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89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
/* j/3/cue.c
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**
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** This file is in the public domain.
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*/
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#include "all.h"
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#include "../pit.h"
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static u2_noun // produce
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_cue_in(u2_ch_root* har_u,
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u2_atom a, // retain
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u2_atom b) // retain
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{
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u2_noun p, q;
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if ( 0 == u2_cqc_cut(0, b, 1, a) ) {
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u2_noun x = u2_cqa_inc(b);
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u2_noun c = u2_cqe_rub(x, a);
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p = u2_cqa_inc(u2k(u2h(c)));
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q = u2k(u2t(c));
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u2_ch_put(har_u, u2k(b), u2k(q));
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u2z(c);
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u2z(x);
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}
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else {
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u2_noun c = u2_cqa_add(2, b);
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u2_noun l = u2_cqa_inc(b);
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if ( 0 == u2_cqc_cut(0, l, 1, a) ) {
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u2_noun u, v, w;
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u2_noun x, y;
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u = _cue_in(har_u, a, c);
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x = u2_cqa_add(u2h(u), c);
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v = _cue_in(har_u, a, x);
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w = u2nc(u2k(u2h(u2t(u))), u2k(u2h(u2t(v))));
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y = u2_cqa_add(u2h(u), u2h(v));
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p = u2_cqa_add(2, y);
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q = w;
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u2_ch_put(har_u, u2k(b), u2k(q));
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u2z(u); u2z(v); u2z(x); u2z(y);
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}
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else {
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u2_noun d = u2_cqe_rub(c, a);
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u2_noun x = u2_ch_get(har_u, u2k(u2t(d)));
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p = u2_cqa_add(2, u2h(d));
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if ( u2_none == x ) {
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return u2_cm_bail(c3__exit);
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}
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q = x;
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u2z(d);
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}
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u2z(l);
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u2z(c);
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}
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return u2nt(p, q, 0);
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}
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u2_noun // transfer
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u2_cqe_cue(u2_atom a) // retain
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{
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u2_ch_root* har_u = u2_ch_new();
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u2_noun x = _cue_in(har_u, a, 0);
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u2_noun y = u2k(u2h(u2t(x)));
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u2_ch_free(har_u);
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u2z(x);
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return y;
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}
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u2_noun // transfer
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u2_cwe_cue(u2_noun cor) // retain
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{
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u2_noun a;
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if ( (u2_none == (a = u2_cr_at(u2_cv_sam, cor))) ) {
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return u2_cm_bail(c3__fail);
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} else {
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return u2_cqe_cue(a);
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}
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}
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