Fix case when target is not a symlink

realpath.sh

@@ -4,6 +4,7 @@ target=$(readlink "$p")
 
 case "$target" in
 /*) p="$target";;
+'') ;;
 *) p="${p%/*}/$target";;
 esac
 

test.sh

@@ -10,7 +10,11 @@ do_test() {
   */*) mkdir -p "${name%/*}";;
   esac
 
-  ln -s "$target" "$name"
+  if [ -n "$target" ]; then
+    ln -s "$target" "$name"
+  else
+    touch "$name"
+  fi
 
   is=$($bin "$name")
 
@@ -31,5 +35,6 @@ do_test 1 a /bin
 do_test 2 a/b .
 do_test 3 a/b ..
 do_test 4 a/b ../t
+do_test 5 a
 
 rm -rf "$dir"