No Garbage Text and Numbers.

kosmonautgames · December 10, 2016, 2:30pm

I have modified the appendAt so it will work if the index + length of new string is longer than the given stringbuilder

public void AppendAt(int index, StringBuilder s)
        {
            int len = this.StringBuilder.Length;
            int reqcapacity = (index + s.Length + 1) - this.StringBuilder.Capacity;
            if (reqcapacity > 0)
                this.StringBuilder.Capacity += reqcapacity;

            int initialLength = StringBuilder.Length;
            //If we append near the end we can run out of space in the for loop. Make sure we are large enough
            if (StringBuilder.Length < index + s.Length)
            {
                StringBuilder.Length = index + s.Length;
            }

            //If our appendAt is outside the scope we need to add spaces until then
            if (index > initialLength-1)
            {
                for (int j = initialLength - 1; j < index; j++)
                {
                    StringBuilder[j] = space;
                }
            }

            for (int i = 0; i < s.Length; i++)
            {
                this.StringBuilder[i + index] = (char)(s[i]);
            }
        }