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mc/lib/vfs/vfs.c

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/*
Virtual File System switch code
Copyright (C) 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2007, 2011
The Free Software Foundation, Inc.
Written by: 1995 Miguel de Icaza
Jakub Jelinek, 1995
Pavel Machek, 1998
This file is part of the Midnight Commander.
The Midnight Commander is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
The Midnight Commander is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file
* \brief Source: Virtual File System switch code
* \author Miguel de Icaza
* \author Jakub Jelinek
* \author Pavel Machek
* \date 1995, 1998
* \warning funtions like extfs_lstat() have right to destroy any
* strings you pass to them. This is acutally ok as you g_strdup what
* you are passing to them, anyway; still, beware.
*
* Namespace: exports *many* functions with vfs_ prefix; exports
* parse_ls_lga and friends which do not have that prefix.
*/
#include <config.h>
#include <errno.h>
#include "lib/global.h"
#include "lib/strutil.h"
#include "lib/util.h"
#include "lib/widget.h" /* message() */
#include "lib/event.h"
#ifdef HAVE_CHARSET
#include "lib/charsets.h"
#endif
#include "vfs.h"
#include "utilvfs.h"
#include "gc.h"
extern struct dirent *mc_readdir_result;
/*** global variables ****************************************************************************/
GPtrArray *vfs__classes_list = NULL;
GString *vfs_str_buffer = NULL;
struct vfs_class *current_vfs = NULL;
/*** file scope macro definitions ****************************************************************/
#if defined(_AIX) && !defined(NAME_MAX)
#define NAME_MAX FILENAME_MAX
#endif
#define VFS_FIRST_HANDLE 100
#define ISSLASH(a) (!a || (a == '/'))
/*** file scope type declarations ****************************************************************/
struct vfs_openfile
{
int handle;
struct vfs_class *vclass;
void *fsinfo;
};
/*** file scope variables ************************************************************************/
/** They keep track of the current directory */
static vfs_path_t *current_path = NULL;
static GPtrArray *vfs_openfiles;
static long vfs_free_handle_list = -1;
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/* now used only by vfs_translate_path, but could be used in other vfs
* plugin to automatic detect encoding
* path - path to translate
* size - how many bytes from path translate
* defcnv - convertor, that is used as default, when path does not contain any
* #enc: subtring
* buffer - used to store result of translation
*/
static estr_t
_vfs_translate_path (const char *path, int size, GIConv defcnv, GString * buffer)
{
const char *semi;
const char *slash;
estr_t state = ESTR_SUCCESS;
if (size == 0)
return ESTR_SUCCESS;
size = (size > 0) ? size : (signed int) strlen (path);
/* try found /#enc: */
semi = g_strrstr_len (path, size, VFS_ENCODING_PREFIX);
if (semi != NULL && (semi == path || *(semi - 1) == PATH_SEP))
{
char encoding[16];
GIConv coder = INVALID_CONV;
int ms;
/* first must be translated part before #enc: */
ms = semi - path;
state = _vfs_translate_path (path, ms, defcnv, buffer);
if (state != ESTR_SUCCESS)
return state;
/* now can be translated part after #enc: */
semi += strlen (VFS_ENCODING_PREFIX); /* skip "#enc:" */
slash = strchr (semi, PATH_SEP);
/* ignore slashes after size; */
if (slash - path >= size)
slash = NULL;
ms = (slash != NULL) ? slash - semi : (int) strlen (semi);
ms = min ((unsigned int) ms, sizeof (encoding) - 1);
/* limit encoding size (ms) to path size (size) */
if (semi + ms > path + size)
ms = path + size - semi;
memcpy (encoding, semi, ms);
encoding[ms] = '\0';
#ifdef HAVE_CHARSET
if (is_supported_encoding (encoding))
coder = str_crt_conv_to (encoding);
#endif
if (coder != INVALID_CONV)
{
if (slash != NULL)
state = str_vfs_convert_to (coder, slash + 1, path + size - slash - 1, buffer);
str_close_conv (coder);
return state;
}
errno = EINVAL;
state = ESTR_FAILURE;
}
else
{
/* path can be translated whole at once */
state = str_vfs_convert_to (defcnv, path, size, buffer);
}
return state;
}
/* --------------------------------------------------------------------------------------------- */
static struct vfs_openfile *
vfs_get_openfile (int handle)
{
struct vfs_openfile *h;
if (handle < VFS_FIRST_HANDLE || (guint) (handle - VFS_FIRST_HANDLE) >= vfs_openfiles->len)
return NULL;
h = (struct vfs_openfile *) g_ptr_array_index (vfs_openfiles, handle - VFS_FIRST_HANDLE);
if (h == NULL)
return NULL;
g_assert (h->handle == handle);
return h;
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/** Free open file data for given file handle */
void
vfs_free_handle (int handle)
{
const int idx = handle - VFS_FIRST_HANDLE;
if (handle >= VFS_FIRST_HANDLE && (guint) idx < vfs_openfiles->len)
{
struct vfs_openfile *h;
h = (struct vfs_openfile *) g_ptr_array_index (vfs_openfiles, idx);
g_free (h);
g_ptr_array_index (vfs_openfiles, idx) = (void *) vfs_free_handle_list;
vfs_free_handle_list = idx;
}
}
/* --------------------------------------------------------------------------------------------- */
/** Find private file data by file handle */
void *
vfs_class_data_find_by_handle (int handle)
{
struct vfs_openfile *h;
h = vfs_get_openfile (handle);
return h == NULL ? NULL : h->fsinfo;
}
/* --------------------------------------------------------------------------------------------- */
/** Find VFS class by file handle */
struct vfs_class *
vfs_class_find_by_handle (int handle)
{
struct vfs_openfile *h;
h = vfs_get_openfile (handle);
return h == NULL ? NULL : h->vclass;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Create new VFS handle and put it to the list
*/
int
vfs_new_handle (struct vfs_class *vclass, void *fsinfo)
{
struct vfs_openfile *h;
h = g_new (struct vfs_openfile, 1);
h->fsinfo = fsinfo;
h->vclass = vclass;
/* Allocate the first free handle */
h->handle = vfs_free_handle_list;
if (h->handle == -1)
{
/* No free allocated handles, allocate one */
h->handle = vfs_openfiles->len;
g_ptr_array_add (vfs_openfiles, h);
}
else
{
vfs_free_handle_list = (long) g_ptr_array_index (vfs_openfiles, vfs_free_handle_list);
g_ptr_array_index (vfs_openfiles, h->handle) = h;
}
h->handle += VFS_FIRST_HANDLE;
return h->handle;
}
/* --------------------------------------------------------------------------------------------- */
int
vfs_ferrno (struct vfs_class *vfs)
{
return vfs->ferrno ? (*vfs->ferrno) (vfs) : E_UNKNOWN;
/* Hope that error message is obscure enough ;-) */
}
/* --------------------------------------------------------------------------------------------- */
gboolean
vfs_register_class (struct vfs_class * vfs)
{
if (vfs->init != NULL) /* vfs has own initialization function */
if (!vfs->init (vfs)) /* but it failed */
return FALSE;
g_ptr_array_add (vfs__classes_list, vfs);
return TRUE;
}
/* --------------------------------------------------------------------------------------------- */
/** Strip known vfs suffixes from a filename (possible improvement: strip
* suffix from last path component).
* \return a malloced string which has to be freed.
*/
char *
vfs_strip_suffix_from_filename (const char *filename)
{
char *semi, *p, *vfs_prefix;
if (filename == NULL)
vfs_die ("vfs_strip_suffix_from_path got NULL: impossible");
p = g_strdup (filename);
semi = g_strrstr (p, VFS_PATH_URL_DELIMITER);
if (semi == NULL)
return p;
*semi = '\0';
vfs_prefix = strrchr (p, PATH_SEP);
if (vfs_prefix == NULL)
{
*semi = *VFS_PATH_URL_DELIMITER;
return p;
}
*vfs_prefix = '\0';
return p;
}
/* --------------------------------------------------------------------------------------------- */
char *
vfs_translate_path (const char *path)
{
estr_t state;
g_string_set_size (vfs_str_buffer, 0);
state = _vfs_translate_path (path, -1, str_cnv_from_term, vfs_str_buffer);
/*
strict version
return (state == 0) ? vfs_str_buffer->data : NULL;
*/
return (state != ESTR_FAILURE) ? vfs_str_buffer->str : NULL;
}
/* --------------------------------------------------------------------------------------------- */
char *
vfs_translate_path_n (const char *path)
{
char *result;
result = vfs_translate_path (path);
return (result != NULL) ? g_strdup (result) : NULL;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Get current directory without any OS calls.
*
* @return string contain current path
*/
char *
vfs_get_current_dir (void)
{
return vfs_path_to_str (current_path);
}
/* --------------------------------------------------------------------------------------------- */
/**
* Get raw current directory object without any OS calls.
*
* @return object contain current path
*/
const vfs_path_t *
vfs_get_raw_current_dir (void)
{
return current_path;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Set current directory object.
*
* @param vpath new path
*/
void
vfs_set_raw_current_dir (const vfs_path_t * vpath)
{
vfs_path_free (current_path);
current_path = (vfs_path_t *) vpath;
}
/* --------------------------------------------------------------------------------------------- */
/* Return TRUE is the current VFS class is local */
gboolean
vfs_current_is_local (void)
{
return (current_vfs->flags & VFSF_LOCAL) != 0;
}
/* --------------------------------------------------------------------------------------------- */
/* Return flags of the VFS class of the given filename */
vfs_class_flags_t
vfs_file_class_flags (const vfs_path_t * vpath)
{
const vfs_path_element_t *path_element;
path_element = vfs_path_get_by_index (vpath, -1);
if (!vfs_path_element_valid (path_element))
return VFSF_UNKNOWN;
return path_element->class->flags;
}
/* --------------------------------------------------------------------------------------------- */
void
vfs_init (void)
{
/* create the VFS handle arrays */
vfs__classes_list = g_ptr_array_new ();
/* create the VFS handle array */
vfs_openfiles = g_ptr_array_new ();
vfs_str_buffer = g_string_new ("");
}
/* --------------------------------------------------------------------------------------------- */
void
vfs_setup_work_dir (void)
{
const vfs_path_element_t *path_element;
vfs_setup_cwd ();
/* FIXME: is we really need for this check? */
/*
if (strlen (current_dir) > MC_MAXPATHLEN - 2)
vfs_die ("Current dir too long.\n");
*/
path_element = vfs_path_get_by_index (current_path, -1);
current_vfs = path_element->class;
}
/* --------------------------------------------------------------------------------------------- */
void
vfs_shut (void)
{
guint i;
vfs_gc_done ();
vfs_set_raw_current_dir (NULL);
for (i = 0; i < vfs__classes_list->len; i++)
{
struct vfs_class *vfs = (struct vfs_class *) g_ptr_array_index (vfs__classes_list, i);
if (vfs->done != NULL)
vfs->done (vfs);
}
g_ptr_array_free (vfs_openfiles, TRUE);
g_ptr_array_free (vfs__classes_list, TRUE);
g_string_free (vfs_str_buffer, TRUE);
g_free (mc_readdir_result);
}
/* --------------------------------------------------------------------------------------------- */
/**
* These ones grab information from the VFS
* and handles them to an upper layer
*/
void
vfs_fill_names (fill_names_f func)
{
guint i;
for (i = 0; i < vfs__classes_list->len; i++)
{
struct vfs_class *vfs = (struct vfs_class *) g_ptr_array_index (vfs__classes_list, i);
if (vfs->fill_names != NULL)
vfs->fill_names (vfs, func);
}
}
/* --------------------------------------------------------------------------------------------- */
gboolean
vfs_file_is_local (const vfs_path_t * vpath)
{
return (vfs_file_class_flags (vpath) & VFSF_LOCAL) != 0;
}
/* --------------------------------------------------------------------------------------------- */
void
vfs_print_message (const char *msg, ...)
{
ev_vfs_print_message_t event_data;
va_start (event_data.ap, msg);
event_data.msg = msg;
mc_event_raise (MCEVENT_GROUP_CORE, "vfs_print_message", (gpointer) & event_data);
va_end (event_data.ap);
}
/* --------------------------------------------------------------------------------------------- */
/**
* If it's local, reread the current directory
* from the OS.
*/
void
vfs_setup_cwd (void)
{
const vfs_path_element_t *path_element;
if (vfs_get_raw_current_dir () == NULL)
{
char *tmp;
tmp = g_get_current_dir ();
vfs_set_raw_current_dir (vfs_path_from_str (tmp));
g_free (tmp);
}
path_element = vfs_path_get_by_index (vfs_get_raw_current_dir (), -1);
if ((path_element->class->flags & VFSF_LOCAL) != 0)
{
char *current_dir;
vfs_path_t *tmp_vpath;
current_dir = g_get_current_dir ();
tmp_vpath = vfs_path_from_str (current_dir);
g_free (current_dir);
if (tmp_vpath != NULL)
{ /* One of the directories in the path is not readable */
struct stat my_stat, my_stat2;
/* Check if it is O.K. to use the current_dir */
if (!(mc_global.vfs.cd_symlinks
&& mc_stat (tmp_vpath, &my_stat) == 0
&& mc_stat (vfs_get_raw_current_dir (), &my_stat2) == 0
&& my_stat.st_ino == my_stat2.st_ino && my_stat.st_dev == my_stat2.st_dev))
vfs_set_raw_current_dir (tmp_vpath);
else
vfs_path_free (tmp_vpath);
}
}
}
/* --------------------------------------------------------------------------------------------- */
/**
* Return current directory. If it's local, reread the current directory
* from the OS.
*/
char *
_vfs_get_cwd (void)
{
vfs_setup_cwd ();
return vfs_path_to_str (vfs_get_raw_current_dir ());
}
/* --------------------------------------------------------------------------------------------- */
/**
* Change encoding for last part (vfs_path_element_t) of vpath
*
* @param vpath pointer to path structure
* encoding name of charset
*
* @return pointer to path structure (for use function in anoter functions)
*/
vfs_path_t *
vfs_change_encoding (vfs_path_t * vpath, const char *encoding)
{
vfs_path_element_t *path_element;
path_element = (vfs_path_element_t *) vfs_path_get_by_index (vpath, -1);
/* don't add current encoding */
if ((path_element->encoding != NULL) && (strcmp (encoding, path_element->encoding) == 0))
return vpath;
g_free (path_element->encoding);
path_element->encoding = g_strdup (encoding);
if (vfs_path_element_need_cleanup_converter (path_element))
str_close_conv (path_element->dir.converter);
path_element->dir.converter = str_crt_conv_from (path_element->encoding);
return vpath;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Preallocate space for file in new place for ensure that file
* will be fully copied with less fragmentation.
*
* @param dest_desc mc VFS file handler
* @param src_fsize source file size
* @param dest_fsize destination file size (if destination exists, otherwise should be 0)
*
* @return 0 if success and non-zero otherwise.
* Note: function doesn't touch errno global variable.
*/
int
vfs_preallocate (int dest_vfs_fd, off_t src_fsize, off_t dest_fsize)
{
#ifndef HAVE_POSIX_FALLOCATE
(void) dest_vfs_fd;
(void) src_fsize;
(void) dest_fsize;
return 0;
#else /* HAVE_POSIX_FALLOCATE */
int *dest_fd;
struct vfs_class *dest_class;
if (!mc_global.vfs.preallocate_space)
return 0;
dest_class = vfs_class_find_by_handle (dest_vfs_fd);
if ((dest_class->flags & VFSF_LOCAL) == 0)
return 0;
dest_fd = (int *) vfs_class_data_find_by_handle (dest_vfs_fd);
if (dest_fd == NULL)
return 0;
if (src_fsize == 0)
return 0;
return posix_fallocate (*dest_fd, dest_fsize, src_fsize - dest_fsize);
#endif /* HAVE_POSIX_FALLOCATE */
}
/* --------------------------------------------------------------------------------------------- */
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