lib/vfs/mc-vfs/vfs.c

   1 /* Virtual File System switch code
   2    Copyright (C) 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   3    2007 Free Software Foundation, Inc.
   4
   5    Written by: 1995 Miguel de Icaza
   6                1995 Jakub Jelinek
   7                1998 Pavel Machek
   8
   9    This program is free software; you can redistribute it and/or
  10    modify it under the terms of the GNU Library General Public License
  11    as published by the Free Software Foundation; either version 2 of
  12    the License, or (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU Library General Public License for more details.
  18
  19    You should have received a copy of the GNU Library General Public
  20    License along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  22
  23 /**
  24  * \file
  25  * \brief Source: Virtual File System switch code
  26  * \author Miguel de Icaza
  27  * \author Jakub Jelinek
  28  * \author Pavel Machek
  29  * \date 1995, 1998
  30  * \warning funtions like extfs_lstat() have right to destroy any
  31  * strings you pass to them. This is acutally ok as you g_strdup what
  32  * you are passing to them, anyway; still, beware.
  33  *
  34  * Namespace: exports *many* functions with vfs_ prefix; exports
  35  * parse_ls_lga and friends which do not have that prefix.
  36  */
  37
  38 #include <config.h>
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>             /* For atol() */
  42 #include <stdarg.h>
  43 #include <string.h>
  44 #include <errno.h>
  45 #include <sys/types.h>
  46 #include <signal.h>
  47 #include <ctype.h>      /* is_digit() */
  48 #include <fcntl.h>
  49 #include <sys/stat.h>
  50 #include <unistd.h>
  51 #include <dirent.h>
  52
  53 #include "lib/global.h"
  54 #include "lib/strutil.h"
  55
  56 #include "src/wtools.h" /* message() */
  57 #include "src/main.h"   /* print_vfs_message */
  58
  59 #include "utilvfs.h"
  60 #include "gc.h"
  61 #include "vfs.h"
  62 #ifdef USE_NETCODE
  63 #   include "netutil.h"
  64 #endif
  65 #include "ftpfs.h"
  66 #include "mcfs.h"
  67 #include "smbfs.h"
  68 #include "local.h"
  69
  70 #if defined(_AIX) && !defined(NAME_MAX)
  71 #  define NAME_MAX FILENAME_MAX
  72 #endif
  73
  74 /** They keep track of the current directory */
  75 static struct vfs_class *current_vfs;
  76 static char *current_dir;
  77
  78 struct vfs_openfile {
  79     int handle;
  80     struct vfs_class *vclass;
  81     void *fsinfo;
  82 };
  83
  84 struct vfs_dirinfo{
  85     DIR *info;
  86     GIConv converter;
  87 };
  88
  89
  90 static GPtrArray *vfs_openfiles;
  91 static long vfs_free_handle_list = -1;
  92 #define VFS_FIRST_HANDLE 100
  93
  94 static struct vfs_class *localfs_class;
  95 static GString *vfs_str_buffer;
  96
  97 static const char *supported_encodings[] = {
  98     "UTF8",
  99     "UTF-8",
 100     "BIG5",
 101     "ASCII",
 102     "ISO8859",
 103     "ISO-8859",
 104     "ISO_8859",
 105     "KOI8",
 106     "CP852",
 107     "CP866",
 108     "CP125",
 109     NULL
 110 };
 111
 112 /** Create new VFS handle and put it to the list */
 113 static int
 114 vfs_new_handle (struct vfs_class *vclass, void *fsinfo)
 115 {
 116     struct vfs_openfile *h;
 117
 118     h = g_new (struct vfs_openfile, 1);
 119     h->fsinfo = fsinfo;
 120     h->vclass = vclass;
 121
 122     /* Allocate the first free handle */
 123     h->handle = vfs_free_handle_list;
 124     if (h->handle == -1) {
 125         /* No free allocated handles, allocate one */
 126         h->handle = vfs_openfiles->len;
 127         g_ptr_array_add (vfs_openfiles, h);
 128     } else {
 129         vfs_free_handle_list = (long) g_ptr_array_index (vfs_openfiles, vfs_free_handle_list);
 130         g_ptr_array_index (vfs_openfiles, h->handle) = h;
 131     }
 132
 133     h->handle += VFS_FIRST_HANDLE;
 134     return h->handle;
 135 }
 136
 137 /** Find VFS class by file handle */
 138 static struct vfs_class *
 139 vfs_op (int handle)
 140 {
 141     struct vfs_openfile *h;
 142
 143     if (handle < VFS_FIRST_HANDLE ||
 144         (guint)(handle - VFS_FIRST_HANDLE) >= vfs_openfiles->len)
 145         return NULL;
 146
 147     h = (struct vfs_openfile *) g_ptr_array_index (
 148                                 vfs_openfiles, handle - VFS_FIRST_HANDLE);
 149     if (!h)
 150         return NULL;
 151
 152     g_assert (h->handle == handle);
 153
 154     return h->vclass;
 155 }
 156
 157 /** Find private file data by file handle */
 158 static void *
 159 vfs_info (int handle)
 160 {
 161     struct vfs_openfile *h;
 162
 163     if (handle < VFS_FIRST_HANDLE ||
 164         (guint)(handle - VFS_FIRST_HANDLE) >= vfs_openfiles->len)
 165         return NULL;
 166
 167     h = (struct vfs_openfile *) g_ptr_array_index (
 168                                 vfs_openfiles, handle - VFS_FIRST_HANDLE);
 169     if (!h)
 170         return NULL;
 171
 172     g_assert (h->handle == handle);
 173
 174     return h->fsinfo;
 175 }
 176
 177 /** Free open file data for given file handle */
 178 static void
 179 vfs_free_handle (int handle)
 180 {
 181     if (handle < VFS_FIRST_HANDLE ||
 182         (guint)(handle - VFS_FIRST_HANDLE) >= vfs_openfiles->len)
 183         return;
 184
 185     g_ptr_array_index (vfs_openfiles, handle - VFS_FIRST_HANDLE) =
 186                         (void *) vfs_free_handle_list;
 187     vfs_free_handle_list = handle - VFS_FIRST_HANDLE;
 188 }
 189
 190 static struct vfs_class *vfs_list;
 191
 192 int
 193 vfs_register_class (struct vfs_class *vfs)
 194 {
 195     if (vfs->init)              /* vfs has own initialization function */
 196         if (!(*vfs->init)(vfs)) /* but it failed */
 197             return 0;
 198
 199     vfs->next = vfs_list;
 200     vfs_list = vfs;
 201
 202     return 1;
 203 }
 204
 205 /** Return VFS class for the given prefix */
 206 static struct vfs_class *
 207 vfs_prefix_to_class (char *prefix)
 208 {
 209     struct vfs_class *vfs;
 210
 211     /* Avoid last class (localfs) that would accept any prefix */
 212     for (vfs = vfs_list; vfs->next; vfs = vfs->next) {
 213         if (vfs->which) {
 214             if ((*vfs->which) (vfs, prefix) == -1)
 215                 continue;
 216             return vfs;
 217         }
 218         if (vfs->prefix
 219             && !strncmp (prefix, vfs->prefix, strlen (vfs->prefix)))
 220             return vfs;
 221     }
 222     return NULL;
 223 }
 224
 225 /** Strip known vfs suffixes from a filename (possible improvement: strip
 226  *  suffix from last path component).
 227  *  \return a malloced string which has to be freed.
 228  */
 229 char *
 230 vfs_strip_suffix_from_filename (const char *filename)
 231 {
 232     struct vfs_class *vfs;
 233     char *semi;
 234     char *p;
 235
 236     if (!filename)
 237         vfs_die ("vfs_strip_suffix_from_path got NULL: impossible");
 238
 239     p = g_strdup (filename);
 240     if (!(semi = strrchr (p, '#')))
 241         return p;
 242
 243     /* Avoid last class (localfs) that would accept any prefix */
 244     for (vfs = vfs_list; vfs->next; vfs = vfs->next) {
 245         if (vfs->which) {
 246             if ((*vfs->which) (vfs, semi + 1) == -1)
 247                 continue;
 248             *semi = '\0';       /* Found valid suffix */
 249             return p;
 250         }
 251         if (vfs->prefix
 252             && !strncmp (semi + 1, vfs->prefix, strlen (vfs->prefix))) {
 253             *semi = '\0';       /* Found valid suffix */
 254             return p;
 255         }
 256     }
 257     return p;
 258 }
 259
 260 static int
 261 path_magic (const char *path)
 262 {
 263     struct stat buf;
 264
 265     if (!stat(path, &buf))
 266         return 0;
 267
 268     return 1;
 269 }
 270
 271 /**
 272  * Splits path extracting vfs part.
 273  *
 274  * Splits path
 275  * \verbatim /p1#op/inpath \endverbatim
 276  * into
 277  * \verbatim inpath,op; \endverbatim
 278  * returns which vfs it is.
 279  * What is left in path is p1. You still want to g_free(path), you DON'T
 280  * want to free neither *inpath nor *op
 281  */
 282 struct vfs_class *
 283 vfs_split (char *path, char **inpath, char **op)
 284 {
 285     char *semi;
 286     char *slash;
 287     struct vfs_class *ret;
 288
 289     if (!path)
 290         vfs_die("Cannot split NULL");
 291
 292     semi = strrchr (path, '#');
 293     if (!semi || !path_magic(path))
 294         return NULL;
 295
 296     slash = strchr (semi, PATH_SEP);
 297     *semi = 0;
 298
 299     if (op)
 300         *op = NULL;
 301
 302     if (inpath)
 303         *inpath = NULL;
 304
 305     if (slash)
 306         *slash = 0;
 307
 308     if ((ret = vfs_prefix_to_class (semi+1))){
 309         if (op)
 310             *op = semi + 1;
 311         if (inpath)
 312             *inpath = slash ? slash + 1 : NULL;
 313         return ret;
 314     }
 315
 316
 317     if (slash)
 318         *slash = PATH_SEP;
 319     ret = vfs_split (path, inpath, op);
 320     *semi = '#';
 321     return ret;
 322 }
 323
 324 static struct vfs_class *
 325 _vfs_get_class (char *path)
 326 {
 327     char *semi;
 328     char *slash;
 329     struct vfs_class *ret;
 330
 331     g_return_val_if_fail(path, NULL);
 332
 333     semi = strrchr (path, '#');
 334     if (!semi || !path_magic (path))
 335         return NULL;
 336
 337     slash = strchr (semi, PATH_SEP);
 338     *semi = 0;
 339     if (slash)
 340         *slash = 0;
 341
 342     ret = vfs_prefix_to_class (semi+1);
 343
 344     if (slash)
 345         *slash = PATH_SEP;
 346     if (!ret)
 347         ret = _vfs_get_class (path);
 348
 349     *semi = '#';
 350     return ret;
 351 }
 352
 353 struct vfs_class *
 354 vfs_get_class (const char *pathname)
 355 {
 356     struct vfs_class *vfs;
 357     char *path = g_strdup (pathname);
 358
 359     vfs = _vfs_get_class (path);
 360     g_free (path);
 361
 362     if (!vfs)
 363         vfs = localfs_class;
 364
 365     return vfs;
 366 }
 367
 368 const char *
 369 vfs_get_encoding (const char *path)
 370 {
 371     static char result[16];
 372     char *work;
 373     char *semi;
 374     char *slash;
 375
 376     work = g_strdup (path);
 377     semi = g_strrstr (work, "#enc:");
 378
 379     if (semi != NULL) {
 380         semi+= 5 * sizeof (char);
 381         slash = strchr (semi, PATH_SEP);
 382         if (slash != NULL)
 383             slash[0] = '\0';
 384
 385         g_strlcpy (result, semi, sizeof(result));
 386         g_free (work);
 387         return result;
 388     }  else {
 389         g_free (work);
 390         return NULL;
 391     }
 392 }
 393
 394 /* return if encoding can by used in vfs (is ascci full compactible) */
 395 /* contains only a few encoding now */
 396 static int
 397 vfs_supported_enconding (const char *encoding) {
 398     int t;
 399     int result = 0;
 400
 401     for (t = 0; supported_encodings[t] != NULL; t++) {
 402         result+= (g_ascii_strncasecmp (encoding, supported_encodings[t],
 403                   strlen (supported_encodings[t])) == 0);
 404     }
 405
 406     return result;
 407 }
 408
 409 /* now used only by vfs_translate_path, but could be used in other vfs
 410  * plugin to automatic detect encoding
 411  * path - path to translate
 412  * size - how many bytes from path translate
 413  * defcnv - convertor, that is used as default, when path does not contain any
 414  *          #enc: subtring
 415  * buffer - used to store result of translation
 416  */
 417 static estr_t
 418 _vfs_translate_path (const char *path, int size,
 419                      GIConv defcnv, GString *buffer)
 420 {
 421     const char *semi;
 422     const char *ps;
 423     const char *slash;
 424     estr_t state = ESTR_SUCCESS;
 425     static char encoding[16];
 426     GIConv coder;
 427     int ms;
 428
 429     if (size == 0) return 0;
 430     size = ( size > 0) ? size : (signed int)strlen (path);
 431
 432     /* try found #end: */
 433     semi = g_strrstr_len (path, size, "#enc:");
 434     if (semi != NULL) {
 435         /* first must be translated part before #enc: */
 436         ms = semi - path;
 437
 438         /* remove '/' before #enc */
 439         ps = str_cget_prev_char (semi);
 440         if (ps[0] == PATH_SEP) ms = ps - path;
 441
 442         state = _vfs_translate_path (path, ms, defcnv, buffer);
 443
 444         if (state != ESTR_SUCCESS)
 445             return state;
 446         /* now can be translated part after #enc: */
 447
 448         semi+= 5;
 449         slash = strchr (semi, PATH_SEP);
 450         /* ignore slashes after size; */
 451         if (slash - path >= size) slash = NULL;
 452
 453         ms = (slash != NULL) ? slash - semi : (int) strlen (semi);
 454         ms = min ((unsigned int) ms, sizeof (encoding) - 1);
 455         /* limit encoding size (ms) to path size (size) */
 456         if (semi + ms > path + size) ms = path + size - semi;
 457         memcpy (encoding, semi, ms);
 458         encoding[ms] = '\0';
 459
 460         switch (vfs_supported_enconding (encoding)) {
 461             case 1:
 462                 coder = str_crt_conv_to (encoding);
 463                 if (coder != INVALID_CONV)  {
 464                     if (slash != NULL) {
 465                         state = str_vfs_convert_to (coder, slash,
 466                                 path + size - slash, buffer);
 467                     } else if (buffer->str[0] == '\0') {
 468                         /* exmaple "/#enc:utf-8" */
 469                         g_string_append_c(buffer, PATH_SEP);
 470                     }
 471                     str_close_conv (coder);
 472                     return state;
 473                 } else {
 474                     errno = EINVAL;
 475                     return ESTR_FAILURE;
 476                 }
 477                 break;
 478             default:
 479                 errno = EINVAL;
 480                 return ESTR_FAILURE;
 481         }
 482     } else {
 483         /* path can be translated whole at once */
 484         state = str_vfs_convert_to (defcnv, path, size, buffer);
 485         return state;
 486     }
 487
 488     return ESTR_SUCCESS;
 489 }
 490
 491 char *
 492 vfs_translate_path (const char *path)
 493 {
 494     estr_t state;
 495
 496     g_string_set_size(vfs_str_buffer,0);
 497     state = _vfs_translate_path (path, -1, str_cnv_from_term, vfs_str_buffer);
 498     /*
 499      strict version
 500      return (state == 0) ? vfs_str_buffer->data : NULL;
 501     */
 502     return (state != ESTR_FAILURE) ? vfs_str_buffer->str : NULL;
 503 }
 504
 505 char *
 506 vfs_translate_path_n (const char *path)
 507 {
 508     char *result;
 509
 510     result = vfs_translate_path (path);
 511     return (result != NULL) ? g_strdup (result) : NULL;
 512 }
 513
 514 char *
 515 vfs_canon_and_translate (const char *path)
 516 {
 517     char *canon;
 518     char *result;
 519     if (path == NULL)
 520         canon = g_strdup ("");
 521     else
 522         canon = vfs_canon (path);
 523     result = vfs_translate_path_n (canon);
 524     g_free (canon);
 525     return result;
 526 }
 527
 528 static int
 529 ferrno (struct vfs_class *vfs)
 530 {
 531     return vfs->ferrno ? (*vfs->ferrno)(vfs) : E_UNKNOWN;
 532     /* Hope that error message is obscure enough ;-) */
 533 }
 534
 535 int
 536 mc_open (const char *filename, int flags, ...)
 537 {
 538     int  mode;
 539     void *info;
 540     va_list ap;
 541
 542     char *file = vfs_canon_and_translate (filename);
 543     if (file != NULL) {
 544     struct vfs_class *vfs = vfs_get_class (file);
 545
 546     /* Get the mode flag */
 547     if (flags & O_CREAT) {
 548         va_start (ap, flags);
 549         mode = va_arg (ap, int);
 550         va_end (ap);
 551     } else
 552         mode = 0;
 553
 554     if (!vfs->open) {
 555         g_free (file);
 556         errno = -EOPNOTSUPP;
 557         return -1;
 558     }
 559
 560     info = (*vfs->open) (vfs, file, flags, mode);       /* open must be supported */
 561     g_free (file);
 562     if (!info){
 563         errno = ferrno (vfs);
 564         return -1;
 565     }
 566
 567     return vfs_new_handle (vfs, info);
 568     } else return -1;
 569 }
 570
 571
 572 #define MC_NAMEOP(name, inarg, callarg) \
 573 int mc_##name inarg \
 574 { \
 575     struct vfs_class *vfs; \
 576     int result; \
 577     char *mpath = vfs_canon_and_translate (path); \
 578     if (mpath != NULL) { \
 579     vfs = vfs_get_class (mpath); \
 580     if (vfs == NULL){ \
 581         g_free (mpath); \
 582         return -1; \
 583     } \
 584     result = vfs->name ? (*vfs->name)callarg : -1; \
 585     g_free (mpath); \
 586     if (result == -1) \
 587         errno = vfs->name ? ferrno (vfs) : E_NOTSUPP; \
 588     return result; \
 589     } else return -1; \
 590 }
 591
 592 MC_NAMEOP (chmod, (const char *path, mode_t mode), (vfs, mpath, mode))
 593 MC_NAMEOP (chown, (const char *path, uid_t owner, gid_t group), (vfs, mpath, owner, group))
 594 MC_NAMEOP (utime, (const char *path, struct utimbuf *times), (vfs, mpath, times))
 595 MC_NAMEOP (readlink, (const char *path, char *buf, int bufsiz), (vfs, mpath, buf, bufsiz))
 596 MC_NAMEOP (unlink, (const char *path), (vfs, mpath))
 597 MC_NAMEOP (mkdir, (const char *path, mode_t mode), (vfs, mpath, mode))
 598 MC_NAMEOP (rmdir, (const char *path), (vfs, mpath))
 599 MC_NAMEOP (mknod, (const char *path, mode_t mode, dev_t dev), (vfs, mpath, mode, dev))
 600
 601 int
 602 mc_symlink (const char *name1, const char *path)
 603 {
 604     struct vfs_class *vfs;
 605     int result;
 606     char *mpath;
 607     char *lpath;
 608     char *tmp;
 609
 610     mpath = vfs_canon_and_translate (path);
 611     if (mpath != NULL) {
 612         tmp = g_strdup (name1);
 613         lpath = vfs_translate_path_n (tmp);
 614         g_free (tmp);
 615
 616         if (lpath != NULL) {
 617             vfs = vfs_get_class (mpath);
 618             result = vfs->symlink ? (*vfs->symlink) (vfs, lpath, mpath) : -1;
 619             g_free (lpath);
 620             g_free (mpath);
 621
 622             if (result == -1)
 623                 errno = vfs->symlink ? ferrno (vfs) : E_NOTSUPP;
 624             return result;
 625         }
 626         g_free (mpath);
 627     }
 628     return -1;
 629 }
 630
 631 #define MC_HANDLEOP(name, inarg, callarg) \
 632 ssize_t mc_##name inarg \
 633 { \
 634     struct vfs_class *vfs; \
 635     int result; \
 636     if (handle == -1) \
 637         return -1; \
 638     vfs = vfs_op (handle); \
 639     if (vfs == NULL) \
 640          return -1; \
 641     result = vfs->name ? (*vfs->name)callarg : -1; \
 642     if (result == -1) \
 643         errno = vfs->name ? ferrno (vfs) : E_NOTSUPP; \
 644     return result; \
 645 }
 646
 647 MC_HANDLEOP(read,  (int handle, void *buffer,    int count), (vfs_info (handle), buffer, count))
 648 MC_HANDLEOP(write, (int handle, const void *buf, int nbyte), (vfs_info (handle), buf,    nbyte))
 649
 650
 651 #define MC_RENAMEOP(name) \
 652 int mc_##name (const char *fname1, const char *fname2) \
 653 { \
 654     struct vfs_class *vfs; \
 655     int result; \
 656     char *name2, *name1; \
 657     name1 = vfs_canon_and_translate (fname1); \
 658     if (name1 != NULL) { \
 659         name2 = vfs_canon_and_translate (fname2); \
 660         if (name2 != NULL) { \
 661     vfs = vfs_get_class (name1); \
 662     if (vfs != vfs_get_class (name2)){ \
 663         errno = EXDEV; \
 664         g_free (name1); \
 665         g_free (name2); \
 666         return -1; \
 667     } \
 668     result = vfs->name ? (*vfs->name)(vfs, name1, name2) : -1; \
 669     g_free (name1); \
 670     g_free (name2); \
 671     if (result == -1) \
 672         errno = vfs->name ? ferrno (vfs) : E_NOTSUPP; \
 673     return result; \
 674     } else { \
 675         g_free (name1); \
 676         return -1; \
 677     } \
 678     } else return -1; \
 679 }
 680
 681 MC_RENAMEOP (link)
 682 MC_RENAMEOP (rename)
 683
 684
 685 int
 686 mc_ctl (int handle, int ctlop, void *arg)
 687 {
 688     struct vfs_class *vfs = vfs_op (handle);
 689
 690     if (vfs == NULL)
 691         return 0;
 692
 693     return vfs->ctl ? (*vfs->ctl)(vfs_info (handle), ctlop, arg) : 0;
 694 }
 695
 696 int
 697 mc_setctl (const char *path, int ctlop, void *arg)
 698 {
 699     struct vfs_class *vfs;
 700     int result;
 701     char *mpath;
 702
 703     if (!path)
 704         vfs_die("You don't want to pass NULL to mc_setctl.");
 705
 706     mpath = vfs_canon_and_translate (path);
 707     if (mpath != NULL) {
 708     vfs = vfs_get_class (mpath);
 709     result = vfs->setctl ? (*vfs->setctl)(vfs, mpath, ctlop, arg) : 0;
 710     g_free (mpath);
 711     return result;
 712     } else return -1;
 713 }
 714
 715 int
 716 mc_close (int handle)
 717 {
 718     struct vfs_class *vfs;
 719     int result;
 720
 721     if (handle == -1 || !vfs_info (handle))
 722         return -1;
 723
 724     vfs = vfs_op (handle);
 725     if (vfs == NULL)
 726         return -1;
 727
 728     if (handle < 3)
 729         return close (handle);
 730
 731     if (!vfs->close)
 732         vfs_die ("VFS must support close.\n");
 733     result = (*vfs->close)(vfs_info (handle));
 734     vfs_free_handle (handle);
 735     if (result == -1)
 736         errno = ferrno (vfs);
 737
 738     return result;
 739 }
 740
 741 DIR *
 742 mc_opendir (const char *dirname)
 743 {
 744     int  handle, *handlep;
 745     void *info;
 746     struct vfs_class *vfs;
 747     char *canon;
 748     char *dname;
 749     struct vfs_dirinfo *dirinfo;
 750     const char *encoding;
 751
 752     canon = vfs_canon (dirname);
 753     dname = vfs_translate_path_n (canon);
 754
 755     if (dname != NULL) {
 756         vfs = vfs_get_class (dname);
 757         info = vfs->opendir ? (*vfs->opendir)(vfs, dname) : NULL;
 758         g_free (dname);
 759
 760         if (info == NULL) {
 761             errno = vfs->opendir ? ferrno (vfs) : E_NOTSUPP;
 762             g_free (canon);
 763             return NULL;
 764         }
 765
 766         dirinfo = g_new (struct vfs_dirinfo, 1);
 767         dirinfo->info = info;
 768
 769         encoding = vfs_get_encoding (canon);
 770         g_free (canon);
 771         dirinfo->converter = (encoding != NULL) ? str_crt_conv_from (encoding) :
 772                 str_cnv_from_term;
 773         if (dirinfo->converter == INVALID_CONV) dirinfo->converter =str_cnv_from_term;
 774
 775         handle = vfs_new_handle (vfs, dirinfo);
 776
 777         handlep = g_new (int, 1);
 778         *handlep = handle;
 779         return (DIR *) handlep;
 780     } else {
 781         g_free (canon);
 782         return NULL;
 783     }
 784 }
 785
 786 static struct dirent * mc_readdir_result = NULL;
 787
 788 struct dirent *
 789 mc_readdir (DIR *dirp)
 790 {
 791     int handle;
 792     struct vfs_class *vfs;
 793     struct dirent *entry = NULL;
 794     struct vfs_dirinfo *dirinfo;
 795     estr_t state;
 796
 797     if (!mc_readdir_result)
 798     {
 799         /* We can't just allocate struct dirent as (see man dirent.h)
 800          * struct dirent has VERY nonnaive semantics of allocating
 801          * d_name in it. Moreover, linux's glibc-2.9 allocates dirents _less_,
 802          * than 'sizeof (struct dirent)' making full bitwise (sizeof dirent) copy
 803          * heap corrupter. So, allocate longliving dirent with at least
 804          * (MAXNAMLEN + 1) for d_name in it.
 805          * Strictly saying resulting dirent is unusable as we don't adjust internal
 806          * structures, holding dirent size. But we don't use it in libc infrastructure.
 807          * TODO: to make simpler homemade dirent-alike structure.
 808          */
 809         mc_readdir_result = (struct dirent *) g_malloc (sizeof(struct dirent) + MAXNAMLEN + 1);
 810     }
 811
 812     if (!dirp) {
 813         errno = EFAULT;
 814         return NULL;
 815     }
 816     handle = *(int *) dirp;
 817
 818     vfs = vfs_op (handle);
 819     if (vfs == NULL)
 820         return NULL;
 821
 822     dirinfo = vfs_info (handle);
 823     if (vfs->readdir) {
 824         entry = (*vfs->readdir) (dirinfo->info);
 825         if (entry == NULL) return NULL;
 826         g_string_set_size(vfs_str_buffer,0);
 827         state = str_vfs_convert_from (dirinfo->converter,
 828                                           entry->d_name, vfs_str_buffer);
 829         mc_readdir_result->d_ino = entry->d_ino;
 830         g_strlcpy (mc_readdir_result->d_name, vfs_str_buffer->str, MAXNAMLEN + 1);
 831     }
 832     if (entry == NULL) errno = vfs->readdir ? ferrno (vfs) : E_NOTSUPP;
 833     return (entry != NULL) ? mc_readdir_result : NULL;
 834 }
 835
 836 int
 837 mc_closedir (DIR *dirp)
 838 {
 839     int handle = *(int *) dirp;
 840     struct vfs_class *vfs = vfs_op (handle);
 841     int result;
 842     struct vfs_dirinfo *dirinfo;
 843
 844     if (vfs == NULL)
 845         return -1;
 846
 847     dirinfo = vfs_info (handle);
 848     if (dirinfo->converter != str_cnv_from_term) str_close_conv (dirinfo->converter);
 849
 850     result = vfs->closedir ? (*vfs->closedir)(dirinfo->info) : -1;
 851     vfs_free_handle (handle);
 852     g_free (dirinfo);
 853     g_free (dirp);
 854     return result;
 855 }
 856
 857 int mc_stat (const char *filename, struct stat *buf) {
 858     struct vfs_class *vfs;
 859     int result;
 860     char *path;
 861
 862     path = vfs_canon_and_translate (filename);
 863
 864     if (path == NULL)
 865         return -1;
 866
 867     vfs = vfs_get_class (path);
 868
 869     if (vfs == NULL) {
 870         g_free (path);
 871         return -1;
 872     }
 873
 874     result = vfs->stat ? (*vfs->stat) (vfs, path, buf) : -1;
 875
 876     g_free (path);
 877
 878     if (result == -1)
 879         errno = vfs->name ? ferrno (vfs) : E_NOTSUPP;
 880     return result;
 881 }
 882
 883 int mc_lstat (const char *filename, struct stat *buf) {
 884     struct vfs_class *vfs;
 885     int result;
 886     char *path;
 887
 888     path = vfs_canon_and_translate (filename);
 889
 890     if (path == NULL)
 891         return -1;
 892
 893     vfs = vfs_get_class (path);
 894     if (vfs == NULL) {
 895         g_free (path);
 896         return -1;
 897     }
 898
 899     result = vfs->lstat ? (*vfs->lstat) (vfs, path, buf) : -1;
 900     g_free (path);
 901     if (result == -1)
 902         errno = vfs->name ? ferrno (vfs) : E_NOTSUPP;
 903     return result;
 904 }
 905
 906 int mc_fstat (int handle, struct stat *buf) {
 907     struct vfs_class *vfs;
 908     int result;
 909
 910     if (handle == -1)
 911         return -1;
 912
 913     vfs = vfs_op (handle);
 914     if (vfs == NULL)
 915         return -1;
 916
 917     result = vfs->fstat ? (*vfs->fstat) (vfs_info (handle), buf) : -1;
 918     if (result == -1)
 919         errno = vfs->name ? ferrno (vfs) : E_NOTSUPP;
 920     return result;
 921 }
 922
 923 /**
 924  * Return current directory.  If it's local, reread the current directory
 925  * from the OS.  You must g_strdup() whatever this function returns.
 926  */
 927 static const char *
 928 _vfs_get_cwd (void)
 929 {
 930     char *trans;
 931
 932     trans = vfs_translate_path_n (current_dir);
 933
 934     if (_vfs_get_class (trans) == NULL) {
 935         const char *encoding = vfs_get_encoding (current_dir);
 936
 937         if (encoding == NULL) {
 938             char *tmp;
 939
 940             tmp = g_get_current_dir ();
 941             if (tmp != NULL) { /* One of the directories in the path is not readable */
 942                 estr_t state;
 943                 char *sys_cwd;
 944
 945                 g_string_set_size (vfs_str_buffer, 0);
 946                 state = str_vfs_convert_from (str_cnv_from_term, tmp, vfs_str_buffer);
 947                 g_free (tmp);
 948
 949                 sys_cwd = (state == ESTR_SUCCESS) ? g_strdup (vfs_str_buffer->str) : NULL;
 950                 if (sys_cwd != NULL) {
 951                     struct stat my_stat, my_stat2;
 952                     /* Check if it is O.K. to use the current_dir */
 953                     if (cd_symlinks
 954                         && mc_stat (sys_cwd, &my_stat) == 0
 955                         && mc_stat (current_dir, &my_stat2) == 0
 956                         && my_stat.st_ino == my_stat2.st_ino
 957                         && my_stat.st_dev == my_stat2.st_dev)
 958                         g_free (sys_cwd);
 959                     else {
 960                         g_free (current_dir);
 961                         current_dir = sys_cwd;
 962                     }
 963                 }
 964             }
 965         }
 966     }
 967
 968     g_free (trans);
 969     return current_dir;
 970 }
 971
 972 static void
 973 vfs_setup_wd (void)
 974 {
 975     current_dir = g_strdup (PATH_SEP_STR);
 976     _vfs_get_cwd ();
 977
 978     if (strlen (current_dir) > MC_MAXPATHLEN - 2)
 979         vfs_die ("Current dir too long.\n");
 980
 981     current_vfs = vfs_get_class (current_dir);
 982 }
 983
 984 /**
 985  * Return current directory. If it's local, reread the current directory
 986  * from the OS. Put directory to the provided buffer.
 987  */
 988 char *
 989 mc_get_current_wd (char *buffer, int size)
 990 {
 991     const char *cwd = _vfs_get_cwd ();
 992
 993     g_strlcpy (buffer, cwd, size);
 994     return buffer;
 995 }
 996
 997 /**
 998  * Return current directory without any OS calls.
 999  */
1000 char *
1001 vfs_get_current_dir (void)
1002 {
1003     return current_dir;
1004 }
1005
1006 off_t mc_lseek (int fd, off_t offset, int whence)
1007 {
1008     struct vfs_class *vfs;
1009     int result;
1010
1011     if (fd == -1)
1012         return -1;
1013
1014     vfs = vfs_op (fd);
1015     if (vfs == NULL)
1016         return -1;
1017
1018     result = vfs->lseek ? (*vfs->lseek)(vfs_info (fd), offset, whence) : -1;
1019     if (result == -1)
1020         errno = vfs->lseek ? ferrno (vfs) : E_NOTSUPP;
1021     return result;
1022 }
1023
1024 /**
1025  * remove //, /./ and /../
1026  */
1027
1028 #define ISSLASH(a) (!a || (a == '/'))
1029
1030 char *
1031 vfs_canon (const char *path)
1032 {
1033     if (!path)
1034         vfs_die("Cannot canonicalize NULL");
1035
1036     /* Relative to current directory */
1037     if (*path != PATH_SEP){
1038         char *local, *result;
1039
1040         local = concat_dir_and_file (current_dir, path);
1041
1042         result = vfs_canon (local);
1043         g_free (local);
1044         return result;
1045     }
1046
1047     /*
1048      * So we have path of following form:
1049      * /p1/p2#op/.././././p3#op/p4. Good luck.
1050      */
1051     {
1052         char *result = g_strdup (path);
1053         canonicalize_pathname (result);
1054         return result;
1055     }
1056 }
1057
1058 /**
1059  * VFS chdir.
1060  * Return 0 on success, -1 on failure.
1061  */
1062 int
1063 mc_chdir (const char *path)
1064 {
1065     char *new_dir;
1066     char *trans_dir;
1067     struct vfs_class *old_vfs, *new_vfs;
1068     vfsid old_vfsid;
1069     int result;
1070
1071     new_dir = vfs_canon (path);
1072     trans_dir = vfs_translate_path_n (new_dir);
1073     if (trans_dir != NULL) {
1074         new_vfs = vfs_get_class (trans_dir);
1075     if (!new_vfs->chdir) {
1076         g_free (new_dir);
1077             g_free (trans_dir);
1078         return -1;
1079     }
1080
1081         result = (*new_vfs->chdir) (new_vfs, trans_dir);
1082
1083     if (result == -1) {
1084         errno = ferrno (new_vfs);
1085         g_free (new_dir);
1086             g_free (trans_dir);
1087         return -1;
1088     }
1089
1090     old_vfsid = vfs_getid (current_vfs, current_dir);
1091     old_vfs = current_vfs;
1092
1093     /* Actually change directory */
1094     g_free (current_dir);
1095     current_dir = new_dir;
1096     current_vfs = new_vfs;
1097
1098     /* This function uses the new current_dir implicitly */
1099     vfs_stamp_create (old_vfs, old_vfsid);
1100
1101     /* Sometimes we assume no trailing slash on cwd */
1102     if (*current_dir) {
1103         char *p;
1104         p = strchr (current_dir, 0) - 1;
1105         if (*p == PATH_SEP && p > current_dir)
1106             *p = 0;
1107     }
1108
1109         g_free (trans_dir);
1110     return 0;
1111     } else {
1112         g_free (new_dir);
1113         return -1;
1114     }
1115 }
1116
1117 /* Return 1 is the current VFS class is local */
1118 int
1119 vfs_current_is_local (void)
1120 {
1121     return (current_vfs->flags & VFSF_LOCAL) != 0;
1122 }
1123
1124 /* Return flags of the VFS class of the given filename */
1125 int
1126 vfs_file_class_flags (const char *filename)
1127 {
1128     struct vfs_class *vfs;
1129     char *fname;
1130
1131     fname = vfs_canon_and_translate (filename);
1132     if (fname != NULL) {
1133     vfs = vfs_get_class (fname);
1134     g_free (fname);
1135     return vfs->flags;
1136     } else return -1;
1137 }
1138
1139 static char *
1140 mc_def_getlocalcopy (const char *filename)
1141 {
1142     char *tmp;
1143     int fdin, fdout;
1144     ssize_t i;
1145     char buffer[8192];
1146     struct stat mystat;
1147
1148     fdin = mc_open (filename, O_RDONLY | O_LINEAR);
1149     if (fdin == -1)
1150         return NULL;
1151
1152     fdout = vfs_mkstemps (&tmp, "vfs", filename);
1153
1154     if (fdout == -1)
1155         goto fail;
1156     while ((i = mc_read (fdin, buffer, sizeof (buffer))) > 0) {
1157         if (write (fdout, buffer, i) != i)
1158             goto fail;
1159     }
1160     if (i == -1)
1161         goto fail;
1162     i = mc_close (fdin);
1163     fdin = -1;
1164     if (i == -1)
1165         goto fail;
1166     if (close (fdout) == -1) {
1167         fdout = -1;
1168         goto fail;
1169     }
1170
1171     if (mc_stat (filename, &mystat) != -1) {
1172         chmod (tmp, mystat.st_mode);
1173     }
1174     return tmp;
1175
1176   fail:
1177     if (fdout != -1)
1178         close (fdout);
1179     if (fdin != -1)
1180         mc_close (fdin);
1181     g_free (tmp);
1182     return NULL;
1183 }
1184
1185 char *
1186 mc_getlocalcopy (const char *pathname)
1187 {
1188     char *result;
1189     char *path;
1190
1191     path = vfs_canon_and_translate (pathname);
1192     if (path != NULL) {
1193     struct vfs_class *vfs = vfs_get_class (path);
1194
1195     result = vfs->getlocalcopy ? (*vfs->getlocalcopy)(vfs, path) :
1196                                  mc_def_getlocalcopy (path);
1197     g_free (path);
1198     if (!result)
1199         errno = ferrno (vfs);
1200     return result;
1201     } else return NULL;
1202 }
1203
1204 static int
1205 mc_def_ungetlocalcopy (struct vfs_class *vfs, const char *filename,
1206                        const char *local, int has_changed)
1207 {
1208     int fdin = -1, fdout = -1, i;
1209     if (has_changed) {
1210         char buffer[8192];
1211
1212         if (!vfs->write)
1213             goto failed;
1214
1215         fdin = open (local, O_RDONLY);
1216         if (fdin == -1)
1217             goto failed;
1218         fdout = mc_open (filename, O_WRONLY | O_TRUNC);
1219         if (fdout == -1)
1220             goto failed;
1221         while ((i = read (fdin, buffer, sizeof (buffer))) > 0) {
1222             if (mc_write (fdout, buffer, i) != i)
1223                 goto failed;
1224         }
1225         if (i == -1)
1226             goto failed;
1227
1228         if (close (fdin) == -1) {
1229             fdin = -1;
1230             goto failed;
1231         }
1232         fdin = -1;
1233         if (mc_close (fdout) == -1) {
1234             fdout = -1;
1235             goto failed;
1236         }
1237     }
1238     unlink (local);
1239     return 0;
1240
1241   failed:
1242     message (D_ERROR, _("Changes to file lost"), "%s", filename);
1243     if (fdout != -1)
1244         mc_close (fdout);
1245     if (fdin != -1)
1246         close (fdin);
1247     unlink (local);
1248     return -1;
1249 }
1250
1251 int
1252 mc_ungetlocalcopy (const char *pathname, const char *local, int has_changed)
1253 {
1254     int return_value = 0;
1255     char *path;
1256
1257     path = vfs_canon_and_translate (pathname);
1258     if (path != NULL) {
1259     struct vfs_class *vfs = vfs_get_class (path);
1260
1261     return_value = vfs->ungetlocalcopy ?
1262             (*vfs->ungetlocalcopy)(vfs, path, local, has_changed) :
1263             mc_def_ungetlocalcopy (vfs, path, local, has_changed);
1264     g_free (path);
1265     return return_value;
1266     } else return -1;
1267 }
1268
1269
1270 void
1271 vfs_init (void)
1272 {
1273     /* create the VFS handle array */
1274     vfs_openfiles = g_ptr_array_new ();
1275
1276     vfs_str_buffer = g_string_new("");
1277     /* localfs needs to be the first one */
1278     init_localfs();
1279     /* fallback value for vfs_get_class() */
1280     localfs_class = vfs_list;
1281
1282     init_extfs ();
1283     init_sfs ();
1284     init_tarfs ();
1285     init_cpiofs ();
1286
1287 #ifdef USE_EXT2FSLIB
1288     init_undelfs ();
1289 #endif /* USE_EXT2FSLIB */
1290
1291 #ifdef USE_NETCODE
1292     init_ftpfs ();
1293     init_fish ();
1294 #ifdef ENABLE_VFS_SMB
1295     init_smbfs ();
1296 #endif /* ENABLE_VFS_SMB */
1297 #ifdef ENABLE_VFS_MCFS
1298     init_mcfs ();
1299 #endif /* ENABLE_VFS_MCFS */
1300 #endif /* USE_NETCODE */
1301
1302     vfs_setup_wd ();
1303 }
1304
1305 void
1306 vfs_shut (void)
1307 {
1308     struct vfs_class *vfs;
1309
1310     vfs_gc_done ();
1311
1312     g_free (current_dir);
1313
1314     for (vfs = vfs_list; vfs; vfs = vfs->next)
1315         if (vfs->done)
1316             (*vfs->done) (vfs);
1317
1318     g_ptr_array_free (vfs_openfiles, TRUE);
1319     g_string_free (vfs_str_buffer, TRUE);
1320     g_free (mc_readdir_result);
1321 }
1322
1323 /*
1324  * These ones grab information from the VFS
1325  *  and handles them to an upper layer
1326  */
1327 void
1328 vfs_fill_names (fill_names_f func)
1329 {
1330     struct vfs_class *vfs;
1331
1332     for (vfs=vfs_list; vfs; vfs=vfs->next)
1333         if (vfs->fill_names)
1334             (*vfs->fill_names) (vfs, func);
1335 }
1336
1337 /*
1338  * Returns vfs path corresponding to given url. If passed string is
1339  * not recognized as url, g_strdup(url) is returned.
1340  */
1341
1342 static const struct {
1343     const char *name;
1344     size_t name_len;
1345     const char *substitute;
1346 } url_table[] = { {"ftp://", 6, "/#ftp:"},
1347                   {"mc://", 5, "/#mc:"},
1348                   {"smb://", 6, "/#smb:"},
1349                   {"sh://", 5, "/#sh:"},
1350                   {"ssh://", 6, "/#sh:"},
1351                   {"a:", 2, "/#a"}
1352 };
1353
1354 char *
1355 vfs_translate_url (const char *url)
1356 {
1357     size_t i;
1358
1359     for (i = 0; i < sizeof (url_table)/sizeof (url_table[0]); i++)
1360        if (strncmp (url, url_table[i].name, url_table[i].name_len) == 0)
1361            return g_strconcat (url_table[i].substitute, url + url_table[i].name_len, (char*) NULL);
1362
1363     return g_strdup (url);
1364 }
1365
1366 int vfs_file_is_local (const char *filename)
1367 {
1368     return vfs_file_class_flags (filename) & VFSF_LOCAL;
1369 }