1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#include <errno.h>
27#include <libgen.h>
28#include <libintl.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <strings.h>
32#include <ctype.h>
33
34#include "zpool_util.h"
35
36/*
37 * Utility function to guarantee malloc() success.
38 */
39void *
40safe_malloc(size_t size)
41{
42	void *data;
43
44	if ((data = calloc(1, size)) == NULL) {
45		(void) fprintf(stderr, "internal error: out of memory\n");
46		exit(1);
47	}
48
49	return (data);
50}
51
52/*
53 * Display an out of memory error message and abort the current program.
54 */
55void
56zpool_no_memory(void)
57{
58	assert(errno == ENOMEM);
59	(void) fprintf(stderr,
60	    gettext("internal error: out of memory\n"));
61	exit(1);
62}
63
64/*
65 * Return the number of logs in supplied nvlist
66 */
67uint_t
68num_logs(nvlist_t *nv)
69{
70	uint_t nlogs = 0;
71	uint_t c, children;
72	nvlist_t **child;
73
74	if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN,
75	    &child, &children) != 0)
76		return (0);
77
78	for (c = 0; c < children; c++) {
79		uint64_t is_log = B_FALSE;
80
81		(void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_LOG,
82		    &is_log);
83		if (is_log)
84			nlogs++;
85	}
86	return (nlogs);
87}
88
89/* Find the max element in an array of uint64_t values */
90uint64_t
91array64_max(uint64_t array[], unsigned int len)
92{
93	uint64_t max = 0;
94	int i;
95	for (i = 0; i < len; i++)
96		max = MAX(max, array[i]);
97
98	return (max);
99}
100
101/*
102 * Find highest one bit set.
103 * Returns bit number + 1 of highest bit that is set, otherwise returns 0.
104 */
105int
106highbit64(uint64_t i)
107{
108	if (i == 0)
109		return (0);
110
111	return (NBBY * sizeof (uint64_t) - __builtin_clzll(i));
112}
113
114/*
115 * Find lowest one bit set.
116 * Returns bit number + 1 of lowest bit that is set, otherwise returns 0.
117 */
118int
119lowbit64(uint64_t i)
120{
121	if (i == 0)
122		return (0);
123
124	return (__builtin_ffsll(i));
125}
126