mirror of https://github.com/RevCurtisP/C02.git
Fixes and updates to Standard Library
This commit is contained in:
Curtis F Kaylor
parent
627ce4df19
commit
6336eca68c
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@ -83,8 +83,7 @@ ISCTL: CMP #$7F ;If Char = DEL
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JMP ISBCS ; Return Carry Set Else Return Carry Clear
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ISBIN: CMP #$32 ;If Char >= '2'
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BCS ISCLC ; Return Carry Clear
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BCS ISCLC ; Return Carry Set
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;Else
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ISDGT: CMP #$30 ;If Char < '0'
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BCC ISRTS ; Return Carry Clear
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@ -19,29 +19,33 @@ IABS: CPY #$80 ;If Negative (High Bit Set)
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TAY ; and Copy to Y Register
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IABSX: RTS
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;imax(m,n) - Get MAXimum of Two Integers
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;Args: A,Y = Numbers to Compare
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;imax(i) - Get MAXimum of Two Integers
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;Args: Y,X = Second Integer
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;Uses: SRCHI,SRCLO = First Integer
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;Affects: N,Z,C
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;Returns: A = Larger of the Two Arguments
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;Returns: Y,X = Larger of the Two Arguments
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IMAX: CPY SRCHI ;If Y < SRCHI
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BCC IMAXC ; Return SRCLO, SRCHI
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CPX SRCLO ;IF X >= SRCLO
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BCS IMINX ; Return Argument
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IMAXC: JMP GETSRC ;Return Integer in SRCLO, SRCHI
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;imin(m,n) - Get MINimum Get MAXimum of Two Numbers
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;Args: A,Y = Numbers to Compare
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;Sets: TEMP0 = Second Argument
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;imin(i) - Get MINimum of Two Integers
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;Args: Y,X = Second Integer
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;Uses: SRCHI,SRCLO = First Integer
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;Affects: N,Z,C
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;Returns: A = Smaller of the Two Arguments
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;Returns: Y,X = Larger of the Two Arguments
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IMIN: CPY SRCHI ;If Y < SRCHI
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BCS IMINX ; Return Argument
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BCC IMINX ; Return Argument
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BNE IMAXC ;If Y > SRCHI Return SRCHI,SRCLO
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CPX SRCLO ;If X < SRCLO
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BCS IMINX ; Return Argument
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BNE IMAXC ;If X > SRCLO Return SRCHI,SRCLO
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CPX SRCLO ;If X >= SRCLO
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BCS IMAXC ; Return SRCHI,SRCLO
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IMINX: RTS ;Return Argument
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;iaddc(c,i) - Add Byte c to Integer i
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IADDC: JSR SETSRC ;Save Integer and Clear Y
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TAX ;Copy Byte to LSB and drop into IADD
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;iadd(d) - ADD Integer d to from Integer g
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;Args: Y,X = Addend
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;Requires: setsrc(g) - Augend
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@ -82,18 +86,72 @@ ISUB: JSR SAVRXY ;Store Subtrahend in TEMP1,TEMP2
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RTS ; and Return
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;imult(m) - MULTiply Two Integers
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IMULT: RTS
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;idiv(d) - MULTiply Two Numbers
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IDIV: RTS
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;Args: Y,X - Multiplier
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;Requires: DSTHI,DSTLO = Multiplicand
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;Sets: TEMP0-TEMP3 = 32 Bit Product
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;Destroys: SRCHI, SRCLO
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;Affects: A,C,Z,N
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;Returns: Y,X = 16 Bit Product
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IMULT: JSR SETSRC ;Save Multiplier
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STY TEMP2 ;Clear Upper Bits of Product
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STY TEMP3
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LDX #16 ;Rotate Through 16 Bits
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IMULTS: LSR SRCHI ;Divide Multiplier by 2
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ROR SRCLO
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BCC IMULTR ;If Shifted out Bit is 1
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LDA TEMP2 ; Add Multiplicand
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CLC ; to Upper Half of Product
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ADC DSTLO
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STA TEMP2
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LDA TEMP3
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ADC DSTHI
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IMULTR: ROR ;Rotate Partial Product
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STA TEMP3
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ROR TEMP2
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ROR TEMP1
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ROR TEMP0
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DEX ;Decrement Counter
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BNE IMULTS ;and Process Next Bit
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LDX TEMP0
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LDY TEMP1 ;Return Low 16 Bits of Product
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RTS
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;idiv(d) - DIVide Two Numbers
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;Args: Y,X - Divisor
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;Requires: DSTHI,DSTLO = Dividend
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;Sets: SRCHI,SRCLO = Divisor
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; DSTHI,DSTLO = Quotient
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; TEMP1,TEMP2 = Remainder
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;Affects: A,C,Z,N
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;Returns: Y,X = 16 Bit Quotient
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IDIV: JSR SETSRC ;Save Divisor
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STA TEMP1
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STA TEMP2
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LDX #16 ;repeat for each bit: ...
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IDIVL: ASL DSTLO ;dividend lb & hb*2, msb -> Carry
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ROL DSTHI
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ROL TEMP1 ;remainder lb & hb * 2 + msb from carry
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ROL TEMP2
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LDA TEMP1
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SEC
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SBC SRCLO ;substract divisor to see if it fits in
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TAY ;lb result -> Y, for we may need it later
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LDA TEMP2
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SBC SRCHI
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BCC IDIVS ;if carry=0 then divisor didn't fit in yet
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STA TEMP2 ;else save substraction result as new remainder,
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STY TEMP1
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INC DSTLO ;and INCrement result cause divisor fit in 1 times
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IDIVS: DEX
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BNE IDIVL
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RTS
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;ishftl(n,i) - Shift Integer i to the Left n Bits
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;Sets: TEMP1, TEMP2 = LSB, MSB of Result
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;Affects: A,Y,N,Z,C
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;Returns: Y,X = Shifted Integer
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ISHFTL: JSR SAVRXY ;Save X,Y in TEMP1,TEMP2
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TYA ;Set Counter to Number of Bits
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TAY ;Set Counter to Number of Bits
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ASL TEMP1 ;Shift LSB to Left
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ROL TEMP2 ;Rotate MSB to Left
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DEY ;Decrement Counter
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@ -105,7 +163,7 @@ ISHFTL: JSR SAVRXY ;Save X,Y in TEMP1,TEMP2
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;Affects: A,Y,N,Z,C
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;Returns: Y,X = Shifted Integer
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ISHFTR: JSR SAVRXY ;Save X,Y in TEMP1,TEMP2
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TYA ;Copy
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TAY ;Copy
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LSR TEMP1 ;Shift LSB to Right
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ROR TEMP2 ;Rotate MSB to Right
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DEY ;Decrement Counter
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@ -162,11 +220,11 @@ ITOA: JSR CVIBCD ;Convert Integer to Packed BCD
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LDY #0 ;Initialize Index into String
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STY TEMP3
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ITOAA: LDY #4 ;Set Initial Digit Number
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JSR UPBCDI ;Unpack Digit Y
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ITOAZ: BNE ITOAS ;If Zero
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DEX ; Decrement Digit Number
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ITOAZ: JSR UPBCDI ;Unpack Digit Y
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BNE ITOAS ;If Zero
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DEY ; Decrement Digit Number
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BNE ITOAZ ; If Not Zero Loop
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BEQ ITOAS ; Else Skip Unpack
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BEQ ITOAS ; Else IDIVS Unpack
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ITOAL: JSR UPBCDI ;Unpack Digit #Y
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ITOAS: TAX ;Save Digit in X
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TYA ;Push Digit Number into Stack
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@ -209,8 +267,8 @@ UPBCDS: AND #$0F ;Strip Off High Nybble
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;cvibcd(int) - ConVert Integer to packed Binary Coded Decimal
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;Args: Y,X - Integer to Convert
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;Sets: TEMP0 = Tens and Ones Digit
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; TEMP1 = Hundreds Digit
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; TEMP2 = Thousands Digit
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; TEMP1 = Thousands and Hundreds Digit
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; TEMP2 = Ten-Thousands Digit
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;Affects: A,X,Y
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CVIBCD: LDA #0 ;Clear BCD Bytes
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STA TEMP0
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@ -241,4 +299,4 @@ CVIBCL: ASL $101,X ;Shift High Bit Into Carry
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PLA ;Restore Stack
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PLA
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PLP ;Restore Status Register
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RTS
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RTS
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@ -63,6 +63,39 @@ GETSRC: LDX SRCLO
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LDY SRCHI
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RTS
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;Add TEMP1,TEMP2 to X,Y
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ADDTXY: TXA
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CLC
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ADC TEMP1
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TAX
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TYA
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ADC TEMP2
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TAY
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RTS
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;Subtract TEMP1,TEMP2 from X,Y
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SUBTXY: TXA
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SEC
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SBC TEMP1
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TAX
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TYA
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SBC TEMP2
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TAY
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RTS
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;Decrement X,Y Register Pair
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DECRXY: CPY #0
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BNE DECRXZ
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DEY
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DECRXZ: DEX
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RTS
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;Increment X,Y Register Pair
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INCRXY: INX
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BNE INCRXZ
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INY
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INCRXZ: RTS
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;Add Accumulator to Destination Address
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ADDDSA: TAX ;Move Accumulator to Argument LSB
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LDY #0 ;Clear Argument MSB
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@ -19,6 +19,9 @@ void addsrc();
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* &n - amount to add */
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void addzpw();
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/* Decrement X, and Y Registers */
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int decrxy();
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/* Get Destination Pointer *
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* Returns: Y,X=Destination address */
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int getdst();
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@ -27,6 +30,9 @@ int getdst();
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* Returns: Y,X=Source address */
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int getsrc();
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/* Increment X, and Y Registers */
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int incrxy();
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/* Restore Destination Pointer *
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* Returns: Y,X=Destination address */
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int resdst();
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@ -57,10 +63,6 @@ void savrxy();
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* Returns: Y,X=Source address */
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int savsrc();
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/* Set Buffer Pointer *
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* Args: &d - Buffer address */
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void setbfr();
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/* Set Destination Pointer to Source Pointer */
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int setdss();
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@ -30,16 +30,26 @@ GETCPR: JSR PUTS ;Print Prompt
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;void putbin(b) - PUT Binary
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;Args: A = number to print
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;Sets: TEMP0 = 0
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;Destroys: TEMP0, TEMP1
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;Affects: A,Y,C,N,X
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PUTBIN: STA TEMP0 ;Save Number
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PUTBIN: LDY #$FF ;Set Bitmask to All 1's
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;void putmsk(b) - PUT bitMaSK
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;Args: A = byte to print
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; Y = Bitmask
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;Destroys: TEMP0, TEMP1
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;Affects: A,Y,C,N,X
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PUTMSK: STA TEMP2 ;Save Byte
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STY TEMP1 ;Save Bitmask
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LDX #8 ;Print 8 Binary Digits
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PUTBIL: LDA #0
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ASL TEMP0 ;Shift Top Bit Out
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PUTMSL: LDA #0 ;Clear Accumulator
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ASL TEMP2 ;Shift Top Bit Out of Byte
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ADC #$30 ;Convert to '0' or '1'
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JSR PUTCHR ;Print Digit
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DEX ;Decrement Index
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BNE PUTBIL ;Loop if Not Done
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ASL TEMP1 ;Shift Top Bit Out of Mask
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BCC PUTMSS ;If Set
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JSR PUTCHR ; Print Digit
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PUTMSS: DEX ;Decrement Index
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BNE PUTMSL ;Loop if Not Done
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RTS
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;void putdel(b) - PUT DEcimal Left justified
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@ -90,14 +100,14 @@ PUTDE3: LDA TEMP0 ;Get Low Byte
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PUTDGT: ORA #$30 ;Convert to ASCII digit
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JMP PUTCHR ;And Print
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;puthex(&word) - PUT HEXadecimal
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;puthex(b) - PUT HEXadecimal
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PUTHEX EQU PRBYTE ;Print Byte as Hexadecimal
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;putint(&word) - PUT INTeger
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PUTINT: JSR CVIBCD ;Convert Integer to Packed BCD
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LDY #4 ;Set Initial Digit Number
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JSR UPBCDI ;Unpack Digit X
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PUTINZ: BNE PUTINS ;If Zero
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PUTINZ: JSR UPBCDI ;Unpack Digit X
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BNE PUTINS ;If Zero
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DEY ; Decrement Digit Number
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BNE PUTINZ ; If Not Zero Loop
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BEQ PUTDGT ; Else Print Digit and Return
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@ -107,23 +117,60 @@ PUTINS: JSR PUTDGT ;Print Digit
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BPL PUTINL ;Loop if >= Zero
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RTS
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;putnyb(b) - PUT NYBble
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PUTNYB EQU PRHEX ;Print Nybble as Hexadecimal
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;putsqb(&word) - PUT SesQuiByte
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;Args: Y = High Nybble
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; X = Low Byte
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;Calls: PRBYTE = Print Byte
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; PRHEZ = Print Hex Digit
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; SAVRXY = Save X and Y Registers
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;Affects: A,Y,X,N,Z,C
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PUTSQB: JSR SAVRXY ;Save Address
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PUTSQA: LDA TEMP2 ;Load Address MSB
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JSR PRHEX ;Print High Nybble
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LDA TEMP1 ;Load Address LSB
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JMP PRBYTE ;Print and Return`
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;putexh(&word) - PUT EXtended Hexadecimal
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;Args: A = Value Extended Byte
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; Y = Value High Byte
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; X = Value Low Byte
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;Calls: PRBYTE = Print Byte
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; SAVRXY = Save X and Y Registers
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; PUTWRA = Put Word (Alternate Entry Point)
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;Affects: A,Y,X,N,Z,C
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PUTEXH: JSR SAVRXY ;Save High and Low Bytes
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JSR PRBYTE ;Print Extended Byte
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JMP PUTWRA ;Print High and Low Bytes
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;putwrd(&word) - PUT WoRD
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;Args: Y = Word MSB
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; X = Word LSB
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;Calls: PUTS = Put String
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; PRBYTE = Print Byte
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;Calls: PRBYTE = Print Byte
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; SAVRXY = Save X and Y Registers
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;Affects: A,Y,X,N,Z,C
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PUTWRD: JSR SAVRXY ;Save Address
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PUTWRA: LDA TEMP2 ;Load Address MSB
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PUTWRD: JSR SAVRXY ;Save Word
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PUTWRA: LDA TEMP2 ;Load Word MSB
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JSR PRBYTE ;Print as Hexadecimal
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LDA TEMP1 ;Load Address LSB
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LDA TEMP1 ;Load Word LSB
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JMP PRBYTE ;Print and Return`
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;Print a Space
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PUTSPC: LDA #32 ;Load Space Character
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JMP PUTCHR ;and Print it
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;Print Repeated Spaces
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PUTRPS: TAY ;Set Counter to Number of Spaces
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LDA #32
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;Print Repeated Character
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PUTRPT: JSR PUTCHR ;Print Space Character
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DEY ;Decrement Counter
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BNE PUTRPT ;If Not 0, Loop
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RTS
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;void printf(b, &s) - PRINT Formatted byte and/or string
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;Args: A = byte to format
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; Y,X = address of formatting string
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@ -132,8 +179,8 @@ PUTSPC: LDA #32 ;Load Space Character
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; TEMP3 - number to format
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;Destroys: TEMP0,TEMP1,TEMP2
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;Returns: A,Y = Total number of characters printed
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PRINTF: JSR SETSRC ;Initialize Source String
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STA TEMP3 ;Save Byte to Format
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PRINTF: STA TEMP3 ;Save Byte to Format
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JSR SETSRC ;Initialize Source String
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PRINTL: LDA (SRCLO),Y ;Read next character in string
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BEQ PRINTX ;If Not 0
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CMP #'% ;' If Format Specified
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@ -160,10 +207,15 @@ PRINTR: CMP #'R ;'If "r" or "R"
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JSR PUTDES ; Print Right Justified
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JMP PRINTY ; and Continue Printing String
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PRINTD: CMP #'D ;'Else If "d" or "D"
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BNE PRINTH
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BNE PRINTG
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LDA TEMP3 ; Load Byte to Format
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JSR PUTDEC ; Print as Decimal
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JMP PRINTY ; and Continue Printing String
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PRINTG: CMP #'G ;'Else If "g" or "G"
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BNE PRINTH
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LDA TEMP3 ; Load Byte to Format
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JSR PUTNYB ; Print as Low Nybble as Hexadecimal
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JMP PRINTY ; and Continue Printing String
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PRINTH: CMP #'H ;'Else If "h" or "H"
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BNE PRINTB
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LDA TEMP3 ; Load Byte to Format
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@ -171,8 +223,10 @@ PRINTH: CMP #'H ;'Else If "h" or "H"
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JMP PRINTY ; and Continue Printing String
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PRINTB: CMP #'B ;'Else If "b" or "B"
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BNE PRINTN
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STY TEMP0 ; Save Index
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LDA TEMP3 ; Load Byte to Format
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JSR PUTBIN ; Print as Binary
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LDY TEMP0 ; Restore Index
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JMP PRINTY ; and Continue Printing String
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PRINTN: CMP #'N ;'Else If "n" or "N"
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BNE PRINTS
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@ -181,11 +235,18 @@ PRINTN: CMP #'N ;'Else If "n" or "N"
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LDY TEMP0 ; Restore Index
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JMP PRINTY ; and Continue Printing String
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PRINTS: CMP #'S ;'Else If "s" or "S"
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BNE PRINTW
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BNE PRINTQ
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STY TEMP0 ; Save Index
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JSR PUTDST ; Print Destination String
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LDY TEMP0 ; Restore Index
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JMP PRINTY ;
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PRINTQ: CMP #'Q ;'Else If "w" or "W"
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BNE PRINTW
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STY TEMP0 ; Save Index
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JSR SAVDST ; Save Destination Address
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JSR PUTSQA ; Print MSB and LSB as Hex
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LDY TEMP0 ; Restore Index
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JMP PRINTY ;
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PRINTW: CMP #'W ;'Else If "w" or "W"
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BNE PRINTI
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STY TEMP0 ; Save Index
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@ -36,24 +36,35 @@ void putder();
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/* Print Destination String */
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void putdst();
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/* Print Extended Hexadecimal Number *
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* Args: char n - High Byte *
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||||
* int w - Middle and Low Bytes */
|
||||
void putexh();
|
||||
|
||||
/* Print Byte as Hexadecimal Number *
|
||||
* Args: b - Number to print */
|
||||
void puthex();
|
||||
|
||||
/* Print Word as Decimal Number *
|
||||
* Args: int w - Number to print */
|
||||
void putint();
|
||||
|
||||
void putwrd();
|
||||
/* Print Byte as Masked Bits *
|
||||
* Args: b - Byte to print *
|
||||
* m - Bitmask */
|
||||
void putmsk();
|
||||
|
||||
/* Print Nybble as Hexadecimal Number *
|
||||
* Args: b - Number to print */
|
||||
void putnyb();
|
||||
|
||||
/* Print a Space Character */
|
||||
void putspc();
|
||||
|
||||
/* Print /* Print Byte as Hexadecimal Number *
|
||||
* Args: b - Number to print */
|
||||
void puthex();
|
||||
|
||||
/* Print Byte as Hexadecimal Number *
|
||||
* Args: b - Number to print */
|
||||
void puthex();
|
||||
|
||||
/* Print Byte as Hexadecimal Number *
|
||||
* Args: b - Number to print */
|
||||
void puthex();
|
||||
/* Print Word as Three Hex Digits *
|
||||
* Args: int w - Number to print */
|
||||
void putsqb();
|
||||
|
||||
/* Print Word as Hexadecimal Number *
|
||||
* Args: int w - Number to print */
|
||||
|
|
|
|||
|
|
@ -4,6 +4,18 @@
|
|||
; external zero page byte pairs SRCLO,SRCHI and DSTLO,DSTHI
|
||||
; and external bytes TEMP0 and TEMP1
|
||||
|
||||
;Affects N,Z
|
||||
;Returns A,Y = New String Length
|
||||
STRAPD: STA TEMP0 ;Save Character to Append
|
||||
JSR STRLEN ;Get Length of String
|
||||
BMI STRCLX ;Return 255 if > 127
|
||||
LDA TEMP0 ;Restore Character to Append
|
||||
STRAPL: STA (SRCLO),Y ;Store at End of String
|
||||
BEQ STRLEX ;Exit if NUL
|
||||
INY ;Increment Past New Character
|
||||
LDA #0 ;Set Character to NUL
|
||||
BEQ STRAPL ;and Append to String
|
||||
|
||||
;strcmp(&s) - Compare String (to Destination String)
|
||||
;Requires: DSTLO, DSTHI - Pointer to destination string
|
||||
;Args: X,Y = Pointer to source string
|
||||
|
|
@ -46,6 +58,10 @@ STRCLC: CLC ;Clear Carry
|
|||
STRCLX: LDA #$FF ;Load -1 into Accumulater
|
||||
RTS ;and Return
|
||||
|
||||
;strapd(c, &s) - Append Character to String
|
||||
;Args: A = Character to Append
|
||||
; X,Y = Pointer to String
|
||||
;Sets: SRCLO, SRCHI - Pointer to String
|
||||
;strlen(&s) - Return Length of String
|
||||
;Args: X,Y - Pointer to string
|
||||
;Sets: SRCLO,SRCHI = Pointer to source string
|
||||
|
|
@ -95,6 +111,8 @@ STRCAX: STY TEMP3 ;Subtract Destination String Length
|
|||
;Sets: SRCLO,SRCHI = Pointer to source string
|
||||
;Affects: N,Z
|
||||
;Returns: A,Y = Number of characters copied
|
||||
STRCPA: LDY #0 ;Alternate entry point
|
||||
BEQ STRCPL ;for when Source already set
|
||||
STRCPY: JSR SETSRC ;Initialize Source String
|
||||
STRCPL: LDA (SRCLO),Y ;Get Character from Source String
|
||||
STA (DSTLO),Y ;Copy to Destination String
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
; C02 library util.h02 assembly language subroutines
|
||||
; Requires external function SETSRC, STRLEN, STRCML, and STRCPL
|
||||
; Requires external function SETSRC, STRLEL, STRCML, and STRCPL
|
||||
; and external zero page locations DSTLO, DSTHI, SRCLO, and SRCHI
|
||||
|
||||
;tkndec(&list) - Decode Token into Destination String
|
||||
|
|
@ -22,7 +22,7 @@ TKNDEL: JSR STRLEL ;Get Length of first Token in List
|
|||
INY ;plus 1
|
||||
TXA ;Compare Argument
|
||||
CMP (SRCLO),Y ;to Tokenized Value
|
||||
BEQ TKNDET ;If Not Egual
|
||||
BEQ TKNDET ;If Not Equal
|
||||
TYA ; Get Token Length
|
||||
JSR TKNNXT ; Skip to Next Token
|
||||
BEQ TKNDEL ; and Loop
|
||||
|
|
|
|||
|
|
@ -2,12 +2,12 @@
|
|||
* util - C02 Utility Functions *
|
||||
********************************/
|
||||
|
||||
/* Decode Tokeniz into Destination String *
|
||||
/* Decode Token into Destination String *
|
||||
* Args: &t - Address of Token List *
|
||||
* Returns: Tokenized Value of String */
|
||||
char tkndec();
|
||||
|
||||
/* Encode Tokenized from Destination String *
|
||||
/* Encode Token from Destination String *
|
||||
* Args: &t - Address of Token List *
|
||||
* Returns: Tokenized Value of String */
|
||||
char tknenc();
|
||||
|
|
|
|||
Loading…
Reference in New Issue