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https://github.com/byteworksinc/ORCALib.git
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printf: Unify code for hex and octal formatting.
These are similar enough that they can use the same code with just a few conditionals, which saves space. (This same code can also be used for binary when that is added.)
This commit is contained in:
Stephen Heumann
parent
67ae5f7b44
commit
78a9e1d93b
218
stdio.asm
218
stdio.asm
@ -4520,9 +4520,12 @@ lb1 clc restore the original argp+4
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****************************************************************
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*
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* ~Format_o - format an octal number
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* ~Format_x - format a hexadecimal number (lowercase output)
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* ~Format_X - format a hexadecimal number (uppercase output)
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* ~Format_p - format a pointer
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*
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* Inputs:
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* ~altForm - use a leading '0'?
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* ~altForm - use a leading '0' (octal) or '0x' (hex)?
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* ~fieldWidth - output field width
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* ~paddChar - padd character
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* ~leftJustify - left justify the output?
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@ -4536,15 +4539,34 @@ lb1 clc restore the original argp+4
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~Format_o private
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using ~printfCommon
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argp equ 7 argument pointer
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lda #3 use 3 bits per output character
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bra cn0
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~Format_x entry
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;
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; Set the "or" value; this is used to set the case of character results
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;
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lda #$20*256
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sta ~orVal
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bra hx0
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~Format_p entry
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inc ~isLong
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~Format_X entry
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stz ~orVal
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hx0 lda #4 use 4 bits per output character
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;
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; Initialization
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;
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cn0 sta bitsPerChar
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stz ~hexPrefix assume we won't lead with 0x
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stz ~sign ignore the sign flag
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lda #' ' initialize the string to blanks
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sta ~str
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move ~str,~str+1,#l:~str-1
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stz ~num+2 get the value to convert
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lda ~isLongLong
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lda ~isLongLong get the value to convert
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beq cn1
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ldy #6
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lda [argp],Y
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@ -4555,7 +4577,7 @@ argp equ 7 argument pointer
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sta ~num+4
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cn1 lda ~isLong
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beq cn2
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cn1a ldy #2
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ldy #2
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lda [argp],Y
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sta ~num+2
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cn2 lda [argp]
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@ -4563,17 +4585,24 @@ cn2 lda [argp]
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beq cn2a
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and #$00FF
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cn2a sta ~num
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ldx bitsPerChar if doing hex format then
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cpx #3
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beq cn2b
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ldx ~altForm if alt form has been selected then
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beq cn2b
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ora ~num+2 if value is not 0 then
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ora ~num+4
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ora ~num+6
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beq cn2b
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lda #'X0' set hex prefix to '0X' or '0x'
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ora ~orVal
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sta ~hexPrefix
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;
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; Convert the number to an ASCII string
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;
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ldy #l:~str-1 set up the character index
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cn3 lda ~num+6 quit if the number is zero
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ora ~num+4
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ora ~num+2
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ora ~num
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beq al1
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lda #'0' roll off 3 bits
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ldx #3
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cn2b ldy #l:~str-1 set up the character index
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cn3 lda #' 0' roll off 4 bits
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ldx bitsPerChar
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cn4 lsr ~num+6
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ror ~num+4
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ror ~num+2
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@ -4581,32 +4610,46 @@ cn4 lsr ~num+6
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ror A
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dex
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bne cn4
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xba
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asl A form a character
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asl A
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asl A
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dey
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ora #' '
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xba form a character
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ldx bitsPerChar
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cn4a asl A
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dex
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bne cn4a
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cmp #('9'+1)*256+' ' if the character should be alpha then
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blt cn5
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clc
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adc #7*256 adjust it
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ora ~orVal
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cn5 dey
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sta ~str,Y save the character
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bra cn3
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lda ~num+6 loop if the number is not zero
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ora ~num+4
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ora ~num+2
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ora ~num
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bne cn3
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;
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; If a leading zero is required, be sure we include one
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; If a leading '0x' is required, be sure we include one
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;
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al1 lda ~altForm if alt form has been selected then
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beq al2
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lda ~precision make sure precision is non-zero
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lda bitsPerChar if doing octal format then
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cmp #3
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bne al3
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lda ~altForm if alt form has been selected then
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beq al3
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lda ~precision make sure precision is non-zero
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bne al2
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inc ~precision
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bra al3 include a zero in the string
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al2 cpy #l:~str-1 else if string has no characters then
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bne al4
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al3 lda #'0 ' include a zero in the string
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sta ~str-1,Y
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al2 lda #'0 ' if the result is not ' 0' then
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cmp ~str+l:~str-2
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beq al3
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sta ~str-1,Y include a zero in the string
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;
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; Piggy back off of ~Format_d for output
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;
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al4 stz ~hexPrefix don't lead with 0x
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brl ~Format_IntOut
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al3 brl ~Format_IntOut
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;
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; Local data
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;
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bitsPerChar ds 2 bits per output character
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end
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****************************************************************
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@ -4684,119 +4727,6 @@ lb4 clc restore and increment argp
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brl ~LeftJustify handle left justification
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end
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****************************************************************
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*
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* ~Format_x - format a hexadecimal number (lowercase output)
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* ~Format_X - format a hexadecimal number (uppercase output)
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* ~Format_p - format a pointer
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*
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* Inputs:
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* ~altForm - use a leading '0x'?
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* ~fieldWidth - output field width
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* ~paddChar - padd character
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* ~leftJustify - left justify the output?
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* ~isLong - is the operand long?
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* ~isLongLong - is the operand long long?
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* ~precision - precision of output
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* ~precisionSpecified - was the precision specified?
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*
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****************************************************************
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*
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~Format_x private
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using ~printfCommon
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argp equ 7 argument pointer
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;
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; Set the "or" value; this is used to set the case of character results
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;
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lda #$20
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sta ~orVal
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bra cn0
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~Format_p entry
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inc ~isLong
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~Format_X entry
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stz ~orVal
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;
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; Initialization
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;
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cn0 stz ~sign ignore the sign flag
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lda #' ' initialize the string to blanks
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sta ~str
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move ~str,~str+1,#l:~str-1
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stz ~num+2 get the value to convert
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stz ~num+4
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stz ~num+6
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lda ~isLongLong
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beq cn1
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ldy #6
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lda [argp],Y
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sta ~num+6
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dey
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dey
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lda [argp],Y
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sta ~num+4
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cn1 lda ~isLong
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beq cn2
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ldy #2
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lda [argp],Y
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sta ~num+2
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cn2 lda [argp]
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ldx ~isByte
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beq cn2a
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and #$00FF
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cn2a sta ~num
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ora ~num+2
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ora ~num+4
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ora ~num+6
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bne cn2b
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stz ~altForm if value is 0, do not print hex prefix
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cn2b stz ~hexPrefix assume we won't lead with 0x
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;
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; Convert the number to an ASCII string
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;
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ldy #l:~str-1 set up the character index
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cn3 lda #'0' roll off 4 bits
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ldx #4
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cn4 lsr ~num+6
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ror ~num+4
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ror ~num+2
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ror ~num
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ror A
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dex
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bne cn4
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xba form a character
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lsr A
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lsr A
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lsr A
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lsr A
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cmp #'9'+1 if the character should be alpha,
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blt cn5 adjust it
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adc #6
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ora ~orVal
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cn5 xba
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dey
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ora #' '
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sta ~str,Y save the character
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lda ~num+6 loop if the number is not zero
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ora ~num+4
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ora ~num+2
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ora ~num
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bne cn3
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;
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; If a leading '0x' is required, be sure we include one
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;
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lda ~altForm branch if no leading '0x' is required
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beq al3
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lda #'0X' insert leading '0x'
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ora ~orVal
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xba
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sta ~hexPrefix
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;
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; Piggy back off of ~Format_d for output
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;
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al3 brl ~Format_IntOut
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end
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****************************************************************
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*
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* ~Format_Percent - format the '%' character
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@ -5348,7 +5278,7 @@ fListEnd anop
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;
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; Work buffers
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;
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~num ds 8 long long integer
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~num ds 8 long long integer (must be 0 after each conversion)
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~numChars ds 2 number of characters printed with this printf
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~orVal ds 2 value to 'or' with to set case of characters
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~str ds 83 string buffer
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