Add cmSystemTools::TrimWhitespace function

Source/cmSystemTools.cxx

@@ -196,6 +196,20 @@ std::string cmSystemTools::EscapeQuotes(const char* str)
   return result;
 }
 
+std::string cmSystemTools::TrimWhitespace(const std::string& s)
+{
+  std::string::const_iterator start = s.begin();
+  while(start != s.end() && *start == ' ')
+    ++start;
+  if (start == s.end())
+    return "";
+
+  std::string::const_iterator stop = s.end()-1;
+  while(*stop == ' ')
+    --stop;
+  return std::string(start, stop+1);
+}
+
 void cmSystemTools::Error(const char* m1, const char* m2,
                           const char* m3, const char* m4)
 {

Source/cmSystemTools.h

@@ -49,6 +49,11 @@ public:
   ///! Escape quotes in a string.
   static std::string EscapeQuotes(const char* str);
 
+  /**
+   * Returns a string that has whitespace removed from the start and the end.
+   */
+  static std::string TrimWhitespace(const std::string& s);
+
   typedef  void (*ErrorCallback)(const char*, const char*, bool&, void*);
   /**
    *  Set the function used by GUI's to display error messages