114 lines
5.7 KiB
Ada
114 lines
5.7 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . C A L E N D A R . C O N V E R S I O N S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2008-2014, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package provides various routines for conversion between Ada and Unix
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-- time models - Time, Duration, struct tm and struct timespec.
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with Interfaces.C;
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package Ada.Calendar.Conversions is
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function To_Ada_Time (Unix_Time : Interfaces.C.long) return Time;
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-- Convert a time value represented as number of seconds since the
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-- Unix Epoch to a time value relative to an Ada implementation-defined
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-- Epoch. The units of the result are nanoseconds on all targets. Raises
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-- Time_Error if the result cannot fit into a Time value.
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function To_Ada_Time
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(tm_year : Interfaces.C.int;
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tm_mon : Interfaces.C.int;
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tm_day : Interfaces.C.int;
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tm_hour : Interfaces.C.int;
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tm_min : Interfaces.C.int;
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tm_sec : Interfaces.C.int;
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tm_isdst : Interfaces.C.int) return Time;
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-- Convert a time value expressed in Unix-like fields of struct tm into
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-- a Time value relative to the Ada Epoch. The ranges of the formals are
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-- as follows:
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-- tm_year -- years since 1900
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-- tm_mon -- months since January [0 .. 11]
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-- tm_day -- day of the month [1 .. 31]
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-- tm_hour -- hours since midnight [0 .. 24]
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-- tm_min -- minutes after the hour [0 .. 59]
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-- tm_sec -- seconds after the minute [0 .. 60]
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-- tm_isdst -- Daylight Savings Time flag [-1 .. 1]
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-- The returned value is in UTC and may or may not contain leap seconds
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-- depending on whether binder flag "-y" was used. Raises Time_Error if
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-- the input values are out of the defined ranges or if tm_sec equals 60
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-- and the instance in time is not a leap second occurrence.
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function To_Duration
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(tv_sec : Interfaces.C.long;
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tv_nsec : Interfaces.C.long) return Duration;
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-- Convert an elapsed time value expressed in Unix-like fields of struct
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-- timespec into a Duration value. The expected ranges are:
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-- tv_sec - seconds
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-- tv_nsec - nanoseconds
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procedure To_Struct_Timespec
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(D : Duration;
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tv_sec : out Interfaces.C.long;
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tv_nsec : out Interfaces.C.long);
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-- Convert a Duration value into the constituents of struct timespec.
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-- Formal tv_sec denotes seconds and tv_nsecs denotes nanoseconds.
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procedure To_Struct_Tm
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(T : Time;
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tm_year : out Interfaces.C.int;
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tm_mon : out Interfaces.C.int;
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tm_day : out Interfaces.C.int;
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tm_hour : out Interfaces.C.int;
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tm_min : out Interfaces.C.int;
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tm_sec : out Interfaces.C.int);
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-- Convert a Time value set in the Ada Epoch into the constituents of
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-- struct tm. The ranges of the out formals are as follows:
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-- tm_year -- years since 1900
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-- tm_mon -- months since January [0 .. 11]
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-- tm_day -- day of the month [1 .. 31]
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-- tm_hour -- hours since midnight [0 .. 24]
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-- tm_min -- minutes after the hour [0 .. 59]
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-- tm_sec -- seconds after the minute [0 .. 60]
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-- tm_isdst -- Daylight Savings Time flag [-1 .. 1]
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-- The input date is considered to be in UTC
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function To_Unix_Time (Ada_Time : Time) return Interfaces.C.long;
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-- Convert a time value represented as number of time units since the Ada
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-- implementation-defined Epoch to a value relative to the Unix Epoch. The
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-- units of the result are seconds. Raises Time_Error if the result cannot
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-- fit into a Time value.
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end Ada.Calendar.Conversions;
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