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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143/****mbsicmp.c - Case-insensitive string comparision routine (MBCS)** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Case-insensitive string comparision routine (MBCS)********************************************************************************/#ifndef _MBCS #error This file should only be compiled with _MBCS defined#endif
#include <corecrt_internal.h>#include <corecrt_internal_mbstring.h>#include <locale.h>#include <string.h>
#pragma warning(disable:__WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26018
/**** _mbsicmp - Case-insensitive string comparision routine (MBCS)**Purpose:* Compares two strings for ordinal order without regard to case.* Strings are compared on a character basis, not a byte basis.**Entry:* char *s1, *s2 = strings to compare**Exit:* Returns <0 if s1 < s2* Returns 0 if s1 == s2* Returns >0 if s1 > s2* Returns _NLSCMPERROR if something went wrong**Exceptions:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" int __cdecl _mbsicmp_l( const unsigned char *s1, const unsigned char *s2, _locale_t plocinfo ){ unsigned short c1, c2; _LocaleUpdate _loc_update(plocinfo); int retval; unsigned char szResult[4];
/* validation section */ _VALIDATE_RETURN(s1 != nullptr, EINVAL, _NLSCMPERROR); _VALIDATE_RETURN(s2 != nullptr, EINVAL, _NLSCMPERROR);
if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0) return _stricmp_l((const char *)s1, (const char *)s2, _loc_update.GetLocaleT());
for (;;) { c1 = *s1++; if ( _ismbblead_l(c1, _loc_update.GetLocaleT()) ) { if (*s1 == '\0') c1 = 0; else { retval = __acrt_LCMapStringA( _loc_update.GetLocaleT(), _loc_update.GetLocaleT()->mbcinfo->mblocalename, LCMAP_UPPERCASE, (LPCSTR)s1 - 1, 2, (LPSTR)szResult, 2, _loc_update.GetLocaleT()->mbcinfo->mbcodepage, TRUE );
if (retval == 1) c1 = szResult[0]; else if (retval == 2) c1 = (szResult[0] << 8) + szResult[1]; else { errno = EINVAL; return _NLSCMPERROR; } s1++; } } else c1 = _mbbtolower_l(c1, _loc_update.GetLocaleT());
c2 = *s2++; if ( _ismbblead_l(c2, _loc_update.GetLocaleT()) ) { if (*s2 == '\0') c2 = 0; else { retval = __acrt_LCMapStringA( _loc_update.GetLocaleT(), _loc_update.GetLocaleT()->mbcinfo->mblocalename, LCMAP_UPPERCASE, (LPCSTR)s2 - 1, 2, (LPSTR)szResult, 2, _loc_update.GetLocaleT()->mbcinfo->mbcodepage, TRUE );
if (retval == 1) c2 = szResult[0]; else if (retval == 2) c2 = (szResult[0] << 8) + szResult[1]; else { errno = EINVAL; return _NLSCMPERROR; } s2++; } } else c2 = _mbbtolower_l(c2, _loc_update.GetLocaleT());
if (c1 != c2) return( (c1 > c2) ? 1 : -1 );
if (c1 == 0) return(0); }}
extern "C" int (__cdecl _mbsicmp)( const unsigned char *s1, const unsigned char *s2 ){ return _mbsicmp_l(s1, s2, nullptr);}