shithub: map

ref: 99e6eda7182651155b2baa3957242898fa489f37
dir: /gps.c/

#include <u.h>
#include <libc.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"

GPos
getlocation()
{
	int fd;
	GPos ret;
	char buf[256];
	char *fields[9];
	int n, quality;
	char *nop;
	
	ret.lon = 180.;
	ret.lat = 90.;
	
	fd = open("/mnt/gps/position", OREAD);
	if (fd < 0) {
		debugprint("unable to open gps: %r\n");
		return ret;
	}
	
	if ((n = read(fd, buf, 256)) <= 0) {
		fprint(2, "read error: %r\n");
		close(fd);
		return ret;
	}
	close(fd);
	buf[n] = 0;
	
	quality = atoi(buf);
	if (!quality)
		return ret;
	
	if (getfields(buf, fields, 9, 1, " 	") != 9) {
		fprint(2, "read error: invalid fields\n");
		return ret;
	}
	
	ret.lon = 180 + strtod(fields[3], &nop);
	ret.lat = 90 + strtod(fields[4], &nop);
	debugprint("GPS: %f %f\n", ret.lon, ret.lat);
	return ret;
}