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6016620f42
mc/lib/vfs/vfs.c
Slava Zanko 6016620f42 Remove backlinks from lib to src - move global variables(used in lib) to mc_global structure (see lib/global.c) 
Signed-off-by: Slava Zanko <slavazanko@gmail.com>
2011-03-21 23:55:50 +02:00

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/* Virtual File System switch code
Copyright (C) 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2007 Free Software Foundation, Inc.
Written by: 1995 Miguel de Icaza
1995 Jakub Jelinek
1998 Pavel Machek
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License
as published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/**
* \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 <stdio.h>
#include <stdlib.h> /* For atol() */
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <signal.h>
#include <ctype.h> /* is_digit() */
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include "lib/global.h"
#include "lib/strutil.h"
#include "lib/util.h"
#include "lib/widget.h" /* message() */
#ifdef HAVE_CHARSET
#include "lib/charsets.h"
#endif
#include "vfs.h"
#include "utilvfs.h"
#include "gc.h"
/*** global variables ****************************************************************************/
/*** 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;
};
struct vfs_dirinfo
{
DIR *info;
GIConv converter;
};
/*** file scope variables ************************************************************************/
/** They keep track of the current directory */
static struct vfs_class *current_vfs;
static char *current_dir;
static GPtrArray *vfs_openfiles;
static long vfs_free_handle_list = -1;
static GString *vfs_str_buffer;
static GPtrArray *vfs_list = NULL;
static struct dirent *mc_readdir_result = NULL;
static const struct
{
const char *name;
size_t name_len;
const char *substitute;
} url_table[] =
{
/* *INDENT-OFF* */
#ifdef ENABLE_VFS_FTP
{ "ftp://", 6, "/#ftp:" },
#endif
#ifdef ENABLE_VFS_FISH
{ "sh://", 5, "/#sh:" },
{ "ssh://", 6, "/#sh:" },
#endif
#ifdef ENABLE_VFS_SMB
{ "smb://", 6, "/#smb:" },
#endif
{ "a:", 2, "/#a" }
/* *INDENT-ON* */
};
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/**
* Create new VFS handle and put it to the list
*/
static 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;
}
/* --------------------------------------------------------------------------------------------- */
/** Find VFS class by file handle */
static struct vfs_class *
vfs_op (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)
return NULL;
g_assert (h->handle == handle);
return h->vclass;
}
/* --------------------------------------------------------------------------------------------- */
/** Find private file data by file handle */
static void *
vfs_info (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)
return NULL;
g_assert (h->handle == handle);
return h->fsinfo;
}
/* --------------------------------------------------------------------------------------------- */
/** Free open file data for given file handle */
static 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;
}
}
/* --------------------------------------------------------------------------------------------- */
/** Return VFS class for the given prefix */
static struct vfs_class *
vfs_prefix_to_class (char *prefix)
{
guint i;
/* Avoid first class (localfs) that would accept any prefix */
for (i = 1; i < vfs_list->len; i++)
{
struct vfs_class *vfs = (struct vfs_class *) g_ptr_array_index (vfs_list, i);
if (vfs->which != NULL)
{
if (vfs->which (vfs, prefix) == -1)
continue;
return vfs;
}
if (vfs->prefix != NULL && strncmp (prefix, vfs->prefix, strlen (vfs->prefix)) == 0)
return vfs;
}
return NULL;
}
/* --------------------------------------------------------------------------------------------- */
static gboolean
path_magic (const char *path)
{
struct stat buf;
return (stat (path, &buf) != 0);
}
/* --------------------------------------------------------------------------------------------- */
static struct vfs_class *
_vfs_get_class (char *path)
{
char *semi;
char *slash;
struct vfs_class *ret;
g_return_val_if_fail (path, NULL);
semi = strrchr (path, '#');
if (semi == NULL || !path_magic (path))
return NULL;
slash = strchr (semi, PATH_SEP);
*semi = '\0';
if (slash != NULL)
*slash = '\0';
ret = vfs_prefix_to_class (semi + 1);
if (slash != NULL)
*slash = PATH_SEP;
if (ret == NULL)
ret = _vfs_get_class (path);
*semi = '#';
return ret;
}
/* --------------------------------------------------------------------------------------------- */
/* 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, PATH_SEP_STR VFS_ENCODING_PREFIX);
if (semi != NULL)
{
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) + 1; /* 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';
#if 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, path + size - slash, buffer);
else if (buffer->len == 0)
g_string_append_c (buffer, PATH_SEP);
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 int
ferrno (struct vfs_class *vfs)
{
return vfs->ferrno ? (*vfs->ferrno) (vfs) : E_UNKNOWN;
/* Hope that error message is obscure enough ;-) */
}
/* --------------------------------------------------------------------------------------------- */
/**
* Return current directory. If it's local, reread the current directory
* from the OS. You must g_strdup() whatever this function returns.
*/
static const char *
_vfs_get_cwd (void)
{
char *trans;
trans = vfs_translate_path_n (current_dir);
if (_vfs_get_class (trans) == NULL)
{
const char *encoding = vfs_get_encoding (current_dir);
if (encoding == NULL)
{
char *tmp;
tmp = g_get_current_dir ();
if (tmp != NULL)
{ /* One of the directories in the path is not readable */
estr_t state;
char *sys_cwd;
g_string_set_size (vfs_str_buffer, 0);
state = str_vfs_convert_from (str_cnv_from_term, tmp, vfs_str_buffer);
g_free (tmp);
sys_cwd = (state == ESTR_SUCCESS) ? g_strdup (vfs_str_buffer->str) : NULL;
if (sys_cwd != NULL)
{
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 (sys_cwd, &my_stat) == 0
&& mc_stat (current_dir, &my_stat2) == 0
&& my_stat.st_ino == my_stat2.st_ino && my_stat.st_dev == my_stat2.st_dev)
g_free (sys_cwd);
else
{
g_free (current_dir);
current_dir = sys_cwd;
}
}
}
}
}
g_free (trans);
return current_dir;
}
/* --------------------------------------------------------------------------------------------- */
static char *
mc_def_getlocalcopy (const char *filename)
{
char *tmp;
int fdin, fdout;
ssize_t i;
char buffer[8192];
struct stat mystat;
fdin = mc_open (filename, O_RDONLY | O_LINEAR);
if (fdin == -1)
return NULL;
fdout = vfs_mkstemps (&tmp, "vfs", filename);
if (fdout == -1)
goto fail;
while ((i = mc_read (fdin, buffer, sizeof (buffer))) > 0)
{
if (write (fdout, buffer, i) != i)
goto fail;
}
if (i == -1)
goto fail;
i = mc_close (fdin);
fdin = -1;
if (i == -1)
goto fail;
if (close (fdout) == -1)
{
fdout = -1;
goto fail;
}
if (mc_stat (filename, &mystat) != -1)
chmod (tmp, mystat.st_mode);
return tmp;
fail:
if (fdout != -1)
close (fdout);
if (fdin != -1)
mc_close (fdin);
g_free (tmp);
return NULL;
}
/* --------------------------------------------------------------------------------------------- */
static int
mc_def_ungetlocalcopy (struct vfs_class *vfs, const char *filename,
const char *local, int has_changed)
{
int fdin = -1, fdout = -1;
if (has_changed)
{
char buffer[8192];
ssize_t i;
if (!vfs->write)
goto failed;
fdin = open (local, O_RDONLY);
if (fdin == -1)
goto failed;
fdout = mc_open (filename, O_WRONLY | O_TRUNC);
if (fdout == -1)
goto failed;
while ((i = read (fdin, buffer, sizeof (buffer))) > 0)
if (mc_write (fdout, buffer, (size_t) i) != i)
goto failed;
if (i == -1)
goto failed;
if (close (fdin) == -1)
{
fdin = -1;
goto failed;
}
fdin = -1;
if (mc_close (fdout) == -1)
{
fdout = -1;
goto failed;
}
}
unlink (local);
return 0;
failed:
message (D_ERROR, _("Changes to file lost"), "%s", filename);
if (fdout != -1)
mc_close (fdout);
if (fdin != -1)
close (fdin);
unlink (local);
return -1;
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
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_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)
{
guint i;
char *semi;
char *p;
if (filename == NULL)
vfs_die ("vfs_strip_suffix_from_path got NULL: impossible");
p = g_strdup (filename);
semi = strrchr (p, '#');
if (semi == NULL)
return p;
/* Avoid first class (localfs) that would accept any prefix */
for (i = 1; i < vfs_list->len; i++)
{
struct vfs_class *vfs = (struct vfs_class *) g_ptr_array_index (vfs_list, i);
if (vfs->which != NULL)
{
if (vfs->which (vfs, semi + 1) == -1)
continue;
*semi = '\0'; /* Found valid suffix */
break;
}
if (vfs->prefix != NULL && strncmp (semi + 1, vfs->prefix, strlen (vfs->prefix)) == 0)
{
*semi = '\0'; /* Found valid suffix */
break;
}
}
return p;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Splits path extracting vfs part.
*
* Splits path
* \verbatim /p1#op/inpath \endverbatim
* into
* \verbatim inpath,op; \endverbatim
* returns which vfs it is.
* What is left in path is p1. You still want to g_free(path), you DON'T
* want to free neither *inpath nor *op
*/
struct vfs_class *
vfs_split (char *path, char **inpath, char **op)
{
char *semi;
char *slash;
struct vfs_class *ret;
if (path == NULL)
vfs_die ("Cannot split NULL");
semi = strrchr (path, '#');
if (semi == NULL || !path_magic (path))
return NULL;
slash = strchr (semi, PATH_SEP);
*semi = '\0';
if (op != NULL)
*op = NULL;
if (inpath != NULL)
*inpath = NULL;
if (slash != NULL)
*slash = '\0';
ret = vfs_prefix_to_class (semi + 1);
if (ret != NULL)
{
if (op != NULL)
*op = semi + 1;
if (inpath != NULL)
*inpath = slash != NULL ? slash + 1 : NULL;
return ret;
}
if (slash != NULL)
*slash = PATH_SEP;
ret = vfs_split (path, inpath, op);
*semi = '#';
return ret;
}
/* --------------------------------------------------------------------------------------------- */
struct vfs_class *
vfs_get_class (const char *pathname)
{
char *path;
struct vfs_class *vfs;
path = g_strdup (pathname);
vfs = _vfs_get_class (path);
g_free (path);
if (vfs == NULL)
vfs = g_ptr_array_index (vfs_list, 0); /* localfs */
return vfs;
}
/* --------------------------------------------------------------------------------------------- */
const char *
vfs_get_encoding (const char *path)
{
static char result[16];
char *work;
char *semi;
char *slash;
work = g_strdup (path);
/* try found /#enc: */
semi = g_strrstr (work, PATH_SEP_STR VFS_ENCODING_PREFIX);
if (semi != NULL)
{
semi += strlen (VFS_ENCODING_PREFIX) + 1; /* skip "/#enc:" */
slash = strchr (semi, PATH_SEP);
if (slash != NULL)
slash[0] = '\0';
g_strlcpy (result, semi, sizeof (result));
g_free (work);
return result;
}
else
{
g_free (work);
return NULL;
}
}
/* --------------------------------------------------------------------------------------------- */
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;
}
/* --------------------------------------------------------------------------------------------- */
char *
vfs_canon_and_translate (const char *path)
{
char *canon;
char *result;
if (path == NULL)
canon = g_strdup ("");
else
canon = vfs_canon (path);
result = vfs_translate_path_n (canon);
g_free (canon);
return result;
}
/* --------------------------------------------------------------------------------------------- */
int
mc_open (const char *filename, int flags, ...)
{
int mode = 0;
void *info;
va_list ap;
char *file;
struct vfs_class *vfs;
file = vfs_canon_and_translate (filename);
if (file == NULL)
return -1;
vfs = vfs_get_class (file);
/* Get the mode flag */
if (flags & O_CREAT)
{
va_start (ap, flags);
mode = va_arg (ap, int);
va_end (ap);
}
if (vfs->open == NULL)
{
g_free (file);
errno = -EOPNOTSUPP;
return -1;
}
info = vfs->open (vfs, file, flags, mode); /* open must be supported */
g_free (file);
if (info == NULL)
{
errno = ferrno (vfs);
return -1;
}
return vfs_new_handle (vfs, info);
}
/* --------------------------------------------------------------------------------------------- */
/* *INDENT-OFF* */
#define MC_NAMEOP(name, inarg, callarg) \
int mc_##name inarg \
{ \
struct vfs_class *vfs; \
int result; \
char *mpath; \
mpath = vfs_canon_and_translate (path); \
if (mpath == NULL) \
return -1; \
vfs = vfs_get_class (mpath); \
if (vfs == NULL) \
{ \
g_free (mpath); \
return -1; \
} \
result = vfs->name != NULL ? vfs->name callarg : -1; \
g_free (mpath); \
if (result == -1) \
errno = vfs->name != NULL ? ferrno (vfs) : E_NOTSUPP; \
return result; \
}
MC_NAMEOP (chmod, (const char *path, mode_t mode), (vfs, mpath, mode))
MC_NAMEOP (chown, (const char *path, uid_t owner, gid_t group), (vfs, mpath, owner, group))
MC_NAMEOP (utime, (const char *path, struct utimbuf * times), (vfs, mpath, times))
MC_NAMEOP (readlink, (const char *path, char *buf, size_t bufsiz), (vfs, mpath, buf, bufsiz))
MC_NAMEOP (unlink, (const char *path), (vfs, mpath))
MC_NAMEOP (mkdir, (const char *path, mode_t mode), (vfs, mpath, mode))
MC_NAMEOP (rmdir, (const char *path), (vfs, mpath))
MC_NAMEOP (mknod, (const char *path, mode_t mode, dev_t dev), (vfs, mpath, mode, dev))
/* *INDENT-ON* */
/* --------------------------------------------------------------------------------------------- */
int
mc_symlink (const char *name1, const char *path)
{
struct vfs_class *vfs;
int result;
char *mpath;
char *lpath;
char *tmp;
mpath = vfs_canon_and_translate (path);
if (mpath == NULL)
return -1;
tmp = g_strdup (name1);
lpath = vfs_translate_path_n (tmp);
g_free (tmp);
if (lpath != NULL)
{
vfs = vfs_get_class (mpath);
result = vfs->symlink != NULL ? vfs->symlink (vfs, lpath, mpath) : -1;
g_free (lpath);
g_free (mpath);
if (result == -1)
errno = vfs->symlink != NULL ? ferrno (vfs) : E_NOTSUPP;
return result;
}
g_free (mpath);
return -1;
}
/* --------------------------------------------------------------------------------------------- */
/* *INDENT-OFF* */
#define MC_HANDLEOP(name, inarg, callarg) \
ssize_t mc_##name inarg \
{ \
struct vfs_class *vfs; \
int result; \
if (handle == -1) \
return -1; \
vfs = vfs_op (handle); \
if (vfs == NULL) \
return -1; \
result = vfs->name != NULL ? vfs->name callarg : -1; \
if (result == -1) \
errno = vfs->name != NULL ? ferrno (vfs) : E_NOTSUPP; \
return result; \
}
MC_HANDLEOP (read, (int handle, void *buffer, size_t count), (vfs_info (handle), buffer, count))
MC_HANDLEOP (write, (int handle, const void *buf, size_t nbyte), (vfs_info (handle), buf, nbyte))
/* --------------------------------------------------------------------------------------------- */
#define MC_RENAMEOP(name) \
int mc_##name (const char *fname1, const char *fname2) \
{ \
struct vfs_class *vfs; \
int result; \
char *name2, *name1; \
name1 = vfs_canon_and_translate (fname1); \
if (name1 == NULL) \
return -1; \
name2 = vfs_canon_and_translate (fname2); \
if (name2 == NULL) { \
g_free (name1); \
return -1; \
} \
vfs = vfs_get_class (name1); \
if (vfs != vfs_get_class (name2)) \
{ \
errno = EXDEV; \
g_free (name1); \
g_free (name2); \
return -1; \
} \
result = vfs->name != NULL ? vfs->name (vfs, name1, name2) : -1; \
g_free (name1); \
g_free (name2); \
if (result == -1) \
errno = vfs->name != NULL ? ferrno (vfs) : E_NOTSUPP; \
return result; \
}
MC_RENAMEOP (link)
MC_RENAMEOP (rename)
/* *INDENT-ON* */
/* --------------------------------------------------------------------------------------------- */
int
mc_ctl (int handle, int ctlop, void *arg)
{
struct vfs_class *vfs = vfs_op (handle);
if (vfs == NULL)
return 0;
return vfs->ctl ? (*vfs->ctl) (vfs_info (handle), ctlop, arg) : 0;
}
/* --------------------------------------------------------------------------------------------- */
int
mc_setctl (const char *path, int ctlop, void *arg)
{
struct vfs_class *vfs;
int result = -1;
char *mpath;
if (path == NULL)
vfs_die ("You don't want to pass NULL to mc_setctl.");
mpath = vfs_canon_and_translate (path);
if (mpath != NULL)
{
vfs = vfs_get_class (mpath);
result = vfs->setctl != NULL ? vfs->setctl (vfs, mpath, ctlop, arg) : 0;
g_free (mpath);
}
return result;
}
/* --------------------------------------------------------------------------------------------- */
int
mc_close (int handle)
{
struct vfs_class *vfs;
int result;
if (handle == -1 || !vfs_info (handle))
return -1;
vfs = vfs_op (handle);
if (vfs == NULL)
return -1;
if (handle < 3)
return close (handle);
if (!vfs->close)
vfs_die ("VFS must support close.\n");
result = (*vfs->close) (vfs_info (handle));
vfs_free_handle (handle);
if (result == -1)
errno = ferrno (vfs);
return result;
}
/* --------------------------------------------------------------------------------------------- */
DIR *
mc_opendir (const char *dirname)
{
int handle, *handlep;
void *info;
struct vfs_class *vfs;
char *canon;
char *dname;
struct vfs_dirinfo *dirinfo;
const char *encoding;
canon = vfs_canon (dirname);
dname = vfs_translate_path_n (canon);
if (dname != NULL)
{
vfs = vfs_get_class (dname);
info = vfs->opendir ? (*vfs->opendir) (vfs, dname) : NULL;
g_free (dname);
if (info == NULL)
{
errno = vfs->opendir ? ferrno (vfs) : E_NOTSUPP;
g_free (canon);
return NULL;
}
dirinfo = g_new (struct vfs_dirinfo, 1);
dirinfo->info = info;
encoding = vfs_get_encoding (canon);
g_free (canon);
dirinfo->converter = (encoding != NULL) ? str_crt_conv_from (encoding) : str_cnv_from_term;
if (dirinfo->converter == INVALID_CONV)
dirinfo->converter = str_cnv_from_term;
handle = vfs_new_handle (vfs, dirinfo);
handlep = g_new (int, 1);
*handlep = handle;
return (DIR *) handlep;
}
else
{
g_free (canon);
return NULL;
}
}
/* --------------------------------------------------------------------------------------------- */
struct dirent *
mc_readdir (DIR * dirp)
{
int handle;
struct vfs_class *vfs;
struct dirent *entry = NULL;
struct vfs_dirinfo *dirinfo;
estr_t state;
if (!mc_readdir_result)
{
/* We can't just allocate struct dirent as (see man dirent.h)
* struct dirent has VERY nonnaive semantics of allocating
* d_name in it. Moreover, linux's glibc-2.9 allocates dirents _less_,
* than 'sizeof (struct dirent)' making full bitwise (sizeof dirent) copy
* heap corrupter. So, allocate longliving dirent with at least
* (MAXNAMLEN + 1) for d_name in it.
* Strictly saying resulting dirent is unusable as we don't adjust internal
* structures, holding dirent size. But we don't use it in libc infrastructure.
* TODO: to make simpler homemade dirent-alike structure.
*/
mc_readdir_result = (struct dirent *) g_malloc (sizeof (struct dirent) + MAXNAMLEN + 1);
}
if (!dirp)
{
errno = EFAULT;
return NULL;
}
handle = *(int *) dirp;
vfs = vfs_op (handle);
if (vfs == NULL)
return NULL;
dirinfo = vfs_info (handle);
if (vfs->readdir)
{
entry = (*vfs->readdir) (dirinfo->info);
if (entry == NULL)
return NULL;
g_string_set_size (vfs_str_buffer, 0);
state = str_vfs_convert_from (dirinfo->converter, entry->d_name, vfs_str_buffer);
mc_readdir_result->d_ino = entry->d_ino;
g_strlcpy (mc_readdir_result->d_name, vfs_str_buffer->str, MAXNAMLEN + 1);
}
if (entry == NULL)
errno = vfs->readdir ? ferrno (vfs) : E_NOTSUPP;
return (entry != NULL) ? mc_readdir_result : NULL;
}
/* --------------------------------------------------------------------------------------------- */
int
mc_closedir (DIR * dirp)
{
int handle = *(int *) dirp;
struct vfs_class *vfs;
int result = -1;
vfs = vfs_op (handle);
if (vfs != NULL)
{
struct vfs_dirinfo *dirinfo;
dirinfo = vfs_info (handle);
if (dirinfo->converter != str_cnv_from_term)
str_close_conv (dirinfo->converter);
result = vfs->closedir ? (*vfs->closedir) (dirinfo->info) : -1;
vfs_free_handle (handle);
g_free (dirinfo);
}
g_free (dirp);
return result;
}
/* --------------------------------------------------------------------------------------------- */
int
mc_stat (const char *filename, struct stat *buf)
{
struct vfs_class *vfs;
int result;
char *path;
path = vfs_canon_and_translate (filename);
if (path == NULL)
return -1;
vfs = vfs_get_class (path);
if (vfs == NULL)
{
g_free (path);
return -1;
}
result = vfs->stat ? (*vfs->stat) (vfs, path, buf) : -1;
g_free (path);
if (result == -1)
errno = vfs->name ? ferrno (vfs) : E_NOTSUPP;
return result;
}
/* --------------------------------------------------------------------------------------------- */
int
mc_lstat (const char *filename, struct stat *buf)
{
struct vfs_class *vfs;
int result;
char *path;
path = vfs_canon_and_translate (filename);
if (path == NULL)
return -1;
vfs = vfs_get_class (path);
if (vfs == NULL)
{
g_free (path);
return -1;
}
result = vfs->lstat ? (*vfs->lstat) (vfs, path, buf) : -1;
g_free (path);
if (result == -1)
errno = vfs->name ? ferrno (vfs) : E_NOTSUPP;
return result;
}
/* --------------------------------------------------------------------------------------------- */
int
mc_fstat (int handle, struct stat *buf)
{
struct vfs_class *vfs;
int result;
if (handle == -1)
return -1;
vfs = vfs_op (handle);
if (vfs == NULL)
return -1;
result = vfs->fstat ? (*vfs->fstat) (vfs_info (handle), buf) : -1;
if (result == -1)
errno = vfs->name ? ferrno (vfs) : E_NOTSUPP;
return result;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Return current directory. If it's local, reread the current directory
* from the OS. Put directory to the provided buffer.
*/
char *
mc_get_current_wd (char *buffer, size_t size)
{
const char *cwd = _vfs_get_cwd ();
g_strlcpy (buffer, cwd, size);
return buffer;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Return current directory without any OS calls.
*/
char *
vfs_get_current_dir (void)
{
return current_dir;
}
/* --------------------------------------------------------------------------------------------- */
off_t
mc_lseek (int fd, off_t offset, int whence)
{
struct vfs_class *vfs;
off_t result;
if (fd == -1)
return -1;
vfs = vfs_op (fd);
if (vfs == NULL)
return -1;
result = vfs->lseek ? (*vfs->lseek) (vfs_info (fd), offset, whence) : -1;
if (result == -1)
errno = vfs->lseek ? ferrno (vfs) : E_NOTSUPP;
return result;
}
/* --------------------------------------------------------------------------------------------- */
/**
* remove //, /./ and /../
*/
char *
vfs_canon (const char *path)
{
if (!path)
vfs_die ("Cannot canonicalize NULL");
/* Relative to current directory */
if (*path != PATH_SEP)
{
char *local, *result;
local = concat_dir_and_file (current_dir, path);
result = vfs_canon (local);
g_free (local);
return result;
}
/*
* So we have path of following form:
* /p1/p2#op/.././././p3#op/p4. Good luck.
*/
{
char *result = g_strdup (path);
canonicalize_pathname (result);
return result;
}
}
/* --------------------------------------------------------------------------------------------- */
/**
* VFS chdir.
* Return 0 on success, -1 on failure.
*/
int
mc_chdir (const char *path)
{
char *new_dir;
char *trans_dir;
struct vfs_class *old_vfs, *new_vfs;
vfsid old_vfsid;
int result;
new_dir = vfs_canon (path);
trans_dir = vfs_translate_path_n (new_dir);
if (trans_dir != NULL)
{
new_vfs = vfs_get_class (trans_dir);
if (!new_vfs->chdir)
{
g_free (new_dir);
g_free (trans_dir);
return -1;
}
result = (*new_vfs->chdir) (new_vfs, trans_dir);
if (result == -1)
{
errno = ferrno (new_vfs);
g_free (new_dir);
g_free (trans_dir);
return -1;
}
old_vfsid = vfs_getid (current_vfs, current_dir);
old_vfs = current_vfs;
/* Actually change directory */
g_free (current_dir);
current_dir = new_dir;
current_vfs = new_vfs;
/* This function uses the new current_dir implicitly */
vfs_stamp_create (old_vfs, old_vfsid);
/* Sometimes we assume no trailing slash on cwd */
if (*current_dir)
{
char *p;
p = strchr (current_dir, 0) - 1;
if (*p == PATH_SEP && p > current_dir)
*p = 0;
}
g_free (trans_dir);
return 0;
}
else
{
g_free (new_dir);
return -1;
}
}
/* --------------------------------------------------------------------------------------------- */
/* 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 char *filename)
{
struct vfs_class *vfs;
char *fname;
fname = vfs_canon_and_translate (filename);
if (fname == NULL)
return VFSF_UNKNOWN;
vfs = vfs_get_class (fname);
g_free (fname);
return vfs->flags;
}
/* --------------------------------------------------------------------------------------------- */
char *
mc_getlocalcopy (const char *pathname)
{
char *result = NULL;
char *path;
path = vfs_canon_and_translate (pathname);
if (path != NULL)
{
struct vfs_class *vfs = vfs_get_class (path);
result = vfs->getlocalcopy != NULL ?
vfs->getlocalcopy (vfs, path) : mc_def_getlocalcopy (path);
g_free (path);
if (result == NULL)
errno = ferrno (vfs);
}
return result;
}
/* --------------------------------------------------------------------------------------------- */
int
mc_ungetlocalcopy (const char *pathname, const char *local, int has_changed)
{
int return_value = -1;
char *path;
path = vfs_canon_and_translate (pathname);
if (path != NULL)
{
struct vfs_class *vfs = vfs_get_class (path);
return_value = vfs->ungetlocalcopy != NULL ?
vfs->ungetlocalcopy (vfs, path, local, has_changed) :
mc_def_ungetlocalcopy (vfs, path, local, has_changed);
g_free (path);
}
return return_value;
}
/* --------------------------------------------------------------------------------------------- */
void
vfs_init (void)
{
/* create the VFS handle arrays */
vfs_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)
{
current_dir = g_strdup (PATH_SEP_STR);
_vfs_get_cwd ();
if (strlen (current_dir) > MC_MAXPATHLEN - 2)
vfs_die ("Current dir too long.\n");
current_vfs = vfs_get_class (current_dir);
}
/* --------------------------------------------------------------------------------------------- */
void
vfs_shut (void)
{
guint i;
vfs_gc_done ();
g_free (current_dir);
for (i = 0; i < vfs_list->len; i++)
{
struct vfs_class *vfs = (struct vfs_class *) g_ptr_array_index (vfs_list, i);
if (vfs->done != NULL)
vfs->done (vfs);
}
g_ptr_array_free (vfs_openfiles, TRUE);
g_ptr_array_free (vfs_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_list->len; i++)
{
struct vfs_class *vfs = (struct vfs_class *) g_ptr_array_index (vfs_list, i);
if (vfs->fill_names != NULL)
vfs->fill_names (vfs, func);
}
}
/* --------------------------------------------------------------------------------------------- */
/**
* Returns vfs path corresponding to given url. If passed string is
* not recognized as url, g_strdup(url) is returned.
*/
char *
vfs_translate_url (const char *url)
{
size_t i;
for (i = 0; i < sizeof (url_table) / sizeof (url_table[0]); i++)
if (strncmp (url, url_table[i].name, url_table[i].name_len) == 0)
return g_strconcat (url_table[i].substitute, url + url_table[i].name_len,
(char *) NULL);
return g_strdup (url);
}
/* --------------------------------------------------------------------------------------------- */
gboolean
vfs_file_is_local (const char *filename)
{
return (vfs_file_class_flags (filename) & VFSF_LOCAL) != 0;
}
/* --------------------------------------------------------------------------------------------- */
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