gio/glocalfileenumerator.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Alexander Larsson <alexl@redhat.com>
  19  */
  20
  21 #include "config.h"
  22
  23 #include <glib.h>
  24 #include <glocalfileenumerator.h>
  25 #include <glocalfileinfo.h>
  26 #include <glocalfile.h>
  27 #include <gioerror.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include "glibintl.h"
  31
  32
  33 #define CHUNK_SIZE 1000
  34
  35 #ifdef G_OS_WIN32
  36 #define USE_GDIR
  37 #endif
  38
  39 #ifndef USE_GDIR
  40
  41 #include <sys/types.h>
  42 #include <dirent.h>
  43 #include <errno.h>
  44
  45 typedef struct {
  46   char *name;
  47   long inode;
  48   GFileType type;
  49 } DirEntry;
  50
  51 #endif
  52
  53 struct _GLocalFileEnumerator
  54 {
  55   GFileEnumerator parent;
  56
  57   GFileAttributeMatcher *matcher;
  58   GFileAttributeMatcher *reduced_matcher;
  59   char *filename;
  60   char *attributes;
  61   GFileQueryInfoFlags flags;
  62
  63   gboolean got_parent_info;
  64   GLocalParentFileInfo parent_info;
  65
  66 #ifdef USE_GDIR
  67   GDir *dir;
  68 #else
  69   DIR *dir;
  70   DirEntry *entries;
  71   int entries_pos;
  72   gboolean at_end;
  73 #endif
  74
  75   gboolean follow_symlinks;
  76 };
  77
  78 #define g_local_file_enumerator_get_type _g_local_file_enumerator_get_type
  79 G_DEFINE_TYPE (GLocalFileEnumerator, g_local_file_enumerator, G_TYPE_FILE_ENUMERATOR);
  80
  81 static GFileInfo *g_local_file_enumerator_next_file (GFileEnumerator  *enumerator,
  82                                                      GCancellable     *cancellable,
  83                                                      GError          **error);
  84 static gboolean   g_local_file_enumerator_close     (GFileEnumerator  *enumerator,
  85                                                      GCancellable     *cancellable,
  86                                                      GError          **error);
  87
  88
  89 static void
  90 free_entries (GLocalFileEnumerator *local)
  91 {
  92 #ifndef USE_GDIR
  93   int i;
  94
  95   if (local->entries != NULL)
  96     {
  97       for (i = 0; local->entries[i].name != NULL; i++)
  98         g_free (local->entries[i].name);
  99
 100       g_free (local->entries);
 101     }
 102 #endif
 103 }
 104
 105 static void
 106 g_local_file_enumerator_finalize (GObject *object)
 107 {
 108   GLocalFileEnumerator *local;
 109
 110   local = G_LOCAL_FILE_ENUMERATOR (object);
 111
 112   if (local->got_parent_info)
 113     _g_local_file_info_free_parent_info (&local->parent_info);
 114   g_free (local->filename);
 115   g_file_attribute_matcher_unref (local->matcher);
 116   g_file_attribute_matcher_unref (local->reduced_matcher);
 117   if (local->dir)
 118     {
 119 #ifdef USE_GDIR
 120       g_dir_close (local->dir);
 121 #else
 122       closedir (local->dir);
 123 #endif
 124       local->dir = NULL;
 125     }
 126
 127   free_entries (local);
 128
 129   G_OBJECT_CLASS (g_local_file_enumerator_parent_class)->finalize (object);
 130 }
 131
 132
 133 static void
 134 g_local_file_enumerator_class_init (GLocalFileEnumeratorClass *klass)
 135 {
 136   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 137   GFileEnumeratorClass *enumerator_class = G_FILE_ENUMERATOR_CLASS (klass);
 138
 139   gobject_class->finalize = g_local_file_enumerator_finalize;
 140
 141   enumerator_class->next_file = g_local_file_enumerator_next_file;
 142   enumerator_class->close_fn = g_local_file_enumerator_close;
 143 }
 144
 145 static void
 146 g_local_file_enumerator_init (GLocalFileEnumerator *local)
 147 {
 148 }
 149
 150 #ifdef USE_GDIR
 151 static void
 152 convert_file_to_io_error (GError **error,
 153                           GError  *file_error)
 154 {
 155   int new_code;
 156
 157   if (file_error == NULL)
 158     return;
 159
 160   new_code = G_IO_ERROR_FAILED;
 161
 162   if (file_error->domain == G_FILE_ERROR)
 163     {
 164       switch (file_error->code)
 165         {
 166         case G_FILE_ERROR_NOENT:
 167           new_code = G_IO_ERROR_NOT_FOUND;
 168           break;
 169         case G_FILE_ERROR_ACCES:
 170           new_code = G_IO_ERROR_PERMISSION_DENIED;
 171           break;
 172         case G_FILE_ERROR_NOTDIR:
 173           new_code = G_IO_ERROR_NOT_DIRECTORY;
 174           break;
 175         case G_FILE_ERROR_MFILE:
 176           new_code = G_IO_ERROR_TOO_MANY_OPEN_FILES;
 177           break;
 178         default:
 179           break;
 180         }
 181     }
 182
 183   g_set_error_literal (error, G_IO_ERROR,
 184                        new_code,
 185                        file_error->message);
 186 }
 187 #else
 188 static GFileAttributeMatcher *
 189 g_file_attribute_matcher_subtract_attributes (GFileAttributeMatcher *matcher,
 190                                               const char *           attributes)
 191 {
 192   GFileAttributeMatcher *result, *tmp;
 193
 194   tmp = g_file_attribute_matcher_new (attributes);
 195   result = g_file_attribute_matcher_subtract (matcher, tmp);
 196   g_file_attribute_matcher_unref (tmp);
 197
 198   return result;
 199 }
 200 #endif
 201
 202 GFileEnumerator *
 203 _g_local_file_enumerator_new (GLocalFile *file,
 204                               const char           *attributes,
 205                               GFileQueryInfoFlags   flags,
 206                               GCancellable         *cancellable,
 207                               GError              **error)
 208 {
 209   GLocalFileEnumerator *local;
 210   char *filename = g_file_get_path (G_FILE (file));
 211
 212 #ifdef USE_GDIR
 213   GError *dir_error;
 214   GDir *dir;
 215
 216   dir_error = NULL;
 217   dir = g_dir_open (filename, 0, error != NULL ? &dir_error : NULL);
 218   if (dir == NULL)
 219     {
 220       if (error != NULL)
 221         {
 222           convert_file_to_io_error (error, dir_error);
 223           g_error_free (dir_error);
 224         }
 225       g_free (filename);
 226       return NULL;
 227     }
 228 #else
 229   DIR *dir;
 230   int errsv;
 231
 232   dir = opendir (filename);
 233   if (dir == NULL)
 234     {
 235       errsv = errno;
 236
 237       g_set_error_literal (error, G_IO_ERROR,
 238                            g_io_error_from_errno (errsv),
 239                            g_strerror (errsv));
 240       g_free (filename);
 241       return NULL;
 242     }
 243
 244 #endif
 245
 246   local = g_object_new (G_TYPE_LOCAL_FILE_ENUMERATOR,
 247                         "container", file,
 248                         NULL);
 249
 250   local->dir = dir;
 251   local->filename = filename;
 252   local->matcher = g_file_attribute_matcher_new (attributes);
 253 #ifndef USE_GDIR
 254   local->reduced_matcher = g_file_attribute_matcher_subtract_attributes (local->matcher,
 255                                                                          G_LOCAL_FILE_INFO_NOSTAT_ATTRIBUTES","
 256                                                                          "standard::type");
 257 #endif
 258   local->flags = flags;
 259
 260   return G_FILE_ENUMERATOR (local);
 261 }
 262
 263 #ifndef USE_GDIR
 264 static int
 265 sort_by_inode (const void *_a, const void *_b)
 266 {
 267   const DirEntry *a, *b;
 268
 269   a = _a;
 270   b = _b;
 271   return a->inode - b->inode;
 272 }
 273
 274 #ifdef HAVE_STRUCT_DIRENT_D_TYPE
 275 static GFileType
 276 file_type_from_dirent (char d_type)
 277 {
 278   switch (d_type)
 279     {
 280     case DT_BLK:
 281     case DT_CHR:
 282     case DT_FIFO:
 283     case DT_SOCK:
 284       return G_FILE_TYPE_SPECIAL;
 285     case DT_DIR:
 286       return G_FILE_TYPE_DIRECTORY;
 287     case DT_LNK:
 288       return G_FILE_TYPE_SYMBOLIC_LINK;
 289     case DT_REG:
 290       return G_FILE_TYPE_REGULAR;
 291     case DT_UNKNOWN:
 292     default:
 293       return G_FILE_TYPE_UNKNOWN;
 294     }
 295 }
 296 #endif
 297
 298 static const char *
 299 next_file_helper (GLocalFileEnumerator *local, GFileType *file_type)
 300 {
 301   struct dirent *entry;
 302   const char *filename;
 303   int i;
 304
 305   if (local->at_end)
 306     return NULL;
 307
 308   if (local->entries == NULL ||
 309       (local->entries[local->entries_pos].name == NULL))
 310     {
 311       if (local->entries == NULL)
 312         local->entries = g_new (DirEntry, CHUNK_SIZE + 1);
 313       else
 314         {
 315           /* Restart by clearing old names */
 316           for (i = 0; local->entries[i].name != NULL; i++)
 317             g_free (local->entries[i].name);
 318         }
 319
 320       for (i = 0; i < CHUNK_SIZE; i++)
 321         {
 322           entry = readdir (local->dir);
 323           while (entry
 324                  && (0 == strcmp (entry->d_name, ".") ||
 325                      0 == strcmp (entry->d_name, "..")))
 326             entry = readdir (local->dir);
 327
 328           if (entry)
 329             {
 330               local->entries[i].name = g_strdup (entry->d_name);
 331               local->entries[i].inode = entry->d_ino;
 332 #if HAVE_STRUCT_DIRENT_D_TYPE
 333               local->entries[i].type = file_type_from_dirent (entry->d_type);
 334 #else
 335               local->entries[i].type = G_FILE_TYPE_UNKNOWN;
 336 #endif
 337             }
 338           else
 339             break;
 340         }
 341       local->entries[i].name = NULL;
 342       local->entries_pos = 0;
 343
 344       qsort (local->entries, i, sizeof (DirEntry), sort_by_inode);
 345     }
 346
 347   filename = local->entries[local->entries_pos].name;
 348   if (filename == NULL)
 349     local->at_end = TRUE;
 350
 351   *file_type = local->entries[local->entries_pos].type;
 352
 353   local->entries_pos++;
 354
 355   return filename;
 356 }
 357
 358 #endif
 359
 360 static GFileInfo *
 361 g_local_file_enumerator_next_file (GFileEnumerator  *enumerator,
 362                                    GCancellable     *cancellable,
 363                                    GError          **error)
 364 {
 365   GLocalFileEnumerator *local = G_LOCAL_FILE_ENUMERATOR (enumerator);
 366   const char *filename;
 367   char *path;
 368   GFileInfo *info;
 369   GError *my_error;
 370   GFileType file_type;
 371
 372   if (!local->got_parent_info)
 373     {
 374       _g_local_file_info_get_parent_info (local->filename, local->matcher, &local->parent_info);
 375       local->got_parent_info = TRUE;
 376     }
 377
 378  next_file:
 379
 380 #ifdef USE_GDIR
 381   filename = g_dir_read_name (local->dir);
 382   file_type = G_FILE_TYPE_UNKNOWN;
 383 #else
 384   filename = next_file_helper (local, &file_type);
 385 #endif
 386
 387   if (filename == NULL)
 388     return NULL;
 389
 390   my_error = NULL;
 391   path = g_build_filename (local->filename, filename, NULL);
 392   if (file_type == G_FILE_TYPE_UNKNOWN ||
 393       (file_type == G_FILE_TYPE_SYMBOLIC_LINK && !(local->flags & G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS)))
 394     {
 395       info = _g_local_file_info_get (filename, path,
 396                                      local->matcher,
 397                                      local->flags,
 398                                      &local->parent_info,
 399                                      &my_error);
 400     }
 401   else
 402     {
 403       info = _g_local_file_info_get (filename, path,
 404                                      local->reduced_matcher,
 405                                      local->flags,
 406                                      &local->parent_info,
 407                                      &my_error);
 408       if (info)
 409         {
 410           _g_local_file_info_get_nostat (info, filename, path, local->matcher);
 411           g_file_info_set_file_type (info, file_type);
 412           if (file_type == G_FILE_TYPE_SYMBOLIC_LINK)
 413             g_file_info_set_is_symlink (info, TRUE);
 414         }
 415     }
 416   g_free (path);
 417
 418   if (info == NULL)
 419     {
 420       /* Failed to get info */
 421       /* If the file does not exist there might have been a race where
 422        * the file was removed between the readdir and the stat, so we
 423        * ignore the file. */
 424       if (g_error_matches (my_error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
 425         {
 426           g_error_free (my_error);
 427           goto next_file;
 428         }
 429       else
 430         g_propagate_error (error, my_error);
 431     }
 432
 433   return info;
 434 }
 435
 436 static gboolean
 437 g_local_file_enumerator_close (GFileEnumerator  *enumerator,
 438                                GCancellable     *cancellable,
 439                                GError          **error)
 440 {
 441   GLocalFileEnumerator *local = G_LOCAL_FILE_ENUMERATOR (enumerator);
 442
 443   if (local->dir)
 444     {
 445 #ifdef USE_GDIR
 446       g_dir_close (local->dir);
 447 #else
 448       closedir (local->dir);
 449 #endif
 450       local->dir = NULL;
 451     }
 452
 453   return TRUE;
 454 }