1/*-
2 * Copyright (c) 2002 Tim J. Robbins
3 * All rights reserved.
4 *
5 * Copyright (c) 2011 The FreeBSD Foundation
6 * All rights reserved.
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD$");
34
35#include <errno.h>
36#include <stdlib.h>
37#include <string.h>
38#include <wchar.h>
39#include "collate.h"
40
41static char *__mbsdup(const wchar_t *);
42
43/*
44 * Placeholder implementation of wcscoll(). Attempts to use the single-byte
45 * collation ordering where possible, and falls back on wcscmp() in locales
46 * with extended character sets.
47 */
48int
49wcscoll_l(const wchar_t *ws1, const wchar_t *ws2, locale_t locale)
50{
51	char *mbs1, *mbs2;
52	int diff, sverrno;
53	FIX_LOCALE(locale);
54	struct xlocale_collate *table =
55		(struct xlocale_collate*)locale->components[XLC_COLLATE];
56
57	if (table->__collate_load_error || MB_CUR_MAX > 1)
58		/*
59		 * Locale has no special collating order, could not be
60		 * loaded, or has an extended character set; do a fast binary
61		 * comparison.
62		 */
63		return (wcscmp(ws1, ws2));
64
65	if ((mbs1 = __mbsdup(ws1)) == NULL || (mbs2 = __mbsdup(ws2)) == NULL) {
66		/*
67		 * Out of memory or illegal wide chars; fall back to wcscmp()
68		 * but leave errno indicating the error. Callers that don't
69		 * check for error will get a reasonable but often slightly
70		 * incorrect result.
71		 */
72		sverrno = errno;
73		free(mbs1);
74		errno = sverrno;
75		return (wcscmp(ws1, ws2));
76	}
77
78	diff = strcoll_l(mbs1, mbs2, locale);
79	sverrno = errno;
80	free(mbs1);
81	free(mbs2);
82	errno = sverrno;
83
84	return (diff);
85}
86
87int
88wcscoll(const wchar_t *ws1, const wchar_t *ws2)
89{
90	return wcscoll_l(ws1, ws2, __get_locale());
91}
92
93static char *
94__mbsdup(const wchar_t *ws)
95{
96	static const mbstate_t initial;
97	mbstate_t st;
98	const wchar_t *wcp;
99	size_t len;
100	char *mbs;
101
102	wcp = ws;
103	st = initial;
104	if ((len = wcsrtombs(NULL, &wcp, 0, &st)) == (size_t)-1)
105		return (NULL);
106	if ((mbs = malloc(len + 1)) == NULL)
107		return (NULL);
108	st = initial;
109	wcsrtombs(mbs, &ws, len + 1, &st);
110
111	return (mbs);
112}
113