taia_sub - subtract two struct taia

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

       taia_sub - subtract two struct taia

tai_sub(3), taia_add(3)

                                                                                                     taia_sub(3)

#include<libowfat/taia.h>

       extern int taia_sub(struct taia* t,const struct taia* a,
                          const struct taia* b);