Cleaned up error reporting in decoder.

lib/c/labcomm_decoder.c

@@ -202,9 +202,8 @@ static int decode_typedef_or_sample(struct labcomm_decoder *d, int kind)
 		     LABCOMM_IOCTL_WRITER_GET_BYTES_WRITTEN,
 		     &signature.size);
   if (err < 0) {
-	printf("Failed to get size: %s\n", strerror(-err));
-    /* labcomm_error_fatal_global(LABCOMM_ERROR_BAD_WRITER, */
-    /* 			  "Failed to get size: %s\n", strerror(-err)); */
+    d->on_error(LABCOMM_ERROR_BAD_WRITER, 2,
+		"Failed to get size: %s\n", strerror(-err));
     result = -ENOENT;
     goto free_signature_name;
   }
@@ -212,9 +211,8 @@ static int decode_typedef_or_sample(struct labcomm_decoder *d, int kind)
 		     LABCOMM_IOCTL_WRITER_GET_BYTE_POINTER,
 		     &signature.signature);
   if (err < 0) {
-    printf("Failed to get pointer: %s\n", strerror(-err));
-    /* labcomm_error_fatal_global(LABCOMM_ERROR_BAD_WRITER, */
-    /* 			  "Failed to get pointer: %s\n", strerror(-err)); */
+    d->on_error(LABCOMM_ERROR_BAD_WRITER, 2,
+		"Failed to get pointer: %s\n", strerror(-err));
     result = -ENOENT;
     goto free_signature_name;
   }

lib/c/labcomm_error.c

@@ -27,6 +27,6 @@ void labcomm_error_fatal_global(enum labcomm_error error,
 				char *format,
 				...)
 {
-  printf("Fatal error %d\n", error);
+  fprintf(stderr, "Fatal error %d\n", error);
   exit(1);
 }