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DATE.PLM
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1982-12-31
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$title ('CP/M V3.0 Date and Time')
tod:
do;
/*
Revised:
14 Sept 81 by Thomas Rolander
Modifications:
Date: September 2,1982
Programmer: Thomas J. Mason
Changes:
The 'P' option was changed to the 'C'ontinuous option.
Also added is the 'S'et option to let the user set either
the time or the date.
Date: October 31,1982
Programmer: Bruce K. Skidmore
Changes:
Added Function 50 call to signal Time Set and Time Get.
*/
declare PLM label public;
mon1:
procedure (func,info) external;
declare func byte;
declare info address;
end mon1;
mon2:
procedure (func,info) byte external;
declare func byte;
declare info address;
end mon2;
mon2a:
procedure (func,info) address external;
declare func byte;
declare info address;
end mon2a;
declare xdos literally 'mon2a';
declare fcb (1) byte external;
declare fcb16 (1) byte external;
declare tbuff (1) byte external;
RETURN$VERSION$FUNC:
procedure address;
return MON2A(12,0);
end RETURN$VERSION$FUNC;
read$console:
procedure byte;
return mon2 (1,0);
end read$console;
write$console:
procedure (char);
declare char byte;
call mon1 (2,char);
end write$console;
print$buffer:
procedure (buffer$address);
declare buffer$address address;
call mon1 (9,buffer$address);
end print$buffer;
READ$CONSOLE$BUFFER:
procedure (BUFF$ADR);
declare BUFF$ADR address;
call MON1(10,BUFF$ADR);
end READ$CONSOLE$BUFFER;
check$console$status:
procedure byte;
return mon2 (11,0);
end check$console$status;
terminate:
procedure;
call mon1 (0,0);
end terminate;
crlf:
procedure;
call write$console (0dh);
call write$console (0ah);
end crlf;
/*****************************************************
Time & Date ASCII Conversion Code
*****************************************************/
declare BUFFER$ADR structure (
MAX$CHARS byte,
NUMB$OF$CHARS byte,
CONSOLE$BUFFER(21) byte)
initial(21,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0);
declare tod$adr address;
declare tod based tod$adr structure (
opcode byte,
date address,
hrs byte,
min byte,
sec byte,
ASCII (21) byte );
declare string$adr address;
declare string based string$adr (1) byte;
declare index byte;
declare lit literally 'literally',
forever lit 'while 1',
word lit 'address';
/* - - - - - - - - - - - - - - - - - - - - - - */
emitchar:
procedure(c);
declare c byte;
string(index := index + 1) = c;
end emitchar;
/*- - - - - - - - - - - - - - - - - - - - - - -*/
emitn:
procedure(a);
declare a address;
declare c based a byte;
do while c <> '$';
string(index := index + 1) = c;
a = a + 1;
end;
end emitn;
/*- - - - - - - - - - - - - - - - - - - - - - -*/
emit$bcd:
procedure(b);
declare b byte;
call emitchar('0'+b);
end emit$bcd;
/*- - - - - - - - - - - - - - - - - - - - - - -*/
emit$bcd$pair:
procedure(b);
declare b byte;
call emit$bcd(shr(b,4));
call emit$bcd(b and 0fh);
end emit$bcd$pair;
/*- - - - - - - - - - - - - - - - - - - - - - -*/
emit$colon:
procedure(b);
declare b byte;
call emit$bcd$pair(b);
call emitchar(':');
end emit$colon;
/*- - - - - - - - - - - - - - - - - - - - - - -*/
emit$bin$pair:
procedure(b);
declare b byte;
call emit$bcd(b/10);
call emit$bcd(b mod 10);
end emit$bin$pair;
/*- - - - - - - - - - - - - - - - - - - - - - -*/
emit$slant:
procedure(b);
declare b byte;
call emit$bin$pair(b);
call emitchar('/');
end emit$slant;
/*- - - - - - - - - - - - - - - - - - - - - - -*/
declare chr byte;
/*- - - - - - - - - - - - - - - - - - - - - - -*/
gnc:
procedure;
/* get next command byte */
if chr = 0 then return;
if index = 20 then
do;
chr = 0;
return;
end;
chr = string(index := index + 1);
end gnc;
/*- - - - - - - - - - - - - - - - - - - - - - -*/
deblank:
procedure;
do while chr = ' ';
call gnc;
end;
end deblank;
numeric:
procedure byte;
/* test for numeric */
return (chr - '0') < 10;
end numeric;
scan$numeric:
procedure(lb,ub) byte;
declare (lb,ub) byte;
declare b byte;
b = 0;
call deblank;
if not numeric then go to error;
do while numeric;
if (b and 1110$0000b) <> 0 then go to error;
b = shl(b,3) + shl(b,1); /* b = b * 10 */
if carry then go to error;
b = b + (chr - '0');
if carry then go to error;
call gnc;
end;
if (b < lb) or (b > ub) then go to error;
return b;
end scan$numeric;
scan$delimiter:
procedure(d,lb,ub) byte;
declare (d,lb,ub) byte;
call deblank;
if chr <> d then go to error;
call gnc;
return scan$numeric(lb,ub);
end scan$delimiter;
declare base$year lit '78', /* base year for computations */
base$day lit '0', /* starting day for base$year 0..6 */
month$size (*) byte data
/* jan feb mar apr may jun jul aug sep oct nov dec */
( 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31),
month$days (*) word data
/* jan feb mar apr may jun jul aug sep oct nov dec */
( 000,031,059,090,120,151,181,212,243,273,304,334);
leap$days:
procedure(y,m) byte;
declare (y,m) byte;
/* compute days accumulated by leap years */
declare yp byte;
yp = shr(y,2); /* yp = y/4 */
if (y and 11b) = 0 and month$days(m) < 59 then
/* y not 00, y mod 4 = 0, before march, so not leap yr */
return yp - 1;
/* otherwise, yp is the number of accumulated leap days */
return yp;
end leap$days;
declare word$value word;
get$next$digit:
procedure byte;
/* get next lsd from word$value */
declare lsd byte;
lsd = word$value mod 10;
word$value = word$value / 10;
return lsd;
end get$next$digit;
bcd:
procedure (val) byte;
declare val byte;
return shl((val/10),4) + val mod 10;
end bcd;
declare (month, day, year, hrs, min, sec) byte;
set$date:
procedure;
declare (i, leap$flag) byte; /* temporaries */
month = scan$numeric(1,12) - 1;
/* may be feb 29 */
if (leap$flag := month = 1) then i = 29;
else i = month$size(month);
day = scan$delimiter('/',1,i);
year = scan$delimiter('/',base$year,99);
/* ensure that feb 29 is in a leap year */
if leap$flag and day = 29 and (year and 11b) <> 0 then
/* feb 29 of non-leap year */ go to error;
/* compute total days */
tod.date = month$days(month)
+ 365 * (year - base$year)
+ day
- leap$days(base$year,0)
+ leap$days(year,month);
end SET$DATE;
SET$TIME:
procedure;
tod.hrs = bcd (scan$numeric(0,23));
tod.min = bcd (scan$delimiter(':',0,59));
if tod.opcode = 2
then
/* date, hours and minutes only */
do;
if chr = ':'
then i = scan$delimiter (':',0,59);
tod.sec = 0;
end;
/* include seconds */
else tod.sec = bcd (scan$delimiter(':',0,59));
end set$time;
bcd$pair:
procedure(a,b) byte;
declare (a,b) byte;
return shl(a,4) or b;
end bcd$pair;
compute$year:
procedure;
/* compute year from number of days in word$value */
declare year$length word;
year = base$year;
do forever;
year$length = 365;
if (year and 11b) = 0 then /* leap year */
year$length = 366;
if word$value <= year$length then
return;
word$value = word$value - year$length;
year = year + 1;
end;
end compute$year;
declare week$day byte, /* day of week 0 ... 6 */
day$list (*) byte data ('Sun$Mon$Tue$Wed$Thu$Fri$Sat$'),
leap$bias byte; /* bias for feb 29 */
compute$month:
procedure;
month = 12;
do while month > 0;
if (month := month - 1) < 2 then /* jan or feb */
leapbias = 0;
if month$days(month) + leap$bias < word$value then return;
end;
end compute$month;
declare date$test byte, /* true if testing date */
test$value word; /* sequential date value under test */
get$date$time:
procedure;
/* get date and time */
hrs = tod.hrs;
min = tod.min;
sec = tod.sec;
word$value = tod.date;
/* word$value contains total number of days */
week$day = (word$value + base$day - 1) mod 7;
call compute$year;
/* year has been set, word$value is remainder */
leap$bias = 0;
if (year and 11b) = 0 and word$value > 59 then
/* after feb 29 on leap year */ leap$bias = 1;
call compute$month;
day = word$value - (month$days(month) + leap$bias);
month = month + 1;
end get$date$time;
emit$date$time:
procedure;
call emitn(.day$list(shl(week$day,2)));
call emitchar(' ');
call emit$slant(month);
call emit$slant(day);
call emit$bin$pair(year);
call emitchar(' ');
call emit$colon(hrs);
call emit$colon(min);
call emit$bcd$pair(sec);
end emit$date$time;
tod$ASCII:
procedure (parameter);
declare parameter address;
declare ret address;
ret = 0;
tod$adr = parameter;
string$adr = .tod.ASCII;
if tod.opcode = 0 then
do;
call get$date$time;
index = -1;
call emit$date$time;
end;
else
do;
if (tod.opcode = 1) or
(tod.opcode = 2) then
do;
chr = string(index:=0);
call set$date;
call set$time;
ret = .string(index);
end;
else
do;
go to error;
end;
end;
end tod$ASCII;
/********************************************************
********************************************************/
declare lcltod structure (
opcode byte,
date address,
hrs byte,
min byte,
sec byte,
ASCII (21) byte );
declare datapgadr address;
declare datapg based datapgadr address;
declare extrnl$todadr address;
declare extrnl$tod based extrnl$todadr structure (
date address,
hrs byte,
min byte,
sec byte );
declare i byte;
declare ret address;
display$tod:
procedure;
lcltod.opcode = 0; /* read tod */
call mon1(50,.(26,0,0,0,0,0,0,0)); /* BIOS TIME GET SIGNAL */
call move (5,.extrnl$tod.date,.lcltod.date);
call tod$ASCII (.lcltod);
call write$console (0dh);
do i = 0 to 20;
call write$console (lcltod.ASCII(i));
end;
end display$tod;
comp:
procedure (cnt,parmadr1,parmadr2) byte;
declare (i,cnt) byte;
declare (parmadr1,parmadr2) address;
declare parm1 based parmadr1 (5) byte;
declare parm2 based parmadr2 (5) byte;
do i = 0 to cnt-1;
if parm1(i) <> parm2(i)
then return 0;
end;
return 0ffh;
end comp;
/**************************************
Main Program
**************************************/
declare last$dseg$byte byte initial (0);
declare CURRENT$VERSION address initial (0);
declare CPM30 byte initial (030h);
declare MPM byte initial (01h);
PLM:
do;
CURRENT$VERSION = RETURN$VERSION$FUNC;
if (low(CURRENT$VERSION) >= CPM30) and (high(CURRENT$VERSION) <> MPM) then
do;
datapgadr = xdos (49,.(03ah,0));
extrnl$todadr = xdos(49,.(03ah,0)) + 58H;
if (FCB(1) = 'C') then
do while FCB(1) = 'C';
if comp(5,.extrnl$tod.date,.lcltod.date) = 0 then
call display$tod;
if check$console$status then
do;
ret = read$console;
fcb(1) = 0;
end;
end;
else
if (FCB(1) = ' ') then
do;
call display$tod;
end;
else
if (FCB(1) = 'S')
then do;
call crlf;
call print$buffer(.('Enter today''s date (MM/DD/YY): ','$'));
call move(21,.(000000000000000000000),.buffer$adr.console$buffer);
call read$console$buffer(.buffer$adr);
if buffer$adr.numb$of$chars > 0
then do;
call move(21,.buffer$adr.console$buffer,.lcltod.ASCII);
tod$adr = .lcltod;
string$adr = .tod.ASCII;
chr = string(index := 0);
call set$date;
call move(2,.lcltod.date,.extrnl$tod.date);
end; /* date initialization */
call crlf;
call print$buffer(.('Enter the time (HH:MM:SS): ','$'));
call move(21,.(000000000000000000000),.buffer$adr.console$buffer);
call read$console$buffer(.buffer$adr);
if buffer$adr.numb$of$chars > 0
then do;
call move(21,.buffer$adr.console$buffer,.lcltod.ASCII);
tod$adr = .lcltod;
string$adr = .tod.ASCII;
chr = string(index := 0);
call set$time;
call crlf;
call print$buffer(.('Press any key to set time ','$'));
ret = read$console;
call move(3,.lcltod.hrs,.extrnl$tod.hrs);
call mon1(50,.(26,0,0ffh,0,0,0,0,0,)); /* BIOS TIME SET SIGNAL */
end;
call crlf;
end;
else do;
call move (21,.tbuff(1),.lcltod.ASCII);
lcltod.opcode = 1;
call tod$ASCII (.lcltod);
call crlf;
call print$buffer (.('Strike key to set time','$'));
ret = read$console;
call move (5,.lcltod.date,.extrnl$tod.date);
call mon1(50,.(26,0,0ffh,0,0,0,0,0,)); /* BIOS TIME SET SIGNAL */
call crlf;
end;
call terminate;
end;
else
do;
call CRLF;
call PRINT$BUFFER(.('ERROR: Requires CP/M3.','$'));
call CRLF;
call TERMINATE;
end;
end;
error:
do;
call crlf;
call print$buffer (.('ERROR: Illegal time/date specification.','$'));
call terminate;
end;
end tod;