| 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 source tree.
|
|---|
| 8 | */
|
|---|
| 9 |
|
|---|
| 10 | #include "libbb.h"
|
|---|
| 11 |
|
|---|
| 12 | struct speed_map {
|
|---|
| 13 | #if defined __FreeBSD__
|
|---|
| 14 | /* On FreeBSD, B<num> constants don't fit into a short */
|
|---|
| 15 | unsigned speed;
|
|---|
| 16 | #else
|
|---|
| 17 | unsigned short speed;
|
|---|
| 18 | #endif
|
|---|
| 19 | unsigned short value;
|
|---|
| 20 | };
|
|---|
| 21 |
|
|---|
| 22 | static const struct speed_map speeds[] = {
|
|---|
| 23 | {B0, 0},
|
|---|
| 24 | {B50, 50},
|
|---|
| 25 | {B75, 75},
|
|---|
| 26 | {B110, 110},
|
|---|
| 27 | {B134, 134},
|
|---|
| 28 | {B150, 150},
|
|---|
| 29 | {B200, 200},
|
|---|
| 30 | {B300, 300},
|
|---|
| 31 | {B600, 600},
|
|---|
| 32 | {B1200, 1200},
|
|---|
| 33 | {B1800, 1800},
|
|---|
| 34 | {B2400, 2400},
|
|---|
| 35 | {B4800, 4800},
|
|---|
| 36 | {B9600, 9600},
|
|---|
| 37 | #ifdef B19200
|
|---|
| 38 | {B19200, 19200},
|
|---|
| 39 | #elif defined(EXTA)
|
|---|
| 40 | {EXTA, 19200},
|
|---|
| 41 | #endif
|
|---|
| 42 | #ifdef B38400
|
|---|
| 43 | {B38400, 38400/256 + 0x8000U},
|
|---|
| 44 | #elif defined(EXTB)
|
|---|
| 45 | {EXTB, 38400/256 + 0x8000U},
|
|---|
| 46 | #endif
|
|---|
| 47 | #ifdef B57600
|
|---|
| 48 | {B57600, 57600/256 + 0x8000U},
|
|---|
| 49 | #endif
|
|---|
| 50 | #ifdef B115200
|
|---|
| 51 | {B115200, 115200/256 + 0x8000U},
|
|---|
| 52 | #endif
|
|---|
| 53 | #ifdef B230400
|
|---|
| 54 | {B230400, 230400/256 + 0x8000U},
|
|---|
| 55 | #endif
|
|---|
| 56 | #ifdef B460800
|
|---|
| 57 | {B460800, 460800/256 + 0x8000U},
|
|---|
| 58 | #endif
|
|---|
| 59 | #ifdef B921600
|
|---|
| 60 | {B921600, 921600/256 + 0x8000U},
|
|---|
| 61 | #endif
|
|---|
| 62 | };
|
|---|
| 63 |
|
|---|
| 64 | enum { NUM_SPEEDS = ARRAY_SIZE(speeds) };
|
|---|
| 65 |
|
|---|
| 66 | unsigned FAST_FUNC tty_baud_to_value(speed_t speed)
|
|---|
| 67 | {
|
|---|
| 68 | int i = 0;
|
|---|
| 69 |
|
|---|
| 70 | do {
|
|---|
| 71 | if (speed == speeds[i].speed) {
|
|---|
| 72 | if (speeds[i].value & 0x8000U) {
|
|---|
| 73 | return ((unsigned long) (speeds[i].value) & 0x7fffU) * 256;
|
|---|
| 74 | }
|
|---|
| 75 | return speeds[i].value;
|
|---|
| 76 | }
|
|---|
| 77 | } while (++i < NUM_SPEEDS);
|
|---|
| 78 |
|
|---|
| 79 | return 0;
|
|---|
| 80 | }
|
|---|
| 81 |
|
|---|
| 82 | speed_t FAST_FUNC tty_value_to_baud(unsigned int value)
|
|---|
| 83 | {
|
|---|
| 84 | int i = 0;
|
|---|
| 85 |
|
|---|
| 86 | do {
|
|---|
| 87 | if (value == tty_baud_to_value(speeds[i].speed)) {
|
|---|
| 88 | return speeds[i].speed;
|
|---|
| 89 | }
|
|---|
| 90 | } while (++i < NUM_SPEEDS);
|
|---|
| 91 |
|
|---|
| 92 | return (speed_t) - 1;
|
|---|
| 93 | }
|
|---|
| 94 |
|
|---|
| 95 | #if 0
|
|---|
| 96 | /* testing code */
|
|---|
| 97 | #include <stdio.h>
|
|---|
| 98 |
|
|---|
| 99 | int main(void)
|
|---|
| 100 | {
|
|---|
| 101 | unsigned long v;
|
|---|
| 102 | speed_t s;
|
|---|
| 103 |
|
|---|
| 104 | for (v = 0 ; v < 1000000; v++) {
|
|---|
| 105 | s = tty_value_to_baud(v);
|
|---|
| 106 | if (s == (speed_t) -1) {
|
|---|
| 107 | continue;
|
|---|
| 108 | }
|
|---|
| 109 | printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
|
|---|
| 110 | }
|
|---|
| 111 |
|
|---|
| 112 | printf("-------------------------------\n");
|
|---|
| 113 |
|
|---|
| 114 | for (s = 0 ; s < 010017+1; s++) {
|
|---|
| 115 | v = tty_baud_to_value(s);
|
|---|
| 116 | if (!v) {
|
|---|
| 117 | continue;
|
|---|
| 118 | }
|
|---|
| 119 | printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
|
|---|
| 120 | }
|
|---|
| 121 |
|
|---|
| 122 | return 0;
|
|---|
| 123 | }
|
|---|
| 124 | #endif
|
|---|
