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
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* $NetBSD: difftime.c,v 1.15 2013/09/20 19:06:54 christos Exp $ */
|
|
|
|
/*
|
|
** This file is in the public domain, so clarified as of
|
|
** 1996-06-05 by Arthur David Olson.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char elsieid[] = "@(#)difftime.c 8.1";
|
|
#else
|
|
__RCSID("$NetBSD: difftime.c,v 1.15 2013/09/20 19:06:54 christos Exp $");
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
/*LINTLIBRARY*/
|
|
|
|
#include "private.h" /* for time_t and TYPE_SIGNED */
|
|
|
|
double ATTRIBUTE_CONST
|
|
difftime(const time_t time1, const time_t time0)
|
|
{
|
|
/*
|
|
** If (sizeof (double) > sizeof (time_t)) simply convert and subtract
|
|
** (assuming that the larger type has more precision).
|
|
*/
|
|
/*CONSTCOND*/
|
|
if (sizeof (double) > sizeof (time_t))
|
|
return (double) time1 - (double) time0;
|
|
/*LINTED const not */
|
|
if (!TYPE_SIGNED(time_t)) {
|
|
/*
|
|
** The difference of two unsigned values can't overflow
|
|
** if the minuend is greater than or equal to the subtrahend.
|
|
*/
|
|
if (time1 >= time0)
|
|
return time1 - time0;
|
|
else return -(double) (time0 - time1);
|
|
}
|
|
/*
|
|
** Handle cases where both time1 and time0 have the same sign
|
|
** (meaning that their difference cannot overflow).
|
|
*/
|
|
if ((time1 < 0) == (time0 < 0))
|
|
return time1 - time0;
|
|
/*
|
|
** time1 and time0 have opposite signs.
|
|
** Punt if uintmax_t is too narrow.
|
|
** This suffers from double rounding; attempt to lessen that
|
|
** by using long double temporaries.
|
|
*/
|
|
/* CONSTCOND */
|
|
if (sizeof (uintmax_t) < sizeof (time_t))
|
|
return (double) time1 - (double) time0;
|
|
/*
|
|
** Stay calm...decent optimizers will eliminate the complexity below.
|
|
*/
|
|
if (time1 >= 0 /* && time0 < 0 */)
|
|
return (uintmax_t) time1 + (uintmax_t) (-(time0 + 1)) + 1;
|
|
return -(double) ((uintmax_t) time0 + (uintmax_t) (-(time1 + 1)) + 1);
|
|
}
|