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62 lines
1.9 KiB
ArmAsm
62 lines
1.9 KiB
ArmAsm
; stricmp.s
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;
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; This file is part of
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; cc65 - a freeware C compiler for 6502 based systems
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;
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; https://cc65.github.io
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;
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; See "LICENSE" file for legal information.
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;
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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 popptr1
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.importzp ptr1, ptr2, tmp1, tmp2
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.import ctypemaskdirect
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.include "ctype.inc"
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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 popptr1 ; get s1
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; ldy #0 ; Y=0 guaranteed by popptr1
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loop: lda (ptr2),y ; get char from second string
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sta tmp2 ; and save it
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jsr ctypemaskdirect ; get character classification
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and #CT_LOWER ; lower case char?
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beq L1 ; jump if no
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lda #<('A'-'a') ; make upper case char
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adc tmp2 ; ctypemaskdirect ensures carry clear!
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sta tmp2 ; remember upper case equivalent
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L1: lda (ptr1),y ; get character from first string
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sta tmp1
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jsr ctypemaskdirect ; get character classification
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and #CT_LOWER ; lower case char?
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beq L2 ; jump if no
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lda #<('A'-'a') ; make upper case char
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adc tmp1 ; ctypemaskdirect ensures carry clear!
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sta tmp1 ; remember upper case equivalent
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L2: ldx tmp1
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cpx tmp2 ; 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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