collcmp.c revision 17556 
117530Sache/*
217530Sache * Copyright (C) 1996 by Andrey A. Chernov, Moscow, Russia.
317530Sache * All rights reserved.
417530Sache *
517530Sache * Redistribution and use in source and binary forms, with or without
617530Sache * modification, are permitted provided that the following conditions
717530Sache * are met:
817530Sache * 1. Redistributions of source code must retain the above copyright
917530Sache *    notice, this list of conditions and the following disclaimer.
1017530Sache * 2. Redistributions in binary form must reproduce the above copyright
1117530Sache *    notice, this list of conditions and the following disclaimer in the
1217530Sache *    documentation and/or other materials provided with the distribution.
1317530Sache *
1417530Sache * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
1517530Sache * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1617530Sache * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1717530Sache * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1817530Sache * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1917530Sache * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2017530Sache * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2117530Sache * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2217530Sache * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2317530Sache * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2417530Sache * SUCH DAMAGE.
2517530Sache */
2617530Sache
2717530Sache#include <ctype.h>
2817530Sache#include <string.h>
2917556Sache#include <limits.h>
3017551Sache#include <locale.h>
3117551Sache
3217551Sacheint collate_range_cmp (c1, c2)
3317551Sache	int c1, c2;
3417551Sache{
3517530Sache	static char s1[2], s2[2];
3617530Sache
3717551Sache	c1 &= UCHAR_MAX;
3817551Sache	c2 &= UCHAR_MAX;
3917530Sache	if (c1 == c2)
4017530Sache		return (0);
4117530Sache	if (   (isascii(c1) && isascii(c2))
4217530Sache	    || (!isalpha(c1) && !isalpha(c2))
4317530Sache	   )
4417551Sache		return (c1 - c2);
4517530Sache	if (isalpha(c1) && !isalpha(c2)) {
4617530Sache		if (isupper(c1))
4717551Sache			return ('A' - c2);
4817530Sache		else
4917551Sache			return ('a' - c2);
5017530Sache	} else if (isalpha(c2) && !isalpha(c1)) {
5117530Sache		if (isupper(c2))
5217551Sache			return (c1 - 'A');
5317530Sache		else
5417551Sache			return (c1 - 'a');
5517530Sache	}
5617530Sache	if (isupper(c1) && islower(c2))
5717530Sache		return (-1);
5817530Sache	else if (islower(c1) && isupper(c2))
5917530Sache		return (1);
6017551Sache	s1[0] = c1;
6117551Sache	s2[0] = c2;
6217530Sache	return strcoll(s1, s2);
6317530Sache}
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