1 files changed, 88 insertions, 0 deletions
diff --git a/vere/pkg/noun/jets/c/rap.c b/vere/pkg/noun/jets/c/rap.c
new file mode 100644
index 0000000..4c95693
--- /dev/null
+++ b/vere/pkg/noun/jets/c/rap.c
@@ -0,0 +1,88 @@
+/// @file
+
+#include "jets/q.h"
+#include "jets/w.h"
+
+#include "noun.h"
+
+
+  u3_noun
+  u3qc_rap(u3_atom a,
+           u3_noun b)
+  {
+    if ( !_(u3a_is_cat(a)) || (a >= 32) ) {
+      return u3m_bail(c3__fail);
+    }
+    else {
+      c3_g       a_g = a;
+      c3_w     tot_w = 0;
+      u3i_slab sab_u;
+
+      /* Measure and validate the slab required.
+      */
+      {
+        u3_noun cab = b;
+
+        while ( 1 ) {
+          u3_noun h_cab;
+          c3_w    len_w;
+
+          if ( 0 == cab ) {
+            break;
+          }
+          else if ( c3n == u3du(cab) ) {
+            return u3m_bail(c3__exit);
+          }
+          else if ( c3n == u3ud(h_cab = u3h(cab)) ) {
+            return u3m_bail(c3__exit);
+          }
+          else if ( (tot_w + (len_w = u3r_met(a_g, h_cab))) < tot_w ) {
+            return u3m_bail(c3__fail);
+          }
+          tot_w += len_w;
+          cab = u3t(cab);
+        }
+
+        if ( 0 == tot_w ) {
+          return 0;
+        }
+
+        u3i_slab_init(&sab_u, a_g, tot_w);
+      }
+
+      /* Chop the list atoms in.
+      */
+      {
+        u3_noun cab = b;
+        c3_w  pos_w = 0;
+
+        while ( 0 != cab ) {
+          u3_noun h_cab = u3h(cab);
+          c3_w    len_w = u3r_met(a_g, h_cab);
+
+          u3r_chop(a_g, 0, len_w, pos_w, sab_u.buf_w, h_cab);
+          pos_w += len_w;
+          cab = u3t(cab);
+        }
+      }
+
+      return u3i_slab_mint(&sab_u);
+    }
+  }
+  u3_noun
+  u3wc_rap(u3_noun cor)
+  {
+    u3_noun a, b;
+
+    if ( (c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0)) ||
+         (c3n == u3ud(a)) )
+    {
+      return u3m_bail(c3__exit);
+    } else {
+      u3_noun pro;
+
+      pro = u3qc_rap(a, b);
+      return pro;
+    }
+  }
+