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  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the
  20  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  21  * Boston, MA 02111-1307, USA.
  22  */
  23
  24 #include "config.h"
  25
  26 #include <errno.h>
  27 #include <string.h> /* strcmp */
  28
  29 #ifdef HAVE_DIRENT_H
  30 #include <sys/types.h>
  31 #include <dirent.h>
  32 #endif
  33
  34 #include "glib.h"
  35 #include "gdir.h"
  36
  37 #include "glibintl.h"
  38
  39 struct _GDir
  40 {
  41   DIR *dir;
  42 };
  43
  44 /**
  45  * g_dir_open:
  46  * @path: the path to the directory you are interested in
  47  * @flags: Currently must be set to 0. Reserved for future use.
  48  * @error: return location for a #GError, or %NULL.
  49  *         If non-%NULL, an error will be set if and only if
  50  *         g_dir_open_fails.
  51  *
  52  * Opens a directory for reading. The names of the files
  53  * in the directory can then be retrieved using
  54  * g_dir_read_name().
  55  *
  56  * Return value: a newly allocated #GDir on success, %NULL on failure.
  57  *   If non-%NULL, you must free the result with g_dir_close()
  58  *   when you are finished with it.
  59  **/
  60 GDir *
  61 g_dir_open (const gchar  *path,
  62             guint         flags,
  63             GError      **error)
  64 {
  65   GDir *dir;
  66
  67   g_return_val_if_fail (path != NULL, NULL);
  68
  69   dir = g_new (GDir, 1);
  70
  71   dir->dir = opendir (path);
  72
  73   if (dir->dir)
  74     return dir;
  75
  76   /* error case */
  77   g_set_error (error,
  78                G_FILE_ERROR,
  79                g_file_error_from_errno (errno),
  80                _("Error opening directory '%s': %s"),
  81                path, g_strerror (errno));
  82
  83   g_free (dir);
  84   return NULL;
  85 }
  86
  87 /**
  88  * g_dir_read_name:
  89  * @dir: a #GDir* created by g_dir_open()
  90  *
  91  * Retrieves the name of the next entry in the directory.
  92  * The '.' and '..' entries are omitted. The returned name is in
  93  * the encoding used for filenames. Use g_filename_to_utf8() to
  94  * convert it to UTF-8.
  95  *
  96  * Return value: The entries name or %NULL if there are no
  97  *   more entries. The return value is owned by GLib and
  98  *   must not be modified or freed.
  99  **/
 100 G_CONST_RETURN gchar*
 101 g_dir_read_name (GDir *dir)
 102 {
 103   struct dirent *entry;
 104
 105   g_return_val_if_fail (dir != NULL, NULL);
 106
 107   entry = readdir (dir->dir);
 108   while (entry
 109          && (0 == strcmp (entry->d_name, ".") ||
 110              0 == strcmp (entry->d_name, "..")))
 111     entry = readdir (dir->dir);
 112
 113   if (entry)
 114     return entry->d_name;
 115   else
 116     return NULL;
 117 }
 118
 119 /**
 120  * g_dir_rewind:
 121  * @dir: a #GDir* created by g_dir_open()
 122  *
 123  * Resets the given directory. The next call to g_dir_read_name()
 124  * will return the first entry again.
 125  **/
 126 void
 127 g_dir_rewind (GDir *dir)
 128 {
 129   g_return_if_fail (dir != NULL);
 130
 131   rewinddir (dir->dir);
 132 }
 133
 134 /**
 135  * g_dir_close:
 136  * @dir: a #GDir* created by g_dir_open()
 137  *
 138  * Closes the directory and deallocates all related resources.
 139  **/
 140 void
 141 g_dir_close (GDir *dir)
 142 {
 143   g_return_if_fail (dir != NULL);
 144
 145   closedir (dir->dir);
 146   g_free (dir);
 147 }