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