Fix up example programs somewhat

src/Makefile

@@ -13,7 +13,7 @@ HEADERS		= kiss.h ax25.h ax25/if.h ax25/macros.h ax25/proto.h \
 OBJS		= kiss.o ax25.o if.o address.o frame.o list.o hash.o dict.o \
 		  test.o
 
-PROGRAM		= test
+EXAMPLES	= test decode
 
 AR		= $(CROSS)ar
 RANLIB		= $(CROSS)ranlib
@@ -23,10 +23,10 @@ LN		= /bin/ln
 RMDIR		= /bin/rmdir
 INSTALL		= /usr/bin/install
 
-all: $(PROGRAM)
+all: $(EXAMPLES)
 
-$(PROGRAM): $(OBJS)
+$(EXAMPLES): %: %.c $(OBJS)
-	$(CC) $(LDFLAGS) $(OBJS) -o $(PROGRAM)
+	$(CC) $(LDFLAGS) $(OBJS) -o $@
 
 $(OBJS): %.o: %.c $(HEADERS_BUILD)
 	$(CC) $(CFLAGS) -c $<

src/decode.c

@@ -0,0 +1,93 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <patty/kiss.h>
+#include <patty/ax25.h>
+
+static void usage(int argc, char **argv, const char *message, ...) {
+    if (message) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+         fprintf(stderr, "\n");
+        va_end(args);
+    }
+
+    fprintf(stderr, "usage: %s kiss.cap\n", argv[0]);
+
+    exit(1);
+}
+
+static int callsign_fprint(FILE *stream, const patty_ax25_address *address) {
+    fprintf(stream, "%s", address->callsign);
+
+    if (address->ssid) {
+        fprintf(stream, "/%d", address->ssid);
+    }
+
+    return 0;
+}
+
+static int address_fprint(FILE *stream, const patty_ax25_frame *frame) {
+    int i;
+
+    callsign_fprint(stream, &frame->src);
+    fprintf(stream, " > ");
+    callsign_fprint(stream, &frame->dest);
+
+    for (i=0; i<frame->hops; i++) {
+        fprintf(stream, " < ");
+        callsign_fprint(stream, &frame->repeaters[i]);
+    }
+
+    return 0;
+}
+
+int main(int argc, char **argv) {
+    patty_kiss_tnc *tnc;
+    ssize_t len;
+    void *data;
+    int port;
+
+    if (argc != 2) {
+        usage(argc, argv, "No TNC device provided");
+    }
+
+    if ((tnc = patty_kiss_tnc_open(argv[1], 330)) == NULL) {
+        perror("Unable to open TNC");
+
+        exit(127);
+    }
+
+    while ((len = patty_kiss_tnc_recv(tnc, &data, &port)) > 0) {
+        patty_ax25_frame frame;
+
+        if (patty_ax25_frame_decode(&frame, data, len) < 0) {
+            perror("Unable to decode frame");
+
+            exit(127);
+        }
+
+        address_fprint(stderr, &frame);
+
+        if (frame.type == PATTY_AX25_FRAME_INFO) {
+            fprintf(stderr, " poll %d", PATTY_AX25_CONTROL_POLL(frame.control));
+            fprintf(stderr, " ns %d",   PATTY_AX25_CONTROL_SEQ_SEND(frame.control));
+            fprintf(stderr, " nr %d",   PATTY_AX25_CONTROL_SEQ_RECV(frame.control));
+        }
+
+        if (frame.payload) {
+            fprintf(stderr, " proto %02x", frame.proto);
+        }
+
+        fprintf(stderr, " %ld bytes\n", len);
+    }
+
+    patty_kiss_tnc_close(tnc);
+
+    return 0;
+}

src/test.c

@@ -17,7 +17,7 @@ static void usage(int argc, char **argv, const char *message, ...) {
         va_end(args);
     }
 
-    fprintf(stderr, "usage: %s kiss.cap\n", argv[0]);
+    fprintf(stderr, "usage: %s device\n", argv[0]);
 
     exit(1);
 }
@@ -35,10 +35,11 @@ int iface_callback(patty_ax25_if *iface, void *ctx) {
 int main(int argc, char **argv) {
     patty_ax25 ax25;
     patty_ax25_if *iface;
-    patty_ax25_event ev;
 
-    if (argc != 2) {
+    if (argc < 2) {
         usage(argc, argv, "No TNC device provided");
+    } else if (argc > 2) {
+        usage(argc, argv, NULL);
     }
 
     if (patty_ax25_init(&ax25) < 0) {
@@ -65,10 +66,7 @@ int main(int argc, char **argv) {
         exit(127);
     }
 
-    if (patty_ax25_next_event(&ax25, &ev) >= 0) {
+    patty_ax25_each_if(&ax25, iface_callback, NULL);
-        printf("Got event %d on fd %d\n",
-            ev.type, ev.fd);
-    }
 
     patty_ax25_stop(&ax25);