+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- A D A . C A L E N D A R --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-2000 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 2, 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This is the Alpha/VMS version.
-
-with System.Aux_DEC; use System.Aux_DEC;
-
-package body Ada.Calendar is
-
- ------------------------------
- -- Use of Pragma Unsuppress --
- ------------------------------
-
- -- This implementation of Calendar takes advantage of the permission in
- -- Ada 95 of using arithmetic overflow checks to check for out of bounds
- -- time values. This means that we must catch the constraint error that
- -- results from arithmetic overflow, so we use pragma Unsuppress to make
- -- sure that overflow is enabled, using software overflow checking if
- -- necessary. That way, compiling Calendar with options to suppress this
- -- checking will not affect its correctness.
-
- ------------------------
- -- Local Declarations --
- ------------------------
-
- Ada_Year_Min : constant := 1901;
- Ada_Year_Max : constant := 2099;
-
- -- Some basic constants used throughout
-
- Days_In_Month : constant array (Month_Number) of Day_Number :=
- (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
-
- function To_Relative_Time (D : Duration) return Time;
-
- function To_Relative_Time (D : Duration) return Time is
- begin
- return Time (Long_Integer'Integer_Value (D) / 100);
- end To_Relative_Time;
-
- ---------
- -- "+" --
- ---------
-
- function "+" (Left : Time; Right : Duration) return Time is
- pragma Unsuppress (Overflow_Check);
- begin
- return (Left + To_Relative_Time (Right));
-
- exception
- when Constraint_Error =>
- raise Time_Error;
- end "+";
-
- function "+" (Left : Duration; Right : Time) return Time is
- pragma Unsuppress (Overflow_Check);
- begin
- return (To_Relative_Time (Left) + Right);
-
- exception
- when Constraint_Error =>
- raise Time_Error;
- end "+";
-
- ---------
- -- "-" --
- ---------
-
- function "-" (Left : Time; Right : Duration) return Time is
- pragma Unsuppress (Overflow_Check);
- begin
- return Left - To_Relative_Time (Right);
-
- exception
- when Constraint_Error =>
- raise Time_Error;
- end "-";
-
- function "-" (Left : Time; Right : Time) return Duration is
- pragma Unsuppress (Overflow_Check);
- begin
- return Duration'Fixed_Value
- ((Long_Integer (Left) - Long_Integer (Right)) * 100);
-
- exception
- when Constraint_Error =>
- raise Time_Error;
- end "-";
-
- ---------
- -- "<" --
- ---------
-
- function "<" (Left, Right : Time) return Boolean is
- begin
- return Long_Integer (Left) < Long_Integer (Right);
- end "<";
-
- ----------
- -- "<=" --
- ----------
-
- function "<=" (Left, Right : Time) return Boolean is
- begin
- return Long_Integer (Left) <= Long_Integer (Right);
- end "<=";
-
- ---------
- -- ">" --
- ---------
-
- function ">" (Left, Right : Time) return Boolean is
- begin
- return Long_Integer (Left) > Long_Integer (Right);
- end ">";
-
- ----------
- -- ">=" --
- ----------
-
- function ">=" (Left, Right : Time) return Boolean is
- begin
- return Long_Integer (Left) >= Long_Integer (Right);
- end ">=";
-
- -----------
- -- Clock --
- -----------
-
- -- The Ada.Calendar.Clock function gets the time.
- -- Note that on other targets a soft-link is used to get a different clock
- -- depending whether tasking is used or not. On VMS this isn't needed
- -- since all clock calls end up using SYS$GETTIM, so call the
- -- OS_Primitives version for efficiency.
-
- function Clock return Time is
- begin
- return Time (OSP.OS_Clock);
- end Clock;
-
- ---------
- -- Day --
- ---------
-
- function Day (Date : Time) return Day_Number is
- DY : Year_Number;
- DM : Month_Number;
- DD : Day_Number;
- DS : Day_Duration;
-
- begin
- Split (Date, DY, DM, DD, DS);
- return DD;
- end Day;
-
- -----------
- -- Month --
- -----------
-
- function Month (Date : Time) return Month_Number is
- DY : Year_Number;
- DM : Month_Number;
- DD : Day_Number;
- DS : Day_Duration;
-
- begin
- Split (Date, DY, DM, DD, DS);
- return DM;
- end Month;
-
- -------------
- -- Seconds --
- -------------
-
- function Seconds (Date : Time) return Day_Duration is
- DY : Year_Number;
- DM : Month_Number;
- DD : Day_Number;
- DS : Day_Duration;
-
- begin
- Split (Date, DY, DM, DD, DS);
- return DS;
- end Seconds;
-
- -----------
- -- Split --
- -----------
-
- procedure Split
- (Date : Time;
- Year : out Year_Number;
- Month : out Month_Number;
- Day : out Day_Number;
- Seconds : out Day_Duration)
- is
- procedure Numtim (
- Status : out Unsigned_Longword;
- Timbuf : out Unsigned_Word_Array;
- Timadr : in Time);
-
- pragma Interface (External, Numtim);
-
- pragma Import_Valued_Procedure (Numtim, "SYS$NUMTIM",
- (Unsigned_Longword, Unsigned_Word_Array, Time),
- (Value, Reference, Reference));
-
- Status : Unsigned_Longword;
- Timbuf : Unsigned_Word_Array (1 .. 7);
-
- begin
- Numtim (Status, Timbuf, Date);
-
- if Status mod 2 /= 1
- or else Timbuf (1) not in Ada_Year_Min .. Ada_Year_Max
- then
- raise Time_Error;
- end if;
-
- Seconds
- := Day_Duration (Timbuf (6) + 60 * (Timbuf (5) + 60 * Timbuf (4)))
- + Day_Duration (Timbuf (7)) / 100.0;
- Day := Integer (Timbuf (3));
- Month := Integer (Timbuf (2));
- Year := Integer (Timbuf (1));
- end Split;
-
- -------------
- -- Time_Of --
- -------------
-
- function Time_Of
- (Year : Year_Number;
- Month : Month_Number;
- Day : Day_Number;
- Seconds : Day_Duration := 0.0)
- return Time
- is
-
- procedure Cvt_Vectim (
- Status : out Unsigned_Longword;
- Input_Time : in Unsigned_Word_Array;
- Resultant_Time : out Time);
-
- pragma Interface (External, Cvt_Vectim);
-
- pragma Import_Valued_Procedure (Cvt_Vectim, "LIB$CVT_VECTIM",
- (Unsigned_Longword, Unsigned_Word_Array, Time),
- (Value, Reference, Reference));
-
- Status : Unsigned_Longword;
- Timbuf : Unsigned_Word_Array (1 .. 7);
- Date : Time;
- Int_Secs : Integer;
- Day_Hack : Boolean := False;
- begin
- -- The following checks are redundant with respect to the constraint
- -- error checks that should normally be made on parameters, but we
- -- decide to raise Constraint_Error in any case if bad values come
- -- in (as a result of checks being off in the caller, or for other
- -- erroneous or bounded error cases).
-
- if not Year 'Valid
- or else not Month 'Valid
- or else not Day 'Valid
- or else not Seconds'Valid
- then
- raise Constraint_Error;
- end if;
-
- -- Truncate seconds value by subtracting 0.5 and rounding,
- -- but be careful with 0.0 since that will give -1.0 unless
- -- it is treated specially.
-
- if Seconds > 0.0 then
- Int_Secs := Integer (Seconds - 0.5);
- else
- Int_Secs := Integer (Seconds);
- end if;
-
- -- Cvt_Vectim barfs on the largest Day_Duration, so trick it by
- -- setting it to zero and then adding the difference after conversion.
-
- if Int_Secs = 86_400 then
- Int_Secs := 0;
- Day_Hack := True;
- Timbuf (7) := 0;
- else
- Timbuf (7) := Unsigned_Word
- (100.0 * Duration (Seconds - Day_Duration (Int_Secs)));
- -- Cvt_Vectim accurate only to within .01 seconds
- end if;
-
- -- Similar hack needed for 86399 and 100/100ths, since that gets
- -- treated as 86400 (largest Day_Duration). This can happen because
- -- Duration has more accuracy than VMS system time conversion calls
- -- can handle.
-
- if Int_Secs = 86_399 and then Timbuf (7) = 100 then
- Int_Secs := 0;
- Day_Hack := True;
- Timbuf (7) := 0;
- end if;
-
- Timbuf (6) := Unsigned_Word (Int_Secs mod 60);
- Timbuf (5) := Unsigned_Word ((Int_Secs / 60) mod 60);
- Timbuf (4) := Unsigned_Word (Int_Secs / 3600);
- Timbuf (3) := Unsigned_Word (Day);
- Timbuf (2) := Unsigned_Word (Month);
- Timbuf (1) := Unsigned_Word (Year);
-
- Cvt_Vectim (Status, Timbuf, Date);
-
- if Status mod 2 /= 1 then
- raise Time_Error;
- end if;
-
- if Day_Hack then
- Date := Date + 10_000_000 * 86_400;
- end if;
-
- return Date;
-
- end Time_Of;
-
- ----------
- -- Year --
- ----------
-
- function Year (Date : Time) return Year_Number is
- DY : Year_Number;
- DM : Month_Number;
- DD : Day_Number;
- DS : Day_Duration;
-
- begin
- Split (Date, DY, DM, DD, DS);
- return DY;
- end Year;
-
-end Ada.Calendar;
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