libxkbcommon/test/interactive.c

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/*
* Copyright © 2012 Ran Benita <ran234@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <limits.h>
#include <locale.h>
#include <signal.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <linux/input.h>
#include "test.h"
struct keyboard {
char *path;
int fd;
struct xkb_state *state;
struct keyboard *next;
};
static bool terminate;
static int evdev_offset = 8;
static bool report_state_changes;
#define NLONGS(n) (((n) + LONG_BIT - 1) / LONG_BIT)
static bool
evdev_bit_is_set(const unsigned long *array, int bit)
{
return !!(array[bit / LONG_BIT] & (1LL << (bit % LONG_BIT)));
}
/* Some heuristics to see if the device is a keyboard. */
static bool
is_keyboard(int fd)
{
int i;
unsigned long evbits[NLONGS(EV_CNT)] = { 0 };
unsigned long keybits[NLONGS(KEY_CNT)] = { 0 };
errno = 0;
ioctl(fd, EVIOCGBIT(0, sizeof(evbits)), evbits);
if (errno)
return false;
if (!evdev_bit_is_set(evbits, EV_KEY))
return false;
errno = 0;
ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits);
if (errno)
return false;
for (i = KEY_RESERVED; i <= KEY_MIN_INTERESTING; i++)
if (evdev_bit_is_set(keybits, i))
return true;
return false;
}
static int
keyboard_new(struct dirent *ent, struct xkb_keymap *keymap,
struct keyboard **out)
{
int ret;
char *path;
int fd;
struct xkb_state *state;
struct keyboard *kbd;
ret = asprintf(&path, "/dev/input/%s", ent->d_name);
if (ret < 0)
return -ENOMEM;
fd = open(path, O_NONBLOCK | O_CLOEXEC | O_RDONLY);
if (fd < 0) {
ret = -errno;
goto err_path;
}
if (!is_keyboard(fd)) {
/* Dummy "skip this device" value. */
ret = -ENOTSUP;
goto err_fd;
}
state = xkb_state_new(keymap);
if (!state) {
fprintf(stderr, "Couldn't create xkb state for %s\n", path);
ret = -EFAULT;
goto err_fd;
}
kbd = calloc(1, sizeof(*kbd));
if (!kbd) {
ret = -ENOMEM;
goto err_state;
}
kbd->path = path;
kbd->fd = fd;
kbd->state = state;
*out = kbd;
return 0;
err_state:
xkb_state_unref(state);
err_fd:
close(fd);
err_path:
free(path);
return ret;
}
static void
keyboard_free(struct keyboard *kbd)
{
if (!kbd)
return;
if (kbd->fd >= 0)
close(kbd->fd);
free(kbd->path);
xkb_state_unref(kbd->state);
free(kbd);
}
static int
filter_device_name(const struct dirent *ent)
{
return !fnmatch("event*", ent->d_name, 0);
}
static struct keyboard *
get_keyboards(struct xkb_keymap *keymap)
{
int ret, i, nents;
struct dirent **ents;
struct keyboard *kbds = NULL, *kbd = NULL;
nents = scandir("/dev/input", &ents, filter_device_name, alphasort);
if (nents < 0) {
fprintf(stderr, "Couldn't scan /dev/input: %s\n", strerror(errno));
return NULL;
}
for (i = 0; i < nents; i++) {
ret = keyboard_new(ents[i], keymap, &kbd);
if (ret) {
if (ret == -EACCES) {
fprintf(stderr, "Couldn't open /dev/input/%s: %s. "
"You probably need root to run this.\n",
ents[i]->d_name, strerror(-ret));
break;
}
if (ret != -ENOTSUP) {
fprintf(stderr, "Couldn't open /dev/input/%s: %s. Skipping.\n",
ents[i]->d_name, strerror(-ret));
}
continue;
}
kbd->next = kbds;
kbds = kbd;
}
if (!kbds) {
fprintf(stderr, "Couldn't find any keyboards I can use! Quitting.\n");
goto err;
}
err:
for (i = 0; i < nents; i++)
free(ents[i]);
free(ents);
return kbds;
}
static void
free_keyboards(struct keyboard *kbds)
{
struct keyboard *next;
while (kbds) {
next = kbds->next;
keyboard_free(kbds);
kbds = next;
}
}
static void
print_keycode(struct keyboard *kbd, xkb_keycode_t keycode)
{
unsigned int i;
struct xkb_keymap *keymap;
struct xkb_state *state;
const xkb_keysym_t *syms;
unsigned int nsyms;
char s[16];
uint32_t unicode;
xkb_layout_index_t layout;
xkb_mod_index_t mod;
xkb_led_index_t led;
state = kbd->state;
keymap = xkb_state_get_keymap(state);
nsyms = xkb_state_key_get_syms(state, keycode, &syms);
if (nsyms <= 0)
return;
printf("keysyms [ ");
for (i = 0; i < nsyms; i++) {
xkb_keysym_get_name(syms[i], s, sizeof(s));
printf("%-*s ", (int)sizeof(s), s);
}
printf("] ");
/*
* Only do this if wchar_t is UCS-4, so we can be lazy and print
* with %lc.
*/
#ifdef __STDC_ISO_10646__
printf("unicode [ ");
for (i = 0; i < nsyms; i++) {
unicode = xkb_keysym_to_utf32(syms[i]);
printf("%lc ", (int)(unicode ? unicode : L' '));
}
printf("] ");
#endif
layout = xkb_state_key_get_layout(state, keycode);
printf("layout [ %s (%d) ] ",
xkb_keymap_layout_get_name(keymap, layout), layout);
printf("level [ %d ] ",
xkb_state_key_get_level(state, keycode, layout));
printf("mods [ ");
for (mod = 0; mod < xkb_keymap_num_mods(keymap); mod++) {
if (xkb_state_mod_index_is_active(state, mod,
XKB_STATE_MODS_EFFECTIVE) <= 0)
continue;
if (xkb_state_mod_index_is_consumed(state, keycode, mod))
printf("-%s ", xkb_keymap_mod_get_name(keymap, mod));
else
printf("%s ", xkb_keymap_mod_get_name(keymap, mod));
}
printf("] ");
printf("leds [ ");
for (led = 0; led < xkb_keymap_num_leds(keymap); led++) {
if (xkb_state_led_index_is_active(state, led) <= 0)
continue;
printf("%s ", xkb_keymap_led_get_name(keymap, led));
}
printf("] ");
printf("\n");
}
static void
print_state_changes(enum xkb_state_component changed)
{
if (changed == 0)
return;
printf("changed [ ");
if (changed & XKB_STATE_LAYOUT_EFFECTIVE)
printf("effective-layout ");
if (changed & XKB_STATE_LAYOUT_DEPRESSED)
printf("depressed-layout ");
if (changed & XKB_STATE_LAYOUT_LATCHED)
printf("latched-layout ");
if (changed & XKB_STATE_LAYOUT_LOCKED)
printf("locked-layout ");
if (changed & XKB_STATE_MODS_EFFECTIVE)
printf("effective-mods ");
if (changed & XKB_STATE_MODS_DEPRESSED)
printf("depressed-mods ");
if (changed & XKB_STATE_MODS_LATCHED)
printf("latched-mods ");
if (changed & XKB_STATE_MODS_LOCKED)
printf("locked-mods ");
if (changed & XKB_STATE_LEDS)
printf("leds ");
printf("]\n");
}
/* The meaning of the input_event 'value' field. */
enum {
KEY_STATE_RELEASE = 0,
KEY_STATE_PRESS = 1,
KEY_STATE_REPEAT = 2,
};
static void
process_event(struct keyboard *kbd, uint16_t type, uint16_t code, int32_t value)
{
xkb_keycode_t keycode;
struct xkb_keymap *keymap;
enum xkb_state_component changed;
if (type != EV_KEY)
return;
keycode = evdev_offset + code;
keymap = xkb_state_get_keymap(kbd->state);
if (value == KEY_STATE_REPEAT && !xkb_keymap_key_repeats(keymap, keycode))
return;
if (value != KEY_STATE_RELEASE)
print_keycode(kbd, keycode);
if (value == KEY_STATE_RELEASE)
changed = xkb_state_update_key(kbd->state, keycode, XKB_KEY_UP);
else
changed = xkb_state_update_key(kbd->state, keycode, XKB_KEY_DOWN);
if (report_state_changes)
print_state_changes(changed);
}
static int
read_keyboard(struct keyboard *kbd)
{
size_t i;
ssize_t len;
struct input_event evs[16];
size_t nevs;
/* No fancy error checking here. */
while ((len = read(kbd->fd, &evs, sizeof(evs))) > 0) {
nevs = len / sizeof(struct input_event);
for (i = 0; i < nevs; i++)
process_event(kbd, evs[i].type, evs[i].code, evs[i].value);
}
if (len < 0 && errno != EWOULDBLOCK) {
fprintf(stderr, "Couldn't read %s: %s\n", kbd->path,
strerror(errno));
return -errno;
}
return 0;
}
static int
loop(struct keyboard *kbds)
{
int i, ret;
int epfd;
struct keyboard *kbd;
struct epoll_event ev;
struct epoll_event evs[16];
epfd = epoll_create1(0);
if (epfd < 0) {
fprintf(stderr, "Couldn't create epoll instance: %s\n",
strerror(errno));
return -errno;
}
for (kbd = kbds; kbd; kbd = kbd->next) {
memset(&ev, 0, sizeof(ev));
ev.events = EPOLLIN;
ev.data.ptr = kbd;
ret = epoll_ctl(epfd, EPOLL_CTL_ADD, kbd->fd, &ev);
if (ret) {
ret = -errno;
fprintf(stderr, "Couldn't add %s to epoll: %s\n",
kbd->path, strerror(errno));
goto err_epoll;
}
}
while (!terminate) {
ret = epoll_wait(epfd, evs, 16, -1);
if (ret < 0) {
if (errno == EINTR)
continue;
ret = -errno;
fprintf(stderr, "Couldn't poll for events: %s\n",
strerror(errno));
goto err_epoll;
}
for (i = 0; i < ret; i++) {
kbd = evs[i].data.ptr;
ret = read_keyboard(kbd);
if (ret) {
goto err_epoll;
}
}
}
close(epfd);
return 0;
err_epoll:
close(epfd);
return ret;
}
static void
sigintr_handler(int signum)
{
terminate = true;
}
int
main(int argc, char *argv[])
{
int ret;
int opt;
struct keyboard *kbds;
struct xkb_context *ctx;
struct xkb_keymap *keymap;
const char *rules = NULL;
const char *model = NULL;
const char *layout = NULL;
const char *variant = NULL;
const char *options = NULL;
const char *keymap_path = NULL;
struct sigaction act;
setlocale(LC_ALL, "");
while ((opt = getopt(argc, argv, "r:m:l:v:o:k:n:c")) != -1) {
switch (opt) {
case 'r':
rules = optarg;
break;
case 'm':
model = optarg;
break;
case 'l':
layout = optarg;
break;
case 'v':
variant = optarg;
break;
case 'o':
options = optarg;
break;
case 'k':
keymap_path = optarg;
break;
case 'n':
errno = 0;
evdev_offset = strtol(optarg, NULL, 10);
if (errno) {
fprintf(stderr, "error: -n option expects a number\n");
exit(EXIT_FAILURE);
}
break;
case 'c':
report_state_changes = true;
break;
case '?':
fprintf(stderr, " Usage: %s [-r <rules>] [-m <model>] "
"[-l <layout>] [-v <variant>] [-o <options>]\n",
argv[0]);
fprintf(stderr, " or: %s -k <path to keymap file>\n",
argv[0]);
fprintf(stderr, "For both: -n <evdev keycode offset>\n"
" -c (to report changes to the state)\n");
exit(EX_USAGE);
}
}
ctx = test_get_context(0);
if (!ctx) {
ret = -1;
fprintf(stderr, "Couldn't create xkb context\n");
goto err_out;
}
if (keymap_path) {
FILE *file = fopen(keymap_path, "r");
if (!file) {
ret = EXIT_FAILURE;
fprintf(stderr, "Couldn't open '%s': %s\n",
keymap_path, strerror(errno));
goto err_ctx;
}
keymap = xkb_keymap_new_from_file(ctx, file,
XKB_KEYMAP_FORMAT_TEXT_V1, 0);
fclose(file);
}
else {
keymap = test_compile_rules(ctx, rules, model, layout, variant,
options);
}
if (!keymap) {
ret = -1;
fprintf(stderr, "Couldn't create xkb keymap\n");
goto err_ctx;
}
kbds = get_keyboards(keymap);
if (!kbds) {
ret = -1;
goto err_xkb;
}
act.sa_handler = sigintr_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
/* Instead of fiddling with termios.. */
system("stty -echo");
ret = loop(kbds);
if (ret)
goto err_stty;
err_stty:
system("stty echo");
free_keyboards(kbds);
err_xkb:
xkb_keymap_unref(keymap);
err_ctx:
xkb_context_unref(ctx);
err_out:
exit(ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}