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/*
This file is part of libmicrohttpd
Copyright (C) 2015 Karlson2k (Evgeny Grin)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file microhttpd/mhd_str.c
* @brief Functions implementations for string manipulating
* @author Karlson2k (Evgeny Grin)
*/
#include "mhd_str.h"
#include "MHD_config.h"
#ifdef HAVE_STDBOOL_H
#include <stdbool.h>
#endif
/*
* Block of functions/macros that use US-ASCII charset as required by HTTP
* standards. Not affected by current locale settings.
*/
#ifdef INLINE_FUNC
/**
* Check whether character is lower case letter in US-ASCII
* @param c character to check
* @return non-zero if character is lower case letter, zero otherwise
*/
_MHD_inline _MHD_bool
isasciilower (char c)
{
return c >= 'a' && c <= 'z';
}
/**
* Check whether character is upper case letter in US-ASCII
* @param c character to check
* @return non-zero if character is upper case letter, zero otherwise
*/
_MHD_inline _MHD_bool
isasciiupper (char c)
{
return c >= 'A' && c <= 'Z';
}
/**
* Check whether character is letter in US-ASCII
* @param c character to check
* @return non-zero if character is letter in US-ASCII, zero otherwise
*/
_MHD_inline _MHD_bool
isasciialpha (char c)
{
return isasciilower (c) || isasciiupper (c);
}
/**
* Check whether character is decimal digit in US-ASCII
* @param c character to check
* @return non-zero if character is decimal digit, zero otherwise
*/
_MHD_inline _MHD_bool
isasciidigit (char c)
{
return c >= '0' && c <= '9';
}
/**
* Check whether character is decimal digit or letter in US-ASCII
* @param c character to check
* @return non-zero if character is decimal digit or letter, zero otherwise
*/
_MHD_inline _MHD_bool
isasciialmun (char c)
{
return isasciialpha (c) || isasciidigit (c);
}
/**
* Convert US-ASCII character to lower case.
* If character is upper case letter in US-ASCII than it's converted to lower
* case analog. If character is NOT upper case letter than it's returned
* unmodified.
* @param c character to check
* @return converted to lower case character
*/
_MHD_inline char
toasciilower (char c)
{
return isasciiupper (c) ? (c - 'A' + 'a') : c;
}
/**
* Convert US-ASCII character to upper case.
* If character is lower case letter in US-ASCII than it's converted to upper
* case analog. If character is NOT lower case letter than it's returned
* unmodified.
* @param c character to check
* @return converted to upper case character
*/
_MHD_inline char
toasciiupper (char c)
{
return isasciilower (c) ? (c - 'a' + 'A') : c;
}
#else /* !INLINE_FUNC */
/**
* Checks whether character is lower case letter in US-ASCII
* @param c character to check
* @return boolean true if character is lower case letter,
* boolean false otherwise
*/
#define isasciilower(c) (((char)(c)) >= 'a' && ((char)(c)) <= 'z')
/**
* Checks whether character is upper case letter in US-ASCII
* @param c character to check
* @return boolean true if character is upper case letter,
* boolean false otherwise
*/
#define isasciiupper(c) (((char)(c)) >= 'A' && ((char)(c)) <= 'Z')
/**
* Checks whether character is letter in US-ASCII
* @param c character to check
* @return boolean true if character is letter, boolean false
* otherwise
*/
#define isasciialpha(c) (isasciilower(c) || isasciiupper(c))
/**
* Check whether character is decimal digit in US-ASCII
* @param c character to check
* @return boolean true if character is decimal digit, boolean false
* otherwise
*/
#define isasciidigit(c) (((char)(c)) >= '0' && ((char)(c)) <= '9')
/**
* Check whether character is decimal digit or letter in US-ASCII
* @param c character to check
* @return boolean true if character is decimal digit or letter,
* boolean false otherwise
*/
#define isasciialmun(c) (isasciialpha(c) || isasciidigit(c))
/**
* Convert US-ASCII character to lower case.
* If character is upper case letter in US-ASCII than it's converted to lower
* case analog. If character is NOT upper case letter than it's returned
* unmodified.
* @param c character to check
* @return converted to lower case character
*/
#define toasciilower(c) ((isasciiupper(c)) ? (((char)(c)) - 'A' + 'a') : ((char)(c)))
/**
* Convert US-ASCII character to upper case.
* If character is lower case letter in US-ASCII than it's converted to upper
* case analog. If character is NOT lower case letter than it's returned
* unmodified.
* @param c character to check
* @return converted to upper case character
*/
#define toasciiupper(c) ((isasciilower(c)) ? (((char)(c)) - 'a' + 'A') : ((char)(c)))
#endif /* !INLINE_FUNC */
/**
* Check two string for equality, ignoring case of US-ASCII letters.
* @param str1 first string to compare
* @param str2 second string to compare
* @return non-zero if two strings are equal, zero otherwise.
*/
int
MHD_str_equal_caseless_ (const char * str1, const char * str2)
{
while (0 != (*str1))
{
const char c1 = *str1;
const char c2 = *str2;
if (c1 != c2 && toasciilower (c1) != toasciilower (c2))
return 0;
str1++;
str2++;
}
return 0 == (*str2);
}
/**
* Check two string for equality, ignoring case of US-ASCII letters and
* checking not more than @a maxlen characters.
* Compares up to first terminating null character, but not more than
* first @a maxlen characters.
* @param str1 first string to compare
* @param str2 second string to compare
* @patam maxlen maximum number of characters to compare
* @return non-zero if two strings are equal, zero otherwise.
*/
int
MHD_str_equal_caseless_n_ (const char * const str1, const char * const str2, size_t maxlen)
{
for (size_t i = 0; i < maxlen; ++i)
{
const char c1 = str1[i];
const char c2 = str2[i];
if (0 == c2)
return 0 == c1;
if (c1 != c2 && toasciilower (c1) != toasciilower (c2))
return 0;
}
return !0;
}
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