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#include <stdio.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include <assert.h>
#include <linux/input.h>
#include "keymap.h"
/* Mysteriously missing defines from <linux/input.h>. */
#define EV_MAKE 1
#define EV_BREAK 0
#define EV_REPEAT 2
/* Default US keymap */
static wchar_t char_keys[49] = L"1234567890-=qwertyuiop[]asdfghjkl;'`\\zxcvbnm,./<";
static wchar_t shift_keys[49] = L"!@#$%^&*()_+QWERTYUIOP{}ASDFGHJKL:\"~|ZXCVBNM<>?>";
static wchar_t altgr_keys[49] = {0};
static wchar_t func_keys[][8] = {
L"<Esc>", L"<BckSp>", L"<Tab>", L"<Enter>", L"<LCtrl>", L"<LShft>",
L"<RShft>", L"<KP*>", L"<LAlt>", L" ", L"<CpsLk>", L"<F1>", L"<F2>",
L"<F3>", L"<F4>", L"<F5>", L"<F6>", L"<F7>", L"<F8>", L"<F9>", L"<F10>",
L"<NumLk>", L"<ScrLk>", L"<KP7>", L"<KP8>", L"<KP9>", L"<KP->", L"<KP4>",
L"<KP5>", L"<KP6>", L"<KP+>", L"<KP1>", L"<KP2>", L"<KP3>", L"<KP0>",
L"<KP.>", /*"<",*/ L"<F11>", L"<F12>", L"<KPEnt>", L"<RCtrl>", L"<KP/>",
L"<PrtSc>", L"<AltGr>", L"<Break>" /*linefeed?*/, L"<Home>", L"<Up>",
L"<PgUp>", L"<Left>", L"<Right>", L"<End>", L"<Down>", L"<PgDn>",
L"<Ins>", L"<Del>", L"<Pause>", L"<LMeta>", L"<RMeta>", L"<Menu>"
};
/* c = character key
* f = function key
* _ = blank/error
*
* Source: KEY_* defines from <linux/input.h>
*/
static const char char_or_func[] =
"_fccccccccccccff"
"ccccccccccccffcc"
"ccccccccccfccccc"
"ccccccffffffffff"
"ffffffffffffffff"
"ffff__cff_______"
"ffffffffffffffff"
"_______f_____fff";
static int is_char_key(unsigned int code)
{
assert(code < sizeof(char_or_func));
return char_or_func[code] == 'c';
}
static int is_func_key(unsigned int code)
{
assert(code < sizeof(char_or_func));
return char_or_func[code] == 'f';
}
static int is_used_key(unsigned int code)
{
assert(code < sizeof(char_or_func));
return char_or_func[code] != '_';
}
/* Translates character keycodes to continuous array indexes. */
static int to_char_keys_index(unsigned int keycode)
{
if (keycode >= KEY_1 && keycode <= KEY_EQUAL) // keycodes 2-13: US keyboard: 1, 2, ..., 0, -, =
return keycode - 2;
if (keycode >= KEY_Q && keycode <= KEY_RIGHTBRACE) // keycodes 16-27: q, w, ..., [, ]
return keycode - 4;
if (keycode >= KEY_A && keycode <= KEY_GRAVE) // keycodes 30-41: a, s, ..., ', `
return keycode - 6;
if (keycode >= KEY_BACKSLASH && keycode <= KEY_SLASH) // keycodes 43-53: \, z, ..., ., /
return keycode - 7;
if (keycode == KEY_102ND) // key right to the left of 'Z' on US layout
return 47;
return -1; // not character keycode
}
/* Translates function keys keycodes to continuous array indexes. */
static int to_func_keys_index(unsigned int keycode)
{
if (keycode == KEY_ESC) // 1
return 0;
if (keycode >= KEY_BACKSPACE && keycode <= KEY_TAB) // 14-15
return keycode - 13;
if (keycode >= KEY_ENTER && keycode <= KEY_LEFTCTRL) // 28-29
return keycode - 25;
if (keycode == KEY_LEFTSHIFT) // 42
return keycode - 37;
if (keycode >= KEY_RIGHTSHIFT && keycode <= KEY_KPDOT) // 54-83
return keycode - 48;
if (keycode >= KEY_F11 && keycode <= KEY_F12) // 87-88
return keycode - 51;
if (keycode >= KEY_KPENTER && keycode <= KEY_DELETE) // 96-111
return keycode - 58;
if (keycode == KEY_PAUSE) // 119
return keycode - 65;
if (keycode >= KEY_LEFTMETA && keycode <= KEY_COMPOSE) // 125-127
return keycode - 70;
return -1; // not function key keycode
}
/* Translates struct input_event *event into the string of size buffer_length
* pointed to by buffer. Stores state originating from sequence of event structs
* in struc input_event_state *state. Returns the number of bytes written to buffer.
*/
size_t translate_event(struct input_event *event, struct input_event_state *state, char *buffer, size_t buffer_len)
{
wchar_t wch, *wbuffer;
size_t wbuffer_len, len;
len = 0;
wbuffer = (wchar_t*)buffer;
wbuffer_len = buffer_len / sizeof(wchar_t);
if (event->type != EV_KEY)
goto out;
if (event->code >= sizeof(char_or_func)) {
len += swprintf(&wbuffer[len], wbuffer_len, L"<E-%x>", event->code);
goto out;
}
if (event->value == EV_MAKE || event->value == EV_REPEAT) {
if (event->code == KEY_LEFTSHIFT || event->code == KEY_RIGHTSHIFT) {
state->shift = 1;
goto out;
} else if (event->code == KEY_RIGHTALT) {
state->altgr = 1;
goto out;
} else if (event->code == KEY_LEFTALT) {
state->alt = 1;
goto out;
} else if (event->code == KEY_LEFTCTRL || event->code == KEY_RIGHTCTRL) {
state->ctrl = 1;
goto out;
} else if (event->code == KEY_LEFTMETA || event->code == KEY_RIGHTMETA) {
state->meta = 1;
goto out;
} else {
if (state->ctrl && state->alt && state->meta)
len += swprintf(&wbuffer[len], wbuffer_len, L"<CTRL,ALT,META>+");
else if (state->ctrl && state->alt)
len += swprintf(&wbuffer[len], wbuffer_len, L"<CTRL,ALT>+");
else if (state->alt && state->meta)
len += swprintf(&wbuffer[len], wbuffer_len, L"<ALT,META>+");
else if (state->ctrl && state->meta)
len += swprintf(&wbuffer[len], wbuffer_len, L"<CTRL,META>+");
else if (state->meta)
len += swprintf(&wbuffer[len], wbuffer_len, L"<META>+");
else if (state->ctrl)
len += swprintf(&wbuffer[len], wbuffer_len, L"<CTRL>+");
else if (state->alt)
len += swprintf(&wbuffer[len], wbuffer_len, L"<ALT>+");
}
if (is_char_key(event->code)) {
if (state->altgr) {
wch = altgr_keys[to_char_keys_index(event->code)];
if (wch == L'\0') {
if (state->shift)
wch = shift_keys[to_char_keys_index(event->code)];
else
wch = char_keys[to_char_keys_index(event->code)];
}
}
else if (state->shift) {
wch = shift_keys[to_char_keys_index(event->code)];
if (wch == L'\0')
wch = char_keys[to_char_keys_index(event->code)];
}
else
wch = char_keys[to_char_keys_index(event->code)];
if (wch != L'\0') {
len += swprintf(&wbuffer[len], wbuffer_len, L"%lc", wch);
goto out;
}
}
else if (is_func_key(event->code)) {
len += swprintf(&wbuffer[len], wbuffer_len, L"%ls", func_keys[to_func_keys_index(event->code)]);
goto out;
}
else {
len += swprintf(&wbuffer[len], wbuffer_len, L"<E-%x>", event->code);
goto out;
}
}
if (event->value == EV_BREAK) {
if (event->code == KEY_LEFTSHIFT || event->code == KEY_RIGHTSHIFT)
state->shift = 0;
else if (event->code == KEY_RIGHTALT)
state->altgr = 0;
else if (event->code == KEY_LEFTALT)
state->alt = 0;
else if (event->code == KEY_LEFTCTRL || event->code == KEY_RIGHTCTRL)
state->ctrl = 0;
else if (event->code == KEY_LEFTMETA || event->code == KEY_RIGHTMETA)
state->meta = 0;
}
out:
if (!len)
*buffer = 0;
else
wcstombs(buffer, wbuffer, buffer_len);
return len;
}
/* Determines the system keymap via the dump keys program
* and some disgusting parsing of it. */
int load_system_keymap()
{
FILE *dumpkeys;
char buffer[256];
char *start, *end;
unsigned int keycode;
int index;
wchar_t wch;
/* HACK: This is obscenely ugly, and we should really just do this in C... */
dumpkeys = popen("/usr/bin/dumpkeys -n | /bin/grep '^\\([[:space:]]shift[[:space:]]\\)*\\([[:space:]]altgr[[:space:]]\\)*keycode' | /bin/sed 's/U+/0x/g' 2>&1", "r");
if (!dumpkeys) {
perror("popen");
return 1;
}
memset(char_keys, 0, sizeof(char_keys));
memset(shift_keys, 0, sizeof(shift_keys));
memset(altgr_keys, 0, sizeof(altgr_keys));
for (keycode = 1; fgets(buffer, sizeof(buffer), dumpkeys)
&& keycode < sizeof(char_or_func); ++keycode) {
if (!is_char_key(keycode))
continue;
if (buffer[0] == 'k') {
index = to_char_keys_index(keycode);
start = &buffer[14];
wch = (wchar_t)strtoul(start, &end, 16);
if (start[0] == '+' && (wch & 0xB00))
wch ^= 0xB00;
char_keys[index] = wch;
start = end;
while (start[0] == ' ' && start[0] != '\0')
++start;
wch = (wchar_t)strtoul(start, &end, 16);
if (start[0] == '+' && (wch & 0xB00))
wch ^= 0xB00;
if (wch == L'\0') {
wch = towupper(char_keys[index]);
if (wch == char_keys[index])
wch = L'\0';
}
shift_keys[index] = wch;
start = end;
while (start[0] == ' ' && start[0] != '\0')
++start;
wch = (wchar_t)strtoul(start, &end, 16);
if (start[0] == '+' && (wch & 0xB00))
wch ^= 0xB00;
altgr_keys[index] = wch;
} else {
index = to_char_keys_index(keycode == 0 ? 0 : --keycode);
wch = (wchar_t)strtoul(&buffer[21], NULL, 16);
if (buffer[21] == '+' && (wch & 0xB00))
wch ^= 0xB00;
if (buffer[1] == 's')
shift_keys[index] = wch;
else if (buffer[1] == 'a')
altgr_keys[index] = wch;
}
}
pclose(dumpkeys);
return 0;
}
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