#include "internal.h"

rune
io·ungetr(io·Header *io)
{
    if(io->state == io·BufEnd)
        io->state = io·BufRdr;
    if(io->state != io·BufRdr)
        return io·BufEof;
    io->ilen  -= io->runesz;
    io->runesz = 0;
    return 0;
}