lib_baudrate.c revision 148032 
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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/* $FreeBSD: head/contrib/ncurses/ncurses/tinfo/lib_baudrate.c 148032 2005-07-15 07:41:26Z phk $ */
35
36/*
37 *	lib_baudrate.c
38 *
39 */
40
41#include <curses.priv.h>
42#include <term.h>		/* cur_term, pad_char */
43#include <termcap.h>		/* ospeed */
44
45/*
46 * These systems use similar header files, which define B1200 as 1200, etc.,
47 * but can be overridden by defining USE_OLD_TTY so B1200 is 9, which makes all
48 * of the indices up to B115200 fit nicely in a 'short', allowing us to retain
49 * ospeed's type for compatibility.
50 */
51#if defined(__NetBSD__) || defined(__OpenBSD__)
52#undef B0
53#undef B50
54#undef B75
55#undef B110
56#undef B134
57#undef B150
58#undef B200
59#undef B300
60#undef B600
61#undef B1200
62#undef B1800
63#undef B2400
64#undef B4800
65#undef B9600
66#undef B19200
67#undef EXTA
68#undef B38400
69#undef EXTB
70#undef B57600
71#undef B115200
72#undef B230400
73#undef B460800
74#undef B921600
75#define USE_OLD_TTY
76#include <sys/ttydev.h>
77#else
78#undef USE_OLD_TTY
79#endif /* USE_OLD_TTY */
80
81MODULE_ID("$Id: lib_baudrate.c,v 1.22 2002/01/19 23:07:53 Andrey.A.Chernov Exp $")
82
83/*
84 *	int
85 *	baudrate()
86 *
87 *	Returns the current terminal's baud rate.
88 *
89 */
90
91struct speed {
92    int s;			/* value for 'ospeed' is an index */
93    int sp;			/* the actual speed */
94};
95
96static struct speed const speeds[] =
97{
98    {B0, 0},
99    {B50, 50},
100    {B75, 75},
101    {B110, 110},
102    {B134, 134},
103    {B150, 150},
104    {B200, 200},
105    {B300, 300},
106    {B600, 600},
107    {B1200, 1200},
108    {B1800, 1800},
109    {B2400, 2400},
110    {B4800, 4800},
111    {B9600, 9600},
112#ifdef B19200
113    {B19200, 19200},
114#else
115#ifdef EXTA
116    {EXTA, 19200},
117#endif
118#endif
119#ifdef B38400
120    {B38400, 38400},
121#else
122#ifdef EXTB
123    {EXTB, 38400},
124#endif
125#endif
126#ifdef B57600
127    {B57600, 57600},
128#endif
129#ifdef B115200
130    {B115200, 115200},
131#endif
132#ifdef B230400
133    {B230400, 230400},
134#endif
135#ifdef B460800
136    {B460800, 460800},
137#endif
138#ifdef B921600
139    {B921600, 921600},
140#endif
141};
142
143NCURSES_EXPORT(int)
144_nc_baudrate(int OSpeed)
145{
146    static int last_OSpeed;
147    static int last_baudrate;
148
149    int result;
150    unsigned i;
151
152    if (OSpeed == last_OSpeed) {
153	result = last_baudrate;
154    } else {
155	result = ERR;
156	if (OSpeed >= 0) {
157	    for (i = 0; i < SIZEOF(speeds); i++) {
158		if (speeds[i].s == OSpeed) {
159		    result = speeds[i].sp;
160		    break;
161		}
162	    }
163	}
164	last_baudrate = result;
165    }
166    return (result);
167}
168
169NCURSES_EXPORT(int)
170_nc_ospeed(int BaudRate)
171{
172    int result = 1;
173    unsigned i;
174
175    if (BaudRate >= 0) {
176	for (i = 0; i < SIZEOF(speeds); i++) {
177	    if (speeds[i].sp == BaudRate) {
178		result = speeds[i].s;
179		break;
180	    }
181	}
182    }
183    return (result);
184}
185
186NCURSES_EXPORT(int)
187baudrate(void)
188{
189    int result;
190
191    T((T_CALLED("baudrate()")));
192
193    /*
194     * In debugging, allow the environment symbol to override when we're
195     * redirecting to a file, so we can construct repeatable test-cases
196     * that take into account costs that depend on baudrate.
197     */
198#ifdef TRACE
199    if (SP && !isatty(fileno(SP->_ofp))
200	&& getenv("BAUDRATE") != 0) {
201	int ret;
202	if ((ret = _nc_getenv_num("BAUDRATE")) <= 0)
203	    ret = 9600;
204	ospeed = _nc_ospeed(ret);
205	returnCode(ret);
206    }
207#endif
208
209#ifdef USE_OLD_TTY
210    result = cfgetospeed(&cur_term->Nttyb);
211    ospeed = _nc_ospeed(result);
212#else /* !USE_OLD_TTY */
213#ifdef TERMIOS
214    ospeed = cfgetospeed(&cur_term->Nttyb);
215#else
216    ospeed = cur_term->Nttyb.sg_ospeed;
217#endif
218    result = _nc_baudrate(ospeed);
219#endif
220    if (cur_term != 0)
221	cur_term->_baudrate = result;
222
223    returnCode(result);
224}
225