collcmp.c revision 62758 
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 * $FreeBSD: head/lib/libc/locale/collcmp.c 62758 2000-07-07 08:24:50Z ache $
27 */
28
29#define ASCII_COMPATIBLE_COLLATE        /* see share/colldef */
30
31#include <string.h>
32#include "collate.h"
33#ifndef ASCII_COMPATIBLE_COLLATE
34#include <ctype.h>
35#endif
36
37/*
38 * Compare two characters converting collate information
39 * into ASCII-compatible range, it allows to handle
40 * "[a-z]"-type ranges with national characters.
41 */
42
43int __collate_range_cmp (c1, c2)
44	int c1, c2;
45{
46	static char s1[2], s2[2];
47	int ret;
48#ifndef ASCII_COMPATIBLE_COLLATE
49	int as1, as2, al1, al2;
50#endif
51
52	c1 &= UCHAR_MAX;
53	c2 &= UCHAR_MAX;
54	if (c1 == c2)
55		return (0);
56
57#ifndef ASCII_COMPATIBLE_COLLATE
58	as1 = isascii(c1);
59	as2 = isascii(c2);
60	al1 = isalpha(c1);
61	al2 = isalpha(c2);
62
63	if (as1 || as2 || al1 || al2) {
64		if ((as1 && as2) || (!al1 && !al2))
65			return (c1 - c2);
66		if (al1 && !al2) {
67			if (isupper(c1))
68				return ('A' - c2);
69			else
70				return ('a' - c2);
71		} else if (al2 && !al1) {
72			if (isupper(c2))
73				return (c1 - 'A');
74			else
75				return (c1 - 'a');
76		}
77	}
78#endif
79	s1[0] = c1;
80	s2[0] = c2;
81	if ((ret = strcoll(s1, s2)) != 0)
82		return (ret);
83	return (c1 - c2);
84}
85