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urbit/gen164/3/can.c
2014-01-06 12:37:42 -08:00

96 lines
2.4 KiB
C

/* j/3/can.c
**
** This file is in the public domain.
*/
#include "all.h"
#include "../pit.h"
/* functions
*/
u2_noun // transfer
j2_mbc(Pt3, can)(u2_wire wir_r,
u2_atom a, // retain
u2_noun b) // retain
{
if ( !u2_fly_is_cat(a) || (a >= 32) ) {
return u2_bl_bail(wir_r, c3__fail);
}
else {
c3_g a_g = a;
c3_w tot_w = 0;
u2_ray sal_r;
/* Measure and validate the slab required.
*/
{
u2_noun cab = b;
while ( 1 ) {
u2_noun i_cab, pi_cab, qi_cab;
if ( _0 == cab ) {
break;
}
if ( (u2_no == u2_dust(cab)) ||
(u2_no == u2_dust(i_cab = u2_h(cab))) ||
!(u2_fly_is_cat(pi_cab = u2_h(i_cab))) ||
u2_no == u2_stud(qi_cab = u2_t(i_cab)) )
{
return u2_bl_bail(wir_r, c3__fail);
}
else if ( (tot_w + pi_cab) < tot_w ) {
return u2_bl_bail(wir_r, c3__fail);
}
tot_w += pi_cab;
cab = u2_t(cab);
}
if ( 0 == tot_w ) {
return _0;
}
if ( 0 == (sal_r = u2_rl_slaq(wir_r, a_g, tot_w)) ) {
return u2_bl_bail(wir_r, c3__fail);
}
}
/* Chop the list atoms in.
*/
{
u2_noun cab = b;
c3_w pos_w = 0;
while ( _0 != cab ) {
u2_noun i_cab = u2_h(cab);
u2_atom pi_cab = u2_h(i_cab);
u2_atom qi_cab = u2_t(i_cab);
u2_chop(a_g, 0, pi_cab, pos_w, sal_r, qi_cab);
pos_w += pi_cab;
cab = u2_t(cab);
}
}
return u2_rl_malt(wir_r, sal_r);
}
}
u2_weak // transfer
j2_mb(Pt3, can)(u2_wire wir_r,
u2_noun cor) // retain
{
u2_noun a, b;
if ( (u2_no == u2_mean(cor, u2_cv_sam_2, &a, u2_cv_sam_3, &b, 0)) ||
(u2_no == u2_stud(a)) )
{
return u2_bl_bail(wir_r, c3__fail);
} else {
return j2_mbc(Pt3, can)(wir_r, a, b);
}
}
/* structures
*/
u2_ho_jet
j2_mbj(Pt3, can)[] = {
{ ".2", c3__hevy, j2_mb(Pt3, can), Tier3, u2_none, u2_none },
{ }
};