ldpart.c revision 73253 
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 73253 2001-03-01 04:59:01Z 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 "un-namespace.h"
35#include <stdlib.h>
36#include <string.h>
37#include "setlocale.h"
38#include "ldpart.h"
39
40static int split_lines(char *, const char *);
41static void set_from_buf(const char *, int, const char **);
42
43int
44__part_load_locale(const char *name,
45		int* using_locale,
46		char *locale_buf,
47		const char *category_name,
48		int locale_buf_size_max,
49		int locale_buf_size_min,
50		const char **dst_localebuf) {
51
52	static char		locale_buf_C[] = "C";
53	static int		num_lines;
54
55	int			fd;
56	char *			lbuf;
57	char *			p;
58	const char *		plim;
59	char                    filename[PATH_MAX];
60	struct stat		st;
61	size_t			namesize;
62	size_t			bufsize;
63	int                     save_using_locale;
64
65	save_using_locale = *using_locale;
66	*using_locale = 0;
67
68	if (name == NULL)
69		goto no_locale;
70
71	if (!strcmp(name, "C") || !strcmp(name, "POSIX"))
72		return 0;
73
74	/*
75	** If the locale name is the same as our cache, use the cache.
76	*/
77	lbuf = locale_buf;
78	if (lbuf != NULL && strcmp(name, lbuf) == 0) {
79		set_from_buf(lbuf, num_lines, dst_localebuf);
80		*using_locale = 1;
81		return 0;
82	}
83	/*
84	** Slurp the locale file into the cache.
85	*/
86	namesize = strlen(name) + 1;
87
88	if (!_PathLocale)
89		goto no_locale;
90	/* Range checking not needed, 'name' size is limited */
91	strcpy(filename, _PathLocale);
92	strcat(filename, "/");
93	strcat(filename, name);
94	strcat(filename, "/");
95	strcat(filename, category_name);
96	fd = _open(filename, O_RDONLY);
97	if (fd < 0)
98		goto no_locale;
99	if (_fstat(fd, &st) != 0)
100		goto bad_locale;
101	if (st.st_size <= 0)
102		goto bad_locale;
103	bufsize = namesize + st.st_size;
104	locale_buf = NULL;
105	lbuf = (lbuf == NULL || lbuf == locale_buf_C) ?
106		malloc(bufsize) : reallocf(lbuf, bufsize);
107	if (lbuf == NULL)
108		goto bad_locale;
109	(void) strcpy(lbuf, name);
110	p = lbuf + namesize;
111	plim = p + st.st_size;
112	if (_read(fd, p, (size_t) st.st_size) != st.st_size)
113		goto bad_lbuf;
114	if (_close(fd) != 0)
115		goto bad_lbuf;
116	/*
117	** Parse the locale file into localebuf.
118	*/
119	if (plim[-1] != '\n')
120		goto bad_lbuf;
121	num_lines = split_lines(p, plim);
122	if (num_lines >= locale_buf_size_max)
123		num_lines = locale_buf_size_max;
124	else if (num_lines >= locale_buf_size_min)
125		num_lines = locale_buf_size_min;
126	else
127		goto reset_locale;
128	set_from_buf(lbuf, num_lines, dst_localebuf);
129	/*
130	** Record the successful parse in the cache.
131	*/
132	locale_buf = lbuf;
133
134	*using_locale = 1;
135	return 0;
136
137reset_locale:
138	locale_buf = locale_buf_C;
139	save_using_locale = 0;
140bad_lbuf:
141	free(lbuf);
142bad_locale:
143	(void)_close(fd);
144no_locale:
145	*using_locale = save_using_locale;
146	return -1;
147}
148
149static int
150split_lines(char *p, const char *plim)
151{
152	int i;
153
154	for (i = 0; p < plim; i++) {
155		p = strchr(p, '\n');
156		*p++ = '\0';
157	}
158	return i;
159}
160
161static void
162set_from_buf(const char *p, int num_lines, const char **dst_localebuf)
163{
164	const char **ap;
165	int i;
166
167	for (ap = dst_localebuf, i = 0; i < num_lines; ++ap, ++i)
168		*ap = p += strlen(p) + 1;
169}
170
171