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117 lines
1.9 KiB
C
117 lines
1.9 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 tarball for details.
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*/
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#include "libbb.h"
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struct speed_map {
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unsigned short speed;
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unsigned short value;
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};
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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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#ifdef B38400
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{B38400, 38400/256 + 0x8000U},
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#elif defined(EXTB)
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{EXTB, 38400/256 + 0x8000U},
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#endif
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#ifdef B57600
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{B57600, 57600/256 + 0x8000U},
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#endif
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#ifdef B115200
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{B115200, 115200/256 + 0x8000U},
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#endif
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#ifdef B230400
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{B230400, 230400/256 + 0x8000U},
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#endif
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#ifdef B460800
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{B460800, 460800/256 + 0x8000U},
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#endif
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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 long) (speeds[i].value) & 0x7fffU) * 256;
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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 < 500000; 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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