help needed on coversin of an char array to an integer

Hi,
Im kinda stuck in a project at a point where i need an array to
be converted to a
integer using some kind of math.
This board does not support functions like scanf, sscanf etc as
it does not have enough memory to hold their stack.

given a string char str[8] = {'0', '0', '0' , '1' , 'f' , 'b' ,
'c' , 'a' };
i need a function which can convert this array to an integer
( 0x0001fbca )

Expecting a quick response.

Thanks
MAx
.

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