function substr_ch1() //gml_Script_substr_ch1
{
    var str = argument[0]
    var pos = argument[1]
    if (pos < 0)
        pos = strlen_ch1(str) + 1 + pos
    if (argument_count == 2)
        var len = strlen_ch1(str) - pos + 1
    else
        len = argument[2]
    if (len > 0)
        return string_copy(str, pos, len);
    else
        return "";
}