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/* 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 tarball for details.
*/
#include "libbb.h"
struct speed_map {
unsigned short speed;
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
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