1 /* Copyright (C) 2000, 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License version 2 as
6 published by the Free Software Foundation.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software Foundation,
15 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
29 #include "localedef.h"
30 #include "charmap-dir.h"
32 /* The data type of a charmap directory being traversed. */
36 /* The directory pathname, ending in a slash. */
39 /* Scratch area used for returning pathnames. */
44 /* Starts a charmap directory traversal.
45 Returns a CHARMAP_DIR, or NULL if the directory doesn't exist. */
47 charmap_opendir (const char *directory)
49 struct charmap_dir *cdir;
54 dir = opendir (directory);
57 WITH_CUR_LOCALE (error (1, errno, gettext ("\
58 cannot read character map directory `%s'"), directory));
62 cdir = (struct charmap_dir *) xmalloc (sizeof (struct charmap_dir));
65 len = strlen (directory);
66 add_slash = (len == 0 || directory[len - 1] != '/');
67 cdir->directory = (char *) xmalloc (len + add_slash + 1);
68 memcpy (cdir->directory, directory, len);
70 cdir->directory[len] = '/';
71 cdir->directory[len + add_slash] = '\0';
72 cdir->directory_len = len + add_slash;
74 cdir->pathname = NULL;
75 cdir->pathname_size = 0;
80 /* Reads the next directory entry.
81 Returns its charmap name, or NULL if past the last entry or upon error.
82 The storage returned may be overwritten by a later charmap_readdir
83 call on the same CHARMAP_DIR. */
85 charmap_readdir (CHARMAP_DIR *cdir)
89 struct dirent64 *dirent;
95 dirent = readdir64 (cdir->dir);
98 if (strcmp (dirent->d_name, ".") == 0)
100 if (strcmp (dirent->d_name, "..") == 0)
103 len = strlen (dirent->d_name);
105 size = cdir->directory_len + len + 1;
106 if (size > cdir->pathname_size)
108 free (cdir->pathname);
109 if (size < 2 * cdir->pathname_size)
110 size = 2 * cdir->pathname_size;
111 cdir->pathname = (char *) xmalloc (size);
112 cdir->pathname_size = size;
115 stpcpy (stpcpy (cdir->pathname, cdir->directory), dirent->d_name);
116 filename = cdir->pathname + cdir->directory_len;
118 #ifdef _DIRENT_HAVE_D_TYPE
119 if (dirent->d_type != DT_UNKNOWN && dirent->d_type != DT_LNK)
120 mode = DTTOIF (dirent->d_type);
126 if (stat (cdir->pathname, &statbuf) < 0)
129 mode = statbuf.st_mode;
135 /* For compressed charmaps, the canonical charmap name does not
136 include the extension. */
137 if (len > 3 && memcmp (&filename[len - 3], ".gz", 3) == 0)
138 filename[len - 3] = '\0';
139 else if (len > 4 && memcmp (&filename[len - 4], ".bz2", 4) == 0)
140 filename[len - 4] = '\0';
146 /* Finishes a charmap directory traversal, and frees the resources
147 attached to the CHARMAP_DIR. */
149 charmap_closedir (CHARMAP_DIR *cdir)
151 DIR *dir = cdir->dir;
153 free (cdir->directory);
154 free (cdir->pathname);
156 return closedir (dir);
159 /* Creates a subprocess decompressing the given pathname, and returns
160 a stream reading its output (the decompressed data). */
163 fopen_uncompressed (const char *pathname, const char *compressor)
167 pfd = open (pathname, O_RDONLY);
173 if (fstat (pfd, &statbuf) >= 0
174 && S_ISREG (statbuf.st_mode)
178 = { (char *) compressor, (char *) "-d", (char *) "-c", NULL };
179 posix_spawn_file_actions_t actions;
181 if (posix_spawn_file_actions_init (&actions) == 0)
183 if (posix_spawn_file_actions_adddup2 (&actions,
184 fd[1], STDOUT_FILENO) == 0
185 && posix_spawn_file_actions_addclose (&actions, fd[1]) == 0
186 && posix_spawn_file_actions_addclose (&actions, fd[0]) == 0
187 && posix_spawn_file_actions_adddup2 (&actions,
188 pfd, STDIN_FILENO) == 0
189 && posix_spawn_file_actions_addclose (&actions, pfd) == 0
190 && posix_spawnp (NULL, compressor, &actions, NULL,
193 posix_spawn_file_actions_destroy (&actions);
196 return fdopen (fd[0], "r");
198 posix_spawn_file_actions_destroy (&actions);
208 /* Opens a charmap for reading, given its name (not an alias name). */
210 charmap_open (const char *directory, const char *name)
212 size_t dlen = strlen (directory);
213 int add_slash = (dlen == 0 || directory[dlen - 1] != '/');
214 size_t nlen = strlen (name);
219 pathname = alloca (dlen + add_slash + nlen + 5);
220 p = stpcpy (pathname, directory);
223 p = stpcpy (p, name);
225 stream = fopen (pathname, "rm");
229 memcpy (p, ".gz", 4);
230 stream = fopen_uncompressed (pathname, "gzip");
234 memcpy (p, ".bz2", 5);
235 stream = fopen_uncompressed (pathname, "bzip2");
242 /* An empty alias list. Avoids the need to return NULL from
244 static char *empty[1];
246 /* Returns a NULL terminated list of alias names of a charmap. */
248 charmap_aliases (const char *directory, const char *name)
254 stream = charmap_open (directory, name);
261 while (!feof (stream))
266 if (fscanf (stream, " <code_set_name> %as", &alias) == 1
267 || fscanf (stream, "%% alias %as", &alias) == 1)
269 aliases = (char **) xrealloc (aliases,
270 (naliases + 2) * sizeof (char *));
271 aliases[naliases++] = alias;
274 /* Read the rest of the line. */
275 if (fgets (junk, sizeof junk, stream) != NULL)
277 if (strstr (junk, "CHARMAP") != NULL)
278 /* We cannot expect more aliases from now on. */
281 while (strchr (junk, '\n') == NULL
282 && fgets (junk, sizeof junk, stream) != NULL)
292 aliases[naliases] = NULL;
296 /* Frees an alias list returned by charmap_aliases. */
298 charmap_free_aliases (char **aliases)
300 if (aliases != empty)
304 for (p = aliases; *p; p++)