mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-04 20:54:21 +03:00
61 lines
1.0 KiB
C
61 lines
1.0 KiB
C
/* j/1/sub.c
|
|
**
|
|
** This file is in the public domain.
|
|
*/
|
|
#include "all.h"
|
|
|
|
|
|
/* functions
|
|
*/
|
|
u3_noun
|
|
u3_cqa_sub(u3_atom a, u3_atom b)
|
|
{
|
|
if ( u3_so(u3_co_is_cat(a)) && u3_so(u3_co_is_cat(b)) ) {
|
|
if ( a < b ) {
|
|
return u3_cm_error("subtract-underflow");
|
|
}
|
|
else return (a - b);
|
|
}
|
|
else {
|
|
mpz_t a_mp, b_mp;
|
|
|
|
u3_cr_mp(a_mp, a);
|
|
u3_cr_mp(b_mp, b);
|
|
|
|
if ( mpz_cmp(a_mp, b_mp) < 0 ) {
|
|
mpz_clear(a_mp);
|
|
mpz_clear(b_mp);
|
|
|
|
return u3_cm_error("subtract-underflow");
|
|
}
|
|
mpz_sub(a_mp, a_mp, b_mp);
|
|
mpz_clear(b_mp);
|
|
|
|
return u3_ci_mp(a_mp);
|
|
}
|
|
}
|
|
|
|
u3_noun
|
|
u3_cwa_sub(u3_noun cor)
|
|
{
|
|
u3_noun a, b;
|
|
|
|
if ( (u3_no == u3_cr_mean(cor, u3_cv_sam_2, &a, u3_cv_sam_3, &b, 0)) ||
|
|
(u3_no == u3ud(a)) ||
|
|
(u3_no == u3ud(b)) )
|
|
{
|
|
return u3_cm_bail(c3__exit);
|
|
} else {
|
|
return u3_cqa_sub(a, b);
|
|
}
|
|
}
|
|
|
|
u3_noun
|
|
u3_cka_sub(u3_noun a, u3_noun b)
|
|
{
|
|
u3_noun c = u3_cqa_sub(a, b);
|
|
|
|
u3z(a); u3z(b);
|
|
return c;
|
|
}
|