collcmp.c revision 17530 
1/*
2 * Copyright (C) 1996 by Andrey A. Chernov, Moscow, Russia.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <ctype.h>
28#include <string.h>
29#include "collate.h"
30
31int __collcmp (c1, c2)
32	u_char c1, c2;
33{
34	static char s1[2], s2[2];
35
36	if (c1 == c2)
37		return (0);
38	if (   (isascii(c1) && isascii(c2))
39	    || (!isalpha(c1) && !isalpha(c2))
40	   )
41		return (((int)c1) - ((int)c2));
42	if (isalpha(c1) && !isalpha(c2)) {
43		if (isupper(c1))
44			return ('A' - ((int)c2));
45		else
46			return ('a' - ((int)c2));
47	} else if (isalpha(c2) && !isalpha(c1)) {
48		if (isupper(c2))
49			return (((int)c1) - 'A');
50		else
51			return (((int)c1) - 'a');
52	}
53	if (isupper(c1) && islower(c2))
54		return (-1);
55	else if (islower(c1) && isupper(c2))
56		return (1);
57	s1[0] = (char) c1;
58	s2[0] = (char) c2;
59	return strcoll(s1, s2);
60}
61
62