write gpsd.json when using gpsd_in

for each message with lat / lon received from gpsd, the message is
written as is to gpsd.json

net_io.c

@@ -3577,6 +3577,12 @@ static int handle_gpsd(struct client *c, char *p, int remote, int64_t now, struc
  fprintf(stderr, " gpsdebug: received from GPSD: \'%s\'\n", p);
  }
 
+ struct char_buffer msg;
+ msg.alloc = strlen(p) + 128;
+ msg.buffer = cmalloc(msg.alloc);
+ sprintf(msg.buffer, "%s\n", p);
+ msg.len = strlen(msg.buffer);
+
  // remove spaces in place
  char *d = p;
  char *s = p;
@@ -3592,7 +3598,7 @@ static int handle_gpsd(struct client *c, char *p, int remote, int64_t now, struc
  if (Modes.debug_gps) {
  fprintf(stderr, "gpsdebug: class \"TPV\" : ignoring message.\n");
  }
- return 0;
+ goto exit;
  }
  // filter all messages which don't have lat / lon
  char *latp = strstr(p, "\"lat\":");
@@ -3602,7 +3608,7 @@ static int handle_gpsd(struct client *c, char *p, int remote, int64_t now, struc
  if (Modes.debug_gps) {
  fprintf(stderr, "gpsdebug: lat / lon not present: ignoring message.\n");
  }
- return 0;
+ goto exit;
  }
  latp += 6;
  lonp += 6;
@@ -3637,13 +3643,13 @@ static int handle_gpsd(struct client *c, char *p, int remote, int64_t now, struc
  if (Modes.debug_gps) {
  fprintf(stderr, "gpsdebug: lat lon implausible, ignoring\n");
  }
- return 0;
+ goto exit;
  }
  if (fabs(lat) < 0.1 && fabs(lon) < 0.1) {
  if (Modes.debug_gps) {
  fprintf(stderr, "gpsdebug: lat lon implausible, ignoring\n");
  }
- return 0;
+ goto exit;
  }
 
  if (Modes.debug_gps) {
@@ -3659,8 +3665,13 @@ static int handle_gpsd(struct client *c, char *p, int remote, int64_t now, struc
 
  if (Modes.json_dir) {
  free(writeJsonToFile(Modes.json_dir, "receiver.json", generateReceiverJson()).buffer); // location changed
+ if (msg.len) {
+ writeJsonToFile(Modes.json_dir, "gpsd.json", msg);
+ }
  }
 
+exit:
+ free(msg.buffer);
  return 0;
 }