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https://github.com/bobbimanners/Zapple-II.git
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Further improvements to CCP parser
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Bobbi Webber-Manners
parent
20e655d617
commit
6d9e8f5604
@ -1572,8 +1572,8 @@ N2FL3 INC HL ; Advance source pointer
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LD A,(HL) ; Read character
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CP '.' ; See if it is a period
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JP Z,N2FS2 ; Prepare to copy the extension
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CP ' ' ; See if it is a space ** NEED THIS? **
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JP Z,N2FS3 ; If so, we are done ** NEED THIS? **
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CP ' ' ; See if it is a space ** TODO:STILL NEED THIS? **
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JP Z,N2FS3 ; If so, we are done ** TODO:STILL NEED THIS? **
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LD (DE),A ; Write character
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INC B ; Increment count of chars written
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N2FS1 DEC C ; Decrement count of chars remaining
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@ -1948,42 +1948,10 @@ CCPS1 CP 3 ; Check if three chars
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JP CCPL1 ; Go again
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; Attempt to load .COM file from disk
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CCPS2 LD HL,FCB1 ; Set DMAADDR to point to FCB1
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LD (DMAADDR),HL ; ...
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LD HL,FILEBUF+1 ; Skip over capacity byte
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LD A,(FILEBUF+3) ; See if second char typed is a colon
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CP ':' ;
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JP NZ,CCPS3 ; If not then skip to default drive
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LD A,(FILEBUF+2) ; Get the drive letter
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SUB 'A'-1 ; Convert to 1-based drive number
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LD B,A ; In B for NAME2FCB
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LD A,(HL) ; Get the string length
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SUB 2 ; Eat drive letter and colon
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INC HL ; ...
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INC HL ; ...
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LD (HL),A ; Write the reduced length
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JP CCPS4 ;
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CCPS3 LD A,(CURDRV) ; Get drive and user number
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AND 0FH ; Mask out user number
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INC A ; FCB drive numbers are 1-based
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LD B,A ; Always use default drive
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CCPS4
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; TODO: Shouldn't use FCB1 for this!
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CALL NAME2FCB ; Create FCB at FCB1
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LD A,'C' ; Set extension to .COM, in case not typed
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LD (FCB1NAM+8),A ;
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LD A,'O' ;
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LD (FCB1NAM+9),A ;
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LD A,'M' ;
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LD (FCB1NAM+10),A ;
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CALL CMDTAIL ; Process the command tail (ie: arguments)
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CCPS2 CALL PARSE ; Parse the command line
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LD HL,0080H ; Reset DMAADDR to 0080H
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LD (DMAADDR),HL ; ...
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LD DE,FCB1 ; Point to our new FCB
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LD DE,FCB1 ; Use FCB1
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LD DE,PATHBUF2 ; Point to the FCB in PATHBUF2
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CALL RUNCOM ; Try to run .COM file
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JP CCP ; Go again
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@ -2005,8 +1973,9 @@ UCL1 LD A,C ; See if any chars are left
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UCS1 LD (HL),A ; Put converted char back
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JP UCL1 ; Loop
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; Handle the command tail
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; Parse the command line
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; Replaces the contents of FILEBUF with command tail as Pascal-style string
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; Creates FCB for loading .COM program
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; B is used to keep track of the parser state machine:
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; 0 in whitespace before command
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; 1 in command
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@ -2014,12 +1983,16 @@ UCS1 LD (HL),A ; Put converted char back
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; 3 in first argument
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; 4 in whitespace segment following first argument
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; 5 in second argument
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CMDTAIL LD HL,FILEBUF+1 ; Skip first byte - buffer capacity
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PUSH HL ; HL->IX. Use IX as destination pointer.
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PARSE LD HL,PATHBUF+1 ; Skip first byte - buffer capacity
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PUSH HL ; HL->IY. Use IY as dest pointer into PATHBUF
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POP IY ; ...
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LD HL,FILEBUF+1 ; Skip first byte - buffer capacity
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PUSH HL ; HL->IX. Use IX as dest pointer into FILEBUF
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POP IX ; ...
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LD C,(HL) ; Get the length of source string
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LD B,0 ; B is the state of the parser
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LD D,0 ; D is the count of chars output
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LD D,0 ; D is the count of chars for FILEBUF
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LD E,0 ; E is the count of chars for PATHBUF
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CTL1 LD A,C ; See if any chars are left in input
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CP 0 ; ...
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JP Z,CTS2 ; If 0, go update the length byte
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@ -2036,28 +2009,76 @@ CTS2 LD HL,FILEBUF ; First byte is length of string
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LD (HL),D ; Write string length
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RET
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; Examines Pascal string pointed to by HL to see if it begins with a drive
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; letter and a colon. If so, reduces string length by 2 and advances HL two
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; positions, sets B to the drive number. If no drive is specified, sets B
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; to the default drive.
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DRVLETTER INC HL ; Advance to second char
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INC HL ; ...
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LD A,(HL) ; See if second char typed is a colon
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CP ':' ;
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JP NZ,DLS1 ; If not then skip to default drive
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DEC HL ; Back to first char
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LD A,(HL) ; Get the drive letter
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SUB 'A'-1 ; Convert to 1-based drive number
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LD B,A ; In B for NAME2FCB
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DEC HL ; Back one to the size byte
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LD A,(HL) ; Get the string length
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SUB 2 ; Eat drive letter and colon
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INC HL ; ...
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INC HL ; ...
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LD (HL),A ; Write the reduced length
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RET
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DLS1 DEC HL ; Put HL back to the beginning
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DEC HL ; ...
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LD A,(CURDRV) ; Get drive and user number
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AND 0FH ; Mask out user number
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INC A ; FCB drive numbers are 1-based
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LD B,A ; Always use default drive
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RET
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; Handle a space character in the command line
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; State 0: Do not emit space to FILEBUF.
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; State 1: Do not emit space to FILEBUF. -> State 2
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; State 2: Do not emit space to FILEBUF.
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; State 3: Emit space to FILEBUF. -> State 4
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; State 4: Do not emit space to FILEBUF.
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; State 5: Emit space to FILEBUF.
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CMDSPC LD E,A ; Put character in E
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; Character is passed in A
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; State 0: Do not emit space to FILEBUF
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; State 1: Do not emit space to FILEBUF
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; Set length byte for PATHBUF & create FCB.
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; -> State 2
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; State 2: Do not emit space to FILEBUF
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; State 3: Emit space to FILEBUF -> State 4
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; State 4: Do not emit space to FILEBUF
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; State 5: Emit space to FILEBUF
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CMDSPC EX AF,AF' ; Save character for later
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LD A,B ; Get parser state
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CP 0 ; State 0 - eat the space
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JP NZ,CSS1 ;
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RET ;
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CSS1 CP 1 ; State 1 - eat the space
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JP NZ,CSS2 ;
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LD A,E ; Write length byte to PATHBUF
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LD (PATHBUF),A ; ...
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LD E,0 ; Reset length for next time
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PUSH HL ; Preserve HL
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LD HL,PATHBUF2 ; DMAADDR to PATHBUF2 - will put FCB there
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LD (DMAADDR),HL ; ...
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LD HL,PATHBUF ; NAME2FCB will use filename at PATHBUF
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CALL DRVLETTER ; Handle any x: drive letter prefix
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CALL NAME2FCB ; Create FCB at PATHBUF2
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LD A,'C' ; Set extension to .COM, in case not typed
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LD (PATHBUF2+9),A ; ...
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LD A,'O' ; ...
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LD (PATHBUF2+10),A ; ...
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LD A,'M' ; ...
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LD (PATHBUF2+11),A ; ...
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INC B ; Transition to state 2
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POP HL ; Restore HL
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RET ;
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CSS2 CP 2 ; State 2 - eat the space
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JP NZ,CSS3 ;
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RET ;
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CSS3 CP 3 ; State 3
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JP NZ,CSS4 ;
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LD (IX+0H),E ; Just emit the space
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EX AF,AF' ; Get character back
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LD (IX+0H),A ; Just emit the space
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INC IX ; ...
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INC D ; Character count
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INC B ; Transition to state 4
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@ -2067,52 +2088,68 @@ CSS4 CP 4 ; State 4 - eat the space
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RET ;
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CSS5 CP 5 ; State 5
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JP NZ,CSS6 ;
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LD (IX+0H),E ; Just emit the space
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EX AF,AF' ; Get character back
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LD (IX+0H),A ; Just emit the space
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INC IX ; ...
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INC D ; Character count
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CSS6 RET
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; Handle a non-space character in the command line
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; State 0: Do not emit character to FILEBUF. -> State 1
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; State 1: Do not emit character to FILEBUF.
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; State 2: Emit character to FILEBUF. -> State 3
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; State 3: Emit character to FILEBUF.
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; State 4: Emit character to FILEBUF. -> State 5
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; State 5: Emit character to FILEBUF.
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CMDNSPC LD E,A ; Put character in E
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; Character is passed in A
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; State 0: Do not emit character to FILEBUF -> State 1
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; Emit character to PATHBUF
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; State 1: Do not emit character to FILEBUF
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; Emit character to PATHBUF
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; State 2: Emit character to FILEBUF -> State 3
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; State 3: Emit character to FILEBUF
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; State 4: Emit character to FILEBUF -> State 5
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; State 5: Emit character to FILEBUF
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CMDNSPC EX AF,AF' ; Save character for later
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LD A,B ; Get parser state
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CP 0 ; State 0 - eat the character
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JP NZ,CNS1 ;
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EX AF,AF' ; Get character back
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LD (IY+0H),A ; Emit char to PATHBUF
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INC IY ; ...
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INC E ; Character count for PATHBUF
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INC B ; Transition to state 1
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RET ;
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CNS1 CP 1 ; State 1 - eat the character
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JP NZ,CNS2 ;
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EX AF,AF' ; Get character back
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LD (IY+0H),A ; Emit char to PATHBUF
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INC IY ; ...
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INC E ; Character count for PATHBUF
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RET ;
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CNS2 CP 2 ; State 2
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JP NZ,CNS3 ;
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LD (IX+0H),E ; Emit the character
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EX AF,AF' ; Get character back
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LD (IX+0H),A ; Emit char to FILEBUF
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INC IX ; ...
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INC D ; Character count
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INC D ; Character count for FILEBUF
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INC B ; Transition to state 3
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RET ;
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CNS3 CP 3 ; State 3
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JP NZ,CNS4 ;
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LD (IX+0H),E ; Emit the character
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EX AF,AF' ; Get character back
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LD (IX+0H),A ; Emit char to FILEBUF
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INC IX ; ...
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INC D ; Character count
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INC D ; Character count for FILEBUF
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RET ;
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CNS4 CP 4 ; State 3
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JP NZ,CNS5 ;
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LD (IX+0H),E ; Emit the character
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EX AF,AF' ; Get character back
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LD (IX+0H),A ; Emit char to FILEBUF
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INC IX ; ...
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INC D ; Character count
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INC D ; Character count for FILEBUF
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INC B ; Transition to state 5
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RET ;
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CNS5 CP 5 ; State 5
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JP NZ,CNS6 ;
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LD (IX+0H),E ; Emit the character
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EX AF,AF' ; Get character back
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LD (IX+0H),A ; Emit char to FILEBUF
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INC IX ; ...
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INC D ; Character count
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INC D ; Character count for FILEBUF
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CNS6 RET
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; Load and run a .COM file to 0100H
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Binary file not shown.
BIN
zapple2.po
BIN
zapple2.po
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