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printf: optimize hex and octal printing code.

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This also fixes a bug: printf("%#.0o\n", 0) should print "0", rather than nothing.
This commit is contained in:
Stephen Heumann 2023-04-17 19:36:45 -05:00
parent 80c0bbc32b
commit 67ae5f7b44
1 changed files with 32 additions and 49 deletions
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81
stdio.asm
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@ -4566,53 +4566,46 @@ cn2a sta ~num
;
; Convert the number to an ASCII string
;
short I,M
ldy #l:~str-1 set up the character index
cn3 lda ~num+7 quit if the number is zero
ora ~num+6
ora ~num+5
cn3 lda ~num+6 quit if the number is zero
ora ~num+4
ora ~num+3
ora ~num+2
ora ~num+1
ora ~num
beq al1
lda #0 roll off 3 bits
lda #'0' roll off 3 bits
ldx #3
cn4 lsr ~num+7
ror ~num+6
ror ~num+5
cn4 lsr ~num+6
ror ~num+4
ror ~num+3
ror ~num+2
ror ~num+1
ror ~num
ror A
dex
bne cn4
lsr A form a character
lsr A
lsr A
lsr A
lsr A
ora #'0'
sta ~str,Y save the character
xba
asl A form a character
asl A
asl A
dey
ora #' '
sta ~str,Y save the character
bra cn3
;
; If a leading zero is required, be sure we include one
;
al1 cpy #l:~str-1 include a zero if no characters have
beq al2 been placed in the string
lda ~altForm branch if no leading zero is required
beq al3
al2 lda #'0'
sta ~str,Y
al3 long I,M
al1 lda ~altForm if alt form has been selected then
beq al2
lda ~precision make sure precision is non-zero
bne al3
inc ~precision
bra al3 include a zero in the string
al2 cpy #l:~str-1 else if string has no characters then
bne al4
al3 lda #'0 ' include a zero in the string
sta ~str-1,Y
;
; Piggy back off of ~Format_d for output
;
stz ~hexPrefix don't lead with 0x
al4 stz ~hexPrefix don't lead with 0x
brl ~Format_IntOut
end
@ -4720,8 +4713,7 @@ argp equ 7 argument pointer
bra cn0
~Format_p entry
lda #1
sta ~isLong
inc ~isLong
~Format_X entry
stz ~orVal
;
@ -4762,39 +4754,32 @@ cn2b stz ~hexPrefix assume we won't lead with 0x
;
; Convert the number to an ASCII string
;
short I,M
ldy #l:~str-1 set up the character index
cn3 lda #0 roll off 4 bits
cn3 lda #'0' roll off 4 bits
ldx #4
cn4 lsr ~num+7
ror ~num+6
ror ~num+5
cn4 lsr ~num+6
ror ~num+4
ror ~num+3
ror ~num+2
ror ~num+1
ror ~num
ror A
dex
bne cn4
lsr A form a character
xba form a character
lsr A
lsr A
lsr A
lsr A
ora #'0'
cmp #'9'+1 if the character should be alpha,
blt cn5 adjust it
adc #6
ora ~orVal
cn5 sta ~str,Y save the character
cn5 xba
dey
lda ~num+7 loop if the number is not zero
ora ~num+6
ora ~num+5
ora #' '
sta ~str,Y save the character
lda ~num+6 loop if the number is not zero
ora ~num+4
ora ~num+3
ora ~num+2
ora ~num+1
ora ~num
bne cn3
;
@ -4802,16 +4787,14 @@ cn5 sta ~str,Y save the character
;
lda ~altForm branch if no leading '0x' is required
beq al3
al2 lda #'X' insert leading '0x'
lda #'0X' insert leading '0x'
ora ~orVal
sta ~hexPrefix+1
lda #'0'
xba
sta ~hexPrefix
al3 long I,M
;
; Piggy back off of ~Format_d for output
;
brl ~Format_IntOut
al3 brl ~Format_IntOut
end
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