ldpart.c revision 88309 
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 * $FreeBSD: head/lib/libc/locale/ldpart.c 88309 2001-12-20 18:28:52Z phantom $
27 */
28
29#include "namespace.h"
30#include <sys/types.h>
31#include <sys/stat.h>
32#include <sys/syslimits.h>
33#include <fcntl.h>
34#include <stdlib.h>
35#include <string.h>
36#include <unistd.h>
37#include "un-namespace.h"
38
39#include "setlocale.h"
40#include "ldpart.h"
41
42static int split_lines(char *, const char *);
43static void set_from_buf(const char *, int, const char **);
44
45int
46__part_load_locale(const char *name,
47		int *using_locale,
48		char *locale_buf,
49		const char *category_filename,
50		int locale_buf_size_max,
51		int locale_buf_size_min,
52		const char **dst_localebuf) {
53
54	static char		locale_buf_C[] = "C";
55	static int		num_lines;
56
57	int			 fd;
58	char			*lbuf;
59	char			*p;
60	const char 		*plim;
61	char                     filename[PATH_MAX];
62	struct stat		 st;
63	size_t			 namesize;
64	size_t			 bufsize;
65	int                      save_using_locale;
66
67	save_using_locale = *using_locale;
68	*using_locale = 0;
69
70	if (name == NULL)
71		goto no_locale;
72
73	if (!strcmp(name, "C") || !strcmp(name, "POSIX"))
74		return 0;
75
76	/*
77	 * If the locale name is the same as our cache, use the cache.
78	 */
79	lbuf = locale_buf;
80	if (lbuf != NULL && strcmp(name, lbuf) == 0) {
81		set_from_buf(lbuf, num_lines, dst_localebuf);
82		*using_locale = 1;
83		return 0;
84	}
85
86	/*
87	 * Slurp the locale file into the cache.
88	 */
89	namesize = strlen(name) + 1;
90
91	if (!_PathLocale)
92		goto no_locale;
93	/* Range checking not needed, 'name' size is limited */
94	strcpy(filename, _PathLocale);
95	strcat(filename, "/");
96	strcat(filename, name);
97	strcat(filename, "/");
98	strcat(filename, category_filename);
99	fd = _open(filename, O_RDONLY);
100	if (fd < 0)
101		goto no_locale;
102	if (_fstat(fd, &st) != 0)
103		goto bad_locale;
104	if (st.st_size <= 0)
105		goto bad_locale;
106	bufsize = namesize + st.st_size;
107	locale_buf = NULL;
108	lbuf = (lbuf == NULL || lbuf == locale_buf_C) ?
109		malloc(bufsize) : reallocf(lbuf, bufsize);
110	if (lbuf == NULL)
111		goto bad_locale;
112	(void) strcpy(lbuf, name);
113	p = lbuf + namesize;
114	plim = p + st.st_size;
115	if (_read(fd, p, (size_t) st.st_size) != st.st_size)
116		goto bad_lbuf;
117	if (_close(fd) != 0)
118		goto bad_lbuf;
119	/*
120	 * Parse the locale file into localebuf.
121	 */
122	if (plim[-1] != '\n')
123		goto bad_lbuf;
124	num_lines = split_lines(p, plim);
125	if (num_lines >= locale_buf_size_max)
126		num_lines = locale_buf_size_max;
127	else if (num_lines >= locale_buf_size_min)
128		num_lines = locale_buf_size_min;
129	else
130		goto reset_locale;
131	set_from_buf(lbuf, num_lines, dst_localebuf);
132	/*
133	 * Record the successful parse in the cache.
134	 */
135	locale_buf = lbuf;
136
137	*using_locale = 1;
138	return 0;
139
140reset_locale:
141	locale_buf = locale_buf_C;
142	save_using_locale = 0;
143bad_lbuf:
144	free(lbuf);
145bad_locale:
146	(void)_close(fd);
147no_locale:
148	*using_locale = save_using_locale;
149	return -1;
150}
151
152static int
153split_lines(char *p, const char *plim) {
154
155	int i;
156
157	for (i = 0; p < plim; i++) {
158		p = strchr(p, '\n');
159		*p++ = '\0';
160	}
161	return i;
162}
163
164static void
165set_from_buf(const char *p, int num_lines, const char **dst_localebuf) {
166
167	const char **ap;
168	int i;
169
170	for (ap = dst_localebuf, i = 0; i < num_lines; ++ap, ++i)
171		*ap = p += strlen(p) + 1;
172}
173
174