Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

bytes : sxbp_buffer_t
co_ords : sxbp_co_ord_cache_t
collides : sxbp_spiral_t
diagnostic : sxbp_serialise_result_t
direction : sxbp_line_t
height : sxbp_bitmap_t
items : sxbp_co_ord_array_t
length : sxbp_line_t
lines : sxbp_spiral_t
major : sxbp_version_t
minor : sxbp_version_t
patch : sxbp_version_t
pixels : sxbp_bitmap_t
seconds_accuracy : sxbp_spiral_t
seconds_spent : sxbp_spiral_t
size : sxbp_buffer_t , sxbp_co_ord_array_t , sxbp_spiral_t
solved_count : sxbp_spiral_t
status : sxbp_serialise_result_t
string : sxbp_version_t
validity : sxbp_co_ord_cache_t
width : sxbp_bitmap_t
x : sxbp_tuple_t
y : sxbp_tuple_t