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[PATCH 3/5] dtotimespec: new module
From: |
Paul Eggert |
Subject: |
[PATCH 3/5] dtotimespec: new module |
Date: |
Thu, 30 Jun 2011 15:28:23 -0700 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc14 Thunderbird/3.1.10 |
* lib/timespec.h (dtotimespec): New decl.
* lib/dtotimespec.c, modules/dtotimespec: New files.
---
ChangeLog | 4 +++
lib/dtotimespec.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++
lib/timespec.h | 2 +
modules/dtotimespec | 25 ++++++++++++++++++
4 files changed, 100 insertions(+), 0 deletions(-)
create mode 100644 lib/dtotimespec.c
create mode 100644 modules/dtotimespec
diff --git a/ChangeLog b/ChangeLog
index 0f37252..d20588f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
2011-06-30 Paul Eggert <address@hidden>
+ 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
diff --git a/lib/dtotimespec.c b/lib/dtotimespec.c
new file mode 100644
index 0000000..ea0470a
--- /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;
+}
diff --git a/lib/timespec.h b/lib/timespec.h
index 071f3a1..191cf06 100644
--- a/lib/timespec.h
+++ b/lib/timespec.h
@@ -65,6 +65,8 @@ timespec_sign (struct timespec a)
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)
diff --git a/modules/dtotimespec b/modules/dtotimespec
new file mode 100644
index 0000000..d570591
--- /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
--
1.7.4.4
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