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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;