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 "../src/global.h"
  54
  55 #include "../src/wtools.h"      /* message() */
  56 #include "../src/main.h"        /* print_vfs_message */
  57 #include "../src/strutil.h"
  58
  59 #include "utilvfs.h"
  60 #include "gc.h"
  61 #include "vfs.h"
  62 #ifdef USE_NETCODE
  63 #   include "tcputil.h"
  64 #endif
  65 #include "ftpfs.h"
  66 #include "mcfs.h"
  67 #include "smbfs.h"
  68 #include "local.h"
  69
  70 /** They keep track of the current directory */
  71 static struct vfs_class *current_vfs;
  72 static char *current_dir;
  73
  74 struct vfs_openfile {
  75     int handle;
  76     struct vfs_class *vclass;
  77     void *fsinfo;
  78 };
  79
  80 struct vfs_dirinfo{
  81     DIR *info;
  82     GIConv converter;
  83 };
  84
  85
  86 static GPtrArray *vfs_openfiles;
  87 static long vfs_free_handle_list = -1;
  88 #define VFS_FIRST_HANDLE 100
  89
  90 static struct vfs_class *localfs_class;
  91 static GString *vfs_str_buffer;
  92
  93 static const char *supported_encodings[] = {
  94     "UTF8",
  95     "UTF-8",
  96     "BIG5",
  97     "ASCII",
  98     "ISO8859",
  99     "ISO-8859",
 100     "ISO_8859",
 101     "KOI8",
 102     "CP852",
 103     "CP866",
 104     "CP125",
 105     NULL
 106 };
 107
 108 /** Create new VFS handle and put it to the list */
 109 static int
 110 vfs_new_handle (struct vfs_class *vclass, void *fsinfo)
 111 {
 112     struct vfs_openfile *h;
 113
 114     h = g_new (struct vfs_openfile, 1);
 115     h->fsinfo = fsinfo;
 116     h->vclass = vclass;
 117
 118     /* Allocate the first free handle */
 119     h->handle = vfs_free_handle_list;
 120     if (h->handle == -1) {
 121         /* No free allocated handles, allocate one */
 122         h->handle = vfs_openfiles->len;
 123         g_ptr_array_add (vfs_openfiles, h);
 124     } else {
 125         vfs_free_handle_list = (long) g_ptr_array_index (vfs_openfiles, vfs_free_handle_list);
 126         g_ptr_array_index (vfs_openfiles, h->handle) = h;
 127     }
 128
 129     h->handle += VFS_FIRST_HANDLE;
 130     return h->handle;
 131 }
 132
 133 /** Find VFS class by file handle */
 134 static struct vfs_class *
 135 vfs_op (int handle)
 136 {
 137     struct vfs_openfile *h;
 138
 139     if (handle < VFS_FIRST_HANDLE ||
 140         (guint)(handle - VFS_FIRST_HANDLE) >= vfs_openfiles->len)
 141         return NULL;
 142
 143     h = (struct vfs_openfile *) g_ptr_array_index (
 144                                 vfs_openfiles, handle - VFS_FIRST_HANDLE);
 145     if (!h)
 146         return NULL;
 147
 148     g_assert (h->handle == handle);
 149
 150     return h->vclass;
 151 }
 152
 153 /** Find private file data by file handle */
 154 static void *
 155 vfs_info (int handle)
 156 {
 157     struct vfs_openfile *h;
 158
 159     if (handle < VFS_FIRST_HANDLE ||
 160         (guint)(handle - VFS_FIRST_HANDLE) >= vfs_openfiles->len)
 161         return NULL;
 162
 163     h = (struct vfs_openfile *) g_ptr_array_index (
 164                                 vfs_openfiles, handle - VFS_FIRST_HANDLE);
 165     if (!h)
 166         return NULL;
 167
 168     g_assert (h->handle == handle);
 169
 170     return h->fsinfo;
 171 }
 172
 173 /** Free open file data for given file handle */
 174 static void
 175 vfs_free_handle (int handle)
 176 {
 177     if (handle < VFS_FIRST_HANDLE ||
 178         (guint)(handle - VFS_FIRST_HANDLE) >= vfs_openfiles->len)
 179         return;
 180
 181     g_ptr_array_index (vfs_openfiles, handle - VFS_FIRST_HANDLE) =
 182                         (void *) vfs_free_handle_list;
 183     vfs_free_handle_list = handle - VFS_FIRST_HANDLE;
 184 }
 185
 186 static struct vfs_class *vfs_list;
 187
 188 int
 189 vfs_register_class (struct vfs_class *vfs)
 190 {
 191     if (vfs->init)              /* vfs has own initialization function */
 192         if (!(*vfs->init)(vfs)) /* but it failed */
 193             return 0;
 194
 195     vfs->next = vfs_list;
 196     vfs_list = vfs;
 197
 198     return 1;
 199 }
 200
 201 /** Return VFS class for the given prefix */
 202 static struct vfs_class *
 203 vfs_prefix_to_class (char *prefix)
 204 {
 205     struct vfs_class *vfs;
 206
 207     /* Avoid last class (localfs) that would accept any prefix */
 208     for (vfs = vfs_list; vfs->next; vfs = vfs->next) {
 209         if (vfs->which) {
 210             if ((*vfs->which) (vfs, prefix) == -1)
 211                 continue;
 212             return vfs;
 213         }
 214         if (vfs->prefix
 215             && !strncmp (prefix, vfs->prefix, strlen (vfs->prefix)))
 216             return vfs;
 217     }
 218     return NULL;
 219 }
 220
 221 /** Strip known vfs suffixes from a filename (possible improvement: strip
 222  *  suffix from last path component).
 223  *  \return a malloced string which has to be freed.
 224  */
 225 char *
 226 vfs_strip_suffix_from_filename (const char *filename)
 227 {
 228     struct vfs_class *vfs;
 229     char *semi;
 230     char *p;
 231
 232     if (!filename)
 233         vfs_die ("vfs_strip_suffix_from_path got NULL: impossible");
 234
 235     p = g_strdup (filename);
 236     if (!(semi = strrchr (p, '#')))
 237         return p;
 238
 239     /* Avoid last class (localfs) that would accept any prefix */
 240     for (vfs = vfs_list; vfs->next; vfs = vfs->next) {
 241         if (vfs->which) {
 242             if ((*vfs->which) (vfs, semi + 1) == -1)
 243                 continue;
 244             *semi = '\0';       /* Found valid suffix */
 245             return p;
 246         }
 247         if (vfs->prefix
 248             && !strncmp (semi + 1, vfs->prefix, strlen (vfs->prefix))) {
 249             *semi = '\0';       /* Found valid suffix */
 250             return p;
 251         }
 252     }
 253     return p;
 254 }
 255
 256 static int
 257 path_magic (const char *path)
 258 {
 259     struct stat buf;
 260
 261     if (!stat(path, &buf))
 262         return 0;
 263
 264     return 1;
 265 }
 266
 267 /**
 268  * Splits path extracting vfs part.
 269  *
 270  * Splits path
 271  * \verbatim /p1#op/inpath \endverbatim
 272  * into
 273  * \verbatim inpath,op; \endverbatim
 274  * returns which vfs it is.
 275  * What is left in path is p1. You still want to g_free(path), you DON'T
 276  * want to free neither *inpath nor *op
 277  */
 278 struct vfs_class *
 279 vfs_split (char *path, char **inpath, char **op)
 280 {
 281     char *semi;
 282     char *slash, *at_chr;
 283     struct vfs_class *ret;
 284
 285     if (!path)
 286         vfs_die("Cannot split NULL");
 287
 288     semi = strrchr (path, '#');
 289     if (!semi || !path_magic(path))
 290         return NULL;
 291
 292     at_chr = strrchr (semi, '@');
 293     if (at_chr)
 294         slash = strchr (at_chr, PATH_SEP);
 295     else
 296         slash = strchr (semi, PATH_SEP);
 297
 298     *semi = 0;
 299
 300     if (op)
 301         *op = NULL;
 302
 303     if (inpath)
 304         *inpath = NULL;
 305
 306     if (slash)
 307         *slash = 0;
 308
 309     if ((ret = vfs_prefix_to_class (semi+1))){
 310         if (op)
 311             *op = semi + 1;
 312         if (inpath)
 313             *inpath = slash ? slash + 1 : NULL;
 314         return ret;
 315     }
 316
 317
 318     if (slash)
 319         *slash = PATH_SEP;
 320     ret = vfs_split (path, inpath, op);
 321     *semi = '#';
 322     return ret;
 323 }
 324
 325 static struct vfs_class *
 326 _vfs_get_class (char *path)
 327 {
 328     char *semi;
 329     char *slash;
 330     struct vfs_class *ret;
 331
 332     g_return_val_if_fail(path, NULL);
 333
 334     semi = strrchr (path, '#');
 335     if (!semi || !path_magic (path))
 336         return NULL;
 337
 338     slash = strchr (semi, PATH_SEP);
 339     *semi = 0;
 340     if (slash)
 341         *slash = 0;
 342
 343     ret = vfs_prefix_to_class (semi+1);
 344
 345     if (slash)
 346         *slash = PATH_SEP;
 347     if (!ret)
 348         ret = _vfs_get_class (path);
 349
 350     *semi = '#';
 351     return ret;
 352 }
 353
 354 struct vfs_class *
 355 vfs_get_class (const char *pathname)
 356 {
 357     struct vfs_class *vfs;
 358     char *path = g_strdup (pathname);
 359
 360     vfs = _vfs_get_class (path);
 361     g_free (path);
 362
 363     if (!vfs)
 364         vfs = localfs_class;
 365
 366     return vfs;
 367 }
 368
 369 const char *
 370 vfs_get_encoding (const char *path)
 371 {
 372     static char result[16];
 373     char *work;
 374     char *semi;
 375     char *slash;
 376
 377     work = g_strdup (path);
 378     semi = g_strrstr (work, "#enc:");
 379
 380     if (semi != NULL) {
 381         semi+= 5 * sizeof (char);
 382         slash = strchr (semi, PATH_SEP);
 383         if (slash != NULL)
 384             slash[0] = '\0';
 385
 386         g_strlcpy (result, semi, sizeof(result));
 387         g_free (work);
 388         return result;
 389     }  else {
 390         g_free (work);
 391         return NULL;
 392     }
 393 }
 394
 395 /* return if encoding can by used in vfs (is ascci full compactible) */
 396 /* contains only a few encoding now */
 397 static int
 398 vfs_supported_enconding (const char *encoding) {
 399     int t;
 400     int result = 0;
 401
 402     for (t = 0; supported_encodings[t] != NULL; t++) {
 403         result+= (g_ascii_strncasecmp (encoding, supported_encodings[t],
 404                   strlen (supported_encodings[t])) == 0);
 405     }
 406
 407     return result;
 408 }
 409
 410 /* now used only by vfs_translate_path, but could be used in other vfs
 411  * plugin to automatic detect encoding
 412  * path - path to translate
 413  * size - how many bytes from path translate
 414  * defcnv - convertor, that is used as default, when path does not contain any
 415  *          #enc: subtring
 416  * buffer - used to store result of translation
 417  */
 418 static estr_t
 419 _vfs_translate_path (const char *path, int size,
 420                      GIConv defcnv, GString *buffer)
 421 {
 422     const char *semi;
 423     const char *ps;
 424     const char *slash;
 425     estr_t state = ESTR_SUCCESS;
 426     static char encoding[16];
 427     GIConv coder;
 428     int ms;
 429
 430     if (size == 0) return 0;
 431     size = ( size > 0) ? size : (signed int)strlen (path);
 432
 433     /* try found #end: */
 434     semi = g_strrstr_len (path, size, "#enc:");
 435     if (semi != NULL) {
 436         /* first must be translated part before #enc: */
 437         ms = semi - path;
 438
 439         /* remove '/' before #enc */
 440         ps = str_cget_prev_char (semi);
 441         if (ps[0] == PATH_SEP) ms = ps - path;
 442
 443         state = _vfs_translate_path (path, ms, defcnv, buffer);
 444
 445         if (state != ESTR_SUCCESS)
 446             return state;
 447         /* now can be translated part after #enc: */
 448
 449         semi+= 5;
 450         slash = strchr (semi, PATH_SEP);
 451         /* ignore slashes after size; */
 452         if (slash - path >= size) slash = NULL;
 453
 454         ms = (slash != NULL) ? slash - semi : (int) strlen (semi);
 455         ms = min ((unsigned int) ms, sizeof (encoding) - 1);
 456         /* limit encoding size (ms) to path size (size) */
 457         if (semi + ms > path + size) ms = path + size - semi;
 458         memcpy (encoding, semi, ms);
 459         encoding[ms] = '\0';
 460
 461         switch (vfs_supported_enconding (encoding)) {
 462             case 1:
 463                 coder = str_crt_conv_to (encoding);
 464                 if (coder != INVALID_CONV)  {
 465                     if (slash != NULL) {
 466                         state = str_vfs_convert_to (coder, slash,
 467                                 path + size - slash, buffer);
 468                     } else if (buffer->str[0] == '\0') {
 469                         /* exmaple "/#enc:utf-8" */
 470                         g_string_append_c(buffer, PATH_SEP);
 471                     }
 472                     str_close_conv (coder);
 473                     return state;
 474                 } else {
 475                     errno = EINVAL;
 476                     return ESTR_FAILURE;
 477                 }
 478                 break;
 479             default:
 480                 errno = EINVAL;
 481                 return ESTR_FAILURE;
 482         }
 483     } else {
 484         /* path can be translated whole at once */
 485         state = str_vfs_convert_to (defcnv, path, size, buffer);
 486         return state;
 487     }
 488
 489     return ESTR_SUCCESS;
 490 }
 491
 492 char *
 493 vfs_translate_path (const char *path)
 494 {
 495     estr_t state;
 496
 497     g_string_set_size(vfs_str_buffer,0);
 498     state = _vfs_translate_path (path, -1, str_cnv_from_term, vfs_str_buffer);
 499     /*
 500      strict version
 501      return (state == 0) ? vfs_str_buffer->data : NULL;
 502     */
 503     return (state != ESTR_FAILURE) ? vfs_str_buffer->str : NULL;
 504 }
 505
 506 char *
 507 vfs_translate_path_n (const char *path)
 508 {
 509     char *result;
 510
 511     result = vfs_translate_path (path);
 512     return (result != NULL) ? g_strdup (result) : NULL;
 513 }
 514
 515 char *
 516 vfs_canon_and_translate (const char *path)
 517 {
 518     char *canon;
 519     char *result;
 520     if (path == NULL)
 521         canon = g_strdup ("");
 522     else
 523         canon = vfs_canon (path);
 524     result = vfs_translate_path_n (canon);
 525     g_free (canon);
 526     return result;
 527 }
 528
 529 static int
 530 ferrno (struct vfs_class *vfs)
 531 {
 532     return vfs->ferrno ? (*vfs->ferrno)(vfs) : E_UNKNOWN;
 533     /* Hope that error message is obscure enough ;-) */
 534 }
 535
 536 int
 537 mc_open (const char *filename, int flags, ...)
 538 {
 539     int  mode;
 540     void *info;
 541     va_list ap;
 542
 543     char *file = vfs_canon_and_translate (filename);
 544     if (file != NULL) {
 545     struct vfs_class *vfs = vfs_get_class (file);
 546
 547     /* Get the mode flag */
 548     if (flags & O_CREAT) {
 549         va_start (ap, flags);
 550         mode = va_arg (ap, int);
 551         va_end (ap);
 552     } else
 553         mode = 0;
 554
 555     if (!vfs->open) {
 556         g_free (file);
 557         errno = -EOPNOTSUPP;
 558         return -1;
 559     }
 560
 561     info = (*vfs->open) (vfs, file, flags, mode);       /* open must be supported */
 562     g_free (file);
 563     if (!info){
 564         errno = ferrno (vfs);
 565         return -1;
 566     }
 567
 568     return vfs_new_handle (vfs, info);
 569     } else return -1;
 570 }
 571
 572
 573 #define MC_NAMEOP(name, inarg, callarg) \
 574 int mc_##name inarg \
 575 { \
 576     struct vfs_class *vfs; \
 577     int result; \
 578     char *mpath = vfs_canon_and_translate (path); \
 579     if (mpath != NULL) { \
 580     vfs = vfs_get_class (mpath); \
 581     if (vfs == NULL){ \
 582         g_free (mpath); \
 583         return -1; \
 584     } \
 585     result = vfs->name ? (*vfs->name)callarg : -1; \
 586     g_free (mpath); \
 587     if (result == -1) \
 588         errno = vfs->name ? ferrno (vfs) : E_NOTSUPP; \
 589     return result; \
 590     } else return -1; \
 591 }
 592
 593 MC_NAMEOP (chmod, (const char *path, mode_t mode), (vfs, mpath, mode))
 594 MC_NAMEOP (chown, (const char *path, uid_t owner, gid_t group), (vfs, mpath, owner, group))
 595 MC_NAMEOP (utime, (const char *path, struct utimbuf *times), (vfs, mpath, times))
 596 MC_NAMEOP (readlink, (const char *path, char *buf, int bufsiz), (vfs, mpath, buf, bufsiz))
 597 MC_NAMEOP (unlink, (const char *path), (vfs, mpath))
 598 MC_NAMEOP (mkdir, (const char *path, mode_t mode), (vfs, mpath, mode))
 599 MC_NAMEOP (rmdir, (const char *path), (vfs, mpath))
 600 MC_NAMEOP (mknod, (const char *path, mode_t mode, dev_t dev), (vfs, mpath, mode, dev))
 601
 602 int
 603 mc_symlink (const char *name1, const char *path)
 604 {
 605     struct vfs_class *vfs;
 606     int result;
 607     char *mpath;
 608     char *lpath;
 609     char *tmp;
 610
 611     mpath = vfs_canon_and_translate (path);
 612     if (mpath != NULL) {
 613         tmp = g_strdup (name1);
 614         lpath = vfs_translate_path_n (tmp);
 615         g_free (tmp);
 616
 617         if (lpath != NULL) {
 618             vfs = vfs_get_class (mpath);
 619             result = vfs->symlink ? (*vfs->symlink) (vfs, lpath, mpath) : -1;
 620             g_free (lpath);
 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          * (NAME_MAX + 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) + NAME_MAX + 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, NAME_MAX + 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 *sys_cwd;
 931     char *trans;
 932     const char *encoding;
 933     char *tmp;
 934     estr_t state;
 935     struct stat my_stat, my_stat2;
 936
 937     trans = vfs_translate_path_n (current_dir); /* add check if NULL */
 938
 939     if (!_vfs_get_class (trans)) {
 940         encoding = vfs_get_encoding (current_dir);
 941         if (encoding == NULL) {
 942             tmp = g_get_current_dir ();
 943             if (tmp != NULL) { /* One of the directories in the path is not readable */
 944                 g_string_set_size(vfs_str_buffer,0);
 945                 state = str_vfs_convert_from (str_cnv_from_term, tmp, vfs_str_buffer);
 946                 g_free (tmp);
 947                 sys_cwd = (state == ESTR_SUCCESS) ? g_strdup (vfs_str_buffer->str) : NULL;
 948                 if (!sys_cwd)
 949                     return current_dir;
 950
 951         /* Otherwise check if it is O.K. to use the current_dir */
 952                 if (!cd_symlinks || mc_stat (sys_cwd, &my_stat)
 953             || mc_stat (current_dir, &my_stat2)
 954             || my_stat.st_ino != my_stat2.st_ino
 955             || my_stat.st_dev != my_stat2.st_dev) {
 956             g_free (current_dir);
 957                     current_dir = sys_cwd;
 958                     return sys_cwd;
 959                      }/* Otherwise we return current_dir below */
 960             }
 961     }
 962     }
 963     g_free (trans);
 964     return current_dir;
 965 }
 966
 967 static void
 968 vfs_setup_wd (void)
 969 {
 970     current_dir = g_strdup (PATH_SEP_STR);
 971     _vfs_get_cwd ();
 972
 973     if (strlen (current_dir) > MC_MAXPATHLEN - 2)
 974         vfs_die ("Current dir too long.\n");
 975
 976     current_vfs = vfs_get_class (current_dir);
 977 }
 978
 979 /**
 980  * Return current directory. If it's local, reread the current directory
 981  * from the OS. Put directory to the provided buffer.
 982  */
 983 char *
 984 mc_get_current_wd (char *buffer, int size)
 985 {
 986     const char *cwd = _vfs_get_cwd ();
 987
 988     g_strlcpy (buffer, cwd, size);
 989     return buffer;
 990 }
 991
 992 /**
 993  * Return current directory without any OS calls.
 994  */
 995 char *
 996 vfs_get_current_dir (void)
 997 {
 998     return current_dir;
 999 }
1000
1001 off_t mc_lseek (int fd, off_t offset, int whence)
1002 {
1003     struct vfs_class *vfs;
1004     int result;
1005
1006     if (fd == -1)
1007         return -1;
1008
1009     vfs = vfs_op (fd);
1010     if (vfs == NULL)
1011         return -1;
1012
1013     result = vfs->lseek ? (*vfs->lseek)(vfs_info (fd), offset, whence) : -1;
1014     if (result == -1)
1015         errno = vfs->lseek ? ferrno (vfs) : E_NOTSUPP;
1016     return result;
1017 }
1018
1019 /**
1020  * remove //, /./ and /../
1021  */
1022
1023 #define ISSLASH(a) (!a || (a == '/'))
1024
1025 char *
1026 vfs_canon (const char *path)
1027 {
1028     if (!path)
1029         vfs_die("Cannot canonicalize NULL");
1030
1031     /* Relative to current directory */
1032     if (*path != PATH_SEP){
1033         char *local, *result;
1034
1035         local = concat_dir_and_file (current_dir, path);
1036
1037         result = vfs_canon (local);
1038         g_free (local);
1039         return result;
1040     }
1041
1042     /*
1043      * So we have path of following form:
1044      * /p1/p2#op/.././././p3#op/p4. Good luck.
1045      */
1046     {
1047         char *result = g_strdup (path);
1048         canonicalize_pathname (result);
1049         return result;
1050     }
1051 }
1052
1053 /**
1054  * VFS chdir.
1055  * Return 0 on success, -1 on failure.
1056  */
1057 int
1058 mc_chdir (const char *path)
1059 {
1060     char *new_dir;
1061     char *trans_dir;
1062     struct vfs_class *old_vfs, *new_vfs;
1063     vfsid old_vfsid;
1064     int result;
1065
1066     new_dir = vfs_canon (path);
1067     trans_dir = vfs_translate_path_n (new_dir);
1068     if (trans_dir != NULL) {
1069         new_vfs = vfs_get_class (trans_dir);
1070     if (!new_vfs->chdir) {
1071         g_free (new_dir);
1072             g_free (trans_dir);
1073         return -1;
1074     }
1075
1076         result = (*new_vfs->chdir) (new_vfs, trans_dir);
1077
1078     if (result == -1) {
1079         errno = ferrno (new_vfs);
1080         g_free (new_dir);
1081             g_free (trans_dir);
1082         return -1;
1083     }
1084
1085     old_vfsid = vfs_getid (current_vfs, current_dir);
1086     old_vfs = current_vfs;
1087
1088     /* Actually change directory */
1089     g_free (current_dir);
1090     current_dir = new_dir;
1091     current_vfs = new_vfs;
1092
1093     /* This function uses the new current_dir implicitly */
1094     vfs_stamp_create (old_vfs, old_vfsid);
1095
1096     /* Sometimes we assume no trailing slash on cwd */
1097     if (*current_dir) {
1098         char *p;
1099         p = strchr (current_dir, 0) - 1;
1100         if (*p == PATH_SEP && p > current_dir)
1101             *p = 0;
1102     }
1103
1104         g_free (trans_dir);
1105     return 0;
1106     } else {
1107         g_free (new_dir);
1108         return -1;
1109     }
1110 }
1111
1112 /* Return 1 is the current VFS class is local */
1113 int
1114 vfs_current_is_local (void)
1115 {
1116     return (current_vfs->flags & VFSF_LOCAL) != 0;
1117 }
1118
1119 /* Return flags of the VFS class of the given filename */
1120 int
1121 vfs_file_class_flags (const char *filename)
1122 {
1123     struct vfs_class *vfs;
1124     char *fname;
1125
1126     fname = vfs_canon_and_translate (filename);
1127     if (fname != NULL) {
1128     vfs = vfs_get_class (fname);
1129     g_free (fname);
1130     return vfs->flags;
1131     } else return -1;
1132 }
1133
1134 static char *
1135 mc_def_getlocalcopy (const char *filename)
1136 {
1137     char *tmp;
1138     int fdin, fdout;
1139     ssize_t i;
1140     char buffer[8192];
1141     struct stat mystat;
1142
1143     fdin = mc_open (filename, O_RDONLY | O_LINEAR);
1144     if (fdin == -1)
1145         return NULL;
1146
1147     fdout = vfs_mkstemps (&tmp, "vfs", filename);
1148
1149     if (fdout == -1)
1150         goto fail;
1151     while ((i = mc_read (fdin, buffer, sizeof (buffer))) > 0) {
1152         if (write (fdout, buffer, i) != i)
1153             goto fail;
1154     }
1155     if (i == -1)
1156         goto fail;
1157     i = mc_close (fdin);
1158     fdin = -1;
1159     if (i == -1)
1160         goto fail;
1161     if (close (fdout) == -1) {
1162         fdout = -1;
1163         goto fail;
1164     }
1165
1166     if (mc_stat (filename, &mystat) != -1) {
1167         chmod (tmp, mystat.st_mode);
1168     }
1169     return tmp;
1170
1171   fail:
1172     if (fdout != -1)
1173         close (fdout);
1174     if (fdin != -1)
1175         mc_close (fdin);
1176     g_free (tmp);
1177     return NULL;
1178 }
1179
1180 char *
1181 mc_getlocalcopy (const char *pathname)
1182 {
1183     char *result;
1184     char *path;
1185
1186     path = vfs_canon_and_translate (pathname);
1187     if (path != NULL) {
1188     struct vfs_class *vfs = vfs_get_class (path);
1189
1190     result = vfs->getlocalcopy ? (*vfs->getlocalcopy)(vfs, path) :
1191                                  mc_def_getlocalcopy (path);
1192     g_free (path);
1193     if (!result)
1194         errno = ferrno (vfs);
1195     return result;
1196     } else return NULL;
1197 }
1198
1199 static int
1200 mc_def_ungetlocalcopy (struct vfs_class *vfs, const char *filename,
1201                        const char *local, int has_changed)
1202 {
1203     int fdin = -1, fdout = -1, i;
1204     if (has_changed) {
1205         char buffer[8192];
1206
1207         if (!vfs->write)
1208             goto failed;
1209
1210         fdin = open (local, O_RDONLY);
1211         if (fdin == -1)
1212             goto failed;
1213         fdout = mc_open (filename, O_WRONLY | O_TRUNC);
1214         if (fdout == -1)
1215             goto failed;
1216         while ((i = read (fdin, buffer, sizeof (buffer))) > 0) {
1217             if (mc_write (fdout, buffer, i) != i)
1218                 goto failed;
1219         }
1220         if (i == -1)
1221             goto failed;
1222
1223         if (close (fdin) == -1) {
1224             fdin = -1;
1225             goto failed;
1226         }
1227         fdin = -1;
1228         if (mc_close (fdout) == -1) {
1229             fdout = -1;
1230             goto failed;
1231         }
1232     }
1233     unlink (local);
1234     return 0;
1235
1236   failed:
1237     message (D_ERROR, _("Changes to file lost"), "%s", filename);
1238     if (fdout != -1)
1239         mc_close (fdout);
1240     if (fdin != -1)
1241         close (fdin);
1242     unlink (local);
1243     return -1;
1244 }
1245
1246 int
1247 mc_ungetlocalcopy (const char *pathname, const char *local, int has_changed)
1248 {
1249     int return_value = 0;
1250     char *path;
1251
1252     path = vfs_canon_and_translate (pathname);
1253     if (path != NULL) {
1254     struct vfs_class *vfs = vfs_get_class (path);
1255
1256     return_value = vfs->ungetlocalcopy ?
1257             (*vfs->ungetlocalcopy)(vfs, path, local, has_changed) :
1258             mc_def_ungetlocalcopy (vfs, path, local, has_changed);
1259     g_free (path);
1260     return return_value;
1261     } else return -1;
1262 }
1263
1264
1265 void
1266 vfs_init (void)
1267 {
1268     /* create the VFS handle array */
1269     vfs_openfiles = g_ptr_array_new ();
1270
1271     vfs_str_buffer = g_string_new("");
1272     /* localfs needs to be the first one */
1273     init_localfs();
1274     /* fallback value for vfs_get_class() */
1275     localfs_class = vfs_list;
1276
1277     init_extfs ();
1278     init_sfs ();
1279     init_tarfs ();
1280     init_cpiofs ();
1281
1282 #ifdef USE_EXT2FSLIB
1283     init_undelfs ();
1284 #endif /* USE_EXT2FSLIB */
1285
1286 #ifdef USE_NETCODE
1287     tcp_init();
1288     init_ftpfs ();
1289     init_fish ();
1290 #ifdef WITH_SMBFS
1291     init_smbfs ();
1292 #endif /* WITH_SMBFS */
1293 #ifdef ENABLE_VFS_MCFS
1294     init_mcfs ();
1295 #endif /* ENABLE_VFS_MCFS */
1296 #endif /* USE_NETCODE */
1297
1298     vfs_setup_wd ();
1299 }
1300
1301 void
1302 vfs_shut (void)
1303 {
1304     struct vfs_class *vfs;
1305
1306     vfs_gc_done ();
1307
1308     g_free (current_dir);
1309
1310     for (vfs = vfs_list; vfs; vfs = vfs->next)
1311         if (vfs->done)
1312             (*vfs->done) (vfs);
1313
1314     g_ptr_array_free (vfs_openfiles, TRUE);
1315     g_string_free (vfs_str_buffer, TRUE);
1316     g_free (mc_readdir_result);
1317 }
1318
1319 /*
1320  * These ones grab information from the VFS
1321  *  and handles them to an upper layer
1322  */
1323 void
1324 vfs_fill_names (fill_names_f func)
1325 {
1326     struct vfs_class *vfs;
1327
1328     for (vfs=vfs_list; vfs; vfs=vfs->next)
1329         if (vfs->fill_names)
1330             (*vfs->fill_names) (vfs, func);
1331 }
1332
1333 /*
1334  * Returns vfs path corresponding to given url. If passed string is
1335  * not recognized as url, g_strdup(url) is returned.
1336  */
1337
1338 static const struct {
1339     const char *name;
1340     size_t name_len;
1341     const char *substitute;
1342 } url_table[] = { {"ftp://", 6, "/#ftp:"},
1343                   {"mc://", 5, "/#mc:"},
1344                   {"smb://", 6, "/#smb:"},
1345                   {"sh://", 5, "/#sh:"},
1346                   {"ssh://", 6, "/#sh:"},
1347                   {"a:", 2, "/#a"}
1348 };
1349
1350 char *
1351 vfs_translate_url (const char *url)
1352 {
1353     size_t i;
1354
1355     for (i = 0; i < sizeof (url_table)/sizeof (url_table[0]); i++)
1356        if (strncmp (url, url_table[i].name, url_table[i].name_len) == 0)
1357            return g_strconcat (url_table[i].substitute, url + url_table[i].name_len, (char*) NULL);
1358
1359     return g_strdup (url);
1360 }
1361
1362 int vfs_file_is_local (const char *filename)
1363 {
1364     return vfs_file_class_flags (filename) & VFSF_LOCAL;
1365 }