diff --git a/realpath.sh b/realpath.sh
index df2944b..fe018dd 100755
--- a/realpath.sh
+++ b/realpath.sh
@@ -1,44 +1,42 @@
 #!/bin/sh
-p="${1%/}"
 
 case "$1" in
-  /*) p="${1#/}"
-      r="";;
-  *) p="${PWD#/}/$1";;
+  /*) left="${1#/}";;
+  *) left="${PWD#/}/$1";;
 esac
 
-r=""
+result=""
 
-while [ -n "$p" ]; do
-  case "$p" in
+while [ -n "$left" ]; do
+  case "$left" in
   */*)
-    seg="${p%%/*}"
-    p="${p#*/}"
+    seg="${left%%/*}"
+    left="${left#*/}"
     ;;
   *)
-    seg="$p"
-    p=""
+    seg="$left"
+    left=""
     ;;
   esac
   case "$seg" in
   .)
-    r="${r%/*}"
+    result="${result%/*}"
     continue
     ;;
   ..)
-    r="${r%/*/*}"
+    result="${result%/*/*}"
     continue
     ;;
   esac
-  r="$r/$seg"
-  target="$(readlink "$r")"
+  result="$result/$seg"
+  target="$(readlink "$result")"
   case "$target" in
-    /*) p="${target}"
-        r="";;
+    /*) left="${target}"
+        result="";;
     '') ;;
-    *) p="${p%/*}/${target}";;
+    *) left="${left%/*}/${target}";;
   esac
-  p="${p#/}"
+  left="${left#/}"
 done
 
-echo "$r"
+echo "$result"