xref: /dragonfly/lib/libc/string/strcoll.c (revision e11c892a1bb7ee1cb93bffc15a26690533df90b3)
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