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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133/****wcsnicmp.cpp - compare n chars of wide-character strings, ignoring case** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* defines _wcsnicmp() - Compares at most n characters of two wchar_t* strings, without regard to case.********************************************************************************/#include <corecrt_internal.h>#include <ctype.h>#include <corecrt_internal_securecrt.h>#include <locale.h>#include <string.h>
/****int _wcsnicmp(lhs, rhs, count) - compares count wchar_t of strings,* ignore case**Purpose:* Compare the two strings for ordinal order. Stops the comparison* when the following occurs: (1) strings differ, (2) the end of the* strings is reached, or (3) count characters have been compared.* For the purposes of the comparison, upper case characters are* converted to lower case (wide-characters).**Entry:* wchar_t *lhs, *rhs - strings to compare* size_t count - maximum number of characters to compare**Exit:* Returns -1 if lhs < rhs* Returns 0 if lhs == rhs* Returns 1 if lhs > rhs* Returns _NLSCMPERROR if something went wrong* This range of return values may differ from other *cmp/*coll functions.**Exceptions:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" int __cdecl _wcsnicmp_l ( wchar_t const * const lhs, wchar_t const * const rhs, size_t const count, _locale_t const plocinfo ){ /* validation section */ _VALIDATE_RETURN(lhs != nullptr, EINVAL, _NLSCMPERROR); _VALIDATE_RETURN(rhs != nullptr, EINVAL, _NLSCMPERROR);
if (count == 0) { return 0; }
_LocaleUpdate _loc_update(plocinfo);
// This check is still worth doing for wide but not narrow because // we need to consult the UTF-16 ctype map for towlower operations. if (_loc_update.GetLocaleT()->locinfo->locale_name[LC_CTYPE] == nullptr) { return __ascii_wcsnicmp(lhs, rhs, count); }
unsigned short const * lhs_ptr = reinterpret_cast<unsigned short const *>(lhs); unsigned short const * rhs_ptr = reinterpret_cast<unsigned short const *>(rhs);
int result; int lhs_value; int rhs_value; size_t remaining = count; do { lhs_value = _towlower_internal(*lhs_ptr++, _loc_update.GetLocaleT()); rhs_value = _towlower_internal(*rhs_ptr++, _loc_update.GetLocaleT()); result = lhs_value - rhs_value; } while (result == 0 && lhs_value != 0 && --remaining != 0);
return result;}
extern "C" int __cdecl __ascii_wcsnicmp( wchar_t const * const lhs, wchar_t const * const rhs, size_t const count ){ if (count == 0) { return 0; }
unsigned short const * lhs_ptr = reinterpret_cast<unsigned short const *>(lhs); unsigned short const * rhs_ptr = reinterpret_cast<unsigned short const *>(rhs);
int result; int lhs_value; int rhs_value; size_t remaining = count; do { lhs_value = __ascii_towlower(*lhs_ptr++); rhs_value = __ascii_towlower(*rhs_ptr++); result = lhs_value - rhs_value; } while (result == 0 && lhs_value != 0 && --remaining != 0);
return result;}
extern "C" int __cdecl _wcsnicmp ( wchar_t const * const lhs, wchar_t const * const rhs, size_t const count ){ if (!__acrt_locale_changed()) { /* validation section */ _VALIDATE_RETURN(lhs != nullptr, EINVAL, _NLSCMPERROR); _VALIDATE_RETURN(rhs != nullptr, EINVAL, _NLSCMPERROR);
return __ascii_wcsnicmp(lhs, rhs, count); }
return _wcsnicmp_l(lhs, rhs, count, nullptr);}