flash_eraseall: implement -N

[oweals/busybox.git] / console-tools / dumpkmap.c

diff --git a/console-tools/dumpkmap.c b/console-tools/dumpkmap.c
index 061fc4792c1fec9e06b39ed898c304d3ac43d7f0..6b923d2d47bd4f9bd8d2152fe12f31f1eaa8ed3d 100644 (file)
--- a/console-tools/dumpkmap.c
+++ b/console-tools/dumpkmap.c
@@ -4,11 +4,19 @@
  *
  * Copyright (C) Arne Bernin <arne@matrix.loopback.org>
  *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  *
  */
 /* no options, no getopt */
 
+//usage:#define dumpkmap_trivial_usage
+//usage:       "> keymap"
+//usage:#define dumpkmap_full_usage "\n\n"
+//usage:       "Print a binary keyboard translation table to stdout"
+//usage:
+//usage:#define dumpkmap_example_usage
+//usage:       "$ dumpkmap > keymap\n"
+
 #include "libbb.h"
 
 /* From <linux/kd.h> */
@@ -24,12 +32,17 @@ struct kbentry {
 #define MAX_NR_KEYMAPS 256
 
 int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int dumpkmap_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
 {
        struct kbentry ke;
        int i, j, fd;
        RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);
 
+       /* When user accidentally runs "dumpkmap FILE"
+        * instead of "dumpkmap >FILE", we'd dump binary stuff to tty.
+        * Let's prevent it: */
+       if (argv[1])
+               bb_show_usage();
 /*     bb_warn_ignoring_args(argv[1]);*/
 
        fd = get_console_fd_or_die();