Mercurial > hg > octave-lyh > gnulib-hg
changeset 15332:c762e3063952
dtotimespec: new module
* lib/timespec.h (dtotimespec): New decl.
* lib/dtotimespec.c, modules/dtotimespec: New files.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Thu, 30 Jun 2011 15:14:25 -0700 |
parents | d214a85acda4 |
children | f03da5e72c61 |
files | ChangeLog lib/dtotimespec.c lib/timespec.h modules/dtotimespec |
diffstat | 4 files changed, 100 insertions(+), 0 deletions(-) [+] |
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--- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,9 @@ 2011-06-30 Paul Eggert <eggert@cs.ucla.edu> + dtotimespec: new module + * lib/timespec.h (dtotimespec): New decl. + * lib/dtotimespec.c, modules/dtotimespec: New files. + * lib/timespec.h (timespec_sign, timespectod): New inline functions. pselect: new module
new file mode 100644 --- /dev/null +++ b/lib/dtotimespec.c @@ -0,0 +1,69 @@ +/* Convert double to timespec. + + Copyright (C) 2011 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */ + +/* written by Paul Eggert */ + +/* Convert the double value SEC to a struct timespec. Round toward + positive infinity. On overflow, return an extremal value. */ + +#include <config.h> + +#include "timespec.h" + +#include "intprops.h" + +struct timespec +dtotimespec (double sec) +{ + enum { BILLION = 1000 * 1000 * 1000 }; + double min_representable = TYPE_MINIMUM (time_t); + double max_representable = + ((TYPE_MAXIMUM (time_t) * (double) BILLION + (BILLION - 1)) + / BILLION); + struct timespec r; + + if (! (min_representable < sec)) + { + r.tv_sec = TYPE_MINIMUM (time_t); + r.tv_nsec = 0; + } + else if (! (sec < max_representable)) + { + r.tv_sec = TYPE_MAXIMUM (time_t); + r.tv_nsec = BILLION - 1; + } + else + { + time_t s = sec; + double frac = BILLION * (sec - s); + long ns = frac; + ns += ns < frac; + s += ns / BILLION; + ns %= BILLION; + + if (ns < 0) + { + s--; + ns += BILLION; + } + + r.tv_sec = s; + r.tv_nsec = ns; + } + + return r; +}
--- a/lib/timespec.h +++ b/lib/timespec.h @@ -65,6 +65,8 @@ return a.tv_sec < 0 ? -1 : a.tv_sec || a.tv_nsec; } +struct timespec dtotimespec (double); + /* Return an approximation to A, of type 'double'. */ static inline double timespectod (struct timespec a)
new file mode 100644 --- /dev/null +++ b/modules/dtotimespec @@ -0,0 +1,25 @@ +Description: +Convert double to timespec. + +Files: +lib/dtotimespec.c + +Depends-on: +intprops +timespec + +configure.ac: + +Makefile.am: +lib_SOURCES += dtotimespec.c + +Include: +"timespec.h" + +Link: + +License: +GPL + +Maintainer: +Paul Eggert, Jim Meyering