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/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <wchar.h>
/* TODO #include <wctype.h> */
/**
* Compare two strings alphabetically in a case insensitive manner.
* Be aware, only ASCII characters are case insensitive, non-ASCII
* characters are case sensitive.
*
* This is a GNU-compliant slibc extension.
*
* @param a A negative value is returned if this is the lesser.
* @param b A positive value is returned if this is the lesser.
* @param length The maximum number of characters to compare.
* @return Zero is returned if `a` and `b` are equal, otherwise,
* see the specifications for `a` and `b`.
*/
int wcsncasecmp(const wchar_t* a, const wchar_t* b, size_t length)
{
wchar_t c1, c2;
for (; length--; a++, b++)
if (*a != *b)
{
c1 = iswalpha(*a) ? towlower(*a) : *a;
c2 = iswalpha(*b) ? towlower(*b) : *b;
if (c1 < c2) return -1;
if (c1 > c2) return +1;
}
else if (!*a && !*b) return 0;
else if (!*a) return -1;
else if (!*b) return +1;
return 0;
}
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