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 */
49int
50strcoll_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
103error:
104	if (t1)
105		free(t1);
106	if (t2)
107		free(t2);
108	return (strcmp(s1, s2));
109}
110
111int
112strcoll(const char *s1, const char *s2)
113{
114	return (strcoll_l(s1, s2, uselocale(NULL)));
115}
116