1 files changed, 143 insertions, 0 deletions
diff --git a/cpukit/libfs/src/imfs/imfs_dir_default.c b/cpukit/libfs/src/imfs/imfs_dir_default.c
new file mode 100644
index 0000000000..98f06dfce4
--- /dev/null
+++ b/cpukit/libfs/src/imfs/imfs_dir_default.c
@@ -0,0 +1,143 @@
+/**
+ * @file
+ *
+ * @ingroup IMFS
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-1999.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include "imfs.h"
+
+#include <dirent.h>
+#include <string.h>
+
+static ssize_t IMFS_dir_read(
+  rtems_libio_t  *iop,
+  void           *buffer,
+  size_t          count
+)
+{
+  /*
+   *  Read up to element  iop->offset in the directory chain of the
+   *  imfs_jnode_t struct for this file descriptor.
+   */
+   const IMFS_directory_t    *dir;
+   const rtems_chain_node    *node;
+   const rtems_chain_control *entries;
+   struct dirent             *dir_ent;
+   ssize_t                    bytes_transferred;
+   off_t                      current_entry;
+   off_t                      first_entry;
+   off_t                      last_entry;
+
+   rtems_filesystem_instance_lock( &iop->pathinfo );
+
+   dir = IMFS_iop_to_directory( iop );
+   entries = &dir->Entries;
+
+   /* Move to the first of the desired directory entries */
+
+   bytes_transferred = 0;
+   first_entry = iop->offset;
+   /* protect against using sizes that are not exact multiples of the */
+   /* -dirent- size. These could result in unexpected results          */
+   last_entry = first_entry
+     + (count / sizeof( *dir_ent )) * sizeof( *dir_ent );
+
+   /* The directory was not empty so try to move to the desired entry in chain*/
+   for (
+      current_entry = 0,
+        node = rtems_chain_immutable_first( entries );
+      current_entry < last_entry
+        && !rtems_chain_is_tail( entries, node );
+      current_entry +=  sizeof( *dir_ent ),
+        node = rtems_chain_immutable_next( node )
+   ) {
+      if( current_entry >= first_entry ) {
+         const IMFS_jnode_t *imfs_node = (const IMFS_jnode_t *) node;
+
+         dir_ent = (struct dirent *) ((char *) buffer + bytes_transferred);
+
+         /* Move the entry to the return buffer */
+         dir_ent->d_off = current_entry;
+         dir_ent->d_reclen = sizeof( *dir_ent );
+         dir_ent->d_ino = IMFS_node_to_ino( imfs_node );
+         dir_ent->d_namlen = strlen( imfs_node->name );
+         memcpy( dir_ent->d_name, imfs_node->name, dir_ent->d_namlen + 1 );
+
+         iop->offset += sizeof( *dir_ent );
+         bytes_transferred += (ssize_t) sizeof( *dir_ent );
+      }
+   }
+
+   rtems_filesystem_instance_unlock( &iop->pathinfo );
+
+   return bytes_transferred;
+}
+
+static size_t IMFS_directory_size( const IMFS_jnode_t *node )
+{
+  size_t size = 0;
+  const IMFS_directory_t *dir = (const IMFS_directory_t *) node;
+  const rtems_chain_control *chain = &dir->Entries;
+  const rtems_chain_node *current = rtems_chain_immutable_first( chain );
+  const rtems_chain_node *tail = rtems_chain_immutable_tail( chain );
+
+  while ( current != tail ) {
+    size += sizeof( struct dirent );
+    current = rtems_chain_immutable_next( current );
+  }
+
+  return size;
+}
+
+static int IMFS_stat_directory(
+  const rtems_filesystem_location_info_t *loc,
+  struct stat *buf
+)
+{
+  const IMFS_jnode_t *node = loc->node_access;
+
+  buf->st_size = IMFS_directory_size( node );
+
+  return IMFS_stat( loc, buf );
+}
+
+static const rtems_filesystem_file_handlers_r IMFS_dir_default_handlers = {
+  .open_h = rtems_filesystem_default_open,
+  .close_h = rtems_filesystem_default_close,
+  .read_h = IMFS_dir_read,
+  .write_h = rtems_filesystem_default_write,
+  .ioctl_h = rtems_filesystem_default_ioctl,
+  .lseek_h = rtems_filesystem_default_lseek_directory,
+  .fstat_h = IMFS_stat_directory,
+  .ftruncate_h = rtems_filesystem_default_ftruncate_directory,
+  .fsync_h = rtems_filesystem_default_fsync_or_fdatasync_success,
+  .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync_success,
+  .fcntl_h = rtems_filesystem_default_fcntl,
+  .kqfilter_h = rtems_filesystem_default_kqfilter,
+  .poll_h = rtems_filesystem_default_poll,
+  .readv_h = rtems_filesystem_default_readv,
+  .writev_h = rtems_filesystem_default_writev
+};
+
+const IMFS_mknod_control IMFS_mknod_control_dir_default = {
+  {
+    .handlers = &IMFS_dir_default_handlers,
+    .node_initialize = IMFS_node_initialize_directory,
+    .node_remove = IMFS_node_remove_directory,
+    .node_destroy = IMFS_node_destroy_default
+  },
+  .node_size = sizeof( IMFS_directory_t )
+};