5613 odd ls -U behaviour if output is not a terminal

*** 20,29 ****
--- 20,30 ----
   */
  
  /*
   * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+  * Copyright 2015 Gary Mills
   */
  
  /*
   * Copyright 2009 Jason King.  All rights reserved.
   * Use is subject to license terms.
*** 1258,1268 ****
          char *dmark = "";       /* Used if -p or -F option active */
          char *cp;
          char *str;
  
          if (noflist) {
!                 (void) printf("%s\n", ap->ln.lname);
                  return;
          }
  
          p = ap;
          column();
--- 1259,1270 ----
          char *dmark = "";       /* Used if -p or -F option active */
          char *cp;
          char *str;
  
          if (noflist) {
!                 (void) printf("%s\n", (ap->lflags & ISARG) ? ap->ln.namep :
!                     ap->ln.lname);
                  return;
          }
  
          p = ap;
          column();
*** 1809,1842 ****
                  maxn = nfiles;
          } else {
                  rep = flist[nfiles++];
          }
  
          /*
           * When noflist is set, none of the extra information about the dirent
!          * will be printed, so omit initialization of this lbuf as well as the
!          * stat(2) call.
           */
          if (!argfl && noflist)
                  return (rep);
  
!         /* Initialize */
  
-         rep->lflags = (mode_t)0;
-         rep->flinkto = NULL;
-         rep->cycle = 0;
          rep->lat.tv_sec = time(NULL);
-         rep->lat.tv_nsec = 0;
          rep->lct.tv_sec = time(NULL);
-         rep->lct.tv_nsec = 0;
          rep->lmt.tv_sec = time(NULL);
-         rep->lmt.tv_nsec = 0;
-         rep->aclp = NULL;
-         rep->exttr = NULL;
-         rep->extm = NULL;
-         rep->color = NULL;
-         rep->link_color = NULL;
  
          if (argfl || statreq) {
                  int doacl;
  
                  if (lflg)
--- 1811,1836 ----
                  maxn = nfiles;
          } else {
                  rep = flist[nfiles++];
          }
  
+         /* Clear the lbuf */
+         (void) memset((void *) rep, 0, sizeof (struct lbuf));
+ 
          /*
           * When noflist is set, none of the extra information about the dirent
!          * will be printed, so omit remaining initialization of this lbuf
!          * as well as the  stat(2) call.
           */
          if (!argfl && noflist)
                  return (rep);
  
!         /* Initialize non-zero members */
  
          rep->lat.tv_sec = time(NULL);
          rep->lct.tv_sec = time(NULL);
          rep->lmt.tv_sec = time(NULL);
  
          if (argfl || statreq) {
                  int doacl;
  
                  if (lflg)