cdefs.h revision 313215 
1/* $FreeBSD: stable/10/lib/libnetbsd/sys/cdefs.h 313215 2017-02-04 16:09:07Z ngie $ */
2
3/*-
4 * Copyright (c) 2012 SRI International
5 * Copyright (c) 1992, 1993
6 *	The Regents of the University of California.  All rights reserved.
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 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef _LIBNETBSD_SYS_CDEFS_H_
34#define _LIBNETBSD_SYS_CDEFS_H_
35
36#include_next <sys/cdefs.h>
37
38#ifdef __dead2
39#define __dead __dead2
40#else
41#define __dead
42#endif
43
44/*
45 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
46 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
47 * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
48 * in between its arguments.  __CONCAT can also concatenate double-quoted
49 * strings produced by the __STRING macro, but this only works with ANSI C.
50 */
51
52#define	___STRING(x)	__STRING(x)
53#define	___CONCAT(x,y)	__CONCAT(x,y)
54
55/*
56 * The following macro is used to remove const cast-away warnings
57 * from gcc -Wcast-qual; it should be used with caution because it
58 * can hide valid errors; in particular most valid uses are in
59 * situations where the API requires it, not to cast away string
60 * constants. We don't use *intptr_t on purpose here and we are
61 * explicit about unsigned long so that we don't have additional
62 * dependencies.
63 */
64#define __UNCONST(a)	((void *)(unsigned long)(const void *)(a))
65
66/*
67 * Return the number of elements in a statically-allocated array,
68 * __x.
69 */
70#define	__arraycount(__x)	(sizeof(__x) / sizeof(__x[0]))
71
72/* __BIT(n): nth bit, where __BIT(0) == 0x1. */
73#define	__BIT(__n)	\
74    (((uintmax_t)(__n) >= NBBY * sizeof(uintmax_t)) ? 0 : \
75    ((uintmax_t)1 << (uintmax_t)((__n) & (NBBY * sizeof(uintmax_t) - 1))))
76
77/* __BITS(m, n): bits m through n, m < n. */
78#define	__BITS(__m, __n)	\
79	((__BIT(MAX((__m), (__n)) + 1) - 1) ^ (__BIT(MIN((__m), (__n))) - 1))
80
81#endif /* _LIBNETBSD_SYS_CDEFS_H_ */
82