FLOCK(f);
- /* Fail if unreadable or writing and unable to flush */
- if ((f->flags & (F_ERR|F_NORD)) || (f->wpos && __oflow(f))) {
+ if ((!f->rend && __toread(f)) || f->rpos <= f->buf - UNGET) {
FUNLOCK(f);
return EOF;
}
- /* Clear write mode */
- f->wbase = f->wpos = f->wstop = f->wend = 0;
-
- /* Put the file in read mode */
- if (!f->rpos) f->rpos = f->rend = f->buf;
-
- /* If unget buffer is already full, fail. */
- if (f->rpos <= f->buf - UNGET) {
- FUNLOCK(f);
- return EOF;
- }
-
- /* Put a byte back into the buffer */
*--f->rpos = c;
f->flags &= ~F_EOF;