426 lines
12 KiB
C
426 lines
12 KiB
C
********************************
|
|
* *
|
|
* MORE - UN*X MORE COMMAND *
|
|
* ASSEMBLES WITH MERLIN *
|
|
* BILL CHATFIELD *
|
|
* *
|
|
********************************
|
|
|
|
DSK MORE ;WRITE ASSEMBLED FILE TO DISK
|
|
TYP $06 ;$FF=SYSTEM, $06=BINARY
|
|
ORG $2000 ;ASSEMBLE START ADDRESS
|
|
|
|
* SYSTEM VARIABLES
|
|
|
|
IN EQU $200 ;256-CHAR INPUT BUF
|
|
|
|
* SUBROUTINES IN MONITOR ROM: $F800 - $FFFF
|
|
|
|
RDKEY EQU $FD0C ;READS A CHARACTER
|
|
GETLN EQU $FD6A ;READS A LINE, WITH PROMPT($33)
|
|
GETLN1 EQU $FD6F ;READS A LINE, NO PROMPT
|
|
CROUT EQU $FD8E
|
|
COUT EQU $FDED
|
|
PRBYTE EQU $FDDA
|
|
|
|
* PRODOS ENTRY POINT
|
|
|
|
MLI EQU $BF00
|
|
|
|
* MEMORY LOCATIONS
|
|
|
|
OURCH EQU $057B ;80-COL HORIZ CURSOR POSITION
|
|
OURCV EQU $05FB ;VERTICAL CURSOR POSITION
|
|
|
|
* PRODOS COMMAND CODES
|
|
|
|
OPENCMD EQU $C8
|
|
READCMD EQU $CA
|
|
CLOSCMD EQU $CC
|
|
|
|
* CONSTANTS
|
|
|
|
EOFERR EQU $4C ;ERROR CODE FOR END-OF-FILE
|
|
PTR EQU $06 ;ONLY FREE 0-PAGE LOCATION
|
|
MAXERCDE EQU $5A ;LARGEST ERROR CODE
|
|
CR EQU $0D ;ASCII CARRIAGE RETURN
|
|
CR_HIBIT EQU $8D ;CARRIAGE RET WITH HIGH BIT SET
|
|
BUFSIZE EQU $00FF
|
|
SCR_HGHT EQU 24 ;SCREEN HEIGHT
|
|
|
|
* DEBUGGING
|
|
|
|
TRACE EQU 0
|
|
|
|
********************************
|
|
* *
|
|
* PUSH Y ONTO THE STACK *
|
|
* DESTROYS A *
|
|
* *
|
|
********************************
|
|
|
|
PUSHY MAC
|
|
TYA
|
|
PHA
|
|
<<<
|
|
|
|
********************************
|
|
* *
|
|
* POP Y FROM THE STACK *
|
|
* DESTROYS A *
|
|
* *
|
|
********************************
|
|
|
|
POPY MAC
|
|
PLA
|
|
TAY
|
|
<<<
|
|
|
|
********************************
|
|
* *
|
|
* COPY IN BUF TO STRING *
|
|
* *
|
|
* X CONTAINS LENGTH OF "IN" *
|
|
* ]1 IS DEST STRING (LEN BYT) *
|
|
* A IS DESTROYED *
|
|
* *
|
|
********************************
|
|
|
|
CPIN MAC
|
|
PUSHY ;SAVE Y
|
|
STX ]1 ;COPY LENGTH TO FIRST BYTE OF ]1
|
|
LDY #0 ;INIT Y TO ZERO
|
|
LOOP CPY ]1 ;COMPARE Y WITH LENGTH BYTE
|
|
BEQ ENDLOOP ;DONE IF LENGTH IS REACHED
|
|
LDA IN,Y ;LOAD IN[Y] INTO ACCUMULATOR
|
|
CMP #CR ;COMPARE WITH CARRIAGE RETURN
|
|
BEQ ENDLOOP ;STOP AT CARRIAGE RETURN
|
|
INY ;DEST STR IS 1 AHEAD OF IN BUF
|
|
STA ]1,Y ;COPY CHAR TO DEST STR ]1
|
|
JMP LOOP ;LOOP TO NEXT CHAR
|
|
ENDLOOP POPY ;RESTORE Y
|
|
<<<
|
|
|
|
********************************
|
|
* *
|
|
* WRITES A LENGTH PREFIXED *
|
|
* STRING TO THE SCREEN *
|
|
* A IS DESTROYED *
|
|
* *
|
|
********************************
|
|
|
|
PUTS MAC
|
|
PUSHY
|
|
LDY #0 ;INIT LOOP INDEX
|
|
LOOP CPY ]1 ;HAS STR LENGTH BEEN REACHED
|
|
BEQ ENDLOOP ;IF SO THEN FINISH
|
|
INY ;MOVE TO INDEX OF NEXT CHAR
|
|
LDA ]1,Y ;GET THE CHAR TO BE WRITTEN
|
|
JSR COUT ;WRITE THE CHARACTER
|
|
JMP LOOP ;LOOP
|
|
ENDLOOP POPY
|
|
<<<
|
|
|
|
********************************
|
|
* *
|
|
* SET TO #1 (IMMEDIATE 1) *
|
|
* ]1 DESTINATION *
|
|
* A IS DESTROYED *
|
|
* *
|
|
********************************
|
|
|
|
SET1 MAC
|
|
LDA #1
|
|
STA ]1
|
|
<<<
|
|
|
|
SET0 MAC
|
|
LDA #0
|
|
STA ]1
|
|
<<<
|
|
|
|
SET23 MAC
|
|
LDA #23
|
|
STA ]1
|
|
<<<
|
|
|
|
********************************
|
|
* *
|
|
* MAIN PROGRAM *
|
|
* *
|
|
********************************
|
|
|
|
MAIN CLD ;CLEAR DECIMAL FLG, AVOID CRASH
|
|
SET0 USRQUIT ;INITIALIZE TO "NO"
|
|
*
|
|
* GET FILE NAME
|
|
*
|
|
PUTS PROMPT
|
|
JSR GETLN1 ;LENGTH IN X, CR AT END
|
|
CPX #0 ;IS THE LENGTH ZERO?
|
|
BEQ :END ;USER JUST PRESSED RETURN
|
|
CPIN FILENAME ;COPY "IN" BUF TO FILENAME
|
|
*
|
|
* OPEN FILE
|
|
*
|
|
JSR MLI
|
|
DB OPENCMD
|
|
DA OPENPRMS
|
|
BNE :ERRFWDR
|
|
*
|
|
* COPY FILE NUMBER FROM OPEN PARAMETERS TO READ AND CLOSE
|
|
*
|
|
LDA OPENFNUM
|
|
STA READFNUM
|
|
STA CLOSFNUM
|
|
*
|
|
* PRINT THE FILE
|
|
*
|
|
JSR VIEWFILE ;MUST CLOSE BEFORE ERR HANDLING
|
|
*
|
|
* CLOSE FILE
|
|
*
|
|
JSR MLI
|
|
DB CLOSCMD
|
|
DA CLOSPRMS
|
|
STA CLOSERR
|
|
*
|
|
* CHECK FOR ERRORS
|
|
*
|
|
LDA READERR ;RELOAD THE READ RESULT CODE
|
|
CMP EOFERR ;WAS IT AN EOF "ERROR"
|
|
BEQ :END ;EOF IS NOT REALLY AN ERROR
|
|
CMP #0
|
|
BNE :ERRFWDR
|
|
LDA CLOSERR
|
|
BNE :ERRFWDR
|
|
JMP :END
|
|
*
|
|
* FINISH
|
|
*
|
|
:ERRFWDR JSR ERRPROC
|
|
:END NOP
|
|
RTS
|
|
|
|
********************************
|
|
* *
|
|
* VIEW FILE SUB *
|
|
* *
|
|
********************************
|
|
|
|
VIEWFILE
|
|
DO TRACE
|
|
PUTS ENVIEW
|
|
FIN
|
|
|
|
SET1 LINENUM ;INIT LINE NUMBER
|
|
:LOOP JSR MLI ;CALL PRODOS TO READ FILE
|
|
DB READCMD ;SPECIFY PRODOS READ COMMAND
|
|
DA READPRMS ;READ PARAMETERS
|
|
STA READERR ;SAVE RESULT OF READ OPERATION
|
|
BNE :ENDLOOP ;IF ERROR THEN END SUB
|
|
JSR WRITEBUF ;WRITE TO SCREEN WHAT WAS READ
|
|
LDA #1 ;PREPARE FOR NEXT OP
|
|
CMP USRQUIT ;IF USER WANTS TO QUIT, THEN
|
|
BEQ :ENDLOOP ;EXIT THE LOOP
|
|
JMP :LOOP ;ELSE, GET THE NEXT BUFFER
|
|
:ENDLOOP NOP
|
|
RTS
|
|
|
|
********************************
|
|
* *
|
|
* WRITE BUFFER TO SCREEN *
|
|
* *
|
|
********************************
|
|
|
|
WRITEBUF
|
|
LDY #0 ;INIT CHAR COUNTER VARIABLE
|
|
:LOOP CPY READCNT ;COMPARE TO MAX CHARS
|
|
BEQ :ENDLOOP
|
|
LDA READBUF,Y ;GET CHAR FROM BUFFER
|
|
ORA #%10000000 ;TURN ON HIGH BIT FOR PRINTING
|
|
JSR COUT ;WRITE IT TO THE SCREEN
|
|
*
|
|
* CHECK END OF LINE
|
|
*
|
|
LDA READBUF,Y ;LOAD AGAIN, WITHOUT HIBIT
|
|
AND #%01111111 ;TURN OFF HIBIT, IF SET
|
|
CMP #CR ;COMPARE TO CR WITHOUT HIBIT
|
|
BNE :CONT ;IF NOT END OF LINE, NEXT CHAR
|
|
INC LINENUM ;NEXT LINE HAS BEEN REACHED
|
|
*
|
|
* CHECK AT END OF PAGE
|
|
*
|
|
LDA LINENUM
|
|
CMP #SCR_HGHT ;AT BOTTOM OF SCREEN?
|
|
BNE :CONT ;NO? THEN NEXT CHAR
|
|
JSR STATBAR ;YES? THEN SHOW THE STATUS BAR
|
|
LDA #1 ;SETUP FOR NEXT LINE
|
|
CMP USRQUIT ;DID USER ASK TO QUIT
|
|
BEQ :ENDLOOP ;YES? THEN END SUB
|
|
:CONT INY ;STATBAR HAS ADJUSTED LINENUM
|
|
JMP :LOOP
|
|
:ENDLOOP NOP
|
|
|
|
DO TRACE
|
|
PUTS EXVIEW
|
|
FIN
|
|
|
|
RTS
|
|
|
|
********************************
|
|
* *
|
|
* PRINT ASCII IN HEX *
|
|
* *
|
|
********************************
|
|
|
|
PRASCII PHA
|
|
LDA #"["
|
|
JSR COUT
|
|
PLA
|
|
JSR PRBYTE
|
|
LDA #"]"
|
|
JSR COUT
|
|
LDA #" "
|
|
JSR COUT
|
|
RTS
|
|
|
|
********************************
|
|
* *
|
|
* DO THE STATUS BAR *
|
|
* *
|
|
********************************
|
|
|
|
STATBAR
|
|
DO TRACE
|
|
PUTS ENSTATB
|
|
FIN
|
|
|
|
PUSHY
|
|
PUTS BAR
|
|
:LOOP JSR RDKEY ;GET A KEY FROM THE USER
|
|
CMP #" " ;CHECK IF SPACE ENTERED
|
|
BNE :CHKCR ;IF NOT FORWARD TO NEXT CHECK
|
|
SET1 LINENUM ;ADVANCE ONE PAGE, STORE 1
|
|
JMP :ENDLOOP ;PROCESSED SPACE SO DONE
|
|
:CHKCR CMP #CR_HIBIT ;CHECK FOR CARRIAGE RETURN
|
|
BNE :CHKQUIT
|
|
SET23 LINENUM
|
|
JMP :ENDLOOP
|
|
:CHKQUIT CMP #"Q" ;USER WANTS TO QUIT
|
|
BNE :LOOP ;NO RECOGNIZED INPUT
|
|
SET1 USRQUIT
|
|
:ENDLOOP JSR ERASEBAR
|
|
POPY
|
|
|
|
DO TRACE
|
|
PUTS EXSTATB
|
|
FIN
|
|
|
|
RTS
|
|
|
|
********************************
|
|
* *
|
|
* ERASE STATUS BAR *
|
|
* *
|
|
********************************
|
|
|
|
ERASEBAR
|
|
DO TRACE
|
|
PUTS ENERASEB
|
|
FIN
|
|
|
|
PUSHY
|
|
SET0 OURCH ;RESET CURSOR TO BEG OF LINE
|
|
LDY #0 ;INIT COUNTER FOR SPACES
|
|
:LOOP CPY BAR ;FIRST BYTE IS LENGTH
|
|
BEQ :ENDLOOP ;IF Y=LEN THEN DONE
|
|
LDA #" " ;LOAD SPACE
|
|
JSR COUT ;WRITE TO SCREEN
|
|
INY ;MAKE PROGRESS
|
|
JMP :LOOP ;LOOP TO NEXT CHAR
|
|
:ENDLOOP SET0 OURCH ;RESET CURSON TO BEG OF LINE
|
|
POPY
|
|
|
|
DO TRACE
|
|
PUTS EXERASEB
|
|
FIN
|
|
|
|
RTS
|
|
|
|
********************************
|
|
* *
|
|
* ERROR HANDLER *
|
|
* *
|
|
********************************
|
|
|
|
ERRPROC STA ERRCODE
|
|
PUTS ERRTXT
|
|
JSR PRBYTE
|
|
JSR CROUT
|
|
RTS
|
|
|
|
********************************
|
|
* *
|
|
* DATA DIVISION HAHA *
|
|
* *
|
|
********************************
|
|
|
|
PROMPT STR "FILE:"
|
|
ERRTXT STR "ERROR:"
|
|
FILENAME DS $FF
|
|
HERE STR "HERE"
|
|
HERE2 STR "HERE2"
|
|
READRET STR "READRET="
|
|
SREADCNT STR "READCNT="
|
|
ERRCODE DS 1
|
|
READERR DS 1
|
|
CLOSERR DS 1
|
|
LINENUM DS 1
|
|
BAR STR '[RET] NEXT LINE [SPC] NEXT PAGE [Q]UIT'
|
|
USRQUIT DS 1
|
|
BUFCHAR DS 1
|
|
USRCHAR DS 1
|
|
I DS 1
|
|
|
|
ENVIEW STR 'ENTERING VIEWFILE'
|
|
EXVIEW STR 'EXITING VIEWFILE'
|
|
ENSTATB STR 'ENTERING STATUSBAR'
|
|
EXSTATB STR 'EXITING STATUSBAR'
|
|
ENERASEB STR 'ENTERING ERASEBAR'
|
|
EXERASEB STR 'EXITING ERASEBAR'
|
|
|
|
|
|
* OPEN PARAMETERS
|
|
|
|
OPENPRMS DB 3
|
|
DA FILENAME
|
|
DA OPENBUF
|
|
OPENFNUM DS 1
|
|
|
|
* READ PARAMETERS
|
|
|
|
READPRMS DB 4
|
|
READFNUM DS 1
|
|
DA READBUF
|
|
REQCNT DW BUFSIZE
|
|
READCNT DS 2
|
|
|
|
* CLOSE PARAMETERS
|
|
|
|
CLOSPRMS DB 1
|
|
CLOSFNUM DS 1
|
|
|
|
* REST GOES HERE
|
|
|
|
|
|
* BUFFERS
|
|
|
|
* CONSUME ALL BYTES UP TO THE NEXT PAGE BOUNDRY
|
|
FILLER DS \,$00
|
|
* MUST START ON PAGE BOUNDRY
|
|
OPENBUF DS 1024
|
|
READBUF DS BUFSIZE
|
|
|
|
:
|