+
−/* Case-insensitive buffer comparator.
+
−   Copyright (C) 1996-1997, 2000, 2003, 2006, 2009-2013 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;
+
−}