7cfda699e6
* m4/absolute-header.m4: New file. * lib/Makefile.am, lib/argp-fmtstream.h, lib/argp.h, lib/error.c, lib/gethrxtime.h, lib/intprops.h, lib/localcharset.c, lib/quotearg.c, lib/stdio.in.h, lib/strerror-override.h, lib/sys_time.in.h, lib/timespec.h, lib/unistd.in.h, lib/verify.h, lib/wctype.in.h, lib/xalloc.h, lib/xsize.h, lib/xtime.h, m4/configmake.m4, m4/extern-inline.m4, m4/gnulib-comp.m4, m4/include_next.m4, m4/unistd_h.m4: Update to today's gnulib.
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/* xtime -- extended-resolution integer time stamps
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Copyright (C) 2005-2006, 2009-2013 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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#ifndef XTIME_H_
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#define XTIME_H_ 1
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#ifndef _GL_INLINE_HEADER_BEGIN
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#error "Please include config.h first."
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#endif
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_GL_INLINE_HEADER_BEGIN
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#ifndef XTIME_INLINE
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# define XTIME_INLINE _GL_INLINE
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#endif
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/* xtime_t is a signed type used for time stamps. It is an integer
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type that is a count of nanoseconds -- except for obsolescent hosts
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without sufficiently-wide integers, where it is a count of
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seconds. */
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#if HAVE_LONG_LONG_INT
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typedef long long int xtime_t;
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# define XTIME_PRECISION 1000000000
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#else
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# include <limits.h>
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typedef long int xtime_t;
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# if LONG_MAX >> 31 >> 31 == 0
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# define XTIME_PRECISION 1
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# else
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# define XTIME_PRECISION 1000000000
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# endif
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Return an extended time value that contains S seconds and NS
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nanoseconds, without any overflow checking. */
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XTIME_INLINE xtime_t
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xtime_make (xtime_t s, long int ns)
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{
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if (XTIME_PRECISION == 1)
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return s;
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else
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return XTIME_PRECISION * s + ns;
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}
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/* Return the number of seconds in T, which must be nonnegative. */
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XTIME_INLINE xtime_t
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xtime_nonnegative_sec (xtime_t t)
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{
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return t / XTIME_PRECISION;
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}
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/* Return the number of seconds in T. */
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XTIME_INLINE xtime_t
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xtime_sec (xtime_t t)
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{
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return (XTIME_PRECISION == 1
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? t
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: t < 0
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? (t + XTIME_PRECISION - 1) / XTIME_PRECISION - 1
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: xtime_nonnegative_sec (t));
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}
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/* Return the number of nanoseconds in T, which must be nonnegative. */
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XTIME_INLINE long int
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xtime_nonnegative_nsec (xtime_t t)
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{
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return t % XTIME_PRECISION;
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}
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/* Return the number of nanoseconds in T. */
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XTIME_INLINE long int
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xtime_nsec (xtime_t t)
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{
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long int ns = t % XTIME_PRECISION;
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if (ns < 0)
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ns += XTIME_PRECISION;
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return ns;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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