4077ba384076bf11775bb95c727ebeca6239c524
[ncurses.git] / ncurses / tinfo / lib_baudrate.c
1 /****************************************************************************
2  * Copyright (c) 1998 Free Software Foundation, Inc.                        *
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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 /*
36  *      lib_baudrate.c
37  *
38  */
39
40 #include <curses.priv.h>
41 #include <term.h>       /* cur_term, pad_char */
42 #include <termcap.h>    /* ospeed */
43
44 MODULE_ID("$Id: lib_baudrate.c,v 1.15 1999/01/31 03:05:25 tom Exp $")
45
46 /*
47  *      int
48  *      baudrate()
49  *
50  *      Returns the current terminal's baud rate.
51  *
52  */
53
54 struct speed {
55         speed_t s;
56         int sp;
57 };
58
59 static struct speed const speeds[] = {
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
102 int _nc_baudrate(int OSpeed)
103 {
104         static int last_OSpeed;
105         static int last_baudrate;
106
107         int result;
108         unsigned i;
109
110         if (OSpeed == last_OSpeed) {
111                 result = last_baudrate;
112         } else {
113                 result = ERR;
114                 if (OSpeed >= 0) {
115                         for (i = 0; i < SIZEOF(speeds); i++) {
116                                 if (speeds[i].s == (speed_t)OSpeed) {
117                                         result = speeds[i].sp;
118                                         break;
119                                 }
120                         }
121                 }
122                 last_baudrate = result;
123         }
124         return (result);
125 }
126
127
128 int _nc_ospeed(int BaudRate)
129 {
130         speed_t result = 1;
131         unsigned i;
132
133         if (BaudRate >= 0) {
134                 for (i = 0; i < SIZEOF(speeds); i++) {
135                         if (speeds[i].sp == BaudRate) {
136                                 result = speeds[i].s;
137                                 break;
138                         }
139                 }
140         }
141         return (result);
142 }
143
144 int
145 baudrate(void)
146 {
147 int result;
148
149         T((T_CALLED("baudrate()")));
150
151         /*
152          * In debugging, allow the environment symbol to override when we're
153          * redirecting to a file, so we can construct repeatable test-cases
154          * that take into account costs that depend on baudrate.
155          */
156 #ifdef TRACE
157         if (SP && !isatty(fileno(SP->_ofp))
158          && getenv("BAUDRATE") != 0) {
159                 int ret;
160                 if ((ret = _nc_getenv_num("BAUDRATE")) <= 0)
161                         ret = 9600;
162                 ospeed = _nc_ospeed(ret);
163                 returnCode(ret);
164         }
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 }