104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini loadkmap implementation for busybox
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*
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* Copyright (C) 1998 Enrique Zanardi <ezanardi@ull.es>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config LOADKMAP
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//config: bool "loadkmap"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: This program loads a keyboard translation table from
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//config: standard input.
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//applet:IF_LOADKMAP(APPLET(loadkmap, BB_DIR_SBIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_LOADKMAP) += loadkmap.o
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//usage:#define loadkmap_trivial_usage
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//usage: "< keymap"
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//usage:#define loadkmap_full_usage "\n\n"
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//usage: "Load a binary keyboard translation table from stdin"
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////usage: "\n"
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////usage: "\n -C TTY Affect TTY instead of /dev/tty"
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//usage:
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//usage:#define loadkmap_example_usage
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//usage: "$ loadkmap < /etc/i18n/lang-keymap\n"
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#include "libbb.h"
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#define BINARY_KEYMAP_MAGIC "bkeymap"
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/* From <linux/kd.h> */
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struct kbentry {
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unsigned char kb_table;
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unsigned char kb_index;
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unsigned short kb_value;
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};
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/* sets one entry in translation table */
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#define KDSKBENT 0x4B47
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/* From <linux/keyboard.h> */
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#define NR_KEYS 128
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#define MAX_NR_KEYMAPS 256
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int loadkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int loadkmap_main(int argc UNUSED_PARAM, char **argv)
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{
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struct kbentry ke;
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int i, j, fd;
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uint16_t ibuff[NR_KEYS];
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/* const char *tty_name = CURRENT_TTY; */
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RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);
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/* When user accidentally runs "loadkmap FILE"
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* instead of "loadkmap <FILE", we end up waiting for input from tty.
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* Let's prevent it: */
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if (argv[1])
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bb_show_usage();
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/* bb_warn_ignoring_args(argv[1]); */
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fd = get_console_fd_or_die();
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/* or maybe:
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opt = getopt32(argv, "C:", &tty_name);
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fd = xopen_nonblocking(tty_name);
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*/
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xread(STDIN_FILENO, flags, 7);
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if (!is_prefixed_with(flags, BINARY_KEYMAP_MAGIC))
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bb_error_msg_and_die("not a valid binary keymap");
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xread(STDIN_FILENO, flags, MAX_NR_KEYMAPS);
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for (i = 0; i < MAX_NR_KEYMAPS; i++) {
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if (flags[i] != 1)
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continue;
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xread(STDIN_FILENO, ibuff, NR_KEYS * sizeof(uint16_t));
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for (j = 0; j < NR_KEYS; j++) {
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ke.kb_index = j;
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ke.kb_table = i;
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ke.kb_value = ibuff[j];
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/*
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* Note: table[idx:0] can contain special value
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* K_ALLOCATED (marks allocated tables in kernel).
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* dumpkmap saves the value as-is; but attempts
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* to load it here fail, since it isn't a valid
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* key value: it is K(KT_SPEC,126) == 2<<8 + 126,
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* whereas last valid KT_SPEC is
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* K_BARENUMLOCK == K(KT_SPEC,19).
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* So far we just ignore these errors:
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*/
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ioctl(fd, KDSKBENT, &ke);
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(fd);
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RELEASE_CONFIG_BUFFER(flags);
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}
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return EXIT_SUCCESS;
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}
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