1 /****************************************************************************
2  * Copyright (c) 1998-2010,2013 Free Software Foundation, Inc.              *
3  *                                                                          *
4  * Permission is hereby granted, free of charge, to any person obtaining a  *
5  * copy of this software and associated documentation files (the            *
6  * "Software"), to deal in the Software without restriction, including      *
7  * without limitation the rights to use, copy, modify, merge, publish,      *
8  * distribute, distribute with modifications, sublicense, and/or sell       *
9  * copies of the Software, and to permit persons to whom the Software is    *
10  * furnished to do so, subject to the following conditions:                 *
11  *                                                                          *
12  * The above copyright notice and this permission notice shall be included  *
13  * in all copies or substantial portions of the Software.                   *
14  *                                                                          *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22  *                                                                          *
23  * Except as contained in this notice, the name(s) of the above copyright   *
24  * holders shall not be used in advertising or otherwise to promote the     *
25  * sale, use or other dealings in this Software without prior written       *
26  * authorization.                                                           *
27  ****************************************************************************/
28 
29 /****************************************************************************
30  *  Author: Zeyd M. Ben-Halim <[email protected]> 1992,1995               *
31  *     and: Eric S. Raymond <[email protected]>                         *
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 
82 MODULE_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 
92 struct speed {
93     NCURSES_OSPEED s;		/* values for 'ospeed' */
94     int sp;			/* the actual speed */
95 };
96 
97 #define DATA(number) { (NCURSES_OSPEED)B##number, number }
98 
99 static 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 
145 NCURSES_EXPORT(int)
_nc_baudrate(int OSpeed)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 
180 NCURSES_EXPORT(int)
_nc_ospeed(int BaudRate)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 
197 NCURSES_EXPORT(int)
NCURSES_SP_NAME(baudrate)198 NCURSES_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
242 NCURSES_EXPORT(int)
baudrate(void)243 baudrate(void)
244 {
245     return NCURSES_SP_NAME(baudrate) (CURRENT_SCREEN);
246 }
247 #endif
248