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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293/****mbsncmp.c - Compare n characters of two MBCS strings** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Compare 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 <locale.h>#include <string.h>
#pragma warning(disable:__WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26018
/****int mbsncmp(s1, s2, n) - Compare n characters of two MBCS strings**Purpose:* Compares up to n characters of two strings for ordinal order.* Strings are compared on a character basis, not a byte basis.** UTF-8 and SBCS are merely compared in byte order.* DBCS are compared by codepoint to ensure double byte chars sort last**Entry:* unsigned char *s1, *s2 = strings to compare* size_t n = maximum number of characters to compare**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 _mbsncmp_l( const unsigned char *s1, const unsigned char *s2, size_t n, _locale_t plocinfo ){ unsigned short c1, c2; _LocaleUpdate _loc_update(plocinfo);
if (n==0) return(0);
if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0) return strncmp((const char *)s1, (const char *)s2, n);
/* validation section */ _VALIDATE_RETURN(s1 != nullptr, EINVAL, _NLSCMPERROR); _VALIDATE_RETURN(s2 != nullptr, EINVAL, _NLSCMPERROR);
while (n--) {
c1 = *s1++; if ( _ismbblead_l(c1, _loc_update.GetLocaleT()) ) c1 = ( (*s1 == '\0') ? 0 : ((c1<<8) | *s1++) );
c2 = *s2++; if ( _ismbblead_l(c2, _loc_update.GetLocaleT()) ) c2 = ( (*s2 == '\0') ? 0 : ((c2<<8) | *s2++) );
if (c1 != c2) return( (c1 > c2) ? 1 : -1);
if (c1 == 0) return(0); }
return(0);}
extern "C" int (__cdecl _mbsncmp)( const unsigned char *s1, const unsigned char *s2, size_t n ){ return _mbsncmp_l(s1, s2, n, nullptr);}