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 #define _GNU_SOURCE
28 #include <sys/cdefs.h>
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
__collate_range_cmp(int c1,int c2)44 int __collate_range_cmp (int c1, int 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
