OpenSim.Region.ScriptEngine.Shared.Api.LSL_Api.llGetSubString C# (CSharp) Method

        public LSL_String llGetSubString(string src, int start, int end)
        {
            m_host.AddScriptLPS(1);

            // Normalize indices (if negative).
            // After normlaization they may still be
            // negative, but that is now relative to
            // the start, rather than the end, of the
            // sequence.

            if (start < 0)
            {
                start = src.Length+start;
            }
            if (end < 0)
            {
                end = src.Length+end;
            }

            // Conventional substring
            if (start <= end)
            {
                // Implies both bounds are out-of-range.
                if (end < 0 || start >= src.Length)
                {
                    return String.Empty;
                }
                // If end is positive, then it directly
                // corresponds to the lengt of the substring
                // needed (plus one of course). BUT, it
                // must be within bounds.
                if (end >= src.Length)
                {
                    end = src.Length-1;
                }

                if (start < 0)
                {
                    return src.Substring(0,end+1);
                }
                // Both indices are positive
                return src.Substring(start, (end+1) - start);
            }

            // Inverted substring (end < start)
            else
            {
                // Implies both indices are below the
                // lower bound. In the inverted case, that
                // means the entire string will be returned
                // unchanged.
                if (start < 0)
                {
                    return src;
                }
                // If both indices are greater than the upper
                // bound the result may seem initially counter
                // intuitive.
                if (end >= src.Length)
                {
                    return src;
                }

                if (end < 0)
                {
                    if (start < src.Length)
                    {
                        return src.Substring(start);
                    }
                    else
                    {
                        return String.Empty;
                    }
                }
                else
                {
                    if (start < src.Length)
                    {
                        return src.Substring(0,end+1) + src.Substring(start);
                    }
                    else
                    {
                        return src.Substring(0,end+1);
                    }
                }
            }
         }