/*
    Current implementation only counts the bytes instead of characters.

    @args:
        r1 => pointer to the string
    @returns:
        r0 => string length
    @clobbers:
        r2
*/
strlen:
    mov r0, #0
1:
    ldrb r2, [r1, r0]
    cmp r2, #0
    bxle lr

    add r0, r0, #1
    b 1b

/*
    @input r1, r2 - pointers to the strings to compare
    @return r0 - 0 if equal, -1 if a < b, 1 if a > b
*/
strcmp: @ TODO: implement