mirror of https://github.com/cc65/cc65.git
94 lines
2.6 KiB
ArmAsm
94 lines
2.6 KiB
ArmAsm
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; Christian Groessler, 10.02.2009
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; derived from strncmp.s and stricmp.s
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;
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; int __fastcall__ strnicmp (const char* s1, const char* s2, size_t count);
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; int __fastcall__ strncasecmp (const char* s1, const char* s2, size_t count);
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;
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.export _strnicmp, _strncasecmp
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.import popax, popptr1
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.importzp ptr1, ptr2, ptr3, tmp1, tmp2
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.import ctypemaskdirect
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.include "ctype.inc"
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_strnicmp:
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_strncasecmp:
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inx
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stx ptr3+1
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tax
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inx
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stx ptr3 ; save count with each byte incremented separately
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; Get the remaining arguments
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jsr popax ; get s2
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sta ptr2
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stx ptr2+1
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jsr popptr1 ; get s1
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; Loop setup
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; ldy #0 Y=0 guaranteed by popptr1
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; Start of compare loop. Check the counter.
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Loop: dec ptr3 ; decrement high byte
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beq IncHi
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; Compare a byte from the strings
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Comp: lda (ptr2),y
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sta tmp2 ; remember original char
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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 ; remember original char
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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 NotEqual ; jump if strings different
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txa ; end of strings?
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beq Equal1 ; jump if EOS reached, a/x == 0
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; Increment the pointers
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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 ; branch always
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; Increment hi byte
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IncHi: dec ptr3+1
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bne Comp ; jump if counter not zero
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; Exit code if strings are equal. a/x not set
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Equal: lda #$00
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tax
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Equal1: rts
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; Exit code if strings not equal
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NotEqual:
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bcs L3
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ldx #$FF ; make result negative
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rts
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L3: ldx #$01 ; make result positive
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rts
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