mines_2017.c

   1 /*******************************************************************************
   2  minesviiper 0.3.1459
   3  By Tobias Girstmair, 2015 - 2018
   4
   5  ./minesviiper 16x16x40
   6  (see ./minesviiper -h for full list of options)
   7
   8  MOUSE MODE: - left click to open and choord
   9              - right click to flag/unflag
  10  VI MODE:    - hjkl to move cursor left/down/up/right
  11              - bduw to jump left/down/up/right by 5 cells
  12              - o to open and choord
  13              - i to flag/unflag
  14
  15  GNU GPL v3, see LICENSE or https://www.gnu.org/licenses/gpl-3.0.txt
  16 *******************************************************************************/
  17
  18
  19 #define _POSIX_C_SOURCE 2 /*for getopt, sigaction in c99*/
  20 #include <ctype.h>
  21 #include <signal.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/ioctl.h>
  25 #include <sys/time.h>
  26 #include <termios.h>
  27 #include <time.h>
  28 #include <unistd.h>
  29
  30 #include "schemes.h"
  31
  32 #define LINE_OFFSET 3
  33 #define COL_OFFSET 2
  34 #define BIG_MOVE 5
  35
  36 #define MIN(a,b) (a>b?b:a)
  37 #define MAX(a,b) (a>b?a:b)
  38 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
  39 #define printm(num, str) for (int i = 0; i < num; i++) fputs (str, stdout)
  40 #define print(str) fputs (str, stdout)
  41 #define EMOT(e) op.scheme->emoticons[EMOT_ ## e]
  42
  43 struct minecell {
  44         unsigned m:2; /* mine?1:killmine?2:0 */
  45         unsigned o:1; /* open?1:0 */
  46         unsigned f:2; /* flagged?1:questioned?2:0 */
  47         unsigned n:4; /* 0<= neighbours <=8 */
  48 };
  49 struct minefield {
  50         struct minecell **c;
  51         //TODO: rename w, h to L, C
  52         int w; /* width */
  53         int h; /* height */
  54         int m; /* number of mines */
  55
  56         int f; /* flags counter */
  57         int t; /* time of game start */
  58         int p[2]; /* cursor position {line, col} */
  59         int s; /* space mode */
  60 } f;
  61
  62 struct opt {
  63         struct minescheme* scheme;
  64         int mode; /* allow flags? quesm? */
  65 } op;
  66
  67 int alt_screen = 0;
  68 char* spaces = /* for formatstring in show_minefield(); mouse-max < this */
  69         "                                                                "
  70         "                                                                "
  71         "                                                                "
  72         "                                                                ";
  73
  74 struct line_col {
  75         int l;
  76         int c;
  77 };
  78
  79 void fill_minefield (int, int);
  80 void move (int, int);
  81 void cursor_move (int, int);
  82 void to_next_boundary (int l, int c, char direction);
  83 int getch (unsigned char*);
  84 int getctrlseq (unsigned char*);
  85 int everything_opened ();
  86 int wait_mouse_up (int, int);
  87 void partial_show_minefield (int, int, int);
  88 void show_minefield (int);
  89 int get_neighbours (int, int, int);
  90 int uncover_square (int, int);
  91 void flag_square (int, int);
  92 void quesm_square (int, int);
  93 int choord_square (int, int);
  94 int do_uncover (int*);
  95 struct minecell** alloc_array (int, int);
  96 void free_field ();
  97 int screen2field_l (int);
  98 int screen2field_c (int);
  99 int field2screen_l (int);
 100 int field2screen_c (int);
 101 void quit();
 102 void signal_handler (int signum);
 103 void timer_setup (int);
 104
 105 enum modes {
 106         NORMAL,
 107         REDUCED,
 108         SHOWMINES,
 109         HIGHLIGHT,
 110 };
 111 enum flagtypes {
 112         NOFLAG,
 113         FLAG,
 114         QUESM,
 115 };
 116 enum fieldopenstates {
 117         CLOSED,
 118         OPENED,
 119 };
 120 enum game_states {
 121         GAME_INPROGRESS,
 122         GAME_NEW,
 123         GAME_WON,
 124         GAME_LOST,
 125 };
 126 enum space_modes {
 127         MODE_OPEN,
 128         MODE_FLAG,
 129         MODE_QUESM,
 130 };
 131 enum event {
 132         /* for getctrlseq() */
 133         CTRSEQ_NULL    =  0,
 134         CTRSEQ_EOF     = -1,
 135         CTRSEQ_INVALID = -2,
 136         CTRSEQ_MOUSE   = -3,
 137         /* for getch() */
 138         CTRSEQ_MOUSE_LEFT   = -4,
 139         CTRSEQ_MOUSE_MIDDLE = -5,
 140         CTRSEQ_MOUSE_RIGHT  = -6,
 141 };
 142 enum mine_types {
 143         NO_MINE,
 144         STD_MINE,
 145         DEATH_MINE,
 146 };
 147
 148 void signal_handler (int signum) {
 149         int dtime;
 150         switch (signum) {
 151         case SIGALRM:
 152                 dtime = difftime (time(NULL), f.t);
 153                 move (1, f.w*op.scheme->cell_width-(op.scheme->cell_width%2)-3-(dtime>999));
 154                 printf ("[%03d]", f.t?dtime:0);
 155                 break;
 156         case SIGINT:
 157                 exit(128+SIGINT);
 158         }
 159 }
 160
 161 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 162 struct termios saved_term_mode;
 163 struct termios set_raw_term_mode() {
 164         struct termios cur_term_mode, raw_term_mode;
 165
 166         tcgetattr(STDIN_FILENO, &cur_term_mode);
 167         raw_term_mode = cur_term_mode;
 168         raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 169         raw_term_mode.c_cc[VMIN] = 1 ;
 170         raw_term_mode.c_cc[VTIME] = 0;
 171         tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 172
 173         return cur_term_mode;
 174 }
 175 void restore_term_mode(struct termios saved_term_mode) {
 176         tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 177 }
 178
 179
 180 int main (int argc, char** argv) {
 181         struct sigaction saction;
 182         saved_term_mode = set_raw_term_mode();
 183
 184         atexit (*quit);
 185
 186         saction.sa_handler = signal_handler;
 187         sigemptyset(&saction.sa_mask);
 188         saction.sa_flags   = 0;
 189         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 190                 perror("SIGALRM");
 191                 exit(1);
 192         }
 193
 194         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 195                 perror ("SIGINT");
 196                 exit (1);
 197         }
 198         /* end screen setup */
 199
 200         op.scheme = &symbols_mono;
 201         op.mode = FLAG;
 202         /* end defaults */
 203         /* parse options */
 204         int optget;
 205         opterr = 0; /* don't print message on unrecognized option */
 206         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
 207                 switch (optget) {
 208                 case 'n': op.mode    = NOFLAG; break;
 209                 case 'f': op.mode    = FLAG; break; /*default*/
 210                 case 'q': op.mode    = QUESM; break;
 211                 case 'c': op.scheme  = &symbols_col1; break;
 212                 case 'd': op.scheme  = &symbols_doublewidth; break;
 213                 case 'h':
 214                 default:
 215                         fprintf (stderr, "%s [OPTIONS] [FIELDSPEC]\n"
 216                         "OPTIONS:\n"
 217                         "    -n(o flagging)\n"
 218                         "    -f(lagging)\n"
 219                         "    -q(uestion marks)\n"
 220                         "    -c(olored symbols)\n"
 221                         "    -d(ec charset symbols)\n"
 222                         "FIELDSPEC:\n"
 223                         "    WxH[xM] (width 'x' height 'x' mines)\n"
 224                         "    defaults to 30x16x99; mines will be ~20%% if not given\n"
 225                         "\n"
 226                         "Keybindings:\n"
 227                         "    hjkl: move left/down/up/right\n"
 228                         "    bduw: move to next boundary\n"
 229                         "    ^Gg$: move to the left/bottom/top/right\n"
 230                         "    o:    open/choord\n"
 231                         "    i:    flag/unflag\n"
 232                         "    space:modeful cursor (either open or flag)\n"
 233                         "    a:    toggle mode for space (open/flag)\n"
 234                         "    mX:   set a mark for letter X\n"
 235                         "    `X:   move to mark X (aliased to ')\n"
 236                         "    r:    start a new game\n"
 237                         "    q:    quit\n", argv[0]);
 238                         _exit(0);
 239                 }
 240         }
 241         /* end parse options*/
 242         if (optind < argc) { /* parse Fieldspec */
 243                 int n = sscanf (argv[optind], "%dx%dx%d", &f.w, &f.h, &f.m);
 244                 struct winsize w;
 245                 ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 246 #define CW op.scheme->cell_width
 247 #define WW w.ws_col /*window width  */
 248 #define WH w.ws_row /*window height */
 249 #define FW f.w      /* field width  */
 250 #define FH f.h      /* field height */
 251 #define MM 231      /* mouse maximum*/
 252 #define LB 2        /*  left border */
 253 #define RB 2        /* right border */
 254 #define TB 3        /*   top border */
 255 #define BB 2        /*bottom border */
 256
 257                 if (LB + FW*CW + RB > WW) FW = WW/CW - (LB+RB);
 258                 if (TB + FH    + BB > WH) FH = WH    - (TB+BB);
 259                 if (LB + FW*CW      > MM) FW = MM/CW - LB;
 260                 if (TB + FH         > MM) FH = MM    - TB;
 261
 262                 if (n == 1) {
 263                         fprintf (stderr, "Provide at least width and height to the Fieldspec.\r\n");
 264                         return 0;
 265                 } else if (n == 2) {
 266                         if (f.w < 30) f.m = f.w*f.h*.15625;
 267                         else f.m = f.w*f.h*.20625;
 268                         //hc: .35416_
 269                 }
 270 #undef CW
 271 #undef WW
 272 #undef WH
 273 #undef FW
 274 #undef FH
 275 #undef MM
 276 #undef LB
 277 #undef RB
 278 #undef TB
 279 #undef BB
 280         } else { /* use defaults */
 281                 f.w = 30;
 282                 f.h = 16;
 283                 f.m = 99;
 284         }
 285         /* check boundaries */
 286         if (f.m > (f.w-1) * (f.h-1)) {
 287                 f.m = (f.w-1) * (f.h-1);
 288                 fprintf (stderr, "too many mines. reduced to %d.\r\n", f.m);
 289         }
 290         /* end check */
 291
 292 newgame:
 293         f.c = alloc_array (f.h, f.w);
 294
 295         f.f = 0;
 296         f.t = 0;
 297         f.p[0] = 0;
 298         f.p[1] = 0;
 299
 300         int is_newgame = 1;
 301         int cheatmode = 0;
 302         f.s = MODE_OPEN;
 303         struct line_col markers[26];
 304         for (int i=26; i; markers[--i].l = -1);
 305
 306         /* switch to alternate screen */
 307         printf ("\033[?47h");
 308         alt_screen = 1;
 309         /* reset cursor, clear screen */
 310         printf ("\033[H\033[J");
 311
 312         /* swich charset, if necessary */
 313         if (op.scheme->init_seq != NULL) print (op.scheme->init_seq);
 314
 315         show_minefield (NORMAL);
 316
 317         /* enable mouse, hide cursor */
 318         printf ("\033[?1000h\033[?25l");
 319
 320         while (1) {
 321                 int l, c;
 322                 int action;
 323                 unsigned char mouse[3];
 324
 325                 action = getch(mouse);
 326                 switch (action) {
 327                 case ' ':
 328                         if (f.s == MODE_OPEN ||
 329                             f.c[f.p[0]][f.p[1]].o == OPENED) {
 330                                 switch (do_uncover(&is_newgame)) {
 331                                         case GAME_LOST: goto lose;
 332                                         case GAME_WON:  goto win;
 333                                 }
 334                         } else if (f.s == MODE_FLAG) {
 335                                 flag_square (f.p[0], f.p[1]);
 336                         } else if (f.s ==  MODE_QUESM) {
 337                                 quesm_square (f.p[0], f.p[1]);
 338                         }
 339                         break;
 340                 case 'a':
 341                         f.s = (f.s+1)%(op.mode+1);
 342                         show_minefield (cheatmode?SHOWMINES:NORMAL);
 343                         break;
 344                 case CTRSEQ_MOUSE_LEFT:
 345                         f.p[0] = screen2field_l (mouse[2]);
 346                         f.p[1] = screen2field_c (mouse[1]);
 347                         /* :D clicked: TODO: won't work in single-width mode! */
 348                         if (mouse[2] == LINE_OFFSET-1 &&
 349                            (mouse[1] == f.w+COL_OFFSET ||
 350                             mouse[1] == f.w+COL_OFFSET+1)) {
 351                                 free_field ();
 352                                 goto newgame;
 353                         }
 354                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 355                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 356                         /* fallthrough */
 357                 case 'o':
 358                         switch (do_uncover(&is_newgame)) {
 359                                 case GAME_LOST: goto lose;
 360                                 case GAME_WON:  goto win;
 361                         }
 362                         break;
 363                 case CTRSEQ_MOUSE_RIGHT:
 364                         f.p[0] = screen2field_l (mouse[2]);
 365                         f.p[1] = screen2field_c (mouse[1]);
 366                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 367                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 368                         /* fallthrough */
 369                 case 'i': flag_square (f.p[0], f.p[1]); break;
 370                 case '?':quesm_square (f.p[0], f.p[1]); break;
 371                 case 'h': cursor_move (f.p[0],    f.p[1]-1 ); break;
 372                 case 'j': cursor_move (f.p[0]+1,  f.p[1]   ); break;
 373                 case 'k': cursor_move (f.p[0]-1,  f.p[1]   ); break;
 374                 case 'l': cursor_move (f.p[0],    f.p[1]+1 ); break;
 375                 case 'w': to_next_boundary (f.p[0], f.p[1], '>'); break;
 376                 case 'b': to_next_boundary (f.p[0], f.p[1], '<'); break;
 377                 case 'u': to_next_boundary (f.p[0], f.p[1], '^'); break;
 378                 case 'd': to_next_boundary (f.p[0], f.p[1], 'v'); break;
 379                 case '0': /* fallthrough */
 380                 case '^': cursor_move (f.p[0],    0        ); break;
 381                 case '$': cursor_move (f.p[0],    f.w-1    ); break;
 382                 case 'g': cursor_move (0,         f.p[1]   ); break;
 383                 case 'G': cursor_move (f.h-1,     f.p[1]   ); break;
 384                 case 'm':
 385                         action = tolower(getch(mouse));
 386                         if (action < 'a' || action > 'z') break;/*out of bound*/
 387                         markers[action-'a'].l = f.p[0];
 388                         markers[action-'a'].c = f.p[1];
 389                         break;
 390                 case'\'': /* fallthrough */
 391                 case '`':
 392                         action = tolower(getch(mouse));
 393                         if (action < 'a' || action > 'z' /* out of bound or */
 394                             || markers[action-'a'].l == -1) break; /* unset */
 395                         cursor_move (markers[action-'a'].l, markers[action-'a'].c);
 396                         break;
 397                 case 'r': /* start a new game */
 398                         free_field ();
 399                         goto newgame;
 400                 case 'q':
 401                         goto quit;
 402                 case '\014': /* Ctrl-L -- redraw */
 403                         show_minefield (NORMAL);
 404                         break;
 405                 case '\\':
 406                         if (is_newgame) {
 407                                 is_newgame = 0;
 408                                 fill_minefield (-1, -1);
 409                                 timer_setup(1);
 410                         }
 411                         show_minefield (cheatmode?NORMAL:SHOWMINES);
 412                         cheatmode = !cheatmode;
 413                         break;
 414                 }
 415         }
 416
 417 win:
 418 lose:
 419         timer_setup(0); /* stop timer */
 420         show_minefield (SHOWMINES);
 421         int gotaction;
 422         do {
 423                 unsigned char mouse[3];
 424                 gotaction = getch(mouse);
 425                 /* :D clicked: TODO: won't work in single-width mode! */
 426                 if (gotaction==CTRSEQ_MOUSE_LEFT && mouse[2]==LINE_OFFSET-1 &&
 427                    (mouse[1]==f.w+COL_OFFSET || mouse[1]==f.w+COL_OFFSET+1)) {
 428                         free_field ();
 429                         goto newgame;
 430                 } else if (gotaction == 'r') {
 431                         free_field ();
 432                         goto newgame;
 433                 } else if (gotaction == 'q') {
 434                         goto quit;
 435                 }
 436         } while (1);
 437
 438 quit:
 439         return 0;
 440 }
 441
 442 void quit () {
 443         move(0,0); //move(f.h+LINE_OFFSET+2, 0);
 444         /* disable mouse, show cursor */
 445         printf ("\033[?9l\033[?25h");
 446         /* reset charset, if necessary */
 447         if (op.scheme && op.scheme->reset_seq) print (op.scheme->reset_seq);
 448         /* revert to primary screen */
 449         if (alt_screen) printf ("\033[?47l");
 450         free_field ();
 451         restore_term_mode(saved_term_mode);
 452 }
 453
 454 /* I haven't won as long as a cell exists, that
 455     - I haven't opened, and
 456     - is not a mine */
 457 int everything_opened () {
 458         for (int row = 0; row < f.h; row++)
 459                 for (int col = 0; col < f.w; col++)
 460                         if (f.c[row][col].o == CLOSED &&
 461                                 f.c[row][col].m == NO_MINE  ) return 0;
 462         return 1;
 463 }
 464
 465 int wait_mouse_up (int l, int c) {
 466         unsigned char mouse2[3];
 467         int level = 1;
 468         int l2, c2;
 469
 470         /* show :o face */
 471         move (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 472
 473         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 474                 /* show a pushed-in button if cursor is on minefield */
 475                 move (l+LINE_OFFSET, field2screen_c(c));
 476                 fputs (op.scheme->mouse_highlight, stdout);
 477         }
 478
 479         while (level > 0) {
 480                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 481                         /* ignore mouse wheel events: */
 482                         if (mouse2[0] & 0x40) continue;
 483
 484                         else if (mouse2[0]&3 == 3) level--; /* release event */
 485                         else level++; /* another button pressed */
 486                 }
 487         }
 488
 489         move (1, field2screen_c (f.w/2)-1); print (EMOT(SMILE)); //TODO: does not respect mode (SHOWMINES, GAME_WON, GAME_LOST)
 490         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 491                 partial_show_minefield (l, c, NORMAL);
 492         }
 493         c2 = screen2field_c(mouse2[1]);
 494         l2 = screen2field_l(mouse2[2]);
 495         return ((l2 == l) && (c2 == c));
 496 }
 497
 498 int choord_square (int line, int col) {
 499         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 500                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 501                         if (f.c[l][c].f != FLAG) {
 502                                 if (uncover_square (l, c))
 503                                          return 1;
 504                         }
 505                 }
 506         }
 507
 508         return 0;
 509 }
 510
 511 int uncover_square (int l, int c) {
 512         f.c[l][c].o = OPENED;
 513         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 514         partial_show_minefield (l, c, NORMAL);
 515
 516         if (f.c[l][c].m) {
 517                 f.c[l][c].m = DEATH_MINE;
 518                 return 1;
 519         }
 520
 521         /* check for chording */
 522         if (f.c[l][c].n == 0) {
 523                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 524                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 525                                 int newl = l + choord_l;
 526                                 int newc = c + choord_c;
 527                                 if (newl >= 0 && newl < f.h &&
 528                                     newc >= 0 && newc < f.w &&
 529                                     f.c[newl][newc].o == CLOSED &&
 530                                     uncover_square (newl, newc)) {
 531                                          return 1;
 532                                 }
 533                         }
 534                 }
 535         }
 536
 537         return 0;
 538 }
 539
 540 void flag_square (int l, int c) {
 541         static char modechar[] = {'*', '!', '?'};
 542
 543         if (f.c[l][c].o != CLOSED) return;
 544         /* cycles through flag/quesm/noflag (uses op.mode to detect which ones
 545         are allowed) */
 546         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 547         if (f.c[l][c].f==FLAG) f.f++;
 548         else f.f--; //WARN: breaks on `-q'!
 549         partial_show_minefield (l, c, NORMAL);
 550         move (1, op.scheme->cell_width);
 551         printf ("[%03d%c]", f.m - f.f, modechar[f.s]);
 552 }
 553
 554 void quesm_square (int l, int c) {
 555         /* toggle question mark / none. won't turn flags into question marks.
 556         unlike flag_square, this function doesn't respect `-q'. */
 557         if      (f.c[l][c].o != CLOSED) return;
 558         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 559         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 560         partial_show_minefield (l, c, NORMAL);
 561 }
 562
 563 int do_uncover (int* is_newgame) {
 564         if (*is_newgame) {
 565                 *is_newgame = 0;
 566                 fill_minefield (f.p[0], f.p[1]);
 567                 timer_setup(1);
 568         }
 569
 570         if (f.c[f.p[0]][f.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 571         if (f.c[f.p[0]][f.p[1]].o == CLOSED) {
 572                 if (uncover_square (f.p[0], f.p[1])) return GAME_LOST;
 573         } else if (get_neighbours (f.p[0], f.p[1], 1) == 0) {
 574                 if (choord_square (f.p[0], f.p[1])) return GAME_LOST;
 575         }
 576         if (everything_opened()) return GAME_WON;
 577
 578         return GAME_INPROGRESS;
 579 }
 580
 581 void fill_minefield (int l, int c) {
 582         srand (time(0));
 583         int mines_set = f.m;
 584         while (mines_set) {
 585                 int line = rand() % f.h;
 586                 int col = rand() % f.w;
 587
 588                 if (f.c[line][col].m) {
 589                 /* skip if field already has a mine */
 590                         continue;
 591                 } else if ((line == l) && (col == c)) {
 592                 /* don't put a mine on the already opened (first click) field */
 593                         continue;
 594                 } else {
 595                         mines_set--;
 596                         f.c[line][col].m = STD_MINE;
 597                 }
 598         }
 599
 600         /* precalculate neighbours */
 601         for (int l=0; l < f.h; l++)
 602                 for (int c=0; c < f.w; c++)
 603                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 604 }
 605
 606 void move (int line, int col) {
 607         printf ("\033[%d;%dH", line+1, col+1);
 608 }
 609
 610 /* absolute coordinates! */
 611 void cursor_move (int l, int c) {
 612         partial_show_minefield (f.p[0], f.p[1], NORMAL);
 613         /* update f.p */
 614         f.p[0] = CLAMP(l, 0, f.h-1);
 615         f.p[1] = CLAMP(c, 0, f.w-1);
 616         move (f.p[0]+LINE_OFFSET, field2screen_c(f.p[1]));
 617         //fputs (op.scheme->mouse_highlight, stdout);
 618
 619         if (!f.c[f.p[0]][f.p[1]].f) print("\033[7m");//invert unless ! or ?
 620         partial_show_minefield (f.p[0], f.p[1], HIGHLIGHT);
 621         print("\033[0m");//un-invert
 622 }
 623
 624 /* to_next_boundary(): move into the supplied direction until a change in open-
 625 state or flag-state is found and move there. falls back to BIG_MOVE. */
 626 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 627         new_ ## X OP ## = BIG_MOVE;\
 628         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 629                 if ((f.c[L ][C ].o<<2 + f.c[L ][C ].f) \
 630                  != (f.c[L1][C1].o<<2 + f.c[L1][C1].f)) {\
 631                         new_ ## X = i OP 1;\
 632                         break;\
 633                 }\
 634         } while(0)
 635 void to_next_boundary (int l, int c, char direction) {
 636         int new_l = l;
 637         int new_c = c;
 638         switch (direction) {
 639         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 640         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 641         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 642         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 643         }
 644
 645         cursor_move (new_l, new_c);
 646 }
 647 #undef FIND_NEXT
 648
 649 char* cell2schema (int l, int c, int mode) {
 650         struct minecell cell = f.c[l][c];
 651         /* move past invert-ctrlsequence when highlighting the cursor: */
 652         int offset = ((mode==HIGHLIGHT)*op.scheme->flag_offset);
 653
 654         if (mode == SHOWMINES) return (
 655                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged+offset:
 656                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf+offset:
 657                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 658                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 659                 cell.o == CLOSED          ? op.scheme->field_closed:
 660                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 661          else return (
 662                 cell.f == FLAG            ? op.scheme->field_flagged+offset:
 663                 cell.f == QUESM           ? op.scheme->field_question+offset:
 664                 cell.o == CLOSED          ? op.scheme->field_closed:
 665                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 666                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 667                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 668 }
 669
 670 void partial_show_minefield (int l, int c, int mode) {
 671         move (l+LINE_OFFSET, field2screen_c(c));
 672
 673         print (cell2schema(l, c, mode));
 674 }
 675
 676 void show_minefield (int mode) {
 677         int dtime;
 678         int n1, n2; /* determine size of variable width fields */
 679         int half_spaces = f.w*op.scheme->cell_width/2;
 680         static char modechar[] = {'*', '!', '?'};
 681
 682         move (0,0);
 683
 684         if (f.t == 0) {
 685                 dtime = 0;
 686         } else {
 687                 dtime = difftime (time(NULL), f.t);
 688         }
 689
 690         /* first line */
 691         print (op.scheme->border_top_l);
 692         printm (f.w, op.scheme->border_top_m);
 693         printf ("%s\r\n", op.scheme->border_top_r);
 694         /* second line */
 695         printf("%s[%03d%c]%.*s%s%.*s[%03d]%s\r\n",
 696           op.scheme->border_status_l,
 697           f.m - f.f,
 698           modechar[f.s],
 699           half_spaces-7-(f.m-f.f>999), spaces,
 700           mode==SHOWMINES?everything_opened()?EMOT(WON):EMOT(DEAD):EMOT(SMILE),
 701           half_spaces-6-(dtime>999), spaces,
 702           dtime,
 703           op.scheme->border_status_r);
 704         /* third line */
 705         print (op.scheme->border_spacer_l);
 706         printm (f.w, op.scheme->border_spacer_m);
 707         print (op.scheme->border_spacer_r);
 708         print ("\r\n");
 709         /* main body */
 710         for (int l = 0; l < f.h; l++) {
 711                 print (op.scheme->border_field_l);
 712                 for (int c = 0; c < f.w; c++) {
 713                         print (cell2schema(l, c, mode));
 714                 }
 715                 print (op.scheme->border_field_r); print ("\r\n");
 716         }
 717         /* last line */
 718         print (op.scheme->border_bottom_l);
 719         printm (f.w*op.scheme->cell_width,op.scheme->border_bottom_m);
 720         print (op.scheme->border_bottom_r);
 721         print ("\r\n");
 722 }
 723
 724 int get_neighbours (int line, int col, int reduced_mode) {
 725         /* counts mines surrounding a square
 726            modes: 0=normal; 1=reduced */
 727
 728         int count = 0;
 729
 730         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 731                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 732                         if (!l && !c) continue;
 733
 734                         count += !!f.c[l][c].m;
 735                         count -= reduced_mode * f.c[l][c].f==FLAG;
 736                 }
 737         }
 738         return count;
 739 }
 740
 741 struct minecell** alloc_array (int lines, int cols) {
 742         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 743         if (a == NULL) return NULL;
 744         for (int l = 0; l < lines; l++) {
 745                 a[l] = calloc (cols, sizeof(struct minecell));
 746                 if (a[l] == NULL) goto unalloc;
 747         }
 748
 749         return a;
 750 unalloc:
 751         for (int l = 0; l < lines; l++)
 752                 free (a[l]);
 753         return NULL;
 754 }
 755
 756 void free_field () {
 757         if (f.c == NULL) return;
 758         for (int l = 0; l < f.h; l++) {
 759                 free (f.c[l]);
 760         }
 761
 762         free (f.c);
 763         f.c = NULL;
 764 }
 765
 766 int screen2field_l (int l) {
 767         return (l-LINE_OFFSET) - 1;
 768 }
 769 /* some trickery is required to extract the mouse position from the cell width,
 770 depending on wheather we are using full width characters or double line width.
 771 WARN: tested only with scheme.cell_width = 1 and scheme.cell_width = 2. */
 772 int screen2field_c (int c) {
 773         return (c-COL_OFFSET+1 - 2*(op.scheme->cell_width%2))/2 - op.scheme->cell_width/2;
 774 }
 775 int field2screen_l (int l) {
 776         return 0; //TODO: is never used, therefore not implemented
 777 }
 778 int field2screen_c (int c) {
 779         return (op.scheme->cell_width*c+COL_OFFSET - (op.scheme->cell_width%2));
 780 }
 781
 782 enum esc_states {
 783         START,
 784         ESC_SENT,
 785         CSI_SENT,
 786         MOUSE_EVENT,
 787 };
 788 int getctrlseq (unsigned char* buf) {
 789         int c;
 790         int state = START;
 791         int offset = 0x20; /* never sends control chars as data */
 792         while ((c = getchar()) != EOF) {
 793                 switch (state) {
 794                 case START:
 795                         switch (c) {
 796                         case '\033': state=ESC_SENT; break;
 797                         default: return c;
 798                         }
 799                         break;
 800                 case ESC_SENT:
 801                         switch (c) {
 802                         case '[': state=CSI_SENT; break;
 803                         default: return CTRSEQ_INVALID;
 804                         }
 805                         break;
 806                 case CSI_SENT:
 807                         switch (c) {
 808                         case 'M': state=MOUSE_EVENT; break;
 809                         default: return CTRSEQ_INVALID;
 810                         }
 811                         break;
 812                 case MOUSE_EVENT:
 813                         buf[0] = c - offset;
 814                         buf[1] = getchar() - offset;
 815                         buf[2] = getchar() - offset;
 816                         return CTRSEQ_MOUSE;
 817                 default:
 818                         return CTRSEQ_INVALID;
 819                 }
 820         }
 821         return 2;
 822 }
 823
 824 int getch(unsigned char* buf) {
 825 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 826 compatible with the ncurses implementation of same name */
 827         int action = getctrlseq(buf);
 828         int l, c;
 829         switch (action) {
 830         case CTRSEQ_MOUSE:
 831                 l = screen2field_l (buf[2]);
 832                 c = screen2field_c (buf[1]);
 833
 834                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 835                 int success = wait_mouse_up(l, c);
 836
 837                 /* mouse moved while pressed: */
 838                 if (!success) return CTRSEQ_INVALID;
 839
 840                 switch (buf[0]) {
 841                 case 0: return CTRSEQ_MOUSE_LEFT;
 842                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 843                 case 2: return CTRSEQ_MOUSE_RIGHT;
 844                 }
 845         }
 846
 847         return action;
 848 }
 849
 850 void timer_setup (int enable) {
 851         static struct itimerval tbuf;
 852         tbuf.it_interval.tv_sec  = 1;
 853         tbuf.it_interval.tv_usec = 0;
 854
 855         if (enable) {
 856                 f.t = time(NULL);
 857                 tbuf.it_value.tv_sec  = 1;
 858                 tbuf.it_value.tv_usec = 0;
 859                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 860                         perror("setitimer");
 861                         exit(1);
 862                 }
 863         } else {
 864                 tbuf.it_value.tv_sec  = 0;
 865                 tbuf.it_value.tv_usec = 0;
 866                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 867                         perror("setitimer");
 868                         exit(1);
 869                 }
 870         }
 871
 872 }