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
  69 struct line_col {
  70         int l;
  71         int c;
  72 };
  73
  74 void fill_minefield (int, int);
  75 void move (int, int);
  76 void cursor_move (int, int);
  77 void to_next_boundary (int l, int c, char direction);
  78 int getch (unsigned char*);
  79 int getctrlseq (unsigned char*);
  80 int everything_opened ();
  81 int wait_mouse_up (int, int);
  82 void partial_show_minefield (int, int, int);
  83 void show_minefield (int);
  84 int get_neighbours (int, int, int);
  85 int uncover_square (int, int);
  86 void flag_square (int, int);
  87 void quesm_square (int, int);
  88 int choord_square (int, int);
  89 int do_uncover (int*);
  90 struct minecell** alloc_array (int, int);
  91 void free_field ();
  92 int screen2field_l (int);
  93 int screen2field_c (int);
  94 int field2screen_l (int);
  95 int field2screen_c (int);
  96 void quit();
  97 void signal_handler (int signum);
  98 void timer_setup (int);
  99
 100 enum modes {
 101         NORMAL,
 102         REDUCED,
 103         SHOWMINES,
 104         HIGHLIGHT,
 105 };
 106 enum flagtypes {
 107         NOFLAG,
 108         FLAG,
 109         QUESM,
 110 };
 111 enum fieldopenstates {
 112         CLOSED,
 113         OPENED,
 114 };
 115 enum game_states {
 116         GAME_INPROGRESS,
 117         GAME_NEW,
 118         GAME_WON,
 119         GAME_LOST,
 120 };
 121 enum space_modes {
 122         MODE_OPEN,
 123         MODE_FLAG,
 124         MODE_QUESM,
 125 };
 126 enum event {
 127         /* for getctrlseq() */
 128         CTRSEQ_NULL    =  0,
 129         CTRSEQ_EOF     = -1,
 130         CTRSEQ_INVALID = -2,
 131         CTRSEQ_MOUSE   = -3,
 132         /* for getch() */
 133         CTRSEQ_MOUSE_LEFT   = -4,
 134         CTRSEQ_MOUSE_MIDDLE = -5,
 135         CTRSEQ_MOUSE_RIGHT  = -6,
 136 };
 137 enum mine_types {
 138         NO_MINE,
 139         STD_MINE,
 140         DEATH_MINE,
 141 };
 142
 143 void signal_handler (int signum) {
 144         switch (signum) {
 145         case SIGALRM:
 146                 move (1, f.w*op.scheme->cell_width-(op.scheme->cell_width%2)-3);
 147                 printf ("[%03d]", f.t?(int)difftime (time(NULL), f.t):0);
 148                 break;
 149         case SIGINT:
 150                 exit(128+SIGINT);
 151         }
 152 }
 153
 154 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 155 struct termios saved_term_mode;
 156 struct termios set_raw_term_mode() {
 157         struct termios cur_term_mode, raw_term_mode;
 158
 159         tcgetattr(STDIN_FILENO, &cur_term_mode);
 160         raw_term_mode = cur_term_mode;
 161         raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 162         raw_term_mode.c_cc[VMIN] = 1 ;
 163         raw_term_mode.c_cc[VTIME] = 0;
 164         tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 165
 166         return cur_term_mode;
 167 }
 168 void restore_term_mode(struct termios saved_term_mode) {
 169         tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 170 }
 171
 172
 173 int main (int argc, char** argv) {
 174         struct sigaction saction;
 175         saved_term_mode = set_raw_term_mode();
 176
 177         atexit (*quit);
 178
 179         saction.sa_handler = signal_handler;
 180         sigemptyset(&saction.sa_mask);
 181         saction.sa_flags   = 0;
 182         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 183                 perror("SIGALRM");
 184                 exit(1);
 185         }
 186
 187         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 188                 perror ("SIGINT");
 189                 exit (1);
 190         }
 191         /* end screen setup */
 192
 193         op.scheme = &symbols_mono;
 194         op.mode = FLAG;
 195         /* end defaults */
 196         /* parse options */
 197         int optget;
 198         opterr = 0; /* don't print message on unrecognized option */
 199         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
 200                 switch (optget) {
 201                 case 'n': op.mode    = NOFLAG; break;
 202                 case 'f': op.mode    = FLAG; break; /*default*/
 203                 case 'q': op.mode    = QUESM; break;
 204                 case 'c': op.scheme  = &symbols_col1; break;
 205                 case 'd': op.scheme  = &symbols_doublewidth; break;
 206                 case 'h':
 207                 default:
 208                         fprintf (stderr, "%s [OPTIONS] [FIELDSPEC]\n"
 209                         "OPTIONS:\n"
 210                         "    -n(o flagging)\n"
 211                         "    -f(lagging)\n"
 212                         "    -q(uestion marks)\n"
 213                         "    -c(olored symbols)\n"
 214                         "    -d(ec charset symbols)\n"
 215                         "FIELDSPEC:\n"
 216                         "    WxH[xM] (width 'x' height 'x' mines)\n"
 217                         "    defaults to 30x16x99; mines will be ~20%% if not given\n"
 218                         "\n"
 219                         "Keybindings:\n"
 220                         "    hjkl: move left/down/up/right\n"
 221                         "    bduw: move to next boundary\n"
 222                         "    ^Gg$: move to the left/bottom/top/right\n"
 223                         "    o:    open/choord\n"
 224                         "    i:    flag/unflag\n"
 225                         "    space:modeful cursor (either open or flag)\n"
 226                         "    a:    toggle mode for space (open/flag)\n"
 227                         "    mX:   set a mark for letter X\n"
 228                         "    `X:   move to mark X (aliased to ')\n"
 229                         "    r:    start a new game\n"
 230                         "    q:    quit\n", argv[0]);
 231                         _exit(0);
 232                 }
 233         }
 234         /* end parse options*/
 235         if (optind < argc) { /* parse Fieldspec */
 236                 int n = sscanf (argv[optind], "%dx%dx%d", &f.w, &f.h, &f.m);
 237                 struct winsize w;
 238                 ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 239 #define CW op.scheme->cell_width
 240 #define WW w.ws_col /*window width  */
 241 #define WH w.ws_row /*window height */
 242 #define FW f.w      /* field width  */
 243 #define FH f.h      /* field height */
 244 #define MM 231      /* mouse maximum*/
 245 #define LB 2        /*  left border */
 246 #define RB 2        /* right border */
 247 #define TB 3        /*   top border */
 248 #define BB 2        /*bottom border */
 249
 250                 if (LB + FW*CW + RB > WW) FW = WW/CW - (LB+RB);
 251                 if (TB + FH    + BB > WH) FH = WH    - (TB+BB);
 252                 if (LB + FW*CW      > MM) FW = MM/CW - LB;
 253                 if (TB + FH         > MM) FH = MM    - TB;
 254
 255                 if (n == 1) {
 256                         fprintf (stderr, "Provide at least width and height to the Fieldspec.\r\n");
 257                         return 0;
 258                 } else if (n == 2) {
 259                         if (f.w < 30) f.m = f.w*f.h*.15625;
 260                         else f.m = f.w*f.h*.20625;
 261                         //hc: .35416_
 262                 }
 263 #undef CW
 264 #undef WW
 265 #undef WH
 266 #undef FW
 267 #undef FH
 268 #undef MM
 269 #undef LB
 270 #undef RB
 271 #undef TB
 272 #undef BB
 273         } else { /* use defaults */
 274                 f.w = 30;
 275                 f.h = 16;
 276                 f.m = 99;
 277         }
 278         /* check boundaries */
 279         if (f.m > (f.w-1) * (f.h-1)) {
 280                 f.m = (f.w-1) * (f.h-1);
 281                 fprintf (stderr, "too many mines. reduced to %d.\r\n", f.m);
 282         }
 283         /* end check */
 284
 285 newgame:
 286         f.c = alloc_array (f.h, f.w);
 287
 288         f.f = 0;
 289         f.t = 0;
 290         f.p[0] = 0;
 291         f.p[1] = 0;
 292
 293         int is_newgame = 1;
 294         int cheatmode = 0;
 295         f.s = MODE_OPEN;
 296         struct line_col markers[26];
 297         for (int i=26; i; markers[--i].l = -1);
 298
 299         /* switch to alternate screen */
 300         printf ("\033[?47h");
 301         alt_screen = 1;
 302         /* reset cursor, clear screen */
 303         printf ("\033[H\033[J");
 304
 305         /* swich charset, if necessary */
 306         if (op.scheme->init_seq != NULL) print (op.scheme->init_seq);
 307
 308         show_minefield (NORMAL);
 309
 310         /* enable mouse, hide cursor */
 311         printf ("\033[?1000h\033[?25l");
 312
 313         while (1) {
 314                 int l, c;
 315                 int action;
 316                 unsigned char mouse[3];
 317
 318                 action = getch(mouse);
 319                 switch (action) {
 320                 case ' ':
 321                         if (f.s == MODE_OPEN ||
 322                             f.c[f.p[0]][f.p[1]].o == OPENED) {
 323                                 switch (do_uncover(&is_newgame)) {
 324                                         case GAME_LOST: goto lose;
 325                                         case GAME_WON:  goto win;
 326                                 }
 327                         } else if (f.s == MODE_FLAG) {
 328                                 flag_square (f.p[0], f.p[1]);
 329                         } else if (f.s ==  MODE_QUESM) {
 330                                 quesm_square (f.p[0], f.p[1]);
 331                         }
 332                         break;
 333                 case 'a':
 334                         f.s = (f.s+1)%(op.mode+1);
 335                         show_minefield (cheatmode?SHOWMINES:NORMAL);
 336                         break;
 337                 case CTRSEQ_MOUSE_LEFT:
 338                         f.p[0] = screen2field_l (mouse[2]);
 339                         f.p[1] = screen2field_c (mouse[1]);
 340                         /* :D clicked: TODO: won't work in single-width mode! */
 341                         if (mouse[2] == LINE_OFFSET-1 &&
 342                            (mouse[1] == f.w+COL_OFFSET ||
 343                             mouse[1] == f.w+COL_OFFSET+1)) {
 344                                 free_field ();
 345                                 goto newgame;
 346                         }
 347                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 348                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 349                         /* fallthrough */
 350                 case 'o':
 351                         switch (do_uncover(&is_newgame)) {
 352                                 case GAME_LOST: goto lose;
 353                                 case GAME_WON:  goto win;
 354                         }
 355                         break;
 356                 case CTRSEQ_MOUSE_RIGHT:
 357                         f.p[0] = screen2field_l (mouse[2]);
 358                         f.p[1] = screen2field_c (mouse[1]);
 359                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 360                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 361                         /* fallthrough */
 362                 case 'i': flag_square (f.p[0], f.p[1]); break;
 363                 case '?':quesm_square (f.p[0], f.p[1]); break;
 364                 case 'h': cursor_move (f.p[0],    f.p[1]-1 ); break;
 365                 case 'j': cursor_move (f.p[0]+1,  f.p[1]   ); break;
 366                 case 'k': cursor_move (f.p[0]-1,  f.p[1]   ); break;
 367                 case 'l': cursor_move (f.p[0],    f.p[1]+1 ); break;
 368                 case 'w': to_next_boundary (f.p[0], f.p[1], '>'); break;
 369                 case 'b': to_next_boundary (f.p[0], f.p[1], '<'); break;
 370                 case 'u': to_next_boundary (f.p[0], f.p[1], '^'); break;
 371                 case 'd': to_next_boundary (f.p[0], f.p[1], 'v'); break;
 372                 case '0': /* fallthrough */
 373                 case '^': cursor_move (f.p[0],    0        ); break;
 374                 case '$': cursor_move (f.p[0],    f.w-1    ); break;
 375                 case 'g': cursor_move (0,         f.p[1]   ); break;
 376                 case 'G': cursor_move (f.h-1,     f.p[1]   ); break;
 377                 case 'm':
 378                         action = tolower(getch(mouse));
 379                         if (action < 'a' || action > 'z') break;/*out of bound*/
 380                         markers[action-'a'].l = f.p[0];
 381                         markers[action-'a'].c = f.p[1];
 382                         break;
 383                 case'\'': /* fallthrough */
 384                 case '`':
 385                         action = tolower(getch(mouse));
 386                         if (action < 'a' || action > 'z' /* out of bound or */
 387                             || markers[action-'a'].l == -1) break; /* unset */
 388                         cursor_move (markers[action-'a'].l, markers[action-'a'].c);
 389                         break;
 390                 case 'r': /* start a new game */
 391                         free_field ();
 392                         goto newgame;
 393                 case 'q':
 394                         goto quit;
 395                 case '\014': /* Ctrl-L -- redraw */
 396                         show_minefield (NORMAL);
 397                         break;
 398                 case '\\':
 399                         if (is_newgame) {
 400                                 is_newgame = 0;
 401                                 fill_minefield (-1, -1);
 402                                 timer_setup(1);
 403                         }
 404                         show_minefield (cheatmode?NORMAL:SHOWMINES);
 405                         cheatmode = !cheatmode;
 406                         break;
 407                 }
 408         }
 409
 410 win:
 411 lose:
 412         timer_setup(0); /* stop timer */
 413         show_minefield (SHOWMINES);
 414         int gotaction;
 415         do {
 416                 unsigned char mouse[3];
 417                 gotaction = getch(mouse);
 418                 /* :D clicked: TODO: won't work in single-width mode! */
 419                 if (gotaction==CTRSEQ_MOUSE_LEFT && mouse[2]==LINE_OFFSET-1 &&
 420                    (mouse[1]==f.w+COL_OFFSET || mouse[1]==f.w+COL_OFFSET+1)) {
 421                         free_field ();
 422                         goto newgame;
 423                 } else if (gotaction == 'r') {
 424                         free_field ();
 425                         goto newgame;
 426                 } else if (gotaction == 'q') {
 427                         goto quit;
 428                 }
 429         } while (1);
 430
 431 quit:
 432         return 0;
 433 }
 434
 435 void quit () {
 436         move(0,0); //move(f.h+LINE_OFFSET+2, 0);
 437         /* disable mouse, show cursor */
 438         printf ("\033[?9l\033[?25h");
 439         /* reset charset, if necessary */
 440         if (op.scheme && op.scheme->reset_seq) print (op.scheme->reset_seq);
 441         /* revert to primary screen */
 442         if (alt_screen) printf ("\033[?47l");
 443         free_field ();
 444         restore_term_mode(saved_term_mode);
 445 }
 446
 447 /* I haven't won as long as a cell exists, that
 448     - I haven't opened, and
 449     - is not a mine */
 450 int everything_opened () {
 451         for (int row = 0; row < f.h; row++)
 452                 for (int col = 0; col < f.w; col++)
 453                         if (f.c[row][col].o == CLOSED &&
 454                                 f.c[row][col].m == NO_MINE  ) return 0;
 455         return 1;
 456 }
 457
 458 int wait_mouse_up (int l, int c) {
 459         unsigned char mouse2[3];
 460         int level = 1;
 461         int l2, c2;
 462
 463         /* show :o face */
 464         move (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 465
 466         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 467                 /* show a pushed-in button if cursor is on minefield */
 468                 move (l+LINE_OFFSET, field2screen_c(c));
 469                 fputs (op.scheme->mouse_highlight, stdout);
 470         }
 471
 472         while (level > 0) {
 473                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 474                         /* ignore mouse wheel events: */
 475                         if (mouse2[0] & 0x40) continue;
 476
 477                         else if (mouse2[0]&3 == 3) level--; /* release event */
 478                         else level++; /* another button pressed */
 479                 }
 480         }
 481
 482         move (1, field2screen_c (f.w/2)-1); print (EMOT(SMILE)); //TODO: does not respect mode (SHOWMINES, GAME_WON, GAME_LOST)
 483         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 484                 partial_show_minefield (l, c, NORMAL);
 485         }
 486         c2 = screen2field_c(mouse2[1]);
 487         l2 = screen2field_l(mouse2[2]);
 488         return ((l2 == l) && (c2 == c));
 489 }
 490
 491 int choord_square (int line, int col) {
 492         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 493                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 494                         if (f.c[l][c].f != FLAG) {
 495                                 if (uncover_square (l, c))
 496                                          return 1;
 497                         }
 498                 }
 499         }
 500
 501         return 0;
 502 }
 503
 504 int uncover_square (int l, int c) {
 505         f.c[l][c].o = OPENED;
 506         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 507         partial_show_minefield (l, c, NORMAL);
 508
 509         if (f.c[l][c].m) {
 510                 f.c[l][c].m = DEATH_MINE;
 511                 return 1;
 512         }
 513
 514         /* check for chording */
 515         if (f.c[l][c].n == 0) {
 516                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 517                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 518                                 int newl = l + choord_l;
 519                                 int newc = c + choord_c;
 520                                 if (newl >= 0 && newl < f.h &&
 521                                     newc >= 0 && newc < f.w &&
 522                                     f.c[newl][newc].o == CLOSED &&
 523                                     uncover_square (newl, newc)) {
 524                                          return 1;
 525                                 }
 526                         }
 527                 }
 528         }
 529
 530         return 0;
 531 }
 532
 533 void flag_square (int l, int c) {
 534         if (f.c[l][c].o != CLOSED) return;
 535         /* cycles through flag/quesm/noflag (uses op.mode to detect which ones
 536         are allowed) */
 537         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 538         if (f.c[l][c].f==FLAG) f.f++;
 539         else f.f--; //WARN: breaks on `-q'!
 540         partial_show_minefield (l, c, NORMAL);
 541         move (1, op.scheme->cell_width);
 542         printf ("[%03d]", f.m - f.f);
 543 }
 544
 545 void quesm_square (int l, int c) {
 546         /* toggle question mark / none. won't turn flags into question marks.
 547         unlike flag_square, this function doesn't respect `-q'. */
 548         if      (f.c[l][c].o != CLOSED) return;
 549         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 550         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 551         partial_show_minefield (l, c, NORMAL);
 552 }
 553
 554 int do_uncover (int* is_newgame) {
 555         if (*is_newgame) {
 556                 *is_newgame = 0;
 557                 fill_minefield (f.p[0], f.p[1]);
 558                 timer_setup(1);
 559         }
 560
 561         if (f.c[f.p[0]][f.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 562         if (f.c[f.p[0]][f.p[1]].o == CLOSED) {
 563                 if (uncover_square (f.p[0], f.p[1])) return GAME_LOST;
 564         } else if (get_neighbours (f.p[0], f.p[1], 1) == 0) {
 565                 if (choord_square (f.p[0], f.p[1])) return GAME_LOST;
 566         }
 567         if (everything_opened()) return GAME_WON;
 568
 569         return GAME_INPROGRESS;
 570 }
 571
 572 void fill_minefield (int l, int c) {
 573         srand (time(0));
 574         int mines_set = f.m;
 575         while (mines_set) {
 576                 int line = rand() % f.h;
 577                 int col = rand() % f.w;
 578
 579                 if (f.c[line][col].m) {
 580                 /* skip if field already has a mine */
 581                         continue;
 582                 } else if ((line == l) && (col == c)) {
 583                 /* don't put a mine on the already opened (first click) field */
 584                         continue;
 585                 } else {
 586                         mines_set--;
 587                         f.c[line][col].m = STD_MINE;
 588                 }
 589         }
 590
 591         /* precalculate neighbours */
 592         for (int l=0; l < f.h; l++)
 593                 for (int c=0; c < f.w; c++)
 594                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 595 }
 596
 597 void move (int line, int col) {
 598         printf ("\033[%d;%dH", line+1, col+1);
 599 }
 600
 601 /* absolute coordinates! */
 602 void cursor_move (int l, int c) {
 603         partial_show_minefield (f.p[0], f.p[1], NORMAL);
 604         /* update f.p */
 605         f.p[0] = CLAMP(l, 0, f.h-1);
 606         f.p[1] = CLAMP(c, 0, f.w-1);
 607         move (f.p[0]+LINE_OFFSET, field2screen_c(f.p[1]));
 608         //fputs (op.scheme->mouse_highlight, stdout);
 609
 610         if (!f.c[f.p[0]][f.p[1]].f) print("\033[7m");//invert unless ! or ?
 611         partial_show_minefield (f.p[0], f.p[1], HIGHLIGHT);
 612         print("\033[0m");//un-invert
 613 }
 614
 615 /* to_next_boundary(): move into the supplied direction until a change in open-
 616 state or flag-state is found and move there. falls back to BIG_MOVE. */
 617 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 618         new_ ## X OP ## = BIG_MOVE;\
 619         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 620                 if ((f.c[L ][C ].o<<2 + f.c[L ][C ].f) \
 621                  != (f.c[L1][C1].o<<2 + f.c[L1][C1].f)) {\
 622                         new_ ## X = i OP 1;\
 623                         break;\
 624                 }\
 625         } while(0)
 626 void to_next_boundary (int l, int c, char direction) {
 627         int new_l = l;
 628         int new_c = c;
 629         switch (direction) {
 630         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 631         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 632         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 633         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 634         }
 635
 636         cursor_move (new_l, new_c);
 637 }
 638 #undef FIND_NEXT
 639
 640 char* cell2schema (int l, int c, int mode) {
 641         struct minecell cell = f.c[l][c];
 642         /* move past invert-ctrlsequence when highlighting the cursor: */
 643         int offset = ((mode==HIGHLIGHT)*op.scheme->flag_offset);
 644
 645         if (mode == SHOWMINES) return (
 646                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged+offset:
 647                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf+offset:
 648                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 649                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 650                 cell.o == CLOSED          ? op.scheme->field_closed:
 651                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 652          else return (
 653                 cell.f == FLAG            ? op.scheme->field_flagged+offset:
 654                 cell.f == QUESM           ? op.scheme->field_question+offset:
 655                 cell.o == CLOSED          ? op.scheme->field_closed:
 656                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 657                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 658                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 659 }
 660
 661 void partial_show_minefield (int l, int c, int mode) {
 662         move (l+LINE_OFFSET, field2screen_c(c));
 663
 664         print (cell2schema(l, c, mode));
 665 }
 666
 667 void show_minefield (int mode) {
 668         int dtime;
 669         static char modechar[] = {'*', '!', '?'};
 670
 671         move (0,0);
 672
 673         if (f.t == 0) {
 674                 dtime = 0;
 675         } else {
 676                 dtime = difftime (time(NULL), f.t);
 677         }
 678
 679         /* first line */
 680         print (op.scheme->border_top_l);
 681         printm (f.w*op.scheme->cell_width,op.scheme->border_top_m);
 682         printf ("%s\r\n", op.scheme->border_top_r);
 683         /* second line */
 684         print (op.scheme->border_status_l);
 685         printf("[%03d]", f.m - f.f); //TODO: breaks layout if >999 mines
 686         printm (f.w*op.scheme->cell_width/2-6, " ");
 687         printf ("%s", mode==SHOWMINES?everything_opened()?
 688                 EMOT(WON) : EMOT(DEAD) : EMOT(SMILE));
 689         printm (f.w*op.scheme->cell_width/2-6-4, " ");
 690         printf ("[%c] [%03d]", modechar[f.s], dtime); //TODO: modechar is too large for 8x8 field
 691         print (op.scheme->border_status_r);
 692         print ("\r\n");
 693         /* third line */
 694         print (op.scheme->border_spacer_l);
 695         printm (f.w*op.scheme->cell_width,op.scheme->border_spacer_m);
 696         print (op.scheme->border_spacer_r);
 697         print ("\r\n");
 698         /* main body */
 699         for (int l = 0; l < f.h; l++) {
 700                 print (op.scheme->border_field_l);
 701                 for (int c = 0; c < f.w; c++) {
 702                         print (cell2schema(l, c, mode));
 703                 }
 704                 print (op.scheme->border_field_r); print ("\r\n");
 705         }
 706         /* last line */
 707         print (op.scheme->border_bottom_l);
 708         printm (f.w*op.scheme->cell_width,op.scheme->border_bottom_m);
 709         print (op.scheme->border_bottom_r);
 710         print ("\r\n");
 711 }
 712
 713 int get_neighbours (int line, int col, int reduced_mode) {
 714         /* counts mines surrounding a square
 715            modes: 0=normal; 1=reduced */
 716
 717         int count = 0;
 718
 719         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 720                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 721                         if (!l && !c) continue;
 722
 723                         count += !!f.c[l][c].m;
 724                         count -= reduced_mode * f.c[l][c].f==FLAG;
 725                 }
 726         }
 727         return count;
 728 }
 729
 730 struct minecell** alloc_array (int lines, int cols) {
 731         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 732         if (a == NULL) return NULL;
 733         for (int l = 0; l < lines; l++) {
 734                 a[l] = calloc (cols, sizeof(struct minecell));
 735                 if (a[l] == NULL) goto unalloc;
 736         }
 737
 738         return a;
 739 unalloc:
 740         for (int l = 0; l < lines; l++)
 741                 free (a[l]);
 742         return NULL;
 743 }
 744
 745 void free_field () {
 746         if (f.c == NULL) return;
 747         for (int l = 0; l < f.h; l++) {
 748                 free (f.c[l]);
 749         }
 750
 751         free (f.c);
 752         f.c = NULL;
 753 }
 754
 755 int screen2field_l (int l) {
 756         return (l-LINE_OFFSET) - 1;
 757 }
 758 /* some trickery is required to extract the mouse position from the cell width,
 759 depending on wheather we are using full width characters or double line width.
 760 WARN: tested only with scheme.cell_width = 1 and scheme.cell_width = 2. */
 761 int screen2field_c (int c) {
 762         return (c-COL_OFFSET+1 - 2*(op.scheme->cell_width%2))/2 - op.scheme->cell_width/2;
 763 }
 764 int field2screen_l (int l) {
 765         return 0; //TODO: is never used, therefore not implemented
 766 }
 767 int field2screen_c (int c) {
 768         return (op.scheme->cell_width*c+COL_OFFSET - (op.scheme->cell_width%2));
 769 }
 770
 771 enum esc_states {
 772         START,
 773         ESC_SENT,
 774         CSI_SENT,
 775         MOUSE_EVENT,
 776 };
 777 int getctrlseq (unsigned char* buf) {
 778         int c;
 779         int state = START;
 780         int offset = 0x20; /* never sends control chars as data */
 781         while ((c = getchar()) != EOF) {
 782                 switch (state) {
 783                 case START:
 784                         switch (c) {
 785                         case '\033': state=ESC_SENT; break;
 786                         default: return c;
 787                         }
 788                         break;
 789                 case ESC_SENT:
 790                         switch (c) {
 791                         case '[': state=CSI_SENT; break;
 792                         default: return CTRSEQ_INVALID;
 793                         }
 794                         break;
 795                 case CSI_SENT:
 796                         switch (c) {
 797                         case 'M': state=MOUSE_EVENT; break;
 798                         default: return CTRSEQ_INVALID;
 799                         }
 800                         break;
 801                 case MOUSE_EVENT:
 802                         buf[0] = c - offset;
 803                         buf[1] = getchar() - offset;
 804                         buf[2] = getchar() - offset;
 805                         return CTRSEQ_MOUSE;
 806                 default:
 807                         return CTRSEQ_INVALID;
 808                 }
 809         }
 810         return 2;
 811 }
 812
 813 int getch(unsigned char* buf) {
 814 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 815 compatible with the ncurses implementation of same name */
 816         int action = getctrlseq(buf);
 817         int l, c;
 818         switch (action) {
 819         case CTRSEQ_MOUSE:
 820                 l = screen2field_l (buf[2]);
 821                 c = screen2field_c (buf[1]);
 822
 823                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 824                 int success = wait_mouse_up(l, c);
 825
 826                 /* mouse moved while pressed: */
 827                 if (!success) return CTRSEQ_INVALID;
 828
 829                 switch (buf[0]) {
 830                 case 0: return CTRSEQ_MOUSE_LEFT;
 831                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 832                 case 2: return CTRSEQ_MOUSE_RIGHT;
 833                 }
 834         }
 835
 836         return action;
 837 }
 838
 839 void timer_setup (int enable) {
 840         static struct itimerval tbuf;
 841         tbuf.it_interval.tv_sec  = 1;
 842         tbuf.it_interval.tv_usec = 0;
 843
 844         if (enable) {
 845                 f.t = time(NULL);
 846                 tbuf.it_value.tv_sec  = 1;
 847                 tbuf.it_value.tv_usec = 0;
 848                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 849                         perror("setitimer");
 850                         exit(1);
 851                 }
 852         } else {
 853                 tbuf.it_value.tv_sec  = 0;
 854                 tbuf.it_value.tv_usec = 0;
 855                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 856                         perror("setitimer");
 857                         exit(1);
 858                 }
 859         }
 860
 861 }