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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192/****mbsncol.c - Collate n characters of two MBCS strings** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Collate n characters of two MBCS strings********************************************************************************/#ifndef _MBCS #error This file should only be compiled with _MBCS defined#endif
#include <corecrt_internal_mbstring.h>#include <limits.h>#include <locale.h>#include <string.h>
/**** _mbsncoll(s1, s2, n) - Collate n characters of two MBCS strings**Purpose:* Collates up to n charcters of two strings for lexical order.* Strings are collated on a character basis, not a byte basis.**Entry:* unsigned char *s1, *s2 = strings to collate* size_t n = maximum number of characters to collate**Exit:* Returns <0 if s1 < s2* Returns 0 if s1 == s2* Returns >0 if s1 > s2* Returns _NLSCMPERROR is something went wrong**Exceptions:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" int __cdecl _mbsncoll_l( const unsigned char *s1, const unsigned char *s2, size_t n, _locale_t plocinfo ){ int ret; size_t bcnt1, bcnt2; _LocaleUpdate _loc_update(plocinfo);
if (n == 0) return 0;
/* validation section */ _VALIDATE_RETURN(s1 != nullptr, EINVAL, _NLSCMPERROR); _VALIDATE_RETURN(s2 != nullptr, EINVAL, _NLSCMPERROR); _VALIDATE_RETURN(n <= INT_MAX, EINVAL, _NLSCMPERROR);
if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0) return _strncoll_l((const char *)s1, (const char *)s2, n, plocinfo);
bcnt1 = _mbsnbcnt_l(s1, n, _loc_update.GetLocaleT()); bcnt2 = _mbsnbcnt_l(s2, n, _loc_update.GetLocaleT());
if ( 0 == (ret = __acrt_CompareStringA( _loc_update.GetLocaleT(), _loc_update.GetLocaleT()->mbcinfo->mblocalename, SORT_STRINGSORT, (const char *)s1, (int)bcnt1, (char *)s2, (int)bcnt2, _loc_update.GetLocaleT()->mbcinfo->mbcodepage )) ) { errno = EINVAL; return _NLSCMPERROR; }
return ret - 2;
}
extern "C" int (__cdecl _mbsncoll)( const unsigned char *s1, const unsigned char *s2, size_t n ){ return _mbsncoll_l(s1, s2, n, nullptr);}