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/* Functions for manipulating hook vectors.
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. */
#include "treefs.h"
#define HV_SIZE (sizeof (void (*)()) * TREEFS_NUM_HOOKS)
/* Returns a copy of the treefs hook vector HOOKS, or a zero'd vector if HOOKS
is NULL. If HOOKS is NULL, treefs_default_hooks is used. If a memory
allocation error occurs, NULL is returned. */
treefs_hook_vector_t
treefs_hooks_clone (treefs_hook_vector_t hooks)
{
treefs_hook_vector_t clone = malloc (HV_SIZE);
if (clone != NULL)
{
if (hooks == NULL)
hooks = treefs_default_hooks;
bcopy (hooks, clone, HV_SIZE);
}
return clone;
}
/* Copies each non-NULL entry in OVERRIDES into HOOKS. */
void
treefs_hooks_override (treefs_hook_vector_t hooks,
treefs_hook_vector_t overrides)
{
int num;
for (num = 0; num < TREEFS_NUM_HOOKS; num++)
if (overrides[num] != NULL)
hooks[num] = overrides[num];
}
/* Sets the hook NUM in HOOKS to HOOK. */
void
treefs_hooks_set (treefs_hook_vector_t hooks, unsigned num, void (*hook)())
{
hooks[num] = hook;
}
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