| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini loadkmap implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1998 Enrique Zanardi <ezanardi@ull.es>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 |
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| 10 | //usage:#define loadkmap_trivial_usage
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| 11 | //usage: "< keymap"
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| 12 | //usage:#define loadkmap_full_usage "\n\n"
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| 13 | //usage: "Load a binary keyboard translation table from stdin"
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| 14 | ////usage: "\n"
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| 15 | ////usage: "\n -C TTY Affect TTY instead of /dev/tty"
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| 16 | //usage:
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| 17 | //usage:#define loadkmap_example_usage
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| 18 | //usage: "$ loadkmap < /etc/i18n/lang-keymap\n"
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| 19 |
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| 20 | #include "libbb.h"
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| 21 |
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| 22 | #define BINARY_KEYMAP_MAGIC "bkeymap"
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| 23 |
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| 24 | /* From <linux/kd.h> */
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| 25 | struct kbentry {
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| 26 | unsigned char kb_table;
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| 27 | unsigned char kb_index;
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| 28 | unsigned short kb_value;
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| 29 | };
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| 30 | /* sets one entry in translation table */
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| 31 | #define KDSKBENT 0x4B47
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| 32 |
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| 33 | /* From <linux/keyboard.h> */
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| 34 | #define NR_KEYS 128
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| 35 | #define MAX_NR_KEYMAPS 256
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| 36 |
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| 37 | int loadkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 38 | int loadkmap_main(int argc UNUSED_PARAM, char **argv)
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| 39 | {
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| 40 | struct kbentry ke;
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| 41 | int i, j, fd;
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| 42 | uint16_t ibuff[NR_KEYS];
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| 43 | /* const char *tty_name = CURRENT_TTY; */
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| 44 | RESERVE_CONFIG_BUFFER(flags, MAX_NR_KEYMAPS);
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| 45 |
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| 46 | /* When user accidentally runs "loadkmap FILE"
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| 47 | * instead of "loadkmap <FILE", we end up waiting for input from tty.
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| 48 | * Let's prevent it: */
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| 49 | if (argv[1])
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| 50 | bb_show_usage();
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| 51 | /* bb_warn_ignoring_args(argv[1]); */
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| 52 |
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| 53 | fd = get_console_fd_or_die();
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| 54 | /* or maybe:
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| 55 | opt = getopt32(argv, "C:", &tty_name);
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| 56 | fd = xopen_nonblocking(tty_name);
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| 57 | */
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| 58 |
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| 59 | xread(STDIN_FILENO, flags, 7);
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| 60 | if (!is_prefixed_with(flags, BINARY_KEYMAP_MAGIC))
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| 61 | bb_error_msg_and_die("not a valid binary keymap");
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| 62 |
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| 63 | xread(STDIN_FILENO, flags, MAX_NR_KEYMAPS);
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| 64 |
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| 65 | for (i = 0; i < MAX_NR_KEYMAPS; i++) {
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| 66 | if (flags[i] != 1)
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| 67 | continue;
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| 68 | xread(STDIN_FILENO, ibuff, NR_KEYS * sizeof(uint16_t));
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| 69 | for (j = 0; j < NR_KEYS; j++) {
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| 70 | ke.kb_index = j;
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| 71 | ke.kb_table = i;
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| 72 | ke.kb_value = ibuff[j];
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| 73 | /*
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| 74 | * Note: table[idx:0] can contain special value
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| 75 | * K_ALLOCATED (marks allocated tables in kernel).
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| 76 | * dumpkmap saves the value as-is; but attempts
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| 77 | * to load it here fail, since it isn't a valid
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| 78 | * key value: it is K(KT_SPEC,126) == 2<<8 + 126,
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| 79 | * whereas last valid KT_SPEC is
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| 80 | * K_BARENUMLOCK == K(KT_SPEC,19).
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| 81 | * So far we just ignore these errors:
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| 82 | */
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| 83 | ioctl(fd, KDSKBENT, &ke);
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| 84 | }
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| 85 | }
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| 86 |
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| 87 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 88 | close(fd);
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| 89 | RELEASE_CONFIG_BUFFER(flags);
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| 90 | }
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| 91 | return EXIT_SUCCESS;
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| 92 | }
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