mines_2017.c

   1 /*******************************************************************************
   2  minesviiper 0.3.145
   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/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 int alt_screen = 0;
  65
  66 struct line_col {
  67         int l;
  68         int c;
  69 };
  70
  71 void fill_minefield (int, int);
  72 void move (int, int);
  73 void cursor_move (int, int);
  74 int getch (unsigned char*);
  75 int getctrlseq (unsigned char*);
  76 int everything_opened ();
  77 int wait_mouse_up (int, int);
  78 void partial_show_minefield (int, int, int);
  79 void show_minefield (int);
  80 int get_neighbours (int, int, int);
  81 int uncover_square (int, int);
  82 void flag_square (int, int);
  83 void quesm_square (int, int);
  84 int choord_square (int, int);
  85 int do_uncover (int*);
  86 struct minecell** alloc_array (int, int);
  87 void free_field ();
  88 int screen2field_l (int);
  89 int screen2field_c (int);
  90 int field2screen_l (int);
  91 int field2screen_c (int);
  92 void quit();
  93 void signal_handler (int signum);
  94 void timer_setup (int);
  95
  96 enum modes {
  97         NORMAL,
  98         REDUCED,
  99         SHOWMINES,
 100         HIGHLIGHT,
 101 };
 102 enum flagtypes {
 103         NOFLAG,
 104         FLAG,
 105         QUESM,
 106 };
 107 enum fieldopenstates {
 108         CLOSED,
 109         OPENED,
 110 };
 111 enum game_states {
 112         GAME_INPROGRESS,
 113         GAME_NEW,
 114         GAME_WON,
 115         GAME_LOST,
 116 };
 117 enum space_modes {
 118         MODE_OPEN,
 119         MODE_FLAG,
 120         MODE_QUESM,
 121 };
 122 enum event {
 123         /* for getctrlseq() */
 124         CTRSEQ_NULL    =  0,
 125         CTRSEQ_EOF     = -1,
 126         CTRSEQ_INVALID = -2,
 127         CTRSEQ_MOUSE   = -3,
 128         /* for getch() */
 129         CTRSEQ_MOUSE_LEFT   = -4,
 130         CTRSEQ_MOUSE_MIDDLE = -5,
 131         CTRSEQ_MOUSE_RIGHT  = -6,
 132 };
 133 enum mine_types {
 134         NO_MINE,
 135         STD_MINE,
 136         DEATH_MINE,
 137 };
 138
 139 void signal_handler (int signum) {
 140         switch (signum) {
 141         case SIGALRM:
 142                 move (1, f.w*op.scheme->cell_width-(op.scheme->cell_width%2)-3);
 143                 printf ("[%03d]", f.t?(int)difftime (time(NULL), f.t):0);
 144                 break;
 145         case SIGINT:
 146                 exit(128+SIGINT);
 147         }
 148 }
 149
 150 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 151 struct termios saved_term_mode;
 152 struct termios set_raw_term_mode() {
 153         struct termios cur_term_mode, raw_term_mode;
 154
 155         tcgetattr(STDIN_FILENO, &cur_term_mode);
 156         raw_term_mode = cur_term_mode;
 157         raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 158         raw_term_mode.c_cc[VMIN] = 1 ;
 159         raw_term_mode.c_cc[VTIME] = 0;
 160         tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 161
 162         return cur_term_mode;
 163 }
 164 void restore_term_mode(struct termios saved_term_mode) {
 165         tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 166 }
 167
 168
 169 int main (int argc, char** argv) {
 170         struct sigaction saction;
 171         saved_term_mode = set_raw_term_mode();
 172
 173         atexit (*quit);
 174
 175         saction.sa_handler = signal_handler;
 176         sigemptyset(&saction.sa_mask);
 177         saction.sa_flags   = 0;
 178         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 179                 perror("SIGALRM");
 180                 exit(1);
 181         }
 182
 183         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 184                 perror ("SIGINT");
 185                 exit (1);
 186         }
 187         /* end screen setup */
 188
 189         /* setup defaults */
 190         f.w = 30;
 191         f.h = 16;
 192         f.m = 99;
 193         f.c = NULL; /*to not free() array before it is allocated*/
 194
 195         op.scheme = &symbols_mono;
 196         op.mode = FLAG;
 197         /* end defaults */
 198         /* parse options */
 199         int optget;
 200         opterr = 0; /* don't print message on unrecognized option */
 201         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
 202                 switch (optget) {
 203                 case 'n': op.mode    = NOFLAG; break;
 204                 case 'f': op.mode    = FLAG; break; /*default*/
 205                 case 'q': op.mode    = QUESM; break;
 206                 case 'c': op.scheme  = &symbols_col1; break;
 207                 case 'd': op.scheme  = &symbols_doublewidth; break;
 208                 case 'h':
 209                 default:
 210                         fprintf (stderr, "%s [OPTIONS] [FIELDSPEC]\n"
 211                         "OPTIONS:\n"
 212                         "    -n(o flagging)\n"
 213                         "    -f(lagging)\n"
 214                         "    -q(uestion marks)\n"
 215                         "    -c(olored symbols)\n"
 216                         "    -d(ec charset symbols)\n"
 217                         "FIELDSPEC:\n"
 218                         "    WxHxM (width 'x' height 'x' mines)\n"
 219                         "    defaults to 30x16x99\n"
 220                         "\n"
 221                         "hjkl: move 1 left/down/up/right\n"
 222                         "bduw: move 5 left/down/up/right\n"
 223                         "^Gg$: move to the left/bottom/top/right\n"
 224                         "left mouse/o: open/choord\n"
 225                         "right mouse/i: flag/unflag\n"
 226                         "space: modeful cursor (either open or flag)\n"
 227                         "a: toggle mode for space (open/flag)\n"
 228                         ":D / r: start a new game\n"
 229                         "q: quit\n", argv[0]);
 230                         _exit(0);
 231                 }
 232         }
 233         /* end parse options*/
 234         if (optind < argc) {
 235                 sscanf (argv[optind], "%dx%dx%d", &(f.w), &(f.h), &(f.m));
 236         }
 237         /* check boundaries */
 238         if (f.m > (f.w-1) * (f.h-1)) {
 239                 f.m = (f.w-1) * (f.h-1);
 240                 fprintf (stderr, "too many mines. reduced to %d.\r\n", f.m);
 241         }
 242         /* end check */
 243
 244 newgame:
 245         f.c = alloc_array (f.h, f.w);
 246
 247         f.f = 0;
 248         f.t = 0;
 249         f.p[0] = 0;
 250         f.p[1] = 0;
 251
 252         int is_newgame = 1;
 253         int cheatmode = 0;
 254         int space_mode = MODE_OPEN;
 255         struct line_col markers[26];
 256         for (int i=26; i; markers[--i].l = -1);
 257
 258         /* switch to alternate screen */
 259         printf ("\033[?47h");
 260         alt_screen = 1;
 261         /* reset cursor, clear screen */
 262         printf ("\033[H\033[J");
 263
 264         /* swich charset, if necessary */
 265         if (op.scheme->init_seq != NULL) print (op.scheme->init_seq);
 266
 267         show_minefield (NORMAL);
 268
 269         /* enable mouse, hide cursor */
 270         printf ("\033[?1000h\033[?25l");
 271
 272         while (1) {
 273                 int l, c;
 274                 int action;
 275                 unsigned char mouse[3];
 276
 277                 action = getch(mouse);
 278                 switch (action) {
 279                 case ' ':
 280                         if (space_mode == MODE_OPEN ||
 281                             f.c[f.p[0]][f.p[1]].o == OPENED) {
 282                                 switch (do_uncover(&is_newgame)) {
 283                                         case GAME_LOST: goto lose;
 284                                         case GAME_WON:  goto win;
 285                                 }
 286                         } else if (space_mode == MODE_FLAG) {
 287                                 flag_square (f.p[0], f.p[1]);
 288                         } else if (space_mode ==  MODE_QUESM) {
 289                                 quesm_square (f.p[0], f.p[1]);
 290                         }
 291                         break;
 292                 case 'a': space_mode = (space_mode+1)%(op.mode+1); break;
 293                 case CTRSEQ_MOUSE_LEFT:
 294                         f.p[0] = screen2field_l (mouse[2]);
 295                         f.p[1] = screen2field_c (mouse[1]);
 296                         /* :D clicked: TODO: won't work in single-width mode! */
 297                         if (mouse[2] == LINE_OFFSET-1 &&
 298                            (mouse[1] == f.w+COL_OFFSET ||
 299                             mouse[1] == f.w+COL_OFFSET+1)) {
 300                                 free_field ();
 301                                 goto newgame;
 302                         }
 303                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 304                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 305                         /* fallthrough */
 306                 case 'o':
 307                         switch (do_uncover(&is_newgame)) {
 308                                 case GAME_LOST: goto lose;
 309                                 case GAME_WON:  goto win;
 310                         }
 311                         break;
 312                 case CTRSEQ_MOUSE_RIGHT:
 313                         f.p[0] = screen2field_l (mouse[2]);
 314                         f.p[1] = screen2field_c (mouse[1]);
 315                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 316                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 317                         /* fallthrough */
 318                 case 'i': flag_square (f.p[0], f.p[1]); break;
 319                 case '?':quesm_square (f.p[0], f.p[1]); break;
 320                 #define BM BIG_MOVE
 321                 case 'h': cursor_move (f.p[0],    f.p[1]-1 ); break;
 322                 case 'j': cursor_move (f.p[0]+1,  f.p[1]   ); break;
 323                 case 'k': cursor_move (f.p[0]-1,  f.p[1]   ); break;
 324                 case 'l': cursor_move (f.p[0],    f.p[1]+1 ); break;
 325                 case 'w': cursor_move (f.p[0],    f.p[1]+BM); break;
 326                 case 'b': cursor_move (f.p[0],    f.p[1]-BM); break;
 327                 case 'u': cursor_move (f.p[0]-BM, f.p[1]   ); break;
 328                 case 'd': cursor_move (f.p[0]+BM, f.p[1]   ); break;
 329                 case '0': /* fallthrough */
 330                 case '^': cursor_move (f.p[0],    0        ); break;
 331                 case '$': cursor_move (f.p[0],    f.w-1    ); break;
 332                 case 'g': cursor_move (0,         f.p[1]   ); break;
 333                 case 'G': cursor_move (f.h-1,     f.p[1]   ); break;
 334                 #undef BM
 335                 case 'm':
 336                         action = tolower(getch(mouse));
 337                         if (action < 'a' || action > 'z') break;/*out of bound*/
 338                         markers[action-'a'].l = f.p[0];
 339                         markers[action-'a'].c = f.p[1];
 340                         break;
 341                 case'\'': /* fallthrough */
 342                 case '`':
 343                         action = tolower(getch(mouse));
 344                         if (action < 'a' || action > 'z' /* out of bound or */
 345                             || markers[action-'a'].l == -1) break; /* unset */
 346                         cursor_move (markers[action-'a'].l, markers[action-'a'].c);
 347                         break;
 348                 case 'r': /* start a new game */
 349                         free_field ();
 350                         goto newgame;
 351                 case 'q':
 352                         goto quit;
 353                 case '\014': /* Ctrl-L -- redraw */
 354                         show_minefield (NORMAL);
 355                         break;
 356                 case '\\':
 357                         if (is_newgame) {
 358                                 is_newgame = 0;
 359                                 fill_minefield (-1, -1);
 360                                 timer_setup(1);
 361                         }
 362                         show_minefield (cheatmode?NORMAL:SHOWMINES);
 363                         cheatmode = !cheatmode;
 364                         break;
 365                 }
 366         }
 367
 368 win:
 369 lose:
 370         timer_setup(0); /* stop timer */
 371         show_minefield (SHOWMINES);
 372         int gotaction;
 373         do {
 374                 unsigned char mouse[3];
 375                 gotaction = getch(mouse);
 376                 /* :D clicked: TODO: won't work in single-width mode! */
 377                 if (gotaction==CTRSEQ_MOUSE_LEFT && mouse[2]==LINE_OFFSET-1 &&
 378                    (mouse[1]==f.w+COL_OFFSET || mouse[1]==f.w+COL_OFFSET+1)) {
 379                         free_field ();
 380                         goto newgame;
 381                 } else if (gotaction == 'r') {
 382                         free_field ();
 383                         goto newgame;
 384                 } else if (gotaction == 'q') {
 385                         goto quit;
 386                 }
 387         } while (1);
 388
 389 quit:
 390         return 0;
 391 }
 392
 393 void quit () {
 394         move(0,0); //move(f.h+LINE_OFFSET+2, 0);
 395         /* disable mouse, show cursor */
 396         printf ("\033[?9l\033[?25h");
 397         /* reset charset, if necessary */
 398         if (op.scheme && op.scheme->reset_seq) print (op.scheme->reset_seq);
 399         /* revert to primary screen */
 400         if (alt_screen) printf ("\033[?47l");
 401         free_field ();
 402         restore_term_mode(saved_term_mode);
 403 }
 404
 405 /* I haven't won as long as a cell exists, that
 406     - I haven't opened, and
 407     - is not a mine */
 408 int everything_opened () {
 409         for (int row = 0; row < f.h; row++)
 410                 for (int col = 0; col < f.w; col++)
 411                         if (f.c[row][col].o == CLOSED &&
 412                                 f.c[row][col].m == NO_MINE  ) return 0;
 413         return 1;
 414 }
 415
 416 int wait_mouse_up (int l, int c) {
 417         unsigned char mouse2[3];
 418         int level = 1;
 419         int l2, c2;
 420
 421         /* show :o face */
 422         move (1, field2screen_c (f.w/2)-1); print (":o");
 423
 424         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 425                 /* show a pushed-in button if cursor is on minefield */
 426                 move (l+LINE_OFFSET, field2screen_c(c));
 427                 fputs (op.scheme->mouse_highlight, stdout);
 428         }
 429
 430         while (level > 0) {
 431                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 432                         /* ignore mouse wheel events: */
 433                         if (mouse2[0] & 0x40) continue;
 434
 435                         else if (mouse2[0]&3 == 3) level--; /* release event */
 436                         else level++; /* another button pressed */
 437                 }
 438         }
 439
 440         move (1, field2screen_c (f.w/2)-1); print (":D");
 441         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 442                 partial_show_minefield (l, c, NORMAL);
 443         }
 444         c2 = screen2field_c(mouse2[1]);
 445         l2 = screen2field_l(mouse2[2]);
 446         return ((l2 == l) && (c2 == c));
 447 }
 448
 449 int choord_square (int line, int col) {
 450         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 451                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 452                         if (f.c[l][c].f != FLAG) {
 453                                 if (uncover_square (l, c))
 454                                          return 1;
 455                         }
 456                 }
 457         }
 458
 459         return 0;
 460 }
 461
 462 int uncover_square (int l, int c) {
 463         f.c[l][c].o = OPENED;
 464         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 465         partial_show_minefield (l, c, NORMAL);
 466
 467         if (f.c[l][c].m) {
 468                 f.c[l][c].m = DEATH_MINE;
 469                 return 1;
 470         }
 471
 472         /* check for chording */
 473         if (f.c[l][c].n == 0) {
 474                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 475                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 476                                 int newl = l + choord_l;
 477                                 int newc = c + choord_c;
 478                                 if (newl >= 0 && newl < f.h &&
 479                                     newc >= 0 && newc < f.w &&
 480                                     f.c[newl][newc].o == CLOSED &&
 481                                     uncover_square (newl, newc)) {
 482                                          return 1;
 483                                 }
 484                         }
 485                 }
 486         }
 487
 488         return 0;
 489 }
 490
 491 void flag_square (int l, int c) {
 492         if (f.c[l][c].o != CLOSED) return;
 493         /* cycles through flag/quesm/noflag (uses op.mode to detect which ones
 494         are allowed) */
 495         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 496         if (f.c[l][c].f==FLAG) f.f++;
 497         else f.f--; //WARN: breaks on `-q'!
 498         partial_show_minefield (l, c, NORMAL);
 499         move (1, op.scheme->cell_width);
 500         printf ("[%03d]", f.f);
 501 }
 502
 503 void quesm_square (int l, int c) {
 504         /* toggle question mark / none. won't turn flags into question marks.
 505         unlike flag_square, this function doesn't respect `-q'. */
 506         if      (f.c[l][c].o != CLOSED) return;
 507         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 508         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 509         partial_show_minefield (l, c, NORMAL);
 510 }
 511
 512 int do_uncover (int* is_newgame) {
 513         if (*is_newgame) {
 514                 *is_newgame = 0;
 515                 fill_minefield (f.p[0], f.p[1]);
 516                 timer_setup(1);
 517         }
 518
 519         if (f.c[f.p[0]][f.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 520         if (f.c[f.p[0]][f.p[1]].o == CLOSED) {
 521                 if (uncover_square (f.p[0], f.p[1])) return GAME_LOST;
 522         } else if (get_neighbours (f.p[0], f.p[1], 1) == 0) {
 523                 if (choord_square (f.p[0], f.p[1])) return GAME_LOST;
 524         }
 525         if (everything_opened()) return GAME_WON;
 526
 527         return GAME_INPROGRESS;
 528 }
 529
 530 void fill_minefield (int l, int c) {
 531         srand (time(0));
 532         int mines_set = f.m;
 533         while (mines_set) {
 534                 int line = rand() % f.h;
 535                 int col = rand() % f.w;
 536
 537                 if (f.c[line][col].m) {
 538                 /* skip if field already has a mine */
 539                         continue;
 540                 } else if ((line == l) && (col == c)) {
 541                 /* don't put a mine on the already opened (first click) field */
 542                         continue;
 543                 } else {
 544                         mines_set--;
 545                         f.c[line][col].m = STD_MINE;
 546                 }
 547         }
 548
 549         /* precalculate neighbours */
 550         for (int l=0; l < f.h; l++)
 551                 for (int c=0; c < f.w; c++)
 552                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 553 }
 554
 555 void move (int line, int col) {
 556         printf ("\033[%d;%dH", line+1, col+1);
 557 }
 558
 559 /* absolute coordinates! */
 560 void cursor_move (int l, int c) {
 561         partial_show_minefield (f.p[0], f.p[1], NORMAL);
 562         /* update f.p */
 563         f.p[0] = CLAMP(l, 0, f.h-1);
 564         f.p[1] = CLAMP(c, 0, f.w-1);
 565         move (f.p[0]+LINE_OFFSET, field2screen_c(f.p[1]));
 566         //fputs (op.scheme->mouse_highlight, stdout);
 567
 568         if (!f.c[f.p[0]][f.p[1]].f) print("\033[7m");//invert unless ! or ?
 569         partial_show_minefield (f.p[0], f.p[1], HIGHLIGHT);
 570         print("\033[0m");//un-invert
 571 }
 572
 573 char* cell2schema (int l, int c, int mode) {
 574         struct minecell cell = f.c[l][c];
 575         /* move past invert-ctrlsequence when highlighting the cursor: */
 576         int offset = ((mode==HIGHLIGHT)*op.scheme->flag_offset);
 577
 578         if (mode == SHOWMINES) return (
 579                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged+offset:
 580                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf+offset:
 581                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 582                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 583                 cell.o == CLOSED          ? op.scheme->field_closed:
 584                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 585          else return (
 586                 cell.f == FLAG            ? op.scheme->field_flagged+offset:
 587                 cell.f == QUESM           ? op.scheme->field_question+offset:
 588                 cell.o == CLOSED          ? op.scheme->field_closed:
 589                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 590                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 591                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 592 }
 593
 594 void partial_show_minefield (int l, int c, int mode) {
 595         move (l+LINE_OFFSET, field2screen_c(c));
 596
 597         print (cell2schema(l, c, mode));
 598 }
 599
 600 void show_minefield (int mode) {
 601         int dtime;
 602
 603         move (0,0);
 604
 605         if (f.t == 0) {
 606                 dtime = 0;
 607         } else {
 608                 dtime = difftime (time(NULL), f.t);
 609         }
 610
 611         /* first line */
 612         print (op.scheme->border_top_l);
 613         printm (f.w*op.scheme->cell_width,op.scheme->border_top_m);
 614         printf ("%s\r\n", op.scheme->border_top_r);
 615         /* second line */
 616         print (op.scheme->border_status_l);
 617         printf("[%03d]", f.f);
 618         printm (f.w*op.scheme->cell_width/2-6, " ");
 619         printf ("%s", mode==SHOWMINES?":C":":D");
 620         printm (f.w*op.scheme->cell_width/2-6, " ");
 621         printf ("[%03d]", dtime);
 622         print (op.scheme->border_status_r);
 623         print ("\r\n");
 624         /* third line */
 625         print (op.scheme->border_spacer_l);
 626         printm (f.w*op.scheme->cell_width,op.scheme->border_spacer_m);
 627         print (op.scheme->border_spacer_r);
 628         print ("\r\n");
 629         /* main body */
 630         for (int l = 0; l < f.h; l++) {
 631                 print (op.scheme->border_field_l);
 632                 for (int c = 0; c < f.w; c++) {
 633                         print (cell2schema(l, c, mode));
 634                 }
 635                 print (op.scheme->border_field_r); print ("\r\n");
 636         }
 637         /* last line */
 638         print (op.scheme->border_bottom_l);
 639         printm (f.w*op.scheme->cell_width,op.scheme->border_bottom_m);
 640         print (op.scheme->border_bottom_r);
 641         print ("\r\n");
 642 }
 643
 644 int get_neighbours (int line, int col, int reduced_mode) {
 645         /* counts mines surrounding a square
 646            modes: 0=normal; 1=reduced */
 647
 648         int count = 0;
 649
 650         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 651                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 652                         if (!l && !c) continue;
 653
 654                         count += !!f.c[l][c].m;
 655                         count -= reduced_mode * f.c[l][c].f==FLAG;
 656                 }
 657         }
 658         return count;
 659 }
 660
 661 struct minecell** alloc_array (int lines, int cols) {
 662         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 663         if (a == NULL) return NULL;
 664         for (int l = 0; l < lines; l++) {
 665                 a[l] = calloc (cols, sizeof(struct minecell));
 666                 if (a[l] == NULL) goto unalloc;
 667         }
 668
 669         return a;
 670 unalloc:
 671         for (int l = 0; l < lines; l++)
 672                 free (a[l]);
 673         return NULL;
 674 }
 675
 676 void free_field () {
 677         if (f.c == NULL) return;
 678         for (int l = 0; l < f.h; l++) {
 679                 free (f.c[l]);
 680         }
 681         free (f.c);
 682 }
 683
 684 int screen2field_l (int l) {
 685         return (l-LINE_OFFSET) - 1;
 686 }
 687 /* some trickery is required to extract the mouse position from the cell width,
 688 depending on wheather we are using full width characters or double line width.
 689 WARN: tested only with scheme.cell_width = 1 and scheme.cell_width = 2. */
 690 int screen2field_c (int c) {
 691         return (c-COL_OFFSET+1 - 2*(op.scheme->cell_width%2))/2 - op.scheme->cell_width/2;
 692 }
 693 int field2screen_l (int l) {
 694         return 0; //TODO: is never used, therefore not implemented
 695 }
 696 int field2screen_c (int c) {
 697         return (op.scheme->cell_width*c+COL_OFFSET - (op.scheme->cell_width%2));
 698 }
 699
 700 enum esc_states {
 701         START,
 702         ESC_SENT,
 703         CSI_SENT,
 704         MOUSE_EVENT,
 705 };
 706 int getctrlseq (unsigned char* buf) {
 707         int c;
 708         int state = START;
 709         int offset = 0x20; /* never sends control chars as data */
 710         while ((c = getchar()) != EOF) {
 711                 switch (state) {
 712                 case START:
 713                         switch (c) {
 714                         case '\033': state=ESC_SENT; break;
 715                         default: return c;
 716                         }
 717                         break;
 718                 case ESC_SENT:
 719                         switch (c) {
 720                         case '[': state=CSI_SENT; break;
 721                         default: return CTRSEQ_INVALID;
 722                         }
 723                         break;
 724                 case CSI_SENT:
 725                         switch (c) {
 726                         case 'M': state=MOUSE_EVENT; break;
 727                         default: return CTRSEQ_INVALID;
 728                         }
 729                         break;
 730                 case MOUSE_EVENT:
 731                         buf[0] = c - offset;
 732                         buf[1] = getchar() - offset;
 733                         buf[2] = getchar() - offset;
 734                         return CTRSEQ_MOUSE;
 735                 default:
 736                         return CTRSEQ_INVALID;
 737                 }
 738         }
 739         return 2;
 740 }
 741
 742 int getch(unsigned char* buf) {
 743 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 744 compatible with the ncurses implementation of same name */
 745         int action = getctrlseq(buf);
 746         int l, c;
 747         switch (action) {
 748         case CTRSEQ_MOUSE:
 749                 l = screen2field_l (buf[2]);
 750                 c = screen2field_c (buf[1]);
 751
 752                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 753                 int success = wait_mouse_up(l, c);
 754
 755                 /* mouse moved while pressed: */
 756                 if (!success) return CTRSEQ_INVALID;
 757
 758                 switch (buf[0]) {
 759                 case 0: return CTRSEQ_MOUSE_LEFT;
 760                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 761                 case 2: return CTRSEQ_MOUSE_RIGHT;
 762                 }
 763         }
 764
 765         return action;
 766 }
 767
 768 void timer_setup (int enable) {
 769         static struct itimerval tbuf;
 770         tbuf.it_interval.tv_sec  = 1;
 771         tbuf.it_interval.tv_usec = 0;
 772
 773         if (enable) {
 774                 f.t = time(NULL);
 775                 tbuf.it_value.tv_sec  = 1;
 776                 tbuf.it_value.tv_usec = 0;
 777                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 778                         perror("setitimer");
 779                         exit(1);
 780                 }
 781         } else {
 782                 tbuf.it_value.tv_sec  = 0;
 783                 tbuf.it_value.tv_usec = 0;
 784                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 785                         perror("setitimer");
 786                         exit(1);
 787                 }
 788         }
 789
 790 }