1/* vi: set sw=4 ts=4: */
2/*
3 * compact speed_t <-> speed functions for busybox
4 *
5 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10#include <termios.h>
11#include "libbb.h"
12
13struct speed_map {
14	unsigned short speed;
15	unsigned short value;
16};
17
18static const struct speed_map speeds[] = {
19	{B0, 0},
20	{B50, 50},
21	{B75, 75},
22	{B110, 110},
23	{B134, 134},
24	{B150, 150},
25	{B200, 200},
26	{B300, 300},
27	{B600, 600},
28	{B1200, 1200},
29	{B1800, 1800},
30	{B2400, 2400},
31	{B4800, 4800},
32	{B9600, 9600},
33#ifdef	B19200
34	{B19200, 19200},
35#elif defined(EXTA)
36	{EXTA, 19200},
37#endif
38#ifdef	B38400
39	{B38400, 38400/256 + 0x8000U},
40#elif defined(EXTB)
41	{EXTB, 38400/256 + 0x8000U},
42#endif
43#ifdef B57600
44	{B57600, 57600/256 + 0x8000U},
45#endif
46#ifdef B115200
47	{B115200, 115200/256 + 0x8000U},
48#endif
49#ifdef B230400
50	{B230400, 230400/256 + 0x8000U},
51#endif
52#ifdef B460800
53	{B460800, 460800/256 + 0x8000U},
54#endif
55};
56
57enum { NUM_SPEEDS = ARRAY_SIZE(speeds) };
58
59unsigned int tty_baud_to_value(speed_t speed)
60{
61	int i = 0;
62
63	do {
64		if (speed == speeds[i].speed) {
65			if (speeds[i].value & 0x8000U) {
66				return ((unsigned long) (speeds[i].value) & 0x7fffU) * 256;
67			}
68			return speeds[i].value;
69		}
70	} while (++i < NUM_SPEEDS);
71
72	return 0;
73}
74
75speed_t tty_value_to_baud(unsigned int value)
76{
77	int i = 0;
78
79	do {
80		if (value == tty_baud_to_value(speeds[i].speed)) {
81			return speeds[i].speed;
82		}
83	} while (++i < NUM_SPEEDS);
84
85	return (speed_t) - 1;
86}
87