safe_ungetch(SCREEN *sp, int ch)
{
int rc = ERR;
T((T_CALLED("ungetch(%p,%s)"), (void *) sp, _nc_tracechar(sp, ch)));
if (tail != -1) {
if (head == -1) {
head = 0;
t_inc();
peek = tail; /* no raw keys */
} else
h_dec();
sp->_fifo[head] = ch;
T(("ungetch %s ok", _nc_tracechar(sp, ch)));
#ifdef TRACE
if (USE_TRACEF(TRACE_IEVENT)) {
_nc_fifo_dump(sp);
_nc_unlock_global(tracef);
}
#endif
rc = OK;
}
returnCode(rc);
}
int ungetch(int ch)
{
if (tail == -1)
return ERR;
if (head == -1) {
head = 0;
t_inc()
peek = tail; /* no raw keys */
} else
h_dec();
SP->_fifo[head] = ch;
T(("ungetch %#x ok", ch));
#ifdef TRACE
if (_nc_tracing & TRACE_IEVENT) _nc_fifo_dump();
#endif
return OK;
}