input-keys.c

   1 /* $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  15  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  16  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <sys/types.h>
  20
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "tmux.h"
  26
  27 /*
  28  * This file is rather misleadingly named, it contains the code which takes a
  29  * key code and translates it into something suitable to be sent to the
  30  * application running in a pane (similar to input.c does in the other
  31  * direction with output).
  32  */
  33
  34 static void      input_key_mouse(struct window_pane *, struct mouse_event *);
  35
  36 /* Entry in the key tree. */
  37 struct input_key_entry {
  38         key_code                         key;
  39         const char                      *data;
  40
  41         RB_ENTRY(input_key_entry)        entry;
  42 };
  43 RB_HEAD(input_key_tree, input_key_entry);
  44
  45 /* Tree of input keys. */
  46 static int      input_key_cmp(struct input_key_entry *,
  47                     struct input_key_entry *);
  48 RB_GENERATE_STATIC(input_key_tree, input_key_entry, entry, input_key_cmp);
  49 struct input_key_tree input_key_tree = RB_INITIALIZER(&input_key_tree);
  50
  51 /* List of default keys, the tree is built from this. */
  52 static struct input_key_entry input_key_defaults[] = {
  53         /* Paste keys. */
  54         { .key = KEYC_PASTE_START,
  55           .data = "\033[200~"
  56         },
  57         { .key = KEYC_PASTE_END,
  58           .data = "\033[201~"
  59         },
  60
  61         /* Function keys. */
  62         { .key = KEYC_F1,
  63           .data = "\033OP"
  64         },
  65         { .key = KEYC_F2,
  66           .data = "\033OQ"
  67         },
  68         { .key = KEYC_F3,
  69           .data = "\033OR"
  70         },
  71         { .key = KEYC_F4,
  72           .data = "\033OS"
  73         },
  74         { .key = KEYC_F5,
  75           .data = "\033[15~"
  76         },
  77         { .key = KEYC_F6,
  78           .data = "\033[17~"
  79         },
  80         { .key = KEYC_F7,
  81           .data = "\033[18~"
  82         },
  83         { .key = KEYC_F8,
  84           .data = "\033[19~"
  85         },
  86         { .key = KEYC_F9,
  87           .data = "\033[20~"
  88         },
  89         { .key = KEYC_F10,
  90           .data = "\033[21~"
  91         },
  92         { .key = KEYC_F11,
  93           .data = "\033[23~"
  94         },
  95         { .key = KEYC_F12,
  96           .data = "\033[24~"
  97         },
  98         { .key = KEYC_IC,
  99           .data = "\033[2~"
 100         },
 101         { .key = KEYC_DC,
 102           .data = "\033[3~"
 103         },
 104         { .key = KEYC_HOME,
 105           .data = "\033[1~"
 106         },
 107         { .key = KEYC_END,
 108           .data = "\033[4~"
 109         },
 110         { .key = KEYC_NPAGE,
 111           .data = "\033[6~"
 112         },
 113         { .key = KEYC_PPAGE,
 114           .data = "\033[5~"
 115         },
 116         { .key = KEYC_BTAB,
 117           .data = "\033[Z"
 118         },
 119
 120         /* Arrow keys. */
 121         { .key = KEYC_UP|KEYC_CURSOR,
 122           .data = "\033OA"
 123         },
 124         { .key = KEYC_DOWN|KEYC_CURSOR,
 125           .data = "\033OB"
 126         },
 127         { .key = KEYC_RIGHT|KEYC_CURSOR,
 128           .data = "\033OC"
 129         },
 130         { .key = KEYC_LEFT|KEYC_CURSOR,
 131           .data = "\033OD"
 132         },
 133         { .key = KEYC_UP,
 134           .data = "\033[A"
 135         },
 136         { .key = KEYC_DOWN,
 137           .data = "\033[B"
 138         },
 139         { .key = KEYC_RIGHT,
 140           .data = "\033[C"
 141         },
 142         { .key = KEYC_LEFT,
 143           .data = "\033[D"
 144         },
 145
 146         /* Keypad keys. */
 147         { .key = KEYC_KP_SLASH|KEYC_KEYPAD,
 148           .data = "\033Oo"
 149         },
 150         { .key = KEYC_KP_STAR|KEYC_KEYPAD,
 151           .data = "\033Oj"
 152         },
 153         { .key = KEYC_KP_MINUS|KEYC_KEYPAD,
 154           .data = "\033Om"
 155         },
 156         { .key = KEYC_KP_SEVEN|KEYC_KEYPAD,
 157           .data = "\033Ow"
 158         },
 159         { .key = KEYC_KP_EIGHT|KEYC_KEYPAD,
 160           .data = "\033Ox"
 161         },
 162         { .key = KEYC_KP_NINE|KEYC_KEYPAD,
 163           .data = "\033Oy"
 164         },
 165         { .key = KEYC_KP_PLUS|KEYC_KEYPAD,
 166           .data = "\033Ok"
 167         },
 168         { .key = KEYC_KP_FOUR|KEYC_KEYPAD,
 169           .data = "\033Ot"
 170         },
 171         { .key = KEYC_KP_FIVE|KEYC_KEYPAD,
 172           .data = "\033Ou"
 173         },
 174         { .key = KEYC_KP_SIX|KEYC_KEYPAD,
 175           .data = "\033Ov"
 176         },
 177         { .key = KEYC_KP_ONE|KEYC_KEYPAD,
 178           .data = "\033Oq"
 179         },
 180         { .key = KEYC_KP_TWO|KEYC_KEYPAD,
 181           .data = "\033Or"
 182         },
 183         { .key = KEYC_KP_THREE|KEYC_KEYPAD,
 184           .data = "\033Os"
 185         },
 186         { .key = KEYC_KP_ENTER|KEYC_KEYPAD,
 187           .data = "\033OM"
 188         },
 189         { .key = KEYC_KP_ZERO|KEYC_KEYPAD,
 190           .data = "\033Op"
 191         },
 192         { .key = KEYC_KP_PERIOD|KEYC_KEYPAD,
 193           .data = "\033On"
 194         },
 195         { .key = KEYC_KP_SLASH,
 196           .data = "/"
 197         },
 198         { .key = KEYC_KP_STAR,
 199           .data = "*"
 200         },
 201         { .key = KEYC_KP_MINUS,
 202           .data = "-"
 203         },
 204         { .key = KEYC_KP_SEVEN,
 205           .data = "7"
 206         },
 207         { .key = KEYC_KP_EIGHT,
 208           .data = "8"
 209         },
 210         { .key = KEYC_KP_NINE,
 211           .data = "9"
 212         },
 213         { .key = KEYC_KP_PLUS,
 214           .data = "+"
 215         },
 216         { .key = KEYC_KP_FOUR,
 217           .data = "4"
 218         },
 219         { .key = KEYC_KP_FIVE,
 220           .data = "5"
 221         },
 222         { .key = KEYC_KP_SIX,
 223           .data = "6"
 224         },
 225         { .key = KEYC_KP_ONE,
 226           .data = "1"
 227         },
 228         { .key = KEYC_KP_TWO,
 229           .data = "2"
 230         },
 231         { .key = KEYC_KP_THREE,
 232           .data = "3"
 233         },
 234         { .key = KEYC_KP_ENTER,
 235           .data = "\n"
 236         },
 237         { .key = KEYC_KP_ZERO,
 238           .data = "0"
 239         },
 240         { .key = KEYC_KP_PERIOD,
 241           .data = "."
 242         },
 243
 244         /* Keys with an embedded modifier. */
 245         { .key = KEYC_F1|KEYC_BUILD_MODIFIERS,
 246           .data = "\033[1;_P"
 247         },
 248         { .key = KEYC_F2|KEYC_BUILD_MODIFIERS,
 249           .data = "\033[1;_Q"
 250         },
 251         { .key = KEYC_F3|KEYC_BUILD_MODIFIERS,
 252           .data = "\033[1;_R"
 253         },
 254         { .key = KEYC_F4|KEYC_BUILD_MODIFIERS,
 255           .data = "\033[1;_S"
 256         },
 257         { .key = KEYC_F5|KEYC_BUILD_MODIFIERS,
 258           .data = "\033[15;_~"
 259         },
 260         { .key = KEYC_F6|KEYC_BUILD_MODIFIERS,
 261           .data = "\033[17;_~"
 262         },
 263         { .key = KEYC_F7|KEYC_BUILD_MODIFIERS,
 264           .data = "\033[18;_~"
 265         },
 266         { .key = KEYC_F8|KEYC_BUILD_MODIFIERS,
 267           .data = "\033[19;_~"
 268         },
 269         { .key = KEYC_F9|KEYC_BUILD_MODIFIERS,
 270           .data = "\033[20;_~"
 271         },
 272         { .key = KEYC_F10|KEYC_BUILD_MODIFIERS,
 273           .data = "\033[21;_~"
 274         },
 275         { .key = KEYC_F11|KEYC_BUILD_MODIFIERS,
 276           .data = "\033[23;_~"
 277         },
 278         { .key = KEYC_F12|KEYC_BUILD_MODIFIERS,
 279           .data = "\033[24;_~"
 280         },
 281         { .key = KEYC_UP|KEYC_BUILD_MODIFIERS,
 282           .data = "\033[1;_A"
 283         },
 284         { .key = KEYC_DOWN|KEYC_BUILD_MODIFIERS,
 285           .data = "\033[1;_B"
 286         },
 287         { .key = KEYC_RIGHT|KEYC_BUILD_MODIFIERS,
 288           .data = "\033[1;_C"
 289         },
 290         { .key = KEYC_LEFT|KEYC_BUILD_MODIFIERS,
 291           .data = "\033[1;_D"
 292         },
 293         { .key = KEYC_HOME|KEYC_BUILD_MODIFIERS,
 294           .data = "\033[1;_H"
 295         },
 296         { .key = KEYC_END|KEYC_BUILD_MODIFIERS,
 297           .data = "\033[1;_F"
 298         },
 299         { .key = KEYC_PPAGE|KEYC_BUILD_MODIFIERS,
 300           .data = "\033[5;_~"
 301         },
 302         { .key = KEYC_NPAGE|KEYC_BUILD_MODIFIERS,
 303           .data = "\033[6;_~"
 304         },
 305         { .key = KEYC_IC|KEYC_BUILD_MODIFIERS,
 306           .data = "\033[2;_~"
 307         },
 308         { .key = KEYC_DC|KEYC_BUILD_MODIFIERS,
 309           .data = "\033[3;_~"
 310         }
 311 };
 312 static const key_code input_key_modifiers[] = {
 313         0,
 314         0,
 315         KEYC_SHIFT,
 316         KEYC_META|KEYC_IMPLIED_META,
 317         KEYC_SHIFT|KEYC_META|KEYC_IMPLIED_META,
 318         KEYC_CTRL,
 319         KEYC_SHIFT|KEYC_CTRL,
 320         KEYC_META|KEYC_IMPLIED_META|KEYC_CTRL,
 321         KEYC_SHIFT|KEYC_META|KEYC_IMPLIED_META|KEYC_CTRL
 322 };
 323
 324 /* Input key comparison function. */
 325 static int
 326 input_key_cmp(struct input_key_entry *ike1, struct input_key_entry *ike2)
 327 {
 328         if (ike1->key < ike2->key)
 329                 return (-1);
 330         if (ike1->key > ike2->key)
 331                 return (1);
 332         return (0);
 333 }
 334
 335 /* Look for key in tree. */
 336 static struct input_key_entry *
 337 input_key_get(key_code key)
 338 {
 339         struct input_key_entry  entry = { .key = key };
 340
 341         return (RB_FIND(input_key_tree, &input_key_tree, &entry));
 342 }
 343
 344 /* Split a character into two UTF-8 bytes. */
 345 static size_t
 346 input_key_split2(u_int c, u_char *dst)
 347 {
 348         if (c > 0x7f) {
 349                 dst[0] = (c >> 6) | 0xc0;
 350                 dst[1] = (c & 0x3f) | 0x80;
 351                 return (2);
 352         }
 353         dst[0] = c;
 354         return (1);
 355 }
 356
 357 /* Build input key tree. */
 358 void
 359 input_key_build(void)
 360 {
 361         struct input_key_entry  *ike, *new;
 362         u_int                    i, j;
 363         char                    *data;
 364         key_code                 key;
 365
 366         for (i = 0; i < nitems(input_key_defaults); i++) {
 367                 ike = &input_key_defaults[i];
 368                 if (~ike->key & KEYC_BUILD_MODIFIERS) {
 369                         RB_INSERT(input_key_tree, &input_key_tree, ike);
 370                         continue;
 371                 }
 372
 373                 for (j = 2; j < nitems(input_key_modifiers); j++) {
 374                         key = (ike->key & ~KEYC_BUILD_MODIFIERS);
 375                         data = xstrdup(ike->data);
 376                         data[strcspn(data, "_")] = '0' + j;
 377
 378                         new = xcalloc(1, sizeof *new);
 379                         new->key = key|input_key_modifiers[j];
 380                         new->data = data;
 381                         RB_INSERT(input_key_tree, &input_key_tree, new);
 382                 }
 383         }
 384
 385         RB_FOREACH(ike, input_key_tree, &input_key_tree) {
 386                 log_debug("%s: 0x%llx (%s) is %s", __func__, ike->key,
 387                     key_string_lookup_key(ike->key, 1), ike->data);
 388         }
 389 }
 390
 391 /* Translate a key code into an output key sequence for a pane. */
 392 int
 393 input_key_pane(struct window_pane *wp, key_code key, struct mouse_event *m)
 394 {
 395         if (log_get_level() != 0) {
 396                 log_debug("writing key 0x%llx (%s) to %%%u", key,
 397                     key_string_lookup_key(key, 1), wp->id);
 398         }
 399
 400         if (KEYC_IS_MOUSE(key)) {
 401                 if (m != NULL && m->wp != -1 && (u_int)m->wp == wp->id)
 402                         input_key_mouse(wp, m);
 403                 return (0);
 404         }
 405         return (input_key(wp->screen, wp->event, key));
 406 }
 407
 408 static void
 409 input_key_write(const char *from, struct bufferevent *bev, const char *data,
 410     size_t size)
 411 {
 412         log_debug("%s: %.*s", from, (int)size, data);
 413         bufferevent_write(bev, data, size);
 414 }
 415
 416 /* Translate a key code into an output key sequence. */
 417 int
 418 input_key(struct screen *s, struct bufferevent *bev, key_code key)
 419 {
 420         struct input_key_entry  *ike;
 421         key_code                 justkey, newkey, outkey;
 422         struct utf8_data         ud;
 423         char                     tmp[64], modifier;
 424
 425         /* Mouse keys need a pane. */
 426         if (KEYC_IS_MOUSE(key))
 427                 return (0);
 428
 429         /* Literal keys go as themselves (can't be more than eight bits). */
 430         if (key & KEYC_LITERAL) {
 431                 ud.data[0] = (u_char)key;
 432                 input_key_write(__func__, bev, &ud.data[0], 1);
 433                 return (0);
 434         }
 435
 436         /* Is this backspace? */
 437         if ((key & KEYC_MASK_KEY) == KEYC_BSPACE) {
 438                 newkey = options_get_number(global_options, "backspace");
 439                 if (newkey >= 0x7f)
 440                         newkey = '\177';
 441                 key = newkey|(key & (KEYC_MASK_MODIFIERS|KEYC_MASK_FLAGS));
 442         }
 443
 444         /*
 445          * If this is a normal 7-bit key, just send it, with a leading escape
 446          * if necessary. If it is a UTF-8 key, split it and send it.
 447          */
 448         justkey = (key & ~(KEYC_META|KEYC_IMPLIED_META));
 449         if (justkey <= 0x7f) {
 450                 if (key & KEYC_META)
 451                         input_key_write(__func__, bev, "\033", 1);
 452                 ud.data[0] = justkey;
 453                 input_key_write(__func__, bev, &ud.data[0], 1);
 454                 return (0);
 455         }
 456         if (KEYC_IS_UNICODE(justkey)) {
 457                 if (key & KEYC_META)
 458                         input_key_write(__func__, bev, "\033", 1);
 459                 utf8_to_data(justkey, &ud);
 460                 input_key_write(__func__, bev, ud.data, ud.size);
 461                 return (0);
 462         }
 463
 464         /*
 465          * Look up in the tree. If not in application keypad or cursor mode,
 466          * remove the flags from the key.
 467          */
 468         if (~s->mode & MODE_KKEYPAD)
 469                 key &= ~KEYC_KEYPAD;
 470         if (~s->mode & MODE_KCURSOR)
 471                 key &= ~KEYC_CURSOR;
 472         ike = input_key_get(key);
 473         if (ike == NULL && (key & KEYC_META) && (~key & KEYC_IMPLIED_META))
 474                 ike = input_key_get(key & ~KEYC_META);
 475         if (ike == NULL && (key & KEYC_CURSOR))
 476                 ike = input_key_get(key & ~KEYC_CURSOR);
 477         if (ike == NULL && (key & KEYC_KEYPAD))
 478                 ike = input_key_get(key & ~KEYC_KEYPAD);
 479         if (ike != NULL) {
 480                 log_debug("found key 0x%llx: \"%s\"", key, ike->data);
 481                 if ((key & KEYC_META) && (~key & KEYC_IMPLIED_META))
 482                         input_key_write(__func__, bev, "\033", 1);
 483                 input_key_write(__func__, bev, ike->data, strlen(ike->data));
 484                 return (0);
 485         }
 486
 487         /* No builtin key sequence; construct an extended key sequence. */
 488         if (~s->mode & MODE_KEXTENDED) {
 489                 if ((key & KEYC_MASK_MODIFIERS) != KEYC_CTRL)
 490                         goto missing;
 491                 justkey = (key & KEYC_MASK_KEY);
 492                 switch (justkey) {
 493                 case ' ':
 494                 case '2':
 495                         key = 0|(key & ~KEYC_MASK_KEY);
 496                         break;
 497                 case '|':
 498                         key = 28|(key & ~KEYC_MASK_KEY);
 499                         break;
 500                 case '6':
 501                         key = 30|(key & ~KEYC_MASK_KEY);
 502                         break;
 503                 case '-':
 504                 case '/':
 505                         key = 31|(key & ~KEYC_MASK_KEY);
 506                         break;
 507                 case '?':
 508                         key = 127|(key & ~KEYC_MASK_KEY);
 509                         break;
 510                 default:
 511                         if (justkey >= 'A' && justkey <= '_')
 512                                 key = (justkey - 'A')|(key & ~KEYC_MASK_KEY);
 513                         else if (justkey >= 'a' && justkey <= '~')
 514                                 key = (justkey - 96)|(key & ~KEYC_MASK_KEY);
 515                         else
 516                                 return (0);
 517                         break;
 518                 }
 519                 return (input_key(s, bev, key & ~KEYC_CTRL));
 520         }
 521         outkey = (key & KEYC_MASK_KEY);
 522         switch (key & KEYC_MASK_MODIFIERS) {
 523         case KEYC_SHIFT:
 524                 modifier = '2';
 525                 break;
 526         case KEYC_META:
 527                 modifier = '3';
 528                 break;
 529         case KEYC_SHIFT|KEYC_META:
 530                 modifier = '4';
 531                 break;
 532         case KEYC_CTRL:
 533                 modifier = '5';
 534                 break;
 535         case KEYC_SHIFT|KEYC_CTRL:
 536                 modifier = '6';
 537                 break;
 538         case KEYC_META|KEYC_CTRL:
 539                 modifier = '7';
 540                 break;
 541         case KEYC_SHIFT|KEYC_META|KEYC_CTRL:
 542                 modifier = '8';
 543                 break;
 544         default:
 545                 goto missing;
 546         }
 547         xsnprintf(tmp, sizeof tmp, "\033[%llu;%cu", outkey, modifier);
 548         input_key_write(__func__, bev, tmp, strlen(tmp));
 549         return (0);
 550
 551 missing:
 552         log_debug("key 0x%llx missing", key);
 553         return (-1);
 554 }
 555
 556 /* Get mouse event string. */
 557 int
 558 input_key_get_mouse(struct screen *s, struct mouse_event *m, u_int x, u_int y,
 559     const char **rbuf, size_t *rlen)
 560 {
 561         static char      buf[40];
 562         size_t           len;
 563
 564         *rbuf = NULL;
 565         *rlen = 0;
 566
 567         /* If this pane is not in button or all mode, discard motion events. */
 568         if (MOUSE_DRAG(m->b) && (s->mode & MOTION_MOUSE_MODES) == 0)
 569                 return (0);
 570         if ((s->mode & ALL_MOUSE_MODES) == 0)
 571                 return (0);
 572
 573         /*
 574          * If this event is a release event and not in all mode, discard it.
 575          * In SGR mode we can tell absolutely because a release is normally
 576          * shown by the last character. Without SGR, we check if the last
 577          * buttons was also a release.
 578          */
 579         if (m->sgr_type != ' ') {
 580                 if (MOUSE_DRAG(m->sgr_b) &&
 581                     MOUSE_BUTTONS(m->sgr_b) == 3 &&
 582                     (~s->mode & MODE_MOUSE_ALL))
 583                         return (0);
 584         } else {
 585                 if (MOUSE_DRAG(m->b) &&
 586                     MOUSE_BUTTONS(m->b) == 3 &&
 587                     MOUSE_BUTTONS(m->lb) == 3 &&
 588                     (~s->mode & MODE_MOUSE_ALL))
 589                         return (0);
 590         }
 591
 592         /*
 593          * Use the SGR (1006) extension only if the application requested it
 594          * and the underlying terminal also sent the event in this format (this
 595          * is because an old style mouse release event cannot be converted into
 596          * the new SGR format, since the released button is unknown). Otherwise
 597          * pretend that tmux doesn't speak this extension, and fall back to the
 598          * UTF-8 (1005) extension if the application requested, or to the
 599          * legacy format.
 600          */
 601         if (m->sgr_type != ' ' && (s->mode & MODE_MOUSE_SGR)) {
 602                 len = xsnprintf(buf, sizeof buf, "\033[<%u;%u;%u%c",
 603                     m->sgr_b, x + 1, y + 1, m->sgr_type);
 604         } else if (s->mode & MODE_MOUSE_UTF8) {
 605                 if (m->b > 0x7ff - 32 || x > 0x7ff - 33 || y > 0x7ff - 33)
 606                         return (0);
 607                 len = xsnprintf(buf, sizeof buf, "\033[M");
 608                 len += input_key_split2(m->b + 32, &buf[len]);
 609                 len += input_key_split2(x + 33, &buf[len]);
 610                 len += input_key_split2(y + 33, &buf[len]);
 611         } else {
 612                 if (m->b > 223)
 613                         return (0);
 614                 len = xsnprintf(buf, sizeof buf, "\033[M");
 615                 buf[len++] = m->b + 32;
 616                 buf[len++] = x + 33;
 617                 buf[len++] = y + 33;
 618         }
 619
 620         *rbuf = buf;
 621         *rlen = len;
 622         return (1);
 623 }
 624
 625 /* Translate mouse and output. */
 626 static void
 627 input_key_mouse(struct window_pane *wp, struct mouse_event *m)
 628 {
 629         struct screen   *s = wp->screen;
 630         u_int            x, y;
 631         const char      *buf;
 632         size_t           len;
 633
 634         /* Ignore events if no mouse mode or the pane is not visible. */
 635         if (m->ignore || (s->mode & ALL_MOUSE_MODES) == 0)
 636                 return;
 637         if (cmd_mouse_at(wp, m, &x, &y, 0) != 0)
 638                 return;
 639         if (!window_pane_visible(wp))
 640                 return;
 641         if (!input_key_get_mouse(s, m, x, y, &buf, &len))
 642                 return;
 643         log_debug("writing mouse %.*s to %%%u", (int)len, buf, wp->id);
 644         input_key_write(__func__, wp->event, buf, len);
 645 }