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/*
File: __libobj.c
(Linux Access Control List Management)
Copyright (C) 1999-2002
Andreas Gruenbacher, <andreas.gruenbacher@gmail.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This program 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <errno.h>
#include <stdlib.h>
#include "libobj.h"
#ifdef LIBACL_DEBUG
# include <stdio.h>
#endif
/* object creation, destruction, conversion and validation */
void *
__new_var_obj_p(int magic, size_t size)
{
obj_prefix *obj_p = (obj_prefix *)malloc(size);
if (obj_p) {
obj_p->p_magic = (long)magic;
obj_p->p_flags = OBJ_MALLOC_FLAG;
}
return obj_p;
}
void
__new_obj_p_here(int magic, void *here)
{
obj_prefix *obj_p = here;
obj_p->p_magic = (long)magic;
obj_p->p_flags = 0;
}
void
__free_obj_p(obj_prefix *obj_p)
{
obj_p->p_magic = 0;
if (obj_p->p_flags & OBJ_MALLOC_FLAG)
free(obj_p);
}
obj_prefix *
__check_obj_p(obj_prefix *obj_p, int magic)
{
if (!obj_p || obj_p->p_magic != (long)magic) {
errno = EINVAL;
return NULL;
}
return obj_p;
}
#ifdef LIBACL_DEBUG
obj_prefix *
__ext2int_and_check(void *ext_p, int magic, const char *typename)
#else
obj_prefix *
__ext2int_and_check(void *ext_p, int magic)
#endif
{
obj_prefix *obj_p = ((obj_prefix *)ext_p)-1;
if (!ext_p) {
#ifdef LIBACL_DEBUG
fprintf(stderr, "invalid %s object at %p\n",
typename, obj_p);
#endif
errno = EINVAL;
return NULL;
}
return __check_obj_p(obj_p, magic);
}
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