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184 lines
3.8 KiB
C
184 lines
3.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* compact speed_t <-> speed functions for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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struct speed_map {
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#if defined __FreeBSD__ \
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|| (defined B115200 && B115200 > 0xffff) \
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|| (defined B230400 && B230400 > 0xffff) \
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|| (defined B460800 && B460800 > 0xffff) \
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|| (defined B921600 && B921600 > 0xffff) \
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|| (defined B1152000 && B1152000 > 0xffff) \
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|| (defined B1000000 && B1000000 > 0xffff) \
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|| (defined B2000000 && B2000000 > 0xffff) \
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|| (defined B3000000 && B3000000 > 0xffff) \
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|| (defined B4000000 && B4000000 > 0xffff)
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/* On FreeBSD, B<num> constants don't fit into a short */
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unsigned speed;
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#else
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unsigned short speed;
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#endif
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unsigned short value;
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};
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/* On Linux, Bxx constants are 0..15 (up to B38400) and 0x1001..0x100f */
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static const struct speed_map speeds[] = {
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{B0, 0},
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{B50, 50},
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{B75, 75},
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{B110, 110},
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{B134, 134},
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{B150, 150},
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{B200, 200},
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{B300, 300},
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{B600, 600},
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{B1200, 1200},
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{B1800, 1800},
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{B2400, 2400},
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{B4800, 4800},
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{B9600, 9600},
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#ifdef B19200
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{B19200, 19200},
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#elif defined(EXTA)
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{EXTA, 19200},
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#endif
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/* 19200 = 0x4b00 */
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/* 38400 = 0x9600, this value would use bit#15 if not "/200" encoded: */
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#ifdef B38400
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{B38400, 38400/200 + 0x8000u},
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#elif defined(EXTB)
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{EXTB, 38400/200 + 0x8000u},
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#endif
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#ifdef B57600
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{B57600, 57600/200 + 0x8000u},
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#endif
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#ifdef B115200
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{B115200, 115200/200 + 0x8000u},
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#endif
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#ifdef B230400
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{B230400, 230400/200 + 0x8000u},
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#endif
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#ifdef B460800
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{B460800, 460800/200 + 0x8000u},
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#endif
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#ifdef B576000
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{B576000, 576000/200 + 0x8000u},
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#endif
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#ifdef B921600
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{B921600, 921600/200 + 0x8000u},
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#endif
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#ifdef B1152000
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{B1152000, 1152000/200 + 0x8000u},
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#endif
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#ifdef B500000
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{B500000, 500000/200 + 0x8000u},
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#endif
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#ifdef B1000000
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{B1000000, 1000000/200 + 0x8000u},
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#endif
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#ifdef B1500000
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{B1500000, 1500000/200 + 0x8000u},
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#endif
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#ifdef B2000000
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{B2000000, 2000000/200 + 0x8000u},
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#endif
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#ifdef B2500000
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{B2500000, 2500000/200 + 0x8000u},
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#endif
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#ifdef B3000000
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{B3000000, 3000000/200 + 0x8000u},
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#endif
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#ifdef B3500000
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{B3500000, 3500000/200 + 0x8000u},
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#endif
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#ifdef B4000000
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{B4000000, 4000000/200 + 0x8000u},
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#endif
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/* 4000000/200 = 0x4e20, bit#15 still does not interfere with the value */
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/* (can use /800 if higher speeds would appear, /1600 won't work for B500000) */
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};
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/*
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* TODO: maybe we can just bite the bullet, ditch the table and use termios2
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* Linux API (supports arbitrary baud rates, no Bxxxx mess needed)? Example:
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*
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* #include <asm/termios.h>
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* #include <asm/ioctls.h>
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* struct termios2 t;
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* ioctl(fd, TCGETS2, &t);
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* t.c_ospeed = t.c_ispeed = 543210;
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* t.c_cflag &= ~CBAUD;
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* t.c_cflag |= BOTHER;
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* ioctl(fd, TCSETS2, &t);
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*/
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enum { NUM_SPEEDS = ARRAY_SIZE(speeds) };
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unsigned FAST_FUNC tty_baud_to_value(speed_t speed)
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{
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int i = 0;
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do {
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if (speed == speeds[i].speed) {
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if (speeds[i].value & 0x8000u) {
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return ((unsigned)(speeds[i].value) & 0x7fffU) * 200;
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}
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return speeds[i].value;
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}
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} while (++i < NUM_SPEEDS);
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return 0;
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}
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speed_t FAST_FUNC tty_value_to_baud(unsigned int value)
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{
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int i = 0;
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do {
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if (value == tty_baud_to_value(speeds[i].speed)) {
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return speeds[i].speed;
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}
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} while (++i < NUM_SPEEDS);
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return (speed_t) - 1;
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}
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#if 0
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/* testing code */
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#include <stdio.h>
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int main(void)
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{
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unsigned long v;
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speed_t s;
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for (v = 0 ; v < 1000000; v++) {
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s = tty_value_to_baud(v);
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if (s == (speed_t) -1) {
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continue;
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}
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printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
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}
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printf("-------------------------------\n");
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for (s = 0 ; s < 010017+1; s++) {
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v = tty_baud_to_value(s);
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if (!v) {
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continue;
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}
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printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
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}
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return 0;
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}
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#endif
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