310 lines
8.1 KiB
C
310 lines
8.1 KiB
C
/* Copyright (C) 2000, 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <dirent.h>
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <libintl.h>
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#include <spawn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "localedef.h"
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#include "charmap-dir.h"
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/* The data type of a charmap directory being traversed. */
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struct charmap_dir
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{
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DIR *dir;
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/* The directory pathname, ending in a slash. */
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char *directory;
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size_t directory_len;
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/* Scratch area used for returning pathnames. */
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char *pathname;
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size_t pathname_size;
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};
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/* Starts a charmap directory traversal.
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Returns a CHARMAP_DIR, or NULL if the directory doesn't exist. */
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CHARMAP_DIR *
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charmap_opendir (const char *directory)
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{
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struct charmap_dir *cdir;
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DIR *dir;
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size_t len;
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int add_slash;
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dir = opendir (directory);
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if (dir == NULL)
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{
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WITH_CUR_LOCALE (error (1, errno, gettext ("\
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cannot read character map directory `%s'"), directory));
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return NULL;
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}
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cdir = (struct charmap_dir *) xmalloc (sizeof (struct charmap_dir));
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cdir->dir = dir;
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len = strlen (directory);
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add_slash = (len == 0 || directory[len - 1] != '/');
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cdir->directory = (char *) xmalloc (len + add_slash + 1);
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memcpy (cdir->directory, directory, len);
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if (add_slash)
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cdir->directory[len] = '/';
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cdir->directory[len + add_slash] = '\0';
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cdir->directory_len = len + add_slash;
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cdir->pathname = NULL;
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cdir->pathname_size = 0;
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return cdir;
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}
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/* Reads the next directory entry.
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Returns its charmap name, or NULL if past the last entry or upon error.
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The storage returned may be overwritten by a later charmap_readdir
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call on the same CHARMAP_DIR. */
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const char *
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charmap_readdir (CHARMAP_DIR *cdir)
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{
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for (;;)
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{
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struct dirent64 *dirent;
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size_t len;
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size_t size;
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char *filename;
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mode_t mode;
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dirent = readdir64 (cdir->dir);
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if (dirent == NULL)
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return NULL;
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if (strcmp (dirent->d_name, ".") == 0)
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continue;
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if (strcmp (dirent->d_name, "..") == 0)
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continue;
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len = strlen (dirent->d_name);
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size = cdir->directory_len + len + 1;
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if (size > cdir->pathname_size)
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{
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free (cdir->pathname);
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if (size < 2 * cdir->pathname_size)
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size = 2 * cdir->pathname_size;
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cdir->pathname = (char *) xmalloc (size);
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cdir->pathname_size = size;
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}
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stpcpy (stpcpy (cdir->pathname, cdir->directory), dirent->d_name);
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filename = cdir->pathname + cdir->directory_len;
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#ifdef _DIRENT_HAVE_D_TYPE
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if (dirent->d_type != DT_UNKNOWN && dirent->d_type != DT_LNK)
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mode = DTTOIF (dirent->d_type);
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else
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#endif
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{
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struct stat statbuf;
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if (stat (cdir->pathname, &statbuf) < 0)
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continue;
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mode = statbuf.st_mode;
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}
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if (!S_ISREG (mode))
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continue;
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/* For compressed charmaps, the canonical charmap name does not
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include the extension. */
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if (len > 3 && memcmp (&filename[len - 3], ".gz", 3) == 0)
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filename[len - 3] = '\0';
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else if (len > 4 && memcmp (&filename[len - 4], ".bz2", 4) == 0)
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filename[len - 4] = '\0';
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return filename;
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}
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}
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/* Finishes a charmap directory traversal, and frees the resources
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attached to the CHARMAP_DIR. */
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int
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charmap_closedir (CHARMAP_DIR *cdir)
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{
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DIR *dir = cdir->dir;
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free (cdir->directory);
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free (cdir->pathname);
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free (cdir);
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return closedir (dir);
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}
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/* Creates a subprocess decompressing the given pathname, and returns
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a stream reading its output (the decompressed data). */
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static
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FILE *
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fopen_uncompressed (const char *pathname, const char *compressor)
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{
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int pfd;
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pfd = open (pathname, O_RDONLY);
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if (pfd >= 0)
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{
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struct stat statbuf;
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int fd[2];
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if (fstat (pfd, &statbuf) >= 0
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&& S_ISREG (statbuf.st_mode)
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&& pipe (fd) >= 0)
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{
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char *argv[4]
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= { (char *) compressor, (char *) "-d", (char *) "-c", NULL };
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posix_spawn_file_actions_t actions;
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if (posix_spawn_file_actions_init (&actions) == 0)
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{
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if (posix_spawn_file_actions_adddup2 (&actions,
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fd[1], STDOUT_FILENO) == 0
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&& posix_spawn_file_actions_addclose (&actions, fd[1]) == 0
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&& posix_spawn_file_actions_addclose (&actions, fd[0]) == 0
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&& posix_spawn_file_actions_adddup2 (&actions,
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pfd, STDIN_FILENO) == 0
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&& posix_spawn_file_actions_addclose (&actions, pfd) == 0
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&& posix_spawnp (NULL, compressor, &actions, NULL,
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argv, environ) == 0)
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{
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posix_spawn_file_actions_destroy (&actions);
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close (fd[1]);
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close (pfd);
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return fdopen (fd[0], "r");
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}
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posix_spawn_file_actions_destroy (&actions);
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}
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close (fd[1]);
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close (fd[0]);
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}
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close (pfd);
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}
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return NULL;
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}
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/* Opens a charmap for reading, given its name (not an alias name). */
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FILE *
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charmap_open (const char *directory, const char *name)
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{
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size_t dlen = strlen (directory);
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int add_slash = (dlen == 0 || directory[dlen - 1] != '/');
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size_t nlen = strlen (name);
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char *pathname;
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char *p;
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FILE *stream;
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pathname = alloca (dlen + add_slash + nlen + 5);
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p = stpcpy (pathname, directory);
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if (add_slash)
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*p++ = '/';
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p = stpcpy (p, name);
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stream = fopen (pathname, "rm");
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if (stream != NULL)
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return stream;
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memcpy (p, ".gz", 4);
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stream = fopen_uncompressed (pathname, "gzip");
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if (stream != NULL)
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return stream;
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memcpy (p, ".bz2", 5);
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stream = fopen_uncompressed (pathname, "bzip2");
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if (stream != NULL)
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return stream;
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return NULL;
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}
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/* An empty alias list. Avoids the need to return NULL from
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charmap_aliases. */
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static char *empty[1];
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/* Returns a NULL terminated list of alias names of a charmap. */
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char **
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charmap_aliases (const char *directory, const char *name)
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{
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FILE *stream;
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char **aliases;
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size_t naliases;
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stream = charmap_open (directory, name);
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if (stream == NULL)
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return empty;
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aliases = NULL;
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naliases = 0;
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while (!feof (stream))
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{
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char *alias = NULL;
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char junk[BUFSIZ];
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if (fscanf (stream, " <code_set_name> %as", &alias) == 1
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|| fscanf (stream, "%% alias %as", &alias) == 1)
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{
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aliases = (char **) xrealloc (aliases,
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(naliases + 2) * sizeof (char *));
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aliases[naliases++] = alias;
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}
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/* Read the rest of the line. */
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if (fgets (junk, sizeof junk, stream) != NULL)
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{
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if (strstr (junk, "CHARMAP") != NULL)
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/* We cannot expect more aliases from now on. */
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break;
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while (strchr (junk, '\n') == NULL
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&& fgets (junk, sizeof junk, stream) != NULL)
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continue;
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}
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}
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fclose (stream);
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if (naliases == 0)
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return empty;
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aliases[naliases] = NULL;
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return aliases;
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}
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/* Frees an alias list returned by charmap_aliases. */
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void
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charmap_free_aliases (char **aliases)
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{
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if (aliases != empty)
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{
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char **p;
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for (p = aliases; *p; p++)
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free (*p);
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free (aliases);
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}
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}
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