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#include <corecrt_internal_mbstring.h>#include <locale.h>#include <string.h>
#pragma warning(disable:__WARNING_INCORRECT_VALIDATION __WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26014 26018
/**** _mbsncpy - Copy one string to another, n chars only (MBCS)**Purpose:* Copies exactly cnt character from src to dst. If strlen(src) < cnt, the* remaining character are padded with null bytes. If strlen >= cnt, no* terminating null byte is added. 2-byte MBCS characters are handled* correctly.**Entry:* unsigned char *dst = destination for copy* unsigned char *src = source for copy* int cnt = number of characters to copy**Exit:* returns dst = destination of copy**Exceptions:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
#pragma warning(suppress:6101) // Returning uninitialized memory '*dst'. A successful path through the function does not set the named _Out_ parameter.extern "C" unsigned char * __cdecl _mbsncpy_l( unsigned char *dst, const unsigned char *src, size_t cnt, _locale_t plocinfo ){ unsigned char *start = dst; _LocaleUpdate _loc_update(plocinfo);
/* validation section */ _VALIDATE_RETURN(dst != nullptr || cnt == 0, EINVAL, nullptr); _VALIDATE_RETURN(src != nullptr || cnt == 0, EINVAL, nullptr);
_BEGIN_SECURE_CRT_DEPRECATION_DISABLE if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)#pragma warning(suppress:__WARNING_BANNED_API_USAGE) return (unsigned char *)strncpy((char *)dst, (const char *)src, cnt); _END_SECURE_CRT_DEPRECATION_DISABLE
while (cnt) {
cnt--; if ( _ismbblead_l(*src, _loc_update.GetLocaleT()) ) { *dst++ = *src++; if ((*dst++ = *src++) == '\0') { dst[-2] = '\0'; break; } } else if ((*dst++ = *src++) == '\0') break;
}
/* pad with nulls as needed */
while (cnt--) *dst++ = '\0';
#pragma warning(suppress:__WARNING_POSTCONDITION_NULLTERMINATION_VIOLATION) // 26036 REVIEW annotation mistake? return start;}extern "C" unsigned char * (__cdecl _mbsncpy)( unsigned char *dst, const unsigned char *src, size_t cnt ){ _BEGIN_SECURE_CRT_DEPRECATION_DISABLE return _mbsncpy_l(dst, src, cnt, nullptr); _END_SECURE_CRT_DEPRECATION_DISABLE}