1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2000, 2001 Alexey Zelkin <phantom@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include "namespace.h"
33#include <sys/types.h>
34#include <sys/stat.h>
35
36#include <errno.h>
37#include <fcntl.h>
38#include <limits.h>
39#include <stdlib.h>
40#include <string.h>
41#include <unistd.h>
42#include "un-namespace.h"
43
44#include "ldpart.h"
45#include "setlocale.h"
46
47static int split_lines(char *, const char *);
48
49int
50__part_load_locale(const char *name,
51		int *using_locale,
52		char **locale_buf,
53		const char *category_filename,
54		int locale_buf_size_max,
55		int locale_buf_size_min,
56		const char **dst_localebuf)
57{
58	int		saverr, fd, i, num_lines;
59	char		*lbuf, *p;
60	const char	*plim;
61	char		filename[PATH_MAX];
62	struct stat	st;
63	size_t		namesize, bufsize;
64
65	/* 'name' must be already checked. */
66	if (strcmp(name, "C") == 0 || strcmp(name, "POSIX") == 0 ||
67	    strncmp(name, "C.", 2) == 0) {
68		*using_locale = 0;
69		return (_LDP_CACHE);
70	}
71
72	/*
73	 * If the locale name is the same as our cache, use the cache.
74	 */
75	if (*locale_buf != NULL && strcmp(name, *locale_buf) == 0) {
76		*using_locale = 1;
77		return (_LDP_CACHE);
78	}
79
80	/*
81	 * Slurp the locale file into the cache.
82	 */
83	namesize = strlen(name) + 1;
84
85	/* 'PathLocale' must be already set & checked. */
86
87	/* Range checking not needed, 'name' size is limited */
88	strcpy(filename, _PathLocale);
89	strcat(filename, "/");
90	strcat(filename, name);
91	strcat(filename, "/");
92	strcat(filename, category_filename);
93	if ((fd = _open(filename, O_RDONLY | O_CLOEXEC)) < 0)
94		return (_LDP_ERROR);
95	if (_fstat(fd, &st) != 0)
96		goto bad_locale;
97	if (st.st_size <= 0) {
98		errno = EFTYPE;
99		goto bad_locale;
100	}
101	bufsize = namesize + st.st_size;
102	if ((lbuf = malloc(bufsize)) == NULL) {
103		errno = ENOMEM;
104		goto bad_locale;
105	}
106	(void)strcpy(lbuf, name);
107	p = lbuf + namesize;
108	plim = p + st.st_size;
109	if (_read(fd, p, (size_t) st.st_size) != st.st_size)
110		goto bad_lbuf;
111	/*
112	 * Parse the locale file into localebuf.
113	 */
114	if (plim[-1] != '\n') {
115		errno = EFTYPE;
116		goto bad_lbuf;
117	}
118	num_lines = split_lines(p, plim);
119	if (num_lines >= locale_buf_size_max)
120		num_lines = locale_buf_size_max;
121	else if (num_lines >= locale_buf_size_min)
122		num_lines = locale_buf_size_min;
123	else {
124		errno = EFTYPE;
125		goto bad_lbuf;
126	}
127	(void)_close(fd);
128	/*
129	 * Record the successful parse in the cache.
130	 */
131	if (*locale_buf != NULL)
132		free(*locale_buf);
133	*locale_buf = lbuf;
134	for (p = *locale_buf, i = 0; i < num_lines; i++)
135		dst_localebuf[i] = (p += strlen(p) + 1);
136	for (i = num_lines; i < locale_buf_size_max; i++)
137		dst_localebuf[i] = NULL;
138	*using_locale = 1;
139
140	return (_LDP_LOADED);
141
142bad_lbuf:
143	saverr = errno;
144	free(lbuf);
145	errno = saverr;
146bad_locale:
147	saverr = errno;
148	(void)_close(fd);
149	errno = saverr;
150
151	return (_LDP_ERROR);
152}
153
154static int
155split_lines(char *p, const char *plim)
156{
157	int i;
158
159	i = 0;
160	while (p < plim) {
161		if (*p == '\n') {
162			*p = '\0';
163			i++;
164		}
165		p++;
166	}
167	return (i);
168}
169
170