1 /*
2 * Copyright 2010 Nexenta Systems, Inc. All rights reserved.
3 * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
4 * at Electronni Visti IA, Kiev, Ukraine.
5 * All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <stdlib.h>
35 #include <string.h>
36 #include <errno.h>
37 #include <wchar.h>
38 #include "collate.h"
39
40
41 /*
42 * In order to properly handle multibyte locales, its easiest to just
43 * convert to wide characters and then use wcscoll. However if an
44 * error occurs, we gracefully fall back to simple strcmp. Caller
45 * should check errno.
46 */
47 int
strcoll_l(const char * s,const char * s2,locale_t locale)48 strcoll_l(const char *s, const char *s2, locale_t locale)
49 {
50 int ret;
51 wchar_t *t1 = NULL, *t2 = NULL;
52 wchar_t *w1 = NULL, *w2 = NULL;
53 const char *cs1, *cs2;
54 mbstate_t mbs1;
55 mbstate_t mbs2;
56 size_t sz1, sz2;
57
58 memset(&mbs1, 0, sizeof(mbstate_t));
59 memset(&mbs2, 0, sizeof(mbstate_t));
60
61 /*
62 * The mbsrtowcs_l function can set the src pointer to null upon
63 * failure, so it should act on a copy to avoid:
64 * - sending null pointer to strcmp
65 * - having strcoll/strcoll_l change *s or *s2 to null
66 */
67 cs1 = s;
68 cs2 = s2;
69
70 FIX_LOCALE(locale);
71 struct xlocale_collate *table =
72 (struct xlocale_collate*)locale->components[XLC_COLLATE];
73
74 if (table->__collate_load_error)
75 goto error;
76
77 sz1 = strlen(s) + 1;
78 sz2 = strlen(s2) + 1;
79
80 /*
81 * Simple assumption: conversion to wide format is strictly
82 * reducing, i.e. a single byte (or multibyte character)
83 * cannot result in multiple wide characters.
84 */
85 if ((t1 = malloc(sz1 * sizeof (wchar_t))) == NULL)
86 goto error;
87 w1 = t1;
88 if ((t2 = malloc(sz2 * sizeof (wchar_t))) == NULL)
89 goto error;
90 w2 = t2;
91
92 if ((mbsrtowcs_l(w1, &cs1, sz1, &mbs1, locale)) == (size_t)-1)
93 goto error;
94
95 if ((mbsrtowcs_l(w2, &cs2, sz2, &mbs2, locale)) == (size_t)-1)
96 goto error;
97
98 ret = wcscoll_l(w1, w2, locale);
99 free(t1);
100 free(t2);
101
102 return (ret);
103
104 error:
105 if (t1)
106 free(t1);
107 if (t2)
108 free(t2);
109 return (strcmp(s, s2));
110 }
111
112 int
strcoll(const char * s,const char * s2)113 strcoll(const char *s, const char *s2)
114 {
115 return strcoll_l(s, s2, __get_locale());
116 }
117