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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
#include "strcase.h"
/*
* curl_strequal() is for doing "raw" case insensitive strings. This is meant
* to be locale independent and only compare strings we know are safe for
* this. See https://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for
* further explanations as to why this function is necessary.
*/
static int casecompare(const char *first, const char *second)
{
while(*first) {
if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
/* get out of the loop as soon as they do not match */
return 0;
first++;
second++;
}
/* If we are here either the strings are the same or the length is different.
We can just test if the "current" character is non-zero for one and zero
for the other. Note that the characters may not be exactly the same even
if they match, we only want to compare zero-ness. */
return !*first == !*second;
}
static int ncasecompare(const char *first, const char *second, size_t max)
{
while(*first && max) {
if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
return 0;
max--;
first++;
second++;
}
if(0 == max)
return 1; /* they are equal this far */
return Curl_raw_toupper(*first) == Curl_raw_toupper(*second);
}
/* --- public function --- */
int curl_strequal(const char *first, const char *second)
{
if(first && second)
/* both pointers point to something then compare them */
return casecompare(first, second);
/* if both pointers are NULL then treat them as equal */
return NULL == first && NULL == second;
}
/* --- public function --- */
int curl_strnequal(const char *first, const char *second, size_t max)
{
if(first && second)
/* both pointers point to something then compare them */
return ncasecompare(first, second, max);
/* if both pointers are NULL then treat them as equal if max is non-zero */
return NULL == first && NULL == second && max;
}
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