164 lines
8.7 KiB
ArmAsm
164 lines
8.7 KiB
ArmAsm
;-*-MIDAS-*-
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TITLE SUDOKU SOLVER
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A=1 ;Define ACs as universal registers
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B=2 ;from A to E
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C=3
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D=4
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E=5
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X=10 ;X and Y are used for indexing
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Y=11 ;loops etc.
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P=17 ;Define P as the stack pointer.
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PDLLEN==30 ;Set the size of the stack to 30 words.
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PDL: BLOCK PDLLEN ;Reserve the stack memory
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BPTR==440700 ;Define a byte pointer, easier to write...
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CHTTYO==1 ;Define a channel for TTY output.
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CHDSKI==2 ;Read channel for disk input.
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JCL: BLOCK 30 ;Reserve space for the command line.
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FNAME1: BLOCK 15 ;The first part of the file name.
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FNAME2: BLOCK 15 ;The second file name.
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FIELD: BLOCK 9 ;Reserve 9 words to store the grid.
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;Print flags
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;Allows to change the beavihour of the OUTSTR and PUTLN subroutines.
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;The different bits in the word have different meanings.
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;Flags:
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; 001 - SIXBIT: Prints the next character as a SIXBIT char, instead of ASCII, if set.
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PFLAGS: BLOCK 1
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START: MOVE P,[-PDLLEN,,PDL-1] ;Initialize the stack.
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.OPEN CHTTYO,[.UAO,,'TTY] ;Open an output channel on the TTY.
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.LOSE %LSFIL ;Gobble up any errors.
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MOVEI A,000 ;Initialize the print flag
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MOVEM A,PFLAGS ;to print ASCII
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MOVE A,[BPTR,,WELCOME] ;Print the welcome message
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PUSHJ P,PUTLN
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PUSHJ P,GETJCL ;Read the command line.
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MOVE A,[BPTR,,LOADING] ;Print the loading message
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PUSHJ P,OUTSTR
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MOVEI A,FIELD ;Store the address of field in C
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PUSHJ P,IMPRTF ;Load the file
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PUSHJ P,PFIELD ;Print the loaded field.
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JRST DONE ;Jump to the end of the program.
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;Subroutine to read the JCL from DDT and get the command line parameters.
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GETJCL: PUSH P,A ;Save the register A.
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PUSH P,B ;Save the register B.
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SETZM JCL ;Zero out the JCL
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MOVE A,[JCL,,JCL+30]
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BLT A,JCL+30
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.BREAK 12,[..RJCL,,JCL] ;Request the JCL.
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MOVE A,[JCL]
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MOVE A,[BPTR,,JCL] ;Load the command parameters into A.
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MOVE B,[BPTR,,FNAME1] ;Pointer to the first file name.
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;PUSHJ P,TOSIXB ;Transfer the first word into FNAME1
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MOVE B,[BPTR,,FNAME2] ;Pointer to the second file name.
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;PUSHJ P,TOSIXB ;Transfer the second word into FNAME2
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POP P,B ;Restore the B register.
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POP P,A ;Restore the A register.
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POPJ P, ;Return from routine.
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;Subroutine to convert an ASCII string into SIXBIT. Takes a byte
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;pointer in A and B, where A is the source and B is the destination.
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TOSIXB: PUSH P,D ;Store the contents of register D.
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TOSLP: ILDB D,A ;Load the next character from A.
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JUMPE D,TOSEN ;Exit the loop, if charachter is null.
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CAIN D,40 ;If the character is a whitespace,
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JUMPA TOSEN ;exit the loop.
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CAIL D,140 ;If the character is > 96,
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SUBI D,40 ;then cut it down, so it's in range.
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SUBI D,40 ;Convert 32..95 to 0..63
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IDPB D,B ;Deposit the character in the destination.
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JRST TOSLP ;Repeat with next character.
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TOSEN: POP P,D ;Restore the D register.
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POPJ P, ;Return from function.
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;Subroutine to print a string of text on the output.
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;Clobbers A.
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OUTSTR: PUSH P,B ;Save register B.
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PUSH P,D ;Save register D.
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HRLI A,BPTR ;Ensure, A is a byte pointer.
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OUT: ILDB B,A ;Load the next byte from A.
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JUMPE B,OUTEX ;Exit the routine, if all bytes are done.
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MOVE D,PFLAGS ;Load the print flags.
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TRNE D,001 ;Test, if the SIXBIT flag is set.
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ADDI B,40 ;Convert SIXBIT to ASCII.
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.IOT CHTTYO,B ;Print a character.
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JRST OUT ;Jump back to print the next character.
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OUTEX: POP P,D ;Restore D to its original value.
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POP P,B ;Restore B to its original value.
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POPJ P, ;Return from the output routine.
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;Subroutine to print an entire line of text, including a line break.
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;Clobbers A and B.
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PUTLN: PUSHJ P,OUTSTR ;Calls the OUTSTR subroutine
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.IOT CHTTYO,[^M] ;Print a carriage return
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.IOT CHTTYO,[^J] ;and a new line
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POPJ P, ;before returning.
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;Subroutine to that prints the entire play field.
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;The contents of the field is expected in FIELD
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PFIELD: PUSH P,A ;Save the A register.
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PUSH P,B ;Save the contents of register B.
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PUSH P,X ;Save the contents of the index register.
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PUSH P,Y ;Save the contents of the Y register
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MOVE X,[440400,,FIELD] ;Store a bytepointer in X.
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PFIELN: .IOT CHTTYO,[^M] ;Print a carriage return.
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.IOT CHTTYO,[^J] ;Print a new line.
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MOVE A,[BPTR,,HLINE] ;Print a horizontal line.
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POPJ P,PUTLN
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MOVEI Y,011 ;Load the index register with 9.
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MOVEI B,174 ;Print a '|' symbol.
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.IOT CHTTYO,B
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PFIENO: MOVEi B,020 ;Print a space.
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.IOT CHTTYO,B
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ILDB B,X ;Load the next field.
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JUMPE B,PFIEEX ;Exit, if no more elements are read.
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ADDI B,060 ;Convert number into char.
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.IOT CHTTYO,B ;Print the number.
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.IOT CHTTYO,[ ] ;Print a space.
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.IOT CHTTYO,[|] ;Print the vertical line.
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SOJE Y,PFIELN ;End the line and start a new one.
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JUMPA PFIENO ;Jump back to print the next number.
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PFIEEX: POP P,Y ;Restore the Y register.
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POP P,X ;Restore the index register.
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POP P,B ;Restore the B register.
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POP P,A ;Restore the A register.
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POPJ P, ;Return from the subroutine.
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;Subroutine that reads the contents of the file into the buffer at FIELD
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IMPRTF: PUSH P,A ;Save the A register.
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PUSH P,B ;Save the B register.
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PUSH P,X ;Save the index register.
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MOVE X,[440400,,FIELD] ;Init a 4-bit byte pointer to FIELD.
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.CALL [SETZ ? SIXBIT/OPEN/ ;Open a file descriptor.
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[.UAI,,CHDSKI] ? [SIXBIT/DSK/] ;Mode, channel and device name
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? FNAME1 ? FNAME2 ((SETZ))]
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.LOSE %LSFIL ;Handle errors after opening the file
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IMPRD: .IOT CHDSKI,A ;Read an ascii char into A.
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JUMPL A,IMPREX ;If there was nothing read, exit.
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CAIGE A,060 ;Is A >= '0' then skip,
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JUMPA IMPRD ;else read the next char.
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CAILE A,071 ;If A <= '9', then skip.
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JUMPA IMPRD ;else, read the next char.
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SUBI A,060 ;Convert A from the num char into int.
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IDPB A,X ;Store the byte and increment.
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JUMPA IMPRD ;Jump back to read the next byte.
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IMPREX: .CALL [SETZ ? SIXBIT/CLOSE/ ;Close the file, before returning.
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[,,CHDSKI] ((SETZ))]
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.LOSE %LSFIL
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POP P,X ;Restore the X register.
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POP P,B ;Restore the B register
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POP P,A ;Restore the A register.
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POPJ P, ;Return from the input subroutine,
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DONE: .LOGOUT 2, ;Exit point for the program.
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WELCOME:ASCIZ /SUDOKU SOLVER v0.1/ ;Text of the welcome banner.
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LOADING:ASCIZ /LOADING / ;Load message.
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HLINE: ASCIZ /|---|---|---|---|---|---|---|---|---|/ ;A horizontal line.
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END START
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