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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, 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.
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
#include "strcase.h"
static char raw_tolower(char in);
/* Portable, consistent toupper. Do not use toupper() because its behavior is
altered by the current locale. */
char Curl_raw_toupper(char in)
{
if(in >= 'a' && in <= 'z')
return (char)('A' + in - 'a');
return in;
}
/* Portable, consistent tolower. Do not use tolower() because its behavior is
altered by the current locale. */
static char raw_tolower(char in)
{
if(in >= 'A' && in <= 'Z')
return (char)('a' + in - 'A');
return in;
}
/*
* Curl_strcasecompare() 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 some
* further explanation to why this function is necessary.
*
* @unittest: 1301
*/
int Curl_strcasecompare(const char *first, const char *second)
{
while(*first && *second) {
if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
/* get out of the loop as soon as they don't match */
break;
first++;
second++;
}
/* we do the comparison here (possibly again), just to make sure that if the
loop above is skipped because one of the strings reached zero, we must not
return this as a successful match */
return (Curl_raw_toupper(*first) == Curl_raw_toupper(*second));
}
int Curl_safe_strcasecompare(const char *first, const char *second)
{
if(first && second)
/* both pointers point to something then compare them */
return Curl_strcasecompare(first, second);
/* if both pointers are NULL then treat them as equal */
return (NULL == first && NULL == second);
}
/*
* @unittest: 1301
*/
int Curl_strncasecompare(const char *first, const char *second, size_t max)
{
while(*first && *second && max) {
if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second)) {
break;
}
max--;
first++;
second++;
}
if(0 == max)
return 1; /* they are equal this far */
return Curl_raw_toupper(*first) == Curl_raw_toupper(*second);
}
/* Copy an upper case version of the string from src to dest. The
* strings may overlap. No more than n characters of the string are copied
* (including any NUL) and the destination string will NOT be
* NUL-terminated if that limit is reached.
*/
void Curl_strntoupper(char *dest, const char *src, size_t n)
{
if(n < 1)
return;
do {
*dest++ = Curl_raw_toupper(*src);
} while(*src++ && --n);
}
/* Copy a lower case version of the string from src to dest. The
* strings may overlap. No more than n characters of the string are copied
* (including any NUL) and the destination string will NOT be
* NUL-terminated if that limit is reached.
*/
void Curl_strntolower(char *dest, const char *src, size_t n)
{
if(n < 1)
return;
do {
*dest++ = raw_tolower(*src);
} while(*src++ && --n);
}
/* Compare case-sensitive NUL-terminated strings, taking care of possible
* null pointers. Return true if arguments match.
*/
bool Curl_safecmp(char *a, char *b)
{
if(a && b)
return !strcmp(a, b);
return !a && !b;
}
/* --- public functions --- */
int curl_strequal(const char *first, const char *second)
{
return Curl_strcasecompare(first, second);
}
int curl_strnequal(const char *first, const char *second, size_t max)
{
return Curl_strncasecompare(first, second, max);
}
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