1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/* `struct termios' speed frobnication functions. Linux version.
Copyright (C) 1991, 1992, 1993, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <stddef.h>
#include <errno.h>
#include <termios.h>
static const speed_t speeds[] =
{
0,
50,
75,
110,
134,
150,
200,
300,
600,
1200,
1800,
2400,
4800,
9600,
19200,
38400,
38400, /* Mention this twice here is a trick. */
57600,
115200,
230400,
};
/* Return the output baud rate stored in *TERMIOS_P. */
speed_t
cfgetospeed (termios_p)
const struct termios *termios_p;
{
speed_t retval = termios_p->c_cflag & (CBAUD | CBAUDEX);
if (retval & CBAUDEX)
{
retval &= ~CBAUDEX;
retval |= CBAUD + 1;
}
return retval;
}
/* Return the input baud rate stored in *TERMIOS_P.
For Linux there is no difference between input and output speed. */
strong_alias (cfgetospeed, cfgetispeed);
/* Set the output baud rate stored in *TERMIOS_P to SPEED. */
int
cfsetospeed (termios_p, speed)
struct termios *termios_p;
speed_t speed;
{
register unsigned int i;
if (termios_p == NULL)
{
errno = EINVAL;
return -1;
}
/* This allows either B1200 or 1200 to work. XXX
Do we really want to try to support this, given that
fetching the speed must return one or the other? */
for (i = 0; i < sizeof (speeds) / sizeof (speeds[0]); ++i)
if (i == speed || speeds[i] == speed)
{
termios_p->c_cflag &= ~(CBAUD | CBAUDEX);
termios_p->c_cflag |= (i & CBAUD);
if (i & ~CBAUD)
termios_p->c_cflag |= CBAUDEX;
return 0;
}
errno = EINVAL;
return -1;
}
/* Set the input baud rate stored in *TERMIOS_P to SPEED.
For Linux there is no difference between input and output speed. */
strong_alias (cfsetospeed, cfsetispeed);
|
