bc: prepare for char-by-char input handling

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

diff --git a/console-tools/dumpkmap.c b/console-tools/dumpkmap.c
index 301a90674a71cff51d23f8c2e546da66ab5d85a4..f1c9287b5e9349cce2442a001680985ee698bf81 100644 (file)
--- a/console-tools/dumpkmap.c
+++ b/console-tools/dumpkmap.c
@@ -5,11 +5,30 @@
  * Copyright (C) Arne Bernin <arne@matrix.loopback.org>
  *
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
- *
  */
-/* no options, no getopt */
+//config:config DUMPKMAP
+//config:      bool "dumpkmap (1.3 kb)"
+//config:      default y
+//config:      select PLATFORM_LINUX
+//config:      help
+//config:      This program dumps the kernel's keyboard translation table to
+//config:      stdout, in binary format. You can then use loadkmap to load it.
+
+//applet:IF_DUMPKMAP(APPLET_NOEXEC(dumpkmap, dumpkmap, BB_DIR_BIN, BB_SUID_DROP, dumpkmap))
+/* bb_common_bufsiz1 usage here is safe wrt NOEXEC: not expecting it to be zeroed. */
+
+//kbuild:lib-$(CONFIG_DUMPKMAP) += dumpkmap.o
+
+//usage:#define dumpkmap_trivial_usage
+//usage:       "> keymap"
+//usage:#define dumpkmap_full_usage "\n\n"
+//usage:       "Print a binary keyboard translation table to stdout"
+//usage:
+//usage:#define dumpkmap_example_usage
+//usage:       "$ dumpkmap > keymap\n"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 /* From <linux/kd.h> */
 struct kbentry {
@@ -28,47 +47,43 @@ 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: */
+        * Let's prevent it:
+        */
        if (argv[1])
                bb_show_usage();
 /*     bb_warn_ignoring_args(argv[1]);*/
 
        fd = get_console_fd_or_die();
 
-       write(STDOUT_FILENO, "bkeymap", 7);
-
-       /* Here we want to set everything to 0 except for indexes:
-        * [0-2] [4-6] [8-10] [12] */
-       memset(flags, 0x00, MAX_NR_KEYMAPS);
-       memset(flags, 0x01, 13);
-       flags[3] = flags[7] = flags[11] = 0;
-
-       /* dump flags */
-       write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);
+#define flags bb_common_bufsiz1
+       setup_common_bufsiz();
+       /*                     0 1 2 3 4 5 6 7 8 9 a b c=12 */
+       memcpy(flags, "bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1",
+       /* Can use sizeof, or sizeof-1. sizeof is even, using that */
+       /****/ sizeof("bkeymap\1\1\1\0\1\1\1\0\1\1\1\0\1")
+       );
+       write(STDOUT_FILENO, flags, 7 + MAX_NR_KEYMAPS);
+#define flags7 (flags + 7)
 
-       for (i = 0; i < MAX_NR_KEYMAPS; i++) {
-               if (flags[i] == 1) {
+       for (i = 0; i < 13; i++) {
+               if (flags7[i]) {
                        for (j = 0; j < NR_KEYS; j++) {
                                ke.kb_index = j;
                                ke.kb_table = i;
                                if (!ioctl_or_perror(fd, KDGKBENT, &ke,
-                                               "ioctl failed with %s, %s, %p",
-                                               (char *)&ke.kb_index,
-                                               (char *)&ke.kb_table,
-                                               &ke.kb_value)
+                                               "ioctl(KDGKBENT{%d,%d}) failed",
+                                               j, i)
                                ) {
-                                       write(STDOUT_FILENO, (void*)&ke.kb_value, 2);
+                                       write(STDOUT_FILENO, &ke.kb_value, 2);
                                }
                        }
                }
        }
        if (ENABLE_FEATURE_CLEAN_UP) {
                close(fd);
-               RELEASE_CONFIG_BUFFER(flags);
        }
        return EXIT_SUCCESS;
 }