mirror of
https://github.com/coreutils/coreutils.git
synced 2024-12-11 10:53:42 +08:00
970dc8e4a8
so that the code works even with ancient cpp. Portability problem with GCC 2.7.2.1 reported by Thomas M.Ott.
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* xtime -- extended-resolution integer time stamps
|
|
|
|
Copyright (C) 2005 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software Foundation,
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
|
|
|
|
/* Written by Paul Eggert. */
|
|
|
|
#ifndef XTIME_H_
|
|
# define XTIME_H_ 1
|
|
|
|
/* xtime_t is a signed type used for time stamps. It is an integer
|
|
type that is a count of nanoseconds -- except for obsolescent hosts
|
|
without sufficiently-wide integers, where it is a count of
|
|
seconds. */
|
|
# if HAVE_LONG_LONG
|
|
typedef long long int xtime_t;
|
|
# define XTIME_PRECISION 1000000000
|
|
# else
|
|
# include <limits.h>
|
|
typedef long int xtime_t;
|
|
# if LONG_MAX >> 31 >> 31 == 0
|
|
# define XTIME_PRECISION 1
|
|
# else
|
|
# define XTIME_PRECISION 1000000000
|
|
# endif
|
|
# endif
|
|
|
|
/* Return an extended time value that contains S seconds and NS
|
|
nanoseconds, without any overflow checking. */
|
|
static inline xtime_t
|
|
xtime_make (xtime_t s, int ns)
|
|
{
|
|
if (XTIME_PRECISION == 1)
|
|
return s;
|
|
else
|
|
return XTIME_PRECISION * s + ns;
|
|
}
|
|
|
|
/* Return the number of seconds in T, which must be nonnegative. */
|
|
static inline xtime_t
|
|
xtime_nonnegative_sec (xtime_t t)
|
|
{
|
|
return t / XTIME_PRECISION;
|
|
}
|
|
|
|
/* Return the number of seconds in T. */
|
|
static inline xtime_t
|
|
xtime_sec (xtime_t t)
|
|
{
|
|
return (XTIME_PRECISION == 1
|
|
? t
|
|
: t < 0
|
|
? (t + XTIME_PRECISION - 1) / XTIME_PRECISION - 1
|
|
: xtime_nonnegative_sec (t));
|
|
}
|
|
|
|
/* Return the number of nanoseconds in T, which must be nonnegative. */
|
|
static inline int
|
|
xtime_nonnegative_nsec (xtime_t t)
|
|
{
|
|
return t % XTIME_PRECISION;
|
|
}
|
|
|
|
/* Return the number of nanoseconds in T. */
|
|
static inline int
|
|
xtime_nsec (xtime_t t)
|
|
{
|
|
int ns = t % XTIME_PRECISION;
|
|
if (ns < 0)
|
|
ns += XTIME_PRECISION;
|
|
return ns;
|
|
}
|
|
|
|
#endif
|