/****************************************************************************
- * Copyright (c) 1998-2008,2009 Free Software Foundation, Inc. *
+ * Copyright 2020 Thomas E. Dickey *
+ * Copyright 1998-2011,2012 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
#include <curses.priv.h>
-MODULE_ID("$Id: lib_ungetch.c,v 1.13 2009/04/18 20:30:12 tom Exp $")
+MODULE_ID("$Id: lib_ungetch.c,v 1.17 2020/02/02 23:34:34 tom Exp $")
#include <fifo_defs.h>
{
int rc = ERR;
- T((T_CALLED("ungetch(%p,%s)"), sp, _nc_tracechar(sp, ch)));
+ T((T_CALLED("ungetch(%p,%s)"), (void *) sp, _nc_tracechar(sp, ch)));
- if (tail != -1) {
- if (head == -1) {
+ if (sp != 0 && tail >= 0) {
+ if (head < 0) {
head = 0;
t_inc();
peek = tail; /* no raw keys */
- } else
+ } else {
h_dec();
+ }
sp->_fifo[head] = ch;
T(("ungetch %s ok", _nc_tracechar(sp, ch)));