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(* SysClock.mod implement the ISO SysClock specification.
Copyright (C) 2009-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
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/>. *)
IMPLEMENTATION MODULE SysClock ;
FROM wraptime IMPORT timeval, timezone, tm,
InitTimezone, InitTimeval,
InitTM, KillTM,
gettimeofday, settimeofday, GetFractions,
localtime_r, GetSummerTime, GetDST,
KillTimezone, KillTimeval, GetYear,
GetMonth, GetDay, GetHour, GetMinute,
GetSecond, SetTimeval, SetTimezone ;
IMPORT Args ;
VAR
canget,
canset,
known : BOOLEAN ;
(*
determineAccess - test to see whether we can get and set
the time.
*)
PROCEDURE determineAccess ;
VAR
tv: timeval ;
tz: timezone ;
BEGIN
tz := InitTimezone () ;
tv := InitTimeval () ;
canget := gettimeofday (tv, tz) = 0 ;
canset := canget AND (settimeofday (tv, tz) = 0) ;
tz := KillTimezone (tz) ;
tv := KillTimeval (tv)
END determineAccess ;
PROCEDURE CanGetClock () : BOOLEAN ;
(* Tests if the clock can be read *)
BEGIN
IF NOT known
THEN
determineAccess
END ;
RETURN canget
END CanGetClock ;
PROCEDURE CanSetClock () : BOOLEAN ;
(* Tests if the clock can be set *)
BEGIN
IF NOT known
THEN
determineAccess
END ;
RETURN canset
END CanSetClock ;
PROCEDURE IsValidDateTime (userData: DateTime) : BOOLEAN ;
(* Tests if the value of userData is a valid *)
BEGIN
WITH userData DO
CASE month OF
1: |
2: IF ((year MOD 4=0) AND (year MOD 100#0)) OR (year MOD 400=0)
THEN
RETURN day<=29
ELSE
RETURN day<=28
END |
3: |
4: RETURN day<=30 |
5: |
6: RETURN day<=30 |
7: |
8: |
9: RETURN day<=30 |
10: |
11: RETURN day<=30 |
12:
END
END ;
RETURN( TRUE )
END IsValidDateTime ;
(*
foo -
*)
PROCEDURE foo () : CARDINAL ;
BEGIN
RETURN 1
END foo ;
PROCEDURE GetClock (VAR userData: DateTime) ;
(* Assigns local date and time of the day to userData *)
VAR
m : tm ;
tv: timeval ;
tz: timezone ;
BEGIN
IF CanGetClock ()
THEN
tv := InitTimeval () ;
tz := InitTimezone () ;
IF gettimeofday (tv, tz)=0
THEN
m := InitTM () ;
(* m := localtime_r (tv, m) ; *)
WITH userData DO
(*
year := GetYear (m) ;
*)
month := Args.Narg () (* GetMonth (m) *) (* + 1 *) ;
(*
day := GetDay (m) ;
hour := GetHour (m) ;
minute := GetMinute (m) ;
second := GetSecond (m) ;
fractions := GetFractions (tv) ;
zone := GetDST (tz) ;
summerTimeFlag := GetSummerTime (tz)
*)
END ;
m := KillTM (m)
ELSE
HALT
END ;
tv := KillTimeval (tv) ;
tz := KillTimezone (tz)
END
END GetClock ;
(*
daysInMonth - returns how many days there are in a month.
*)
PROCEDURE daysInMonth (year, month: CARDINAL) : CARDINAL ;
BEGIN
CASE month OF
1: |
2: IF ((year MOD 4=0) AND (year MOD 100#0)) OR (year MOD 400=0)
THEN
RETURN 29
ELSE
RETURN 28
END |
3: |
4: RETURN 30 |
5: |
6: RETURN 30 |
7: |
8: |
9: RETURN 30 |
10: |
11: RETURN 30 |
12: |
END ;
RETURN 31
END daysInMonth ;
(*
dayInYear -
*)
PROCEDURE dayInYear (day, month, year: CARDINAL) : CARDINAL ;
BEGIN
WHILE month > 1 DO
INC (day, daysInMonth (year, month)) ;
DEC (month)
END ;
RETURN day
END dayInYear ;
(*
dayInWeek -
*)
PROCEDURE dayInWeek (day, month, year: CARDINAL) : CARDINAL ;
CONST
janFirst1970 = 5 ; (* thursday *)
VAR
yearOffset: CARDINAL ; (* days since Jan 1st 1970 *)
BEGIN
yearOffset := janFirst1970 ;
WHILE year > 1970 DO
DEC (year) ;
INC (yearOffset, dayInYear (31, 12, year))
END ;
INC (yearOffset, dayInYear (day, month, year)) ;
RETURN yearOffset MOD 7
END dayInWeek ;
PROCEDURE SetClock (userData: DateTime);
(* Sets the system time clock to the given local date and
time *)
VAR
tv: timeval ;
tz: timezone ;
BEGIN
IF CanSetClock ()
THEN
tv := InitTimeval () ;
tz := InitTimezone () ;
IF gettimeofday (tv, tz) = 0
THEN
(* fill in as many of tv, tz fields from userData as we can *)
WITH userData DO
IF summerTimeFlag
THEN
SetTimeval (tv, second, minute, hour, day, month, year,
dayInYear(day, month, year),
dayInWeek(day, month, year),
1) ;
SetTimezone (tz, 1, zone)
ELSE
SetTimeval (tv, second, minute, hour, day, month, year,
dayInYear(day, month, year),
dayInWeek(day, month, year),
0) ;
SetTimezone (tz, 0, zone)
END ;
IF settimeofday (tv, tz)#0
THEN
(* error, which we ignore *)
END
END
END ;
tv := KillTimeval (tv) ;
tz := KillTimezone (tz)
END
END SetClock ;
BEGIN
known := FALSE ;
canset := FALSE ;
canget := FALSE
END SysClock.
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