glib/gdir.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * gdir.c: Simplified wrapper around the DIRENT functions.
   5  *
   6  * Copyright 2001 Hans Breuer
   7  * Copyright 2004 Tor Lillqvist
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2 of the License, or (at your option) any later version.
  13  *
  14  * This library 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 GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include "config.h"
  24
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <sys/stat.h>
  29
  30 #ifdef HAVE_DIRENT_H
  31 #include <sys/types.h>
  32 #include <dirent.h>
  33 #endif
  34
  35 #include "gdir.h"
  36
  37 #include "gconvert.h"
  38 #include "gfileutils.h"
  39 #include "gstrfuncs.h"
  40 #include "gtestutils.h"
  41 #include "glibintl.h"
  42
  43 #if defined (_MSC_VER) && !defined (HAVE_DIRENT_H)
  44 #include "../build/win32/dirent/dirent.h"
  45 #include "../build/win32/dirent/wdirent.c"
  46 #endif
  47
  48 #include "glib-private.h" /* g_dir_open_with_errno, g_dir_new_from_dirp */
  49
  50 /**
  51  * GDir:
  52  *
  53  * An opaque structure representing an opened directory.
  54  */
  55
  56 struct _GDir
  57 {
  58 #ifdef G_OS_WIN32
  59   _WDIR *wdirp;
  60 #else
  61   DIR *dirp;
  62 #endif
  63 #ifdef G_OS_WIN32
  64   gchar utf8_buf[FILENAME_MAX*4];
  65 #endif
  66 };
  67
  68 /*< private >
  69  * g_dir_open_with_errno:
  70  * @path: the path to the directory you are interested in.
  71  * @flags: Currently must be set to 0. Reserved for future use.
  72  *
  73  * Opens a directory for reading.
  74  *
  75  * This function is equivalent to g_dir_open() except in the error case,
  76  * errno will be set accordingly.
  77  *
  78  * This is useful if you want to construct your own error message.
  79  *
  80  * Returns: a newly allocated #GDir on success, or %NULL on failure,
  81  *   with errno set accordingly.
  82  *
  83  * Since: 2.38
  84  */
  85 GDir *
  86 g_dir_open_with_errno (const gchar *path,
  87                        guint        flags)
  88 {
  89   GDir dir;
  90 #ifdef G_OS_WIN32
  91   gint saved_errno;
  92   wchar_t *wpath;
  93 #endif
  94
  95   g_return_val_if_fail (path != NULL, NULL);
  96
  97 #ifdef G_OS_WIN32
  98   wpath = g_utf8_to_utf16 (path, -1, NULL, NULL, NULL);
  99
 100   g_return_val_if_fail (wpath != NULL, NULL);
 101
 102   dir.wdirp = _wopendir (wpath);
 103   saved_errno = errno;
 104   g_free (wpath);
 105   errno = saved_errno;
 106
 107   if (dir.wdirp == NULL)
 108     return NULL;
 109 #else
 110   dir.dirp = opendir (path);
 111
 112   if (dir.dirp == NULL)
 113     return NULL;
 114 #endif
 115
 116   return g_memdup (&dir, sizeof dir);
 117 }
 118
 119 /**
 120  * g_dir_open:
 121  * @path: the path to the directory you are interested in. On Unix
 122  *         in the on-disk encoding. On Windows in UTF-8
 123  * @flags: Currently must be set to 0. Reserved for future use.
 124  * @error: return location for a #GError, or %NULL.
 125  *         If non-%NULL, an error will be set if and only if
 126  *         g_dir_open() fails.
 127  *
 128  * Opens a directory for reading. The names of the files in the
 129  * directory can then be retrieved using g_dir_read_name().  Note
 130  * that the ordering is not defined.
 131  *
 132  * Returns: a newly allocated #GDir on success, %NULL on failure.
 133  *   If non-%NULL, you must free the result with g_dir_close()
 134  *   when you are finished with it.
 135  **/
 136 GDir *
 137 g_dir_open (const gchar  *path,
 138             guint         flags,
 139             GError      **error)
 140 {
 141   gint saved_errno;
 142   GDir *dir;
 143
 144   dir = g_dir_open_with_errno (path, flags);
 145
 146   if (dir == NULL)
 147     {
 148       gchar *utf8_path;
 149
 150       saved_errno = errno;
 151
 152       utf8_path = g_filename_to_utf8 (path, -1, NULL, NULL, NULL);
 153
 154       g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (saved_errno),
 155                    _("Error opening directory '%s': %s"), utf8_path, g_strerror (saved_errno));
 156       g_free (utf8_path);
 157     }
 158
 159   return dir;
 160 }
 161
 162 #if defined (G_OS_WIN32) && !defined (_WIN64)
 163
 164 /* The above function actually is called g_dir_open_utf8, and it's
 165  * that what applications compiled with this GLib version will
 166  * use.
 167  */
 168
 169 #undef g_dir_open
 170
 171 /* Binary compatibility version. Not for newly compiled code. */
 172
 173 GDir *
 174 g_dir_open (const gchar  *path,
 175             guint         flags,
 176             GError      **error)
 177 {
 178   gchar *utf8_path = g_locale_to_utf8 (path, -1, NULL, NULL, error);
 179   GDir *retval;
 180
 181   if (utf8_path == NULL)
 182     return NULL;
 183
 184   retval = g_dir_open_utf8 (utf8_path, flags, error);
 185
 186   g_free (utf8_path);
 187
 188   return retval;
 189 }
 190 #endif
 191
 192 /*< private >
 193  * g_dir_new_from_dirp:
 194  * @dirp: a #DIR* created by opendir() or fdopendir()
 195  *
 196  * Creates a #GDir object from the DIR object that is created using
 197  * opendir() or fdopendir().  The created #GDir assumes ownership of the
 198  * passed-in #DIR pointer.
 199  *
 200  * @dirp must not be %NULL.
 201  *
 202  * This function never fails.
 203  *
 204  * Returns: a newly allocated #GDir, which should be closed using
 205  *     g_dir_close().
 206  *
 207  * Since: 2.38
 208  **/
 209 GDir *
 210 g_dir_new_from_dirp (gpointer dirp)
 211 {
 212 #ifdef G_OS_UNIX
 213   GDir *dir;
 214
 215   g_return_val_if_fail (dirp != NULL, NULL);
 216
 217   dir = g_new (GDir, 1);
 218   dir->dirp = dirp;
 219
 220   return dir;
 221 #else
 222   g_assert_not_reached ();
 223 #endif
 224 }
 225
 226 /**
 227  * g_dir_read_name:
 228  * @dir: a #GDir* created by g_dir_open()
 229  *
 230  * Retrieves the name of another entry in the directory, or %NULL.
 231  * The order of entries returned from this function is not defined,
 232  * and may vary by file system or other operating-system dependent
 233  * factors.
 234  *
 235  * %NULL may also be returned in case of errors. On Unix, you can
 236  * check `errno` to find out if %NULL was returned because of an error.
 237  *
 238  * On Unix, the '.' and '..' entries are omitted, and the returned
 239  * name is in the on-disk encoding.
 240  *
 241  * On Windows, as is true of all GLib functions which operate on
 242  * filenames, the returned name is in UTF-8.
 243  *
 244  * Returns: (type filename): The entry's name or %NULL if there are no
 245  *   more entries. The return value is owned by GLib and
 246  *   must not be modified or freed.
 247  **/
 248 const gchar *
 249 g_dir_read_name (GDir *dir)
 250 {
 251 #ifdef G_OS_WIN32
 252   gchar *utf8_name;
 253   struct _wdirent *wentry;
 254 #else
 255   struct dirent *entry;
 256 #endif
 257
 258   g_return_val_if_fail (dir != NULL, NULL);
 259
 260 #ifdef G_OS_WIN32
 261   while (1)
 262     {
 263       wentry = _wreaddir (dir->wdirp);
 264       while (wentry
 265              && (0 == wcscmp (wentry->d_name, L".") ||
 266                  0 == wcscmp (wentry->d_name, L"..")))
 267         wentry = _wreaddir (dir->wdirp);
 268
 269       if (wentry == NULL)
 270         return NULL;
 271
 272       utf8_name = g_utf16_to_utf8 (wentry->d_name, -1, NULL, NULL, NULL);
 273
 274       if (utf8_name == NULL)
 275         continue;               /* Huh, impossible? Skip it anyway */
 276
 277       strcpy (dir->utf8_buf, utf8_name);
 278       g_free (utf8_name);
 279
 280       return dir->utf8_buf;
 281     }
 282 #else
 283   entry = readdir (dir->dirp);
 284   while (entry
 285          && (0 == strcmp (entry->d_name, ".") ||
 286              0 == strcmp (entry->d_name, "..")))
 287     entry = readdir (dir->dirp);
 288
 289   if (entry)
 290     return entry->d_name;
 291   else
 292     return NULL;
 293 #endif
 294 }
 295
 296 #if defined (G_OS_WIN32) && !defined (_WIN64)
 297
 298 /* Ditto for g_dir_read_name */
 299
 300 #undef g_dir_read_name
 301
 302 /* Binary compatibility version. Not for newly compiled code. */
 303
 304 const gchar *
 305 g_dir_read_name (GDir *dir)
 306 {
 307   while (1)
 308     {
 309       const gchar *utf8_name = g_dir_read_name_utf8 (dir);
 310       gchar *retval;
 311
 312       if (utf8_name == NULL)
 313         return NULL;
 314
 315       retval = g_locale_from_utf8 (utf8_name, -1, NULL, NULL, NULL);
 316
 317       if (retval != NULL)
 318         {
 319           strcpy (dir->utf8_buf, retval);
 320           g_free (retval);
 321
 322           return dir->utf8_buf;
 323         }
 324     }
 325 }
 326
 327 #endif
 328
 329 /**
 330  * g_dir_rewind:
 331  * @dir: a #GDir* created by g_dir_open()
 332  *
 333  * Resets the given directory. The next call to g_dir_read_name()
 334  * will return the first entry again.
 335  **/
 336 void
 337 g_dir_rewind (GDir *dir)
 338 {
 339   g_return_if_fail (dir != NULL);
 340
 341 #ifdef G_OS_WIN32
 342   _wrewinddir (dir->wdirp);
 343 #else
 344   rewinddir (dir->dirp);
 345 #endif
 346 }
 347
 348 /**
 349  * g_dir_close:
 350  * @dir: a #GDir* created by g_dir_open()
 351  *
 352  * Closes the directory and deallocates all related resources.
 353  **/
 354 void
 355 g_dir_close (GDir *dir)
 356 {
 357   g_return_if_fail (dir != NULL);
 358
 359 #ifdef G_OS_WIN32
 360   _wclosedir (dir->wdirp);
 361 #else
 362   closedir (dir->dirp);
 363 #endif
 364   g_free (dir);
 365 }