mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-22 01:31:33 +00:00
115 lines
3.9 KiB
NASM
115 lines
3.9 KiB
NASM
;ctype.h02 assembly language subroutines
|
|
;
|
|
;C02 Functions modify Accumulator and Flags
|
|
; isxxxx will load $FF into Accumulator to and Set Carry if True
|
|
; and load $00 into Accumulator to and clear Carry if False
|
|
; toxxxx set Carry if character is converted, otherwise clear Carry
|
|
;Machine Language Subroutines modify Flags but not Accumulator
|
|
; Carry will be Set if True and Cleared if False
|
|
;Index Registers are not modified by any routines
|
|
|
|
;Character Test Functions - Set Accumulator
|
|
isalnm: JSR isaln ;Is Alphanumeric Character
|
|
BVC isbtf
|
|
isalph: JSR isalp; ;Is Alphabetic Character
|
|
BVC isbtf
|
|
isctrl: JSR isctl ;Is Control Character
|
|
BVC isbtf
|
|
isdigt: JSR isdgt ;Is Digit
|
|
BVC isbtf
|
|
isgrph: JSR isgrp ;Is Graphical Character
|
|
BVC isbtf
|
|
ishdgt: JSR ishex ;Is Hex Digit
|
|
BVC isbtf
|
|
islowr: JSR islwr ;Is Lowercase Character
|
|
BVC isbtf
|
|
ispnct: JSR ispnc ;Is Punctuation Character
|
|
BVC isbtf
|
|
isprnt: JSR isprt ;Is Printable Character
|
|
BVC isbtf
|
|
isspce: JSR isspc ;Is White Space Character
|
|
BVC isbtf
|
|
isuppr: JSR isupr ;Is Uppercase Character
|
|
BVC isbtf
|
|
|
|
;Internal Routines - Set Accumulator based on Carry Flag
|
|
isbtf: BCC isfls ;If Carry Set
|
|
istru: LDA #$FF ; Return TRUE
|
|
RTS ;Else
|
|
isfls: LDA #$00 ; Return FALSE
|
|
RTS
|
|
|
|
;C02/ML Character Conversion Routines
|
|
tolowr: JSR isupr ;If Char is Not Upper Case
|
|
BCC isrts ; Return
|
|
ORA #$20 ;Else Set Bit 5
|
|
RTS ; and Return
|
|
|
|
touppr: JSR islwr ;If Char is Not Lower Case
|
|
BCC isrts ; Return
|
|
AND #$DF ;Else Clear Bit 5
|
|
RTS ; and Return
|
|
|
|
;Machine Language Subroutines - Set/Clear Carry, Preserve Accumulator
|
|
isaln: JSR isdgt ;If Char is Digit
|
|
BCS isrts ; Return Carry Set
|
|
;Else
|
|
isalp: JSR isupr ;If Char is Upper Case
|
|
BCS isrts ; Return Carry Set
|
|
;Else
|
|
islwr: CMP #$61 ;If Char < 'a'
|
|
BCC isrts ; Return with Carry Clear
|
|
CMP #$7B ;Else If Char >= '{'
|
|
JMP isbcs ; Return with Carry Clear Else Return with Carry Set
|
|
|
|
isupr: CMP #$41 ;If Char < 'A'
|
|
BCC isrts ; Return with Carry Clear
|
|
CMP #$5B ;Else If Char >= '['
|
|
isbcs: BCS isclc ; Return with Carry Clear
|
|
BCC issec ;Else Return with Carry Set
|
|
|
|
issec: SEC ;Set Carry
|
|
BCS isrts ; and Return
|
|
|
|
isclc: CLC ;Clear Carry
|
|
isrts: CLV ;Clear Overflow - for C02 calls
|
|
RTS ;Return from Subroutine
|
|
|
|
isctl: CMP #$7F ;If Char = DEL
|
|
BEQ issec ; Return Carry Set
|
|
CMP #$20 ;Else If Char < ' '
|
|
JMP isbcs ; Return Carry Set Else Return Carry Clear
|
|
|
|
isdgt: CMP #$30 ;If Char < '0'
|
|
BCC isrts ; Return Carry Clear
|
|
CMP #$3A ;Else If Char >= ':'
|
|
JMP isbcs ; Return FALSE Else Return TRUE
|
|
|
|
ispnc: JSR isaln ;If Char is Alphanumeric
|
|
BCS isclc ; Return Carry Clear
|
|
;Else
|
|
isgrp: CMP #$20 ;If Char is Space
|
|
BEQ isclc ; Return Carry Clear
|
|
;Else
|
|
isprt: CMP #$80 ;If Char is High ASCII
|
|
BCS isclc ; Return Carry Clear
|
|
JSR isctl ;If Char is Not Control
|
|
JMP isbcs ; Return Carry Clear Else Return Carry Set
|
|
|
|
isspc: CMP #$20 ;If Char is ' '
|
|
BEQ issec ; Return Carry Set
|
|
CMP #$09 ;If Char < '\t'
|
|
BCC isrts ; Return Carry Clear
|
|
CMP #$0E ;Else If Char > '\r'
|
|
JMP isbcs ; Return Carry Clear Else Return Carry Set
|
|
|
|
ishex: CMP #$41 ;If Char < 'A'
|
|
BCC isdgt ; Check for Digit
|
|
CMP #$47 ;Else If Char < 'G'
|
|
BCC issec ; Return Carry Set
|
|
CMP #$61 ;Else If Char < 'a'
|
|
BCC isrts ; Return Carry Clear
|
|
CMP #$67 ;Else If Char >= 'g'
|
|
JMP isbcs ; Return Carry Clear Else Return Carry Set
|
|
|