/* Compare at most N characters of two strings without taking care for

   the case.

   Copyright (C) 1992-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C 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.

   The GNU C 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 the GNU C Library; if not, see

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

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <string.h>

#include <ctype.h>

#ifndef weak_alias

# define __strncasecmp strncasecmp

# define TOLOWER(Ch) tolower (Ch)

#else

# include <locale/localeinfo.h>

# ifdef USE_IN_EXTENDED_LOCALE_MODEL

#  define __strncasecmp __strncasecmp_l

# endif

# define TOLOWER(Ch) __tolower_l ((Ch), loc)

#endif

#ifdef USE_IN_EXTENDED_LOCALE_MODEL

# define LOCALE_PARAM , locale_t loc

#else

# define LOCALE_PARAM

#endif

/* Compare no more than N characters of S1 and S2,

   ignoring case, returning less than, equal to or

   greater than zero if S1 is lexicographically less

   than, equal to or greater than S2.  */

int

__strncasecmp (const char *s1, const char *s2, size_t n LOCALE_PARAM)

{

#if defined _LIBC && !defined USE_IN_EXTENDED_LOCALE_MODEL

  locale_t loc = _NL_CURRENT_LOCALE;

#endif

  const unsigned char *p1 = (const unsigned char *) s1;

  const unsigned char *p2 = (const unsigned char *) s2;

  int result;

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

    return 0;

  while ((result = TOLOWER (*p1) - TOLOWER (*p2++)) == 0)

    if (*p1++ == '\0' || --n == 0)

      break;

  return result;

}

#ifndef __strncasecmp

weak_alias (__strncasecmp, strncasecmp)

#endif