mines.c

   1 /*******************************************************************************
   2  minesviiper 0.5
   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              - o/space to open and choord
  12              - i to flag/unflag
  13              - (see `./minesviiper -h' for all keybindings)
  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 <poll.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/ioctl.h>
  27 #include <sys/time.h>
  28 #include <termios.h>
  29 #include <time.h>
  30 #include <unistd.h>
  31
  32 #include "mines.h"
  33 #include "schemes.h"
  34
  35 #define LINE_OFFSET 3
  36 #define LINES_AFTER 2
  37 #define COL_OFFSET 2
  38 #define BIG_MOVE 5
  39 #define MOUSE_MAX 231
  40 #define STOMP_TIMEOUT 150 /*ms*/
  41
  42 #define MIN(a,b) (a>b?b:a)
  43 #define MAX(a,b) (a>b?a:b)
  44 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
  45 #define printm(n, s) for (int _loop = 0; _loop < n; _loop++) fputs (s, stdout)
  46 #define print(str) fputs (str?str:"", stdout)
  47 #define EMOT(e) op.scheme->emoticons[EMOT_ ## e]
  48 #define BORDER(l, c) op.scheme->border[B_ ## l][B_ ## c]
  49 #define CW op.scheme->cell_width /* for brevity */
  50 #define DW op.scheme->display_width /* ditto. */
  51 #define HI_CELL f.c[g.p[0]][g.p[1]]
  52 #define LINE_BELOW LINE_OFFSET+f.h-1+LINES_AFTER
  53 #define CTRL_ 0x1F &
  54
  55 #define AR_CELL f.c[ROW][COL] /* helper for AROUND() */
  56 #define AROUND(l, c) /* gives us loop-variables ROW, COL, AR_CELL */ \
  57         for (int ROW = MAX(l-1, 0); ROW <= MIN(l+1, f.h-1); ROW++) \
  58                 for (int COL = MAX(c-1, 0); COL <= MIN(c+1, f.w-1); COL++) \
  59                         if (!(ROW == l && COL == c)) /* skip itself */
  60
  61 #define PAUSE_TIMER \
  62         for (int _break=(timer_setup(0),1); _break; _break=0, timer_setup(g.t))
  63
  64 struct minefield f;
  65 struct game g;
  66 struct opt op;
  67
  68 int main (int argc, char** argv) {
  69         /* defaults: */
  70         f.w = 30;
  71         f.h = 16;
  72         f.m = 99;
  73         op.scheme = &symbols_mono;
  74         op.mode = FLAG;
  75
  76         int optget;
  77         opterr = 0; /* don't print message on unrecognized option */
  78         while ((optget = getopt (argc, argv, "+hnfqbcd")) != -1) {
  79                 switch (optget) {
  80                 case 'n': op.mode    = NOFLAG; break;
  81                 case 'f': op.mode    = FLAG; break; /*default*/
  82                 case 'q': op.mode    = QUESM; break; /*WARN:implicitly sets -f*/
  83                 case 'b': op.scheme  = &symbols_mono; break;
  84                 case 'c': op.scheme  = &symbols_col1; break;
  85                 case 'd': op.scheme  = &symbols_doublewidth; break;
  86                 case 'h':
  87                 default:
  88                         fprintf (stderr, SHORTHELP LONGHELP KEYHELP, argv[0]);
  89                         return !(optget=='h');
  90                 }
  91         } if (optind < argc) { /* parse Fieldspec */
  92                 if (parse_fieldspec (argv[optind])) {
  93                         fprintf (stderr, SHORTHELP FIELDHELP, argv[0]);
  94                         return 1;
  95                 }
  96         }
  97
  98         signal_setup();
  99         atexit (*quit);
 100
 101 newgame:
 102         screen_setup(1);
 103         switch (g.o = minesviiper()) {
 104         case GAME_NEW: goto newgame;
 105         case GAME_WON: goto game_end;
 106         case GAME_LOST:goto game_end;
 107         case GAME_QUIT:goto quit;
 108         }
 109
 110 game_end:
 111         timer_setup(0); /* stop timer */
 112         int show_how = g.o==GAME_WON?SHOWFLAGS:SHOWMINES;
 113         show_minefield (show_how);
 114         for(;;) {
 115                 switch(getch_wrapper()) {
 116                 case WRAPPER_EMOTICON:
 117                 case 'r': goto newgame;
 118                 case 'q': goto quit;
 119                 case CTRL_'L':
 120                         /*WARN: updates the timer (would require fix in struct*/
 121                         screen_setup(1);
 122                         show_minefield (show_how);
 123                         break;
 124                 case CTRL_'R':
 125                         interactive_resize();
 126                         goto newgame;
 127                 }
 128         }
 129
 130 quit:
 131         return 0;
 132 }
 133
 134 int minesviiper(void) {
 135         f.c = alloc_array (f.h, f.w);
 136         g = (const struct game){0}; /* reset all game-specific parameters */
 137
 138         show_minefield (NORMAL);
 139
 140         for(;;) {
 141                 int actor = KEYBOARD; /* WARN: feels like a hack :| */
 142                 switch (getch_wrapper()) {
 143                 case ' ':
 144                         if (HI_CELL.o == OPENED) goto open_cell;
 145                         if (g.s == MODE_OPEN)  goto open_cell;
 146                         if (g.s == MODE_FLAG)  goto flag_cell;
 147                         if (g.s == MODE_QUESM) goto quesm_cell;
 148                         break;
 149                 case 's':
 150                         g.s = (g.s+1)%(op.mode+1);
 151                         show_minefield (g.c?SHOWMINES:NORMAL);
 152                         break;
 153                 case CTRSEQ_MOUSE_LEFT:
 154                         actor = MOUSE;
 155                         /* fallthrough */
 156                 open_cell:
 157                 case 'o':
 158                         switch (do_uncover(&(g.n), actor)) {
 159                                 case GAME_LOST: return GAME_LOST;
 160                                 case GAME_WON:  return GAME_WON;
 161                         }
 162                         break;
 163                 flag_cell:
 164                 case CTRSEQ_MOUSE_RIGHT:
 165                 case 'i': flag_square (g.p[0], g.p[1]); break;
 166                 quesm_cell:
 167                 case '?':quesm_square (g.p[0], g.p[1]); break;
 168                 case CTRSEQ_CURSOR_LEFT:
 169                 case 'h': move_hi (g.p[0],   g.p[1]-1); break;
 170                 case CTRSEQ_CURSOR_DOWN:
 171                 case 'j': move_hi (g.p[0]+1, g.p[1]  ); break;
 172                 case CTRSEQ_CURSOR_UP:
 173                 case 'k': move_hi (g.p[0]-1, g.p[1]  ); break;
 174                 case CTRSEQ_CURSOR_RIGHT:
 175                 case 'l': move_hi (g.p[0],   g.p[1]+1); break;
 176                 case 'w': to_next_boundary (g.p[0], g.p[1], '>', 1); break;
 177                 case 'b': to_next_boundary (g.p[0], g.p[1], '<', 1); break;
 178                 case 'u': to_next_boundary (g.p[0], g.p[1], '^', 1); break;
 179                 case 'd': to_next_boundary (g.p[0], g.p[1], 'v', 1); break;
 180                 case 'e': to_next_boundary (g.p[0], g.p[1], '>', 0); break;
 181                 case '0': /* fallthrough */
 182                 case '^': move_hi (g.p[0], 0     ); break;
 183                 case '$': move_hi (g.p[0], f.w-1 ); break;
 184                 case 'g': move_hi (0,      g.p[1]); break;
 185                 case 'G': move_hi (f.h-1,  g.p[1]); break;
 186                 case 'z': move_hi (f.h/2,  f.w/2 ); break;
 187                 case 'm': set_mark(); break;
 188                 case'\'': /* fallthrough */
 189                 case '`': jump_mark(); break;
 190                 case 'f': find(getch_wrapper(), '>', 0); break;
 191                 case 'F': find(getch_wrapper(), '<', 0); break;
 192                 case 't': find(getch_wrapper(), '>',-1); break;
 193                 case 'T': find(getch_wrapper(), '<',-1); break;
 194                 case 'a': find(getch_wrapper(), '>',+1); break;
 195                 case 'A': find(getch_wrapper(), '<',+1); break;
 196                 //TODO: HJKL, ^H^J^K^L: <spacemode> up/down/left/right/45deg
 197                 case '!': grand_opening(&(g.n)); break;
 198                 case WRAPPER_EMOTICON:
 199                 case 'r': timer_setup(0); return GAME_NEW;
 200                 case ':':
 201                         switch (ex_cmd()) {
 202                         case EX_QUIT: return GAME_QUIT;
 203                         case EX_HELP: printf (KEYHELP); break; //TODO: charset problems with vt220
 204                         case EX_RESZ:
 205                                 timer_setup(0);
 206                                 interactive_resize();
 207                                 return GAME_NEW;
 208                         default:
 209                                 printf ("\rinvalid command");
 210                                 PAUSE_TIMER ungetc(getchar(), stdin);
 211                                 printf("\033[2K"); /* clear line */
 212                         }
 213                         break;
 214                 case 'q': //TODO: redefine `q' as macro functionality
 215                         break;
 216                 case CTRL_'L':
 217                         screen_setup(1);
 218                         show_minefield (NORMAL);
 219                         break;
 220                 case '\\':
 221                         if (g.n == GAME_NEW) break; /* must open a cell first */
 222                         g.c = !g.c;
 223                         show_minefield (g.c?SHOWMINES:NORMAL);
 224                         break;
 225                 }
 226         }
 227
 228 }
 229
 230 void quit (void) {
 231         screen_setup(0);
 232         free_field ();
 233 }
 234
 235 /* I haven't won as long as a cell exists, that
 236     - I haven't opened, and
 237     - is not a mine */
 238 int everything_opened (void) {
 239         for (int row = 0; row < f.h; row++)
 240                 for (int col = 0; col < f.w; col++)
 241                         if (f.c[row][col].o == CLOSED &&
 242                             f.c[row][col].m == NO_MINE  ) return 0;
 243         return 1;
 244 }
 245
 246 int wait_mouse_up (int l, int c) {
 247         unsigned char mouse2[3];
 248         int level = 1;
 249         int l2, c2;
 250
 251         /* show :o face */
 252         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 253
 254         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 255                 /* show a pushed-in button if cursor is on minefield */
 256                 redraw_cell (l, c, HIGHLIGHT);
 257
 258                 show_stomp(1, l, c);
 259         }
 260
 261         while (level > 0) {
 262                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 263                         /* ignore mouse wheel events: */
 264                         if (mouse2[0] & 0x40) continue;
 265
 266                         else if((mouse2[0]&3) == 3) level--; /* release event */
 267                         else level++; /* another button pressed */
 268                 }
 269         }
 270
 271         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 272
 273         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 274                 redraw_cell (l, c, g.o?SHOWMINES:NORMAL);
 275                 show_stomp(0, l, c);
 276         }
 277         c2 = screen2field_c(mouse2[1]);
 278         l2 = screen2field_l(mouse2[2]);
 279         return ((l2 == l) && (c2 == c));
 280 }
 281
 282 int choord_square (int line, int col) {
 283         AROUND(line,col)
 284                 if (AR_CELL.f != FLAG) {
 285                         if (uncover_square (ROW, COL))
 286                                  return 1;
 287                 }
 288
 289         return 0;
 290 }
 291
 292 int uncover_square (int l, int c) {
 293         if (f.c[l][c].o == OPENED)
 294                 return 0; /* nothing to do */
 295
 296         f.c[l][c].o = OPENED;
 297         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 298         redraw_cell (l, c, NORMAL);
 299
 300         if (f.c[l][c].m) {
 301                 f.c[l][c].m = DEATH_MINE;
 302                 return 1;
 303         }
 304
 305         /* check for chording */
 306         if (f.c[l][c].n == 0) {
 307                 AROUND(l, c)
 308                         if (uncover_square (ROW, COL)) return 1;
 309         }
 310
 311         return 0;
 312 }
 313
 314 void flag_square (int l, int c) {
 315         static char modechar[] = {'*', '!', '?'};
 316
 317         if (f.c[l][c].o != CLOSED) return;
 318         /* cycle through flag/quesm/noflag: */
 319         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 320         if (f.c[l][c].f==FLAG) g.f++;
 321         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 322                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 323         redraw_cell (l, c, NORMAL);
 324         move_ph (1, op.scheme->cell_width);
 325         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 326 }
 327
 328 void quesm_square (int l, int c) {
 329         /* toggle question mark / none. won't turn flags into question marks.
 330         unlike flag_square, this function doesn't respect `-q'. */
 331         if      (f.c[l][c].o != CLOSED) return;
 332         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 333         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 334         redraw_cell (l, c, NORMAL);
 335 }
 336
 337 int do_uncover (int* is_newgame, int actor) {
 338         if (*is_newgame == GAME_NEW) {
 339                 *is_newgame = GAME_INPROGRESS;
 340                 fill_minefield (g.p[0], g.p[1]);
 341                 timer_setup(1);
 342         }
 343
 344 #ifdef COORD_ON_FLAG
 345         if (HI_CELL.f == FLAG  ) {
 346                 if (choord_square(g.p[0], g.p[1])) return GAME_LOST;
 347                 else return GAME_INPROGRESS;
 348         }
 349 #else
 350         if (HI_CELL.f == FLAG  ) return GAME_INPROGRESS;
 351 #endif
 352         if (HI_CELL.o == CLOSED) {
 353                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 354         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 355                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 356         } else if (actor != MOUSE) {
 357                 show_stomp(1, g.p[0], g.p[1]);
 358
 359                 wait_stomp();
 360
 361                 show_stomp(0, g.p[0], g.p[1]);
 362         }
 363         if (everything_opened()) return GAME_WON;
 364
 365         return GAME_INPROGRESS;
 366 }
 367
 368 #define for_each_cell(r, c) \
 369         for (int r = 0; r < f.h; r++) for (int c = 0; c < f.w; c++)
 370 int grand_opening(int* is_newgame) {
 371         /* Find the largest cluster of zero-cells and open it. This is a bad
 372         implementation of a connected-component labelling algorithm and also
 373         uses (gasp!) VLAs! */
 374
 375         if (*is_newgame == GAME_NEW) {
 376                 *is_newgame = GAME_INPROGRESS;
 377                 fill_minefield (-1, -1);
 378                 timer_setup(1);
 379         } else return GAME_INPROGRESS; /* only allow this as the first move */
 380
 381         int clusters[f.h*f.w]; /* each 0-cell gets labelled with a cluster */
 382         int cluster_id = 1;    /* number. connected cells get the same.    */
 383         int largest = 1;       /* the largest cluster will then be opened. */
 384         memset(clusters, 0, f.h*f.w * sizeof(int));
 385
 386         /* assign cluster numbers: */
 387         for_each_cell(r, c) {
 388                 if (assign_cluster(r, c, cluster_id, clusters))
 389                         cluster_id++;
 390         }
 391
 392         /* calculate cluster sizes: */
 393         int id_size[cluster_id];
 394         memset(id_size, 0, cluster_id * sizeof(int));
 395         for_each_cell(r, c)
 396                 id_size[ clusters[r*f.w+c] ]++;
 397
 398         /* find largest cluster and open it: */
 399         for (int i = 1; i < cluster_id; i++)
 400                 if (id_size[i] > id_size[largest])
 401                         largest = i;
 402         for_each_cell(r, c) {
 403                 if (clusters[r*f.w+c] == largest) {
 404                         g.p[0] = r;
 405                         g.p[1] = c;
 406                         return do_uncover(is_newgame, KEYBOARD);
 407                 }
 408         }
 409
 410         return GAME_INPROGRESS; /* that shouln't ever happen(TM) */
 411 }
 412 #undef for_each_cell
 413 int assign_cluster(int r, int c, int id, int *clusters) {
 414         int tagged = 0;
 415
 416         if (clusters[r*f.w+c] > 0    /* already tagged    */
 417         ||  f.c[r][c].n       > 0   /* cell not empty    */
 418         ||  f.c[r][c].m            /* cell has mine     */
 419         ||  f.c[r][c].o         ) /* cell already open */
 420                 return tagged;
 421
 422         /* else, tag the cell and its neighbours */
 423
 424         clusters[r*f.w+c] = id; tagged++;
 425         AROUND(r, c)
 426                 tagged+= assign_cluster(ROW, COL, id, clusters);
 427
 428         return tagged;
 429 }
 430
 431 int ex_cmd(void) {
 432         char what[256];
 433         printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 434         PAUSE_TIMER { /* timer spams ASCII STX (0x02) chars */
 435                 move_ph(LINE_BELOW, 0);
 436                 putchar(':'); /* prompt */
 437
 438                 raw_mode(0);/*use cooked mode, so we get line editing for free*/
 439                 fgets(what, 256, stdin); //TODO: cancel on ^G, ESC, ^C, ...
 440                 raw_mode(1);
 441
 442                 move_ph(LINE_BELOW, 0);
 443                 printf ("\033[0J"); /* clear to the end of the screen */
 444         }
 445         printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 446
 447         switch (what[0]) { //TODO: urgh.
 448         case 'q': return EX_QUIT;
 449         case 'h': return EX_HELP;
 450         case 'r': return EX_RESZ;
 451         default:  return EX_INVALID;
 452         }
 453 }
 454 void set_mark(void) {
 455         int mark = tolower(getch_wrapper());
 456         if (mark < 'a' || mark > 'z') return; /*out of bound*/
 457
 458         g.m[mark-'a'].l = g.p[0];
 459         g.m[mark-'a'].c = g.p[1];
 460         g.m[mark-'a'].s = 1;
 461 }
 462
 463 void jump_mark(void) {
 464         int mark = tolower(getch_wrapper());
 465         /* check bounds and if set: */
 466         if (mark < 'a' || mark > 'z' || !g.m[mark-'a'].s) return;
 467         move_hi (g.m[mark-'a'].l, g.m[mark-'a'].c);
 468 }
 469
 470 void fill_minefield (int l, int c) {
 471         srand (time(0));
 472         int mines_set = f.m;
 473         while (mines_set) {
 474                 int line = rand() % f.h;
 475                 int col = rand() % f.w;
 476
 477                 if (f.c[line][col].m) {
 478                 /* skip if field already has a mine */
 479                         continue;
 480                 } else if ((line == l) && (col == c)) {
 481                 /* don't put a mine on the already opened (first click) field */
 482                         continue;
 483                 } else {
 484                         mines_set--;
 485                         f.c[line][col].m = STD_MINE;
 486                 }
 487         }
 488
 489         /* precalculate neighbours */
 490         for (int l=0; l < f.h; l++)
 491                 for (int c=0; c < f.w; c++)
 492                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 493 }
 494
 495 void move_ph (int line, int col) {
 496         /* move printhead to zero-indexed position */
 497         printf ("\033[%d;%dH", line+1, col+1);
 498 }
 499
 500 void move_hi (int l, int c) {
 501         /* move cursor and highlight to absolute coordinates */
 502
 503         redraw_cell (g.p[0], g.p[1], NORMAL);
 504         /* update g.p */
 505         g.p[0] = CLAMP(l, 0, f.h-1);
 506         g.p[1] = CLAMP(c, 0, f.w-1);
 507         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 508
 509         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 510 }
 511
 512 /* to_next_boundary(): move into the supplied direction until a change in open-
 513 state or flag-state is found and move there. falls back to BIG_MOVE. */
 514 #define FIND_BOUND(X, L, C, L1, C1, MAX, OP) do {\
 515         new_ ## X OP ## = BIG_MOVE;\
 516         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 517                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 518                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 519                         new_ ## X = i OP advance;\
 520                         break;\
 521                 }\
 522         } while(0)
 523 void to_next_boundary (int l, int c, char direction, int advance) {
 524         int new_l = l;
 525         int new_c = c;
 526         switch (direction) {
 527         case '>': FIND_BOUND(c, l, i, l, i+1, w, +); break;
 528         case '<': FIND_BOUND(c, l, i, l, i-1, w, -); break;
 529         case '^': FIND_BOUND(l, i, c, i-1, c, h, -); break;
 530         case 'v': FIND_BOUND(l, i, c, i+1, c, h, +); break;
 531         }
 532
 533         move_hi (new_l, new_c);
 534 }
 535 #undef FIND_BOUND
 536
 537 #define CELL f.c[g.p[0]][c]
 538 #define FIND_NEXT(CONDITION, DIRECTION) do {\
 539         int plusminus = DIRECTION-'='; /* -1 if '<', 1 if '>' */ \
 540         for (int c = g.p[1]+plusminus; c >= 0 && c < f.w; c+=plusminus) \
 541                 if (CONDITION) { \
 542                         move_hi (g.p[0], c+(till_after*plusminus)); \
 543                         return 1; /* NOTE: break didn't work */ \
 544                 } \
 545                 return 0; \
 546         } while(0)
 547 int find (int what, char direction, int till_after) {
 548         switch (what) {
 549         case ' ': what = '0'; /* fallthrough */
 550         case '0': case '1': case '2':
 551         case '3': case '4': case '5':
 552         case '6': case '7': case '8': /* numbers, opened */
 553                             FIND_NEXT(CELL.o && CELL.n == what-'0', direction);
 554         case 'o':           FIND_NEXT(CELL.o, direction);       /* any opened */
 555         case 'c':           FIND_NEXT(!CELL.o, direction);      /* any closed */
 556         case 'f': case 'i': FIND_NEXT(CELL.f==FLAG, direction); /* is flagged */
 557         case 'q': case '?': FIND_NEXT(CELL.f==QUESM, direction);/* questioned */
 558         }
 559
 560         return 0;
 561 }
 562 #undef FIND_NEXT
 563 #undef CELL
 564
 565 char* cell2schema (int l, int c, int mode) {
 566         struct minecell cell = f.c[l][c];
 567
 568         if (mode == SHOWMINES) return (
 569                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 570                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 571                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 572                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 573                 cell.o == CLOSED          ? op.scheme->field_closed:
 574                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 575         else if (mode == SHOWFLAGS) return (
 576                 /* on win (everything opened, only correct flags left) */
 577                 cell.m == STD_MINE        ? op.scheme->field_flagged:
 578                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 579         else return (
 580                 cell.f == FLAG            ? op.scheme->field_flagged:
 581                 cell.f == QUESM           ? op.scheme->field_question:
 582                 cell.o == CLOSED          ? op.scheme->field_closed:
 583                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 584                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 585                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 586 }
 587
 588 void redraw_cell (int l, int c, int mode) {
 589         move_ph (l+LINE_OFFSET, field2screen_c(c));
 590         if (mode == HIGHLIGHT) printf ("\033[7m"); /* reverse video */
 591         print (cell2schema(l, c, mode));
 592         if (mode == HIGHLIGHT) printf ("\033[0m"); /* reset all */
 593 }
 594
 595 char* get_emoticon(void) {
 596         return g.o==GAME_WON ? EMOT(WON):
 597                g.o==GAME_LOST? EMOT(DEAD):
 598                 EMOT(SMILE);
 599 }
 600
 601 /* https://zserge.com/blog/c-for-loop-tricks.html */
 602 #define print_line(which) \
 603         for (int _break = (printf("%s", BORDER(which,LEFT)), 1); _break; \
 604                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 605 #define print_border(which, width) \
 606         print_line(which) printm (width, BORDER(which,MIDDLE))
 607 void show_minefield (int mode) {
 608         int dtime = difftime (time(NULL), g.t)*!!g.t;
 609         int half_spaces = f.w*op.scheme->cell_width/2;
 610         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 611         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 612         static char modechar[] = {'*', '!', '?'};
 613
 614         move_ph (0,0);
 615
 616         print_border(TOP, f.w);
 617         print_line(STATUS) {
 618                 printf("[%03d%c]%*s%s%*s[%03d]",
 619                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 620                   left_spaces,"", get_emoticon(), right_spaces,"",
 621                   /* [ */ dtime /* ] */);
 622         }
 623         print_border(DIVIDER, f.w);
 624         /* main body */
 625         for (int l = 0; l < f.h; l++) print_line(FIELD)
 626                 printm (f.w, cell2schema(l, _loop, mode));
 627         print_border(BOTTOM, f.w);
 628 }
 629
 630 void show_stomp (int enable, int l, int c) {
 631         if (enable) {
 632                 if (f.c[l][c].o == OPENED && get_neighbours (l, c, 1) != 0) {
 633                         /* show the stomp radius if we aren't fully flagged */
 634                         AROUND(l, c)
 635                                 if (AR_CELL.o == CLOSED && AR_CELL.f != FLAG)
 636                                         redraw_cell (ROW, COL, HIGHLIGHT);
 637                         fflush(stdout); /* won't display without */
 638                 }
 639         } else {
 640                 AROUND(l, c) redraw_cell (ROW, COL, g.o?SHOWMINES:NORMAL);
 641         }
 642 }
 643
 644 void wait_stomp (void) {
 645         /* block SIGALRM, otherwise poll gets cancelled by the timer: */
 646         sigset_t sig;
 647         sigemptyset (&sig);
 648         sigaddset(&sig, SIGALRM);
 649         sigprocmask (SIG_BLOCK, &sig, NULL);
 650
 651         /* wait for timout or keypress: */
 652         struct pollfd fds;
 653         fds.fd = 0; fds.events = POLLIN;
 654         poll(&fds, 1, STOMP_TIMEOUT);
 655
 656         /* restore signal mask: */
 657         sigprocmask (SIG_UNBLOCK, &sig, NULL);
 658 }
 659
 660 int get_neighbours (int line, int col, int reduced_mode) {
 661         /* counts mines surrounding a square
 662            modes: 0=normal; 1=reduced */
 663
 664         int count = 0;
 665         AROUND(line, col) {
 666                 count += !!AR_CELL.m;
 667                 count -= reduced_mode * AR_CELL.f==FLAG;
 668         }
 669         return count;
 670 }
 671
 672 void interactive_resize(void) {
 673         unsigned char buf[3];
 674         int old_w = f.w;
 675         int old_h = f.h;
 676         for(;;) {
 677                 screen_setup(1); /* clears the screen */
 678                 show_minefield (RESIZEMODE);
 679                 /* show the new field size in the corner: */
 680                 move_ph(f.h+LINE_OFFSET-1,COL_OFFSET);
 681                 printf("%d x %d", f.w, f.h);
 682                 move_ph(LINE_BELOW, 0);
 683                 printf("Resize Mode: Enter to set, Q to abort");
 684                 //TODO: need escape seq. to print lowercase in `-d' mode!
 685
 686                 free_field(); /* must free before resizing! */
 687                 switch (getctrlseq(buf)) {
 688                 case CTRSEQ_CURSOR_LEFT: case 'h': f.w--; break;
 689                 case CTRSEQ_CURSOR_DOWN: case 'j': f.h++; break;
 690                 case CTRSEQ_CURSOR_UP:   case 'k': f.h--; break;
 691                 case CTRSEQ_CURSOR_RIGHT:case 'l': f.w++; break;
 692                 case 'w': f.w+=BIG_MOVE; break;
 693                 case 'b': f.w-=BIG_MOVE; break;
 694                 case 'u': f.h-=BIG_MOVE; break;
 695                 case 'd': f.h+=BIG_MOVE; break;
 696                 case 0xa: return; /* enter */
 697                 case 'q': /* abort */
 698                         f.w = old_w;
 699                         f.h = old_h;
 700                         screen_setup(1);
 701                         return;
 702                 }
 703
 704                 clamp_fieldsize();
 705                 f.m = mines_percentage(f.w, f.h);
 706                 f.c = alloc_array (f.h, f.w);
 707         }
 708 }
 709
 710 struct minecell** alloc_array (int lines, int cols) {
 711         free_field (); /* NOTE: this feels like a hack :| */
 712         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 713         if (a == NULL) return NULL;
 714         for (int l = 0; l < lines; l++) {
 715                 a[l] = calloc (cols, sizeof(struct minecell));
 716                 if (a[l] == NULL) goto unalloc;
 717         }
 718
 719         return a;
 720 unalloc:
 721         for (int l = 0; l < lines; l++)
 722                 free (a[l]);
 723         return NULL;
 724 }
 725
 726 void free_field (void) {
 727         if (f.c == NULL) return;
 728         for (int l = 0; l < f.h; l++) {
 729                 free (f.c[l]);
 730         }
 731
 732         free (f.c);
 733         f.c = NULL;
 734 }
 735
 736 int screen2field_l (int l) {
 737         return (l-LINE_OFFSET) - 1;
 738 }
 739 int screen2field_c (int c) {
 740         /* this depends on the cell width and only works when it is 1 or 2. */
 741         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 742 }
 743 int field2screen_c (int c) {
 744         return (CW*c+COL_OFFSET - (CW%2));
 745 }
 746 int clicked_emoticon (unsigned char* mouse) {
 747         return (mouse[2] == LINE_OFFSET-1 && (
 748                 mouse[1] == f.w+COL_OFFSET ||
 749                 mouse[1] == f.w+COL_OFFSET+1));
 750 }
 751
 752 enum esc_states {
 753         START,
 754         ESC_SENT,
 755         CSI_SENT,
 756         MOUSE_EVENT,
 757 };
 758 int getctrlseq (unsigned char* buf) {
 759         int c;
 760         int state = START;
 761         int offset = 0x20; /* never sends control chars as data */
 762         while ((c = getchar()) != EOF) {
 763                 switch (state) {
 764                 case START:
 765                         switch (c) {
 766                         case '\033': state=ESC_SENT; break;
 767                         default: return c;
 768                         }
 769                         break;
 770                 case ESC_SENT:
 771                         switch (c) {
 772                         case '[': state=CSI_SENT; break;
 773                         default: return CTRSEQ_INVALID;
 774                         }
 775                         break;
 776                 case CSI_SENT:
 777                         switch (c) {
 778                         case 'A': return CTRSEQ_CURSOR_UP;
 779                         case 'B': return CTRSEQ_CURSOR_DOWN;
 780                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 781                         case 'D': return CTRSEQ_CURSOR_LEFT;
 782                         case 'M': state=MOUSE_EVENT; break;
 783                         default: return CTRSEQ_INVALID;
 784                         }
 785                         break;
 786                 case MOUSE_EVENT:
 787                         buf[0] = c - offset;
 788                         buf[1] = getchar() - offset;
 789                         buf[2] = getchar() - offset;
 790                         return CTRSEQ_MOUSE;
 791                 default:
 792                         return CTRSEQ_INVALID;
 793                 }
 794         }
 795         return 2;
 796 }
 797
 798 int getch(unsigned char* buf) {
 799 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 800 compatible with the ncurses implementation of same name */
 801         int action = getctrlseq(buf);
 802         int l, c;
 803         switch (action) {
 804         case CTRSEQ_MOUSE:
 805                 l = screen2field_l (buf[2]);
 806                 c = screen2field_c (buf[1]);
 807
 808                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 809                 int success = wait_mouse_up(l, c);
 810
 811                 /* mouse moved while pressed: */
 812                 if (!success) return CTRSEQ_INVALID;
 813
 814                 switch (buf[0]) {
 815                 case 0: return CTRSEQ_MOUSE_LEFT;
 816                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 817                 case 2: return CTRSEQ_MOUSE_RIGHT;
 818                 }
 819         }
 820
 821         return action;
 822 }
 823
 824 int getch_wrapper (void) {
 825         unsigned char mouse[3];
 826         int c;
 827         /*skip over ASCII_STX=0x02 that gets sent when returning from SIGALRM:*/
 828         while ( (c = getch(mouse)) == 0x02);
 829
 830         if (c == CTRSEQ_MOUSE_LEFT || c == CTRSEQ_MOUSE_RIGHT) {
 831                 if (clicked_emoticon(mouse))
 832                         return WRAPPER_EMOTICON;
 833
 834                 if (screen2field_c (mouse[1]) < 0
 835                  || screen2field_c (mouse[1]) >= f.w
 836                  || screen2field_l (mouse[2]) < 0
 837                  || screen2field_l (mouse[2]) >= f.h)
 838                         return CTRSEQ_INVALID;
 839
 840                 g.p[0] = screen2field_l (mouse[2]);
 841                 g.p[1] = screen2field_c (mouse[1]);
 842
 843                 return c; /* CTRSEQ_MOUSE_LEFT || CTRSEQ_MOUSE_RIGHT */
 844         }
 845
 846         return c;
 847 }
 848
 849 void clamp_fieldsize (void) {
 850         /* clamp field size to terminal size and mouse maximum: */
 851         struct winsize w;
 852         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 853
 854         /* seven is the minimum width of the status bar */
 855         /* NOTE: min of status in DEC mode: 13 (WONTFIX) */
 856         if (f.w < 7) f.w = 7;
 857         if (f.h < 7) f.h = 7;
 858
 859         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 860                 f.w = (w.ws_col - COL_OFFSET - COL_OFFSET)/DW;
 861         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 862                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 863         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 864                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 865         if (LINE_OFFSET + f.h > MOUSE_MAX)
 866                 f.h = MOUSE_MAX - LINE_OFFSET;
 867 }
 868
 869 int mines_percentage(int w, int h) {
 870         return w*h*(w*h<30*16?.15625:.20625);
 871 }
 872
 873 int parse_fieldspec(char* str) {
 874         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 875         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 876
 877         clamp_fieldsize();
 878
 879         if (n < 2) {
 880                 return 1; /* error */
 881         } else if (n == 2) {
 882                 f.m = mines_percentage(f.w, f.h);
 883         }
 884
 885         f.m = MIN(f.m, (f.w-1) * (f.h-1)); /* limit mines */
 886
 887         return 0;
 888 }
 889
 890 void timer_setup (int enable) {
 891         static struct itimerval tbuf;
 892         tbuf.it_interval.tv_sec  = 1;
 893         tbuf.it_interval.tv_usec = 0;
 894
 895         if (enable) {
 896                 g.t = time(NULL);
 897                 tbuf.it_value.tv_sec  = 1;
 898                 tbuf.it_value.tv_usec = 0;
 899                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 900                         perror("setitimer");
 901                         exit(1);
 902                 }
 903         } else {
 904                 tbuf.it_value.tv_sec  = 0;
 905                 tbuf.it_value.tv_usec = 0;
 906                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 907                         perror("setitimer");
 908                         exit(1);
 909                 }
 910         }
 911
 912 }
 913
 914 void signal_setup (void) {
 915         struct sigaction saction;
 916
 917         saction.sa_handler = signal_handler;
 918         sigemptyset(&saction.sa_mask);
 919         saction.sa_flags   = 0;
 920         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 921                 perror("SIGALRM");
 922                 exit(1);
 923         }
 924
 925         if (sigaction(SIGCONT, &saction, NULL) < 0 ) {
 926                 perror ("SIGCONT");
 927                 exit (1);
 928         }
 929
 930         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 931                 perror ("SIGINT");
 932                 exit (1);
 933         }
 934 }
 935
 936 void signal_handler (int signum) {
 937         int dtime;
 938         switch (signum) {
 939         case SIGALRM:
 940                 dtime = difftime (time(NULL), g.t);
 941                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 942                 printf ("[%03d]", g.t?dtime:0);
 943                 break;
 944         case SIGCONT:
 945                 /* NOTE: will leave the VT220 in special graphics charset */
 946                 screen_setup(0);
 947                 screen_setup(1);
 948                 show_minefield (g.c?SHOWMINES:NORMAL);
 949                 break;
 950         case SIGINT:
 951                 exit(128+SIGINT);
 952         }
 953 }
 954
 955 void screen_setup (int enable) {
 956         static int sent_init;
 957         if (enable) {
 958                 raw_mode(1);
 959                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 960                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 961                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 962                 if (!sent_init++) /* swich charset, if necessary and only once*/
 963                         print (op.scheme->init_seq);
 964         } else {
 965                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 966                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 967                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 968                 raw_mode(0);
 969                 sent_init = 0;
 970         }
 971 }
 972
 973 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 974 void raw_mode(int enable) {
 975         static struct termios saved_term_mode;
 976         struct termios raw_term_mode;
 977
 978         if (enable) {
 979                 if (saved_term_mode.c_lflag == 0)/*don't overwrite stored mode*/
 980                         tcgetattr(STDIN_FILENO, &saved_term_mode);
 981                 raw_term_mode = saved_term_mode;
 982                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 983                 raw_term_mode.c_cc[VMIN] = 1 ;
 984                 raw_term_mode.c_cc[VTIME] = 0;
 985                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 986         } else {
 987                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 988         }
 989 }