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/// @file
#include "jets/k.h"
#include "jets/q.h"
#include "jets/w.h"
#include "noun.h"
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)) )
{
return u3m_bail(c3__fail);
}
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;
}
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