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56 lines
1.0 KiB
C
56 lines
1.0 KiB
C
/* j/2/skid.c
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**
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*/
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#include "all.h"
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static u3_noun
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_skid_in(u3j_site* sit_u, u3_noun a)
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{
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if ( 0 == a ) {
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return u3nc(u3_nul, u3_nul);
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}
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else if ( c3n == u3du(a) ) {
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return u3m_bail(c3__exit);
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} else {
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u3_noun acc = _skid_in(sit_u, u3t(a));
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u3_noun hoz = u3j_gate_slam(sit_u, u3k(u3h(a)));
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u3_noun nex;
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if ( c3y == hoz ) {
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nex = u3nc(u3nc(u3k(u3h(a)), u3k(u3h(acc))), u3k(u3t(acc)));
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}
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else {
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nex = u3nc(u3k(u3h(acc)), u3nc(u3k(u3h(a)), u3k(u3t(acc))));
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}
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u3z(hoz);
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u3z(acc);
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return nex;
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}
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}
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/* functions
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*/
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u3_noun
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u3qb_skid(u3_noun a,
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u3_noun b)
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{
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u3_noun pro;
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u3j_site sit_u;
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u3j_gate_prep(&sit_u, b);
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pro = _skid_in(&sit_u, a);
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u3j_gate_lose(&sit_u);
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return pro;
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}
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u3_noun
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u3wb_skid(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_2, &a, u3x_sam_3, &b, 0) ) {
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return u3m_bail(c3__exit);
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} else {
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return u3qb_skid(a, b);
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}
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}
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