1 files changed, 74 insertions, 0 deletions
diff --git a/vere/pkg/noun/jets/d/by_bif.c b/vere/pkg/noun/jets/d/by_bif.c
new file mode 100644
index 0000000..0a2f23a
--- /dev/null
+++ b/vere/pkg/noun/jets/d/by_bif.c
@@ -0,0 +1,74 @@
+/// @file
+
+#include "jets/q.h"
+#include "jets/w.h"
+
+#include "noun.h"
+
+/* internal functions
+*/
+static u3_noun
+_b_bif_putroot(u3_noun a,
+               u3_noun b)
+{
+  if ( u3_nul == a ) {
+    return u3nt(u3k(b), u3_nul, u3_nul);
+  }
+  else {
+    u3_noun n_a, l_a, r_a;
+    u3_noun p_n_a, q_n_a;
+    u3x_trel(a, &n_a, &l_a, &r_a);
+    u3x_cell(n_a, &p_n_a, &q_n_a);
+
+    if ( c3y == u3r_sing(b, p_n_a) ) {
+      return u3nt(u3k(b), u3k(l_a), u3k(r_a));
+    }
+    else {
+      u3_noun c, n_c, l_c, r_c;
+      u3_noun d;
+
+      if ( c3y == u3qc_gor(b, p_n_a) ) {
+        c = _b_bif_putroot(l_a, b);
+        u3r_trel(c, &n_c, &l_c, &r_c);
+        d = u3nt(u3k(n_c),
+                 u3k(l_c),
+                 u3nt(u3k(n_a), u3k(r_c), u3k(r_a))
+                );
+        u3z(c);
+        return d;
+      }
+      else {
+        c = _b_bif_putroot(r_a, b);
+        u3r_trel(c, &n_c, &l_c, &r_c);
+        d = u3nt(u3k(n_c),
+                 u3nt(u3k(n_a), u3k(l_a), u3k(l_c)),
+                 u3k(r_c)
+                );
+        u3z(c);
+        return d;
+      }
+    }
+  }
+}
+
+u3_noun
+u3wdb_bif(u3_noun cor)
+{
+  u3_noun a, b;
+  u3x_mean(cor, u3x_sam, &b, u3x_con_sam, &a, 0);
+  return u3qdb_bif(a, b);
+}
+
+u3_noun
+u3qdb_bif(u3_noun a,
+          u3_noun b)
+{
+  u3_noun c, n_c, l_c, r_c;
+  u3_noun d;
+
+  c = _b_bif_putroot(a, b);
+  u3r_trel(c, &n_c, &l_c, &r_c);
+  d = u3nc(u3k(l_c), u3k(r_c));
+  u3z(c);
+  return d;
+}