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Type macros providing min and max values for the given type, plus one that

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returns if a value can be represented in a given type.
This commit is contained in:
christos 2012-03-13 21:07:28 +00:00
parent 8ae54e9304
commit ce8a399bb3
1 changed files with 29 additions and 1 deletions
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30
sys/sys/cdefs.h
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@ -1,4 +1,4 @@
/* $NetBSD: cdefs.h,v 1.92 2012/02/22 17:52:58 martin Exp $ */
/* $NetBSD: cdefs.h,v 1.93 2012/03/13 21:07:28 christos Exp $ */
/*
* Copyright (c) 1991, 1993
@ -530,4 +530,32 @@
#define __CAST(__dt, __st) ((__dt)(__st))
#endif
#define __type_mask(t) (/*LINTED*/sizeof(t) < sizeof(intmax_t) ? \
(~((1ULL << (sizeof(t) * NBBY)) - 1)) : 0ULL)
static inline long long __zero(void) { return 0; }
static __inline int __negative(double x) { return x < 0; }
#define __type_min_s(t) ((t)((1ULL << (sizeof(t) * NBBY - 1))))
#define __type_max_s(t) ((t)~((1ULL << (sizeof(t) * NBBY - 1))))
#define __type_min_u(t) ((t)0ULL)
#define __type_max_u(t) ((t)~0ULL)
#define __type_is_signed(t) (/*LINTED*/__type_min_s(t) + (t)1 < (t)1)
#define __type_min(t) (__type_is_signed(t) ? __type_min_s(t) : __type_min_u(t))
#define __type_max(t) (__type_is_signed(t) ? __type_max_s(t) : __type_max_u(t))
#define __type_fit_u(t, a) (/*LINTED*/sizeof(t) < sizeof(intmax_t) ? \
(((a) & __type_mask(t)) == 0) : !__negative(a))
#define __type_fit_s(t, a) (/*LINTED*/__negative(a) ? \
((intmax_t)((a) + __zero()) >= (intmax_t)__type_min_s(t)) : \
((intmax_t)((a) + __zero()) <= (intmax_t)__type_max_s(t)))
/*
* return true if value 'a' fits in type 't'
*/
#define __type_fit(t, a) (__type_is_signed(t) ? \
__type_fit_s(t, a) : __type_fit_u(t, a))
#endif /* !_SYS_CDEFS_H_ */