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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134/****mbsnbicmp.c - Compare n bytes of strings, ignoring case (MBCS)** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Compare n bytes of strings, ignoring case (MBCS)********************************************************************************/#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
/**** _mbsnbicmp - Compare n bytes of strings, ignoring case (MBCS)**Purpose:* Compares up to n bytes of two strings for ordinal order.* Strings are compared on a character basis, not a byte basis.* Case of characters is not considered.**Entry:* unsigned char *s1, *s2 = strings to compare* size_t n = maximum number of bytes 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.********************************************************************************/
int __cdecl _mbsnbicmp_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 _strnicmp((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()) ) { if (n==0) { c1 = 0; /* 'naked' lead - end of string */ c2 = _ismbblead_l(*s2, _loc_update.GetLocaleT()) ? 0 : *s2; goto test; } if (*s1 == '\0') c1 = 0; else { c1 = ((c1<<8) | *s1++);
if ( ((c1 >= _MBUPPERLOW1_MT(_loc_update.GetLocaleT())) && (c1 <= _MBUPPERHIGH1_MT(_loc_update.GetLocaleT()))) ) c1 += _MBCASEDIFF1_MT(_loc_update.GetLocaleT()); else if ( ((c1 >= _MBUPPERLOW2_MT(_loc_update.GetLocaleT())) && (c1 <= _MBUPPERHIGH2_MT(_loc_update.GetLocaleT()))) ) c1 += _MBCASEDIFF2_MT(_loc_update.GetLocaleT()); } } else c1 = _mbbtolower_l(c1, _loc_update.GetLocaleT());
c2 = *s2++; if ( _ismbblead_l(c2, _loc_update.GetLocaleT()) ) { if (n==0) { c2 = 0; /* 'naked' lead - end of string */ goto test; } n--; if (*s2 == '\0') c2 = 0; else { c2 = ((c2<<8) | *s2++);
if ( ((c2 >= _MBUPPERLOW1_MT(_loc_update.GetLocaleT())) && (c2 <= _MBUPPERHIGH1_MT(_loc_update.GetLocaleT()))) ) c2 += _MBCASEDIFF1_MT(_loc_update.GetLocaleT()); else if ( ((c2 >= _MBUPPERLOW2_MT(_loc_update.GetLocaleT())) && (c2 <= _MBUPPERHIGH2_MT(_loc_update.GetLocaleT()))) ) c2 += _MBCASEDIFF2_MT(_loc_update.GetLocaleT()); } } else c2 = _mbbtolower_l(c2, _loc_update.GetLocaleT());
test: if (c1 != c2) return( (c1 > c2) ? 1 : -1);
if (c1 == 0) return(0); }
return(0);}
int (__cdecl _mbsnbicmp)( const unsigned char *s1, const unsigned char *s2, size_t n ){ return _mbsnbicmp_l(s1, s2, n, nullptr);}