Assembly language : try to understand a small function

for my work, I need to reverse what this portion of code (ARM9) is doing. Im a java developper & I really don't understand this portion of code related to a single function.

Of course I'm asking help because the original code is not more available. Anyone can help me to know what this code is doing with a smal algorithm in any high language? It would be nice. I have tried for many hours without results.

sub_FFFF7B38
    PUSH    {LR}
    ADDS    R2, R0, #0
    LDRB    R3, [R2]
    CMP     R3, #0
    BEQ     loc_FFFF7B52
    SUBS    R1, #1
    BCC     loc_FFFF7B52

loc_FFFF7B46:
    ADDS    R0, #1
    LDRB    R3, [R0]
    CMP     R3, #0
    BEQ     loc_FFFF7B52
    SUBS    R1, #1
    BCS     loc_FFFF7B46

loc_FFFF7B52:
    SUBS    R0, R0, R2
    POP     {R1}