subr_dnvlist.c revision 292973 
1/*-
2 * Copyright (c) 2013 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Pawel Jakub Dawidek under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: stable/10/sys/kern/subr_dnvlist.c 292973 2015-12-31 03:28:14Z ngie $");
32
33#ifdef _KERNEL
34
35#include <sys/types.h>
36#include <sys/param.h>
37#include <sys/kernel.h>
38#include <sys/systm.h>
39#include <sys/malloc.h>
40
41#include <machine/stdarg.h>
42
43#else
44#include <stdarg.h>
45#include <stdbool.h>
46#include <stdint.h>
47#include <stdlib.h>
48#endif
49
50#include <sys/nv.h>
51#include <sys/nv_impl.h>
52
53#include <sys/dnv.h>
54
55#define	DNVLIST_GET(ftype, type)					\
56ftype									\
57dnvlist_get_##type(const nvlist_t *nvl, const char *name, ftype defval)	\
58{									\
59									\
60	if (nvlist_exists_##type(nvl, name))				\
61		return (nvlist_get_##type(nvl, name));			\
62	else								\
63		return (defval);					\
64}
65
66DNVLIST_GET(bool, bool)
67DNVLIST_GET(uint64_t, number)
68DNVLIST_GET(const char *, string)
69DNVLIST_GET(const nvlist_t *, nvlist)
70#ifndef _KERNEL
71DNVLIST_GET(int, descriptor)
72#endif
73
74#undef	DNVLIST_GET
75
76const void *
77dnvlist_get_binary(const nvlist_t *nvl, const char *name, size_t *sizep,
78    const void *defval, size_t defsize)
79{
80	const void *value;
81
82	if (nvlist_exists_binary(nvl, name))
83		value = nvlist_get_binary(nvl, name, sizep);
84	else {
85		if (sizep != NULL)
86			*sizep = defsize;
87		value = defval;
88	}
89	return (value);
90}
91
92#define	DNVLIST_TAKE(ftype, type)					\
93ftype									\
94dnvlist_take_##type(nvlist_t *nvl, const char *name, ftype defval)	\
95{									\
96									\
97	if (nvlist_exists_##type(nvl, name))				\
98		return (nvlist_take_##type(nvl, name));			\
99	else								\
100		return (defval);					\
101}
102
103DNVLIST_TAKE(bool, bool)
104DNVLIST_TAKE(uint64_t, number)
105DNVLIST_TAKE(char *, string)
106DNVLIST_TAKE(nvlist_t *, nvlist)
107#ifndef _KERNEL
108DNVLIST_TAKE(int, descriptor)
109#endif
110
111#undef	DNVLIST_TAKE
112
113void *
114dnvlist_take_binary(nvlist_t *nvl, const char *name, size_t *sizep,
115    void *defval, size_t defsize)
116{
117	void *value;
118
119	if (nvlist_exists_binary(nvl, name))
120		value = nvlist_take_binary(nvl, name, sizep);
121	else {
122		if (sizep != NULL)
123			*sizep = defsize;
124		value = defval;
125	}
126	return (value);
127}
128
129