Catch unsupported features

diff --git a/archival/tar.c b/archival/tar.c
index 72b4c99..bee24d8 100644 (file)
--- 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 */