lib_baudrate.c revision 262685 
1/****************************************************************************
2 * Copyright (c) 1998-2010,2013 Free Software Foundation, Inc.              *
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14 *                                                                          *
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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 <termcap.h>		/* ospeed */
42#if defined(__FreeBSD__)
43#include <sys/param.h>
44#endif
45
46/*
47 * These systems use similar header files, which define B1200 as 1200, etc.,
48 * but can be overridden by defining USE_OLD_TTY so B1200 is 9, which makes all
49 * of the indices up to B115200 fit nicely in a 'short', allowing us to retain
50 * ospeed's type for compatibility.
51 */
52#if NCURSES_OSPEED_COMPAT && ((defined(__FreeBSD__) && (__FreeBSD_version < 700000)) || defined(__NetBSD__) || defined(__OpenBSD__))
53#undef B0
54#undef B50
55#undef B75
56#undef B110
57#undef B134
58#undef B150
59#undef B200
60#undef B300
61#undef B600
62#undef B1200
63#undef B1800
64#undef B2400
65#undef B4800
66#undef B9600
67#undef B19200
68#undef EXTA
69#undef B38400
70#undef EXTB
71#undef B57600
72#undef B115200
73#undef B230400
74#undef B460800
75#undef B921600
76#define USE_OLD_TTY
77#include <sys/ttydev.h>
78#else
79#undef USE_OLD_TTY
80#endif /* USE_OLD_TTY */
81
82MODULE_ID("$Id: lib_baudrate.c,v 1.34 2013/12/15 01:29:02 tom Exp $")
83
84/*
85 *	int
86 *	baudrate()
87 *
88 *	Returns the current terminal's baud rate.
89 *
90 */
91
92struct speed {
93    NCURSES_OSPEED s;		/* values for 'ospeed' */
94    int sp;			/* the actual speed */
95};
96
97#define DATA(number) { B##number, number }
98
99static struct speed const speeds[] =
100{
101    DATA(0),
102    DATA(50),
103    DATA(75),
104    DATA(110),
105    DATA(134),
106    DATA(150),
107    DATA(200),
108    DATA(300),
109    DATA(600),
110    DATA(1200),
111    DATA(1800),
112    DATA(2400),
113    DATA(4800),
114    DATA(9600),
115#ifdef B19200
116    DATA(19200),
117#elif defined(EXTA)
118    {EXTA, 19200},
119#endif
120#ifdef B38400
121    DATA(38400),
122#elif defined(EXTB)
123    {EXTB, 38400},
124#endif
125#ifdef B57600
126    DATA(57600),
127#endif
128    /* ifdef to prevent overflow when OLD_TTY is not available */
129#if !(NCURSES_OSPEED_COMPAT && defined(__FreeBSD__) && (__FreeBSD_version > 700000))
130#ifdef B115200
131    DATA(115200),
132#endif
133#ifdef B230400
134    DATA(230400),
135#endif
136#ifdef B460800
137    DATA(460800),
138#endif
139#ifdef B921600
140    DATA(921600),
141#endif
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)
198NCURSES_SP_NAME(baudrate) (NCURSES_SP_DCL0)
199{
200    int result;
201
202    T((T_CALLED("baudrate(%p)"), (void *) SP_PARM));
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 (IsValidTIScreen(SP_PARM)
211	&& !isatty(fileno(SP_PARM ? SP_PARM->_ofp : stdout))
212	&& getenv("BAUDRATE") != 0) {
213	int ret;
214	if ((ret = _nc_getenv_num("BAUDRATE")) <= 0)
215	    ret = 9600;
216	ospeed = (NCURSES_OSPEED) _nc_ospeed(ret);
217	returnCode(ret);
218    }
219#endif
220
221    if (IsValidTIScreen(SP_PARM)) {
222#ifdef USE_OLD_TTY
223	result = (int) cfgetospeed(&(TerminalOf(SP_PARM)->Nttyb));
224	ospeed = (NCURSES_OSPEED) _nc_ospeed(result);
225#else /* !USE_OLD_TTY */
226#ifdef TERMIOS
227	ospeed = (NCURSES_OSPEED) cfgetospeed(&(TerminalOf(SP_PARM)->Nttyb));
228#else
229	ospeed = (NCURSES_OSPEED) TerminalOf(SP_PARM)->Nttyb.sg_ospeed;
230#endif
231	result = _nc_baudrate(ospeed);
232#endif
233	TerminalOf(SP_PARM)->_baudrate = result;
234    } else {
235	result = ERR;
236    }
237
238    returnCode(result);
239}
240
241#if NCURSES_SP_FUNCS
242NCURSES_EXPORT(int)
243baudrate(void)
244{
245    return NCURSES_SP_NAME(baudrate) (CURRENT_SCREEN);
246}
247#endif
248