collcmp.c revision 22993 
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 * $Id$
27 */
28
29#define ASCII_COMPATIBLE_COLLATE        /* see usr.bin/colldef/data */
30
31#include <string.h>
32#include "collate.h"
33#ifndef ASCII_COMPATIBLE_COLLATE
34#include <ctype.h>
35#endif
36
37/* Temporary backward compatibility */
38
39int collate_range_cmp (c1, c2)
40	int c1, c2;
41{
42	return __collate_range_cmp(c1, c2);
43}
44
45
46/*
47 * Compare two characters converting collate information
48 * into ASCII-compatible range, it allows to handle
49 * "[a-z]"-type ranges with national characters.
50 */
51
52int __collate_range_cmp (c1, c2)
53	int c1, c2;
54{
55	static char s1[2], s2[2];
56	int ret;
57#ifndef ASCII_COMPATIBLE_COLLATE
58	int as1, as2, al1, al2;
59#endif
60
61	c1 &= UCHAR_MAX;
62	c2 &= UCHAR_MAX;
63	if (c1 == c2)
64		return (0);
65
66#ifndef ASCII_COMPATIBLE_COLLATE
67	as1 = isascii(c1);
68	as2 = isascii(c2);
69	al1 = isalpha(c1);
70	al2 = isalpha(c2);
71
72	if (as1 || as2 || al1 || al2) {
73		if ((as1 && as2) || (!al1 && !al2))
74			return (c1 - c2);
75		if (al1 && !al2) {
76			if (isupper(c1))
77				return ('A' - c2);
78			else
79				return ('a' - c2);
80		} else if (al2 && !al1) {
81			if (isupper(c2))
82				return (c1 - 'A');
83			else
84				return (c1 - 'a');
85		}
86	}
87#endif
88	s1[0] = c1;
89	s2[0] = c2;
90	if ((ret = strcoll(s1, s2)) != 0)
91		return (ret);
92	return (c1 - c2);
93}
94