4 * Copyright (c) 2012 SRI International
5 * Copyright (c) 1992, 1993
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33 #ifndef _LIBNETBSD_SYS_CDEFS_H_
34 #define _LIBNETBSD_SYS_CDEFS_H_
36 #include_next <sys/cdefs.h>
39 #define __dead __dead2
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.
52 #define ___STRING(x) __STRING(x)
53 #define ___CONCAT(x,y) __CONCAT(x,y)
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
64 #define __UNCONST(a) ((void *)(unsigned long)(const void *)(a))
67 * Return the number of elements in a statically-allocated array,
70 #define __arraycount(__x) (sizeof(__x) / sizeof(__x[0]))
72 /* __BIT(n): nth bit, where __BIT(0) == 0x1. */
74 (((uintmax_t)(__n) >= NBBY * sizeof(uintmax_t)) ? 0 : \
75 ((uintmax_t)1 << (uintmax_t)((__n) & (NBBY * sizeof(uintmax_t) - 1))))
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))
81 #endif /* _LIBNETBSD_SYS_CDEFS_H_ */