Index: trunk/src/eixTk/compare.h
===================================================================
--- trunk/src/eixTk/compare.h (revision 590)
+++ trunk/src/eixTk/compare.h (revision 730)
@@ -1,3 +1,3 @@
-// vim:set et cinoptions=g0,t0,^-2,(0 sw=4 ts=4:
+// vim:set noet cinoptions=g0,t0,(0 sw=4 ts=4:
 // This file is part of the eix project and distributed under the
 // terms of the GNU General Public License v2.
@@ -5,4 +5,5 @@
 // Copyright (c)
 //   Emil Beinroth <emilbeinroth@gmx.net>
+//   Martin VÀth <vaeth@mathematik.uni-wuerzburg.de>
 
 #ifndef __GUARD__COMPARE_H__
@@ -14,34 +15,40 @@
 namespace eix
 {
-  /// compare two objects.
-  /// @return 0 if equal, 1 if left > right or -1 if left < right.
-  template<typename T>
-      int default_compare(const T& left, const T& right)
-      {
-          if (left == right)
-              return 0;
-          else if(left < right)
-              return -1;
-          else
-              return 1;
-      }
+	/// compare two objects.
+	/// @return 0 if equal, 1 if left > right or -1 if left < right.
+	template<typename T>
+	int default_compare(const T& left, const T& right)
+	{
+		if (left == right)
+			return 0;
+		if(left < right)
+			return -1;
+		return 1;
+	}
 
-  /// numeric comparison.
-  /// @note empty strings count a "0"
-  static inline int
-  numeric_compare(const std::string& left, const std::string& right)
-  {
-      // strip leading 0's
-      const std::string::size_type lstart = left.find_first_not_of('0');
-      const std::string::size_type rstart = right.find_first_not_of('0');
+	/// numeric comparison.
+	/// @note empty strings count a "0"
+	static inline int
+	numeric_compare(const std::string& left, const std::string& right)
+	{
+		// strip leading 0's
+		std::string::size_type lstart = left.find_first_not_of('0');
+		std::string::size_type rstart = right.find_first_not_of('0');
+		// Special cases: number is 0 or string is empty
+		if (lstart == std::string::npos) {
+			if(rstart == std::string::npos)
+				return 0;
+			return -1;
+		}
+		if (rstart == std::string::npos)
+			return 1;
 
-      // check if one is longer, that one would be bigger
-      const int size_result = default_compare(left.size() - (lstart == std::string::npos ? 0 : lstart),
-                                              right.size() - (rstart == std::string::npos ? 0 : rstart));
-      if (size_result)
-          return size_result;
-      // both strings have the same length, do string comparison
-      return left.compare(lstart, std::string::npos, right, rstart, std::string::npos);
-  }
+		// check if one is longer, that one would be bigger
+		int size_result = default_compare(left.size() - lstart, right.size() - rstart);
+		if (size_result)
+			return size_result;
+		// both strings have the same length, do string comparison
+		return left.compare(lstart, std::string::npos, right, rstart, std::string::npos);
+	}
 }