1/* $FreeBSD$ */
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2012 SRI International
7 * Copyright (c) 1992, 1993
8 *	The Regents of the University of California.  All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#ifndef _LIBNETBSD_SYS_CDEFS_H_
36#define _LIBNETBSD_SYS_CDEFS_H_
37
38#include_next <sys/cdefs.h>
39
40#ifndef __dead
41#ifdef __dead2
42#define __dead __dead2
43#else
44#define __dead
45#endif
46#endif /* !__dead */
47
48/*
49 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
50 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
51 * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
52 * in between its arguments.  __CONCAT can also concatenate double-quoted
53 * strings produced by the __STRING macro, but this only works with ANSI C.
54 */
55
56#define	___STRING(x)	__STRING(x)
57#define	___CONCAT(x,y)	__CONCAT(x,y)
58
59/*
60 * The following macro is used to remove const cast-away warnings
61 * from gcc -Wcast-qual; it should be used with caution because it
62 * can hide valid errors; in particular most valid uses are in
63 * situations where the API requires it, not to cast away string
64 * constants. We don't use *intptr_t on purpose here and we are
65 * explicit about unsigned long so that we don't have additional
66 * dependencies.
67 */
68#define __UNCONST(a)	((void *)(unsigned long)(const void *)(a))
69
70/*
71 * Return the number of elements in a statically-allocated array,
72 * __x.
73 */
74#define	__arraycount(__x)	(sizeof(__x) / sizeof(__x[0]))
75
76/* __BIT(n): nth bit, where __BIT(0) == 0x1. */
77#define	__BIT(__n)	\
78    (((uintmax_t)(__n) >= NBBY * sizeof(uintmax_t)) ? 0 : \
79    ((uintmax_t)1 << (uintmax_t)((__n) & (NBBY * sizeof(uintmax_t) - 1))))
80
81/* __BITS(m, n): bits m through n, m < n. */
82#define	__BITS(__m, __n)	\
83	((__BIT(MAX((__m), (__n)) + 1) - 1) ^ (__BIT(MIN((__m), (__n))) - 1))
84
85#endif /* _LIBNETBSD_SYS_CDEFS_H_ */
86