kc3-lang/libxkbcommon/test/interactive.c

Branch : - branch - android master - tag -

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• Author : Ran Benita
  Date : 2012-10-11 16:54:17
  Hash : bbf388ec
  Message : Make xkb_keymap_num_leds return the index range instead of active count Currently xkb_keymap_num_leds() returns a count of valid (settable) leds. Because the indexes might be non-consecutive, and some leds might not be settable, it is incorrect to use this function for iterating over the leds in the keymap. But this is the main use case of this function, so instead of the current behavior we adapt the function to the use case by making it return the needed range of iteration. The caller needs to handle invalid intermittent indexes, though. Signed-off-by: Ran Benita <ran234@gmail.com>

• test/interactive.c

• /*
   * 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;
  
  #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 *xkb, 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(xkb);
      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 group;
      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
  
      printf("groups [ ");
      for (group = 0; group < xkb_keymap_num_layouts(keymap); group++) {
          if (!xkb_state_layout_index_is_active(state, group, XKB_STATE_EFFECTIVE))
              continue;
          printf("%s (%d) ", xkb_keymap_layout_get_name(keymap, group), group);
      }
      printf("] ");
  
      printf("mods [ ");
      for (mod = 0; mod < xkb_keymap_num_mods(keymap); mod++) {
          if (!xkb_state_mod_index_is_active(state, mod, XKB_STATE_EFFECTIVE))
              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");
  }
  
  /* 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;
  
      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)
          xkb_state_update_key(kbd->state, keycode, XKB_KEY_UP);
      else
          xkb_state_update_key(kbd->state, keycode, XKB_KEY_DOWN);
  }
  
  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:")) != -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 '?':
              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");
              exit(EX_USAGE);
          }
      }
  
      ctx = test_get_context();
      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);
  }