Function ReadAltSampFile 

pub unsafe extern "C" fn ReadAltSampFile(
    arr1: *mut *mut *mut f32,
    arr2: *mut *mut *mut f32,
    infile: *mut c_char,
    linelen: c_long,
    nlines: c_long,
    tileparams: *mut tileparamT,
) -> c_int

Reads file of real alternating floats from separate images. Format is real0A, real0B, real1A, real1B, real2A, real2B,… ncol is the number of samples in each image (note the number of floats per line in the specified file).