.global getipstr

getipstr:
    MOV R12, #10

L1:
    MOV R2, #0

L2:
    LDRB R3, [R0], #1
    SUBS R3, R3, #'0'

    MLAHS R2, R12, R2, R3
    BHS L2

    ADD R1, R2, R1, LSL #8
    CMP R3, #-'0'

    BNE L1

    MOV R0, R1

    BX LR