, nullptr);}