freebsd-dev/lib/libc/posix1e/acl_delete_entry.c

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/*
* Copyright (c) 2001-2002 Chris D. Faulhaber
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include "namespace.h"
#include <sys/acl.h>
#include "un-namespace.h"
#include <errno.h>
#include <string.h>
/*
* acl_delete_entry() (23.4.9): remove the ACL entry indicated by entry_d
* from acl.
*/
int
acl_delete_entry(acl_t acl, acl_entry_t entry_d)
{
struct acl *acl_int;
int i;
if (acl == NULL || entry_d == NULL) {
errno = EINVAL;
return (-1);
}
acl_int = &acl->ats_acl;
if ((acl->ats_acl.acl_cnt < 1) ||
(acl->ats_acl.acl_cnt > ACL_MAX_ENTRIES)) {
errno = EINVAL;
return (-1);
}
for (i = 0; i < acl->ats_acl.acl_cnt; i++) {
/* if this is our entry... */
if ((acl->ats_acl.acl_entry[i].ae_tag == entry_d->ae_tag) &&
(acl->ats_acl.acl_entry[i].ae_id == entry_d->ae_id)) {
/* ...shift the remaining entries... */
for (; i < acl->ats_acl.acl_cnt - 1; ++i)
acl->ats_acl.acl_entry[i] =
acl->ats_acl.acl_entry[i+1];
/* ...drop the count and zero the unused entry... */
acl->ats_acl.acl_cnt--;
bzero(&acl->ats_acl.acl_entry[i],
sizeof(struct acl_entry));
acl->ats_cur_entry = 0;
return (0);
}
}
errno = EINVAL;
return (-1);
}