ksh_twalk
for (ksh_twalk(&ts, t); (ap = tnext(&ts)); ) {
for (ksh_twalk(&ts, tp); (te = tnext(&ts)); ) {
for (ksh_twalk(&ts, &taliases); (tp = tnext(&ts)) != NULL; )
void ksh_twalk ARGS((struct tstate *, struct table *));
ksh_twalk(&ts, tp);