tai_add - add two struct tai

tai_add adds a to b and writes the result to t.  The inputs and output may overlap.

       tai_add - add two struct tai

taia_add(3), tai_sub(3)

                                                                                                      tai_add(3)

#include<libowfat/tai.h>

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