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/*
* This file is Copyright (c)2010 by the GPSD project
* BSD terms apply: see the file COPYING in the distribution root for details.
*/
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <limits.h>
/*
* @@Cj - receiver ID
* @@Be 0 - almanac dump
*/
static int moto_send(int , char *, char *);
static char moto_gen_checksum(char *, int);
char *gpsd_hexdump(char *, size_t);
int gpsd_hexpack(char *, char *, int);
int hex2bin(char *s);
#define BSIZ 64
int main(int argc, char **argv) {
int speed, l, fd, n;
struct termios term;
char buf[BSIZ];
time_t s, t;
if (argc != 5){
fprintf(stderr, "usage: motosend <speed> <port> msgtype moto-body-hex\n");
return 1;
}
if ((l = strlen(argv[4])) > 2*USHRT_MAX){
fprintf(stderr, "oversized message\n");
return 1;
}
if (l % 2) {
fprintf(stderr, "body must have an even number of hex digits\n");
return 1;
}
speed = atoi(argv[1]);
switch (speed) {
case 230400:
case 115200:
case 57600:
case 38400:
case 28800:
case 14400:
case 9600:
case 4800:
break;
default:
fprintf(stderr, "invalid speed\n");
return 1;
}
if ((fd = open(argv[2], O_RDWR | O_NONBLOCK | O_NOCTTY, 0644)) == -1)
err(1, "open");
tcgetattr(fd, &term);
cfmakeraw(&term);
cfsetospeed(&term, speed);
cfsetispeed(&term, speed);
term.c_cc[VMIN] = 8;
term.c_cc[VTIME] = 1;
term.c_cflag &= ~(PARENB | PARODD | CRTSCTS);
term.c_cflag |= CREAD | CLOCAL;
term.c_iflag = term.c_oflag = term.c_lflag = (tcflag_t) 0;
if (tcsetattr(fd, TCSANOW | TCSAFLUSH, &term) == -1)
err(1, "tcsetattr");
tcflush(fd, TCIOFLUSH);
t = 0; n = 0;
while (1){
usleep(1000);
bzero(buf, BSIZ);
if ((l = read(fd, buf, BSIZ)) == -1)
if (!(EINTR == errno || EAGAIN == errno))
err(1, "read");
if (l > 0){
printf("%s", gpsd_hexdump(buf, l));
fflush(stdout);
}
/* allow for up to "n" resends, once per second */
if (((s = time(NULL)) > t) && (n < 1)){
t = s;
n++;
moto_send(fd, argv[3], argv[4]);
}
}
return 0;
}
char moto_gen_checksum(char *buf, int len){
int n;
char ck = '\0';
for (n = 0; n < len; n++)
ck ^= buf[n];
return ck;
}
static int moto_send(int fd, char *type, char *body ) {
size_t status;
char *buf;
unsigned short l;
l = strlen(body) / 2;
if ((buf = malloc(l+7)) == NULL)
return -1;
bzero(buf, l+7);
buf[0] = '@'; buf[1] = '@';
buf[2] = type[0]; buf[3] = type[1];
if (l)
if (gpsd_hexpack(body, buf+4, l) == -1){
free(buf);
return -1;
}
buf[l+4] = moto_gen_checksum(buf+2, l+2);
buf[l+5] = '\r'; buf[l+6] = '\n';
status = write(fd, buf, l+7);
if (status == -1)
perror("moto_send");
return (int)status;
}
static char last;
char *gpsd_hexdump(char *binbuf, size_t binbuflen)
{
static char hexbuf[USHRT_MAX*2+10+2];
size_t i, j = 0;
size_t len = (size_t)binbuflen;
const char *ibuf = (const char *)binbuf;
const char *hexchar = "0123456789abcdef";
for (i = 0; i < len; i++) {
if (ibuf[i] == '@' && (ibuf[i+1] == '@' || last == '@')){
hexbuf[j++] = '\n';
hexbuf[j++] = ibuf[i++];
hexbuf[j++] = ibuf[i++];
hexbuf[j++] = ibuf[i++];
hexbuf[j++] = ibuf[i++];
} else {
hexbuf[j++] = hexchar[ (ibuf[i]&0xf0)>>4 ];
hexbuf[j++] = hexchar[ ibuf[i]&0x0f ];
}
last = ibuf[i];
}
hexbuf[j] ='\0';
return hexbuf;
}
int gpsd_hexpack(char *src, char *dst, int len)
{
int i, l;
l = (int)(strlen(src) / 2);
if ((l < 1) || (l > len))
return -1;
bzero(dst, len);
for (i = 0; i < l; i++) {
int k;
if ((k = hex2bin(src+i*2)) != -1)
dst[i] = (char)(k & 0xff);
else
return -1;
}
return l;
}
int hex2bin(char *s)
{
int a, b;
a = s[0] & 0xff;
b = s[1] & 0xff;
if ((a >= 'a') && (a <= 'f'))
a = a + 10 - 'a';
else if ((a >= 'A') && (a <= 'F'))
a = a + 10 - 'A';
else if ((a >= '0') && (a <= '9'))
a -= '0';
else
return -1;
if ((b >= 'a') && (b <= 'f'))
b = b + 10 - 'a';
else if ((b >= 'A') && (b <= 'F'))
b = b + 10 - 'A';
else if ((b >= '0') && (b <= '9'))
b -= '0';
else
return -1;
return ((a<<4) + b);
}
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