| /* 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 source tree. |
| */ |
| |
| #include "libbb.h" |
| |
| struct speed_map { |
| #if defined __FreeBSD__ |
| /* On FreeBSD, B<num> constants don't fit into a short */ |
| unsigned speed; |
| #else |
| unsigned short speed; |
| #endif |
| 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 |
| #ifdef B921600 |
| {B921600, 921600/256 + 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 < 1000000; 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 |