busybox/console-tools/dumpkmap.c
Denys Vlasenko e6a2f4cc5a libbb: make bb_common_bufsiz1 1 kbyte, add capability to use bss tail for it
The config item is FEATURE_USE_BSS_TAIL. When it is off (default):

function                                             old     new   delta
read_config                                          210     228     +18
doCommands                                          2279    2294     +15
ipneigh_list_or_flush                                763     772      +9
ipaddr_list_or_flush                                1256    1261      +5
display_process_list                                1301    1306      +5
conspy_main                                         1378    1383      +5
do_lzo_compress                                      352     355      +3
do_lzo_decompress                                    565     567      +2
push                                                  46      44      -2
inetd_main                                          2136    2134      -2
uevent_main                                          421     418      -3
addLines                                              97      92      -5
bb_common_bufsiz1                                   8193    1024   -7169
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 8/5 up/down: 62/-7181)        Total: -7119 bytes
   text	   data	    bss	    dec	    hex	filename
 829850	   4086	   9080	 843016	  cdd08	busybox_old
 829901	   4086	   1904	 835891	  cc133	busybox_unstripped

FEATURE_USE_BSS_TAIL=y:

read_config                                          210     228     +18
doCommands                                          2279    2294     +15
ipneigh_list_or_flush                                763     772      +9
ipaddr_list_or_flush                                1256    1261      +5
display_process_list                                1301    1306      +5
conspy_main                                         1378    1383      +5
do_lzo_compress                                      352     355      +3
do_lzo_decompress                                    565     567      +2
inetd_main                                          2136    2134      -2
bb_common_bufsiz1                                   8193       -   -8193
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 8/1 up/down: 62/-8195)        Total: -8133 bytes
   text	   data	    bss	    dec	    hex	filename
 829850	   4086	   9080	 843016	  cdd08	busybox_old
 829911	   4086	    880	 834877	  cbd3d	busybox_unstripped

FIXME: setup_common_bufsiz() calls are missing.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-04-21 17:39:11 +02:00

93 lines
2.2 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini dumpkmap implementation for busybox
*
* Copyright (C) Arne Bernin <arne@matrix.loopback.org>
*
* 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"
#include "common_bufsiz.h"
/* From <linux/kd.h> */
struct kbentry {
unsigned char kb_table;
unsigned char kb_index;
unsigned short kb_value;
};
#define KDGKBENT 0x4B46 /* gets one entry in translation table */
/* From <linux/keyboard.h> */
#define NR_KEYS 128
#define MAX_NR_KEYMAPS 256
int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int dumpkmap_main(int argc UNUSED_PARAM, char **argv)
{
struct kbentry ke;
int i, j, fd;
#define flags bb_common_bufsiz1
/* 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();
#if 0
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); - already is */
memset(flags, 0x01, 13);
flags[3] = flags[7] = flags[11] = 0;
/* dump flags */
write(STDOUT_FILENO, flags, MAX_NR_KEYMAPS);
#define flags7 flags
#else
/* Same effect */
/* 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)
#endif
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(KDGKBENT{%d,%d}) failed",
j, i)
) {
write(STDOUT_FILENO, &ke.kb_value, 2);
}
}
}
}
if (ENABLE_FEATURE_CLEAN_UP) {
close(fd);
}
return EXIT_SUCCESS;
}