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34 lines
691 B
ArmAsm
34 lines
691 B
ArmAsm
;
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; Ullrich von Bassewitz, 31.05.1998
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;
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; int strcmp (const char* s1, const char* s2);
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;
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.export _strcmp
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.import popptr1
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.importzp ptr1, ptr2
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_strcmp:
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sta ptr2 ; Save s2
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stx ptr2+1
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jsr popptr1 ; Get s1
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;ldy #0 ; Y=0 guaranteed by popptr1
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loop: lda (ptr1),y
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cmp (ptr2),y
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bne L1
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tax ; end of strings?
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beq L3
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iny
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bne loop
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inc ptr1+1
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inc ptr2+1
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bne loop
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L1: bcs L2
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ldx #$FF
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rts
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L2: ldx #$01
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L3: rts
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