From 9c79e41fc5f5cb76b89af040b1675896d57051d9 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Tue, 9 Apr 2013 22:21:08 +0200
Subject: [PATCH] Fix do_strip(): don't call PyUnicode_READ() in
 Py_UNICODE_ISSPACE() to not call it twice

---
 Objects/unicodeobject.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index ba72dba3bed..52fe3bc55c7 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -11727,16 +11727,23 @@ do_strip(PyObject *self, int striptype)
 
     i = 0;
     if (striptype != RIGHTSTRIP) {
-        while (i < len && Py_UNICODE_ISSPACE(PyUnicode_READ(kind, data, i))) {
+        while (i < len) {
+            Py_UCS4 ch = PyUnicode_READ(kind, data, i);
+            if (!Py_UNICODE_ISSPACE(ch))
+                break;
             i++;
         }
     }
 
     j = len;
     if (striptype != LEFTSTRIP) {
-        do {
+        j--;
+        while (j >= i) {
+            Py_UCS4 ch = PyUnicode_READ(kind, data, j);
+            if (!Py_UNICODE_ISSPACE(ch))
+                break;
             j--;
-        } while (j >= i && Py_UNICODE_ISSPACE(PyUnicode_READ(kind, data, j)));
+        }
         j++;
     }