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75 lines
1.3 KiB
C
75 lines
1.3 KiB
C
/* j/4/by_get.c
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**
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*/
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#include "all.h"
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/* functions
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*/
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u3_noun
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u3qdb_get(u3_noun a, u3_noun b)
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{
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if ( u3_nul == a ) {
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return u3_nul;
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}
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else {
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u3_noun l_a, n_a, r_a;
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u3_noun pn_a, qn_a;
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if ( (c3n == u3r_trel(a, &n_a, &l_a, &r_a)) ||
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(c3n == u3r_cell(n_a, &pn_a, &qn_a) ) )
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{
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return u3m_bail(c3__exit);
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}
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else {
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if ( (c3y == u3r_sing(b, pn_a)) ) {
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return u3nc(u3_nul, u3k(qn_a));
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}
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else {
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if ( c3y == u3qc_gor(b, pn_a) ) {
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return u3qdb_get(l_a, b);
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}
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else return u3qdb_get(r_a, b);
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}
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}
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}
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}
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u3_noun
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u3wdb_get(u3_noun cor)
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{
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u3_noun a, b;
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if ( c3n == u3r_mean(cor, u3x_sam, &b, u3x_con_sam, &a, 0) ) {
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return u3m_bail(c3__exit);
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} else {
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return u3qdb_get(a, b);
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}
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}
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u3_weak
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u3kdb_get(u3_noun a, u3_noun b)
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{
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u3_noun c = u3qdb_get(a, b);
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u3z(a); u3z(b);
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if ( c3n == u3r_du(c) ) {
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u3z(c);
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return u3_none;
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} else {
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u3_noun pro = u3k(u3t(c));
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u3z(c);
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return pro;
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}
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}
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u3_noun
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u3kdb_got(u3_noun a, u3_noun b)
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{
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u3_weak c = u3kdb_get(a, b);
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if ( u3_none == c ) {
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return u3m_bail(c3__exit);
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}
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else return c;
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}
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