mirror of
https://github.com/cc65/cc65.git
synced 2024-11-14 20:05:05 +00:00
61 lines
1005 B
ArmAsm
61 lines
1005 B
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 11.06.1998
|
||
|
|
;
|
||
|
|
; char* strpbrk (const char* s1, const char* s2);
|
||
|
|
;
|
||
|
|
|
||
|
|
.export _strpbrk
|
||
|
|
.import popax, return0
|
||
|
|
.importzp ptr1, ptr2, tmp1, tmp2, tmp3
|
||
|
|
|
||
|
|
_strpbrk:
|
||
|
|
jsr popax ; get s2
|
||
|
|
sta ptr2
|
||
|
|
stx ptr2+1
|
||
|
|
jsr popax ; get s1
|
||
|
|
sta ptr1
|
||
|
|
stx ptr1+1
|
||
|
|
ldy #$00
|
||
|
|
|
||
|
|
L1: lda (ptr1),y ; get next char from s1
|
||
|
|
beq L9 ; jump if done
|
||
|
|
sta tmp2 ; save char
|
||
|
|
iny
|
||
|
|
bne L2
|
||
|
|
inc ptr1+1
|
||
|
|
L2: sty tmp3 ; save index into s1
|
||
|
|
|
||
|
|
ldy #0 ; get index into s2
|
||
|
|
L3: lda (ptr2),y ;
|
||
|
|
beq L4 ; jump if done
|
||
|
|
cmp tmp2
|
||
|
|
beq L6
|
||
|
|
iny
|
||
|
|
bne L3
|
||
|
|
|
||
|
|
; The character was not found in s2. Increment the counter and start over
|
||
|
|
|
||
|
|
L4: ldy tmp3 ; reload index
|
||
|
|
inx
|
||
|
|
bne L1
|
||
|
|
inc tmp1
|
||
|
|
bne L1
|
||
|
|
|
||
|
|
; A character was found. Calculate a pointer to this char in s1 and return it.
|
||
|
|
|
||
|
|
L6: ldx ptr1+1
|
||
|
|
lda tmp3 ; get y offset
|
||
|
|
clc
|
||
|
|
adc ptr1
|
||
|
|
bcc L7
|
||
|
|
inx
|
||
|
|
L7: rts
|
||
|
|
|
||
|
|
; None of the characters in s2 was found - return NULL
|
||
|
|
|
||
|
|
L9: jmp return0
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|