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 = ARRAY_SIZE(speeds) };
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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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