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 /**
  52  * GDir:
  53  *
  54  * An opaque structure representing an opened directory.
  55  */
  56
  57 struct _GDir
  58 {
  59 #ifdef G_OS_WIN32
  60   _WDIR *wdirp;
  61 #else
  62   DIR *dirp;
  63 #endif
  64 #ifdef G_OS_WIN32
  65   gchar utf8_buf[FILENAME_MAX*4];
  66 #endif
  67 };
  68
  69 /**
  70  * g_dir_open:
  71  * @path: the path to the directory you are interested in. On Unix
  72  *         in the on-disk encoding. On Windows in UTF-8
  73  * @flags: Currently must be set to 0. Reserved for future use.
  74  * @error: return location for a #GError, or %NULL.
  75  *         If non-%NULL, an error will be set if and only if
  76  *         g_dir_open() fails.
  77  *
  78  * Opens a directory for reading. The names of the files in the
  79  * directory can then be retrieved using g_dir_read_name().  Note
  80  * that the ordering is not defined.
  81  *
  82  * Return value: a newly allocated #GDir on success, %NULL on failure.
  83  *   If non-%NULL, you must free the result with g_dir_close()
  84  *   when you are finished with it.
  85  **/
  86 GDir *
  87 g_dir_open (const gchar  *path,
  88             guint         flags,
  89             GError      **error)
  90 {
  91   GDir *dir;
  92   int errsv;
  93 #ifdef G_OS_WIN32
  94   wchar_t *wpath;
  95 #else
  96   gchar *utf8_path;
  97 #endif
  98
  99   g_return_val_if_fail (path != NULL, NULL);
 100
 101 #ifdef G_OS_WIN32
 102   wpath = g_utf8_to_utf16 (path, -1, NULL, NULL, error);
 103
 104   if (wpath == NULL)
 105     return NULL;
 106
 107   dir = g_new (GDir, 1);
 108
 109   dir->wdirp = _wopendir (wpath);
 110   g_free (wpath);
 111
 112   if (dir->wdirp)
 113     return dir;
 114
 115   /* error case */
 116   errsv = errno;
 117
 118   g_set_error (error,
 119                G_FILE_ERROR,
 120                g_file_error_from_errno (errsv),
 121                _("Error opening directory '%s': %s"),
 122                path, g_strerror (errsv));
 123
 124   g_free (dir);
 125
 126   return NULL;
 127 #else
 128   dir = g_new (GDir, 1);
 129
 130   dir->dirp = opendir (path);
 131
 132   if (dir->dirp)
 133     return dir;
 134
 135   /* error case */
 136   errsv = errno;
 137
 138   utf8_path = g_filename_to_utf8 (path, -1,
 139                                   NULL, NULL, NULL);
 140
 141   g_set_error (error,
 142                G_FILE_ERROR,
 143                g_file_error_from_errno (errsv),
 144                _("Error opening directory '%s': %s"),
 145                utf8_path, g_strerror (errsv));
 146
 147   g_free (utf8_path);
 148   g_free (dir);
 149
 150   return NULL;
 151 #endif
 152 }
 153
 154 #if defined (G_OS_WIN32) && !defined (_WIN64)
 155
 156 /* The above function actually is called g_dir_open_utf8, and it's
 157  * that what applications compiled with this GLib version will
 158  * use.
 159  */
 160
 161 #undef g_dir_open
 162
 163 /* Binary compatibility version. Not for newly compiled code. */
 164
 165 GDir *
 166 g_dir_open (const gchar  *path,
 167             guint         flags,
 168             GError      **error)
 169 {
 170   gchar *utf8_path = g_locale_to_utf8 (path, -1, NULL, NULL, error);
 171   GDir *retval;
 172
 173   if (utf8_path == NULL)
 174     return NULL;
 175
 176   retval = g_dir_open_utf8 (utf8_path, flags, error);
 177
 178   g_free (utf8_path);
 179
 180   return retval;
 181 }
 182 #endif
 183
 184 /**
 185  * g_dir_read_name:
 186  * @dir: a #GDir* created by g_dir_open()
 187  *
 188  * Retrieves the name of another entry in the directory, or %NULL.
 189  * The order of entries returned from this function is not defined,
 190  * and may vary by file system or other operating-system dependent
 191  * factors.
 192  *
 193  * On Unix, the '.' and '..' entries are omitted, and the returned
 194  * name is in the on-disk encoding.
 195  *
 196  * On Windows, as is true of all GLib functions which operate on
 197  * filenames, the returned name is in UTF-8.
 198  *
 199  * Return value: The entry's name or %NULL if there are no
 200  *   more entries. The return value is owned by GLib and
 201  *   must not be modified or freed.
 202  **/
 203 const gchar *
 204 g_dir_read_name (GDir *dir)
 205 {
 206 #ifdef G_OS_WIN32
 207   gchar *utf8_name;
 208   struct _wdirent *wentry;
 209 #else
 210   struct dirent *entry;
 211 #endif
 212
 213   g_return_val_if_fail (dir != NULL, NULL);
 214
 215 #ifdef G_OS_WIN32
 216   while (1)
 217     {
 218       wentry = _wreaddir (dir->wdirp);
 219       while (wentry
 220              && (0 == wcscmp (wentry->d_name, L".") ||
 221                  0 == wcscmp (wentry->d_name, L"..")))
 222         wentry = _wreaddir (dir->wdirp);
 223
 224       if (wentry == NULL)
 225         return NULL;
 226
 227       utf8_name = g_utf16_to_utf8 (wentry->d_name, -1, NULL, NULL, NULL);
 228
 229       if (utf8_name == NULL)
 230         continue;               /* Huh, impossible? Skip it anyway */
 231
 232       strcpy (dir->utf8_buf, utf8_name);
 233       g_free (utf8_name);
 234
 235       return dir->utf8_buf;
 236     }
 237 #else
 238   entry = readdir (dir->dirp);
 239   while (entry
 240          && (0 == strcmp (entry->d_name, ".") ||
 241              0 == strcmp (entry->d_name, "..")))
 242     entry = readdir (dir->dirp);
 243
 244   if (entry)
 245     return entry->d_name;
 246   else
 247     return NULL;
 248 #endif
 249 }
 250
 251 #if defined (G_OS_WIN32) && !defined (_WIN64)
 252
 253 /* Ditto for g_dir_read_name */
 254
 255 #undef g_dir_read_name
 256
 257 /* Binary compatibility version. Not for newly compiled code. */
 258
 259 const gchar *
 260 g_dir_read_name (GDir *dir)
 261 {
 262   while (1)
 263     {
 264       const gchar *utf8_name = g_dir_read_name_utf8 (dir);
 265       gchar *retval;
 266
 267       if (utf8_name == NULL)
 268         return NULL;
 269
 270       retval = g_locale_from_utf8 (utf8_name, -1, NULL, NULL, NULL);
 271
 272       if (retval != NULL)
 273         {
 274           strcpy (dir->utf8_buf, retval);
 275           g_free (retval);
 276
 277           return dir->utf8_buf;
 278         }
 279     }
 280 }
 281
 282 #endif
 283
 284 /**
 285  * g_dir_rewind:
 286  * @dir: a #GDir* created by g_dir_open()
 287  *
 288  * Resets the given directory. The next call to g_dir_read_name()
 289  * will return the first entry again.
 290  **/
 291 void
 292 g_dir_rewind (GDir *dir)
 293 {
 294   g_return_if_fail (dir != NULL);
 295
 296 #ifdef G_OS_WIN32
 297   _wrewinddir (dir->wdirp);
 298 #else
 299   rewinddir (dir->dirp);
 300 #endif
 301 }
 302
 303 /**
 304  * g_dir_close:
 305  * @dir: a #GDir* created by g_dir_open()
 306  *
 307  * Closes the directory and deallocates all related resources.
 308  **/
 309 void
 310 g_dir_close (GDir *dir)
 311 {
 312   g_return_if_fail (dir != NULL);
 313
 314 #ifdef G_OS_WIN32
 315   _wclosedir (dir->wdirp);
 316 #else
 317   closedir (dir->dirp);
 318 #endif
 319   g_free (dir);
 320 }