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/* LibTomMath, multiple-precision integer library -- Tom St Denis
* LibTomMath is library that provides for multiple-precision
* integer arithmetic as well as number theoretic functionality.
* The library is designed directly after the MPI library by
* Michael Fromberger but has been written from scratch with
* additional optimizations in place.
* The library is free for all purposes without any express
* guarantee it works.
* Tom St Denis,,
#include <tommath.h>
/* single digit subtraction */
mp_sub_d (mp_int * a, mp_digit b, mp_int * c)
mp_int t;
int res;
if ((res = mp_init (&t)) != MP_OKAY) {
return res;
mp_set (&t, b);
res = mp_sub (a, &t, c);
mp_clear (&t);
return res;
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