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60 lines
1.1 KiB
ArmAsm
60 lines
1.1 KiB
ArmAsm
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; Ullrich von Bassewitz, 03.06.1998
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; int stricmp (const char* s1, const char* s2); /* DOS way */
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; int strcasecmp (const char* s1, const char* s2); /* UNIX way */
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;
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.export _stricmp, _strcasecmp
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.import popax
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.import __ctype, __cdiff
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.importzp ptr1, ptr2, tmp1
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_stricmp:
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_strcasecmp:
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sta ptr2 ; Save s2
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stx ptr2+1
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jsr popax ; get s1
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sta ptr1
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stx ptr1+1
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ldy #0
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loop: lda (ptr2),y ; get char from second string
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tax
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lda __ctype,x ; get character classification
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and #$01 ; lower case char?
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beq L1 ; jump if no
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txa ; get character back
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clc
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adc __cdiff ; make upper case char
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tax ;
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L1: stx tmp1 ; remember upper case equivalent
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lda (ptr1),y ; get character from first string
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tax
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lda __ctype,x ; get character classification
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and #$01 ; lower case char?
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beq L2 ; jump if no
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txa ; get character back
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clc
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adc __cdiff ; make upper case char
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tax
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L2: cpx tmp1 ; compare characters
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bne L3
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txa ; end of strings?
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beq L5 ; a/x both zero
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iny
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bne loop
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inc ptr1+1
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inc ptr2+1
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bne loop
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L3: bcs L4
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ldx #$FF
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rts
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L4: ldx #$01
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L5: rts
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