169 lines
3.5 KiB
C
169 lines
3.5 KiB
C
/* hostfs.c - Dummy filesystem to provide access to the hosts filesystem */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007,2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/fs.h>
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#include <grub/file.h>
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#include <grub/disk.h>
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#include <grub/misc.h>
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#include <grub/dl.h>
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#include <grub/util/misc.h>
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#include <dirent.h>
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#include <stdio.h>
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#ifndef DT_DIR
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/* dirent.d_type is a BSD extension, not part of POSIX */
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#include <sys/stat.h>
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#include <string.h>
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static int
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is_dir (const char *path, const char *name)
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{
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int len1 = strlen(path);
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int len2 = strlen(name);
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char pathname[len1 + 1 + len2 + 1 + 13];
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strcpy (pathname, path);
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/* Avoid UNC-path "//name" on Cygwin. */
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if (len1 > 0 && pathname[len1 - 1] != '/')
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strcat (pathname, "/");
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strcat (pathname, name);
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struct stat st;
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if (stat (pathname, &st))
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return 0;
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return S_ISDIR (st.st_mode);
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}
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#endif
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static grub_err_t
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grub_hostfs_dir (grub_device_t device, const char *path,
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int (*hook) (const char *filename, int dir))
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{
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DIR *dir;
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/* Check if the disk is our dummy disk. */
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if (grub_strcmp (device->disk->name, "host"))
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return grub_error (GRUB_ERR_BAD_FS, "not a hostfs");
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dir = opendir (path);
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if (! dir)
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return grub_error (GRUB_ERR_BAD_FILENAME,
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"can't open the hostfs directory `%s'", path);
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while (1)
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{
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struct dirent *de;
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de = readdir (dir);
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if (! de)
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break;
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#ifdef DT_DIR
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hook (de->d_name, de->d_type == DT_DIR);
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#else
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hook (de->d_name, is_dir (path, de->d_name));
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#endif
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}
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closedir (dir);
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return GRUB_ERR_NONE;
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}
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/* Open a file named NAME and initialize FILE. */
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static grub_err_t
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grub_hostfs_open (struct grub_file *file, const char *name)
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{
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FILE *f;
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f = fopen (name, "rb");
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if (! f)
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return grub_error (GRUB_ERR_BAD_FILENAME,
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"can't open `%s'", name);
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file->data = f;
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#ifdef __MINGW32__
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file->size = grub_util_get_disk_size (name);
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#else
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fseeko (f, 0, SEEK_END);
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file->size = ftello (f);
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fseeko (f, 0, SEEK_SET);
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#endif
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return GRUB_ERR_NONE;
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}
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static grub_ssize_t
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grub_hostfs_read (grub_file_t file, char *buf, grub_size_t len)
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{
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FILE *f;
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f = (FILE *) file->data;
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fseeko (f, file->offset, SEEK_SET);
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int s = fread (buf, 1, len, f);
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return s;
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}
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static grub_err_t
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grub_hostfs_close (grub_file_t file)
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{
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FILE *f;
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f = (FILE *) file->data;
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fclose (f);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_hostfs_label (grub_device_t device __attribute ((unused)),
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char **label __attribute ((unused)))
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{
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*label = 0;
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return GRUB_ERR_NONE;
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}
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static struct grub_fs grub_hostfs_fs =
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{
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.name = "hostfs",
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.dir = grub_hostfs_dir,
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.open = grub_hostfs_open,
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.read = grub_hostfs_read,
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.close = grub_hostfs_close,
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.label = grub_hostfs_label,
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.next = 0
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};
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GRUB_MOD_INIT(hostfs)
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{
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grub_fs_register (&grub_hostfs_fs);
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}
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GRUB_MOD_FINI(hostfs)
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{
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grub_fs_unregister (&grub_hostfs_fs);
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}
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