84d9c625bf
- Fix for possible unset uid/gid in toproto
- Fix for default mtree style
- Update libelf
- Importing libexecinfo
- Resynchronize GCC, mpc, gmp, mpfr
- build.sh: Replace params with show-params.
This has been done as the make target has been renamed in the same
way, while a new target named params has been added. This new
target generates a file containing all the parameters, instead of
printing it on the console.
- Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
get getservbyport() out of the inner loop
Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* $NetBSD: difftime.c,v 1.15 2013/09/20 19:06:54 christos Exp $ */
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/*
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** This file is in the public domain, so clarified as of
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** 1996-06-05 by Arthur David Olson.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char elsieid[] = "@(#)difftime.c 8.1";
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#else
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__RCSID("$NetBSD: difftime.c,v 1.15 2013/09/20 19:06:54 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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/*LINTLIBRARY*/
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#include "private.h" /* for time_t and TYPE_SIGNED */
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double ATTRIBUTE_CONST
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difftime(const time_t time1, const time_t time0)
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{
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/*
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** If (sizeof (double) > sizeof (time_t)) simply convert and subtract
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** (assuming that the larger type has more precision).
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*/
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/*CONSTCOND*/
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if (sizeof (double) > sizeof (time_t))
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return (double) time1 - (double) time0;
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/*LINTED const not */
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if (!TYPE_SIGNED(time_t)) {
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/*
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** The difference of two unsigned values can't overflow
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** if the minuend is greater than or equal to the subtrahend.
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*/
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if (time1 >= time0)
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return time1 - time0;
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else return -(double) (time0 - time1);
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}
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/*
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** Handle cases where both time1 and time0 have the same sign
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** (meaning that their difference cannot overflow).
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*/
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if ((time1 < 0) == (time0 < 0))
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return time1 - time0;
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/*
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** time1 and time0 have opposite signs.
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** Punt if uintmax_t is too narrow.
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** This suffers from double rounding; attempt to lessen that
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** by using long double temporaries.
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*/
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/* CONSTCOND */
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if (sizeof (uintmax_t) < sizeof (time_t))
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return (double) time1 - (double) time0;
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/*
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** Stay calm...decent optimizers will eliminate the complexity below.
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*/
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if (time1 >= 0 /* && time0 < 0 */)
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return (uintmax_t) time1 + (uintmax_t) (-(time0 + 1)) + 1;
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return -(double) ((uintmax_t) time0 + (uintmax_t) (-(time1 + 1)) + 1);
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}
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