ldpart.c revision 75367 
1/*
2 * Copyright (c) 2000, 2001 Alexey Zelkin
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 75367 2001-04-10 03:55:19Z deischen $
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#include "setlocale.h"
39#include "ldpart.h"
40
41static int split_lines(char *, const char *);
42static void set_from_buf(const char *, int, const char **);
43
44int
45__part_load_locale(const char *name,
46		int* using_locale,
47		char *locale_buf,
48		const char *category_name,
49		int locale_buf_size_max,
50		int locale_buf_size_min,
51		const char **dst_localebuf) {
52
53	static char		locale_buf_C[] = "C";
54	static int		num_lines;
55
56	int			fd;
57	char *			lbuf;
58	char *			p;
59	const char *		plim;
60	char                    filename[PATH_MAX];
61	struct stat		st;
62	size_t			namesize;
63	size_t			bufsize;
64	int                     save_using_locale;
65
66	save_using_locale = *using_locale;
67	*using_locale = 0;
68
69	if (name == NULL)
70		goto no_locale;
71
72	if (!strcmp(name, "C") || !strcmp(name, "POSIX"))
73		return 0;
74
75	/*
76	** If the locale name is the same as our cache, use the cache.
77	*/
78	lbuf = locale_buf;
79	if (lbuf != NULL && strcmp(name, lbuf) == 0) {
80		set_from_buf(lbuf, num_lines, dst_localebuf);
81		*using_locale = 1;
82		return 0;
83	}
84	/*
85	** Slurp the locale file into the cache.
86	*/
87	namesize = strlen(name) + 1;
88
89	if (!_PathLocale)
90		goto no_locale;
91	/* Range checking not needed, 'name' size is limited */
92	strcpy(filename, _PathLocale);
93	strcat(filename, "/");
94	strcat(filename, name);
95	strcat(filename, "/");
96	strcat(filename, category_name);
97	fd = _open(filename, O_RDONLY);
98	if (fd < 0)
99		goto no_locale;
100	if (_fstat(fd, &st) != 0)
101		goto bad_locale;
102	if (st.st_size <= 0)
103		goto bad_locale;
104	bufsize = namesize + st.st_size;
105	locale_buf = NULL;
106	lbuf = (lbuf == NULL || lbuf == locale_buf_C) ?
107		malloc(bufsize) : reallocf(lbuf, bufsize);
108	if (lbuf == NULL)
109		goto bad_locale;
110	(void) strcpy(lbuf, name);
111	p = lbuf + namesize;
112	plim = p + st.st_size;
113	if (_read(fd, p, (size_t) st.st_size) != st.st_size)
114		goto bad_lbuf;
115	if (_close(fd) != 0)
116		goto bad_lbuf;
117	/*
118	** Parse the locale file into localebuf.
119	*/
120	if (plim[-1] != '\n')
121		goto bad_lbuf;
122	num_lines = split_lines(p, plim);
123	if (num_lines >= locale_buf_size_max)
124		num_lines = locale_buf_size_max;
125	else if (num_lines >= locale_buf_size_min)
126		num_lines = locale_buf_size_min;
127	else
128		goto reset_locale;
129	set_from_buf(lbuf, num_lines, dst_localebuf);
130	/*
131	** Record the successful parse in the cache.
132	*/
133	locale_buf = lbuf;
134
135	*using_locale = 1;
136	return 0;
137
138reset_locale:
139	locale_buf = locale_buf_C;
140	save_using_locale = 0;
141bad_lbuf:
142	free(lbuf);
143bad_locale:
144	(void)_close(fd);
145no_locale:
146	*using_locale = save_using_locale;
147	return -1;
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
162static void
163set_from_buf(const char *p, int num_lines, const char **dst_localebuf)
164{
165	const char **ap;
166	int i;
167
168	for (ap = dst_localebuf, i = 0; i < num_lines; ++ap, ++i)
169		*ap = p += strlen(p) + 1;
170}
171
172