tai_sub - subtract two struct tai

tai_sub subtracts b from a and writes the result to t.  The inputs and output may overlap.

       tai_sub - subtract two struct tai

taia_sub(3), tai_add(3)

                                                                                                      tai_sub(3)

#include<libowfat/tai.h>

       extern int tai_sub(struct tai* t,const struct tai* a,
                          const struct tai* b);