lib_baudrate.c revision 89354 
1/****************************************************************************
2 * Copyright (c) 1998,2000 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 ****************************************************************************/
33
34/*
35 *	lib_baudrate.c
36 *
37 */
38
39#include <curses.priv.h>
40#include <term.h>		/* cur_term, pad_char */
41#include <termcap.h>		/* ospeed */
42
43/*
44 * These systems use similar header files, which define B1200 as 1200, etc.,
45 * but can be overridden by defining USE_OLD_TTY so B1200 is 9, which makes all
46 * of the indices up to B115200 fit nicely in a 'short', allowing us to retain
47 * ospeed's type for compatibility.
48 */
49#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
50#undef B0
51#undef B50
52#undef B75
53#undef B110
54#undef B134
55#undef B150
56#undef B200
57#undef B300
58#undef B600
59#undef B1200
60#undef B1800
61#undef B2400
62#undef B4800
63#undef B9600
64#undef B19200
65#undef EXTA
66#undef B38400
67#undef EXTB
68#undef B57600
69#undef B115200
70#undef B230400
71#undef B460800
72#define USE_OLD_TTY
73#include <sys/ttydev.h>
74#else
75#undef USE_OLD_TTY
76#endif /* USE_OLD_TTY */
77
78MODULE_ID("$Id: lib_baudrate.c,v 1.21 2001/06/30 22:59:22 tom Exp $")
79
80/*
81 *	int
82 *	baudrate()
83 *
84 *	Returns the current terminal's baud rate.
85 *
86 */
87
88struct speed {
89    int s;			/* value for 'ospeed' is an index */
90    int sp;			/* the actual speed */
91};
92
93static struct speed const speeds[] =
94{
95    {B0, 0},
96    {B50, 50},
97    {B75, 75},
98    {B110, 110},
99    {B134, 134},
100    {B150, 150},
101    {B200, 200},
102    {B300, 300},
103    {B600, 600},
104    {B1200, 1200},
105    {B1800, 1800},
106    {B2400, 2400},
107    {B4800, 4800},
108    {B9600, 9600},
109#ifdef B19200
110    {B19200, 19200},
111#else
112#ifdef EXTA
113    {EXTA, 19200},
114#endif
115#endif
116#ifdef B38400
117    {B38400, 38400},
118#else
119#ifdef EXTB
120    {EXTB, 38400},
121#endif
122#endif
123#ifdef B57600
124    {B57600, 57600},
125#endif
126#ifdef B115200
127    {B115200, 115200},
128#endif
129#ifdef B230400
130    {B230400, 230400},
131#endif
132#ifdef B460800
133    {B460800, 460800},
134#endif
135};
136
137NCURSES_EXPORT(int)
138_nc_baudrate(int OSpeed)
139{
140    static int last_OSpeed;
141    static int last_baudrate;
142
143    int result;
144    unsigned i;
145
146    if (OSpeed == last_OSpeed) {
147	result = last_baudrate;
148    } else {
149	result = ERR;
150	if (OSpeed >= 0) {
151	    for (i = 0; i < SIZEOF(speeds); i++) {
152		if (speeds[i].s == OSpeed) {
153		    result = speeds[i].sp;
154		    break;
155		}
156	    }
157	}
158	last_baudrate = result;
159    }
160    return (result);
161}
162
163NCURSES_EXPORT(int)
164_nc_ospeed(int BaudRate)
165{
166    int result = 1;
167    unsigned i;
168
169    if (BaudRate >= 0) {
170	for (i = 0; i < SIZEOF(speeds); i++) {
171	    if (speeds[i].sp == BaudRate) {
172		result = speeds[i].s;
173		break;
174	    }
175	}
176    }
177    return (result);
178}
179
180NCURSES_EXPORT(int)
181baudrate(void)
182{
183    int result;
184
185    T((T_CALLED("baudrate()")));
186
187    /*
188     * In debugging, allow the environment symbol to override when we're
189     * redirecting to a file, so we can construct repeatable test-cases
190     * that take into account costs that depend on baudrate.
191     */
192#ifdef TRACE
193    if (SP && !isatty(fileno(SP->_ofp))
194	&& getenv("BAUDRATE") != 0) {
195	int ret;
196	if ((ret = _nc_getenv_num("BAUDRATE")) <= 0)
197	    ret = 9600;
198	ospeed = _nc_ospeed(ret);
199	returnCode(ret);
200    }
201#endif
202
203#ifdef USE_OLD_TTY
204    result = cfgetospeed(&cur_term->Nttyb);
205    ospeed = _nc_ospeed(result);
206#else
207#ifdef TERMIOS
208    ospeed = cfgetospeed(&cur_term->Nttyb);
209#else
210    ospeed = cur_term->Nttyb.sg_ospeed;
211#endif
212    result = _nc_baudrate(ospeed);
213#endif /* __FreeBSD__ */
214    if (cur_term != 0)
215	cur_term->_baudrate = result;
216
217    returnCode(result);
218}
219