shrub/jets/a/sub.c

65 lines
1.0 KiB
C

/* j/1/sub.c
**
*/
#include "all.h"
/* functions
*/
u3_noun
u3qa_sub(u3_atom a,
u3_atom b)
{
if ( _(u3a_is_cat(a)) && _(u3a_is_cat(b)) ) {
if ( a < b ) {
return u3m_error("subtract-underflow");
}
else return (a - b);
}
else if ( 0 == b ) {
return u3k(a);
}
else {
mpz_t a_mp, b_mp;
u3r_mp(a_mp, a);
u3r_mp(b_mp, b);
if ( mpz_cmp(a_mp, b_mp) < 0 ) {
mpz_clear(a_mp);
mpz_clear(b_mp);
return u3m_error("subtract-underflow");
}
mpz_sub(a_mp, a_mp, b_mp);
mpz_clear(b_mp);
return u3i_mp(a_mp);
}
}
u3_noun
u3wa_sub(u3_noun cor)
{
u3_noun a, b;
if ( (c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0)) ||
(c3n == u3ud(b)) ||
(c3n == u3ud(a) && b != 0) )
{
return u3m_bail(c3__exit);
} else {
return u3qa_sub(a, b);
}
}
u3_noun
u3ka_sub(u3_noun a,
u3_noun b)
{
u3_noun c = u3qa_sub(a, b);
u3z(a); u3z(b);
return c;
}