ldpart.c revision 87658 
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 87658 2001-12-11 15:55:42Z 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_name,
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	 * Slurp the locale file into the cache.
87	 */
88	namesize = strlen(name) + 1;
89
90	if (!_PathLocale)
91		goto no_locale;
92	/* Range checking not needed, 'name' size is limited */
93	strcpy(filename, _PathLocale);
94	strcat(filename, "/");
95	strcat(filename, name);
96	strcat(filename, "/");
97	strcat(filename, category_name);
98	fd = _open(filename, O_RDONLY);
99	if (fd < 0)
100		goto no_locale;
101	if (_fstat(fd, &st) != 0)
102		goto bad_locale;
103	if (st.st_size <= 0)
104		goto bad_locale;
105	bufsize = namesize + st.st_size;
106	locale_buf = NULL;
107	lbuf = (lbuf == NULL || lbuf == locale_buf_C) ?
108		malloc(bufsize) : reallocf(lbuf, bufsize);
109	if (lbuf == NULL)
110		goto bad_locale;
111	(void) strcpy(lbuf, name);
112	p = lbuf + namesize;
113	plim = p + st.st_size;
114	if (_read(fd, p, (size_t) st.st_size) != st.st_size)
115		goto bad_lbuf;
116	if (_close(fd) != 0)
117		goto bad_lbuf;
118	/*
119	 * Parse the locale file into localebuf.
120	 */
121	if (plim[-1] != '\n')
122		goto bad_lbuf;
123	num_lines = split_lines(p, plim);
124	if (num_lines >= locale_buf_size_max)
125		num_lines = locale_buf_size_max;
126	else if (num_lines >= locale_buf_size_min)
127		num_lines = locale_buf_size_min;
128	else
129		goto reset_locale;
130	set_from_buf(lbuf, num_lines, dst_localebuf);
131	/*
132	** Record the successful parse in the cache.
133	*/
134	locale_buf = lbuf;
135
136	*using_locale = 1;
137	return 0;
138
139reset_locale:
140	locale_buf = locale_buf_C;
141	save_using_locale = 0;
142bad_lbuf:
143	free(lbuf);
144bad_locale:
145	(void)_close(fd);
146no_locale:
147	*using_locale = save_using_locale;
148	return -1;
149}
150
151static int
152split_lines(char *p, const char *plim)
153{
154	int i;
155
156	for (i = 0; p < plim; i++) {
157		p = strchr(p, '\n');
158		*p++ = '\0';
159	}
160	return i;
161}
162
163static void
164set_from_buf(const char *p, int num_lines, const char **dst_localebuf)
165{
166	const char **ap;
167	int i;
168
169	for (ap = dst_localebuf, i = 0; i < num_lines; ++ap, ++i)
170		*ap = p += strlen(p) + 1;
171}
172
173