xref: /freebsd/lib/libc/locale/ldpart.c (revision 42c159fe388a3765f69860c84183700af37aca8a)
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("$FreeBSD$");
29 
30 #include "namespace.h"
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <sys/syslimits.h>
34 #include <fcntl.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38 #include "un-namespace.h"
39 
40 #include "setlocale.h"
41 #include "ldpart.h"
42 
43 static int split_lines(char *, const char *);
44 static void set_from_buf(const char *, int, const char **);
45 
46 int
47 __part_load_locale(const char *name,
48 		int *using_locale,
49 		char *locale_buf,
50 		const char *category_filename,
51 		int locale_buf_size_max,
52 		int locale_buf_size_min,
53 		const char **dst_localebuf) {
54 
55 	static char		locale_buf_C[] = "C";
56 	static int		num_lines;
57 
58 	int			 fd;
59 	char			*lbuf;
60 	char			*p;
61 	const char 		*plim;
62 	char                     filename[PATH_MAX];
63 	struct stat		 st;
64 	size_t			 namesize;
65 	size_t			 bufsize;
66 	int                      save_using_locale;
67 
68 	save_using_locale = *using_locale;
69 	*using_locale = 0;
70 
71 	if (name == NULL)
72 		goto no_locale;
73 
74 	if (!strcmp(name, "C") || !strcmp(name, "POSIX"))
75 		return 0;
76 
77 	/*
78 	 * If the locale name is the same as our cache, use the cache.
79 	 */
80 	lbuf = locale_buf;
81 	if (lbuf != NULL && strcmp(name, lbuf) == 0) {
82 		set_from_buf(lbuf, num_lines, dst_localebuf);
83 		*using_locale = 1;
84 		return 0;
85 	}
86 
87 	/*
88 	 * Slurp the locale file into the cache.
89 	 */
90 	namesize = strlen(name) + 1;
91 
92 	if (!_PathLocale)
93 		goto no_locale;
94 	/* Range checking not needed, 'name' size is limited */
95 	strcpy(filename, _PathLocale);
96 	strcat(filename, "/");
97 	strcat(filename, name);
98 	strcat(filename, "/");
99 	strcat(filename, category_filename);
100 	fd = _open(filename, O_RDONLY);
101 	if (fd < 0)
102 		goto no_locale;
103 	if (_fstat(fd, &st) != 0)
104 		goto bad_locale;
105 	if (st.st_size <= 0)
106 		goto bad_locale;
107 	bufsize = namesize + st.st_size;
108 	locale_buf = NULL;
109 	lbuf = (lbuf == NULL || lbuf == locale_buf_C) ?
110 		malloc(bufsize) : reallocf(lbuf, bufsize);
111 	if (lbuf == NULL)
112 		goto bad_locale;
113 	(void) strcpy(lbuf, name);
114 	p = lbuf + namesize;
115 	plim = p + st.st_size;
116 	if (_read(fd, p, (size_t) st.st_size) != st.st_size)
117 		goto bad_lbuf;
118 	if (_close(fd) != 0)
119 		goto bad_lbuf;
120 	/*
121 	 * Parse the locale file into localebuf.
122 	 */
123 	if (plim[-1] != '\n')
124 		goto bad_lbuf;
125 	num_lines = split_lines(p, plim);
126 	if (num_lines >= locale_buf_size_max)
127 		num_lines = locale_buf_size_max;
128 	else if (num_lines >= locale_buf_size_min)
129 		num_lines = locale_buf_size_min;
130 	else
131 		goto reset_locale;
132 	set_from_buf(lbuf, num_lines, dst_localebuf);
133 	/*
134 	 * Record the successful parse in the cache.
135 	 */
136 	locale_buf = lbuf;
137 
138 	*using_locale = 1;
139 	return 0;
140 
141 reset_locale:
142 	locale_buf = locale_buf_C;
143 	save_using_locale = 0;
144 bad_lbuf:
145 	free(lbuf);
146 bad_locale:
147 	(void)_close(fd);
148 no_locale:
149 	*using_locale = save_using_locale;
150 	return -1;
151 }
152 
153 static int
154 split_lines(char *p, const char *plim) {
155 
156 	int i;
157 
158 	for (i = 0; p < plim; i++) {
159 		p = strchr(p, '\n');
160 		*p++ = '\0';
161 	}
162 	return i;
163 }
164 
165 static void
166 set_from_buf(const char *p, int num_lines, const char **dst_localebuf) {
167 
168 	const char **ap;
169 	int i;
170 
171 	for (ap = dst_localebuf, i = 0; i < num_lines; ++ap, ++i)
172 		*ap = p += strlen(p) + 1;
173 }
174 
175