14 lines
455 B
ArmAsm
14 lines
455 B
ArmAsm
|
.file "memchr.S"
|
||
|
|
|
||
|
|
.section .text
|
||
|
|
|
||
|
|
.global _memchr
|
||
|
|
.type _memchr,@function
|
||
|
|
_memchr:
|
||
|
|
cmp #0, r3 ; If r3 is 0 suntil.b will do nothing and not set any flags...
|
||
|
|
stz #1, r1 ; ...so store 1 into r1. It will be decremented by the SUB later.
|
||
|
|
suntil.b ; Search until *r1 == r2 or r3 bytes have been examined.
|
||
|
|
stnz #1, r1 ; If no match was found return NULL.
|
||
|
|
sub #1, r1 ; suntil.b leaves r1 pointing at the address *after* the match.
|
||
|
|
rts
|