add label filter

README.md

@@ -36,6 +36,8 @@ It allows the user to directly monitor to up to 8 different frequencies simultan
 
  -i station id:		id use in acarsdec network format.
 
+ -b filter:		filter output by label (ex: -b "H1:Q0" : only output messages  with label H1 or Q0"
+
 for the RTLSDR device
 
  -r rtldevice f1 [f2] ... [fN] :		decode from rtl dongle number or S/N "rtldevice" receiving at VHF frequencies "f1" and optionally "f2" to "fN" in Mhz (ie : -r 0 131.525 131.725 131.825 ). Frequencies must be within the same 2MHz.

acarsdec.c

@@ -28,6 +28,7 @@
 #include <libacars/version.h>
 #endif
 #include "acarsdec.h"
+extern void build_label_filter(char *arg);
 
 channel_t channel[MAXNBCHANNELS];
 unsigned int nbch;
@@ -147,11 +148,13 @@ int main(int argc, char **argv)
 	int res, n;
 	struct sigaction sigact;
 	char sys_hostname[8];
+	char *lblf=NULL;
+
 	gethostname(sys_hostname, sizeof(sys_hostname));
 	idstation = strndup(sys_hostname, 8);
 
 	res = 0;
-	while ((c = getopt(argc, argv, "varfsRo:t:g:Ap:n:N:j:l:c:i:L:G:")) != EOF) {
+	while ((c = getopt(argc, argv, "varfsRo:t:g:Ap:n:N:j:l:c:i:L:G:b:")) != EOF) {
 
 		switch (c) {
 		case 'v':
@@ -163,6 +166,9 @@ int main(int argc, char **argv)
 		case 't':
 			mdly = atoi(optarg);
 			break;
+		case 'b':
+			lblf=optarg;
+			break;
 #ifdef WITH_ALSA
 		case 'a':
 			res = initAlsa(argv, optind);
@@ -248,6 +254,8 @@ int main(int argc, char **argv)
 		exit(res);
 	}
 
+	build_label_filter(lblf);
+
 	res = initOutput(logfilename, Rawaddr);
 	if (res) {
 		fprintf(stderr, "Unable to init output\n");

label.c

@@ -4,7 +4,38 @@
 #include <string.h>
 #include "acarsdec.h"
 
+static char *lblfilter[1024];
 
+void build_label_filter(char *arg)
+{
+   int i=0;
+   char *aptr;
+
+   lblfilter[0]=NULL;
+   if(arg==NULL) return;
+
+   aptr=strtok(strdup(arg),":");
+   while(aptr) {
+	lblfilter[i]=aptr; i++;
+	aptr=strtok(NULL,":");
+	}
+   lblfilter[i]=NULL;
+}
+
+int label_filter(char *lbl)
+{
+   int i;
+
+    if(lblfilter[0]==NULL) return 1;
+
+   i=0;
+   while(lblfilter[i]) {
+	if(strcmp(lbl,lblfilter[i])==0) return 1;
+	i++;
+   }
+
+   return 0;
+}
 
 static int label_q1(char *txt,oooi_t *oooi)
 {

output.c

@@ -14,6 +14,7 @@
 #endif
 #include "acarsdec.h"
 #include "cJSON.h"
+extern int label_filter(char *lbl);
 
 extern int inmode;
 extern char *idstation;
@@ -558,6 +559,9 @@ void outputmsg(const msgblk_t * blk)
 	/* txt end */
 	msg.be = blk->txt[blk->len - 1];
 
+
+	if(label_filter(msg.label)==0) return;
+
 	if(outflg)
 		fl=addFlight(&msg,blk->chn,blk->tv);