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/* Case-insensitive buffer comparator.
Copyright (C) 1996-1997, 2000, 2003, 2006, 2009-2015 Free Software
Foundation, Inc.
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/>. */
/* Written by Jim Meyering. */
#include <config.h>
#include "memcasecmp.h"
#include <ctype.h>
#include <limits.h>
/* Like memcmp, but ignore differences in case.
Convert to upper case (not lower) before comparing so that
join -i works with sort -f. */
int
memcasecmp (const void *vs1, const void *vs2, size_t n)
{
size_t i;
char const *s1 = vs1;
char const *s2 = vs2;
for (i = 0; i < n; i++)
{
unsigned char u1 = s1[i];
unsigned char u2 = s2[i];
int U1 = toupper (u1);
int U2 = toupper (u2);
int diff = (UCHAR_MAX <= INT_MAX ? U1 - U2
: U1 < U2 ? -1 : U2 < U1);
if (diff)
return diff;
}
return 0;
}
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