diff --git a/ncurses/trace/lib_tracebits.c b/ncurses/trace/lib_tracebits.c
new file mode 100644
index 0000000..cc441b3
--- /dev/null
+++ b/ncurses/trace/lib_tracebits.c
@@ -0,0 +1,266 @@
+/****************************************************************************
+ * Copyright (c) 1998-2007,2008 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            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+/****************************************************************************
+ *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
+ *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
+ *     and: Thomas E. Dickey                        1996-on                 *
+ ****************************************************************************/
+
+#include <curses.priv.h>
+#include <term.h>		/* cur_term */
+
+MODULE_ID("$Id: lib_tracebits.c,v 1.17 2008/08/03 16:09:26 tom Exp $")
+
+#if SVR4_TERMIO && !defined(_POSIX_SOURCE)
+#define _POSIX_SOURCE
+#endif
+
+#if HAVE_SYS_TERMIO_H
+#include <sys/termio.h>		/* needed for ISC */
+#endif
+
+#ifdef __EMX__
+#include <io.h>
+#endif
+
+/* may be undefined if we're using termio.h */
+#ifndef TOSTOP
+#define TOSTOP 0
+#endif
+
+#ifndef IEXTEN
+#define IEXTEN 0
+#endif
+
+#ifndef ONLCR
+#define ONLCR 0
+#endif
+
+#ifndef OCRNL
+#define OCRNL 0
+#endif
+
+#ifndef ONOCR
+#define ONOCR 0
+#endif
+
+#ifndef ONLRET
+#define ONLRET 0
+#endif
+
+#ifdef TRACE
+
+typedef struct {
+    unsigned int val;
+    const char *name;
+} BITNAMES;
+
+static void
+lookup_bits(char *buf, const BITNAMES * table, const char *label, unsigned int val)
+{
+    const BITNAMES *sp;
+
+    (void) strcat(buf, label);
+    (void) strcat(buf, ": {");
+    for (sp = table; sp->name; sp++)
+	if (sp->val != 0
+	    && (val & sp->val) == sp->val) {
+	    (void) strcat(buf, sp->name);
+	    (void) strcat(buf, ", ");
+	}
+    if (buf[strlen(buf) - 2] == ',')
+	buf[strlen(buf) - 2] = '\0';
+    (void) strcat(buf, "} ");
+}
+
+NCURSES_EXPORT(char *)
+_nc_trace_ttymode(TTY * tty)
+/* describe the state of the terminal control bits exactly */
+{
+    char *buf;
+
+#ifdef TERMIOS
+    static const BITNAMES iflags[] =
+    {
+	{BRKINT, "BRKINT"},
+	{IGNBRK, "IGNBRK"},
+	{IGNPAR, "IGNPAR"},
+	{PARMRK, "PARMRK"},
+	{INPCK, "INPCK"},
+	{ISTRIP, "ISTRIP"},
+	{INLCR, "INLCR"},
+	{IGNCR, "IGNC"},
+	{ICRNL, "ICRNL"},
+	{IXON, "IXON"},
+	{IXOFF, "IXOFF"},
+	{0, NULL}
+#define ALLIN	(BRKINT|IGNBRK|IGNPAR|PARMRK|INPCK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IXOFF)
+    }, oflags[] =
+    {
+	{OPOST, "OPOST"},
+	{OFLAGS_TABS, "XTABS"},
+	{ONLCR, "ONLCR"},
+	{OCRNL, "OCRNL"},
+	{ONOCR, "ONOCR"},
+	{ONLRET, "ONLRET"},
+	{0, NULL}
+#define ALLOUT	(OPOST|OFLAGS_TABS|ONLCR|OCRNL|ONOCR|ONLRET)
+    }, cflags[] =
+    {
+	{CLOCAL, "CLOCAL"},
+	{CREAD, "CREAD"},
+	{CSTOPB, "CSTOPB"},
+#if !defined(CS5) || !defined(CS8)
+	{CSIZE, "CSIZE"},
+#endif
+	{HUPCL, "HUPCL"},
+	{PARENB, "PARENB"},
+	{PARODD | PARENB, "PARODD"},	/* concession to readability */
+	{0, NULL}
+#define ALLCTRL	(CLOCAL|CREAD|CSIZE|CSTOPB|HUPCL|PARENB|PARODD)
+    }, lflags[] =
+    {
+	{ECHO, "ECHO"},
+	{ECHOE | ECHO, "ECHOE"},	/* concession to readability */
+	{ECHOK | ECHO, "ECHOK"},	/* concession to readability */
+	{ECHONL, "ECHONL"},
+	{ICANON, "ICANON"},
+	{ISIG, "ISIG"},
+	{NOFLSH, "NOFLSH"},
+	{TOSTOP, "TOSTOP"},
+	{IEXTEN, "IEXTEN"},
+	{0, NULL}
+#define ALLLOCAL	(ECHO|ECHONL|ICANON|ISIG|NOFLSH|TOSTOP|IEXTEN)
+    };
+
+    buf = _nc_trace_buf(0,
+			8 + sizeof(iflags) +
+			8 + sizeof(oflags) +
+			8 + sizeof(cflags) +
+			8 + sizeof(lflags) +
+			8);
+    if (buf != 0) {
+
+	if (tty->c_iflag & ALLIN)
+	    lookup_bits(buf, iflags, "iflags", tty->c_iflag);
+
+	if (tty->c_oflag & ALLOUT)
+	    lookup_bits(buf, oflags, "oflags", tty->c_oflag);
+
+	if (tty->c_cflag & ALLCTRL)
+	    lookup_bits(buf, cflags, "cflags", tty->c_cflag);
+
+#if defined(CS5) && defined(CS8)
+	{
+	    static struct {
+		int value;
+		const char *name;
+	    } csizes[] = {
+#define CS_DATA(name) { name, #name " " }
+		CS_DATA(CS5),
+#ifdef CS6
+		    CS_DATA(CS6),
+#endif
+#ifdef CS7
+		    CS_DATA(CS7),
+#endif
+		    CS_DATA(CS8),
+	    };
+	    const char *result = "CSIZE? ";
+	    int value = (tty->c_cflag & CSIZE);
+	    unsigned n;
+
+	    if (value != 0) {
+		for (n = 0; n < SIZEOF(csizes); n++) {
+		    if (csizes[n].value == value) {
+			result = csizes[n].name;
+			break;
+		    }
+		}
+	    }
+	    strcat(buf, result);
+	}
+#endif
+
+	if (tty->c_lflag & ALLLOCAL)
+	    lookup_bits(buf, lflags, "lflags", tty->c_lflag);
+    }
+#else
+    /* reference: ttcompat(4M) on SunOS 4.1 */
+#ifndef EVENP
+#define EVENP 0
+#endif
+#ifndef LCASE
+#define LCASE 0
+#endif
+#ifndef LLITOUT
+#define LLITOUT 0
+#endif
+#ifndef ODDP
+#define ODDP 0
+#endif
+#ifndef TANDEM
+#define TANDEM 0
+#endif
+
+    static const BITNAMES cflags[] =
+    {
+	{CBREAK, "CBREAK"},
+	{CRMOD, "CRMOD"},
+	{ECHO, "ECHO"},
+	{EVENP, "EVENP"},
+	{LCASE, "LCASE"},
+	{LLITOUT, "LLITOUT"},
+	{ODDP, "ODDP"},
+	{RAW, "RAW"},
+	{TANDEM, "TANDEM"},
+	{XTABS, "XTABS"},
+	{0, NULL}
+#define ALLCTRL	(CBREAK|CRMOD|ECHO|EVENP|LCASE|LLITOUT|ODDP|RAW|TANDEM|XTABS)
+    };
+
+    buf = _nc_trace_buf(0,
+			8 + sizeof(cflags));
+    if (buf != 0) {
+	if (tty->sg_flags & ALLCTRL) {
+	    lookup_bits(buf, cflags, "cflags", tty->sg_flags);
+	}
+    }
+#endif
+    return (buf);
+}
+
+NCURSES_EXPORT(char *)
+_nc_tracebits(void)
+{
+    return _nc_trace_ttymode(&(cur_term->Nttyb));
+}
+#else
+EMPTY_MODULE(_nc_tracebits)
+#endif /* TRACE */