| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * compact speed_t <-> speed functions for busybox
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| 4 | *
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| 5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 8 | */
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| 9 |
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| 10 | #include <termios.h>
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| 11 | #include "libbb.h"
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| 12 |
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| 13 | struct speed_map {
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| 14 | unsigned short speed;
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| 15 | unsigned short value;
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| 16 | };
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| 17 |
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| 18 | static const struct speed_map speeds[] = {
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| 19 | {B0, 0},
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| 20 | {B50, 50},
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| 21 | {B75, 75},
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| 22 | {B110, 110},
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| 23 | {B134, 134},
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| 24 | {B150, 150},
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| 25 | {B200, 200},
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| 26 | {B300, 300},
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| 27 | {B600, 600},
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| 28 | {B1200, 1200},
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| 29 | {B1800, 1800},
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| 30 | {B2400, 2400},
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| 31 | {B4800, 4800},
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| 32 | {B9600, 9600},
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| 33 | #ifdef B19200
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| 34 | {B19200, 19200},
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| 35 | #elif defined(EXTA)
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| 36 | {EXTA, 19200},
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| 37 | #endif
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| 38 | #ifdef B38400
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| 39 | {B38400, 38400/256 + 0x8000U},
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| 40 | #elif defined(EXTB)
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| 41 | {EXTB, 38400/256 + 0x8000U},
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| 42 | #endif
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| 43 | #ifdef B57600
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| 44 | {B57600, 57600/256 + 0x8000U},
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| 45 | #endif
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| 46 | #ifdef B115200
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| 47 | {B115200, 115200/256 + 0x8000U},
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| 48 | #endif
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| 49 | #ifdef B230400
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| 50 | {B230400, 230400/256 + 0x8000U},
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| 51 | #endif
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| 52 | #ifdef B460800
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| 53 | {B460800, 460800/256 + 0x8000U},
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| 54 | #endif
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| 55 | };
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| 56 |
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| 57 | enum { NUM_SPEEDS = (sizeof(speeds) / sizeof(struct speed_map)) };
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| 58 |
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| 59 | unsigned int tty_baud_to_value(speed_t speed)
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| 60 | {
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| 61 | int i = 0;
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| 62 |
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| 63 | do {
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| 64 | if (speed == speeds[i].speed) {
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| 65 | if (speeds[i].value & 0x8000U) {
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| 66 | return ((unsigned long) (speeds[i].value) & 0x7fffU) * 256;
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| 67 | }
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| 68 | return speeds[i].value;
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| 69 | }
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| 70 | } while (++i < NUM_SPEEDS);
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| 71 |
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| 72 | return 0;
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| 73 | }
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| 74 |
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| 75 | speed_t tty_value_to_baud(unsigned int value)
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| 76 | {
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| 77 | int i = 0;
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| 78 |
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| 79 | do {
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| 80 | if (value == tty_baud_to_value(speeds[i].speed)) {
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| 81 | return speeds[i].speed;
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| 82 | }
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| 83 | } while (++i < NUM_SPEEDS);
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| 84 |
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| 85 | return (speed_t) - 1;
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| 86 | }
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| 87 |
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| 88 | #if 0
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| 89 | /* testing code */
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| 90 | #include <stdio.h>
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| 91 |
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| 92 | int main(void)
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| 93 | {
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| 94 | unsigned long v;
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| 95 | speed_t s;
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| 96 |
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| 97 | for (v = 0 ; v < 500000 ; v++) {
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| 98 | s = tty_value_to_baud(v);
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| 99 | if (s == (speed_t) -1) {
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| 100 | continue;
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| 101 | }
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| 102 | printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
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| 103 | }
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| 104 |
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| 105 | printf("-------------------------------\n");
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| 106 |
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| 107 | for (s = 0 ; s < 010017+1 ; s++) {
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| 108 | v = tty_baud_to_value(s);
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| 109 | if (!v) {
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| 110 | continue;
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| 111 | }
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| 112 | printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
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| 113 | }
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| 114 |
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| 115 | return 0;
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| 116 | }
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| 117 | #endif
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