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apple2_printm/printm.s
Michaelangel007 0aadae75e0 Ver 42 - fix typos in output description
2016-02-23 18:11:19 -07:00

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; ca65
.feature c_comments
.linecont +
.feature labels_without_colons
.feature leading_dot_in_identifiers
.PC02 ; 65C02
/* Version 42
printm - a modular micro printf replacement for 65C02
Michael Pohoreski
Copyleft {c} Feb, 2016
Special Thanks: Sheldon for his 65C02 printf() source, qkumba optimizations
Problem:
Ideally we want to print an 1:1 mapping of input:output text that includes
literal and variables. We could do this by using mixed ASCII case:
- high bit characters would be output "as is"
- ASCII characters would be interpreted as a variable output.
__ ___ ____ __ ________ ________
.byte "X=## Y=### $=$$$$:@@ %%%%%%%%~????????"
Legend:
# Print Dec Num
$ Print Hex Num
% Print Bin Num
? Print Bin Num but with 1's in inverse
@ Print Ptr Val
_ Chars with underscore represents ASCII characters
While originally this gives us a nice 1:1 mapping for input:output ...
... it has 2 problems:
a) it has to be constructed in pieces
b) and it is bloated.
Can we fix (a) ?
Can we use a more compact printf-style format string
where we don't waste storing the escape character AND
toggle the high bit on characters on/off as needed?
Yes, if we use a macro!
PRINTM "X=%# Y=%d $=%x:%@ %%~%?"
Can we fix (b) ?
Yes, by using an unique meta character that has the width associated with it.
This is why the cannonical printf() on the 6502 sucks:
- is bloated by using a meta-character '%' instead of the high bit
- doesn't provide a standard way to print binary *facepalm*
- doesn't provide a standard way to print a dereferenced pointer
- 2 digit, 3 digit and 5 digit decimals requiring wasting "width" characters
e.g. %2d, %3d, %5d
When a single character would work instead.
- printf() is notorious for being bloated. If you don't use
features you can't turn them off to reclaim the memory used
by the code (or data)
Solution:
Here is a *modular* _micro_ replacement: printm()
* Literals have the high byte set (APPLE text)
* Meta characters have the high bit cleared (ASCII)
$ Hex - print 1 Byte (2 characters)
x Hex - print 2 Bytes (4 characters)
@ Ptr - print hex 1 Byte at 16-bit pointer
& Ptr - print hex 2 Bytes at 16-bit pointer
# Dec - Print 1 Byte in decimal (max 2 digits)
d Dec - Print 1 Byte in decimal (max 3 digits)
u Dec - Print 2 Bytes in decimal (max 5 digits)
b Dec - Print signed 1 Byte in decimal
% Bin - Print 8 bits
? Bin - Print 8 bits but 1's in inverse
o Oct - Print 1 Byte in octal (max 3 digits)
O Oct - Print 2 Byte in octal (max 6 digits)
a Str - APPLE text (high bit set), last char is ASCII
s Str - C string, zero terminated
p Str - Pascal string, first byte is string length
Each option can individually be enabled / disabled
to control the memory footprint since you probably
don't need "every" feature. Seriously, when was the last time
you _needed_ octal? :-)
printm() has manually been optimized for size. In gcc parlance, `-Os`.
With everything enabled printm() takes up $1B4 = 436 bytes
(Plus 2 bytes in zero page.)
Whoa! I thought you said this was micro!?
Believe me it is. Here are some of the optimization tricks used:
1) Using BIT to skip instructions in common entry point
EntryPointA SEC
db BIT_ZP ; skip over next instruction
EntryPointB
CLC
...common set up code...
BCC _CodeForA
_CodeForB
_CodeForA
_CodeForAll
2) Self-modifying code for dynamic width
EntryPointA LDA n1
db BIT_ABS ; skip next instruction
EntryPointB LDA n2 ; intentional fall into common code
_SetWidth STA _DynamicWidth+1
LDX #0
...code...
_DynamicWidth
CPX #n
3) No CMPs to preserve the Carry flag for common entry points
4) Jump table is 3 bytes/entry, using 65C02: JUMP (FUNCS+1,X)
char, word_ptr_to_func
5) A negative buffer offset so that a register will reach zero
and we can test for end of processing without using a CMP
which would trash the carry:
LDY #$FD ; $00-$FD=-3 bcd[0] bcd[1] bcd[2] bcd[3]
@DoubleDabble: ; Y=FD Y=FE Y=FF Y=00
LDA _bcd-$FD,Y
ADC _bcd-$FD,Y
STA _bcd-$FD,Y
INY
BNE @DoubleDabble
; When Y=0, we'll be at _bcd[3]
With all 15 features turned OFF the core routines use $49 = 73 bytes.
With the common setting (default) features:
BinAsc, Dec2, Dec3, Dec5, Hex2, Hex4, and StrA
the size is $117 = 279 bytes
To toggle features on / off change USE_* to 0 or 1:
*/
; NOTE: The Size *also* includes the core routines
; so the actual implementation size for each feature
; is actually smaller the size leads you to believe.
; Also, "common functionality" is also included in the count..
; core _PrintDec routine.
;
; Feature Size Bytes Total Notes
USE_BIN_ASC = 1 ; $78 120 \. $7E (126 bytes)
USE_BIN_INV = 0 ; $78 119 /
USE_DEC_2 = 1 ; $C5 197 \
USE_DEC_3 = 1 ; $C5 197 \.$EF (239 bytes)
USE_DEC_5 = 1 ; $C5 197 /
USE_DEC_BYTE = 0 ; $DE 222 / sets ENABLE_DEC
USE_HEX_2 = 1 ; $93 147 \. $96 (150 bytes)
USE_HEX_4 = 1 ; $92 146 /
USE_OCT_3 = 0 ; $8C 140 \. $92 (146 bytes)
USE_OCT_6 = 0 ; $8C 140 /
USE_PTR_2 = 0 ; $A2 162 \. $A5 (165 bytes) sets ENABLE_HEX
USE_PTR_4 = 0 ; $A1 161 /
USE_STR_A = 1 ; $71 113 \
USE_STR_C = 0 ; $71 113 > $9E (158 bytes)
USE_STR_PASCAL = 0 ; $74 116 /
/*
Demo (All features) + Library text dump:
4000:20 58 FC A9 20 85 E6 A9
4008:D5 8D 00 20 A9 AA 8D 01
4010:20 AD D4 41 A2 00 A0 00
4018:20 11 F4 18 A5 26 6D D2
4020:41 85 26 AA A4 27 8E D6
4028:41 8C D7 41 8E D8 41 8C
4030:D9 41 AD 00 20 A0 00 91
4038:26 8D DA 41 9C DB 41 8D
4040:F6 41 8D FA 41 20 9F 41
4048:8D DC 41 9C DD 41 A0 00
4050:20 AF 41 A2 D0 A0 41 20
4058:0E 43 A0 01 20 AF 41 A2
4060:F4 A0 41 20 0E 43 A0 02
4068:20 AF 41 A2 F8 A0 41 20
4070:0E 43 A0 03 20 AF 41 A2
4078:23 A0 42 20 0E 43 A0 04
4080:20 AF 41 A2 27 A0 42 20
4088:0E 43 A0 05 20 AF 41 A2
4090:2B A0 42 20 0E 43 A0 06
4098:20 AF 41 A2 2F A0 42 20
40A0:0E 43 A0 07 20 AF 41 A2
40A8:5F A0 42 20 0E 43 A0 08
40B0:20 AF 41 A2 63 A0 42 20
40B8:0E 43 A0 09 20 AF 41 A2
40C0:67 A0 42 20 0E 43 A0 0A
40C8:20 AF 41 A2 6D A0 42 20
40D0:0E 43 A0 0B 20 AF 41 A2
40D8:83 A0 42 20 0E 43 A0 0C
40E0:20 AF 41 A2 87 A0 42 20
40E8:0E 43 A0 0D 20 AF 41 A2
40F0:D7 A0 42 20 0E 43 A0 0E
40F8:20 AF 41 A2 D1 A0 42 20
4100:0E 43 A0 0F 20 AF 41 A2
4108:DB A0 42 20 0E 43 A9 11
4110:20 5B FB A2 DF A0 42 20
4118:8E 41 AD 0D 43 85 FF 20
4120:DA FD AD 0C 43 85 FE 20
4128:DA FD 20 AA 41 20 4C 41
4130:A2 F1 A0 42 20 8E 41 A2
4138:0F 86 FE 64 FF 8A 20 DA
4140:FD 20 AA 41 20 4C 41 A9
4148:8D 4C ED FD 9C 8D 44 9C
4150:8E 44 9C 8F 44 A2 10 F8
4158:06 FE 26 FF A0 FD B9 90
4160:43 79 90 43 99 90 43 C8
4168:D0 F4 CA D0 EB D8 A2 05
4170:88 B9 90 43 4A 4A 4A 4A
4178:18 69 B0 20 ED FD CA B9
4180:90 43 29 0F 18 69 B0 20
4188:ED FD CA 10 E3 60 86 FC
4190:84 FD A0 00 B1 FC F0 06
4198:20 ED FD C8 D0 F6 60 A2
41A0:08 85 FE 06 FE 6A CA D0
41A8:FA 60 A9 A0 4C ED FD 98
41B0:20 C1 FB A6 28 A4 29 8E
41B8:87 44 8C 88 44 60 D8 BD
41C0:23 A0 D9 BD 64 A0 A4 BD
41C8:78 BA 40 A0 25 FE 3F 00
41D0:BE 41 27 00 BF 00 DE C0
41D8:DE C0 1A DA 1A DA C2 E9
41E0:EE A0 C1 D3 C3 BA A0 25
41E8:00 C2 E9 EE A0 C9 CE D6
41F0:BA A0 3F 00 DE 41 1A DA
41F8:E9 41 1A DA C4 E5 E3 B2
4200:BA A0 23 00 C4 E5 E3 B3
4208:BA A0 64 00 C4 E5 E3 B5
4210:BA A0 75 00 C2 F9 F4 E5
4218:BD 62 A0 62 A0 62 A0 62
4220:A0 62 00 FC 41 63 00 04
4228:42 E7 03 0C 42 69 FF 14
4230:42 80 00 FF 00 00 00 01
4238:00 7F 00 C8 E5 F8 B2 BA
4240:A0 24 00 C8 E5 F8 B4 BA
4248:A0 78 00 D0 F4 F2 B2 BA
4250:A0 78 BA 40 00 D0 F4 F2
4258:B4 BA A0 78 BA 26 00 3B
4260:42 34 12 43 42 34 12 4B
4268:42 00 20 00 20 55 42 00
4270:20 00 20 CF E3 F4 B3 BA
4278:A0 6F 00 CF E3 F4 B6 BA
4280:A0 4F 00 73 42 B6 01 7B
4288:42 DF 32 C8 C5 CC CC CF
4290:00 D7 CF D2 CC C4 00 C8
4298:CF CD 45 0D D0 E1 F3 E3
42A0:E1 EC A0 CC E5 EE A0 B1
42A8:B3 C3 A0 A0 A0 A0 A0 BA
42B0:A0 A7 73 A7 AC A7 73 A7
42B8:00 C1 F0 F0 EC E5 A0 BA
42C0:A0 A7 61 A7 00 D0 E1 F3
42C8:E3 E1 EC BA A0 A7 70 A7
42D0:00 A9 42 8B 42 91 42 B9
42D8:42 97 42 C5 42 9B 42 F0
42E0:F2 E9 EE F4 ED A8 A9 AE
42E8:F3 E9 FA E5 A0 BD A0 A4
42F0:00 A0 E2 F9 F4 E5 F3 8D
42F8:A0 A0 A0 A0 AE E6 E5 E1
4300:F4 F5 F2 E5 F3 A0 BD A0
4308:A4 A0 A0 00 B4 01 8E 24
4310:43 8C 25 43 20 1F 43 8E
4318:73 43 8C 74 43 80 53 20
4320:23 43 AA AD DE C0 EE 24
4328:43 D0 03 EE 25 43 A8 86
4330:FE 84 FF 60 18 20 1F 43
4338:90 03 20 61 44 8A 20 61
4340:44 80 27 18 20 1F 43 A0
4348:00 B1 FE 90 F1 AA C8 B1
4350:FE 80 E7 20 1F 43 B2 FE
4358:10 0B 20 86 44 E6 FE D0
4360:F5 E6 FF 80 F1 09 80 20
4368:86 44 EE 73 43 D0 03 EE
4370:74 43 AD DE C0 F0 BC 30
4378:EE A2 2D CA CA CA 30 EA
4380:DD 95 44 D0 F6 7C 96 44
4388:A9 02 2C A9 01 2C A9 00
4390:8D B9 43 20 1F 43 9C 8D
4398:44 9C 8E 44 9C 8F 44 A2
43A0:10 F8 06 FE 26 FF A0 FD
43A8:B9 90 43 79 90 43 99 90
43B0:43 C8 D0 F4 CA D0 EB D8
43B8:A0 03 F0 0A B9 8D 44 20
43C0:6E 44 20 86 44 88 B9 8D
43C8:44 20 61 44 88 10 F7 80
43D0:99 20 1F 43 8A 10 0A A9
43D8:AD 20 86 44 8A 49 FF AA
43E0:E8 86 FE 64 FF A9 01 8D
43E8:B9 43 80 AA A9 31 2C A9
43F0:B1 8D 01 44 20 1F 43 A0
43F8:08 8A 0A AA A9 B0 90 02
4400:A9 B1 20 86 44 88 D0 F1
4408:80 C5 A9 06 2C A9 03 8D
4410:2C 44 20 1F 43 A2 00 A5
4418:FE 29 07 18 69 B0 9D 8D
4420:44 A0 03 46 FF 66 FE 88
4428:D0 F9 E8 E0 06 D0 E8 CA
4430:30 9D BD 8D 44 20 86 44
4438:80 F5 20 1F 43 B2 FE F0
4440:8E 20 86 44 E6 FE D0 F5
4448:E6 FF 80 F1 20 1F 43 A0
4450:00 B1 FE F0 B3 AA C8 B1
4458:FE 20 86 44 CA D0 F7 F0
4460:A7 20 6E 44 A5 FE 20 86
4468:44 A5 FF 4C 86 44 48 4A
4470:4A 4A 4A 20 79 44 85 FE
4478:68 29 0F C9 0A 90 02 69
4480:06 69 B0 85 FF 60 8D DE
4488:C0 EE 87 44 60 00 00 00
4490:00 00 00 00 00 3F EC 43
4498:25 EF 43 62 D1 43 75 88
44A0:43 64 8B 43 23 8E 43 78
44A8:35 43 24 34 43 26 44 43
44B0:40 43 43 4F 0A 44 6F 0D
44B8:44 70 4C 44 73 3A 44 61
44C0:53 43
*/
; Assemble-time diagnostic information
.macro DEBUG text
.if 0
.out text
.endif
.endmacro
; This will take a printf-style string and compact it. The '%' is the escape
; character to output the next byte in ASCII (high bit clear) and print a var.
; Otherwise the remaining chars will default to literals having their high bit
; set. To output a literal '%' you will need to manually add it
; as the %% outputs confusingly enough is a single ASCII '%' which is print binary
.macro PRINTM text, endbyte ; text2, text3, text4, text5, text6
.local h
h .set $80
.repeat .strlen(text), I
.if (.strat(text , I) = '%')
; handle special case of last char was %
.if( h = $00 )
.byte .strat(text, I) ; ASCII % = PrintBin
h .set $80
.else
h .set $00
.endif
.else
.byte .strat(text, I) | h
h .set $80
.endif
.endrep
.ifnblank endbyte
.byte endbyte
.endif
.endmacro
; Force APPLE 'text' to have high bit on
; Will display as NORMAL characters
.macro APPLE text
.repeat .strlen(text), I
.byte .strat(text, I) | $80
.endrep
.endmacro
; Force APPLE 'text' with high bit on but last character has high bit off
; Will display as NORMAL characters (last character will appear FLASHING)
; Merlin: Macro Assembler -- Dextral Character Inverted
.macro DCI text
.repeat .strlen(text)-1, I
.byte .strat(text, I) | $80
.endrep
.byte .strat(text, .strlen(text)-1) & $7F
.endmacro
; Force ASCII 'text' to be control chars: $00..$1F
; Will display as INVERSE characters
.macro CTRL text
.repeat .strlen(text), I
.byte .strat(text, I) & $1F
.endrep
.endmacro
; Force ASCII 'text' to be control chars: $00..$3F
; Will display as INVERSE characters
.macro INV text
.repeat .strlen(text), I
.byte .strat(text, I) & $3F
.endrep
.endmacro
.macro PASCAL text
.byte .strlen(text)
APPLE text
.endmacro
.macro db val
.byte val
.endmacro
.macro dw val
.word val
.endmacro
.macro ds bytes
.res bytes
.endmacro
; Include necessary components based on features requested
ENABLE_BIN = USE_BIN_ASC || USE_BIN_INV
ENABLE_DEC = USE_DEC_2 || USE_DEC_3 || USE_DEC_5 || USE_DEC_BYTE
ENABLE_HEX = USE_HEX_2 || USE_HEX_4 || USE_PTR_2 || USE_PTR_4
ENABLE_OCT = USE_OCT_3 || USE_OCT_6
ENABLE_PTR = USE_PTR_2 || USE_PTR_4
ENABLE_STR = USE_STR_A || USE_STR_C || USE_STR_PASCAL
NumMeta = 0 + \
USE_BIN_ASC + \
USE_BIN_INV + \
USE_DEC_2 + \
USE_DEC_3 + \
USE_DEC_5 + \
USE_DEC_BYTE + \
USE_HEX_2 + \
USE_HEX_4 + \
USE_OCT_3 + \
USE_OCT_6 + \
USE_PTR_2 + \
USE_PTR_4 + \
USE_STR_A + \
USE_STR_C + \
USE_STR_PASCAL
DEBUG .sprintf( "Features enabled: %d", NumMeta )
; Only used by demo
BASL = $28 ; TXT pointer to cursor
BASH = $29
GBASL = $26 ; HGR pointer to cursor
GBASH = $27
HGRPAGE = $E6 ; used by HPOSN
HPOSN = $F411 ; A=row, X=col.lo,Y=col.hi, sets GBASL, GBASH
BASCALC = $FBC1 ; A=row, sets BASL, BASH
HOME = $FC58
TABV = $FB5B
COUT = $FDED
PRBYTE = $FDDA ; print A in hex
demoptr = $FC
demotmp = $FE
__MAIN = $4000
; DOS3.3 meta -- remove these 2 if running under ProDOS
.word __MAIN ; 2 byte BLOAD address
.word __END - __MAIN ; 2 byte BLOAD size
/*
Output:
X=39 Y=191 $=3FF7:D5 11010101~10101011
Bin ASC: 11010101
Bin INV: 11010101
Dec2: 99
Dec3: 999
Dec5: 65385
Byte=-128 -001 000 001 127
Hex2: 34
Hex4: 1234
Ptr2: 2000:D5
Ptr4: 2000:AAD5
Oct3: 666
Oct6: 031337
Apple : 'HOME'
C : 'HELLO','WORLD'
Pascal: 'Pascal Len 13'
printm().size = $0209 000521 bytes
.features = $ 0F 000015
*/
.org __MAIN ; .org must come after header else offsets are wrong
; Demo printm
JSR HOME
LDA #$20
STA HGRPAGE
LDA #$D5
STA $2000
LDA #$AA
STA $2001
LDA ARGS_DEMO+4 ;HGR Y row
LDX #$00 ; HGR x.col_lo = 0
LDY #$00 ; x.col_hi = 0
JSR HPOSN
CLC
LDA GBASL
ADC ARGS_DEMO+2 ; HGR x col
STA GBASL
TAX
LDY GBASH
STX ARGS_DEMO+6 ; aArg[3]
STY ARGS_DEMO+7
STX ARGS_DEMO+8 ; aArg[4]
STY ARGS_DEMO+9
LDA $2000
LDY #0
STA (GBASL),Y
STA ARGS_DEMO+10 ; aArg[5]
STZ ARGS_DEMO+11
STA ARGS_BIN_ASC+2
STA ARGS_BIN_INV+2
JSR ReverseByte
STA ARGS_DEMO+12 ; aArg[6]
STZ ARGS_DEMO+13
.if ENABLE_BIN && ENABLE_DEC && ENABLE_HEX
LDY #0
JSR VTABY
LDX #<ARGS_DEMO ; Low Byte of Address
LDY #>ARGS_DEMO ; High Byte of Address
JSR PrintM
.endif
.if ENABLE_BIN
DEBUG "+BIN"
.if USE_BIN_ASC
DEBUG "____:ASC"
LDY #1
JSR VTABY
LDX #<ARGS_BIN_ASC
LDY #>ARGS_BIN_ASC
JSR PrintM
.endif
.if USE_BIN_INV
DEBUG "____:INV"
LDY #2
JSR VTABY
LDX #<ARGS_BIN_INV
LDY #>ARGS_BIN_INV
JSR PrintM
.endif
.endif
.if ENABLE_DEC
DEBUG "+DEC"
.if USE_DEC_2
DEBUG "____:Dec2"
LDY #3
JSR VTABY
LDX #<ARGS_DEC_2
LDY #>ARGS_DEC_2
JSR PrintM
.endif
.if USE_DEC_3
DEBUG "____:Dec3"
LDY #4
JSR VTABY
LDX #<ARGS_DEC_3
LDY #>ARGS_DEC_3
JSR PrintM
.endif
.if USE_DEC_5
DEBUG "____:Dec5"
LDY #5
JSR VTABY
LDX #<ARGS_DEC_5
LDY #>ARGS_DEC_5
JSR PrintM
.endif
.if USE_DEC_BYTE
DEBUG "____:DecB"
LDY #6
JSR VTABY
LDX #<ARGS_DEC_BYTE
LDY #>ARGS_DEC_BYTE
JSR PrintM
.endif ; USE_DEC_BYTE
.endif
.if ENABLE_HEX
DEBUG "+HEX"
.if USE_HEX_2
DEBUG "____:Hex2"
LDY #7
JSR VTABY
LDX #<ARGS_HEX_2
LDY #>ARGS_HEX_2
JSR PrintM
.endif
.if USE_HEX_4
DEBUG "____:Hex4"
LDY #8
JSR VTABY
LDX #<ARGS_HEX_4
LDY #>ARGS_HEX_4
JSR PrintM
.endif
.if USE_PTR_2
DEBUG "____:Ptr2"
LDY #9
JSR VTABY
LDX #<ARGS_PTR_2
LDY #>ARGS_PTR_2
JSR PrintM
.endif
.if USE_PTR_4
DEBUG "____:Ptr4"
LDY #10
JSR VTABY
LDX #<ARGS_PTR_4
LDY #>ARGS_PTR_4
JSR PrintM
.endif
.endif
.if ENABLE_OCT
DEBUG "+OCT"
.if USE_OCT_3
DEBUG "____:Oct3"
LDY #11
JSR VTABY
LDX #<ARGS_OCT_3
LDY #>ARGS_OCT_3
JSR PrintM
.endif
.if USE_OCT_6
DEBUG "____:Oct6"
LDY #12
JSR VTABY
LDX #<ARGS_OCT_6
LDY #>ARGS_OCT_6
JSR PrintM
.endif
.endif
.if ENABLE_STR
DEBUG "+STR"
.if USE_STR_A
DEBUG "____:StrA"
LDY #13
JSR VTABY
LDX #<ARGS_STR_A
LDY #>ARGS_STR_A
JSR PrintM
.endif
.if USE_STR_C
DEBUG "____:StrC"
LDY #14
JSR VTABY
LDX #<ARGS_STR_C
LDY #>ARGS_STR_C
JSR PrintM
.endif
.if USE_STR_PASCAL
DEBUG "____:StrP"
LDY #15
JSR VTABY
LDX #<ARGS_STR_PASCAL
LDY #>ARGS_STR_PASCAL
JSR PrintM
.endif
.endif ; ENABLE_STR
LDA #17
JSR TABV
; "old-skool" text/hex printing: use ROM funcs
LDX #<PRINTM_TEXT
LDY #>PRINTM_TEXT
JSR PrintStringZ
LDA PRINTM_SIZE+1
STA demotmp+1
JSR PRBYTE
LDA PRINTM_SIZE+0
STA demotmp+0
JSR PRBYTE
JSR PrintSpc
JSR PrintDec
LDX #<PRINTM_CMDS
LDY #>PRINTM_CMDS
JSR PrintStringZ
LDX #NumMeta
STX demotmp+0
STZ demotmp+1
TXA
JSR PRBYTE
JSR PrintSpc
JSR PrintDec
LDA #$8D
JMP COUT
; ======================================================================
; ds 256 - <*
; Print demotmp in Decimal
; NOTE: Can't use printm PrintDec5 as it may not be enabled/available
PrintDec
STZ _bcd+0
STZ _bcd+1
STZ _bcd+2
LDX #16 ; 16 bits
SED ; Double Dabble
@Dec2BCD:
ASL demotmp+0
ROL demotmp+1
LDY #$FD
@DoubleDabble:
LDA _bcd-$FD,Y
ADC _bcd-$FD,Y
STA _bcd-$FD,Y
INY
BNE @DoubleDabble
DEX
BNE @Dec2BCD
CLD
LDX #2 ; print 3 BCD bytes
@BCD2Char: ; NOTE: Digits are reversed!
DEY ; $FF - $FD = 2
LDA _bcd-$FD,Y ; __c??? _b_?XX a_YYXX
LSR
LSR
LSR
LSR
CLC
ADC #'0'+$80
JSR COUT ; __c??X _b_YXX aZYYXX
LDA _bcd-$FD,Y ; __c??X _b_YXX aZYYXX
AND #$F
CLC
ADC #'0'+$80
JSR COUT ; __c?XX _bYYXX ZZYYXX
DEX
BPL @BCD2Char
RTS
; NOTE: Can't use printm PrintStr*() as it may not be enabled/available
PrintStringZ
STX demoptr+0
STY demoptr+1
LDY #0
@_Text
LDA (demoptr),Y
BEQ @_Done
JSR COUT
INY
BNE @_Text
@_Done
RTS
ReverseByte
LDX #8
STA demotmp ; temp working byte
ReverseBit
ASL demotmp ; temp working byte
ROR
DEX
BNE ReverseBit
RTS
PrintSpc
LDA #' '+$80
JMP COUT
VTABY TYA
JSR BASCALC
LDX BASL
LDY BASH
STX PutChar+1
STY PutChar+2
RTS
; ______________________________________________________________________
TEXT_DEMO
;byte "X=## Y=ddd $=xxxx:@@ %%%%%%%%~????????"
PRINTM "X=%# Y=%d $=%x:%@ %%~%?", 0
ARGS_DEMO
dw TEXT_DEMO; aArg[ 0] text
dw 39 ; aArg[ 1] x
dw 191 ; aArg[ 2] y
dw $C0DE ; aArg[ 3] addr ScreenAddr
dw $C0DE ; aArg[ 4] byte ScreenAddr pointer
dw $DA1A ; aArg[ 5] bits ScreenByte
dw $DA1A ; aArg[ 6] bits ScreenByte reversed
; ______________________________________________________________________
TEXT_BIN_ASC PRINTM "Bin ASC: %%", 0
TEXT_BIN_INV PRINTM "Bin INV: %?", 0
ARGS_BIN_ASC
dw TEXT_BIN_ASC
dw $DA1A
ARGS_BIN_INV
dw TEXT_BIN_INV
dw $DA1A
; ______________________________________________________________________
TEXT_DEC_2 PRINTM "Dec2: %#", 0
TEXT_DEC_3 PRINTM "Dec3: %d", 0
TEXT_DEC_5 PRINTM "Dec5: %u", 0
TEXT_DEC_BYTE PRINTM "Byte=%b %b %b %b %b", 0
;TEXT_DEC_BYTE PRINTM "%b",0
ARGS_DEC_2
dw TEXT_DEC_2
dw 99 ;
ARGS_DEC_3
dw TEXT_DEC_3
dw 999 ;
ARGS_DEC_5
dw TEXT_DEC_5
dw $FF69 ; $FF69 = 65385
ARGS_DEC_BYTE
dw TEXT_DEC_BYTE
dw $80 ; -128
dw $FF ; -001
dw $00 ; 000
dw $01 ; +001
dw $7F ; +127
; ______________________________________________________________________
TEXT_HEX_2 PRINTM "Hex2: %$", 0
TEXT_HEX_4 PRINTM "Hex4: %x", 0
TEXT_PTR_2 PRINTM "Ptr2: %x:%@", 0
TEXT_PTR_4 PRINTM "Ptr4: %x:%&", 0
ARGS_HEX_2
dw TEXT_HEX_2
dw $1234
ARGS_HEX_4
dw TEXT_HEX_4
dw $1234
ARGS_PTR_2
dw TEXT_PTR_2
dw $2000
dw $2000
ARGS_PTR_4
dw TEXT_PTR_4
dw $2000
dw $2000
; ______________________________________________________________________
TEXT_OCT_3 PRINTM "Oct3: %o", 0
TEXT_OCT_6 PRINTM "Oct6: %O", 0
ARGS_OCT_3
dw TEXT_OCT_3
dw 438
ARGS_OCT_6
dw TEXT_OCT_6
dw 13023
; ______________________________________________________________________
TEXT_HELLO
APPLE "HELLO"
db 0
TEXT_WORLD
APPLE "WORLD"
db 0
TEXT_DCI
DCI "HOME"
TEXT_PASCAL
PASCAL "Pascal Len 13"
TEXT_STR_C
PRINTM "C : '%s','%s'", 0
TEXT_STR_A
PRINTM "Apple : '%a'", 0
TEXT_STR_PASCAL
PRINTM "Pascal: '%p'", 0
ARGS_STR_C
dw TEXT_STR_C
dw TEXT_HELLO
dw TEXT_WORLD
ARGS_STR_A
dw TEXT_STR_A
dw TEXT_DCI
ARGS_STR_PASCAL
dw TEXT_STR_PASCAL
dw TEXT_PASCAL
; ______________________________________________________________________
PRINTM_TEXT APPLE "printm().size = $"
db 0
PRINTM_CMDS APPLE " bytes"
db $8D
APPLE " .features = $ "
db 0
__LIB_SIZE = __END - __PRINTM
PRINTM_SIZE
dw __LIB_SIZE
; Pad until end of page so PrintM starts on new page
; ds (256 - <*) & 7
; ds (256 - <*) & 15
; ds (256 - <*)
; ----------------------------------------------------------------------
; ----------------------------------------------------------------------
;
; printm() library code starts here
;
; ----------------------------------------------------------------------
; ----------------------------------------------------------------------
__PRINTM
; pointer for PrintPtr2, PrintPtr4, PrintStrA, PrintStrC, PrintStrP
_temp = $FE
; self-modifying variable aliases
_pScreen = PutChar +1
_pFormat = GetFormat +1
_pArg = NxtArgByte+1
.if ENABLE_DEC
_nDecWidth = DecWidth +1
.endif
.if ENABLE_OCT
_nOctWidth = OctWidth +1
.endif
; Entry Point
; ======================================================================
; printm( format, args, ... )
; ======================================================================
PrintM
STX _pArg+0
STY _pArg+1
FirstArg
JSR NxtArgYX
STX _pFormat+0 ; lo
STY _pFormat+1 ; hi
BRA GetFormat ; always
; ======================================================================
; @return next arg as 16-bit arg value in Y,X
NxtArgToTemp
NxtArgYX
JSR NxtArgByte
TAX
; @return _Arg[ _Num ]
NxtArgByte
LDA $C0DE ; _pArg NOTE: self-modifying!
INC _pArg+0 ;
BNE @_SamePage
INC _pArg+1 ;
@_SamePage
TAY
; Callers of NxtToArgYX don't use _temp
_NxtArgToTemp
STX _temp+0 ; zero-page for (ZP),Y
STY _temp+1
;XYtoVal
; STX _val+0 ; may be tempting to move this to NxtArgYX
; STY _val+1 ;
_Done
RTS
; $ Hex 2 Byte
; x Hex 4 Byte
; ======================================================================
.if ENABLE_HEX
.if USE_HEX_2
DEBUG .sprintf( "PrintHex2() @ %X", * )
PrintHex2:
CLC
.endif
.if USE_HEX_4
DEBUG .sprintf( "PrintHex4() @ %X", * )
PrintHex4:
.endif
; Print 16-bit Y,X in hex
_PrintHex:
JSR NxtArgYX ; A=Y= high byte
BCC _PrintHexX
PrintHexAX:
;TYA - optimization from NxtArgYX above
JSR PrintHexByte
_PrintHexX:
TXA
PrintHexA:
JSR PrintHexByte
BRA NextFormat
; @ Ptr 2 Byte
; & Ptr 4 Byte
; ======================================================================
.if ENABLE_PTR
.if USE_PTR_2
DEBUG .sprintf( "PrintPtr2() @ %X", * )
PrintPtr2:
CLC
.endif
.if USE_PTR_4
DEBUG .sprintf( "PrintPtr4() @ %X", * )
PrintPtr4:
.endif
_PrintPtr:
JSR NxtArgToTemp
LDY #$0
LDA (_temp),Y
BCC PrintHexA
TAX
INY
LDA (_temp),Y
BRA PrintHexAX ; needs XYtoVal setup
.endif ; ENABLE_PTR
.endif ; ENABLE_HEX
; a String (APPLE text, last byte ASCII)
; See: DCI
; ======================================================================
.if ENABLE_STR
.if USE_STR_A
DEBUG .sprintf( "PrintStrA() @ %X", * )
PrintStrA:
JSR NxtArgToTemp
_PrintStrA:
LDA (_temp)
BPL @_LastChar
JSR PutChar
INC _temp+0
BNE _PrintStrA
INC _temp+1
BRA _PrintStrA
@_LastChar: ; intentional fall into ForceHighBit Print
.endif ; USE_STR_A
.endif ; ENABLE_STR
; ======================================================================
; Main Read/Eval/Print/Loop of printm()
; ======================================================================
; Note: The dummy address $C0DE is to force the assembler
; to generate a 16-bit address instead of optimizing a ZP operand
ForceHighBit
ORA #$80
Print ; print literal chars
JSR PutChar
NextFormat ; Adjust pointer to next char in format
INC _pFormat+0
BNE GetFormat
INC _pFormat+1
GetFormat
LDA $C0DE ; _pFormat NOTE: self-modifying!
BEQ _Done ; zero-terminated
BMI Print ; neg = literal
; NOTE: If all features are turned off LDX #-1 ca65 throws Range Error
; NumMeta = _MetaCharEnd - MetaChar
; LDX #NumMeta-1 ; pos = meta
; We can't use this equation since it is not const due to the assembler
; not having defined _MetaCharEnd yet
; Instead we count the number of features enabled
GetNumFeatures
.if (NumMeta > 0)
LDX #NumMeta*3 ; pos = meta
.else
.out "INFO: No meta commands, defaulting to text"
BRA ForceHighBit
.endif
.if NumMeta
FindMeta
DEX
DEX
DEX
BMI NextFormat
CMP MetaTable,X
BNE FindMeta
CallMeta
JMP (MetaTable+1,X)
; ______________________________________________________________________
; # Dec 1 Byte (max 2 digits)
; d Dec 2 Byte (max 3 digits)
; u Dec 2 Byte (max 5 digits)
; ======================================================================
.if ENABLE_DEC
.if USE_DEC_5
DEBUG .sprintf( "PrintDec5() @ %X", * )
PrintDec5:
LDA #5/2 ; offset into _bcd buffer
.if USE_DEC_2 || USE_DEC_3
db $2C ; BIT $abs skip next instruction
.endif
.endif
.if USE_DEC_3
DEBUG .sprintf( "PrintDec3() @ %X", * )
PrintDec3:
LDA #3/2 ; offset into bcd buffer
.if USE_DEC_2
db $2C ; BIT $abs skip next instruction
.endif
.endif
.if USE_DEC_2
DEBUG .sprintf( "PrintDec2() @ %X", * )
PrintDec2:
LDA #0 ; special: print 2 digits
.endif
; no .if USE_DEC_BYTE here because ENABLE_DEC already covers that
_PrintDec:
STA _nDecWidth
JSR NxtArgYX
PrintDecYX:
STZ _bcd+0
STZ _bcd+1
STZ _bcd+2
Dec2BCD:
LDX #16 ; 16 bits
SED ; "Double Dabble"
@Dec2BCD: ; https://en.wikipedia.org/wiki/Double_dabble
ASL _temp+0
ROL _temp+1
LDY #$FD ; $00-$FD=-3 bcd[0] bcd[1] bcd[2] bcd[3]
@DoubleDabble: ; Y=FD Y=FE Y=FF Y=00
LDA _bcd-$FD,Y
ADC _bcd-$FD,Y
STA _bcd-$FD,Y
INY
BNE @DoubleDabble
DEX
BNE @Dec2BCD
CLD
DecWidth:
LDY #3 ; default to 6 digits
BEQ @EvenBCD ; special case 0 -> only 2 digits
; otherwise have odd digits,
; Print low nibble, skip high nibble
@OddBCD: ; Y = num digits/2 to print
LDA _bcd,Y ; __c??? _b_?XX a_YYXX
JSR HexA
JSR PutChar
DEY
@EvenBCD:
LDA _bcd,Y ; __c??? _b_?XX a_YYXX
JSR PrintHexByte
DEY
BPL @EvenBCD
.endif
_JumpNextFormat1
BRA NextFormat ; always
.if ENABLE_DEC
; b Print a signed byte in decimal
; ======================================================================
.if USE_DEC_BYTE
DEBUG .sprintf( "PrintDecB() @ %X", * )
PrintByte:
JSR NxtArgYX ; X = low byte, Y=A high byte
TXA
BPL PrintBytePos
LDA #'-' + $80 ; X >= $80 --> $80 (-128) .. $FF (-1)
JSR PutChar
TXA
EOR #$FF ; 2's complement
TAX
INX
PrintBytePos:
STX _temp+0 ; needs XYtoTemp setup
STZ _temp+1 ; 00XX
LDA #3/2 ; 3 digits max
STA _nDecWidth
BRA PrintDecYX
.endif ; USE_DEC_BYTE
.endif ; ENABLE_DEC
; ______________________________________________________________________
; % Bin 1 Byte normal ones, normal zeroes
; ? Bin 1 Byte inverse ones, normal zeroes
; ======================================================================
.if ENABLE_BIN
.if USE_BIN_INV
DEBUG .sprintf( "PrintBinI() @ %X", * )
PrintBinInv:
LDA #$31
.if USE_BIN_ASC
;BNE _PrintBin
db $2C ; BIT $abs skip next instruction
.endif
.endif ; USE_BIN_INV
.if USE_BIN_ASC
DEBUG .sprintf( "PrintBinA() @ %X", * )
PrintBinAsc:
LDA #$B1
.endif ; USE_BIN_ASC
_PrintBin:
STA _PrintBit+1
JSR NxtArgYX ; X = low byte, Y=A = high byte
LDY #8 ; print 8 bits
_Bit2Asc:
TXA
ASL ; C= A>=$80
TAX
LDA #$B0
BCC _FlipBit
_PrintBit:
LDA #$B1 ; 1 -> 31 NOTE: self-modifying!
_FlipBit:
JSR PutChar
DEY
BNE _Bit2Asc
.endif ; ENABLE_BIN
; Left as exercise for the reader to optimize the jump size :-)
; 2 bytes short of BRA NextFormat
_JumpNextFormat2
; BRA NextFormat ; always
; JMP NextFormat ; JMP :-(
BRA _JumpNextFormat1
; ______________________________________________________________________
; o Print byte in octal (max 3 digits)
; O Print word in octal (max 6 digits)
; ======================================================================
.if ENABLE_OCT
.if USE_OCT_6
DEBUG .sprintf( "PrintOct6() @ %X", * )
PrintOct6:
LDA #6
.if USE_OCT_3
db $2C ; BIT $abs skip next instruction
.endif
.endif
.if USE_OCT_3
DEBUG .sprintf( "PrintOct3() @ %X", * )
PrintOct3:
LDA #3
.endif
_PrintOct:
STA _nOctWidth
JSR NxtArgYX ; X = low byte
LDX #0
_Oct2Asc:
LDA _temp
AND #7
CLC
ADC #'0'+$80
STA _bcd,x ; NOTE: Digits are reversed!
LDY #3
@OctShr:
LSR _temp+1
ROR _temp+0
DEY
BNE @OctShr
INX
OctWidth:
CPX #6 ; _nOctDigits NOTE: self-modifying!
BNE _Oct2Asc ; Intentional fall into reverse BCD
; On Entry: X number of chars to print in buffer _bcd
; ======================================================================
PrintReverseBCD
DEX
BMI _JumpNextFormat1
LDA _bcd, X
JSR PutChar
BRA PrintReverseBCD
.endif ; ENABLE_OCT
; ______________________________________________________________________
; s String (C,ASCIIZ)
; ======================================================================
.if ENABLE_STR
.if USE_STR_C
DEBUG .sprintf( "PrintStrC() @ %X", * )
PrintStrC:
JSR NxtArgToTemp
@_NextByte:
LDA (_temp)
BEQ _JumpNextFormat1
JSR PutChar
INC _temp+0
BNE @_NextByte
INC _temp+1 ; support strings > 256 chars
BRA @_NextByte
.endif
.endif
; p String (Pascal)
; ======================================================================
.if ENABLE_STR
.if USE_STR_PASCAL
DEBUG .sprintf( "PrintStrP() @ %X", * )
PrintStrP:
JSR NxtArgToTemp
LDY #$0
LDA (_temp),Y
BEQ _JumpNextFormat2
TAX
_PrintStrP:
INY
LDA (_temp),Y
JSR PutChar
DEX
BNE _PrintStrP
BEQ _JumpNextFormat2 ; always
.endif
.endif ; ENABLE_STR
; ----------------------------------------------------------------------
; Utility
; ----------------------------------------------------------------------
.if ENABLE_HEX || ENABLE_DEC
; Converts A to Hex digits, prints them
PrintHexByte:
DEBUG .sprintf( "PrintHexByte @ %X", * )
JSR HexA
LDA _temp+0
JSR PutChar
PrintHexBotNib:
LDA _temp+1
JMP PutChar
; Converts A to Hex digits, stores two chars in _temp+0, _temp+1
; @return: A will be bottom nibble in ASCII
HexA:
PHA
LSR
LSR
LSR
LSR
JSR _HexNib
STA _temp+0
PLA
_HexNib:
AND #$F
CMP #$A ; n < 10 ?
BCC @Hex2Asc
ADC #6 ; n += 6 $A -> +6 + (C=1) = $11
@Hex2Asc:
ADC #'0' + $80 ; inverse=remove #$80
STA _temp+1
RTS
.endif ; ENABLE_HEX || ENABLE_DEC
.endif ; NumMeta
; ======================================================================
;
PutChar
.if 1
STA $C0DE ; _pScreen NOTE: self-modifying!
INC PutChar+1 ; inc lo
RTS
.else ; Alternatively use the monitor ROM char output
JMP COUT
.endif
;
; ======================================================================
_bcd ds 6 ; 6 chars for printing dec
.if NumMeta
_val dw 0 ; PrintHex2 PrintHex4 temp
MetaTable
.if ENABLE_BIN
.if USE_BIN_INV
db '?' ; PrintBinInv NOTE: 1's printed in inverse
dw PrintBinInv
.endif
.if USE_BIN_ASC
db '%' ; PrintBinAsc
dw PrintBinAsc
.endif
.endif
.if ENABLE_DEC
.if USE_DEC_BYTE
db 'b' ; PrintByte NOTE: Signed -128 .. +127
dw PrintByte
.endif
.if USE_DEC_5
db 'u' ; PrintDec5
dw PrintDec5
.endif
.if USE_DEC_3
db 'd' ; PrintDec3
dw PrintDec3
.endif
.if USE_DEC_2
db '#' ; PrintDec2
dw PrintDec2
.endif
.endif
.if ENABLE_HEX
.if USE_HEX_4
db 'x' ; PrintHex4
dw PrintHex4
.endif
.if USE_HEX_2
db '$' ; PrintHex2
dw PrintHex2
.endif
.if USE_PTR_4
db '&' ; PrintPtr4
dw PrintPtr4
.endif
.if USE_PTR_2
db '@' ; PrintPtr2
dw PrintPtr2
.endif
.endif
.if ENABLE_OCT
.if USE_OCT_6
db 'O' ; PrintOct6
dw PrintOct6
.endif
.if USE_OCT_3
db 'o' ; PrintOct3
dw PrintOct3
.endif
.endif
.if ENABLE_STR
.if USE_STR_PASCAL
db 'p' ; PrintStrP NOTE: Pascal string; C printf 'p' is pointer!
dw PrintStrP
.endif
.if USE_STR_C
db 's' ; PrintStrC NOTE: C string, zero terminated
dw PrintStrC
.endif
.if USE_STR_A
db 'a' ; PrintStrA NOTE: Last byte is ASCII
dw PrintStrA
.endif
.endif
.endif ; NumMeta
__END
DEBUG .sprintf( "_bcd @ %X", _bcd )
DEBUG .sprintf( "Demo size: %X (%d bytes)", __PRINTM-__MAIN, __PRINTM-__MAIN)
DEBUG .sprintf( "Total size: %X (%d bytes)", __END -__MAIN, __END -__MAIN)
.out .sprintf( "printm size: %X (%d bytes)", __LIB_SIZE , __LIB_SIZE )
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