NAME
        ArgString -- return a string pointer from a ToolTypes array. (V36)

   SYNOPSIS
        string = ArgString(tt,entry,defaultstring)

        strptr argstring(ubyte **,strptr,strptr);

   FUNCTION
        This function looks in the ToolTypes array 'tt' returned
        by argarrayinit() for 'entry' and returns the value associated
        with it. 'tt' is in standard ToolTypes format such as:

                ENTRY=Value

        This function returns a pointer to the Value string.

        If 'entry' is not found, 'defaultstring' is returned.

   INPUTS
        tt - a ToolTypes array as returned by argarrayinit()
        entry - the entry in the ToolTypes array to search for
        defaultstring - the value to return in case 'entry' is not found within
                        the ToolTypes array

   RESULTS
        value - the value associated with 'entry', or defaultstring if 'entry'
                is not in the ToolTypes array

   SEE ALSO
        argarrayinit()