72 lines
1.3 KiB
Plaintext
72 lines
1.3 KiB
Plaintext
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section .text,text
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public hex_to_ascii
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; Writes the hexdecimal ASCII representation of d0.l to the 11-byte buffer at a0
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hex_to_ascii:
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movem.l d2/d3, -(a7) ; Save old values of d2 and d3 (callee preserved)
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move.b #'0', (a0)+
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move.b #'x', (a0)+
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move.b #0, d1
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move.w #28, d2
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hex_to_ascii_loop:
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cmpi.w #0, d2
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beq.b hex_to_ascii_loop_done
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move.l d0, d3
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lsr.l d2, d3
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andi.l #$F, d3
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cmp.l #0, d3
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bne.b .1
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cmp.b #0, d1
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bne.b .1
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subi.w #4, d2
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bra.b hex_to_ascii_loop
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.1:
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move.b #1, d1
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cmp.b #$A, d3
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blt.b .2
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add.b #('a' - $A), d3
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move.b d3, (a0)+
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bra.b .3
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.2:
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add.b #'0', d3
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move.b d3, (a0)+
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.3:
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subi.w #4, d2
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bra.b hex_to_ascii_loop
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hex_to_ascii_loop_done:
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move.l d0, d3
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andi.l #$F, d3
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cmp.b #$A, d3
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blt.b .2
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add.b #('a' - $A), d3
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move.b d3, (a0)+
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bra.b .3
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.2:
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add.b #'0', d3
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move.b d3, (a0)+
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.3:
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move.b #0, (a0)
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movem.l (a7)+, d2/d3 ; Restore d2 and d3 (callee preserved)
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rts
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; Compares the strings in a0 and a1
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; Returns 0 in d0.b if identical
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; Returns difference of first mismatching character in d0.b (s1-s2) if different
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public strcmp
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strcmp:
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strcmp_loop:
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move.b (a0), d0
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cmp.b (a1), d0
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bne.b strcmp_loop_done
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cmpi.b #0, (a0)
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bne.b .1
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move.b #0, d0
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rts
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.1:
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adda.l #1, a0
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adda.l #1, a1
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bra.b strcmp_loop
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strcmp_loop_done:
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move.b (a0), d0
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sub.b (a1), d0
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rts
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