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8a0746ae | 1 | /* Copyright (C) 2000,2001 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
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8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
3e076219 | 13 | |
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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. */ | |
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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 | ||
31 | #include "charmap-dir.h" | |
32 | ||
33 | extern void *xmalloc (size_t n); | |
34 | extern void *xrealloc (void *p, size_t n); | |
35 | ||
36 | /* The data type of a charmap directory being traversed. */ | |
37 | struct charmap_dir | |
38 | { | |
39 | DIR *dir; | |
40 | /* The directory pathname, ending in a slash. */ | |
41 | char *directory; | |
42 | size_t directory_len; | |
43 | /* Scratch area used for returning pathnames. */ | |
44 | char *pathname; | |
45 | size_t pathname_size; | |
46 | }; | |
47 | ||
48 | /* Starts a charmap directory traversal. | |
49 | Returns a CHARMAP_DIR, or NULL if the directory doesn't exist. */ | |
50 | CHARMAP_DIR * | |
51 | charmap_opendir (const char *directory) | |
52 | { | |
53 | struct charmap_dir *cdir; | |
54 | DIR *dir; | |
55 | size_t len; | |
56 | int add_slash; | |
57 | ||
58 | dir = opendir (directory); | |
59 | if (dir == NULL) | |
60 | { | |
61 | error (1, errno, gettext ("cannot read character map directory `%s'"), | |
62 | directory); | |
63 | return NULL; | |
64 | } | |
65 | ||
66 | cdir = (struct charmap_dir *) xmalloc (sizeof (struct charmap_dir)); | |
67 | cdir->dir = dir; | |
68 | ||
69 | len = strlen (directory); | |
70 | add_slash = (len == 0 || directory[len - 1] != '/'); | |
71 | cdir->directory = (char *) xmalloc (len + add_slash + 1); | |
72 | memcpy (cdir->directory, directory, len); | |
73 | if (add_slash) | |
74 | cdir->directory[len] = '/'; | |
75 | cdir->directory[len + add_slash] = '\0'; | |
76 | cdir->directory_len = len + add_slash; | |
77 | ||
78 | cdir->pathname = NULL; | |
79 | cdir->pathname_size = 0; | |
80 | ||
81 | return cdir; | |
82 | } | |
83 | ||
84 | /* Reads the next directory entry. | |
85 | Returns its charmap name, or NULL if past the last entry or upon error. | |
86 | The storage returned may be overwritten by a later charmap_readdir | |
87 | call on the same CHARMAP_DIR. */ | |
88 | const char * | |
89 | charmap_readdir (CHARMAP_DIR *cdir) | |
90 | { | |
91 | for (;;) | |
92 | { | |
93 | struct dirent *dirent; | |
94 | size_t len; | |
95 | size_t size; | |
96 | char *filename; | |
97 | mode_t mode; | |
98 | ||
99 | dirent = readdir (cdir->dir); | |
100 | if (dirent == NULL) | |
101 | return NULL; | |
102 | if (strcmp (dirent->d_name, ".") == 0) | |
103 | continue; | |
104 | if (strcmp (dirent->d_name, "..") == 0) | |
105 | continue; | |
106 | ||
107 | len = strlen (dirent->d_name); | |
108 | ||
109 | size = cdir->directory_len + len + 1; | |
110 | if (size > cdir->pathname_size) | |
111 | { | |
112 | free (cdir->pathname); | |
113 | if (size < 2 * cdir->pathname_size) | |
114 | size = 2 * cdir->pathname_size; | |
115 | cdir->pathname = (char *) xmalloc (size); | |
116 | cdir->pathname_size = size; | |
117 | } | |
118 | ||
119 | stpcpy (stpcpy (cdir->pathname, cdir->directory), dirent->d_name); | |
120 | filename = cdir->pathname + cdir->directory_len; | |
121 | ||
122 | #ifdef _DIRENT_HAVE_D_TYPE | |
123 | if (dirent->d_type != DT_UNKNOWN && dirent->d_type != DT_LNK) | |
124 | mode = DTTOIF (dirent->d_type); | |
125 | else | |
126 | #endif | |
127 | { | |
128 | struct stat statbuf; | |
129 | ||
130 | if (stat (cdir->pathname, &statbuf) < 0) | |
131 | continue; | |
132 | ||
133 | mode = statbuf.st_mode; | |
134 | } | |
135 | ||
136 | if (!S_ISREG (mode)) | |
137 | continue; | |
138 | ||
139 | /* For compressed charmaps, the canonical charmap name does not | |
140 | include the extension. */ | |
141 | if (len > 3 && memcmp (&filename[len - 3], ".gz", 3) == 0) | |
142 | filename[len - 3] = '\0'; | |
143 | else if (len > 4 && memcmp (&filename[len - 4], ".bz2", 4) == 0) | |
144 | filename[len - 4] = '\0'; | |
145 | ||
146 | return filename; | |
147 | } | |
148 | } | |
149 | ||
150 | /* Finishes a charmap directory traversal, and frees the resources | |
151 | attached to the CHARMAP_DIR. */ | |
152 | int | |
153 | charmap_closedir (CHARMAP_DIR *cdir) | |
154 | { | |
155 | DIR *dir = cdir->dir; | |
156 | ||
157 | free (cdir->directory); | |
158 | free (cdir->pathname); | |
159 | free (cdir); | |
160 | return closedir (dir); | |
161 | } | |
162 | ||
163 | /* Creates a subprocess decompressing the given pathname, and returns | |
164 | a stream reading its output (the decompressed data). */ | |
165 | static | |
166 | FILE * | |
8a0746ae | 167 | fopen_uncompressed (const char *pathname, const char *compressor) |
3e076219 UD |
168 | { |
169 | int pfd; | |
170 | ||
171 | pfd = open (pathname, O_RDONLY); | |
172 | if (pfd >= 0) | |
173 | { | |
174 | struct stat statbuf; | |
175 | int fd[2]; | |
176 | ||
177 | if (fstat (pfd, &statbuf) >= 0 | |
178 | && S_ISREG (statbuf.st_mode) | |
179 | && pipe (fd) >= 0) | |
180 | { | |
8a0746ae RM |
181 | char *argv[4] |
182 | = { (char *) compressor, (char *) "-d", (char *) "-c", NULL }; | |
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183 | posix_spawn_file_actions_t actions; |
184 | ||
185 | if (posix_spawn_file_actions_init (&actions) == 0) | |
186 | { | |
187 | if (posix_spawn_file_actions_adddup2 (&actions, | |
188 | fd[1], STDOUT_FILENO) == 0 | |
189 | && posix_spawn_file_actions_addclose (&actions, fd[1]) == 0 | |
190 | && posix_spawn_file_actions_addclose (&actions, fd[0]) == 0 | |
191 | && posix_spawn_file_actions_adddup2 (&actions, | |
192 | pfd, STDIN_FILENO) == 0 | |
193 | && posix_spawn_file_actions_addclose (&actions, pfd) == 0 | |
194 | && posix_spawnp (NULL, compressor, &actions, NULL, | |
195 | argv, environ) == 0) | |
196 | { | |
197 | posix_spawn_file_actions_destroy (&actions); | |
198 | close (fd[1]); | |
199 | close (pfd); | |
200 | return fdopen (fd[0], "r"); | |
201 | } | |
202 | posix_spawn_file_actions_destroy (&actions); | |
203 | } | |
204 | close (fd[1]); | |
205 | close (fd[0]); | |
206 | } | |
207 | close (pfd); | |
208 | } | |
209 | return NULL; | |
210 | } | |
211 | ||
212 | /* Opens a charmap for reading, given its name (not an alias name). */ | |
213 | FILE * | |
214 | charmap_open (const char *directory, const char *name) | |
215 | { | |
216 | size_t dlen = strlen (directory); | |
217 | int add_slash = (dlen == 0 || directory[dlen - 1] != '/'); | |
218 | size_t nlen = strlen (name); | |
219 | char *pathname; | |
220 | char *p; | |
221 | FILE *stream; | |
222 | ||
223 | pathname = alloca (dlen + add_slash + nlen + 5); | |
224 | p = stpcpy (pathname, directory); | |
225 | if (add_slash) | |
226 | *p++ = '/'; | |
227 | p = stpcpy (p, name); | |
228 | ||
229 | stream = fopen (pathname, "r"); | |
230 | if (stream != NULL) | |
231 | return stream; | |
232 | ||
233 | memcpy (p, ".gz", 4); | |
234 | stream = fopen_uncompressed (pathname, "gzip"); | |
235 | if (stream != NULL) | |
236 | return stream; | |
237 | ||
238 | memcpy (p, ".bz2", 5); | |
239 | stream = fopen_uncompressed (pathname, "bzip2"); | |
240 | if (stream != NULL) | |
241 | return stream; | |
242 | ||
243 | return NULL; | |
244 | } | |
245 | ||
246 | /* An empty alias list. Avoids the need to return NULL from | |
247 | charmap_aliases. */ | |
248 | static char *empty[1]; | |
249 | ||
250 | /* Returns a NULL terminated list of alias names of a charmap. */ | |
251 | char ** | |
252 | charmap_aliases (const char *directory, const char *name) | |
253 | { | |
254 | FILE *stream; | |
255 | char **aliases; | |
256 | size_t naliases; | |
257 | ||
258 | stream = charmap_open (directory, name); | |
259 | if (stream == NULL) | |
260 | return empty; | |
261 | ||
262 | aliases = NULL; | |
263 | naliases = 0; | |
264 | ||
265 | while (!feof (stream)) | |
266 | { | |
267 | char *alias = NULL; | |
268 | char junk[BUFSIZ]; | |
269 | ||
270 | if (fscanf (stream, " <code_set_name> %as", &alias) == 1 | |
271 | || fscanf (stream, "%% alias %as", &alias) == 1) | |
272 | { | |
273 | aliases = (char **) xrealloc (aliases, | |
274 | (naliases + 2) * sizeof (char *)); | |
275 | aliases[naliases++] = alias; | |
276 | } | |
277 | ||
278 | /* Read the rest of the line. */ | |
279 | if (fgets (junk, sizeof junk, stream) != NULL) | |
280 | { | |
281 | if (strstr (junk, "CHARMAP") != NULL) | |
282 | /* We cannot expect more aliases from now on. */ | |
283 | break; | |
284 | ||
285 | while (strchr (junk, '\n') == NULL | |
286 | && fgets (junk, sizeof junk, stream) != NULL) | |
287 | continue; | |
288 | } | |
289 | } | |
290 | ||
291 | fclose (stream); | |
292 | ||
293 | if (naliases == 0) | |
294 | return empty; | |
295 | ||
296 | aliases[naliases] = NULL; | |
297 | return aliases; | |
298 | } | |
299 | ||
300 | /* Frees an alias list returned by charmap_aliases. */ | |
301 | void | |
302 | charmap_free_aliases (char **aliases) | |
303 | { | |
304 | if (aliases != empty) | |
305 | { | |
306 | char **p; | |
307 | ||
308 | for (p = aliases; *p; p++) | |
309 | free (*p); | |
310 | ||
311 | free (aliases); | |
312 | } | |
313 | } |