lib_baudrate.c revision 97049 
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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#undef B921600
73#define USE_OLD_TTY
74#include <sys/ttydev.h>
75#else
76#undef USE_OLD_TTY
77#endif /* USE_OLD_TTY */
78
79MODULE_ID("$Id: lib_baudrate.c,v 1.22 2002/01/19 23:07:53 Andrey.A.Chernov Exp $")
80
81/*
82 *	int
83 *	baudrate()
84 *
85 *	Returns the current terminal's baud rate.
86 *
87 */
88
89struct speed {
90    int s;			/* value for 'ospeed' is an index */
91    int sp;			/* the actual speed */
92};
93
94static struct speed const speeds[] =
95{
96    {B0, 0},
97    {B50, 50},
98    {B75, 75},
99    {B110, 110},
100    {B134, 134},
101    {B150, 150},
102    {B200, 200},
103    {B300, 300},
104    {B600, 600},
105    {B1200, 1200},
106    {B1800, 1800},
107    {B2400, 2400},
108    {B4800, 4800},
109    {B9600, 9600},
110#ifdef B19200
111    {B19200, 19200},
112#else
113#ifdef EXTA
114    {EXTA, 19200},
115#endif
116#endif
117#ifdef B38400
118    {B38400, 38400},
119#else
120#ifdef EXTB
121    {EXTB, 38400},
122#endif
123#endif
124#ifdef B57600
125    {B57600, 57600},
126#endif
127#ifdef B115200
128    {B115200, 115200},
129#endif
130#ifdef B230400
131    {B230400, 230400},
132#endif
133#ifdef B460800
134    {B460800, 460800},
135#endif
136#ifdef B921600
137    {B921600, 921600},
138#endif
139};
140
141NCURSES_EXPORT(int)
142_nc_baudrate(int OSpeed)
143{
144    static int last_OSpeed;
145    static int last_baudrate;
146
147    int result;
148    unsigned i;
149
150    if (OSpeed == last_OSpeed) {
151	result = last_baudrate;
152    } else {
153	result = ERR;
154	if (OSpeed >= 0) {
155	    for (i = 0; i < SIZEOF(speeds); i++) {
156		if (speeds[i].s == OSpeed) {
157		    result = speeds[i].sp;
158		    break;
159		}
160	    }
161	}
162	last_baudrate = result;
163    }
164    return (result);
165}
166
167NCURSES_EXPORT(int)
168_nc_ospeed(int BaudRate)
169{
170    int result = 1;
171    unsigned i;
172
173    if (BaudRate >= 0) {
174	for (i = 0; i < SIZEOF(speeds); i++) {
175	    if (speeds[i].sp == BaudRate) {
176		result = speeds[i].s;
177		break;
178	    }
179	}
180    }
181    return (result);
182}
183
184NCURSES_EXPORT(int)
185baudrate(void)
186{
187    int result;
188
189    T((T_CALLED("baudrate()")));
190
191    /*
192     * In debugging, allow the environment symbol to override when we're
193     * redirecting to a file, so we can construct repeatable test-cases
194     * that take into account costs that depend on baudrate.
195     */
196#ifdef TRACE
197    if (SP && !isatty(fileno(SP->_ofp))
198	&& getenv("BAUDRATE") != 0) {
199	int ret;
200	if ((ret = _nc_getenv_num("BAUDRATE")) <= 0)
201	    ret = 9600;
202	ospeed = _nc_ospeed(ret);
203	returnCode(ret);
204    }
205#endif
206
207#ifdef USE_OLD_TTY
208    result = cfgetospeed(&cur_term->Nttyb);
209    ospeed = _nc_ospeed(result);
210#else /* !USE_OLD_TTY */
211#ifdef TERMIOS
212    ospeed = cfgetospeed(&cur_term->Nttyb);
213#else
214    ospeed = cur_term->Nttyb.sg_ospeed;
215#endif
216    result = _nc_baudrate(ospeed);
217#endif
218    if (cur_term != 0)
219	cur_term->_baudrate = result;
220
221    returnCode(result);
222}
223