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/* Low-level directory manipulation functions
Copyright (C) 1995 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Low level dir management routines. If called on a non-dir, ENOTDIR is
returned. */
/* Add CHILD to DIR as NAME, replacing any existing entry. If OLD_CHILD is
NULL, and NAME already exists in dir, EEXIST is returned, otherwise, any
previous child is replaced and returned in OLD_CHILD. DIR should be
locked. */
error_t
treefs_mdir_add (struct treefs_node *dir, char *name,
struct treefs_node *child, struct treefs_node **old_child)
{
if (!treefs_node_isdir (dir))
return ENOTDIR;
else
{
if (dir->children == NULL)
{
dir->children = treefs_make_node_list ();
if (dir->children == NULL)
return ENOMEM;
}
return treefs_node_list_add (dir->children, name, child, old_child);
}
}
/* Remove any entry in DIR called NAME. If there is no such entry, ENOENT is
returned. If OLD_CHILD is non-NULL, any removed entry is returned in it.
DIR should be locked. */
error_t
treefs_mdir_remove (struct treefs_node *dir, char *name,
struct treefs_node *old_child)
{
if (!treefs_node_isdir (dir))
return ENOTDIR;
else if (dir->children == NULL)
/* Normally this shouldn't happen. */
return ENOENT;
else
return treefs_node_list_remove (dir->children, name, old_child);
}
/* Returns in CHILD any entry called NAME in DIR, or NULL (and ENOENT) if
there isn't such. DIR should be locked. */
error_t
treefs_mdir_get (struct treefs_node *dir, char *name,
struct treefs_node **child)
{
if (!treefs_node_isdir (dir))
return ENOTDIR;
else if (dir->children == NULL)
/* Normally this shouldn't happen. */
return ENOENT;
else
return treefs_node_list_get (dir->children, name, child);
}
/* Call FUN on each child of DIR; if FUN returns a non-zero value at any
point, stop iterating and return that value immediately. */
error_t
treefs_mdir_for_each (struct treefs_node *dir,
error_t (*fun)(char *name, struct treefs_node *child))
{
if (!treefs_node_isdir (dir))
return ENOTDIR;
else if (dir->children == NULL)
/* Normally this shouldn't happen. */
return 0;
else
return treefs_node_list_for_each (dir->children, fun);
}
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