1 /* Copyright (C) 2000-2016 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 as published
6 by the Free Software Foundation; version 2 of the License, or
7 (at your option) any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, see <http://www.gnu.org/licenses/>. */
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
);
124 struct stat64 statbuf
;
126 if (stat64 (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
);
170 struct stat64 statbuf
;
173 if (fstat64 (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> %ms", &alias
) == 1
267 || fscanf (stream
, "%% alias %ms", &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
++)