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mygps3.c
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mygps3.c
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// gcc -o mygps mygps.c -lm -lgps
#include <gps.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
#include <stdlib.h>
char gps_text[1000];
void get_gps_text(){
time_t aclock;
struct gps_data_t gps_data;
// opens the daemon socket
if (gps_open(GPSD_SHARED_MEMORY, NULL, &gps_data) != 0) {
(void)sprintf(gps_text, "gpsd: no gpsd running or network error: %d, %s\n",
errno, gps_errstr(errno));
} else {
// Blocking read for gps data from the daemon socket
gps_read(&gps_data);
// Start collecting text
sprintf(gps_text, "GPS data - ");
// fix cps conditions
switch (gps_data.fix.mode) {
case MODE_3D:
sprintf(gps_text, "%s3d-fix", gps_text);
break;
case MODE_2D:
sprintf(gps_text, "%s2d-fix", gps_text);
break;
case MODE_NO_FIX:
sprintf(gps_text, "%sno-fix", gps_text);
break;
default:
sprintf(gps_text, "%sempty-fix", gps_text);
break;
}
// gps position
sprintf(gps_text, "%s, lat: %f°", gps_text, gps_data.fix.latitude);
sprintf(gps_text, "%s%c, ", gps_text,
(gps_data.fix.latitude < 0) ? 'S' : 'N');
sprintf(gps_text, "%slon: %f°", gps_text, gps_data.fix.longitude);
sprintf(gps_text, "%s%c, ", gps_text,
(gps_data.fix.longitude < 0) ? 'W' : 'E');
// gps speed
sprintf(gps_text, "%sspeed: %.2f km/h, ", gps_text,
3.6 * gps_data.fix.speed);
// local gps time
aclock = gps_data.fix.time;
sprintf(gps_text, "%stime: %s", gps_text, ctime(&aclock));
}
gps_close(&gps_data);
}
int main(void) {
get_gps_text();
printf("%s\n",gps_text);
}