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https://github.com/SEPPDROID/Digital-Research-Source-Code.git
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1 line
9.9 KiB
Plaintext
1 line
9.9 KiB
Plaintext
$title ('MP/M 1.1 Date and Time')
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tod:
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do;
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$include (copyrt.lit)
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/*
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Revised:
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19 Jan 80 by Thomas Rolander
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*/
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declare start label;
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declare jmp$to$start structure (
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jmp$instr byte,
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jmp$location address ) data (
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0C3H,
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.start-3);
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mon1:
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procedure (func,info) external;
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declare func byte;
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declare info address;
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end mon1;
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mon2:
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procedure (func,info) byte external;
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declare func byte;
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declare info address;
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end mon2;
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mon2a:
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procedure (func,info) address external;
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declare func byte;
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declare info address;
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end mon2a;
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declare xdos literally 'mon2a';
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declare fcb (1) byte external;
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declare fcb16 (1) byte external;
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declare tbuff (1) byte external;
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read$console:
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procedure byte;
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return mon2 (1,0);
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end read$console;
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write$console:
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procedure (char);
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declare char byte;
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call mon1 (2,char);
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end write$console;
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print$buffer:
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procedure (buffer$address);
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declare buffer$address address;
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call mon1 (9,buffer$address);
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end print$buffer;
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check$console$status:
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procedure byte;
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return mon2 (11,0);
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end check$console$status;
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terminate:
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procedure;
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call mon1 (143,0);
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end terminate;
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crlf:
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procedure;
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call write$console (0dh);
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call write$console (0ah);
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end crlf;
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/*****************************************************
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Time & Date ASCII Conversion Code
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*****************************************************/
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declare tod$adr address;
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declare tod based tod$adr structure (
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opcode byte,
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date address,
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hrs byte,
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min byte,
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sec byte,
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ASCII (21) byte );
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declare string$adr address;
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declare string based string$adr (1) byte;
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declare index byte;
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declare lit literally 'literally',
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forever lit 'while 1',
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word lit 'address';
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emitchar: procedure(c);
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declare c byte;
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string(index := index + 1) = c;
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end emitchar;
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emitn: procedure(a);
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declare a address;
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declare c based a byte;
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do while c <> '$';
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string(index := index + 1) = c;
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a = a + 1;
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end;
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end emitn;
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emit$bcd: procedure(b);
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declare b byte;
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call emitchar('0'+b);
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end emit$bcd;
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emit$bcd$pair: procedure(b);
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declare b byte;
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call emit$bcd(shr(b,4));
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call emit$bcd(b and 0fh);
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end emit$bcd$pair;
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emit$colon: procedure(b);
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declare b byte;
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call emit$bcd$pair(b);
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call emitchar(':');
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end emit$colon;
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emit$bin$pair: procedure(b);
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declare b byte;
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call emit$bcd(b/10);
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call emit$bcd(b mod 10);
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end emit$bin$pair;
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emit$slant: procedure(b);
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declare b byte;
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call emit$bin$pair(b);
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call emitchar('/');
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end emit$slant;
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declare chr byte;
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gnc: procedure;
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/* get next command byte */
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if chr = 0 then return;
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if index = 20 then
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do;
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chr = 0;
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return;
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end;
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chr = string(index := index + 1);
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end gnc;
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deblank: procedure;
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do while chr = ' ';
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call gnc;
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end;
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end deblank;
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numeric: procedure byte;
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/* test for numeric */
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return (chr - '0') < 10;
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end numeric;
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scan$numeric: procedure(lb,ub) byte;
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declare (lb,ub) byte;
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declare b byte;
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b = 0;
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call deblank;
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if not numeric then go to error;
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do while numeric;
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if (b and 1110$0000b) <> 0 then go to error;
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b = shl(b,3) + shl(b,1); /* b = b * 10 */
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if carry then go to error;
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b = b + (chr - '0');
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if carry then go to error;
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call gnc;
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end;
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if (b < lb) or (b > ub) then go to error;
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return b;
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end scan$numeric;
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scan$delimiter: procedure(d,lb,ub) byte;
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declare (d,lb,ub) byte;
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call deblank;
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if chr <> d then go to error;
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call gnc;
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return scan$numeric(lb,ub);
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end scan$delimiter;
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declare
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base$year lit '78', /* base year for computations */
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base$day lit '0', /* starting day for base$year 0..6 */
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month$size (*) byte data
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/* jan feb mar apr may jun jul aug sep oct nov dec */
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( 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31),
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month$days (*) word data
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/* jan feb mar apr may jun jul aug sep oct nov dec */
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( 000,031,059,090,120,151,181,212,243,273,304,334);
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leap$days: procedure(y,m) byte;
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declare (y,m) byte;
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/* compute days accumulated by leap years */
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declare yp byte;
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yp = shr(y,2); /* yp = y/4 */
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if (y and 11b) = 0 and month$days(m) < 59 then
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/* y not 00, y mod 4 = 0, before march, so not leap yr */
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return yp - 1;
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/* otherwise, yp is the number of accumulated leap days */
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return yp;
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end leap$days;
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declare word$value word;
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get$next$digit: procedure byte;
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/* get next lsd from word$value */
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declare lsd byte;
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lsd = word$value mod 10;
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word$value = word$value / 10;
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return lsd;
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end get$next$digit;
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bcd:
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procedure (val) byte;
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declare val byte;
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return shl((val/10),4) + val mod 10;
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end bcd;
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declare (month, day, year, hrs, min, sec) byte;
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set$date$time: procedure;
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declare
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(i, leap$flag) byte; /* temporaries */
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month = scan$numeric(1,12) - 1;
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/* may be feb 29 */
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if (leap$flag := month = 1) then i = 29;
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else i = month$size(month);
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day = scan$delimiter('/',1,i);
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year = scan$delimiter('/',base$year,99);
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/* ensure that feb 29 is in a leap year */
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if leap$flag and day = 29 and (year and 11b) <> 0 then
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/* feb 29 of non-leap year */ go to error;
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/* compute total days */
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tod.date = month$days(month)
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+ 365 * (year - base$year)
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+ day
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- leap$days(base$year,0)
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+ leap$days(year,month);
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tod.hrs = bcd (scan$numeric(0,23));
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tod.min = bcd (scan$delimiter(':',0,59));
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if tod.opcode = 2 then
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/* date, hours and minutes only */
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do;
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if chr = ':'
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then i = scan$delimiter (':',0,59);
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tod.sec = 0;
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end;
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/* include seconds */
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else tod.sec = bcd (scan$delimiter(':',0,59));
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end set$date$time;
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bcd$pair: procedure(a,b) byte;
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declare (a,b) byte;
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return shl(a,4) or b;
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end bcd$pair;
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compute$year: procedure;
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/* compute year from number of days in word$value */
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declare year$length word;
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year = base$year;
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do forever;
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year$length = 365;
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if (year and 11b) = 0 then /* leap year */
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year$length = 366;
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if word$value <= year$length then
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return;
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word$value = word$value - year$length;
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year = year + 1;
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end;
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end compute$year;
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declare
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week$day byte, /* day of week 0 ... 6 */
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day$list (*) byte data
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('Sun$Mon$Tue$Wed$Thu$Fri$Sat$'),
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leap$bias byte; /* bias for feb 29 */
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compute$month: procedure;
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month = 12;
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do while month > 0;
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if (month := month - 1) < 2 then /* jan or feb */
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leapbias = 0;
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if month$days(month) + leap$bias < word$value then return;
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end;
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end compute$month;
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declare
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date$test byte, /* true if testing date */
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test$value word; /* sequential date value under test */
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get$date$time: procedure;
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/* get date and time */
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hrs = tod.hrs;
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min = tod.min;
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sec = tod.sec;
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word$value = tod.date;
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/* word$value contains total number of days */
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week$day = (word$value + base$day - 1) mod 7;
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call compute$year;
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/* year has been set, word$value is remainder */
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leap$bias = 0;
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if (year and 11b) = 0 and word$value > 59 then
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/* after feb 29 on leap year */ leap$bias = 1;
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call compute$month;
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day = word$value - (month$days(month) + leap$bias);
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month = month + 1;
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end get$date$time;
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emit$date$time: procedure;
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call emitn(.day$list(shl(week$day,2)));
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call emitchar(' ');
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call emit$slant(month);
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call emit$slant(day);
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call emit$bin$pair(year);
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call emitchar(' ');
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call emit$colon(hrs);
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call emit$colon(min);
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call emit$bcd$pair(sec);
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end emit$date$time;
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tod$ASCII:
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procedure (parameter);
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declare parameter address;
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declare ret address;
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ret = 0;
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tod$adr = parameter;
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string$adr = .tod.ASCII;
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if tod.opcode = 0 then
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do;
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call get$date$time;
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index = -1;
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call emit$date$time;
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end;
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else
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do;
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if (tod.opcode = 1) or
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(tod.opcode = 2) then
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do;
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chr = string(index:=0);
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call set$date$time;
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ret = .string(index);
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end;
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else
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do;
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go to error;
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end;
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end;
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end tod$ASCII;
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/********************************************************
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********************************************************/
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declare lcltod structure (
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opcode byte,
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date address,
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hrs byte,
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min byte,
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sec byte,
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ASCII (21) byte );
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declare datapgadr address;
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declare datapg based datapgadr address;
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declare extrnl$todadr address;
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declare extrnl$tod based extrnl$todadr structure (
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date address,
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hrs byte,
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min byte,
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sec byte );
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declare i byte;
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declare ret address;
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display$tod:
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procedure;
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lcltod.opcode = 0; /* read tod */
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call move (5,.extrnl$tod.date,.lcltod.date);
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call tod$ASCII (.lcltod);
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call write$console (0dh);
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do i = 0 to 20;
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call write$console (lcltod.ASCII(i));
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end;
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end display$tod;
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/*
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Main Program
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*/
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declare last$dseg$byte byte
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initial (0);
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start:
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do;
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datapgadr = xdos (154,0) + 252;
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extrnl$todadr = datapg;
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if (fcb(1) <> ' ') and (fcb(1) <> 'P') then
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do;
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call move (21,.tbuff(1),.lcltod.ASCII);
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lcltod.opcode = 1;
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call tod$ASCII (.lcltod);
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call print$buffer (.(
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'Strike key to set time','$'));
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ret = read$console;
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call move (5,.lcltod.date,.extrnl$tod.date);
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call crlf;
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end;
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do while fcb(1) = 'P';
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call display$tod;
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if check$console$status then
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do;
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ret = read$console;
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fcb(1) = 0;
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end;
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end;
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call display$tod;
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call terminate;
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end;
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error:
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do;
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call print$buffer (.(
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'Illegal time/date specification.','$'));
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call terminate;
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end;
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end tod;
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