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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . C A L E N D A R . C O N V E R S I O N S --
-- --
-- S p e c --
-- --
-- Copyright (C) 2008-2009 Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package provides various routines for conversion between Ada and Unix
-- time models - Time, Duration, struct tm and struct timespec.
with Interfaces.C;
package Ada.Calendar.Conversions is
function To_Ada_Time (Unix_Time : Interfaces.C.long) return Time;
-- Convert a time value represented as number of seconds since the Unix
-- Epoch to a time value relative to an Ada implementation-defined Epoch.
-- The units of the result are 100 nanoseconds on VMS and nanoseconds on
-- all other targets. Raises Time_Error if the result cannot fit into a
-- Time value.
function To_Ada_Time
(tm_year : Interfaces.C.int;
tm_mon : Interfaces.C.int;
tm_day : Interfaces.C.int;
tm_hour : Interfaces.C.int;
tm_min : Interfaces.C.int;
tm_sec : Interfaces.C.int;
tm_isdst : Interfaces.C.int) return Time;
-- Convert a time value expressed in Unix-like fields of struct tm into
-- a Time value relative to the Ada Epoch. The ranges of the formals are
-- as follows:
-- tm_year -- years since 1900
-- tm_mon -- months since January [0 .. 11]
-- tm_day -- day of the month [1 .. 31]
-- tm_hour -- hours since midnight [0 .. 24]
-- tm_min -- minutes after the hour [0 .. 59]
-- tm_sec -- seconds after the minute [0 .. 60]
-- tm_isdst -- Daylight Savings Time flag [-1 .. 1]
-- The returned value is in UTC and may or may not contain leap seconds
-- depending on whether binder flag "-y" was used. Raises Time_Error if
-- the input values are out of the defined ranges or if tm_sec equals 60
-- and the instance in time is not a leap second occurrence.
function To_Duration
(tv_sec : Interfaces.C.long;
tv_nsec : Interfaces.C.long) return Duration;
-- Convert an elapsed time value expressed in Unix-like fields of struct
-- timespec into a Duration value. The expected ranges are:
-- tv_sec - seconds
-- tv_nsec - nanoseconds
procedure To_Struct_Timespec
(D : Duration;
tv_sec : out Interfaces.C.long;
tv_nsec : out Interfaces.C.long);
-- Convert a Duration value into the constituents of struct timespec.
-- Formal tv_sec denotes seconds and tv_nsecs denotes nanoseconds.
procedure To_Struct_Tm
(T : Time;
tm_year : out Interfaces.C.int;
tm_mon : out Interfaces.C.int;
tm_day : out Interfaces.C.int;
tm_hour : out Interfaces.C.int;
tm_min : out Interfaces.C.int;
tm_sec : out Interfaces.C.int);
-- Convert a Time value set in the Ada Epoch into the constituents of
-- struct tm. The ranges of the out formals are as follows:
-- tm_year -- years since 1900
-- tm_mon -- months since January [0 .. 11]
-- tm_day -- day of the month [1 .. 31]
-- tm_hour -- hours since midnight [0 .. 24]
-- tm_min -- minutes after the hour [0 .. 59]
-- tm_sec -- seconds after the minute [0 .. 60]
-- tm_isdst -- Daylight Savings Time flag [-1 .. 1]
-- The input date is considered to be in UTC
function To_Unix_Time (Ada_Time : Time) return Interfaces.C.long;
-- Convert a time value represented as number of time units since the Ada
-- implementation-defined Epoch to a value relative to the Unix Epoch. The
-- units of the result are seconds. Raises Time_Error if the result cannot
-- fit into a Time value.
end Ada.Calendar.Conversions;
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