mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-25 21:33:44 +00:00
105 lines
3.5 KiB
Plaintext
105 lines
3.5 KiB
Plaintext
PROCESSOR 6502
|
|
ORG $0200
|
|
; ctype.h02 assembly language subroutines
|
|
;
|
|
; All calls replace Accumulator and set Flags
|
|
; Index Registers are not Modified
|
|
; isxxxx will load $FF into Accumulator to and Set Carry if True
|
|
; and load $00 into Accumulator to and clear Carry if False
|
|
; toxxxx set Carry if character is converted, otherwise clear Carry
|
|
|
|
;Character Test Routines
|
|
isalnm: JSR isdigt ;If Char is Digit
|
|
BCS isrts ; Return TRUE
|
|
;Else
|
|
isalph: JSR isuppr ;If Char is Upper Case
|
|
BCS isrts ; Return TRUE
|
|
;Else
|
|
islowr: JSR islwc ;If Char is Lower Case
|
|
BVC isbft ; Return FALSE Else Return TRUE
|
|
; BCS isfls ; Return FALSE
|
|
; BCC istru ;Else Return TRUE
|
|
|
|
isuppr: JSR isupc ;If Char is Uppercase
|
|
BVC isbft ; Return FALSE Else Return TRUE
|
|
; BCS isfls ; Return FALSE
|
|
; BCC istru ;Else Return TRUE
|
|
|
|
isctrl: CLV ;Clear Overflow
|
|
CMP #$7F ;If Char = DEL
|
|
BEQ istru ; Return TRUE
|
|
CMP #$20 ;Else If Char < ' '
|
|
BVC isbft ; Return TRUE Else Return FALSE
|
|
; BCC istru ; Return TRUE
|
|
; BCS isfls ;Else Return FALSE
|
|
|
|
isdigt: CLV ;Clear Overflow
|
|
CMP #$30 ;If Char < '0'
|
|
BCC isfls ; Return FALSE
|
|
CMP #$3A ;Else If Char >= ':'
|
|
BVC isbft ; Return FALSE Else Return TRUE
|
|
; BCS isfls ; Return FALSE
|
|
; BCC istru ;Else Return True
|
|
|
|
ispnct: JSR isalnm ;If Char is Alphanumeric
|
|
BNE isfls ; Return FALSE
|
|
;Else
|
|
isgrph: CMP #$20 ;If Char is Space
|
|
BEQ isfls ; Return FALSE
|
|
;Else
|
|
isprnt: JSR isctrl ;If Char is Not Control
|
|
BVC isbft ; Return TRUE Else Return FALSE
|
|
; BCC istru ; Return TRUE
|
|
; BCS isfls ;Else Return FALSE
|
|
|
|
isspc: CLV ;Clear Overflow
|
|
CMP #$20 ;If Char is ' '
|
|
BEQ istru ; Return TRUE
|
|
CMP #$09 ;If Char < '\t'
|
|
BCC isfls ; Return TRUE
|
|
CMP #$0E ;Else If Char > '\r'
|
|
BVC isbft ; Return FALSE Else Return TRUE
|
|
; BCS isfls ; Return FALSE
|
|
; BCC istru ;Else Return TRUE
|
|
|
|
isxdgt: JSR touppr ;Convert to Uppercase
|
|
CMP #$41 ;If Char < 'A'
|
|
BCC isdigt ; Check for Digit
|
|
CMP #$5B ;Else If Char >= 'G'
|
|
isbft: BCS isfls ; Return FALSE
|
|
;Else
|
|
istru: LDA #$FF ;Return TRUE
|
|
issec: SEC ;Set Carry
|
|
RTS ;and Return
|
|
|
|
isfls: LDA #$00 ;Return FALSE
|
|
isclc: CLC ;Clear Carry
|
|
isrts: RTS ;Return from Subroutine
|
|
|
|
;Internal Test Routines - Do Not Change Accumulator
|
|
islwc: CLV ;Clear Overflow for Calling Routine
|
|
CMP #$61 ;If Char < 'a'
|
|
BCC isrts ; Return with Carry Clear
|
|
CMP #$7B ;Else If Char >= '{'
|
|
BCS isclc ; Return with Carry Clear
|
|
BCC issec ;Else Return with Carry Set
|
|
|
|
isupc: CLV ;Clear Overflow for Calling Routine
|
|
CMP #$41 ;If Char < 'A'
|
|
BCC isrts ; Return with Carry Clear
|
|
CMP #$5B ;Else If Char >= '['
|
|
BCS isclc ; Return with Carry Clear
|
|
BCC issec ;Else Return with Carry Set
|
|
|
|
;Character Conversion Routines
|
|
tolowr: JSR isupc ;If Char is Not Upper Case
|
|
BCC isrts ; Return
|
|
ORA $20 ;Else Set Bit 6
|
|
RTS ; and Return
|
|
|
|
touppr: JSR islwc ;If Char is Not Lower Case
|
|
BCC isrts ; Return
|
|
AND $DF ;Else Clear Bit 6
|
|
RTS ; and Return
|
|
|