get_arc
if ((get_arc() < 0) || ((*frmt->options)() < 0) ||
static int get_arc(void);
if (get_arc() < 0)
if ((get_arc() < 0) || ((*frmt->options)() < 0) ||
if (!get_arc(&p, end, &arc1) || !get_arc(&p, end, &arc2))
while (get_arc(&p, end, &arc))
while (get_arc(&p, end, &arc))