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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677/****ismbslead.c - True _ismbslead function** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Contains the function _ismbslead, which is a true context-sensitive* MBCS lead-byte function. While much less efficient than _ismbblead,* it is also much more sophisticated, in that it determines whether a* given sub-string pointer points to a lead byte or not, taking into* account the context in the string.********************************************************************************/#ifndef _MBCS #error This file should only be compiled with _MBCS defined#endif
#include <corecrt_internal_mbstring.h>#include <locale.h>
/**** int _ismbslead(const unsigned char *string, const unsigned char *current);**Purpose:** _ismbslead - Check, in context, for MBCS lead byte**Entry:* unsigned char *string - ptr to start of string or previous known lead byte* unsigned char *current - ptr to position in string to be tested**Exit:* TRUE : -1* FALSE : 0**Exceptions:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" int __cdecl _ismbslead_l( const unsigned char *string, const unsigned char *current, _locale_t plocinfo ){ /* validation section */ _VALIDATE_RETURN(string != nullptr, EINVAL, 0); _VALIDATE_RETURN(current != nullptr, EINVAL, 0);
_LocaleUpdate _loc_update(plocinfo);
if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0) return 0;
while (string <= current && *string) { if ( _ismbblead_l((*string), _loc_update.GetLocaleT()) ) { if (string++ == current) /* check lead byte */ return -1; if (!(*string)) return 0; } ++string; }
return 0;}
extern "C" int (__cdecl _ismbslead)( const unsigned char *string, const unsigned char *current ){ return _ismbslead_l(string, current, nullptr);}