1 /****************************************************************************
2  * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
3  *                                                                          *
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5  * copy of this software and associated documentation files (the            *
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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  *                                                                          *
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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               *
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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   *
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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  *     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 (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 1.31 2010/12/19 01:50:50 tom Exp $")
83 
84 /*
85  *	int
86  *	baudrate()
87  *
88  *	Returns the current terminal's baud rate.
89  *
90  */
91 
92 struct speed {
93     int s;			/* value for 'ospeed' is an index */
94     int sp;			/* the actual speed */
95 };
96 
97 static struct speed const speeds[] =
98 {
99     {B0, 0},
100     {B50, 50},
101     {B75, 75},
102     {B110, 110},
103     {B134, 134},
104     {B150, 150},
105     {B200, 200},
106     {B300, 300},
107     {B600, 600},
108     {B1200, 1200},
109     {B1800, 1800},
110     {B2400, 2400},
111     {B4800, 4800},
112     {B9600, 9600},
113 #ifdef B19200
114     {B19200, 19200},
115 #else
116 #ifdef EXTA
117     {EXTA, 19200},
118 #endif
119 #endif
120 #ifdef B38400
121     {B38400, 38400},
122 #else
123 #ifdef EXTB
124     {EXTB, 38400},
125 #endif
126 #endif
127 #ifdef B57600
128     {B57600, 57600},
129 #endif
130 #ifdef B115200
131     {B115200, 115200},
132 #endif
133 #ifdef B230400
134     {B230400, 230400},
135 #endif
136 #ifdef B460800
137     {B460800, 460800},
138 #endif
139 #ifdef B921600
140     {B921600, 921600},
141 #endif
142 };
143 
144 NCURSES_EXPORT(int)
145 _nc_baudrate(int OSpeed)
146 {
147 #if !USE_REENTRANT
148     static int last_OSpeed;
149     static int last_baudrate;
150 #endif
151 
152     int result = ERR;
153     unsigned i;
154 
155 #if !USE_REENTRANT
156     if (OSpeed == last_OSpeed) {
157 	result = last_baudrate;
158     }
159 #endif
160     if (result == ERR) {
161 	if (OSpeed >= 0) {
162 	    for (i = 0; i < SIZEOF(speeds); i++) {
163 		if (speeds[i].s == OSpeed) {
164 		    result = speeds[i].sp;
165 		    break;
166 		}
167 	    }
168 	}
169 #if !USE_REENTRANT
170 	if (OSpeed == last_OSpeed) {
171 	    last_OSpeed = OSpeed;
172 	    last_baudrate = result;
173 	}
174 #endif
175     }
176     return (result);
177 }
178 
179 NCURSES_EXPORT(int)
180 _nc_ospeed(int BaudRate)
181 {
182     int result = 1;
183     unsigned i;
184 
185     if (BaudRate >= 0) {
186 	for (i = 0; i < SIZEOF(speeds); i++) {
187 	    if (speeds[i].sp == BaudRate) {
188 		result = speeds[i].s;
189 		break;
190 	    }
191 	}
192     }
193     return (result);
194 }
195 
196 NCURSES_EXPORT(int)
197 NCURSES_SP_NAME(baudrate) (NCURSES_SP_DCL0)
198 {
199     int result;
200 
201     T((T_CALLED("baudrate(%p)"), (void *) SP_PARM));
202 
203     /*
204      * In debugging, allow the environment symbol to override when we're
205      * redirecting to a file, so we can construct repeatable test-cases
206      * that take into account costs that depend on baudrate.
207      */
208 #ifdef TRACE
209     if (IsValidTIScreen(SP_PARM)
210 	&& !isatty(fileno(SP_PARM ? SP_PARM->_ofp : stdout))
211 	&& getenv("BAUDRATE") != 0) {
212 	int ret;
213 	if ((ret = _nc_getenv_num("BAUDRATE")) <= 0)
214 	    ret = 9600;
215 	ospeed = (NCURSES_OSPEED) _nc_ospeed(ret);
216 	returnCode(ret);
217     }
218 #endif
219 
220     if (IsValidTIScreen(SP_PARM)) {
221 #ifdef USE_OLD_TTY
222 	result = cfgetospeed(&(TerminalOf(SP_PARM)->Nttyb));
223 	ospeed = _nc_ospeed(result);
224 #else /* !USE_OLD_TTY */
225 #ifdef TERMIOS
226 	ospeed = (NCURSES_OSPEED) cfgetospeed(&(TerminalOf(SP_PARM)->Nttyb));
227 #else
228 	ospeed = (NCURSES_OSPEED) TerminalOf(SP_PARM)->Nttyb.sg_ospeed;
229 #endif
230 	result = _nc_baudrate(ospeed);
231 #endif
232 	TerminalOf(SP_PARM)->_baudrate = result;
233     } else {
234 	result = ERR;
235     }
236 
237     returnCode(result);
238 }
239 
240 #if NCURSES_SP_FUNCS
241 NCURSES_EXPORT(int)
242 baudrate(void)
243 {
244     return NCURSES_SP_NAME(baudrate) (CURRENT_SCREEN);
245 }
246 #endif
247