strxfrm.c revision 331722 
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 <sys/cdefs.h>
35__FBSDID("$FreeBSD: stable/11/lib/libc/string/strxfrm.c 331722 2018-03-29 02:50:57Z eadler $");
36
37#include <stdlib.h>
38#include <string.h>
39#include <errno.h>
40#include <wchar.h>
41#include "collate.h"
42
43size_t
44strxfrm_l(char * __restrict dest, const char * __restrict src, size_t len, locale_t loc);
45size_t
46strxfrm(char * __restrict dest, const char * __restrict src, size_t len)
47{
48	return strxfrm_l(dest, src, len, __get_locale());
49}
50
51size_t
52strxfrm_l(char * __restrict dest, const char * __restrict src, size_t len, locale_t locale)
53{
54	size_t slen;
55	size_t xlen;
56	wchar_t *wcs = NULL;
57
58	FIX_LOCALE(locale);
59	struct xlocale_collate *table =
60		(struct xlocale_collate*)locale->components[XLC_COLLATE];
61
62	if (!*src) {
63		if (len > 0)
64			*dest = '\0';
65		return (0);
66	}
67
68	/*
69	 * The conversion from multibyte to wide character strings is
70	 * strictly reducing (one byte of an mbs cannot expand to more
71	 * than one wide character.)
72	 */
73	slen = strlen(src);
74
75	if (table->__collate_load_error)
76		goto error;
77
78	if ((wcs = malloc((slen + 1) * sizeof (wchar_t))) == NULL)
79		goto error;
80
81	if (mbstowcs_l(wcs, src, slen + 1, locale) == (size_t)-1)
82		goto error;
83
84	if ((xlen = _collate_sxfrm(table, wcs, dest, len)) == (size_t)-1)
85		goto error;
86
87	free(wcs);
88
89	if (len > xlen) {
90		dest[xlen] = 0;
91	} else if (len) {
92		dest[len-1] = 0;
93	}
94
95	return (xlen);
96
97error:
98	/* errno should be set to ENOMEM if malloc failed */
99	free(wcs);
100	strlcpy(dest, src, len);
101
102	return (slen);
103}
104