mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-24 07:26:51 +03:00
48 lines
670 B
C
48 lines
670 B
C
/* j/1/dec.c
|
|
**
|
|
*/
|
|
#include "all.h"
|
|
|
|
|
|
/* functions
|
|
*/
|
|
u3_noun
|
|
u3qa_inc(u3_atom a)
|
|
{
|
|
return u3i_vint(u3k(a));
|
|
}
|
|
|
|
u3_noun
|
|
u3qa_dec(u3_atom a)
|
|
{
|
|
if ( 0 == a ) {
|
|
return u3m_error("decrement-underflow");
|
|
}
|
|
else {
|
|
if ( _(u3a_is_cat(a)) ) {
|
|
return a - 1;
|
|
}
|
|
else {
|
|
mpz_t a_mp;
|
|
|
|
u3r_mp(a_mp, a);
|
|
mpz_sub_ui(a_mp, a_mp, 1);
|
|
|
|
return u3i_mp(a_mp);
|
|
}
|
|
}
|
|
}
|
|
u3_noun
|
|
u3wa_dec(u3_noun cor)
|
|
{
|
|
u3_noun a;
|
|
|
|
if ( (u3_none == (a = u3r_at(u3x_sam, cor))) ||
|
|
(c3n == u3ud(a)) )
|
|
{
|
|
return u3m_bail(c3__exit);
|
|
} else {
|
|
return u3qa_dec(a);
|
|
}
|
|
}
|