strcasecmp.c
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	/* Case-insensitive string comparison function.
	Copyright (C) 1998, 1999, 2005 Free Software Foundation, Inc.
	Written by Bruno Haible <bruno@clisp.org>, 2005,
	based on earlier glibc code.

	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 2, 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, write to the Free Software Foundation,
	Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */

	#include "defines.h"

	#if HAVE_MBRTOWC
	# include "mbuiter.h"
	#endif

	#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))

	/* Compare strings 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.
	Note: This function may, in multibyte locales, return 0 for strings of
	different lengths! */
	int
	rpl_strcasecmp (const char s1, const char s2)
	{
	if (s1 == s2)
	return 0;

	/* Be careful not to look at the entire extent of s1 or s2 until needed.
	This is useful because when two strings differ, the difference is
	most often already in the very few first characters. */
	#if HAVE_MBRTOWC
	if (MB_CUR_MAX > 1)
	{
	mbui_iterator_t iter1;
	mbui_iterator_t iter2;

	mbui_init (iter1, s1);
	mbui_init (iter2, s2);

	while (mbui_avail (iter1) && mbui_avail (iter2))
	{
	int cmp = mb_casecmp (mbui_cur (iter1), mbui_cur (iter2));

	if (cmp != 0)
	return cmp;

	mbui_advance (iter1);
	mbui_advance (iter2);
	}
	if (mbui_avail (iter1))
	/* s2 terminated before s1. */
	return 1;
	if (mbui_avail (iter2))
	/* s1 terminated before s2. */
	return -1;
	return 0;
	}
	else
	#endif
	{
	const unsigned char p1 = (const unsigned char ) s1;
	const unsigned char p2 = (const unsigned char ) s2;
	unsigned char c1, c2;

	do
	{
	c1 = TOLOWER (*p1);
	c2 = TOLOWER (*p2);

	if (c1 == '\0')
	break;

	++p1;
	++p2;
	}
	while (c1 == c2);

	if (UCHAR_MAX <= INT_MAX)
	return c1 - c2;
	else
	/* On machines where 'char' and 'int' are types of the same size, the
	difference of two 'unsigned char' values - including the sign bit -
	doesn't fit in an 'int'. */
	return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
	}
	}

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