shrub/j/2/scag.c

/* j/2/scag.c
**
** This file is in the public domain.
*/
#include "all.h"


/* functions
*/
  u2_noun
  u2_cqb_scag(
                    u2_atom a,
                    u2_noun b)
  {
    if ( u2_ne(u2_co_is_cat(a)) ) {
      return u2_cm_bail(c3__fail);
    }
    else {
      u2_noun acc;
      c3_w i_w = a;

      if ( !i_w )
	return u2_nul;

      while ( i_w ) {
        if ( u2_no == u2du(b) ) {
          return u2_nul;
        }
	acc = u2_ci_cell( u2h(b), acc );
	b = u2t(b);
	i_w--;
      }

      return u2_ckb_flop(acc);
    }
  }

  u2_noun
  u2_cwb_scag(
                   u2_noun cor)
  {
    u2_noun a, b;

    if ( (u2_no == u2_cr_mean(cor, u2_cv_sam_2, &a, u2_cv_sam_3, &b, 0)) ||
         (u2_no == u2ud(a)) )
    {
      return u2_cm_bail(c3__exit);
    } else {
      return u2_cqb_scag(a, b);
    }
  }