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 <termios.h> 11#include "libbb.h" 12 13struct speed_map { 14 unsigned short speed; 15 unsigned short value; 16}; 17 18static 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 57enum { NUM_SPEEDS = ARRAY_SIZE(speeds) }; 58 59unsigned int tty_baud_to_value(speed_t speed) 60{ 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 75speed_t tty_value_to_baud(unsigned int value) 76{ 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