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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121/****memicmp.cpp - compare memory, ignore case** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* defines _memicmp() - compare two blocks of memory for ordinal* order. Case is ignored in the comparison.********************************************************************************/#include <corecrt_internal.h>#include <ctype.h>#include <locale.h>#include <string.h>
/****int _memicmp(lhs, rhs, count) - compare two blocks of memory, ignore case**Purpose:* Compares count bytes of the two blocks of memory stored at lhs* and rhs. The characters are converted to lowercase before* comparing (not permanently), so case is ignored in the search.**Entry:* char *lhs, *rhs - memory buffers to compare* size_t count - maximum length to compare**Exit:* Returns < 0 if lhs < rhs* Returns 0 if lhs == rhs* Returns > 0 if lhs > rhs* Returns _NLSCMPERROR if something went wrong**Uses:**Exceptions:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" int __cdecl _memicmp_l ( void const * const lhs, void const * const rhs, size_t const count, _locale_t const plocinfo ){ /* validation section */ _VALIDATE_RETURN(lhs != nullptr || count == 0, EINVAL, _NLSCMPERROR); _VALIDATE_RETURN(rhs != nullptr || count == 0, EINVAL, _NLSCMPERROR);
if (count == 0) { return 0; }
unsigned char const * lhs_ptr = static_cast<unsigned char const *>(lhs); unsigned char const * rhs_ptr = static_cast<unsigned char const *>(rhs);
_LocaleUpdate _loc_update(plocinfo);
int result; size_t remaining = count; do { result = _tolower_fast_internal(*lhs_ptr++, _loc_update.GetLocaleT()) - _tolower_fast_internal(*rhs_ptr++, _loc_update.GetLocaleT()); } while (result == 0 && --remaining != 0);
return result;}
#if !defined(_M_IX86) || defined(_M_HYBRID_X86_ARM64)
extern "C" int __cdecl __ascii_memicmp ( void const * const lhs, void const * const rhs, size_t const count ){ if (count == 0) { return 0; }
unsigned char const * lhs_ptr = static_cast<unsigned char const *>(lhs); unsigned char const * rhs_ptr = static_cast<unsigned char const *>(rhs);
int result; size_t remaining = count; do { result = __ascii_tolower(*lhs_ptr++) - __ascii_tolower(*rhs_ptr++); } while (result == 0 && --remaining != 0);
return result;}
#endif /* !_M_IX86 || _M_HYBRID_X86_ARM64 */
extern "C" int __cdecl _memicmp ( void const * const lhs, void const * const rhs, size_t const count ){ if (!__acrt_locale_changed()) { /* validation section */ _VALIDATE_RETURN(lhs != nullptr || count == 0, EINVAL, _NLSCMPERROR); _VALIDATE_RETURN(rhs != nullptr || count == 0, EINVAL, _NLSCMPERROR);
return __ascii_memicmp(lhs, rhs, count); }
return _memicmp_l(lhs, rhs, count, nullptr);}