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urbit/gen164/1/dec.c
2014-01-06 12:37:42 -08:00

56 lines
1.3 KiB
C

/* j/1/dec.c
**
** This file is in the public domain.
*/
#include "all.h"
#include "../pit.h"
/* functions
*/
u2_weak // transfer
j2_mbc(Pt1, inc)(u2_wire wir_r,
u2_atom a) // retain
{
return u2_rl_vint(wir_r, u2_rx(wir_r, a));
}
u2_weak // transfer
j2_mbc(Pt1, dec)(u2_wire wir_r,
u2_atom a) // retain
{
if ( _0 == a ) {
return u2_bl_error(wir_r, "decrement-underflow");
return u2_bl_bail(wir_r, c3__exit);
}
else {
mpz_t a_mp;
u2_mp(a_mp, a);
mpz_sub_ui(a_mp, a_mp, 1);
return u2_rl_mp(wir_r, a_mp);
}
}
u2_weak // transfer
j2_mb(Pt1, dec)(u2_wire wir_r,
u2_noun cor) // retain
{
u2_noun a;
if ( (u2_none == (a = u2_frag(u2_cv_sam, cor))) ||
(u2_no == u2_stud(a)) )
{
return u2_bl_bail(wir_r, c3__exit);
} else {
return j2_mbc(Pt1, dec)(wir_r, a);
}
}
/* structures
*/
u2_ho_jet
j2_mbj(Pt1, dec)[] = {
{ ".2", c3__lite, j2_mb(Pt1, dec), u2_jet_live, u2_none, u2_none },
{ }
};