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b4dba346cd
Everywhere. In documentation and code comments. It is almost never a good word and almost always a filler that should be avoided. Closes #20793
96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include "strcase.h"
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/*
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* curl_strequal() is for doing "raw" case insensitive strings. This is meant
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* to be locale independent and only compare strings we know are safe for
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* this. See https://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for
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* further explanations as to why this function is necessary.
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*/
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static int casecompare(const char *first, const char *second)
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{
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while(*first) {
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if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
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/* get out of the loop as soon as they do not match */
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return 0;
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first++;
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second++;
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}
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/* If we are here either the strings are the same or the length is different.
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We can test if the "current" character is non-zero for one and zero
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for the other. Note that the characters may not be exactly the same even
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if they match, we only want to compare zero-ness. */
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return !*first == !*second;
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}
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static int ncasecompare(const char *first, const char *second, size_t max)
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{
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while(*first && max) {
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if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
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return 0;
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max--;
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first++;
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second++;
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}
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if(max == 0)
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return 1; /* they are equal this far */
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return Curl_raw_toupper(*first) == Curl_raw_toupper(*second);
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}
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/*
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* Only "raw" case insensitive strings. This is meant to be locale independent
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* and only compare strings we know are safe for this.
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*
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* The function is capable of comparing a-z case insensitively.
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*
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* Result is 1 if text matches and 0 if not.
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*/
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/* --- public function --- */
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int curl_strequal(const char *s1, const char *s2)
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{
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if(s1 && s2)
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/* both pointers point to something then compare them */
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return casecompare(s1, s2);
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/* if both pointers are NULL then treat them as equal */
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return NULL == s1 && NULL == s2;
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}
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/* --- public function --- */
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int curl_strnequal(const char *s1, const char *s2, size_t n)
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{
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if(s1 && s2)
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/* both pointers point to something then compare them */
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return ncasecompare(s1, s2, n);
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/* if both pointers are NULL then treat them as equal if max is non-zero */
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return NULL == s1 && NULL == s2 && n;
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}
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