Cycle through commandline arguments in Arm Assembler

Question

I have a program which can read the first argument (after program name) and print it. But how do I access the next argument in the list, and subsequent ones?

main:
        push {r4,r9, ip, lr}
        ldr r4, [r1, #4] // comes in as r1, need to save the location into R4                                                                                                                                                                 

        mov r1, r4
        ldr r0, =stringS
        bl printf
        mov r0, #0

// Tried various combinations trying to find how to move argv[x] to next location #4 bytes along
        //mov r1, r4                                                                                                                                                                                                                          
        //str r1, [r4, #8]                                                                                                                                                                                                                    
        ldr r1, [r4], #8
        ldr r0, =stringS
        bl printf

        mov r0, #0      // return 0                                                                                                                                                                                                           
        pop {r4, ip, pc}

What seemed like a trivial program seems to be kicking me in the teeth!