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      1 /*-
      2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      3  *
      4  * Copyright (c) 1999, 2000, 2001 Robert N. M. Watson
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 /*
     29  * acl_init -- return a fresh acl structure
     30  * acl_dup -- duplicate an acl and return the new copy
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 #if 0
     35 __FBSDID("$FreeBSD: head/lib/libc/posix1e/acl_init.c 326193 2017-11-25 17:12:48Z pfg $");
     36 #else
     37 __RCSID("$NetBSD: acl_init.c,v 1.1 2020/05/16 18:31:47 christos Exp $");
     38 #endif
     39 
     40 #include "namespace.h"
     41 #include <sys/types.h>
     42 #include <sys/acl.h>
     43 #include <errno.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <assert.h>
     47 
     48 #include "acl_support.h"
     49 
     50 __CTASSERT(1 << _ACL_T_ALIGNMENT_BITS > sizeof(struct acl_t_struct));
     51 
     52 acl_t
     53 acl_init(int count)
     54 {
     55 	int error;
     56 	acl_t acl;
     57 
     58 	if (count > ACL_MAX_ENTRIES) {
     59 		errno = ENOMEM;
     60 		return (NULL);
     61 	}
     62 	if (count < 0) {
     63 		errno = EINVAL;
     64 		return (NULL);
     65 	}
     66 
     67 	error = posix_memalign((void *)&acl, 1 << _ACL_T_ALIGNMENT_BITS,
     68 	    sizeof(struct acl_t_struct));
     69 	if (error) {
     70 		errno = error;
     71 		return (NULL);
     72 	}
     73 
     74 	bzero(acl, sizeof(struct acl_t_struct));
     75 	acl->ats_brand = ACL_BRAND_UNKNOWN;
     76 	acl->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES;
     77 
     78 	return (acl);
     79 }
     80 
     81 acl_t
     82 acl_dup(acl_t acl)
     83 {
     84 	acl_t	acl_new;
     85 
     86 	acl_new = acl_init(ACL_MAX_ENTRIES);
     87 	if (acl_new != NULL) {
     88 		*acl_new = *acl;
     89 		acl->ats_cur_entry = 0;
     90 		acl_new->ats_cur_entry = 0;
     91 	}
     92 
     93 	return (acl_new);
     94 }
     95