/* strcasecmp.c - case-insensitive strcmp

   Copyright 2008, 2010 Karl Berry.
   Copyright 1991, 1992, 1995 Free Software Foundation, Inc.
   This file was part of the GNU C Library.
   Modified by Karl Berry for kpathsea.

   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, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <ctype.h>

/* Compare S1 and S2, ignoring case, returning less than, equal to or
   greater than zero if S1 is lexiographically less than,
   equal to or greater than S2.  */
int
strcasecmp (s1, s2)
    const char *s1;
    const char *s2;
{
  register const unsigned char *p1 = (const unsigned char *) s1;
  register const unsigned char *p2 = (const unsigned char *) s2;
  unsigned char c1, c2;

  if (p1 == p2)
    return 0;

  do
    {
      c1 = tolower (*p1++);
      c2 = tolower (*p2++);
      if (c1 == '\0')
        break;
    }
  while (c1 == c2);

  return c1 - c2;
}

int
strncasecmp (s1, s2, n)
    const char *s1;
    const char *s2;
    unsigned n;
{
  register const unsigned char *p1 = (const unsigned char *) s1;
  register const unsigned char *p2 = (const unsigned char *) s2;
  unsigned char c1, c2;

  if (p1 == p2 || n == 0)
    return 0;

  do
    {
      c1 = tolower (*p1++);
      c2 = tolower (*p2++);
      if (c1 == '\0' || c1 != c2)
        return c1 - c2;
    } while (--n > 0);

  return c1 - c2;
}
