1/****************************************************************************
2 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
3 *                                                                          *
4 * Permission is hereby granted, free of charge, to any person obtaining a  *
5 * copy of this software and associated documentation files (the            *
6 * "Software"), to deal in the Software without restriction, including      *
7 * without limitation the rights to use, copy, modify, merge, publish,      *
8 * distribute, distribute with modifications, sublicense, and/or sell       *
9 * copies of the Software, and to permit persons to whom the Software is    *
10 * furnished to do so, subject to the following conditions:                 *
11 *                                                                          *
12 * The above copyright notice and this permission notice shall be included  *
13 * in all copies or substantial portions of the Software.                   *
14 *                                                                          *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22 *                                                                          *
23 * Except as contained in this notice, the name(s) of the above copyright   *
24 * holders shall not be used in advertising or otherwise to promote the     *
25 * sale, use or other dealings in this Software without prior written       *
26 * authorization.                                                           *
27 ****************************************************************************/
28
29/****************************************************************************
30 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32 *     and: Thomas E. Dickey                        1996-on                 *
33 ****************************************************************************/
34
35/*
36 *	lib_baudrate.c
37 *
38 */
39
40#include <curses.priv.h>
41#include <term.h>		/* cur_term, pad_char */
42#include <termcap.h>		/* ospeed */
43#if defined(__FreeBSD__)
44#include <sys/param.h>
45#endif
46
47/*
48 * These systems use similar header files, which define B1200 as 1200, etc.,
49 * but can be overridden by defining USE_OLD_TTY so B1200 is 9, which makes all
50 * of the indices up to B115200 fit nicely in a 'short', allowing us to retain
51 * ospeed's type for compatibility.
52 */
53#if (defined(__FreeBSD__) && (__FreeBSD_version < 700000)) || defined(__NetBSD__) || defined(__OpenBSD__)
54#undef B0
55#undef B50
56#undef B75
57#undef B110
58#undef B134
59#undef B150
60#undef B200
61#undef B300
62#undef B600
63#undef B1200
64#undef B1800
65#undef B2400
66#undef B4800
67#undef B9600
68#undef B19200
69#undef EXTA
70#undef B38400
71#undef EXTB
72#undef B57600
73#undef B115200
74#undef B230400
75#undef B460800
76#undef B921600
77#define USE_OLD_TTY
78#include <sys/ttydev.h>
79#else
80#undef USE_OLD_TTY
81#endif /* USE_OLD_TTY */
82
83MODULE_ID("$Id: lib_baudrate.c,v 1.27 2008/06/28 15:19:24 tom Exp $")
84
85/*
86 *	int
87 *	baudrate()
88 *
89 *	Returns the current terminal's baud rate.
90 *
91 */
92
93struct speed {
94    int s;			/* value for 'ospeed' is an index */
95    int sp;			/* the actual speed */
96};
97
98static struct speed const speeds[] =
99{
100    {B0, 0},
101    {B50, 50},
102    {B75, 75},
103    {B110, 110},
104    {B134, 134},
105    {B150, 150},
106    {B200, 200},
107    {B300, 300},
108    {B600, 600},
109    {B1200, 1200},
110    {B1800, 1800},
111    {B2400, 2400},
112    {B4800, 4800},
113    {B9600, 9600},
114#ifdef B19200
115    {B19200, 19200},
116#else
117#ifdef EXTA
118    {EXTA, 19200},
119#endif
120#endif
121#ifdef B38400
122    {B38400, 38400},
123#else
124#ifdef EXTB
125    {EXTB, 38400},
126#endif
127#endif
128#ifdef B57600
129    {B57600, 57600},
130#endif
131#ifdef B115200
132    {B115200, 115200},
133#endif
134#ifdef B230400
135    {B230400, 230400},
136#endif
137#ifdef B460800
138    {B460800, 460800},
139#endif
140#ifdef B921600
141    {B921600, 921600},
142#endif
143};
144
145NCURSES_EXPORT(int)
146_nc_baudrate(int OSpeed)
147{
148#if !USE_REENTRANT
149    static int last_OSpeed;
150    static int last_baudrate;
151#endif
152
153    int result = ERR;
154    unsigned i;
155
156#if !USE_REENTRANT
157    if (OSpeed == last_OSpeed) {
158	result = last_baudrate;
159    }
160#endif
161    if (result == ERR) {
162	if (OSpeed >= 0) {
163	    for (i = 0; i < SIZEOF(speeds); i++) {
164		if (speeds[i].s == OSpeed) {
165		    result = speeds[i].sp;
166		    break;
167		}
168	    }
169	}
170#if !USE_REENTRANT
171	if (OSpeed == last_OSpeed) {
172	    last_OSpeed = OSpeed;
173	    last_baudrate = result;
174	}
175#endif
176    }
177    return (result);
178}
179
180NCURSES_EXPORT(int)
181_nc_ospeed(int BaudRate)
182{
183    int result = 1;
184    unsigned i;
185
186    if (BaudRate >= 0) {
187	for (i = 0; i < SIZEOF(speeds); i++) {
188	    if (speeds[i].sp == BaudRate) {
189		result = speeds[i].s;
190		break;
191	    }
192	}
193    }
194    return (result);
195}
196
197NCURSES_EXPORT(int)
198baudrate(void)
199{
200    int result;
201
202    T((T_CALLED("baudrate()")));
203
204    /*
205     * In debugging, allow the environment symbol to override when we're
206     * redirecting to a file, so we can construct repeatable test-cases
207     * that take into account costs that depend on baudrate.
208     */
209#ifdef TRACE
210    if (!isatty(fileno(SP ? SP->_ofp : stdout))
211	&& getenv("BAUDRATE") != 0) {
212	int ret;
213	if ((ret = _nc_getenv_num("BAUDRATE")) <= 0)
214	    ret = 9600;
215	ospeed = _nc_ospeed(ret);
216	returnCode(ret);
217    }
218#endif
219
220    if (cur_term != 0) {
221#ifdef USE_OLD_TTY
222	result = cfgetospeed(&cur_term->Nttyb);
223	ospeed = _nc_ospeed(result);
224#else /* !USE_OLD_TTY */
225#ifdef TERMIOS
226	ospeed = cfgetospeed(&cur_term->Nttyb);
227#else
228	ospeed = cur_term->Nttyb.sg_ospeed;
229#endif
230	result = _nc_baudrate(ospeed);
231#endif
232	cur_term->_baudrate = result;
233    } else {
234	result = ERR;
235    }
236
237    returnCode(result);
238}
239