src/key.c

   1 /* Keyboard support routines.
   2
   3    Copyright (C) 1994,1995 the Free Software Foundation.
   4
   5    Written by: 1994, 1995 Miguel de Icaza.
   6                1994, 1995 Janne Kukonlehto.
   7                1995  Jakub Jelinek.
   8                1997  Norbert Warmuth
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 #include <config.h>
  25 #include <stdio.h>
  26 #include <sys/types.h>
  27 #include <string.h>
  28 #ifdef HAVE_UNISTD_H
  29 #   include <unistd.h>
  30 #endif
  31 #include <ctype.h>
  32 #include <errno.h>
  33
  34 #include "global.h"
  35 #include "tty.h"
  36 #include "mouse.h"
  37 #include "key.h"
  38 #include "main.h"
  39 #include "win.h"
  40 #include "cons.saver.h"
  41 #include "../vfs/vfs.h"
  42
  43 #ifdef HAVE_TEXTMODE_X11_SUPPORT
  44 #include <X11/Xlib.h>
  45 #endif
  46
  47 #ifdef __linux__
  48 #    if defined(__GLIBC__) && (__GLIBC__ < 2)
  49 #        include <linux/termios.h>      /* This is needed for TIOCLINUX */
  50 #    else
  51 #        include <termios.h>
  52 #    endif
  53 #    include <sys/ioctl.h>
  54 #endif
  55
  56 #define GET_TIME(tv)    (gettimeofday(&tv, (struct timezone *)NULL))
  57 #define DIF_TIME(t1,t2) ((t2.tv_sec -t1.tv_sec) *1000+ \
  58                          (t2.tv_usec-t1.tv_usec)/1000)
  59
  60 /* timeout for old_esc_mode in usec */
  61 #define ESCMODE_TIMEOUT 1000000
  62
  63 int mou_auto_repeat = 100;
  64 int double_click_speed = 250;
  65 int old_esc_mode = 0;
  66
  67 int use_8th_bit_as_meta = 1;
  68
  69 typedef struct key_def {
  70     char ch;                    /* Holds the matching char code */
  71     int code;                   /* The code returned, valid if child == NULL */
  72     struct key_def *next;
  73     struct key_def *child;      /* sequence continuation */
  74     int action;                 /* optional action to be done. Now used only
  75                                    to mark that we are just after the first
  76                                    Escape */
  77 } key_def;
  78
  79 /* This holds all the key definitions */
  80 static key_def *keys = 0;
  81
  82 static int input_fd;
  83 static int disabled_channels = 0; /* Disable channels checking */
  84 static int xgetch_second (void);
  85
  86 /* File descriptor monitoring add/remove routines */
  87 typedef struct SelectList {
  88     int fd;
  89     select_fn callback;
  90     void *info;
  91     struct SelectList *next;
  92 } SelectList;
  93
  94 static SelectList *select_list = 0;
  95
  96 void add_select_channel (int fd, select_fn callback, void *info)
  97 {
  98     SelectList *new;
  99
 100     new = g_new (SelectList, 1);
 101     new->fd = fd;
 102     new->callback = callback;
 103     new->info = info;
 104     new->next = select_list;
 105     select_list = new;
 106 }
 107
 108 void delete_select_channel (int fd)
 109 {
 110     SelectList *p = select_list;
 111     SelectList *p_prev = 0;
 112     SelectList *p_next;
 113
 114     while (p) {
 115         if (p->fd == fd) {
 116             p_next = p->next;
 117
 118             if (p_prev)
 119                 p_prev->next = p_next;
 120             else
 121                 select_list = p_next;
 122
 123             g_free (p);
 124             p = p_next;
 125             continue;
 126         }
 127
 128         p_prev = p;
 129         p = p->next;
 130     }
 131 }
 132
 133 inline static int add_selects (fd_set *select_set)
 134 {
 135     SelectList *p;
 136     int        top_fd = 0;
 137
 138     if (disabled_channels)
 139         return 0;
 140
 141     for (p = select_list; p; p = p->next){
 142         FD_SET (p->fd, select_set);
 143         if (p->fd > top_fd)
 144             top_fd = p->fd;
 145     }
 146     return top_fd;
 147 }
 148
 149 static void check_selects (fd_set *select_set)
 150 {
 151     SelectList *p;
 152
 153     if (disabled_channels)
 154         return;
 155
 156     for (p = select_list; p; p = p->next)
 157         if (FD_ISSET (p->fd, select_set))
 158             (*p->callback)(p->fd, p->info);
 159 }
 160
 161 void channels_down (void)
 162 {
 163     disabled_channels ++;
 164 }
 165
 166 void channels_up (void)
 167 {
 168     if (!disabled_channels)
 169         fprintf (stderr,
 170                  "Error: channels_up called with disabled_channels = 0\n");
 171     disabled_channels--;
 172 }
 173
 174 typedef const struct {
 175     int code;
 176     char *seq;
 177     int action;
 178 } key_define_t;
 179
 180 static key_define_t mc_bindings [] = {
 181     { KEY_END,    ESC_STR ">", MCKEY_NOACTION },
 182     { KEY_HOME,   ESC_STR "<", MCKEY_NOACTION },
 183     { 0, 0, MCKEY_NOACTION },
 184 };
 185
 186 /* Broken terminfo and termcap databases on xterminals */
 187 static key_define_t xterm_key_defines [] = {
 188     { KEY_F(1),   ESC_STR "OP",   MCKEY_NOACTION },
 189     { KEY_F(2),   ESC_STR "OQ",   MCKEY_NOACTION },
 190     { KEY_F(3),   ESC_STR "OR",   MCKEY_NOACTION },
 191     { KEY_F(4),   ESC_STR "OS",   MCKEY_NOACTION },
 192     { KEY_F(1),   ESC_STR "[11~", MCKEY_NOACTION },
 193     { KEY_F(2),   ESC_STR "[12~", MCKEY_NOACTION },
 194     { KEY_F(3),   ESC_STR "[13~", MCKEY_NOACTION },
 195     { KEY_F(4),   ESC_STR "[14~", MCKEY_NOACTION },
 196     { KEY_F(5),   ESC_STR "[15~", MCKEY_NOACTION },
 197     { KEY_F(6),   ESC_STR "[17~", MCKEY_NOACTION },
 198     { KEY_F(7),   ESC_STR "[18~", MCKEY_NOACTION },
 199     { KEY_F(8),   ESC_STR "[19~", MCKEY_NOACTION },
 200     { KEY_F(9),   ESC_STR "[20~", MCKEY_NOACTION },
 201     { KEY_F(10),  ESC_STR "[21~", MCKEY_NOACTION },
 202     { 0, 0, MCKEY_NOACTION },
 203 };
 204
 205 static key_define_t mc_default_keys [] = {
 206     { ESC_CHAR, ESC_STR, MCKEY_ESCAPE },
 207     { ESC_CHAR, ESC_STR ESC_STR, MCKEY_NOACTION },
 208     { 0, 0, MCKEY_NOACTION },
 209 };
 210
 211 static void
 212 define_sequences (key_define_t *kd)
 213 {
 214     int i;
 215
 216     for (i = 0; kd [i].code; i++)
 217         define_sequence(kd [i].code, kd [i].seq, kd [i].action);
 218 }
 219
 220 #ifdef HAVE_TEXTMODE_X11_SUPPORT
 221 static Display *x11_display;
 222 static Window x11_window;
 223 #endif /* HAVE_TEXTMODE_X11_SUPPORT */
 224
 225 /* This has to be called before slang_init or whatever routine
 226    calls any define_sequence */
 227 void init_key (void)
 228 {
 229     char *term = (char *) getenv ("TERM");
 230
 231     /* This has to be the first define_sequence */
 232     /* So, we can assume that the first keys member has ESC */
 233     define_sequences (mc_default_keys);
 234
 235     /* Terminfo on irix does not have some keys */
 236     if ((!strncmp (term, "iris-ansi", 9)) || (!strncmp (term, "xterm", 5)))
 237         define_sequences (xterm_key_defines);
 238
 239     define_sequences (mc_bindings);
 240
 241     /* load some additional keys (e.g. direct Alt-? support) */
 242     load_xtra_key_defines();
 243
 244 #ifdef __QNX__
 245     if (strncmp(term, "qnx", 3) == 0){
 246         /* Modify the default value of use_8th_bit_as_meta: we would
 247          * like to provide a working mc for a newbie who knows nothing
 248          * about [Options|Display bits|Full 8 bits input]...
 249          *
 250          * Don't use 'meta'-bit, when we are dealing with a
 251          * 'qnx*'-type terminal: clear the default value!
 252          * These terminal types use 0xFF as an escape character,
 253          * so use_8th_bit_as_meta==1 must not be enabled!
 254          *
 255          * [mc-4.1.21+,slint.c/getch(): the DEC_8BIT_HACK stuff
 256          * is not used now (doesn't even depend on use_8th_bit_as_meta
 257          * as in mc-3.1.2)...GREAT!...no additional code is required!]
 258          */
 259         use_8th_bit_as_meta = 0;
 260     }
 261 #endif /* __QNX__ */
 262
 263 #ifdef HAVE_TEXTMODE_X11_SUPPORT
 264     x11_display = XOpenDisplay (0);
 265     if (x11_display)
 266         x11_window = DefaultRootWindow (x11_display);
 267 #endif /* HAVE_TEXTMODE_X11_SUPPORT */
 268 }
 269
 270 /* This has to be called after SLang_init_tty/slint_init */
 271 void init_key_input_fd (void)
 272 {
 273 #ifdef HAVE_SLANG
 274     input_fd = SLang_TT_Read_FD;
 275 #endif
 276 }
 277
 278
 279 static void
 280 xmouse_get_event (Gpm_Event *ev)
 281 {
 282     int btn;
 283     static struct timeval tv1 = { 0, 0 }; /* Force first click as single */
 284     static struct timeval tv2;
 285     static int clicks;
 286     static int last_btn = 0;
 287
 288     /* Decode Xterm mouse information to a GPM style event */
 289
 290     /* Variable btn has following meaning: */
 291     /* 0 = btn1 dn, 1 = btn2 dn, 2 = btn3 dn, 3 = btn up */
 292     btn = getch () - 32;
 293
 294     /* There seems to be no way of knowing which button was released */
 295     /* So we assume all the buttons were released */
 296
 297     if (btn == 3){
 298         if (last_btn) {
 299             ev->type = GPM_UP | (GPM_SINGLE << clicks);
 300             ev->buttons = 0;
 301             last_btn = 0;
 302             GET_TIME (tv1);
 303             clicks = 0;
 304         } else {
 305             /* Bogus event, maybe mouse wheel */
 306             ev->type = 0;
 307         }
 308     } else {
 309         ev->type = GPM_DOWN;
 310         GET_TIME (tv2);
 311         if (tv1.tv_sec && (DIF_TIME (tv1,tv2) < double_click_speed)){
 312             clicks++;
 313             clicks %= 3;
 314         } else
 315             clicks = 0;
 316
 317         switch (btn) {
 318         case 0:
 319             ev->buttons = GPM_B_LEFT;
 320             break;
 321         case 1:
 322             ev->buttons = GPM_B_MIDDLE;
 323             break;
 324         case 2:
 325             ev->buttons = GPM_B_RIGHT;
 326             break;
 327         default:
 328             /* Nothing */
 329             ev->type = 0;
 330             ev->buttons = 0;
 331             break;
 332         }
 333         last_btn = ev->buttons;
 334     }
 335     /* Coordinates are 33-based */
 336     /* Transform them to 1-based */
 337     ev->x = getch () - 32;
 338     ev->y = getch () - 32;
 339 }
 340
 341 static key_def *create_sequence (char *seq, int code, int action)
 342 {
 343     key_def *base, *p, *attach;
 344
 345     for (base = attach = NULL; *seq; seq++){
 346         p = g_new (key_def, 1);
 347         if (!base) base = p;
 348         if (attach) attach->child = p;
 349
 350         p->ch   = *seq;
 351         p->code = code;
 352         p->child = p->next = NULL;
 353         if (!seq[1])
 354             p->action = action;
 355         else
 356             p->action = MCKEY_NOACTION;
 357         attach = p;
 358     }
 359     return base;
 360 }
 361
 362 /* The maximum sequence length (32 + null terminator) */
 363 #define SEQ_BUFFER_LEN 33
 364 static int seq_buffer [SEQ_BUFFER_LEN];
 365 static int *seq_append = 0;
 366
 367 static int push_char (int c)
 368 {
 369     if (!seq_append)
 370         seq_append = seq_buffer;
 371
 372     if (seq_append == &(seq_buffer [SEQ_BUFFER_LEN-2]))
 373         return 0;
 374     *(seq_append++) = c;
 375     *seq_append = 0;
 376     return 1;
 377 }
 378
 379 /*
 380  * Return 1 on success, 0 on error.
 381  * An error happens if SEQ is a beginning of an existing longer sequence.
 382  */
 383 int define_sequence (int code, char *seq, int action)
 384 {
 385     key_def *base;
 386
 387     if (strlen (seq) > SEQ_BUFFER_LEN-1)
 388         return 0;
 389
 390     for (base = keys; (base != 0) && *seq; ){
 391         if (*seq == base->ch){
 392             if (base->child == 0){
 393                 if (*(seq+1)){
 394                     base->child = create_sequence (seq+1, code, action);
 395                     return 1;
 396                 } else {
 397                     /* The sequence matches an existing one.  */
 398                     base->code = code;
 399                     base->action = action;
 400                     return 1;
 401                 }
 402             } else {
 403                 base = base->child;
 404                 seq++;
 405             }
 406         } else {
 407             if (base->next)
 408                 base = base->next;
 409             else {
 410                 base->next = create_sequence (seq, code, action);
 411                 return 1;
 412             }
 413         }
 414     }
 415
 416     if (!*seq) {
 417         /* Attempt to redefine a sequence with a shorter sequence.  */
 418         return 0;
 419     }
 420
 421     keys = create_sequence (seq, code, action);
 422     return 1;
 423 }
 424
 425 static int *pending_keys;
 426
 427 static int
 428 correct_key_code (int c)
 429 {
 430     /* This is needed on some OS that do not support ncurses and */
 431     /* do some magic after read()ing the data */
 432     if (c == '\r')
 433         return '\n';
 434
 435 #ifdef IS_AIX
 436     if (c == KEY_SCANCEL)
 437         return '\t';
 438 #endif
 439
 440     if (c == KEY_F(0))
 441         return KEY_F(10);
 442
 443     if (!alternate_plus_minus)
 444         switch (c) {
 445             case KEY_KP_ADD: c = '+'; break;
 446             case KEY_KP_SUBTRACT: c = '-'; break;
 447             case KEY_KP_MULTIPLY: c = '*'; break;
 448         }
 449
 450     return c;
 451 }
 452
 453 int get_key_code (int no_delay)
 454 {
 455     int c;
 456     static key_def *this = NULL, *parent;
 457     static struct timeval esctime = { -1, -1 };
 458     static int lastnodelay = -1;
 459
 460     if (no_delay != lastnodelay) {
 461         this = NULL;
 462         lastnodelay = no_delay;
 463     }
 464
 465  pend_send:
 466     if (pending_keys){
 467         int d = *pending_keys++;
 468  check_pend:
 469         if (!*pending_keys){
 470             pending_keys = 0;
 471             seq_append = 0;
 472         }
 473         if (d == ESC_CHAR && pending_keys){
 474             d = ALT(*pending_keys++);
 475             goto check_pend;
 476         }
 477         if ((d & 0x80) && use_8th_bit_as_meta)
 478             d = ALT(d & 0x7f);
 479         this = NULL;
 480         return correct_key_code (d);
 481     }
 482
 483  nodelay_try_again:
 484     if (no_delay) {
 485         nodelay (stdscr, TRUE);
 486     }
 487     c = getch ();
 488 #if defined(USE_NCURSES) && defined(KEY_RESIZE)
 489     if (c == KEY_RESIZE)
 490         goto nodelay_try_again;
 491 #endif
 492     if (no_delay) {
 493         nodelay (stdscr, FALSE);
 494         if (c == ERR) {
 495             if (this != NULL && parent != NULL &&
 496                 parent->action == MCKEY_ESCAPE && old_esc_mode) {
 497                 struct timeval current, timeout;
 498
 499                 if (esctime.tv_sec == -1)
 500                     return ERR;
 501                 GET_TIME (current);
 502                 timeout.tv_sec = ESCMODE_TIMEOUT / 1000000 + esctime.tv_sec;
 503                 timeout.tv_usec = ESCMODE_TIMEOUT % 1000000 + esctime.tv_usec;
 504                 if (timeout.tv_usec > 1000000) {
 505                     timeout.tv_usec -= 1000000;
 506                     timeout.tv_sec++;
 507                 }
 508                 if (current.tv_sec < timeout.tv_sec)
 509                     return ERR;
 510                 if (current.tv_sec == timeout.tv_sec &&
 511                     current.tv_usec < timeout.tv_usec)
 512                     return ERR;
 513                 this = NULL;
 514                 pending_keys = seq_append = NULL;
 515                 return ESC_CHAR;
 516             }
 517             return ERR;
 518         }
 519     } else if (c == ERR){
 520         /* Maybe we got an incomplete match.
 521            This we do only in delay mode, since otherwise
 522            getch can return ERR at any time. */
 523         if (seq_append) {
 524             pending_keys = seq_buffer;
 525             goto pend_send;
 526         }
 527         this = NULL;
 528         return ERR;
 529     }
 530
 531     /* Search the key on the root */
 532     if (!no_delay || this == NULL) {
 533         this = keys;
 534         parent = NULL;
 535
 536         if ((c & 0x80) && use_8th_bit_as_meta) {
 537             c &= 0x7f;
 538
 539             /* The first sequence defined starts with esc */
 540             parent = keys;
 541             this = keys->child;
 542         }
 543     }
 544     while (this){
 545         if (c == this->ch){
 546             if (this->child){
 547                 if (!push_char (c)){
 548                     pending_keys = seq_buffer;
 549                     goto pend_send;
 550                 }
 551                 parent = this;
 552                 this = this->child;
 553                 if (parent->action == MCKEY_ESCAPE && old_esc_mode) {
 554                     if (no_delay) {
 555                         GET_TIME (esctime);
 556                         if (this == NULL) {
 557                             /* Shouldn't happen */
 558                             fprintf (stderr, "Internal error\n");
 559                             exit (1);
 560                         }
 561                         goto nodelay_try_again;
 562                     }
 563                     esctime.tv_sec = -1;
 564                     c = xgetch_second ();
 565                     if (c == ERR) {
 566                         pending_keys = seq_append = NULL;
 567                         this = NULL;
 568                         return ESC_CHAR;
 569                     }
 570                 } else {
 571                     if (no_delay)
 572                         goto nodelay_try_again;
 573                     c = getch ();
 574                 }
 575             } else {
 576                 /* We got a complete match, return and reset search */
 577                 int code;
 578
 579                 pending_keys = seq_append = NULL;
 580                 code = this->code;
 581                 this = NULL;
 582                 return correct_key_code (code);
 583             }
 584         } else {
 585             if (this->next)
 586                 this = this->next;
 587             else {
 588                 if (parent != NULL && parent->action == MCKEY_ESCAPE) {
 589                     /* This is just to save a lot of define_sequences */
 590                     if (isalpha(c)
 591                         || (c == '\n') || (c == '\t') || (c == XCTRL('h'))
 592                         || (c == KEY_BACKSPACE) || (c == '!') || (c == '\r')
 593                         || c == 127 || c == '+' || c == '-' || c == '\\'
 594                         || c == '?')
 595                         c = ALT(c);
 596                     else if (isdigit(c))
 597                         c = KEY_F (c-'0');
 598                     else if (c == ' ')
 599                         c = ESC_CHAR;
 600                     pending_keys = seq_append = NULL;
 601                     this = NULL;
 602                     return correct_key_code (c);
 603                 }
 604                 /* Did not find a match or {c} was changed in the if above,
 605                    so we have to return everything we had skipped
 606                  */
 607                 push_char (c);
 608                 pending_keys = seq_buffer;
 609                 goto pend_send;
 610             }
 611         }
 612     }
 613     this = NULL;
 614     return correct_key_code (c);
 615 }
 616
 617 /* If set timeout is set, then we wait 0.1 seconds, else, we block */
 618 static void
 619 try_channels (int set_timeout)
 620 {
 621     struct timeval timeout;
 622     static fd_set select_set;
 623     struct timeval *timeptr;
 624     int v;
 625     int maxfdp;
 626
 627     while (1){
 628         FD_ZERO (&select_set);
 629         FD_SET  (input_fd, &select_set);        /* Add stdin */
 630         maxfdp = max (add_selects (&select_set), input_fd);
 631
 632         if (set_timeout){
 633             timeout.tv_sec = 0;
 634             timeout.tv_usec = 100000;
 635             timeptr = &timeout;
 636         } else
 637             timeptr = 0;
 638
 639         v = select (maxfdp + 1, &select_set, NULL, NULL, timeptr);
 640         if (v > 0){
 641             check_selects (&select_set);
 642             if (FD_ISSET (input_fd, &select_set))
 643                 return;
 644         }
 645     }
 646 }
 647
 648 /* Workaround for System V Curses vt100 bug */
 649 static int getch_with_delay (void)
 650 {
 651     int c;
 652
 653     /* This routine could be used on systems without mouse support,
 654        so we need to do the select check :-( */
 655     while (1){
 656         if (!pending_keys)
 657             try_channels (0);
 658
 659         /* Try to get a character */
 660         c = get_key_code (0);
 661         if (c != ERR)
 662             break;
 663         /* Failed -> wait 0.1 secs and try again */
 664         try_channels (1);
 665     }
 666     /* Success -> return the character */
 667     return c;
 668 }
 669
 670 extern int max_dirt_limit;
 671
 672 /* Returns a character read from stdin with appropriate interpretation */
 673 /* Also takes care of generated mouse events */
 674 /* Returns EV_MOUSE if it is a mouse event */
 675 /* Returns EV_NONE  if non-blocking or interrupt set and nothing was done */
 676 int
 677 get_event (Gpm_Event * event, int redo_event, int block)
 678 {
 679     int c;
 680     static int flag;            /* Return value from select */
 681 #ifdef HAVE_LIBGPM
 682     static Gpm_Event ev;        /* Mouse event */
 683 #endif
 684     struct timeval timeout;
 685     struct timeval *time_addr = NULL;
 686     static int dirty = 3;
 687
 688     if ((dirty == 3) || is_idle ()) {
 689         mc_refresh ();
 690         doupdate ();
 691         dirty = 1;
 692     } else
 693         dirty++;
 694
 695     vfs_timeout_handler ();
 696
 697     /* Ok, we use (event->x < 0) to signal that the event does not contain
 698        a suitable position for the mouse, so we can't use show_mouse_pointer
 699        on it.
 700      */
 701     if (event->x > 0) {
 702         show_mouse_pointer (event->x, event->y);
 703         if (!redo_event)
 704             event->x = -1;
 705     }
 706
 707     /* Repeat if using mouse */
 708     while (mouse_enabled && !pending_keys) {
 709         int maxfdp;
 710         fd_set select_set;
 711
 712         FD_ZERO (&select_set);
 713         FD_SET (input_fd, &select_set);
 714         maxfdp = max (add_selects (&select_set), input_fd);
 715
 716 #ifdef HAVE_LIBGPM
 717         if (use_mouse_p == MOUSE_GPM) {
 718             if (gpm_fd == -1) {
 719                 /* Connection to gpm broken, possibly gpm has died */
 720                 mouse_enabled = 0;
 721                 use_mouse_p = MOUSE_NONE;
 722                 break;
 723             }
 724             FD_SET (gpm_fd, &select_set);
 725             maxfdp = max (maxfdp, gpm_fd);
 726         }
 727 #endif
 728
 729         if (redo_event) {
 730             timeout.tv_usec = mou_auto_repeat * 1000;
 731             timeout.tv_sec = 0;
 732
 733             time_addr = &timeout;
 734         } else {
 735             int seconds;
 736
 737             if ((seconds = vfs_timeouts ())) {
 738                 /* the timeout could be improved and actually be
 739                  * the number of seconds until the next vfs entry
 740                  * timeouts in the stamp list.
 741                  */
 742
 743                 timeout.tv_sec = seconds;
 744                 timeout.tv_usec = 0;
 745                 time_addr = &timeout;
 746             } else
 747                 time_addr = NULL;
 748         }
 749
 750         if (!block) {
 751             time_addr = &timeout;
 752             timeout.tv_sec = 0;
 753             timeout.tv_usec = 0;
 754         }
 755         enable_interrupt_key ();
 756         flag = select (maxfdp + 1, &select_set, NULL, NULL, time_addr);
 757         disable_interrupt_key ();
 758
 759         /* select timed out: it could be for any of the following reasons:
 760          * redo_event -> it was because of the MOU_REPEAT handler
 761          * !block     -> we did not block in the select call
 762          * else       -> 10 second timeout to check the vfs status.
 763          */
 764         if (flag == 0) {
 765             if (redo_event)
 766                 return EV_MOUSE;
 767             if (!block)
 768                 return EV_NONE;
 769             vfs_timeout_handler ();
 770         }
 771         if (flag == -1 && errno == EINTR)
 772             return EV_NONE;
 773
 774         check_selects (&select_set);
 775
 776         if (FD_ISSET (input_fd, &select_set))
 777             break;
 778 #ifdef HAVE_LIBGPM
 779         if (use_mouse_p == MOUSE_GPM && FD_ISSET (gpm_fd, &select_set)) {
 780             Gpm_GetEvent (&ev);
 781             Gpm_FitEvent (&ev);
 782             *event = ev;
 783             return EV_MOUSE;
 784         }
 785 #endif                          /* !HAVE_LIBGPM */
 786     }
 787 #ifndef HAVE_SLANG
 788     flag = is_wintouched (stdscr);
 789     untouchwin (stdscr);
 790 #endif                          /* !HAVE_SLANG */
 791     c = block ? getch_with_delay () : get_key_code (1);
 792
 793 #ifndef HAVE_SLANG
 794     if (flag)
 795         touchwin (stdscr);
 796 #endif                          /* !HAVE_SLANG */
 797
 798     if (c == MCKEY_MOUSE
 799 #ifdef KEY_MOUSE
 800         || c == KEY_MOUSE
 801 #endif                          /* KEY_MOUSE */
 802         ) {
 803         /* Mouse event */
 804         xmouse_get_event (event);
 805         if (event->type)
 806             return EV_MOUSE;
 807         else
 808             return EV_NONE;
 809     }
 810
 811     return c;
 812 }
 813
 814 /* Returns a key press, mouse events are discarded */
 815 int mi_getch ()
 816 {
 817     Gpm_Event ev;
 818     int       key;
 819
 820     ev.x = -1;
 821     while ((key = get_event (&ev, 0, 1)) == EV_NONE)
 822         ;
 823     return key;
 824 }
 825
 826 static int xgetch_second (void)
 827 {
 828     fd_set Read_FD_Set;
 829     int c;
 830     struct timeval timeout;
 831
 832     timeout.tv_sec = ESCMODE_TIMEOUT / 1000000;
 833     timeout.tv_usec = ESCMODE_TIMEOUT % 1000000;
 834     nodelay (stdscr, TRUE);
 835     FD_ZERO (&Read_FD_Set);
 836     FD_SET (input_fd, &Read_FD_Set);
 837     select (input_fd + 1, &Read_FD_Set, NULL, NULL, &timeout);
 838     c = getch ();
 839     nodelay (stdscr, FALSE);
 840     return c;
 841 }
 842
 843 static void
 844 learn_store_key (char *buffer, char **p, int c)
 845 {
 846     if (*p - buffer > 253)
 847         return;
 848     if (c == ESC_CHAR) {
 849         *(*p)++ = '\\';
 850         *(*p)++ = 'e';
 851     } else if (c < ' ') {
 852         *(*p)++ = '^';
 853         *(*p)++ = c + 'a' - 1;
 854     } else if (c == '^') {
 855         *(*p)++ = '^';
 856         *(*p)++ = '^';
 857     } else
 858         *(*p)++ = (char) c;
 859 }
 860
 861 char *learn_key (void)
 862 {
 863 /* LEARN_TIMEOUT in usec */
 864 #define LEARN_TIMEOUT 200000
 865
 866     fd_set Read_FD_Set;
 867     struct timeval endtime;
 868     struct timeval timeout;
 869     int c;
 870     char buffer [256];
 871     char *p = buffer;
 872
 873     keypad(stdscr, FALSE); /* disable intepreting keys by ncurses */
 874     c = getch ();
 875     while (c == ERR)
 876         c = getch (); /* Sanity check, should be unnecessary */
 877     learn_store_key (buffer, &p, c);
 878     GET_TIME (endtime);
 879     endtime.tv_usec += LEARN_TIMEOUT;
 880     if (endtime.tv_usec > 1000000) {
 881         endtime.tv_usec -= 1000000;
 882         endtime.tv_sec++;
 883     }
 884     nodelay (stdscr, TRUE);
 885     for (;;) {
 886         while ((c = getch ()) == ERR) {
 887             GET_TIME (timeout);
 888             timeout.tv_usec = endtime.tv_usec - timeout.tv_usec;
 889             if (timeout.tv_usec < 0)
 890                 timeout.tv_sec++;
 891             timeout.tv_sec = endtime.tv_sec - timeout.tv_sec;
 892             if (timeout.tv_sec >= 0 && timeout.tv_usec > 0) {
 893                 FD_ZERO (&Read_FD_Set);
 894                 FD_SET (input_fd, &Read_FD_Set);
 895                 select (input_fd + 1, &Read_FD_Set, NULL, NULL, &timeout);
 896             } else
 897                 break;
 898         }
 899         if (c == ERR)
 900             break;
 901         learn_store_key (buffer, &p, c);
 902     }
 903     keypad(stdscr, TRUE);
 904     nodelay (stdscr, FALSE);
 905     *p = 0;
 906     return g_strdup (buffer);
 907 }
 908
 909 /* xterm and linux console only: set keypad to numeric or application
 910    mode. Only in application keypad mode it's possible to distinguish
 911    the '+' key and the '+' on the keypad ('*' and '-' ditto)*/
 912 void
 913 numeric_keypad_mode (void)
 914 {
 915     if (console_flag || xterm_flag) {
 916         fprintf (stdout, "\033>");
 917         fflush (stdout);
 918     }
 919 }
 920
 921 void
 922 application_keypad_mode (void)
 923 {
 924     if (console_flag || xterm_flag) {
 925         fprintf (stdout, "\033=");
 926         fflush (stdout);
 927     }
 928 }
 929
 930
 931 /* A function to check if we're idle.
 932    Currently checks only for key presses.
 933    We could also check the mouse. */
 934 int is_idle (void)
 935 {
 936     /* Check for incoming key presses     *
 937      * If there are any we say we're busy */
 938
 939     fd_set select_set;
 940     struct timeval timeout;
 941     FD_ZERO (&select_set);
 942     FD_SET (0, &select_set);
 943     timeout.tv_sec = 0;
 944     timeout.tv_usec = 0;
 945     select (1, &select_set, 0, 0, &timeout);
 946     return ! FD_ISSET (0, &select_set);
 947 }
 948
 949
 950 int
 951 get_modifier (void)
 952 {
 953 #ifdef HAVE_TEXTMODE_X11_SUPPORT
 954     if (x11_display) {
 955         Window root, child;
 956         int root_x, root_y;
 957         int win_x, win_y;
 958         unsigned int mask;
 959         Bool b;
 960         int result = 0;
 961
 962         b = XQueryPointer(x11_display, x11_window, &root, &child,
 963                                   &root_x, &root_y,
 964                                   &win_x, &win_y,
 965                                   &mask);
 966
 967         if (mask & ShiftMask)
 968             result |= SHIFT_PRESSED;
 969         if (mask & ControlMask)
 970             result |= CONTROL_PRESSED;
 971         return result;
 972     } else
 973 #endif
 974 #ifdef __linux__
 975     {
 976         unsigned char modifiers;
 977
 978         modifiers = 6;
 979
 980         if (ioctl (0, TIOCLINUX, &modifiers) < 0)
 981             return 0;
 982
 983         return (int) modifiers;
 984     }
 985 #else
 986     return 0;
 987 #endif
 988 }
 989
 990 int
 991 ctrl_pressed (void)
 992 {
 993     if (get_modifier () & CONTROL_PRESSED)
 994         return 1;
 995     else
 996         return 0;
 997 }
 998
 999 static void k_dispose (key_def *k)
1000 {
1001     if (!k)
1002         return;
1003     k_dispose (k->child);
1004     k_dispose (k->next);
1005     g_free (k);
1006 }
1007
1008 static void s_dispose (SelectList *sel)
1009 {
1010     if (!sel)
1011         return;
1012
1013     s_dispose (sel->next);
1014     g_free (sel);
1015 }
1016
1017 void done_key ()
1018 {
1019     k_dispose (keys);
1020     s_dispose (select_list);
1021
1022 #ifdef HAVE_TEXTMODE_X11_SUPPORT
1023     if (x11_display)
1024         XCloseDisplay (x11_display);
1025 #endif /* HAVE_TEXTMODE_X11_SUPPORT */
1026 }