6e451134f0
2006-10-31 Hristian Kirtchev <kirtchev@adacore.com>
Jose Ruiz <ruiz@adacore.com>
* a-calend-vms.adb (Leap_Sec_Ops): Temp body for package in private
part of Ada.Calendar: all subprogram raise Unimplemented.
(Split_W_Offset): Temp function body, raising Unimplemented
* a-calend.ads, a-calend-vms.ads:
Add imported variable Invalid_TZ_Offset used to designate targets unable
to support time zones.
(Unimplemented): Temporary function raised by the body of new
subprograms below.
(Leap_Sec_Ops): New package in the private part of Ada.Calendar. This
unit provides handling of leap seconds and is used by the new Ada 2005
packages Ada.Calendar.Arithmetic and Ada.Calendar.Formatting.
(Split_W_Offset): Identical spec to that of Ada.Calendar.Split. This
version returns an extra value which is the offset to UTC.
* a-calend.adb (Split_W_Offset): Add call to localtime_tzoff.
(Leap_Sec_Ops): New body for package in private part of Ada.Calendar.
(Split_W_Offset): New function body.
(Time_Of): When a date is close to UNIX epoch, compute the time for
that date plus one day (that amount is later substracted after
executing mktime) so there are no problems with time zone adjustments.
* a-calend-mingw.adb: Remove Windows specific version no longer needed.
* a-calari.ads, a-calari.adb, a-calfor.ads, a-calfor.adb,
a-catizo.ads, a-catizo.adb: New files.
* impunit.adb: Add new Ada 2005 entries
* sysdep.c: Add external variable __gnat_invalid_tz_offset.
Rename all occurences of "__gnat_localtime_r" to
"__gnat_localtime_tzoff".
(__gnat_localtime_tzoff for Windows): Add logic to retrieve the time
zone data and calculate the GMT offset.
(__gnat_localtime_tzoff for Darwin, Free BSD, Linux, Lynx and Tru64):
Use the field "tm_gmtoff" to extract the GMT offset.
(__gnat_localtime_tzoff for AIX, HPUX, SGI Irix and Sun Solaris): Use
the external variable "timezone" to calculate the GMT offset.
From-SVN: r118234
417 lines
12 KiB
Ada
417 lines
12 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 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2006, 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 2, 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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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 is the Alpha/VMS version
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with System.Aux_DEC; use System.Aux_DEC;
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package body Ada.Calendar is
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------------------------------
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-- Use of Pragma Unsuppress --
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------------------------------
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-- This implementation of Calendar takes advantage of the permission in
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-- Ada 95 of using arithmetic overflow checks to check for out of bounds
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-- time values. This means that we must catch the constraint error that
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-- results from arithmetic overflow, so we use pragma Unsuppress to make
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-- sure that overflow is enabled, using software overflow checking if
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-- necessary. That way, compiling Calendar with options to suppress this
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-- checking will not affect its correctness.
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------------------------
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-- Local Declarations --
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------------------------
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Ada_Year_Min : constant := 1901;
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Ada_Year_Max : constant := 2099;
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-- Some basic constants used throughout
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function To_Relative_Time (D : Duration) return Time;
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function To_Relative_Time (D : Duration) return Time is
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begin
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return Time (Long_Integer'Integer_Value (D) / 100);
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end To_Relative_Time;
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---------
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-- "+" --
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---------
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function "+" (Left : Time; Right : Duration) return Time is
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pragma Unsuppress (Overflow_Check);
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begin
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return (Left + To_Relative_Time (Right));
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exception
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when Constraint_Error =>
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raise Time_Error;
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end "+";
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function "+" (Left : Duration; Right : Time) return Time is
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pragma Unsuppress (Overflow_Check);
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begin
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return (To_Relative_Time (Left) + Right);
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exception
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when Constraint_Error =>
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raise Time_Error;
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end "+";
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---------
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-- "-" --
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---------
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function "-" (Left : Time; Right : Duration) return Time is
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pragma Unsuppress (Overflow_Check);
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begin
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return Left - To_Relative_Time (Right);
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exception
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when Constraint_Error =>
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raise Time_Error;
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end "-";
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function "-" (Left : Time; Right : Time) return Duration is
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pragma Unsuppress (Overflow_Check);
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begin
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return Duration'Fixed_Value
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((Long_Integer (Left) - Long_Integer (Right)) * 100);
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exception
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when Constraint_Error =>
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raise Time_Error;
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end "-";
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---------
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-- "<" --
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---------
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function "<" (Left, Right : Time) return Boolean is
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begin
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return Long_Integer (Left) < Long_Integer (Right);
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end "<";
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----------
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-- "<=" --
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----------
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function "<=" (Left, Right : Time) return Boolean is
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begin
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return Long_Integer (Left) <= Long_Integer (Right);
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end "<=";
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---------
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-- ">" --
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---------
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function ">" (Left, Right : Time) return Boolean is
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begin
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return Long_Integer (Left) > Long_Integer (Right);
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end ">";
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----------
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-- ">=" --
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----------
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function ">=" (Left, Right : Time) return Boolean is
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begin
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return Long_Integer (Left) >= Long_Integer (Right);
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end ">=";
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-----------
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-- Clock --
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-----------
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-- The Ada.Calendar.Clock function gets the time.
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-- Note that on other targets a soft-link is used to get a different clock
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-- depending whether tasking is used or not. On VMS this isn't needed
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-- since all clock calls end up using SYS$GETTIM, so call the
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-- OS_Primitives version for efficiency.
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function Clock return Time is
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begin
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return Time (OSP.OS_Clock);
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end Clock;
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---------
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-- Day --
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---------
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function Day (Date : Time) return Day_Number is
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DY : Year_Number;
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DM : Month_Number;
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DD : Day_Number;
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DS : Day_Duration;
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begin
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Split (Date, DY, DM, DD, DS);
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return DD;
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end Day;
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-----------
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-- Month --
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-----------
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function Month (Date : Time) return Month_Number is
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DY : Year_Number;
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DM : Month_Number;
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DD : Day_Number;
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DS : Day_Duration;
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begin
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Split (Date, DY, DM, DD, DS);
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return DM;
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end Month;
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-------------
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-- Seconds --
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-------------
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function Seconds (Date : Time) return Day_Duration is
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DY : Year_Number;
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DM : Month_Number;
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DD : Day_Number;
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DS : Day_Duration;
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begin
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Split (Date, DY, DM, DD, DS);
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return DS;
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end Seconds;
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-----------
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-- Split --
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-----------
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procedure Split
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(Date : Time;
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Year : out Year_Number;
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Month : out Month_Number;
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Day : out Day_Number;
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Seconds : out Day_Duration)
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is
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procedure Numtim (
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Status : out Unsigned_Longword;
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Timbuf : out Unsigned_Word_Array;
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Timadr : Time);
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pragma Interface (External, Numtim);
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pragma Import_Valued_Procedure (Numtim, "SYS$NUMTIM",
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(Unsigned_Longword, Unsigned_Word_Array, Time),
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(Value, Reference, Reference));
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Status : Unsigned_Longword;
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Timbuf : Unsigned_Word_Array (1 .. 7);
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Subsecs : constant Time := Date mod 10_000_000;
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Date_Secs : constant Time := Date - Subsecs;
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begin
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Numtim (Status, Timbuf, Date_Secs);
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if Status mod 2 /= 1
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or else Timbuf (1) not in Ada_Year_Min .. Ada_Year_Max
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then
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raise Time_Error;
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end if;
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Seconds := Day_Duration (Timbuf (6)
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+ 60 * (Timbuf (5) + 60 * Timbuf (4)))
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+ Duration (Subsecs) / 10_000_000.0;
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Day := Integer (Timbuf (3));
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Month := Integer (Timbuf (2));
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Year := Integer (Timbuf (1));
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end Split;
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-----------------------
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-- Split_With_Offset --
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-----------------------
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procedure Split_With_Offset
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(Date : Time;
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Year : out Year_Number;
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Month : out Month_Number;
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Day : out Day_Number;
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Seconds : out Day_Duration;
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Offset : out Long_Integer)
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is
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begin
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raise Unimplemented;
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end Split_With_Offset;
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-------------
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-- Time_Of --
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-------------
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function Time_Of
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(Year : Year_Number;
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Month : Month_Number;
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Day : Day_Number;
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Seconds : Day_Duration := 0.0)
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return Time
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is
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procedure Cvt_Vectim (
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Status : out Unsigned_Longword;
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Input_Time : Unsigned_Word_Array;
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Resultant_Time : out Time);
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pragma Interface (External, Cvt_Vectim);
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pragma Import_Valued_Procedure (Cvt_Vectim, "LIB$CVT_VECTIM",
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(Unsigned_Longword, Unsigned_Word_Array, Time),
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(Value, Reference, Reference));
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Status : Unsigned_Longword;
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Timbuf : Unsigned_Word_Array (1 .. 7);
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Date : Time;
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Int_Secs : Integer;
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Day_Hack : Boolean := False;
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Subsecs : Day_Duration;
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begin
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-- The following checks are redundant with respect to the constraint
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-- error checks that should normally be made on parameters, but we
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-- decide to raise Constraint_Error in any case if bad values come
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-- in (as a result of checks being off in the caller, or for other
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-- erroneous or bounded error cases).
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if not Year 'Valid
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or else not Month 'Valid
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or else not Day 'Valid
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or else not Seconds'Valid
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then
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raise Constraint_Error;
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end if;
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-- Truncate seconds value by subtracting 0.5 and rounding,
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-- but be careful with 0.0 since that will give -1.0 unless
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-- it is treated specially.
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if Seconds > 0.0 then
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Int_Secs := Integer (Seconds - 0.5);
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else
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Int_Secs := Integer (Seconds);
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end if;
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Subsecs := Seconds - Day_Duration (Int_Secs);
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-- Cvt_Vectim barfs on the largest Day_Duration, so trick it by
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-- setting it to zero and then adding the difference after conversion.
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if Int_Secs = 86_400 then
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Int_Secs := 0;
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Day_Hack := True;
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end if;
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Timbuf (7) := 0;
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Timbuf (6) := Unsigned_Word (Int_Secs mod 60);
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Timbuf (5) := Unsigned_Word ((Int_Secs / 60) mod 60);
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Timbuf (4) := Unsigned_Word (Int_Secs / 3600);
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Timbuf (3) := Unsigned_Word (Day);
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Timbuf (2) := Unsigned_Word (Month);
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Timbuf (1) := Unsigned_Word (Year);
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Cvt_Vectim (Status, Timbuf, Date);
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if Status mod 2 /= 1 then
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raise Time_Error;
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end if;
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if Day_Hack then
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Date := Date + 10_000_000 * 86_400;
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end if;
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Date := Date + Time (10_000_000.0 * Subsecs);
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return Date;
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end Time_Of;
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----------
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-- Year --
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----------
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function Year (Date : Time) return Year_Number is
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DY : Year_Number;
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DM : Month_Number;
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DD : Day_Number;
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DS : Day_Duration;
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begin
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Split (Date, DY, DM, DD, DS);
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return DY;
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end Year;
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-------------------
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-- Leap_Sec_Ops --
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-------------------
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-- The package that is used by the Ada 2005 children of Ada.Calendar:
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-- Ada.Calendar.Arithmetic and Ada.Calendar.Formatting.
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package body Leap_Sec_Ops is
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--------------------------
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-- Cumulative_Leap_Secs --
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--------------------------
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procedure Cumulative_Leap_Secs
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(Start_Date : Time;
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End_Date : Time;
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Leaps_Between : out Duration;
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Next_Leap_Sec : out Time)
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is
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begin
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raise Unimplemented;
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end Cumulative_Leap_Secs;
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----------------------
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-- All_Leap_Seconds --
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----------------------
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function All_Leap_Seconds return Duration is
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begin
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raise Unimplemented;
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return 0.0;
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end All_Leap_Seconds;
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-- Start of processing in package Leap_Sec_Ops
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begin
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null;
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end Leap_Sec_Ops;
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end Ada.Calendar;
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