Catch unsupported features

1 files changed, 15 insertions, 7 deletions

diff --git a/archival/tar.c b/archival/tar.c
index 72b4c9952..bee24d84b 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -596,6 +596,7 @@ static llist_t *append_file_list_to_list(llist_t *list)
 
 
 static const char tar_options[]="ctxjT:X:C:f:Opvz";
+
 #define CTX_CREATE      1
 #define CTX_TEST        2
 #define CTX_EXTRACT     4
@@ -670,21 +671,28 @@ int tar_main(int argc, char **argv)
                                 tar_handle->action_header = header_list;
                         }
         }
-#ifdef CONFIG_FEATURE_TAR_GZIP
+
         if(opt & TAR_OPT_GZIP) {
-                        get_header_ptr = get_header_tar_gz;
-        }
+#ifdef CONFIG_FEATURE_TAR_GZIP
+                get_header_ptr = get_header_tar_gz;
+#else
+                bb_show_usage();
 #endif
-#ifdef CONFIG_FEATURE_TAR_BZIP2
+        }
         if(opt & TAR_OPT_BZIP2) {
+#ifdef CONFIG_FEATURE_TAR_BZIP2
                         get_header_ptr = get_header_tar_bz2;
-        }
+#else
+                bb_show_usage();
 #endif
-#ifdef CONFIG_FEATURE_TAR_EXCLUDE
+        }
         if(opt & TAR_OPT_EXCLUDE) {
+#ifdef CONFIG_FEATURE_TAR_EXCLUDE
                 tar_handle->reject = append_file_list_to_list(tar_handle->reject);
-        }
+#else
+                bb_show_usage();
 #endif
+        }
         /* Check if we are reading from stdin */
         if ((argv[optind]) && (*argv[optind] == '-')) {
                 /* Default is to read from stdin, so just skip to next arg */