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, write to the
  21  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22  * Boston, MA 02111-1307, USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <stdio.h>
  30 #include <sys/stat.h>
  31
  32 #ifdef HAVE_DIRENT_H
  33 #include <sys/types.h>
  34 #include <dirent.h>
  35 #endif
  36
  37 #include "gdir.h"
  38
  39 #include "gconvert.h"
  40 #include "gfileutils.h"
  41 #include "gstrfuncs.h"
  42 #include "gtestutils.h"
  43 #include "glibintl.h"
  44
  45
  46 #if defined (_MSC_VER) && !defined (HAVE_DIRENT_H)
  47 #include "../build/win32/dirent/dirent.h"
  48 #include "../build/win32/dirent/wdirent.c"
  49 #endif
  50
  51 struct _GDir
  52 {
  53 #ifdef G_OS_WIN32
  54   _WDIR *wdirp;
  55 #else
  56   DIR *dirp;
  57 #endif
  58 #ifdef G_OS_WIN32
  59   gchar utf8_buf[FILENAME_MAX*4];
  60 #endif
  61 };
  62
  63 /**
  64  * g_dir_open:
  65  * @path: the path to the directory you are interested in. On Unix
  66  *         in the on-disk encoding. On Windows in UTF-8
  67  * @flags: Currently must be set to 0. Reserved for future use.
  68  * @error: return location for a #GError, or %NULL.
  69  *         If non-%NULL, an error will be set if and only if
  70  *         g_dir_open() fails.
  71  *
  72  * Opens a directory for reading. The names of the files in the
  73  * directory can then be retrieved using g_dir_read_name().  Note
  74  * that the ordering is not defined.
  75  *
  76  * Return value: a newly allocated #GDir on success, %NULL on failure.
  77  *   If non-%NULL, you must free the result with g_dir_close()
  78  *   when you are finished with it.
  79  **/
  80 GDir *
  81 g_dir_open (const gchar  *path,
  82             guint         flags,
  83             GError      **error)
  84 {
  85   GDir *dir;
  86   int errsv;
  87 #ifdef G_OS_WIN32
  88   wchar_t *wpath;
  89 #else
  90   gchar *utf8_path;
  91 #endif
  92
  93   g_return_val_if_fail (path != NULL, NULL);
  94
  95 #ifdef G_OS_WIN32
  96   wpath = g_utf8_to_utf16 (path, -1, NULL, NULL, error);
  97
  98   if (wpath == NULL)
  99     return NULL;
 100
 101   dir = g_new (GDir, 1);
 102
 103   dir->wdirp = _wopendir (wpath);
 104   g_free (wpath);
 105
 106   if (dir->wdirp)
 107     return dir;
 108
 109   /* error case */
 110   errsv = errno;
 111
 112   g_set_error (error,
 113                G_FILE_ERROR,
 114                g_file_error_from_errno (errsv),
 115                _("Error opening directory '%s': %s"),
 116                path, g_strerror (errsv));
 117
 118   g_free (dir);
 119
 120   return NULL;
 121 #else
 122   dir = g_new (GDir, 1);
 123
 124   dir->dirp = opendir (path);
 125
 126   if (dir->dirp)
 127     return dir;
 128
 129   /* error case */
 130   errsv = errno;
 131
 132   utf8_path = g_filename_to_utf8 (path, -1,
 133                                   NULL, NULL, NULL);
 134
 135   g_set_error (error,
 136                G_FILE_ERROR,
 137                g_file_error_from_errno (errsv),
 138                _("Error opening directory '%s': %s"),
 139                utf8_path, g_strerror (errsv));
 140
 141   g_free (utf8_path);
 142   g_free (dir);
 143
 144   return NULL;
 145 #endif
 146 }
 147
 148 #if defined (G_OS_WIN32) && !defined (_WIN64)
 149
 150 /* The above function actually is called g_dir_open_utf8, and it's
 151  * that what applications compiled with this GLib version will
 152  * use.
 153  */
 154
 155 #undef g_dir_open
 156
 157 /* Binary compatibility version. Not for newly compiled code. */
 158
 159 GDir *
 160 g_dir_open (const gchar  *path,
 161             guint         flags,
 162             GError      **error)
 163 {
 164   gchar *utf8_path = g_locale_to_utf8 (path, -1, NULL, NULL, error);
 165   GDir *retval;
 166
 167   if (utf8_path == NULL)
 168     return NULL;
 169
 170   retval = g_dir_open_utf8 (utf8_path, flags, error);
 171
 172   g_free (utf8_path);
 173
 174   return retval;
 175 }
 176 #endif
 177
 178 /**
 179  * g_dir_read_name:
 180  * @dir: a #GDir* created by g_dir_open()
 181  *
 182  * Retrieves the name of another entry in the directory, or %NULL.
 183  * The order of entries returned from this function is not defined,
 184  * and may vary by file system or other operating-system dependent
 185  * factors.
 186  *
 187  * On Unix, the '.' and '..' entries are omitted, and the returned
 188  * name is in the on-disk encoding.
 189  *
 190  * On Windows, as is true of all GLib functions which operate on
 191  * filenames, the returned name is in UTF-8.
 192  *
 193  * Return value: The entry's name or %NULL if there are no
 194  *   more entries. The return value is owned by GLib and
 195  *   must not be modified or freed.
 196  **/
 197 G_CONST_RETURN gchar*
 198 g_dir_read_name (GDir *dir)
 199 {
 200 #ifdef G_OS_WIN32
 201   gchar *utf8_name;
 202   struct _wdirent *wentry;
 203 #else
 204   struct dirent *entry;
 205 #endif
 206
 207   g_return_val_if_fail (dir != NULL, NULL);
 208
 209 #ifdef G_OS_WIN32
 210   while (1)
 211     {
 212       wentry = _wreaddir (dir->wdirp);
 213       while (wentry
 214              && (0 == wcscmp (wentry->d_name, L".") ||
 215                  0 == wcscmp (wentry->d_name, L"..")))
 216         wentry = _wreaddir (dir->wdirp);
 217
 218       if (wentry == NULL)
 219         return NULL;
 220
 221       utf8_name = g_utf16_to_utf8 (wentry->d_name, -1, NULL, NULL, NULL);
 222
 223       if (utf8_name == NULL)
 224         continue;               /* Huh, impossible? Skip it anyway */
 225
 226       strcpy (dir->utf8_buf, utf8_name);
 227       g_free (utf8_name);
 228
 229       return dir->utf8_buf;
 230     }
 231 #else
 232   entry = readdir (dir->dirp);
 233   while (entry
 234          && (0 == strcmp (entry->d_name, ".") ||
 235              0 == strcmp (entry->d_name, "..")))
 236     entry = readdir (dir->dirp);
 237
 238   if (entry)
 239     return entry->d_name;
 240   else
 241     return NULL;
 242 #endif
 243 }
 244
 245 #if defined (G_OS_WIN32) && !defined (_WIN64)
 246
 247 /* Ditto for g_dir_read_name */
 248
 249 #undef g_dir_read_name
 250
 251 /* Binary compatibility version. Not for newly compiled code. */
 252
 253 G_CONST_RETURN gchar*
 254 g_dir_read_name (GDir *dir)
 255 {
 256   while (1)
 257     {
 258       const gchar *utf8_name = g_dir_read_name_utf8 (dir);
 259       gchar *retval;
 260
 261       if (utf8_name == NULL)
 262         return NULL;
 263
 264       retval = g_locale_from_utf8 (utf8_name, -1, NULL, NULL, NULL);
 265
 266       if (retval != NULL)
 267         {
 268           strcpy (dir->utf8_buf, retval);
 269           g_free (retval);
 270
 271           return dir->utf8_buf;
 272         }
 273     }
 274 }
 275
 276 #endif
 277
 278 /**
 279  * g_dir_rewind:
 280  * @dir: a #GDir* created by g_dir_open()
 281  *
 282  * Resets the given directory. The next call to g_dir_read_name()
 283  * will return the first entry again.
 284  **/
 285 void
 286 g_dir_rewind (GDir *dir)
 287 {
 288   g_return_if_fail (dir != NULL);
 289
 290 #ifdef G_OS_WIN32
 291   _wrewinddir (dir->wdirp);
 292 #else
 293   rewinddir (dir->dirp);
 294 #endif
 295 }
 296
 297 /**
 298  * g_dir_close:
 299  * @dir: a #GDir* created by g_dir_open()
 300  *
 301  * Closes the directory and deallocates all related resources.
 302  **/
 303 void
 304 g_dir_close (GDir *dir)
 305 {
 306   g_return_if_fail (dir != NULL);
 307
 308 #ifdef G_OS_WIN32
 309   _wclosedir (dir->wdirp);
 310 #else
 311   closedir (dir->dirp);
 312 #endif
 313   g_free (dir);
 314 }