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147 lines
4.5 KiB
Plaintext
147 lines
4.5 KiB
Plaintext
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PROCESSOR 6502
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ORG $0200
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; ctype.h02 assembly language subroutines
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;
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isalnm: LDX #0 ;ALNUM
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BPL ctype
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isalph: LDX #1 ;ALPHA
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BPL ctype
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isctrl: LDX #2 ;CNTRL
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BPL ctype
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isdigt: LDX #3 ;DIGIT
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BPL ctype
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isgrph: LDX #4 ;GRAPH
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BPL ctype
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islowr: LDX #5 ;LOWER
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BPL ctype
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isprnt: LDX #6 ;PRINT
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BPL ctype
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ispnct: LDX #7 ;PUNCT
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BPL ctype
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isspce: LDX #8 ;SPACE
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BPL ctype
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isuppr: LDX #9 ;UPPER
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BPL ctype
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isxdgt: LDX #10 ;HXDGT
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ctype: TAY ;Save Character
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AND #$80 ;If High Bit Set
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BNE cflse ; Return False
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LDA cchar,Y ;Get Character Bit Mask
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AND cmask,X ;If it Matches Test Bit Mask
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BNE ctrue ; Return True
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cflse: LDA #0 ;Return False
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RTS
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ctrue: LDA #$FF ;Return True
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RTS
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;Informational Only
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;CNTRL EQU %00000001 ;Control Character
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;SPACE EQU %00000010 ;White Space
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;BLANK EQU %00000100 ;Blank
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;PUNCT EQU %00001000 ;Punctuation
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;DIGIT EQU %00010000 ;Decimal Digit
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;HEXDC EQU %00100000 ;Hexadecimal Digit
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;UPPER EQU %01000000 ;Upper Case
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;LOWER EQU %10000000 ;Lower Case
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;Character Test Bit Masks
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cmask: DB %11010000 ;ALNUM = DIGIT + UPPER + LOWER
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DB %11000000 ;ALPHA = UPPER + LOWER
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DB %00000001 ;CNRTL
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DB %00010000 ;DIGIT
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DB %11011000 ;GRAPH = PUNCT + DIGIT + UPPER + LOWER
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DB %10000000 ;LOWER
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DB %11011100 ;PRINT = BLANK + PUNCT + DIGIT + UPPER + LOWER
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DB %00001000 ;PUNCT
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DB %00000010 ;SPACE
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DB %01000000 ;UPPER
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DB %00110000 ;HXDGT = DIGIT + HEXDC
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;Character Set Bit Masks
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cchar: DB %00000001 ;00 NUL CNTRL
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DB %00000001 ;01 SOH CNTRL
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DB %00000001 ;02 STX CNTRL
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DB %00000001 ;03 ETX CNTRL
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DB %00000001 ;04 EOT CNTRL
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DB %00000001 ;05 ENQ CNTRL
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DB %00000001 ;06 ACK CNTRL
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DB %00000001 ;07 BEL CNTRL
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DB %00000001 ;08 BS CNTRL
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DB %00000011 ;09 HT CNRTL + SPACE
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DB %00000011 ;0A LF CNRTL + SPACE
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DB %00000011 ;0B VT CNRTL + SPACE
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DB %00000011 ;0C FF CNRTL + SPACE
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DB %00000011 ;0D CR CNRTL + SPACE
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DB %00000001 ;0E SS CNRTL
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DB %00000001 ;0F SI CNRTL
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DB %00000001 ;10 DLE CNRTL
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DB %00000001 ;11 DC1 CNRTL
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DB %00000001 ;12 DC2 CNRTL
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DB %00000001 ;13 DC3 CNRTL
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DB %00000001 ;14 DC4 CNRTL
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DB %00000001 ;15 NAK CNRTL
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DB %00000001 ;16 SYN CNRTL
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DB %00000001 ;17 ETB CNRTL
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DB %00000001 ;18 CAN CNRTL
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DB %00000001 ;19 EM CNRTL
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DB %00000001 ;1A SUB CNRTL
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DB %00000001 ;1B ESC CNRTL
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DB %00000001 ;1C FS CNRTL
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DB %00000001 ;1D GS CNRTL
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DB %00000001 ;1E RS CNRTL
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DB %00000001 ;1F US CNRTL
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DB %00000110 ;20 SPC SPACE + BLANK
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DB %00001000 ;21 ! PUNCT
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DB %00001000 ;22 " PUNCT
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DB %00001000 ;23 # PUNCT
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DB %00001000 ;24 $ PUNCT
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DB %00001000 ;25 % PUNCT
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DB %00001000 ;26 & PUNCT
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DB %00001000 ;27 ' PUNCT
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DB %00001000 ;28 ( PUNCT
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DB %00001000 ;29 ) PUNCT
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DB %00001000 ;2A * PUNCT
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DB %00001000 ;2B + PUNCT
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DB %00001000 ;2C , PUNCT
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DB %00001000 ;2D - PUNCT
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DB %00001000 ;2E . PUNCT
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DB %00001000 ;2F / PUNCT
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DB %00110000 ;30 0 DIGIT + HEX
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DB %00110000 ;31 1 DIGIT + HEX
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DB %00110000 ;32 2 DIGIT + HEX
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DB %00110000 ;33 3 DIGIT + HEX
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DB %00110000 ;34 4 DIGIT + HEX
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DB %00110000 ;35 5 DIGIT + HEX
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DB %00110000 ;36 6 DIGIT + HEX
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DB %00110000 ;37 7 DIGIT + HEX
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DB %00110000 ;38 8 DIGIT + HEX
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DB %00110000 ;39 9 DIGIT + HEX
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DB %00001000 ;3A : PUNCT
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DB %00001000 ;3B ; PUNCT
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DB %00001000 ;3C < PUNCT
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DB %00001000 ;3D = PUNCT
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DB %00001000 ;3E > PUNCT
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DB %00001000 ;3F ? PUNCT
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;char tolwr(char c) - Convert to Lower Case
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; sets Carry if if Converted
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tolwr: JSR isupc ;If Char is Not Upper Case
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BCC isrts ; Return
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ORA $20 ;Else Set Bit 6
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RTS ; and Return
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;char toupr(char c) - Convert to Upper Case
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; sets Carry if if Converted
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toupr: JSR islwr ;If Char is Not Lower Case
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BCC isrts ; Return
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AND $DF ;Else Clear Bit 6
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RTS ; and Return
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