collcmp.c revision 17551 
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 <locale.h>
30
31/* will be removed ***************************/
32#include "collate.h"
33
34int __collcmp (c1, c2)
35	unsigned char c1, c2;
36{
37	return collate_range_cmp (c1, c2);
38}
39/* will be removed ***************************/
40
41int collate_range_cmp (c1, c2)
42	int c1, c2;
43{
44	static char s1[2], s2[2];
45
46	c1 &= UCHAR_MAX;
47	c2 &= UCHAR_MAX;
48	if (c1 == c2)
49		return (0);
50	if (   (isascii(c1) && isascii(c2))
51	    || (!isalpha(c1) && !isalpha(c2))
52	   )
53		return (c1 - c2);
54	if (isalpha(c1) && !isalpha(c2)) {
55		if (isupper(c1))
56			return ('A' - c2);
57		else
58			return ('a' - c2);
59	} else if (isalpha(c2) && !isalpha(c1)) {
60		if (isupper(c2))
61			return (c1 - 'A');
62		else
63			return (c1 - 'a');
64	}
65	if (isupper(c1) && islower(c2))
66		return (-1);
67	else if (islower(c1) && isupper(c2))
68		return (1);
69	s1[0] = c1;
70	s2[0] = c2;
71	return strcoll(s1, s2);
72}
73