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 "libbb.h"
11
12struct speed_map {
13	unsigned short speed;
14	unsigned short value;
15};
16
17static const struct speed_map speeds[] = {
18	{B0, 0},
19	{B50, 50},
20	{B75, 75},
21	{B110, 110},
22	{B134, 134},
23	{B150, 150},
24	{B200, 200},
25	{B300, 300},
26	{B600, 600},
27	{B1200, 1200},
28	{B1800, 1800},
29	{B2400, 2400},
30	{B4800, 4800},
31	{B9600, 9600},
32#ifdef	B19200
33	{B19200, 19200},
34#elif defined(EXTA)
35	{EXTA, 19200},
36#endif
37#ifdef	B38400
38	{B38400, 38400/256 + 0x8000U},
39#elif defined(EXTB)
40	{EXTB, 38400/256 + 0x8000U},
41#endif
42#ifdef B57600
43	{B57600, 57600/256 + 0x8000U},
44#endif
45#ifdef B115200
46	{B115200, 115200/256 + 0x8000U},
47#endif
48#ifdef B230400
49	{B230400, 230400/256 + 0x8000U},
50#endif
51#ifdef B460800
52	{B460800, 460800/256 + 0x8000U},
53#endif
54#ifdef B921600
55	{B921600, 921600/256 + 0x8000U},
56#endif
57};
58
59enum { NUM_SPEEDS = ARRAY_SIZE(speeds) };
60
61unsigned FAST_FUNC tty_baud_to_value(speed_t speed)
62{
63	int i = 0;
64
65	do {
66		if (speed == speeds[i].speed) {
67			if (speeds[i].value & 0x8000U) {
68				return ((unsigned long) (speeds[i].value) & 0x7fffU) * 256;
69			}
70			return speeds[i].value;
71		}
72	} while (++i < NUM_SPEEDS);
73
74	return 0;
75}
76
77speed_t FAST_FUNC tty_value_to_baud(unsigned int value)
78{
79	int i = 0;
80
81	do {
82		if (value == tty_baud_to_value(speeds[i].speed)) {
83			return speeds[i].speed;
84		}
85	} while (++i < NUM_SPEEDS);
86
87	return (speed_t) - 1;
88}
89
90#if 0
91/* testing code */
92#include <stdio.h>
93
94int main(void)
95{
96	unsigned long v;
97	speed_t s;
98
99	for (v = 0 ; v < 1000000; v++) {
100		s = tty_value_to_baud(v);
101		if (s == (speed_t) -1) {
102			continue;
103		}
104		printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
105	}
106
107	printf("-------------------------------\n");
108
109	for (s = 0 ; s < 010017+1; s++) {
110		v = tty_baud_to_value(s);
111		if (!v) {
112			continue;
113		}
114		printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
115	}
116
117	return 0;
118}
119#endif
120