add padding function lpad and rpad to strutils

simgear/misc/strutils.cxx

@@ -183,5 +183,23 @@ namespace simgear {
 	    return do_strip( s, BOTHSTRIP );
 	}
 
+	string 
+	rpad( const string & s, string::size_type length, char c )
+	{
+	    string::size_type l = s.length();
+	    if( l >= length ) return s;
+	    string reply = s;
+	    return reply.append( length-l, c );
+	}
+
+	string 
+	lpad( const string & s, size_t length, char c )
+	{
+	    string::size_type l = s.length();
+	    if( l >= length ) return s;
+	    string reply = s;
+	    return reply.insert( 0, length-l, c );
+	}
+
     } // end namespace strutils
 } // end namespace simgear

simgear/misc/strutils.hxx

@@ -64,6 +64,24 @@ namespace simgear {
 	std::string rstrip( const std::string& s );
 	std::string strip( const std::string& s );
 
+        /**
+         * Right-padding of a string to a given length
+         * @param s String to pad
+         * @param length The total length of the resulting string
+         * @param c The character to pad with
+         * @return The padded string
+         */
+        std::string rpad( const std::string & s, size_t length, char c );
+
+        /**
+         * Left-padding of a string to a given length
+         * @param s String to pad
+         * @param length The total length of the resulting string
+         * @param c The character to pad with
+         * @return The padded string
+         */
+        std::string lpad( const std::string & s, size_t length, char c );
+
 	/**
 	 * Split a string into a words using 'sep' as the delimiter string.
 	 * Produces a result similar to the perl and python functions of the