1 /*
2 * Copyright 2013 Garrett D'Amore <garrett@damore.org>
3 * Copyright 2010 Nexenta Systems, Inc. All rights reserved.
4 * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
5 * at Electronni Visti IA, Kiev, Ukraine.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include "lint.h"
31 #include "file64.h"
32 #include <alloca.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <errno.h>
36 #include <wchar.h>
37 #include <xlocale.h>
38 #include "localeimpl.h"
39 #include "collate.h"
40
41 #define ALLOCA_LIMIT 16
42
43 /*
44 * In order to properly handle multibyte locales, its easiet to just
45 * convert to wide characters and then use wcscoll. However if an
46 * error occurs, we gracefully fall back to simple strcmp. Caller
47 * should check errno.
48 */
49 int
strcoll_l(const char * s1,const char * s2,locale_t loc)50 strcoll_l(const char *s1, const char *s2, locale_t loc)
51 {
52 int ret;
53 wchar_t *t1 = NULL, *t2 = NULL;
54 wchar_t *w1 = NULL, *w2 = NULL;
55 size_t sz1, sz2;
56 const struct lc_collate *lcc = loc->collate;
57
58 if (lcc->lc_is_posix)
59 return (strcmp(s1, s2));
60
61 sz1 = strlen(s1) + 1;
62 sz2 = strlen(s2) + 1;
63
64 /*
65 * Simple assumption: conversion to wide format is strictly
66 * reducing, i.e. a single byte (or multibyte character)
67 * cannot result in multiple wide characters.
68 *
69 * We gain a bit of performance by giving preference to alloca
70 * for small string allocations.
71 */
72 if (sz1 > ALLOCA_LIMIT) {
73 if ((t1 = malloc(sz1 * sizeof (wchar_t))) == NULL)
74 goto error;
75 w1 = t1;
76 } else {
77 if ((w1 = alloca(sz1 * sizeof (wchar_t))) == NULL)
78 goto error;
79 }
80 if (sz2 > ALLOCA_LIMIT) {
81 if ((t2 = malloc(sz2 * sizeof (wchar_t))) == NULL)
82 goto error;
83 w2 = t2;
84 } else {
85 if ((w2 = alloca(sz2 * sizeof (wchar_t))) == NULL)
86 goto error;
87 }
88
89 if ((mbstowcs_l(w1, s1, sz1, loc)) == (size_t)-1)
90 goto error;
91
92 if ((mbstowcs_l(w2, s2, sz2, loc)) == (size_t)-1)
93 goto error;
94
95 ret = wcscoll_l(w1, w2, loc);
96 if (t1)
97 free(t1);
98 if (t2)
99 free(t2);
100
101 return (ret);
102
103 error:
104 if (t1)
105 free(t1);
106 if (t2)
107 free(t2);
108 return (strcmp(s1, s2));
109 }
110
111 int
strcoll(const char * s1,const char * s2)112 strcoll(const char *s1, const char *s2)
113 {
114 return (strcoll_l(s1, s2, uselocale(NULL)));
115 }
116