collcmp.c revision 118376 
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 <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libc/locale/collcmp.c 118376 2003-08-03 04:40:40Z ache $");
29
30#define ASCII_COMPATIBLE_COLLATE        /* see share/colldef */
31
32#include <string.h>
33#include "collate.h"
34#ifndef ASCII_COMPATIBLE_COLLATE
35#include <ctype.h>
36#endif
37
38/*
39 * Compare two characters converting collate information
40 * into ASCII-compatible range, it allows to handle
41 * "[a-z]"-type ranges with national characters.
42 */
43
44int __collate_range_cmp(c1, c2)
45	int c1, c2;
46{
47	static char s1[2], s2[2];
48#ifndef ASCII_COMPATIBLE_COLLATE
49	int as1, as2, al1, al2;
50#endif
51
52#ifndef ASCII_COMPATIBLE_COLLATE
53	as1 = isascii(c1);
54	as2 = isascii(c2);
55	al1 = isalpha(c1);
56	al2 = isalpha(c2);
57
58	if (as1 || as2 || al1 || al2) {
59		if ((as1 && as2) || (!al1 && !al2))
60			return (c1 - c2);
61		if (al1 && !al2) {
62			if (isupper(c1))
63				return ('A' - c2);
64			else
65				return ('a' - c2);
66		} else if (al2 && !al1) {
67			if (isupper(c2))
68				return (c1 - 'A');
69			else
70				return (c1 - 'a');
71		}
72	}
73#endif
74	s1[0] = c1;
75	s2[0] = c2;
76	return (strcoll(s1, s2));
77}
78