NAME
        Fault -- Returns the text associated with a DOS error code (V36)

   SYNOPSIS
        len = Fault(code, header, buffer, len)
        D0           D1     D2      D3    D4

        long fault(long, strptr, strptr, long)

   FUNCTION
        This routine obtains the error message text for the given error code.
        The header is prepended to the text of the error message, followed
        by a colon.  Puts a null-terminated string for the error message into
        the buffer.  By convention, error messages should be no longer than 80
        characters (+1 for termination), and preferably no more than 60.
        The value returned by ioerr() is set to the code passed in.  if there
        is no message for the error code, the message will be "Error code
        <number>n".

        The number of characters put into the buffer is returned, which will
        be 0 if the code passed in was 0.

   INPUTS
        code   - Error code
        header - header to output before error text
        buffer - Buffer to receive error message.
        len    - Length of the buffer.

   RESULT
        len    - number of characters put into buffer (may be 0)

   SEE ALSO
        ioerr(), setioerr(), printfault()

   BUGS
        In older documentation, the return was shown as bool success.  this
        was incorrect, it has always returned the length.