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695 lines
24 KiB
Plaintext
695 lines
24 KiB
Plaintext
;C02 Module file.h02 Assembly Language Routines
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;for all Commodore 8 bit machines
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; Requires error code definitions from error.a02,
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; External routines FSFLFA, RESRXY, STRLEN
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; and the following RAM locations definitions
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; external zero page byte pairs SRCLO,SRCHI and DSTLO,DSTHI
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; and external bytes TEMP1, TEMP2
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; NOTE: Reading from CASSETTE will not produce an EOF
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;Kernal Device Numbers
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KEYBRD EQU 0
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CASST1 EQU 1
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MODEM1 EQU 2
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SCREEN EQU 3
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PRNTR1 EQU 4
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PRNTR2 EQU 5
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PRNTR3 EQU 6
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PRNTR4 EQU 7
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DRIVE1 EQU 8
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DRIVE2 EQU 9
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DRIVE3 EQU 10
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DRIVE4 EQU 11
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DRIVE5 EQU 12
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DRIVE6 EQU 13
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DRIVE7 EQU 14
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DRIVE8 EQU 15
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;Disk Numbers (Within Drive)
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DISK0 EQU $00
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DISK1 EQU $40
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;File Open Modes
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MWRITE EQU $80
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MREAD EQU $00
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;File Load Modes
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MABSLT EQU $80 ;Absolute (Use File Header Address)
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MRELCT EQU $00 ;Relocate (Use Specified Address)
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;File Types
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FTASC EQU $00 ;ASCII Text (SEQ)
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FTBAS EQU $10 ;Basic Program (PRG)
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FTBIN EQU $20 ;Binary File (PRG)
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FTUSR EQU $30 ;User-Defined (USR)
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;Zero Page System Variables (Names Subject to Change)
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FSIOST EQU $90 ;Kernal I/O Status Word
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FSNOFL EQU $98 ;Number of Open I/O Files
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FSRCVB EQU $A4 ;Serial Bus Received Byte
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FSSVLO EQU $AC ;Save Address (Low Byte)
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FSSVHI EQU $AD ;Save Address (High Byte)
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FSFNLN EQU $B7 ;Length of Current Filename
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FSLFNO EQU $B8 ;Current Logical File Number
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FSSADR EQU $B9 ;Current Secondary Address
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FSDVNO EQU $BA ;Current Device Number
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FSFNLO EQU $BB ;Pointer: Current Filename (LSB)
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FSFNHI EQU $BC ;Pointer: Current Filename (MSB)
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;IEC STATUS Bit Masks
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FSSTTO EQU $03 ;Disk - Read/Write Timeout $21 //Error - Operation Timed Out
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FSSTSB EQU $04 ;Tape - Short Block
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FSSTLB EQU $08 ;Tape - Long Block
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FSSTRE EQU $10 ;Tape - Read Error
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FSSTCE EQU $20 ;Both - Checksum Error
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FSSTEF EQU $40 ;Both - End of File
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FSSTNP EQU $80 ;Disk - Device Not Present
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FSSTET EQU $80 ;Tape - End of Tape
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;RS-232 Status Bit Masks
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;$01 - Parity Error
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;$02 - Framing Error
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;$04 - Receive Overrun
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;$10 - CTS Missing
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;$40 - DSR Missing
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;$80 - BREAK Detected
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;fsioet[15] - I/O Error Table by Channel Number
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FSIOET EQU $0140 ;Bottom of BASIC Stack Area
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;fscntr - File Counter
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FSCNTR EQU $0150 ;Byte Following Error Table
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;fsbufr - Buffer for String Concatenation
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FSBUFR EQU $0200 ;BASIC Line Editor Input Buffer
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;Error Code Conversion Tables
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;FSCSST DC FSSSPE,FSSSFE,FSSSRO,FSSSCM,FSSSDM,FSSSBD
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FSCSTT DC FSSTTO,FSSTSB,FSSTLB,FSSTRE,FSSTCE ;STATUS to Error Code
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;String Constants
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FSCMDI DC "I",0 ;Command - Initialize Drive
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FSWSFX DC ",S,W",0 ;Filename Suffix for Write
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;fsbcmd(command) - Build Disk Command String
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;Args: A = Disk Command (Single Letter Abbreviation)
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;Uses: FSBUFR = Command String
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; TEMP2 = Mode/Option Byte
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FSBCMD: STA FSBUFR ;Store Command in FSBUFR[0]
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JSR FSDSKN ;Get Disk Number
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STA FSBUFR+1 ;and Store in FSBUFR[1]
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LDA #58 ;Load ':'
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STA FSBUFR+2 ;and Store in FSBUFR[2]
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LDA #0 ;Load String Terminator
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STA FSBUFR+3 ;and Store in FSBUFR[3]
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RTS
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;fsdskn() - Get Disk Number
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;Uses: TEMP2 = Mode/Option Byte
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;Returns: A = Disk Number "0" or "1"
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FSDSKN: LDA TEMP2 ;Get Option Byte
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AND #$01 ;Isolate Drive Number
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ORA #$30 ;Convert to ASCII
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RTS
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;fschan(chan) - Find Channel Info
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;Args: A = Logical File Number
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;Uses: $0259 = LAT File number table
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; $0263 = FAT Device number table
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; $026D = SAT Secondary address table
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;Returns: A = Device Number
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; Y = Secondary Address
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; X = Index into File Tables
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; $FF if Channel Not Open
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FSCHAN: JSR FSFLFA ;Find File Table Index
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BMI FSCHAX ;If Found
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LDA $026D,X ;Load Secondary Address into Y
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TAY
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LDA $0263,X ;Load Device Number into X
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FSCHAX: RTS
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;fsinit(device) - Initialize Disk Drive
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;Args: A = Device Number
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; Y,X = Pointer to Command String
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;Uses: FSBUFR - String Concatenation Buffer
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;Sets: TEMP2 = Number of Bytes Read from Drive
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;Returns: A = Drive Status Code
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; Y = Kernal or I/O Error
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FSINIT: LDX #<FSCMDI ;Load Pointer to Command String
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LDY #>FSCMDI ;and Fall Trhough to FSDCMD
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;fsdcmd(device) - Send Command to Drive
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;Args: A = Device Number
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; Y,X = Pointer to Command String
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;Uses: FSBUFR - String Concatenation Buffer
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;Sets: TEMP2 = Number of Bytes Read from Drive
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;Returns: A = Drive Status Code
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; Y = Kernal or I/O Error
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FSDCMD: JSR SETSRC ;Save Command String Pointer
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JSR FSOCMD ;Open Command Channel
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BEQ FSCHAX ;If Not Open, Return
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ORA #$80 ;Set flag to Emit C/R
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JSR FPUTSA ;Call fputs() - Alternate Entry Point
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BCC FSDSTR ;If No Error, Get Disk Status
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RTS ;Else Return
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;fscste(status) - Convert STATUS byte into Error Code
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FSCSTE: LDY #5 ;Set Index to Table Size
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FSCSTL: AND FSCSTT-1,Y ;Mask Bits Against Table Entry
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BNE FSCSTS ;If Bits Not Set
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DEY ; Decrement Index
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BNE FSCSTL ; and Loop if Not Zero
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FSCSTS: TYA ;Copy Index to Accumulator
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BEQ FSCSTX ;If Not Zero
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ORA #$10 ; Convert from $0x to $1x
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FSCSTX: RTS
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;fscdst(status) - Convert Drive Status
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;Args: A = Drive Status Code
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;Returns: Y = Converted Error Code
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;fsdsts(device) - Get Drive Status
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;Args: A = Device Number
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;Uses: FSBUFR - String Concatenation Buffer
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;Returns: A = Drive Status Code
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; Y = Kernal or I/O Error
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FSDSTS: JSR FSOCMD ;Open Command Channel
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BCS FSCHAX ;If Error, Return
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FSDSTR: JSR FSRCMD ;Read Command Channel
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BEQ FSDSTX ;If Bytes Read
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JSR FSGBFR ; Get Buffer Address
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JSR ATOC ; Convert Error# to Byte
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LDY #0 ; Set Error to 0
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FSDSTX: RTS ;and Return
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;fscbfr() - Copy Source String to String Buffer
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;Args: C = Mode
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;Uses: SRCLO,SRCHI = Pointer to Source String
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FSCBFR: JSR FSGBFR ;Get String Buffer Address
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JSR SETDST ;Set Buffer as Destination
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LDY #0 ;Initialize Index
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BCS FSCBFS ;If Carry Clear
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JMP STRCPL ; Copy String
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FSCBFS: JMP STRCAL ;Else Concatenate String
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;fsgbfr() - Get String Buffer Address
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FSGBFR: LDX #<FSBUFR ;Load LSB into X
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LDY #>FSBUFR ;Load MSB into Y
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RTS
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;fsocmd(device) - Open Command Channel
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;Args: A = Device Number
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;Returns: A = Logical File Number
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FSOCMD: ORA #$10 ;Set LFN to Device# + 16
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JSR FSFLFA ;Find File Table Index
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BPL FSCHAX ;If Already Open, Return
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TAX ;Copy Device Number to X
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FSOCMX: LDA #0 ;Set Filename to None
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JSR $FFBD ;Call Kernal SETNAM Routine
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FSET15: LDA #15 ;Set LFN to 15
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BNE FSOPEY ;Copy to SA and Open Channel
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;fsname(&s) - Set Filename for Load, Save
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;Args: Y,X = Pointer to string containing filename
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FSNAME: JSR STRLEN ;Get Length of String
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JSR GETSRC ;Retrieve String Address
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JMP $FFBD ;Execute Kernal SETNAM Routine
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;fsonam(&s) - Set Filename for Open
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;Args: Y,X = Pointer to string containing filename
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FSONAM: LDA TEMP1 ;Get Device Number
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AND TEMP2 ;AND with Mode/Option
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AND #$08 ;Check Disk + Write Bit
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BEQ FSNAME ;Execute FSNAME/FSWNAM
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;fswnam(&s) - Set Filename for Write to Disk
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;Args: Y,X = Pointer to string containing filename
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FSWNAM: JSR SETSRC ;Set Filename as Source
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CLC ;Set Flag to Copy
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JSR FSCBFR ;and Copy to String Buffer
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LDX #<FSWSFX
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LDY #>FSWSFX
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JSR STRCAT ;Append Write Suffix
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JSR FSGBFR ;Get String Buffer Address
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JMP $FFBD ;Execute Kernal SETNAM Routine
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;fsldsv() - Setup for Load and Save
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;Args: A = Logical File Number
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; Y = Mode
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; X = Device Number
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;Returns: Y,X = Destination Address (DSTHI,DSTLO)
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FSLDSV: PHA ;Save LFN
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TYA ;Copy Mode to Accumulator
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LSR ;Rotate Bit 3 to Bit 1
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LSR
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LSR
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TAY ;Use as Secondary Address
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PLA ;Restore LFN
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JSR $FFBA ;Call Kernal SETLFS Routine
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JMP GETDST ;Get Load/End Address into X,Y
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;fsopts() - Parse Load/Save/Open Options Byte
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;Args: A = Combined Options Byte
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; Bits 0-3 = Device Number
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; Bits 4-7 = Mode/Option
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;Sets: TEMP0 = Combined Option
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; TEMP1 = Device
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; TEMP2 = Mode/Option
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; Bit 1 = Disk Number
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; Bits 1-2 = File Type
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; Bit 3 = Mode (0=Read/1=Write)
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;Returns: A = Mode/Option
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FSOPTS: STA TEMP0 ;Save Argument
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AND #$0F ;Isolate Device Number
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STA TEMP1 ;and Save it
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LDA TEMP0 ;Restore Argument
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LSR ;Shift to Low Nybble
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LSR
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LSR
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LSR
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STA TEMP2 ;and Save it
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RTS
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;fsopen(chan, mode, device) - Open Channel to Device
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;Requires prior call to FSNAME
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;Args: A = Logical File Number
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; Y = Mode: 0=Read, !0= Write
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; X = Device 0=Keyboard, 1=Cassette, 2=RS232, 3=Screen
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; 4-7=Printers, 8-15=Disks, 31=All Devices
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;Returns: A,X = Channel Number (0=Error)
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; Y = Error Number (0=None)
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FSOPEN: CPX #1
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BNE FSOPEY ;If Device is Cassette
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CPY #0
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BEQ FSOPEZ ; If Mode is Not Zero
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LDY #2 ; Set Secondary Address to 2
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BNE FSOPEZ ;Else
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FSOPEY: TAY ; Copy LFN to Secondary Address
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FSOPEZ: JSR $FFBA ;Call Kernal SETLFS Routine
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JSR $FFC0 ;Call Kernal OPEN Routine
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BCS FSERRV ;If Error Return A=0, Y=Error#
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BCC FSOPED ;** Skip Drive Check for now; **
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LDA FSDVNO ;Get Current Device Number
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CMP #8 ;Check Device Number
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BCC FSOPED ;If Disk Drive
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JSR FSDSTS ; Get Drive Status
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BCS FSERRV ; If Error Return A=0, Y=Error#
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FSOPED: LDA #0 ;Set Error Code to 0
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STA FSIOET ;Clear General Error Entry
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LDX FSLFNO ;Get LFN
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STA FSIOET,X ;Clear Error Table Entry
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TAY ;Clear Error Code
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TXA ;Return LFN
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RTS
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;fsload(chan, mode, device) - Load File from Device
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;Requires: DSTLO,DSTHI = Load Address
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; Prior call to FSNAME
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;Args: A = Logical File Number
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; Y = Mode: 0=Read, !0= Write
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; X = Device 1=Cassette, 8-15=Disks
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;Returns: A = Error Number (0=None)
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; Y,X = Address at Last Byte Loaded
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FSLOAD: JSR FSLDSV ;Set up for Load/Save
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LDA TEMP3 ;Get Load/Verify Flag
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FSLOAK: JSR $FFD5 ;Call Kernal LOAD Routine
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BCC FSZERO ;If No Error, Return 0
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RTS
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;fssave(chan, mode, device) - Save File to Device
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;Requires: DSTLO,DSTHI = Load Address
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; Prior call to FSNAME
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;Args: A = Logical File Number
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; Y = Mode: 0=Read, !0= Write
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; X = Device 1=Cassette, 8-15=Disks
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;Returns: A = Error Number (0=None)
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; Y,X = Address at Last Byte Loaded
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FSSAVE: JSR FSLDSV ;Set up for Load/Save
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LDA #FSSVLO ;Load Start Address Pointer
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JSR $FFD8 ;Call Kernal SAVE Routine
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BCC FSZERO ;If No Error, Return 0
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RTS
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;fsrdst() - Read I/O Status Byte
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;Replaces Kernal READST Routine, fixing RS-232 bug,
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;bypassing Kernal messages, and preserving Accumulator
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;Affects: X
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;Returns: Carry Set if Error
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; Overflow Set if EOF
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; Y = I/O Status
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; Bit Cassette Read Serial Bus I/O Tape Load/Verify
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; $01 Write Timeout
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; $02 Read Timeout
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; $04 Short Block Short Block
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; $08 Long Block Long Block
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; $10 Read Error Any Mismatch
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; $20 Checksum Err Checksum Err
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; $40 End of File EOI Line
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; $80 End of Tape Device Not Present End of Tape
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FSRDST: TAX ;Save Accumulator
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CLV ;Clear Overflow Flag
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LDY $BA ;Get Current Device Number
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CPY #$02 ;Check Device Number
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BNE FSRDSS ;If Serial Port
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LDA $0297 ; Read RS-232 Status Word
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LDY #0 ; then
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STY $0297 ; Clear It
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BEQ FSRDSX ;Else
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FSRDSS: LDA FSIOST ; Load I/O Status Byte
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BIT FSIOST ; EOF Bit into Overflow Flag
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BEQ FSRDSX ; If Error
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BVS FSRDSX ; And Not EOF
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JSR FSCSTE ; Convert ST into Error
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FSRDSX: LDY FSLFNO ;Get Logical File Number
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STA FSIOET,Y ;Save Error in Table
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BVC FSRDSY ;If EOF
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AND #$BF ; Clear EOF Flag
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FSRDSY: CMP #1 ;Set Carry if Error
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TAY ;Copy Error Code to Y
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TXA ;Restore Accumulator
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RTS
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;fsunch() - Find Unused Channel Number
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;Affects: X,Y
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;Returns: A = Channel Number
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; 0=No Channel Available
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FSUNCH: LDY #2 ;Start with Channel 2
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FSUNCL: TYA ;Copy Channel to Accumulator`
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JSR FSFLFA ;Find File Table Index
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BMI FSUNCX ;If Channel Allocated
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INY ; Increment Channel
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CPY #15 ; If less than 15
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BCC FSUNCL ; Loop
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LDY #0 ; Else Return 0
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FSUNCX: TYA ;Copy Channel to Set Flags
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RTS
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;fscdrv() - Check if Device is Disk Drive
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;Uses: TEMP1 = Device Number
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;Returns: A = Device Number
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; 0 if Not a Disk Drive
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; Y = Error Code
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; 0 = None
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FSCDRV: LDA TEMP1 ;Get Device Number
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FSCDRA: CMP #8 ;If >=8
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BCS FSRTS ; Return
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;fserr7() - Return General Error 7
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FSERR7: LDA #7 ;Set Error to Illegal Device Number
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DC $2C ;BIT - Skip Next Instruction
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;fserr2() - Return General Error 2
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FSERR2: LDA #2 ;Set Error to 2
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;fserrv(error) - Write General Error Entry
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FSERRV: LDX #0 ;Set No Logical File Number
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DC $2C ;BIT - Skip Next Instruction
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;fserrw() - Write Error To Table and Return in Y
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FSERRW: LDX FSLFNO ;Get Logical File Number
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FSERRX: STA FSIOET,X ;Save Error To Table
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FSERRY: TAY ;Move Error Code to Y
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FSZERO: LDA #0 ;Return 0
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FSRTS: RTS
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;fload(args, &name) - Load File
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;Args: A = Mode + Device #
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; Y,X = Pointer to File Name
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;Returns: A = Error Number (0=None)
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; Y,X = Address at Last Byte Loaded
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FLOAD: JSR FSOPTS ;Parse Options Argument
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LDA #0 ;Set Flag to LOAD
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FLOADA: STA TEMP3 ;and Save It
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JSR FSNAME ;Set Filename for Open
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JSR FSUNCH ;Find Unused Channel Number
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BEQ FSERR2 ;If None Available, Return Error
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JSR RESRXY ;Load Device, Mode into X, Y
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JMP FSLOAD ;and Load File
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;fsave(args, &name) - Save File
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;Requires: SRCLO,SRCHI = Start Address
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; DSTLO,DSTHI = End Address
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;Args: A = Mode + Device #
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; Y,X = Pointer to File Name
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;Returns: A = Error Number (0=None)
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; Y,X = Address at Last Byte Loaded
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FSAVE: JSR SAVREG ;Save Arguments
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JSR GETSRC ;Get Start Address
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STX FSSVLO ;and Store It
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STY FSSVHI
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JSR RESREG ;Restore Arguments
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JSR FSOPTS ;Parse Options Argument
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JSR FSNAME ;Set Filename for Open
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JSR FSUNCH ;Find Unused Channel Number
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BEQ FSERR2 ;If None Available, Return 0
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JSR RESRXY ;Load Device, Mode into X, Y
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JMP FSSAVE ;and Load File
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;fvrfy(args, &name) - Verify File
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;Args: A = Mode + Device #
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; Y,X = Pointer to File Name
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;Returns: A = Error Number (0=None)
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; Y,X = Address at Last Byte Loaded
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FVRFY: JSR FSOPTS ;Parse Options Argument
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LDA #1 ;Set Flag to VERIFY
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BNE FLOADA ;Execute FLOAD Alternate Entry Point
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;fopen(args, &name) - Open File
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;Args: A = Mode + Device #
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; Y,X = Pointer to File Name
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;Returns: A = File Channel (0=File Not Opened)
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; Y = File Error (0=None)
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FOPEN: JSR FSOPTS ;Parse Options Argument
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FOPENA: JSR FSONAM ;Set Filename for Open
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JSR FSUNCH ;Find Unused Channel Number
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BEQ FSERR2 ;If None Available, Return Error 2
|
|
JSR RESRXY ;Load Device, Mode into X, Y
|
|
JMP FSOPEN ;and Open File
|
|
|
|
;fsccmd() - Close Command Channel
|
|
;Args: A = Device Number
|
|
;Returns: A = Logical File Number
|
|
FSCCMD: ORA #$10 ;Set LFN to Device# + 16
|
|
|
|
;fclose(chan) - Close File
|
|
;Args: A = Channel Number (0=Close All)
|
|
FCLOSE: ORA #0 ;Check File Number
|
|
BEQ FCLOSS ;If Not 0
|
|
JMP $FFC3 ; Execute Kernal Routine CLOSE
|
|
FCLOSS: JMP $FFE7 ;Else Execute Kernal Routine CLALL
|
|
|
|
;feof(lfn) - Check for End of File
|
|
;Args: A = Logical file number
|
|
;Affects: A,X
|
|
;Returns: A = $FF If End of File
|
|
; $00 Otherwise
|
|
FEOF: JSR FERROR ;Get Error Code
|
|
AND #$40 ;Mask off EOF Bit
|
|
BEQ FEOFX ;If Not 0
|
|
FSTRUE: LDA #$FF ; Return TRUE
|
|
FEOFX: RTS ;Return from Subroutine
|
|
|
|
;ferror(lfn) - Get Error on Channel`
|
|
;Args: A = Channel Number (0=None)
|
|
;Returns: A = Error Code
|
|
; 1 = Terminated by the STOP key
|
|
; 2 = Too many open files
|
|
; 3 = File Not Open
|
|
; 4 = File not found
|
|
; 5 = Device not present
|
|
; 6 = Not an input file
|
|
; 7 = Not an output file
|
|
; 8 = File name is missing
|
|
; 9 = Illegal device number
|
|
FERROR: TAX ;Copy LFN to X
|
|
LDA FSIOET,X ;Load I/O Status for LFN
|
|
RTS
|
|
|
|
;fflush() - Flush file buffer
|
|
;Args: A = Logical File Number
|
|
FFLUSH: RTS ;No Logic Needed
|
|
|
|
;fgetc(lfn) - Read character from file
|
|
;Args: A = Logical file number
|
|
;Affects: X
|
|
;Returns: A = Character
|
|
; Y = Error Code (0=None)
|
|
FGETC: TAX ;Move logical file number to X register
|
|
JSR $FFC6 ;Call Kernal Routine CHKIN
|
|
FGETCW: BCS FSERRW ;If Error, Write to Table and Return in Y
|
|
JSR $FFCF ;Call Kernal Routine CHRIN
|
|
TAY ;Save Character
|
|
FGETCC: JSR $FFCC ;Call Kernal Routine CLRCHN
|
|
TYA ;Restore Character
|
|
JSR FSRDST ;Read Status Byte
|
|
BVS FSORA0 ;If Not EOF
|
|
BCS FSZERO ;and Error, Return NUL
|
|
FSORA0: ORA #0 ;Else Set Flags Based on Character
|
|
RTS
|
|
|
|
;fsrcmd() - Read Command Channel
|
|
FSRCMD: LDA #15 ;Set LFN to 15
|
|
JSR FSGBFR ;Get Buffer Address
|
|
|
|
;fgets(lfn, &s) - Read string from file
|
|
;Args: A = Logical file number
|
|
; Y,X = Pointer to String
|
|
;Affects: X
|
|
;Returns: A = Number of bytes read
|
|
; Y = Error Code
|
|
FGETS: JSR SETDST ;Save string address
|
|
TAX ;Move logical file number to X register
|
|
JSR $FFC6 ;Call Kernal Routine CHKIN
|
|
BCS FGETCW ;If Error, Write to Table and Return in Y
|
|
LDY #0 ;Initialize Index
|
|
FGETSL: STY TEMP3 ;and Save It
|
|
JSR $FFCF ;Call Kernal Routine CHRIN
|
|
LDY TEMP3 ;Restore Index
|
|
CMP #$0D ;If Not C/R (Real or from Error)
|
|
BEQ FGETSX
|
|
STA (DSTLO),Y ;Store Character in String
|
|
INY ;Increment Pointer
|
|
BPL FGETSL ;and Loop if Less Than 128
|
|
FGETSX: LDA #0 ;Store NUL Terminator
|
|
STA (DSTLO),Y ;at End of String
|
|
JSR $FFCC ;Call Kernal Routine CLRCHN
|
|
TYA ;Copy Length of String to Acuumulator
|
|
JSR FSRDST ;Get I/O Status in Y Register
|
|
ORA #0 ;Set Flags based on Accumulator
|
|
FGETSR: RTS
|
|
|
|
;fread(lfn, count) - Read bytes from file
|
|
;Requires: DSTLO, DSTHI - Pointer to destination string
|
|
;Args: A = Logical file number
|
|
; Y = Number of Bytes to Read
|
|
;Sets: TEMP1 = Number of Bytes to Read
|
|
; TEMP2 = 0 (Read Mode)
|
|
; TEMP3 = Number of Bytes Read
|
|
;Affects: X
|
|
;Returns: A = Number of bytes read
|
|
; Y = Error Code (0=None)
|
|
; Carry Set if Error, Clear if None
|
|
FREAD: LDX #0 ;Mode = READ
|
|
FREADA: STX TEMP2 ;Save Mode
|
|
STY TEMP1 ;Save Number of Bytes
|
|
TAX ;Move logical file number to X register
|
|
JSR $FFC6 ;Call Kernal Routine CHKIN
|
|
FREADE: BCS FGETCW ;If Error, Write to Table and Return in Y
|
|
LDY #0 ;Initialize Index
|
|
STY TEMP3 ;and Save It
|
|
FREADL: JSR $FFCF ;Call Kernal Routine CHRIN
|
|
JSR FSRDST ;Get I/O Status in Y Register
|
|
BCS FREADX ;If No Error
|
|
LDY TEMP3 ; Retrieve Index
|
|
LDX TEMP2 ; Get Mode
|
|
BNE FREADN ; If READ
|
|
STA (DSTLO),Y ; Store Character in String
|
|
FREADN: INY ; Increment Pointer
|
|
STY TEMP3 ; and Save It
|
|
BVS FREADS ; If Not EOF
|
|
CPY TEMP1 ; Compare against Count
|
|
BNE FREADL ; and Loop if Less
|
|
FREADS: LDY #0 ; Set Error to None
|
|
FREADX: JSR $FFCC ;Call Kernal Routine CLRCHN
|
|
CLC ;Clear Carry
|
|
TYA ;Copy Error Code to Accumulator
|
|
ADC #$FF ;Set Carry if Error
|
|
LDA TEMP3 ;Return Length of String
|
|
RTS
|
|
|
|
;fputc(lfn, chr) - Write character from file
|
|
;Args: A = Logical file number
|
|
; Y = Character to Write
|
|
;Returns: A = Character (0 if Error)
|
|
; Y = Error Code (0=None)
|
|
FPUTC: TAX ;Move LFN to X register
|
|
JSR $FFC9 ;Call Kernal Routine CHKOUT
|
|
BCS FREADE ;If Error, Write to Table and Return in Y
|
|
TYA ;Copy Character to Accumulator
|
|
FPUTCO: JSR $FFD2 ;Call Kernal Routine CHROUT
|
|
JMP FGETCC ;Clear Channel and Check STATUS
|
|
|
|
;fputln(lfn, &s) - Write Line to File
|
|
;Args: A = Logical file number
|
|
; Y,X = Pointer to String
|
|
;Sets: SRCLO,SRCHI = Pointer to String
|
|
;Affects: X,Y
|
|
;Returns: A = Number of bytes written
|
|
; Y = Error Code (0=None)
|
|
FPUTLN: ORA #$80 ;Set High Bit and Fall Through
|
|
|
|
;fputs(lfn, &s) - Write String to File
|
|
;Args: A = Logical file number
|
|
; Y,X = Pointer to String
|
|
;Sets: SRCLO,SRCHI = Pointer to String
|
|
;Affects: X,Y
|
|
;Returns: A = Number of bytes written
|
|
; Y = Error Code (0=None)
|
|
FPUTS: JSR SETSRC ;Save string address & initialize pointer
|
|
FPUTSA: STA TEMP2 ;Save LFN Argument
|
|
AND #$7F ;Strip High Bit
|
|
TAX ;Copy LFN to X Register
|
|
JSR $FFC9 ;Call Kernal Routine CHKOUT
|
|
BCS FREADE ;If Error, Write to Table and Return in Y
|
|
LDY #0 ;Initialize Index
|
|
STY TEMP3 ;and Save It
|
|
FPUTSL: LDA (SRCLO),Y ;Load next character
|
|
BEQ FPUTSX ;If NUL, Finish Up
|
|
JSR $FFD2 ;Call Kernal Routine CHROUT
|
|
STY TEMP3 ;Save Index
|
|
JSR FSRDST ;Read I/O Status
|
|
BCS FREADX ;If Error, Return in Y
|
|
LDY TEMP3 ;Restore Index
|
|
INY ;Increment Index
|
|
BPL FPUTSL ;Loop if Less than 128
|
|
BMI FREADS ;Else Finish Up
|
|
FPUTSX: LDA TEMP2 ;Retrieve LFN Argument
|
|
BPL FREADS ;Finish Up if High Bit Not Set
|
|
INY ;Else Increment Count
|
|
LDA #$0D ;Load Carriage Return
|
|
BNE FPUTCO ;and Write It
|
|
|
|
FSKIP: LDX #$FF ;Set Mode to Skip
|
|
BNE FREADA ;and Execute FREAD
|
|
|
|
;fwrite(lfn, count) - Write bytes from file
|
|
;Requires: SRCLO, SRCHI - Pointer to destination string
|
|
;Args: A = Logical File Number
|
|
; Y = Number of Bytes to Write
|
|
;Affects: X
|
|
;Returns: A = Number of bytes read
|
|
; Y = Error Code (0=None)
|
|
FWRITE: STY TEMP1 ;Save Number of Bytes
|
|
TAX ;Move logical file number to X register
|
|
JSR $FFC9 ;Call Kernal Routine CHKOUT
|
|
BCS FREADE ;If Error, Return in Y (FSERRY)
|
|
LDY #0 ;Initialize Index
|
|
STY TEMP3 ;and Save It
|
|
FWRITL: LDA (SRCLO),Y ;Load next character
|
|
JSR $FFD2 ;Call Kernal Routine CHROUT
|
|
JSR FSRDST ;Read I/O Status
|
|
BCS FREADX ;If Error, Return In Y
|
|
INC TEMP3 ;Increment Index
|
|
LDY TEMP3 ;and Load it Index
|
|
CPY TEMP1 ;Compare against Count
|
|
BNE FWRITL ;and Loop if Less
|
|
BEQ FREADS ;Else Return No Error
|
|
|
|
;fgetw(lfn) - Read Word from File
|
|
;Args: A = Logical file number
|
|
;Sets: TEMP0 = Logical File Number
|
|
; TEMP1 = LSB
|
|
; TEMP2 = MSB
|
|
;Returns: A = Error Code (0=None)
|
|
; Y,X = Word (MSB, LSB)
|
|
FGETW: STA TEMP0 ;Save LFN
|
|
FGETWA: LDA TEMP0 ;Load LFN (Alternate Entry Point)
|
|
JSR FGETC ;Read LSB
|
|
BCS FGETWX ;If No Error
|
|
STA TEMP1 ; Save in TEMP1
|
|
LDA TEMP1 ; Restore LFN
|
|
JSR FGETC ; Read MSB
|
|
STA TEMP2 ; Save in TEMP2
|
|
FGETWX: TYA ;Copy Error to A
|
|
JSR RESRXY ;Load Word into Y,X
|
|
ORA #0 ;Set Flags
|
|
RTS
|
|
|