Function xo_is_line_buffered

tools/libxo/libxo/libxo.c:590–601

* We need to decide if stdout is line buffered (_IOLBF). Lacking a * standard way to decide this (e.g. getlinebuf()), we have configure * look to find __flbf, which glibc supported. If not, we'll rely on * isatty, with the assumption that terminals are the only thing * that's line buffered. We _could_ test for "steam._flags & _IOLBF", * which is all __flbf does, but that's even tackier. L

 * something we're willing to do.
 */
static int
xo_is_line_buffered (FILE *stream)
{
#if HAVE___FLBF
    if (__flbf(stream))
	return 1;
#else /* HAVE___FLBF */
    if (isatty(fileno(stream)))
	return 1;
#endif /* HAVE___FLBF */
    return 0;
}

/*
 * Initialize an xo_handle_t, using both static defaults and