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a334319f | 1 | /* Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc. |
3e076219 UD |
2 | This file is part of the GNU C Library. |
3 | ||
a334319f UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
3e076219 | 8 | |
a334319f | 9 | The GNU C Library is distributed in the hope that it will be useful, |
3e076219 | 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
a334319f UD |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. | |
3e076219 | 13 | |
a334319f UD |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
3e076219 UD |
18 | |
19 | #include <dirent.h> | |
20 | #include <errno.h> | |
21 | #include <error.h> | |
22 | #include <fcntl.h> | |
23 | #include <libintl.h> | |
24 | #include <spawn.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <unistd.h> | |
29 | #include <sys/stat.h> | |
30 | ||
f2b98f97 | 31 | #include "localedef.h" |
3e076219 UD |
32 | #include "charmap-dir.h" |
33 | ||
3e076219 UD |
34 | /* The data type of a charmap directory being traversed. */ |
35 | struct charmap_dir | |
36 | { | |
37 | DIR *dir; | |
38 | /* The directory pathname, ending in a slash. */ | |
39 | char *directory; | |
40 | size_t directory_len; | |
41 | /* Scratch area used for returning pathnames. */ | |
42 | char *pathname; | |
43 | size_t pathname_size; | |
44 | }; | |
45 | ||
46 | /* Starts a charmap directory traversal. | |
47 | Returns a CHARMAP_DIR, or NULL if the directory doesn't exist. */ | |
48 | CHARMAP_DIR * | |
49 | charmap_opendir (const char *directory) | |
50 | { | |
51 | struct charmap_dir *cdir; | |
52 | DIR *dir; | |
53 | size_t len; | |
54 | int add_slash; | |
55 | ||
56 | dir = opendir (directory); | |
57 | if (dir == NULL) | |
58 | { | |
f2b98f97 UD |
59 | WITH_CUR_LOCALE (error (1, errno, gettext ("\ |
60 | cannot read character map directory `%s'"), directory)); | |
3e076219 UD |
61 | return NULL; |
62 | } | |
63 | ||
64 | cdir = (struct charmap_dir *) xmalloc (sizeof (struct charmap_dir)); | |
65 | cdir->dir = dir; | |
66 | ||
67 | len = strlen (directory); | |
68 | add_slash = (len == 0 || directory[len - 1] != '/'); | |
69 | cdir->directory = (char *) xmalloc (len + add_slash + 1); | |
70 | memcpy (cdir->directory, directory, len); | |
71 | if (add_slash) | |
72 | cdir->directory[len] = '/'; | |
73 | cdir->directory[len + add_slash] = '\0'; | |
74 | cdir->directory_len = len + add_slash; | |
75 | ||
76 | cdir->pathname = NULL; | |
77 | cdir->pathname_size = 0; | |
78 | ||
79 | return cdir; | |
80 | } | |
81 | ||
82 | /* Reads the next directory entry. | |
83 | Returns its charmap name, or NULL if past the last entry or upon error. | |
84 | The storage returned may be overwritten by a later charmap_readdir | |
85 | call on the same CHARMAP_DIR. */ | |
86 | const char * | |
87 | charmap_readdir (CHARMAP_DIR *cdir) | |
88 | { | |
89 | for (;;) | |
90 | { | |
9ef0a840 | 91 | struct dirent64 *dirent; |
3e076219 UD |
92 | size_t len; |
93 | size_t size; | |
94 | char *filename; | |
95 | mode_t mode; | |
96 | ||
9ef0a840 | 97 | dirent = readdir64 (cdir->dir); |
3e076219 UD |
98 | if (dirent == NULL) |
99 | return NULL; | |
100 | if (strcmp (dirent->d_name, ".") == 0) | |
101 | continue; | |
102 | if (strcmp (dirent->d_name, "..") == 0) | |
103 | continue; | |
104 | ||
105 | len = strlen (dirent->d_name); | |
106 | ||
107 | size = cdir->directory_len + len + 1; | |
108 | if (size > cdir->pathname_size) | |
109 | { | |
110 | free (cdir->pathname); | |
111 | if (size < 2 * cdir->pathname_size) | |
112 | size = 2 * cdir->pathname_size; | |
113 | cdir->pathname = (char *) xmalloc (size); | |
114 | cdir->pathname_size = size; | |
115 | } | |
116 | ||
117 | stpcpy (stpcpy (cdir->pathname, cdir->directory), dirent->d_name); | |
118 | filename = cdir->pathname + cdir->directory_len; | |
119 | ||
120 | #ifdef _DIRENT_HAVE_D_TYPE | |
121 | if (dirent->d_type != DT_UNKNOWN && dirent->d_type != DT_LNK) | |
122 | mode = DTTOIF (dirent->d_type); | |
123 | else | |
124 | #endif | |
125 | { | |
126 | struct stat statbuf; | |
127 | ||
128 | if (stat (cdir->pathname, &statbuf) < 0) | |
129 | continue; | |
130 | ||
131 | mode = statbuf.st_mode; | |
132 | } | |
133 | ||
134 | if (!S_ISREG (mode)) | |
135 | continue; | |
136 | ||
137 | /* For compressed charmaps, the canonical charmap name does not | |
138 | include the extension. */ | |
139 | if (len > 3 && memcmp (&filename[len - 3], ".gz", 3) == 0) | |
140 | filename[len - 3] = '\0'; | |
141 | else if (len > 4 && memcmp (&filename[len - 4], ".bz2", 4) == 0) | |
142 | filename[len - 4] = '\0'; | |
143 | ||
144 | return filename; | |
145 | } | |
146 | } | |
147 | ||
148 | /* Finishes a charmap directory traversal, and frees the resources | |
149 | attached to the CHARMAP_DIR. */ | |
150 | int | |
151 | charmap_closedir (CHARMAP_DIR *cdir) | |
152 | { | |
153 | DIR *dir = cdir->dir; | |
154 | ||
155 | free (cdir->directory); | |
156 | free (cdir->pathname); | |
157 | free (cdir); | |
158 | return closedir (dir); | |
159 | } | |
160 | ||
161 | /* Creates a subprocess decompressing the given pathname, and returns | |
162 | a stream reading its output (the decompressed data). */ | |
163 | static | |
164 | FILE * | |
8a0746ae | 165 | fopen_uncompressed (const char *pathname, const char *compressor) |
3e076219 UD |
166 | { |
167 | int pfd; | |
168 | ||
169 | pfd = open (pathname, O_RDONLY); | |
170 | if (pfd >= 0) | |
171 | { | |
172 | struct stat statbuf; | |
173 | int fd[2]; | |
174 | ||
175 | if (fstat (pfd, &statbuf) >= 0 | |
176 | && S_ISREG (statbuf.st_mode) | |
177 | && pipe (fd) >= 0) | |
178 | { | |
8a0746ae RM |
179 | char *argv[4] |
180 | = { (char *) compressor, (char *) "-d", (char *) "-c", NULL }; | |
3e076219 UD |
181 | posix_spawn_file_actions_t actions; |
182 | ||
183 | if (posix_spawn_file_actions_init (&actions) == 0) | |
184 | { | |
185 | if (posix_spawn_file_actions_adddup2 (&actions, | |
186 | fd[1], STDOUT_FILENO) == 0 | |
187 | && posix_spawn_file_actions_addclose (&actions, fd[1]) == 0 | |
188 | && posix_spawn_file_actions_addclose (&actions, fd[0]) == 0 | |
189 | && posix_spawn_file_actions_adddup2 (&actions, | |
190 | pfd, STDIN_FILENO) == 0 | |
191 | && posix_spawn_file_actions_addclose (&actions, pfd) == 0 | |
192 | && posix_spawnp (NULL, compressor, &actions, NULL, | |
193 | argv, environ) == 0) | |
194 | { | |
195 | posix_spawn_file_actions_destroy (&actions); | |
196 | close (fd[1]); | |
197 | close (pfd); | |
198 | return fdopen (fd[0], "r"); | |
199 | } | |
200 | posix_spawn_file_actions_destroy (&actions); | |
201 | } | |
202 | close (fd[1]); | |
203 | close (fd[0]); | |
204 | } | |
205 | close (pfd); | |
206 | } | |
207 | return NULL; | |
208 | } | |
209 | ||
210 | /* Opens a charmap for reading, given its name (not an alias name). */ | |
211 | FILE * | |
212 | charmap_open (const char *directory, const char *name) | |
213 | { | |
214 | size_t dlen = strlen (directory); | |
215 | int add_slash = (dlen == 0 || directory[dlen - 1] != '/'); | |
216 | size_t nlen = strlen (name); | |
217 | char *pathname; | |
218 | char *p; | |
219 | FILE *stream; | |
220 | ||
221 | pathname = alloca (dlen + add_slash + nlen + 5); | |
222 | p = stpcpy (pathname, directory); | |
223 | if (add_slash) | |
224 | *p++ = '/'; | |
225 | p = stpcpy (p, name); | |
226 | ||
2e2dc1a5 | 227 | stream = fopen (pathname, "rm"); |
3e076219 UD |
228 | if (stream != NULL) |
229 | return stream; | |
230 | ||
231 | memcpy (p, ".gz", 4); | |
232 | stream = fopen_uncompressed (pathname, "gzip"); | |
233 | if (stream != NULL) | |
234 | return stream; | |
235 | ||
236 | memcpy (p, ".bz2", 5); | |
237 | stream = fopen_uncompressed (pathname, "bzip2"); | |
238 | if (stream != NULL) | |
239 | return stream; | |
240 | ||
241 | return NULL; | |
242 | } | |
243 | ||
244 | /* An empty alias list. Avoids the need to return NULL from | |
245 | charmap_aliases. */ | |
246 | static char *empty[1]; | |
247 | ||
248 | /* Returns a NULL terminated list of alias names of a charmap. */ | |
249 | char ** | |
250 | charmap_aliases (const char *directory, const char *name) | |
251 | { | |
252 | FILE *stream; | |
253 | char **aliases; | |
254 | size_t naliases; | |
255 | ||
256 | stream = charmap_open (directory, name); | |
257 | if (stream == NULL) | |
258 | return empty; | |
259 | ||
260 | aliases = NULL; | |
261 | naliases = 0; | |
262 | ||
263 | while (!feof (stream)) | |
264 | { | |
265 | char *alias = NULL; | |
266 | char junk[BUFSIZ]; | |
267 | ||
268 | if (fscanf (stream, " <code_set_name> %as", &alias) == 1 | |
269 | || fscanf (stream, "%% alias %as", &alias) == 1) | |
270 | { | |
271 | aliases = (char **) xrealloc (aliases, | |
272 | (naliases + 2) * sizeof (char *)); | |
273 | aliases[naliases++] = alias; | |
274 | } | |
275 | ||
276 | /* Read the rest of the line. */ | |
277 | if (fgets (junk, sizeof junk, stream) != NULL) | |
278 | { | |
279 | if (strstr (junk, "CHARMAP") != NULL) | |
280 | /* We cannot expect more aliases from now on. */ | |
281 | break; | |
282 | ||
283 | while (strchr (junk, '\n') == NULL | |
284 | && fgets (junk, sizeof junk, stream) != NULL) | |
285 | continue; | |
286 | } | |
287 | } | |
288 | ||
289 | fclose (stream); | |
290 | ||
291 | if (naliases == 0) | |
292 | return empty; | |
293 | ||
294 | aliases[naliases] = NULL; | |
295 | return aliases; | |
296 | } | |
297 | ||
298 | /* Frees an alias list returned by charmap_aliases. */ | |
299 | void | |
300 | charmap_free_aliases (char **aliases) | |
301 | { | |
302 | if (aliases != empty) | |
303 | { | |
304 | char **p; | |
305 | ||
306 | for (p = aliases; *p; p++) | |
307 | free (*p); | |
308 | ||
309 | free (aliases); | |
310 | } | |
311 | } |