or... a little different way)
Code:
.text:0000CDE8 BNE loc_CE20
.text:0000CDEC LDRB R3, [R5,#0x84]
.text:0000CDF0 CMP R3, #0
.text:0000CDF4 BNE loc_CE98
.text:0000CDF8 MOV R4, SP
.text:0000CDFC MOV R0, SP ; s
.text:0000CE00 MOV R3, #0x3FC
.text:0000CE04 LDR R1, [R10,R3] ; format
.text:0000CE08 MOV R2, R6
.text:0000CE0C BL .sprintf
...
[UPDATE]
It's possible only because 0x3FC is 1111111100b)