mines_2017.c

   1 /*******************************************************************************
   2  minesviiper 0.3.14
   3  By Tobias Girstmair, 2015 - 2017
   4
   5  ./minesviiper -w 16 -h 16 -m 40
   6  (see ./minesviiper -\? 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              - space 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/time.h>
  25 #include <termios.h>
  26 #include <time.h>
  27 #include <unistd.h>
  28
  29 #include "schemes.h"
  30
  31 #define LINE_OFFSET 3
  32 #define COL_OFFSET 2
  33 #define BIG_MOVE 5
  34
  35 #define MIN(a,b) (a>b?b:a)
  36 #define MAX(a,b) (a>b?a:b)
  37 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
  38 #define printm(num, str) for (int i = 0; i < num; i++) fputs (str, stdout)
  39 #define print(str) fputs (str, stdout)
  40
  41 struct minecell {
  42         unsigned m:2; /* mine?1:killmine?2:0 */
  43         unsigned o:1; /* open?1:0 */
  44         unsigned f:2; /* flagged?1:questioned?2:0 */
  45         unsigned n:4; /* 0<= neighbours <=8 */
  46 };
  47 struct minefield {
  48         struct minecell **c;
  49         //TODO: rename w, h to L, C
  50         int w; /* width */
  51         int h; /* height */
  52         int m; /* number of mines */
  53
  54         int f; /* flags counter */
  55         int t; /* time of game start */
  56         int p[2]; /* cursor position {line, col} */
  57 } f;
  58
  59 struct opt {
  60         struct minescheme* scheme;
  61         int mode; /* allow flags? quesm? */
  62 } op;
  63
  64 struct line_col {
  65         int l;
  66         int c;
  67 };
  68
  69 void fill_minefield (int, int);
  70 void move (int, int);
  71 void set_cursor_pos (int, int);
  72 int getch (unsigned char*);
  73 int getctrlseq (unsigned char*);
  74 int everything_opened ();
  75 int wait_mouse_up (int, int);
  76 void partial_show_minefield (int, int, int);
  77 void show_minefield (int);
  78 int get_neighbours (int, int, int);
  79 int uncover_square (int, int);
  80 void flag_square (int, int);
  81 void quesm_square (int, int);
  82 int choord_square (int, int);
  83 struct minecell** alloc_array (int, int);
  84 void free_field ();
  85 int screen2field_l (int);
  86 int screen2field_c (int);
  87 int field2screen_l (int);
  88 int field2screen_c (int);
  89 void quit();
  90 void signal_handler (int signum);
  91
  92 enum modes {
  93         NORMAL,
  94         REDUCED,
  95         SHOWMINES,
  96 };
  97 enum flagtypes {
  98         NOFLAG,
  99         FLAG,
 100         QUESM,
 101 };
 102 enum fieldopenstates {
 103         CLOSED,
 104         OPENED,
 105 };
 106 enum event {
 107         /* for getctrlseq() */
 108         CTRSEQ_NULL    =  0,
 109         CTRSEQ_EOF     = -1,
 110         CTRSEQ_INVALID = -2,
 111         CTRSEQ_MOUSE   = -3,
 112         /* for getch() */
 113         CTRSEQ_MOUSE_LEFT   = -4,
 114         CTRSEQ_MOUSE_MIDDLE = -5,
 115         CTRSEQ_MOUSE_RIGHT  = -6,
 116 };
 117 enum mine_types {
 118         NO_MINE,
 119         STD_MINE,
 120         DEATH_MINE,
 121 };
 122
 123 void signal_handler (int signum) {
 124         switch (signum) {
 125         case SIGALRM:
 126                 move (1, f.w*op.scheme->cell_width-(op.scheme->cell_width%2)-3);
 127                 printf ("[%03d]", f.t?(int)difftime (time(NULL), f.t):0);
 128                 break;
 129         case SIGINT:
 130                 exit(128+SIGINT);
 131         }
 132 }
 133
 134 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 135 struct termios saved_term_mode;
 136 struct termios set_raw_term_mode() {
 137         struct termios cur_term_mode, raw_term_mode;
 138
 139         tcgetattr(STDIN_FILENO, &cur_term_mode);
 140         raw_term_mode = cur_term_mode;
 141         raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 142         raw_term_mode.c_cc[VMIN] = 1 ;
 143         raw_term_mode.c_cc[VTIME] = 0;
 144         tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 145
 146         return cur_term_mode;
 147 }
 148 void restore_term_mode(struct termios saved_term_mode) {
 149         tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 150 }
 151
 152
 153 int main (int argc, char** argv) {
 154         struct itimerval tbuf;
 155         struct sigaction saction;
 156         saved_term_mode = set_raw_term_mode();
 157
 158         atexit (*quit);
 159
 160         saction.sa_handler = signal_handler;
 161         sigemptyset(&saction.sa_mask);
 162         saction.sa_flags   = 0;
 163         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 164                 perror("SIGALRM");
 165                 exit(1);
 166         }
 167         tbuf.it_interval.tv_sec  = 1;
 168         tbuf.it_interval.tv_usec = 0;
 169         tbuf.it_value.tv_sec  = 1;
 170         tbuf.it_value.tv_usec = 0;
 171
 172         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 173                 perror ("SIGINT");
 174                 exit (1);
 175         }
 176         /* end screen setup */
 177
 178         /* setup defaults */
 179         f.w = 30;
 180         f.h = 16;
 181         f.m = 99;
 182         f.c = NULL; /*to not free() array before it is allocated*/
 183
 184         op.scheme = &symbols_mono;
 185         op.mode = FLAG;
 186         /* end defaults */
 187         /* parse options */
 188         int optget;
 189         opterr = 0; /* don't print message on unrecognized option */
 190         while ((optget = getopt (argc, argv, "+w:h:m:nfqcdx")) != -1) {
 191                 switch (optget) {
 192                 case 'w': f.w        = atoi (optarg); break;
 193                 case 'h': f.h        = atoi (optarg); break;
 194                 case 'm': f.m        = atoi (optarg); break;
 195                 case 'n': op.mode    = NOFLAG; break;
 196                 case 'f': op.mode    = FLAG; break; /*default*/
 197                 case 'q': op.mode    = QUESM; break;
 198                 case 'c': op.scheme  = &symbols_col1; break;
 199                 case 'd': op.scheme  = &symbols_doublewidth; break;
 200                 case '?':
 201                         fprintf (stderr, "%s [OPTIONS]\n"
 202                         "OPTIONS:\n"
 203                         "    w(idth)\n"
 204                         "    h(eight)\n"
 205                         "    m(ines)\n"
 206                         "    n(o flagging)\n"
 207                         "    f(lagging)\n"
 208                         "    q(uestion marks)\n"
 209                         "    c(olored symbols)\n"
 210                         "    d(oublewidth symbols)\n"
 211                         "\n"
 212                         "hjkl: move 1 left/down/up/right\n"
 213                         "bduw: move 5 left/down/up/right\n"
 214                         "^Gg$: move to the left/bottom/top/right\n"
 215                         "left mouse/space: open/choord\n"
 216                         "right mouse/i: flag/unflag\n"
 217                         ":D / r: start a new game\n"
 218                         "q: quit\n", argv[0]);
 219                         return 1;
 220                 }
 221         }
 222         /* end parse options*/
 223         /* check boundaries */
 224         if (f.m > (f.w-1) * (f.h-1)) {
 225                 f.m = (f.w-1) * (f.h-1);
 226                 fprintf (stderr, "too many mines. reduced to %d.\r\n", f.m);
 227         }
 228         /* end check */
 229
 230 newgame:
 231         f.c = alloc_array (f.h, f.w);
 232
 233         f.f = 0;
 234         f.t = 0;
 235         f.p[0] = 0;
 236         f.p[1] = 0;
 237
 238         int is_newgame = 1;
 239         int cheatmode = 0;
 240         struct line_col markers[26];
 241         for (int i=26; i; markers[--i].l = -1);
 242
 243         /* switch to alternate screen */
 244         printf ("\033[?47h");
 245         /* reset cursor, clear screen */
 246         printf ("\033[H\033[J");
 247
 248         /* swich charset, if necessary */
 249         if (op.scheme->init_seq != NULL) print (op.scheme->init_seq);
 250
 251         show_minefield (NORMAL);
 252
 253         /* enable mouse, hide cursor */
 254         printf ("\033[?1000h\033[?25l");
 255
 256         while (1) {
 257                 int l, c;
 258                 int action;
 259                 unsigned char mouse[3];
 260
 261                 action = getch(mouse);
 262                 switch (action) {
 263                 case CTRSEQ_MOUSE_LEFT:
 264                         f.p[0] = screen2field_l (mouse[2]);
 265                         f.p[1] = screen2field_c (mouse[1]);
 266                         /* :D clicked: TODO: won't work in single-width mode! */
 267                         if (mouse[2] == LINE_OFFSET-1 &&
 268                            (mouse[1] == f.w+COL_OFFSET ||
 269                             mouse[1] == f.w+COL_OFFSET+1)) {
 270                                 free_field ();
 271                                 goto newgame;
 272                         }
 273                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 274                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 275                         /* fallthrough */
 276                 case ' ':
 277                         if (is_newgame) {
 278                                 is_newgame = 0;
 279                                 fill_minefield (f.p[0], f.p[1]);
 280                                 f.t = time(NULL);
 281                                 tbuf.it_value.tv_sec  = 1;
 282                                 tbuf.it_value.tv_usec = 0;
 283                                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 284                                         perror("setitimer");
 285                                         exit(1);
 286                                 }
 287                         }
 288
 289                         if (f.c[f.p[0]][f.p[1]].f == FLAG  ) break;
 290                         if (f.c[f.p[0]][f.p[1]].o == CLOSED) {
 291                                 if (uncover_square (f.p[0], f.p[1])) goto lose;
 292                         } else if (get_neighbours (f.p[0], f.p[1], 1) == 0) {
 293                                 if (choord_square (f.p[0], f.p[1])) goto lose;
 294                         }
 295                         if (everything_opened())  goto win;
 296                         break;
 297                 case CTRSEQ_MOUSE_RIGHT:
 298                         f.p[0] = screen2field_l (mouse[2]);
 299                         f.p[1] = screen2field_c (mouse[1]);
 300                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 301                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 302                         /* fallthrough */
 303                 case 'i': flag_square (f.p[0], f.p[1]); break;
 304                 case '?':quesm_square (f.p[0], f.p[1]); break;
 305                 #define BM BIG_MOVE
 306                 case 'h': set_cursor_pos (f.p[0],    f.p[1]-1 ); break;
 307                 case 'j': set_cursor_pos (f.p[0]+1,  f.p[1]   ); break;
 308                 case 'k': set_cursor_pos (f.p[0]-1,  f.p[1]   ); break;
 309                 case 'l': set_cursor_pos (f.p[0],    f.p[1]+1 ); break;
 310                 case 'w': set_cursor_pos (f.p[0],    f.p[1]+BM); break;
 311                 case 'b': set_cursor_pos (f.p[0],    f.p[1]-BM); break;
 312                 case 'u': set_cursor_pos (f.p[0]-BM, f.p[1]   ); break;
 313                 case 'd': set_cursor_pos (f.p[0]+BM, f.p[1]   ); break;
 314                 case '0': /* fallthrough */
 315                 case '^': set_cursor_pos (f.p[0],    0        ); break;
 316                 case '$': set_cursor_pos (f.p[0],    f.w-1    ); break;
 317                 case 'g': set_cursor_pos (0,         f.p[1]   ); break;
 318                 case 'G': set_cursor_pos (f.h-1,     f.p[1]   ); break;
 319                 #undef BM
 320                 case 'm':
 321                         action = tolower(getch(mouse));
 322                         if (action < 'a' || action > 'z') break;/*out of bound*/
 323                         markers[action-'a'].l = f.p[0];
 324                         markers[action-'a'].c = f.p[1];
 325                         break;
 326                 case'\'': /* fallthrough */
 327                 case '`':
 328                         action = tolower(getch(mouse));
 329                         if (action < 'a' || action > 'z' /* out of bound or */
 330                             || markers[action-'a'].l == -1) break; /* unset */
 331                         set_cursor_pos (markers[action-'a'].l, markers[action-'a'].c);
 332                         break;
 333                 case 'r': /* start a new game */
 334                         free_field ();
 335                         goto newgame;
 336                 case 'q':
 337                         goto quit;
 338                 case '\014': /* Ctrl-L -- redraw */
 339                         show_minefield (NORMAL);
 340                         break;
 341                 case '\\':
 342                         if (is_newgame) {
 343                                 is_newgame = 0;
 344                                 fill_minefield (-1, -1);
 345                                 f.t = time(NULL);
 346                                 setitimer (ITIMER_REAL, &tbuf, NULL);
 347                         }
 348                         show_minefield (cheatmode?NORMAL:SHOWMINES);
 349                         cheatmode = !cheatmode;
 350                         break;
 351                 }
 352         }
 353
 354 win:
 355 lose:
 356         /* stop timer: */
 357         tbuf.it_value.tv_sec  = 0;
 358         tbuf.it_value.tv_usec = 0;
 359         if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 360                 perror("setitimer");
 361                 exit(1);
 362         }
 363         show_minefield (SHOWMINES);
 364         int gotaction;
 365         do {
 366                 unsigned char mouse[3];
 367                 gotaction = getch(mouse);
 368                 /* :D clicked: TODO: won't work in single-width mode! */
 369                 if (gotaction==CTRSEQ_MOUSE_LEFT && mouse[2]==LINE_OFFSET-1 &&
 370                    (mouse[1]==f.w+COL_OFFSET || mouse[1]==f.w+COL_OFFSET+1)) {
 371                         free_field ();
 372                         goto newgame;
 373                 } else if (gotaction == 'r') {
 374                         free_field ();
 375                         goto newgame;
 376                 } else if (gotaction == 'q') {
 377                         goto quit;
 378                 }
 379         } while (1);
 380
 381 quit:
 382         return 0;
 383 }
 384
 385 void quit () {
 386         move(f.h+LINE_OFFSET+2, 0);
 387         /* disable mouse, show cursor */
 388         printf ("\033[?9l\033[?25h");
 389         /* reset charset, if necessary */
 390         if (op.scheme && op.scheme->reset_seq) print (op.scheme->reset_seq);
 391         /* revert to primary screen */
 392         printf ("\033[?47l");
 393         free_field ();
 394         restore_term_mode(saved_term_mode);
 395 }
 396
 397 /* I haven't won as long as a cell exists, that
 398     - I haven't opened, and
 399     - is not a mine */
 400 int everything_opened () {
 401         for (int row = 0; row < f.h; row++)
 402                 for (int col = 0; col < f.w; col++)
 403                         if (f.c[row][col].o == CLOSED &&
 404                                 f.c[row][col].m == NO_MINE  ) return 0;
 405         return 1;
 406 }
 407
 408 int wait_mouse_up (int l, int c) {
 409         unsigned char mouse2[3];
 410         int level = 1;
 411         int l2, c2;
 412
 413         /* show :o face */
 414         move (1, field2screen_c (f.w/2)-1); print (":o");
 415
 416         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 417                 /* show a pushed-in button if cursor is on minefield */
 418                 move (l+LINE_OFFSET, field2screen_c(c));
 419                 fputs (op.scheme->mouse_highlight, stdout);
 420         }
 421
 422         while (level > 0) {
 423                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 424                         /* ignore mouse wheel events: */
 425                         if (mouse2[0] & 0x40) continue;
 426
 427                         else if (mouse2[0]&3 == 3) level--; /* release event */
 428                         else level++; /* another button pressed */
 429                 }
 430         }
 431
 432         move (1, field2screen_c (f.w/2)-1); print (":D");
 433         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 434                 partial_show_minefield (l, c, NORMAL);
 435         }
 436         c2 = screen2field_c(mouse2[1]);
 437         l2 = screen2field_l(mouse2[2]);
 438         return ((l2 == l) && (c2 == c));
 439 }
 440
 441 int choord_square (int line, int col) {
 442         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 443                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 444                         if (f.c[l][c].f != FLAG) {
 445                                 if (uncover_square (l, c))
 446                                          return 1;
 447                         }
 448                 }
 449         }
 450
 451         return 0;
 452 }
 453
 454 int uncover_square (int l, int c) {
 455         f.c[l][c].o = OPENED;
 456         f.c[l][c].f = NOFLAG; /* must not be QUESM, otherwise rendering issues */
 457         partial_show_minefield (l, c, NORMAL);
 458
 459         if (f.c[l][c].m) {
 460                 f.c[l][c].m = DEATH_MINE;
 461                 return 1;
 462         }
 463
 464         /* check for chording */
 465         if (f.c[l][c].n == 0) {
 466                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 467                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 468                                 int newl = l + choord_l;
 469                                 int newc = c + choord_c;
 470                                 if (newl >= 0 && newl < f.h &&
 471                                     newc >= 0 && newc < f.w &&
 472                                     f.c[newl][newc].o == CLOSED &&
 473                                     uncover_square (newl, newc)) {
 474                                          return 1;
 475                                 }
 476                         }
 477                 }
 478         }
 479
 480         return 0;
 481 }
 482
 483 void flag_square (int l, int c) {
 484         if (f.c[l][c].o != CLOSED) return;
 485         /* cycles through flag/quesm/noflag (uses op.mode to detect which ones
 486         are allowed) */
 487         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 488         if (f.c[l][c].f==FLAG) f.f++;
 489         else f.f--;
 490         partial_show_minefield (l, c, NORMAL);
 491         move (1, op.scheme->cell_width);
 492         printf ("[%03d]", f.f);
 493 }
 494
 495 void quesm_square (int l, int c) {
 496         /* toggle question mark / none. won't turn flags into question marks.
 497         unlike flag_square, this function doesn't respect `-q'. */
 498         if      (f.c[l][c].o != CLOSED) return;
 499         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 500         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 501         partial_show_minefield (l, c, NORMAL);
 502 }
 503
 504 void fill_minefield (int l, int c) {
 505         srand (time(0));
 506         int mines_set = f.m;
 507         while (mines_set) {
 508                 int line = rand() % f.h;
 509                 int col = rand() % f.w;
 510
 511                 if (f.c[line][col].m) {
 512                 /* skip if field already has a mine */
 513                         continue;
 514                 } else if ((line == l) && (col == c)) {
 515                 /* don't put a mine on the already opened (first click) field */
 516                         continue;
 517                 } else {
 518                         mines_set--;
 519                         f.c[line][col].m = STD_MINE;
 520                 }
 521         }
 522
 523         /* precalculate neighbours */
 524         for (int l=0; l < f.h; l++)
 525                 for (int c=0; c < f.w; c++)
 526                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 527 }
 528
 529 void move (int line, int col) {
 530         printf ("\033[%d;%dH", line+1, col+1);
 531 }
 532
 533 /* absolute coordinates! */
 534 void set_cursor_pos (int l, int c) {
 535         partial_show_minefield (f.p[0], f.p[1], NORMAL);
 536         /* update f.p */
 537         f.p[0] = CLAMP(l, 0, f.h-1);
 538         f.p[1] = CLAMP(c, 0, f.w-1);
 539         move (f.p[0]+LINE_OFFSET, field2screen_c(f.p[1]));
 540         fputs (op.scheme->mouse_highlight, stdout);
 541 }
 542
 543 void partial_show_minefield (int l, int c, int mode) {
 544         move (l+LINE_OFFSET, field2screen_c(c));
 545
 546         if      (f.c[l][c].f == FLAG      ) print (op.scheme->field_flagged);
 547         else if (f.c[l][c].f == QUESM     ) print (op.scheme->field_question);
 548         else if (f.c[l][c].o == CLOSED    ) print (op.scheme->field_closed);
 549         else if (f.c[l][c].m == STD_MINE ||
 550                  f.c[l][c].m == DEATH_MINE) print (op.scheme->mine_normal);
 551         else    /*.......................*/ print (op.scheme->number[f.c[l][c].n]);
 552 }
 553
 554 void show_minefield (int mode) {
 555         int dtime;
 556
 557         move (0,0);
 558
 559         if (f.t == 0) {
 560                 dtime = 0;
 561         } else {
 562                 dtime = difftime (time(NULL), f.t);
 563         }
 564
 565         /* first line */
 566         print (op.scheme->border_top_l);
 567         printm (f.w*op.scheme->cell_width,op.scheme->border_top_m);
 568         printf ("%s\r\n", op.scheme->border_top_r);
 569         /* second line */
 570         print (op.scheme->border_status_l);
 571         printf("[%03d]", f.f);
 572         printm (f.w*op.scheme->cell_width/2-6, " ");
 573         printf ("%s", mode==SHOWMINES?":C":":D");
 574         printm (f.w*op.scheme->cell_width/2-6, " ");
 575         printf ("[%03d]", dtime);
 576         print (op.scheme->border_status_r);
 577         print ("\r\n");
 578         /* third line */
 579         print (op.scheme->border_spacer_l);
 580         printm (f.w*op.scheme->cell_width,op.scheme->border_spacer_m);
 581         print (op.scheme->border_spacer_r);
 582         print ("\r\n");
 583         /* main body */
 584         for (int l = 0; l < f.h; l++) {
 585                 print (op.scheme->border_field_l);
 586                 for (int c = 0; c < f.w; c++) {
 587                         if (mode == SHOWMINES) {
 588                                 if      (f.c[l][c].f == FLAG &&
 589                                          f.c[l][c].m              ) print (op.scheme->field_flagged);
 590                                 else if (f.c[l][c].f == FLAG &&
 591                                          f.c[l][c].m == NO_MINE   ) print (op.scheme->mine_wrongf);
 592                                 else if (f.c[l][c].m == STD_MINE  ) print (op.scheme->mine_normal);
 593                                 else if (f.c[l][c].m == DEATH_MINE) print (op.scheme->mine_death);
 594                                 else if (f.c[l][c].o == CLOSED    ) print (op.scheme->field_closed);
 595                                 else    /*.......................*/ print (op.scheme->number[f.c[l][c].n]);
 596                         } else {
 597                                 if      (f.c[l][c].f == FLAG      ) print (op.scheme->field_flagged);
 598                                 else if (f.c[l][c].f == QUESM     ) print (op.scheme->field_question);
 599                                 else if (f.c[l][c].o == CLOSED    ) print (op.scheme->field_closed);
 600                                 else if (f.c[l][c].m == STD_MINE  ) print (op.scheme->mine_normal);
 601                                 else if (f.c[l][c].m == DEATH_MINE) print (op.scheme->mine_death);
 602                                 else    /*.......................*/ print (op.scheme->number[f.c[l][c].n]);
 603                         }
 604                 }
 605                 print (op.scheme->border_field_r); print ("\r\n");
 606         }
 607         /* last line */
 608         print (op.scheme->border_bottom_l);
 609         printm (f.w*op.scheme->cell_width,op.scheme->border_bottom_m);
 610         print (op.scheme->border_bottom_r);
 611         print ("\r\n");
 612 }
 613
 614 int get_neighbours (int line, int col, int reduced_mode) {
 615         /* counts mines surrounding a square
 616            modes: 0=normal; 1=reduced */
 617
 618         int count = 0;
 619
 620         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 621                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 622                         if (!l && !c) continue;
 623
 624                         count += !!f.c[l][c].m;
 625                         count -= reduced_mode * f.c[l][c].f==FLAG;
 626                 }
 627         }
 628         return count;
 629 }
 630
 631 struct minecell** alloc_array (int lines, int cols) {
 632         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 633         if (a == NULL) return NULL;
 634         for (int l = 0; l < lines; l++) {
 635                 a[l] = calloc (cols, sizeof(struct minecell));
 636                 if (a[l] == NULL) goto unalloc;
 637         }
 638
 639         return a;
 640 unalloc:
 641         for (int l = 0; l < lines; l++)
 642                 free (a[l]);
 643         return NULL;
 644 }
 645
 646 void free_field () {
 647         if (f.c == NULL) return;
 648         for (int l = 0; l < f.h; l++) {
 649                 free (f.c[l]);
 650         }
 651         free (f.c);
 652 }
 653
 654 int screen2field_l (int l) {
 655         return (l-LINE_OFFSET) - 1;
 656 }
 657 /* some trickery is required to extract the mouse position from the cell width,
 658 depending on wheather we are using full width characters or double line width.
 659 WARN: tested only with scheme.cell_width = 1 and scheme.cell_width = 2. */
 660 int screen2field_c (int c) {
 661         return (c-COL_OFFSET+1 - 2*(op.scheme->cell_width%2))/2 - op.scheme->cell_width/2;
 662 }
 663 int field2screen_l (int l) {
 664         return 0; //TODO: is never used, therefore not implemented
 665 }
 666 int field2screen_c (int c) {
 667         return (op.scheme->cell_width*c+COL_OFFSET - (op.scheme->cell_width%2));
 668 }
 669
 670 enum esc_states {
 671         START,
 672         ESC_SENT,
 673         CSI_SENT,
 674         MOUSE_EVENT,
 675 };
 676 int getctrlseq (unsigned char* buf) {
 677         int c;
 678         int state = START;
 679         int offset = 0x20; /* never sends control chars as data */
 680         while ((c = getchar()) != EOF) {
 681                 switch (state) {
 682                 case START:
 683                         switch (c) {
 684                         case '\033': state=ESC_SENT; break;
 685                         default: return c;
 686                         }
 687                         break;
 688                 case ESC_SENT:
 689                         switch (c) {
 690                         case '[': state=CSI_SENT; break;
 691                         default: return CTRSEQ_INVALID;
 692                         }
 693                         break;
 694                 case CSI_SENT:
 695                         switch (c) {
 696                         case 'M': state=MOUSE_EVENT; break;
 697                         default: return CTRSEQ_INVALID;
 698                         }
 699                         break;
 700                 case MOUSE_EVENT:
 701                         buf[0] = c - offset;
 702                         buf[1] = getchar() - offset;
 703                         buf[2] = getchar() - offset;
 704                         return CTRSEQ_MOUSE;
 705                 default:
 706                         return CTRSEQ_INVALID;
 707                 }
 708         }
 709         return 2;
 710 }
 711
 712 int getch(unsigned char* buf) {
 713 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 714 compatible with the ncurses implementation of same name */
 715         int action = getctrlseq(buf);
 716         int l, c;
 717         switch (action) {
 718         case CTRSEQ_MOUSE:
 719                 l = screen2field_l (buf[2]);
 720                 c = screen2field_c (buf[1]);
 721
 722                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 723                 int success = wait_mouse_up(l, c);
 724
 725                 /* mouse moved while pressed: */
 726                 if (!success) return CTRSEQ_INVALID;
 727
 728                 switch (buf[0]) {
 729                 case 0: return CTRSEQ_MOUSE_LEFT;
 730                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 731                 case 2: return CTRSEQ_MOUSE_RIGHT;
 732                 }
 733         }
 734
 735         return action;
 736 }