busybox/libbb/speed_table.c

/* vi: set sw=4 ts=4: */
/*
 * compact speed_t <-> speed functions for busybox
 *
 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <termios.h>
#include "libbb.h"

struct speed_map {
	unsigned short speed;
	unsigned short value;
};

static const struct speed_map speeds[] = {
	{B0, 0},
	{B50, 50},
	{B75, 75},
	{B110, 110},
	{B134, 134},
	{B150, 150},
	{B200, 200},
	{B300, 300},
	{B600, 600},
	{B1200, 1200},
	{B1800, 1800},
	{B2400, 2400},
	{B4800, 4800},
	{B9600, 9600},
#ifdef	B19200
	{B19200, 19200},
#elif defined(EXTA)
	{EXTA, 19200},
#endif
#ifdef	B38400
	{B38400, 38400/256 + 0x8000U},
#elif defined(EXTB)
	{EXTB, 38400/256 + 0x8000U},
#endif
#ifdef B57600
	{B57600, 57600/256 + 0x8000U},
#endif
#ifdef B115200
	{B115200, 115200/256 + 0x8000U},
#endif
#ifdef B230400
	{B230400, 230400/256 + 0x8000U},
#endif
#ifdef B460800
	{B460800, 460800/256 + 0x8000U},
#endif
};

enum { NUM_SPEEDS = ARRAY_SIZE(speeds) };

unsigned FAST_FUNC tty_baud_to_value(speed_t speed)
{
	int i = 0;

	do {
		if (speed == speeds[i].speed) {
			if (speeds[i].value & 0x8000U) {
				return ((unsigned long) (speeds[i].value) & 0x7fffU) * 256;
			}
			return speeds[i].value;
		}
	} while (++i < NUM_SPEEDS);

	return 0;
}

speed_t FAST_FUNC tty_value_to_baud(unsigned int value)
{
	int i = 0;

	do {
		if (value == tty_baud_to_value(speeds[i].speed)) {
			return speeds[i].speed;
		}
	} while (++i < NUM_SPEEDS);

	return (speed_t) - 1;
}

#if 0
/* testing code */
#include <stdio.h>

int main(void)
{
	unsigned long v;
	speed_t s;

	for (v = 0 ; v < 500000; v++) {
		s = tty_value_to_baud(v);
		if (s == (speed_t) -1) {
			continue;
		}
		printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
	}

	printf("-------------------------------\n");

	for (s = 0 ; s < 010017+1; s++) {
		v = tty_baud_to_value(s);
		if (!v) {
			continue;
		}
		printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
	}

	return 0;
}
#endif
1	niro	532	/* 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
13			struct speed_map {
14			unsigned short speed;
15			unsigned short value;
16			};
17
18			static 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
57	niro	816	enum { NUM_SPEEDS = ARRAY_SIZE(speeds) };
58	niro	532
59	niro	816	unsigned FAST_FUNC tty_baud_to_value(speed_t speed)
60	niro	532	{
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
75	niro	816	speed_t FAST_FUNC tty_value_to_baud(unsigned int value)
76	niro	532	{
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
88			#if 0
89			/* testing code */
90			#include <stdio.h>
91
92			int main(void)
93			{
94			unsigned long v;
95			speed_t s;
96
97	niro	816	for (v = 0 ; v < 500000; v++) {
98	niro	532	s = tty_value_to_baud(v);
99			if (s == (speed_t) -1) {
100			continue;
101			}
102			printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
103			}
104
105			printf("-------------------------------\n");
106
107	niro	816	for (s = 0 ; s < 010017+1; s++) {
108	niro	532	v = tty_baud_to_value(s);
109			if (!v) {
110			continue;
111			}
112			printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
113			}
114
115			return 0;
116			}
117			#endif