From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 20 Apr 2011 08:38:11 +0000 (-0700)
Subject: * textprop.c (set_text_properties_1): Rewrite for clarity,
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* textprop.c (set_text_properties_1): Rewrite for clarity,

and to avoid GCC warning about integer overflow.
---

diff --git a/src/ChangeLog b/src/ChangeLog
index a9a192735bd..e372a7a7fc2 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,8 @@
 2011-04-20  Paul Eggert  <eggert@cs.ucla.edu>
 
+	* textprop.c (set_text_properties_1): Rewrite for clarity,
+	and to avoid GCC warning about integer overflow.
+
 	* intervals.h (struct interval): Use EMACS_INT for members
 	where EMACS_UINT might cause problems.  See
 	<http://lists.gnu.org/archive/html/emacs-devel/2011-04/msg00514.html>.
diff --git a/src/textprop.c b/src/textprop.c
index d9da36bf36b..64265fd679c 100644
--- a/src/textprop.c
+++ b/src/textprop.c
@@ -1348,15 +1348,18 @@ set_text_properties_1 (Lisp_Object start, Lisp_Object end, Lisp_Object propertie
   register EMACS_INT s, len;
   INTERVAL unchanged;
 
-  s = XINT (start);
-  len = XINT (end) - s;
-  if (len == 0)
-    return;
-  if (len < 0)
+  if (XINT (start) < XINT (end))
     {
-      s = s + len;
-      len = - len;
+      s = XINT (start);
+      len = XINT (end) - s;
     }
+  else if (XINT (end) < XINT (start))
+    {
+      s = XINT (end);
+      len = XINT (start) - s;
+    }
+  else
+    return;
 
   if (i == 0)
     i = find_interval (BUF_INTERVALS (XBUFFER (buffer)), s);