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mc/vfs/vfs.c
Denys Vlasenko e064bd60df De-inline a few functions which are large 
...or not-so-large but nevertheless
contain more than one function call,
or contain loops, or contain if's and at least one
function call, or contain largish objects on stack.

In my experience, in those cases the code size
growth is big enough to not inline stuff.

I guess some of the really big functions
are defined inline because they have, or had in the past,
just one callsite.

But for a few years gcc already does it automatically,
no need to do it by hand and risk code size explosion
when later during code evolution another callsite
is created. This optimization by hand is simply
no longer needed.

Anyway, here is the code size difference:

   text    data     bss     dec     hex filename
 572337   17944  177820  768101   bb865 mc.t5/.obj/src/mc
 567697   17944  177820  763461   ba645 mc.t6/.obj/src/mc

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Signed-off-by: Sergei Trofimovich <slyfox@inbox.ru>
2009-08-31 07:12:59 +03:00

1322 lines
31 KiB
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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 "../src/global.h"
#include "../src/wtools.h" /* message() */
#include "../src/main.h" /* print_vfs_message */
#include "../src/strutil.h"
#include "utilvfs.h"
#include "gc.h"
#include "vfs.h"
#ifdef USE_NETCODE
# include "tcputil.h"
#endif
#include "ftpfs.h"
#include "mcfs.h"
#include "smbfs.h"
#include "local.h"
/** They keep track of the current directory */
static struct vfs_class *current_vfs;
static char *current_dir;
struct vfs_openfile {
int handle;
struct vfs_class *vclass;
void *fsinfo;
};
struct vfs_dirinfo{
DIR *info;
GIConv converter;
};
static GPtrArray *vfs_openfiles;
static long vfs_free_handle_list = -1;
#define VFS_FIRST_HANDLE 100
static struct vfs_class *localfs_class;
static GString *vfs_str_buffer;
static const char *supported_encodings[] = {
"UTF8",
"UTF-8",
"BIG5",
"ASCII",
"ISO8859",
"ISO-8859",
"ISO_8859",
"KOI8",
"CP852",
"CP866",
"CP125",
NULL
};
/** 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)
{
if (handle < VFS_FIRST_HANDLE ||
(guint)(handle - VFS_FIRST_HANDLE) >= vfs_openfiles->len)
return;
g_ptr_array_index (vfs_openfiles, handle - VFS_FIRST_HANDLE) =
(void *) vfs_free_handle_list;
vfs_free_handle_list = handle - VFS_FIRST_HANDLE;
}
static struct vfs_class *vfs_list;
int
vfs_register_class (struct vfs_class *vfs)
{
if (vfs->init) /* vfs has own initialization function */
if (!(*vfs->init)(vfs)) /* but it failed */
return 0;
vfs->next = vfs_list;
vfs_list = vfs;
return 1;
}
/** Return VFS class for the given prefix */
static struct vfs_class *
vfs_prefix_to_class (char *prefix)
{
struct vfs_class *vfs;
/* Avoid last class (localfs) that would accept any prefix */
for (vfs = vfs_list; vfs->next; vfs = vfs->next) {
if (vfs->which) {
if ((*vfs->which) (vfs, prefix) == -1)
continue;
return vfs;
}
if (vfs->prefix
&& !strncmp (prefix, vfs->prefix, strlen (vfs->prefix)))
return vfs;
}
return NULL;
}
/** 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)
{
struct vfs_class *vfs;
char *semi;
char *p;
if (!filename)
vfs_die ("vfs_strip_suffix_from_path got NULL: impossible");
p = g_strdup (filename);
if (!(semi = strrchr (p, '#')))
return p;
/* Avoid last class (localfs) that would accept any prefix */
for (vfs = vfs_list; vfs->next; vfs = vfs->next) {
if (vfs->which) {
if ((*vfs->which) (vfs, semi + 1) == -1)
continue;
*semi = '\0'; /* Found valid suffix */
return p;
}
if (vfs->prefix
&& !strncmp (semi + 1, vfs->prefix, strlen (vfs->prefix))) {
*semi = '\0'; /* Found valid suffix */
return p;
}
}
return p;
}
static int
path_magic (const char *path)
{
struct stat buf;
if (!stat(path, &buf))
return 0;
return 1;
}
/**
* Splits path '/p1#op/inpath' into inpath,op; 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)
vfs_die("Cannot split NULL");
semi = strrchr (path, '#');
if (!semi || !path_magic(path))
return NULL;
slash = strchr (semi, PATH_SEP);
*semi = 0;
if (op)
*op = NULL;
if (inpath)
*inpath = NULL;
if (slash)
*slash = 0;
if ((ret = vfs_prefix_to_class (semi+1))){
if (op)
*op = semi + 1;
if (inpath)
*inpath = slash ? slash + 1 : NULL;
return ret;
}
if (slash)
*slash = PATH_SEP;
ret = vfs_split (path, inpath, op);
*semi = '#';
return ret;
}
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 || !path_magic (path))
return NULL;
slash = strchr (semi, PATH_SEP);
*semi = 0;
if (slash)
*slash = 0;
ret = vfs_prefix_to_class (semi+1);
if (slash)
*slash = PATH_SEP;
if (!ret)
ret = _vfs_get_class (path);
*semi = '#';
return ret;
}
struct vfs_class *
vfs_get_class (const char *pathname)
{
struct vfs_class *vfs;
char *path = g_strdup (pathname);
vfs = _vfs_get_class (path);
g_free (path);
if (!vfs)
vfs = localfs_class;
return vfs;
}
const char *
vfs_get_encoding (const char *path)
{
static char result[16];
char *work;
char *semi;
char *slash;
work = g_strdup (path);
semi = g_strrstr (work, "#enc:");
if (semi != NULL) {
semi+= 5 * sizeof (char);
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;
}
}
/* return if encoding can by used in vfs (is ascci full compactible) */
/* contains only a few encoding now */
static int
vfs_supported_enconding (const char *encoding) {
int t;
int result = 0;
for (t = 0; supported_encodings[t] != NULL; t++) {
result+= (g_ascii_strncasecmp (encoding, supported_encodings[t],
strlen (supported_encodings[t])) == 0);
}
return result;
}
/* 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 *ps;
const char *slash;
estr_t state = ESTR_SUCCESS;
static char encoding[16];
GIConv coder;
int ms;
if (size == 0) return 0;
size = ( size > 0) ? size : (signed int)strlen (path);
/* try found #end: */
semi = g_strrstr_len (path, size, "#enc:");
if (semi != NULL) {
/* first must be translated part before #enc: */
ms = semi - path;
/* remove '/' before #enc */
ps = str_cget_prev_char (semi);
if (ps[0] == PATH_SEP) ms = ps - path;
state = _vfs_translate_path (path, ms, defcnv, buffer);
if (state != ESTR_SUCCESS)
return state;
/* now can be translated part after #enc: */
semi+= 5;
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';
switch (vfs_supported_enconding (encoding)) {
case 1:
coder = str_crt_conv_to (encoding);
if (coder != INVALID_CONV) {
if (slash != NULL) {
state = str_vfs_convert_to (coder, slash,
path + size - slash, buffer);
} else if (buffer->str[0] == '\0') {
/* exmaple "/#enc:utf-8" */
g_string_append_c(buffer, PATH_SEP);
}
str_close_conv (coder);
return state;
} else {
errno = EINVAL;
return ESTR_FAILURE;
}
break;
default:
errno = EINVAL;
return ESTR_FAILURE;
}
} else {
/* path can be translated whole at once */
state = str_vfs_convert_to (defcnv, path, size, buffer);
return state;
}
return ESTR_SUCCESS;
}
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;
}
static int
ferrno (struct vfs_class *vfs)
{
return vfs->ferrno ? (*vfs->ferrno)(vfs) : E_UNKNOWN;
/* Hope that error message is obscure enough ;-) */
}
int
mc_open (const char *filename, int flags, ...)
{
int mode;
void *info;
va_list ap;
char *file = vfs_canon_and_translate (filename);
if (file != NULL) {
struct vfs_class *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);
} else
mode = 0;
if (!vfs->open) {
g_free (file);
errno = -EOPNOTSUPP;
return -1;
}
info = (*vfs->open) (vfs, file, flags, mode); /* open must be supported */
g_free (file);
if (!info){
errno = ferrno (vfs);
return -1;
}
return vfs_new_handle (vfs, info);
} else return -1;
}
#define MC_NAMEOP(name, inarg, callarg) \
int mc_##name inarg \
{ \
struct vfs_class *vfs; \
int result; \
char *mpath = vfs_canon_and_translate (path); \
if (mpath != NULL) { \
vfs = vfs_get_class (mpath); \
if (vfs == NULL){ \
g_free (mpath); \
return -1; \
} \
result = vfs->name ? (*vfs->name)callarg : -1; \
g_free (mpath); \
if (result == -1) \
errno = vfs->name ? ferrno (vfs) : E_NOTSUPP; \
return result; \
} else return -1; \
}
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, int 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))
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) {
tmp = g_strdup (name1);
lpath = vfs_translate_path_n (tmp);
g_free (tmp);
if (lpath != NULL) {
vfs = vfs_get_class (mpath);
result = vfs->symlink ? (*vfs->symlink) (vfs, lpath, mpath) : -1;
g_free (lpath);
if (result == -1)
errno = vfs->symlink ? ferrno (vfs) : E_NOTSUPP;
return result;
}
g_free (mpath);
}
return -1;
}
#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 ? (*vfs->name)callarg : -1; \
if (result == -1) \
errno = vfs->name ? ferrno (vfs) : E_NOTSUPP; \
return result; \
}
MC_HANDLEOP(read, (int handle, void *buffer, int count), (vfs_info (handle), buffer, count))
MC_HANDLEOP(write, (int handle, const void *buf, int 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) { \
name2 = vfs_canon_and_translate (fname2); \
if (name2 != NULL) { \
vfs = vfs_get_class (name1); \
if (vfs != vfs_get_class (name2)){ \
errno = EXDEV; \
g_free (name1); \
g_free (name2); \
return -1; \
} \
result = vfs->name ? (*vfs->name)(vfs, name1, name2) : -1; \
g_free (name1); \
g_free (name2); \
if (result == -1) \
errno = vfs->name ? ferrno (vfs) : E_NOTSUPP; \
return result; \
} else { \
g_free (name1); \
return -1; \
} \
} else return -1; \
}
MC_RENAMEOP (link)
MC_RENAMEOP (rename)
int
mc_ctl (int handle, int ctlop, void *arg)
{
struct vfs_class *vfs = vfs_op (handle);
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;
char *mpath;
if (!path)
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 ? (*vfs->setctl)(vfs, mpath, ctlop, arg) : 0;
g_free (mpath);
return result;
} else return -1;
}
int
mc_close (int handle)
{
struct vfs_class *vfs;
int result;
if (handle == -1 || !vfs_info (handle))
return -1;
vfs = vfs_op (handle);
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){
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;
}
}
static struct dirent * mc_readdir_result = 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
* (NAME_MAX + 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 *)malloc(sizeof(struct dirent) + NAME_MAX + 1);
}
if (!dirp) {
errno = EFAULT;
return NULL;
}
handle = *(int *) dirp;
vfs = vfs_op (handle);
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, NAME_MAX + 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 = vfs_op (handle);
int result;
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) {
vfs = vfs_get_class (path);
result = vfs->stat ? (*vfs->stat) (vfs, path, buf) : -1;
g_free (path);
if (result == -1)
errno = vfs->name ? ferrno (vfs) : E_NOTSUPP;
return result;
} else return -1;
}
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) {
vfs = vfs_get_class (path);
result = vfs->lstat ? (*vfs->lstat) (vfs, path, buf) : -1;
g_free (path);
if (result == -1)
errno = vfs->name ? ferrno (vfs) : E_NOTSUPP;
return result;
} else return -1;
}
int mc_fstat (int handle, struct stat *buf) {
struct vfs_class *vfs;
int result;
if (handle == -1)
return -1;
vfs = vfs_op (handle);
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. You must g_strdup() whatever this function returns.
*/
static const char *
_vfs_get_cwd (void)
{
char *sys_cwd;
char *trans;
const char *encoding;
char *tmp;
estr_t state;
struct stat my_stat, my_stat2;
trans = vfs_translate_path_n (current_dir); /* add check if NULL */
if (!_vfs_get_class (trans)) {
encoding = vfs_get_encoding (current_dir);
if (encoding == NULL) {
tmp = g_get_current_dir ();
if (tmp != NULL) { /* One of the directories in the path is not readable */
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)
return current_dir;
/* Otherwise check if it is O.K. to use the current_dir */
if (!cd_symlinks || mc_stat (sys_cwd, &my_stat)
|| mc_stat (current_dir, &my_stat2)
|| my_stat.st_ino != my_stat2.st_ino
|| my_stat.st_dev != my_stat2.st_dev) {
g_free (current_dir);
current_dir = sys_cwd;
return sys_cwd;
}/* Otherwise we return current_dir below */
}
}
}
g_free (trans);
return current_dir;
}
static void
vfs_setup_wd (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);
}
/**
* 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, int 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;
int result;
if (fd == -1)
return -1;
vfs = vfs_op (fd);
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 /../
*/
#define ISSLASH(a) (!a || (a == '/'))
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 1 is the current VFS class is local */
int
vfs_current_is_local (void)
{
return (current_vfs->flags & VFSF_LOCAL) != 0;
}
/* Return flags of the VFS class of the given filename */
int
vfs_file_class_flags (const char *filename)
{
struct vfs_class *vfs;
char *fname;
fname = vfs_canon_and_translate (filename);
if (fname != NULL) {
vfs = vfs_get_class (fname);
g_free (fname);
return vfs->flags;
} else return -1;
}
static char *
mc_def_getlocalcopy (const char *filename)
{
char *tmp;
int fdin, fdout, 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;
}
char *
mc_getlocalcopy (const char *pathname)
{
char *result;
char *path;
path = vfs_canon_and_translate (pathname);
if (path != NULL) {
struct vfs_class *vfs = vfs_get_class (path);
result = vfs->getlocalcopy ? (*vfs->getlocalcopy)(vfs, path) :
mc_def_getlocalcopy (path);
g_free (path);
if (!result)
errno = ferrno (vfs);
return result;
} else 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, i;
if (has_changed) {
char buffer[8192];
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, 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;
}
int
mc_ungetlocalcopy (const char *pathname, const char *local, int has_changed)
{
int return_value = 0;
char *path;
path = vfs_canon_and_translate (pathname);
if (path != NULL) {
struct vfs_class *vfs = vfs_get_class (path);
return_value = vfs->ungetlocalcopy ?
(*vfs->ungetlocalcopy)(vfs, path, local, has_changed) :
mc_def_ungetlocalcopy (vfs, path, local, has_changed);
g_free (path);
return return_value;
} else return -1;
}
void
vfs_init (void)
{
/* create the VFS handle array */
vfs_openfiles = g_ptr_array_new ();
vfs_str_buffer = g_string_new("");
/* localfs needs to be the first one */
init_localfs();
/* fallback value for vfs_get_class() */
localfs_class = vfs_list;
init_extfs ();
init_sfs ();
init_tarfs ();
init_cpiofs ();
#ifdef USE_EXT2FSLIB
init_undelfs ();
#endif /* USE_EXT2FSLIB */
#ifdef USE_NETCODE
tcp_init();
init_ftpfs ();
init_fish ();
#ifdef WITH_SMBFS
init_smbfs ();
#endif /* WITH_SMBFS */
#ifdef ENABLE_VFS_MCFS
init_mcfs ();
#endif /* ENABLE_VFS_MCFS */
#endif /* USE_NETCODE */
vfs_setup_wd ();
}
void
vfs_shut (void)
{
struct vfs_class *vfs;
vfs_gc_done ();
g_free (current_dir);
for (vfs = vfs_list; vfs; vfs = vfs->next)
if (vfs->done)
(*vfs->done) (vfs);
g_ptr_array_free (vfs_openfiles, TRUE);
g_string_free (vfs_str_buffer, TRUE);
}
/*
* These ones grab information from the VFS
* and handles them to an upper layer
*/
void
vfs_fill_names (fill_names_f func)
{
struct vfs_class *vfs;
for (vfs=vfs_list; vfs; vfs=vfs->next)
if (vfs->fill_names)
(*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.
*/
static const struct {
const char *name;
size_t name_len;
const char *substitute;
} url_table[] = { {"ftp://", 6, "/#ftp:"},
{"mc://", 5, "/#mc:"},
{"smb://", 6, "/#smb:"},
{"sh://", 5, "/#sh:"},
{"ssh://", 6, "/#sh:"},
{"a:", 2, "/#a"}
};
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);
}
int vfs_file_is_local (const char *filename)
{
return vfs_file_class_flags (filename) & VFSF_LOCAL;
}
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