lib_baudrate.c revision 76726 
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2 * Copyright (c) 1998,2000 Free Software Foundation, Inc.                   *
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14 *                                                                          *
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16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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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
43MODULE_ID("$Id: lib_baudrate.c,v 1.19 2000/12/10 02:55:07 tom Exp $")
44
45/*
46 *	int
47 *	baudrate()
48 *
49 *	Returns the current terminal's baud rate.
50 *
51 */
52
53struct speed {
54    int s;			/* value for 'ospeed' is an index */
55    int sp;			/* the actual speed */
56};
57
58static struct speed const speeds[] =
59{
60    {B0, 0},
61    {B50, 50},
62    {B75, 75},
63    {B110, 110},
64    {B134, 134},
65    {B150, 150},
66    {B200, 200},
67    {B300, 300},
68    {B600, 600},
69    {B1200, 1200},
70    {B1800, 1800},
71    {B2400, 2400},
72    {B4800, 4800},
73    {B9600, 9600},
74#ifdef B19200
75    {B19200, 19200},
76#else
77#ifdef EXTA
78    {EXTA, 19200},
79#endif
80#endif
81#ifdef B38400
82    {B38400, 38400},
83#else
84#ifdef EXTB
85    {EXTB, 38400},
86#endif
87#endif
88#ifdef B57600
89    {B57600, 57600},
90#endif
91#ifdef B115200
92    {B115200, 115200},
93#endif
94#ifdef B230400
95    {B230400, 230400},
96#endif
97#ifdef B460800
98    {B460800, 460800},
99#endif
100};
101
102NCURSES_EXPORT(int)
103_nc_baudrate(int OSpeed)
104{
105    static int last_OSpeed;
106    static int last_baudrate;
107
108    int result;
109    unsigned i;
110
111    if (OSpeed == last_OSpeed) {
112	result = last_baudrate;
113    } else {
114	result = ERR;
115	if (OSpeed >= 0) {
116	    for (i = 0; i < SIZEOF(speeds); i++) {
117		if (speeds[i].s == OSpeed) {
118		    result = speeds[i].sp;
119		    break;
120		}
121	    }
122	}
123	last_baudrate = result;
124    }
125    return (result);
126}
127
128NCURSES_EXPORT(int)
129_nc_ospeed(int BaudRate)
130{
131    int result = 1;
132    unsigned i;
133
134    if (BaudRate >= 0) {
135	for (i = 0; i < SIZEOF(speeds); i++) {
136	    if (speeds[i].sp == BaudRate) {
137		result = speeds[i].s;
138		break;
139	    }
140	}
141    }
142    return (result);
143}
144
145NCURSES_EXPORT(int)
146baudrate(void)
147{
148    int result;
149
150    T((T_CALLED("baudrate()")));
151
152    /*
153     * In debugging, allow the environment symbol to override when we're
154     * redirecting to a file, so we can construct repeatable test-cases
155     * that take into account costs that depend on baudrate.
156     */
157#ifdef TRACE
158    if (SP && !isatty(fileno(SP->_ofp))
159	&& getenv("BAUDRATE") != 0) {
160	int ret;
161	if ((ret = _nc_getenv_num("BAUDRATE")) <= 0)
162	    ret = 9600;
163	ospeed = _nc_ospeed(ret);
164	returnCode(ret);
165    } else
166#endif
167
168#ifdef TERMIOS
169	ospeed = cfgetospeed(&cur_term->Nttyb);
170#else
171	ospeed = cur_term->Nttyb.sg_ospeed;
172#endif
173    result = _nc_baudrate(ospeed);
174    if (cur_term != 0)
175	cur_term->_baudrate = result;
176
177    returnCode(result);
178}
179