ldpart.c revision 116274 
1/*
2 * Copyright (c) 2000, 2001 Alexey Zelkin <phantom@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libc/locale/ldpart.c 116274 2003-06-13 00:14:07Z jkh $");
29
30#include "namespace.h"
31#include <sys/types.h>
32#include <sys/stat.h>
33
34#include <errno.h>
35#include <fcntl.h>
36#include <limits.h>
37#include <stdlib.h>
38#include <string.h>
39#include <unistd.h>
40#include "un-namespace.h"
41
42#include "setlocale.h"
43#include "ldpart.h"
44
45static int split_lines(char *, const char *);
46
47int
48__part_load_locale(const char *name,
49		int *using_locale,
50		char **locale_buf,
51		const char *category_filename,
52		int locale_buf_size_max,
53		int locale_buf_size_min,
54		const char **dst_localebuf)
55{
56	int		saverr, fd, i, num_lines;
57	char		*lbuf, *p;
58	const char	*plim;
59	char		filename[PATH_MAX];
60	struct stat	st;
61	size_t		namesize, bufsize;
62
63	/* 'name' must be already checked. */
64	if (strcmp(name, "C") == 0 || strcmp(name, "POSIX") == 0) {
65		*using_locale = 0;
66		return (_LDP_CACHE);
67	}
68
69	/*
70	 * If the locale name is the same as our cache, use the cache.
71	 */
72	if (*locale_buf != NULL && strcmp(name, *locale_buf) == 0) {
73		*using_locale = 1;
74		return (_LDP_CACHE);
75	}
76
77	/*
78	 * Slurp the locale file into the cache.
79	 */
80	namesize = strlen(name) + 1;
81
82	/* 'PathLocale' must be already set & checked. */
83	/* Range checking not needed, 'name' size is limited */
84	strcpy(filename, _PathLocale);
85	strcat(filename, "/");
86	strcat(filename, name);
87	strcat(filename, "/");
88	strcat(filename, category_filename);
89	if ((fd = _open(filename, O_RDONLY)) < 0)
90		return (_LDP_ERROR);
91	if (_fstat(fd, &st) != 0)
92		goto bad_locale;
93	if (st.st_size <= 0) {
94		errno = EFTYPE;
95		goto bad_locale;
96	}
97	bufsize = namesize + st.st_size;
98	if ((lbuf = malloc(bufsize)) == NULL) {
99		errno = ENOMEM;
100		goto bad_locale;
101	}
102	(void)strcpy(lbuf, name);
103	p = lbuf + namesize;
104	plim = p + st.st_size;
105	if (_read(fd, p, (size_t) st.st_size) != st.st_size)
106		goto bad_lbuf;
107	/*
108	 * Parse the locale file into localebuf.
109	 */
110	if (plim[-1] != '\n') {
111		errno = EFTYPE;
112		goto bad_lbuf;
113	}
114	num_lines = split_lines(p, plim);
115	if (num_lines >= locale_buf_size_max)
116		num_lines = locale_buf_size_max;
117	else if (num_lines >= locale_buf_size_min)
118		num_lines = locale_buf_size_min;
119	else {
120		errno = EFTYPE;
121		goto bad_lbuf;
122	}
123	(void)_close(fd);
124	/*
125	 * Record the successful parse in the cache.
126	 */
127	if (*locale_buf != NULL)
128		free(*locale_buf);
129	*locale_buf = lbuf;
130	for (p = *locale_buf, i = 0; i < num_lines; i++)
131		dst_localebuf[i] = (p += strlen(p) + 1);
132	for (i = num_lines; i < locale_buf_size_max; i++)
133		dst_localebuf[i] = NULL;
134	*using_locale = 1;
135
136	return (_LDP_LOADED);
137
138bad_lbuf:
139	saverr = errno;
140	free(lbuf);
141	errno = saverr;
142bad_locale:
143	saverr = errno;
144	(void)_close(fd);
145	errno = saverr;
146
147	return (_LDP_ERROR);
148}
149
150static int
151split_lines(char *p, const char *plim)
152{
153	int i;
154
155	for (i = 0; p < plim; i++) {
156		p = strchr(p, '\n');
157		*p++ = '\0';
158	}
159	return (i);
160}
161
162