#include <stdio_impl.h>

int __toread(FILE* f) {
  f->mode |= f->mode - 1;
  if (f->wpos > f->wbase)
    f->write(f, 0, 0);
  f->wpos = f->wbase = f->wend = 0;
  if (f->flags & F_NORD) {
    f->flags |= F_ERR;
    return EOF;
  }
  f->rpos = f->rend = f->buf + f->buf_size;
  return (f->flags & F_EOF) ? EOF : 0;
}