| .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 |