mines.c

   1 /*******************************************************************************
   2  minesviiper 0.4
   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 <sys/ioctl.h>
  26 #include <sys/time.h>
  27 #include <termios.h>
  28 #include <time.h>
  29 #include <unistd.h>
  30
  31 #include "mines.h"
  32 #include "schemes.h"
  33
  34 #define LINE_OFFSET 3
  35 #define LINES_AFTER 2
  36 #define COL_OFFSET 2
  37 #define BIG_MOVE 5
  38 #define MOUSE_MAX 231
  39 #define STOMP_TIMEOUT 150 /*ms*/
  40
  41 #define MIN(a,b) (a>b?b:a)
  42 #define MAX(a,b) (a>b?a:b)
  43 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
  44 #define printm(n, s) for (int _loop = 0; _loop < n; _loop++) fputs (s, stdout)
  45 #define print(str) fputs (str?str:"", stdout)
  46 #define EMOT(e) op.scheme->emoticons[EMOT_ ## e]
  47 #define BORDER(l, c) op.scheme->border[B_ ## l][B_ ## c]
  48 #define CW op.scheme->cell_width /* for brevity */
  49 #define HI_CELL f.c[g.p[0]][g.p[1]]
  50 #define CTRL_ 0x1F &
  51
  52 #define AR_CELL f.c[ROW][COL] /* helper for AROUND() */
  53 #define AROUND(l, c) /* gives us loop-variables ROW, COL, AR_CELL */ \
  54         for (int ROW = MAX(l-1, 0); ROW <= MIN(l+1, f.h-1); ROW++) \
  55                 for (int COL = MAX(c-1, 0); COL <= MIN(c+1, f.w-1); COL++) \
  56                         if (!(ROW == l && COL == c)) /* skip itself */
  57
  58 struct minefield f;
  59 struct game g;
  60 struct opt op;
  61
  62 int main (int argc, char** argv) {
  63         /* defaults: */
  64         f.w = 30;
  65         f.h = 16;
  66         f.m = 99;
  67         op.scheme = &symbols_mono;
  68         op.mode = FLAG;
  69
  70         int optget;
  71         opterr = 0; /* don't print message on unrecognized option */
  72         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
  73                 switch (optget) {
  74                 case 'n': op.mode    = NOFLAG; break;
  75                 case 'f': op.mode    = FLAG; break; /*default*/
  76                 case 'q': op.mode    = QUESM; break; /*WARN:implicitly sets -f*/
  77                 case 'c': op.scheme  = &symbols_col1; break;
  78                 case 'd': op.scheme  = &symbols_doublewidth; break;
  79                 case 'h':
  80                 default:
  81                         fprintf (stderr, SHORTHELP LONGHELP, argv[0]);
  82                         return !(optget=='h');
  83                 }
  84         } if (optind < argc) { /* parse Fieldspec */
  85                 if (parse_fieldspec (argv[optind])) {
  86                         fprintf (stderr, SHORTHELP FIELDHELP, argv[0]);
  87                         return 1;
  88                 }
  89         }
  90
  91         signal_setup();
  92         screen_setup(1);
  93         atexit (*quit);
  94
  95 newgame:
  96         switch (minesviiper()) {
  97         case GAME_NEW: goto newgame;
  98         case GAME_WON: g.o = GAME_WON; break;
  99         case GAME_LOST:g.o = GAME_LOST;break;
 100         case GAME_QUIT:goto quit;
 101         }
 102
 103         timer_setup(0); /* stop timer */
 104         show_minefield (SHOWMINES);
 105         for(;;) {
 106                 switch(getch_wrapper()) {
 107                 case WRAPPER_EMOTICON:
 108                 case 'r': goto newgame;
 109                 case 'q': goto quit;
 110                 case CTRL_'L': //TODO: updates the timer (fix in show_minefield())
 111                         screen_setup(1);
 112                         show_minefield (SHOWMINES);
 113                         break;
 114                 case CTRL_'R':
 115                         interactive_resize();
 116                         goto newgame;
 117                 }
 118         }
 119
 120 quit:
 121         return 0;
 122 }
 123
 124 int minesviiper(void) {
 125         f.c = alloc_array (f.h, f.w);
 126         g = (const struct game){0}; /* reset all game-specific parameters */
 127
 128         show_minefield (NORMAL);
 129
 130         for(;;) {
 131                 int actor = KEYBOARD; /* WARN: feels like a hack :| */
 132                 switch (getch_wrapper()) {
 133                 case ' ':
 134                         if (HI_CELL.o == OPENED) goto open_cell;
 135                         if (g.s == MODE_OPEN)  goto open_cell;
 136                         if (g.s == MODE_FLAG)  goto flag_cell;
 137                         if (g.s == MODE_QUESM) goto quesm_cell;
 138                         break;
 139                 case 'e':
 140                         g.s = (g.s+1)%(op.mode+1);
 141                         show_minefield (g.c?SHOWMINES:NORMAL);
 142                         break;
 143                 case CTRSEQ_MOUSE_LEFT:
 144                         actor = MOUSE;
 145                         /* fallthrough */
 146                 open_cell:
 147                 case 'o':
 148                         switch (do_uncover(&(g.n), actor)) {
 149                                 case GAME_LOST: return GAME_LOST;
 150                                 case GAME_WON:  return GAME_WON;
 151                         }
 152                         break;
 153                 flag_cell:
 154                 case CTRSEQ_MOUSE_RIGHT:
 155                 case 'i': flag_square (g.p[0], g.p[1]); break;
 156                 quesm_cell:
 157                 case '?':quesm_square (g.p[0], g.p[1]); break;
 158                 case CTRSEQ_CURSOR_LEFT:
 159                 case 'h': move_hi (g.p[0],   g.p[1]-1); break;
 160                 case CTRSEQ_CURSOR_DOWN:
 161                 case 'j': move_hi (g.p[0]+1, g.p[1]  ); break;
 162                 case CTRSEQ_CURSOR_UP:
 163                 case 'k': move_hi (g.p[0]-1, g.p[1]  ); break;
 164                 case CTRSEQ_CURSOR_RIGHT:
 165                 case 'l': move_hi (g.p[0],   g.p[1]+1); break;
 166                 case 'w': to_next_boundary (g.p[0], g.p[1], '>'); break;
 167                 case 'b': to_next_boundary (g.p[0], g.p[1], '<'); break;
 168                 case 'u': to_next_boundary (g.p[0], g.p[1], '^'); break;
 169                 case 'd': to_next_boundary (g.p[0], g.p[1], 'v'); break;
 170                 case '0': /* fallthrough */
 171                 case '^': move_hi (g.p[0],    0        ); break;
 172                 case '$': move_hi (g.p[0],    f.w-1    ); break;
 173                 case 'g': move_hi (0,         g.p[1]   ); break;
 174                 case 'G': move_hi (f.h-1,     g.p[1]   ); break;
 175                 case 'z': move_hi (f.h/2, f.w/2); break;
 176                 case 'm': set_mark(); break;
 177                 case'\'': /* fallthrough */
 178                 case '`': jump_mark(); break;
 179                 case 'f': find(getch_wrapper(), '>'); break;
 180                 case 'F': find(getch_wrapper(), '<'); break;
 181                 case 't': till(getch_wrapper(), '>'); break;
 182                 case 'T': till(getch_wrapper(), '<'); break;
 183                 case 'a': after(getch_wrapper(),'>'); break;
 184                 case 'A': after(getch_wrapper(),'<'); break;
 185                 case WRAPPER_EMOTICON:
 186                 case 'r': timer_setup(0); return GAME_NEW;
 187                 case 'q':
 188                         move_ph (f.h-1+LINE_OFFSET+LINES_AFTER, 0);
 189                         printf ("quit game? [Y/n]");
 190                         if (getch_wrapper() != 'n') return GAME_QUIT;
 191                         move_ph (f.h-1+LINE_OFFSET+LINES_AFTER, 0);
 192                         printf("\033[2K"); fflush(stdout); /* clear line */
 193                         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 194                         break;
 195                 case CTRL_'L':
 196                         screen_setup(1);
 197                         show_minefield (NORMAL);
 198                         break;
 199                 case CTRL_'R':
 200                         timer_setup(0);
 201                         interactive_resize();
 202                         return GAME_NEW;
 203                 case '\\':
 204                         if (g.n == GAME_NEW) break; /* must open a cell first */
 205                         g.c = !g.c;
 206                         show_minefield (g.c?SHOWMINES:NORMAL);
 207                         break;
 208                 }
 209         }
 210
 211 }
 212
 213 void quit (void) {
 214         screen_setup(0);
 215         free_field ();
 216 }
 217
 218 /* I haven't won as long as a cell exists, that
 219     - I haven't opened, and
 220     - is not a mine */
 221 int everything_opened (void) {
 222         for (int row = 0; row < f.h; row++)
 223                 for (int col = 0; col < f.w; col++)
 224                         if (f.c[row][col].o == CLOSED &&
 225                             f.c[row][col].m == NO_MINE  ) return 0;
 226         return 1;
 227 }
 228
 229 int wait_mouse_up (int l, int c) { /* TODO: should not take minefield-coords but absolute ones */
 230         unsigned char mouse2[3];
 231         int level = 1;
 232         int l2, c2;
 233
 234         /* show :o face */
 235         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 236
 237         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 238                 /* show a pushed-in button if cursor is on minefield */
 239                 redraw_cell (l, c, HIGHLIGHT);
 240
 241                 show_stomp(1, l, c);
 242         }
 243
 244         while (level > 0) {
 245                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 246                         /* ignore mouse wheel events: */
 247                         if (mouse2[0] & 0x40) continue;
 248
 249                         else if((mouse2[0]&3) == 3) level--; /* release event */
 250                         else level++; /* another button pressed */
 251                 }
 252         }
 253
 254         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 255
 256         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 257                 redraw_cell (l, c, g.o?SHOWMINES:NORMAL);
 258                 show_stomp(0, l, c);
 259         }
 260         c2 = screen2field_c(mouse2[1]);
 261         l2 = screen2field_l(mouse2[2]);
 262         return ((l2 == l) && (c2 == c));
 263 }
 264
 265 int choord_square (int line, int col) {
 266         if (uncover_square (line, col)) return 1;
 267         AROUND(line,col)
 268                 if (AR_CELL.f != FLAG) {
 269                         if (uncover_square (ROW, COL))
 270                                  return 1;
 271                 }
 272
 273         return 0;
 274 }
 275
 276 int uncover_square (int l, int c) {
 277         if (f.c[l][c].o == OPENED)
 278                 return 0; /* nothing to do */
 279
 280         f.c[l][c].o = OPENED;
 281         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 282         redraw_cell (l, c, NORMAL);
 283
 284         if (f.c[l][c].m) {
 285                 f.c[l][c].m = DEATH_MINE;
 286                 return 1;
 287         }
 288
 289         /* check for chording */
 290         if (f.c[l][c].n == 0) {
 291                 AROUND(l, c)
 292                         if (uncover_square (ROW, COL)) return 1;
 293         }
 294
 295         return 0;
 296 }
 297
 298 void flag_square (int l, int c) {
 299         static char modechar[] = {'*', '!', '?'};
 300
 301         if (f.c[l][c].o != CLOSED) return;
 302         /* cycle through flag/quesm/noflag: */
 303         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 304         if (f.c[l][c].f==FLAG) g.f++;
 305         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 306                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 307         redraw_cell (l, c, NORMAL);
 308         move_ph (1, op.scheme->cell_width);
 309         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 310 }
 311
 312 void quesm_square (int l, int c) {
 313         /* toggle question mark / none. won't turn flags into question marks.
 314         unlike flag_square, this function doesn't respect `-q'. */
 315         if      (f.c[l][c].o != CLOSED) return;
 316         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 317         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 318         redraw_cell (l, c, NORMAL);
 319 }
 320
 321 int do_uncover (int* is_newgame, int actor) {
 322         if (*is_newgame == GAME_NEW) {
 323                 *is_newgame = GAME_INPROGRESS;
 324                 fill_minefield (g.p[0], g.p[1]);
 325                 timer_setup(1);
 326         }
 327
 328         if (HI_CELL.f == FLAG  ) return GAME_INPROGRESS;
 329         if (HI_CELL.o == CLOSED) {
 330                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 331         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 332                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 333         } else if (actor != MOUSE) {
 334                 show_stomp(1, g.p[0], g.p[1]);
 335
 336                 wait_stomp();
 337
 338                 show_stomp(0, g.p[0], g.p[1]);
 339         }
 340         if (everything_opened()) return GAME_WON;
 341
 342         return GAME_INPROGRESS;
 343 }
 344
 345 void set_mark(void) {
 346         int mark = tolower(getch_wrapper());
 347         if (mark < 'a' || mark > 'z') return; /*out of bound*/
 348
 349         g.m[mark-'a'].l = g.p[0];
 350         g.m[mark-'a'].c = g.p[1];
 351         g.m[mark-'a'].s = 1;
 352 }
 353
 354 void jump_mark(void) {
 355         int mark = tolower(getch_wrapper());
 356         /* check bounds and if set: */
 357         if (mark < 'a' || mark > 'z' || !g.m[mark-'a'].s) return;
 358         move_hi (g.m[mark-'a'].l, g.m[mark-'a'].c);
 359 }
 360
 361 void fill_minefield (int l, int c) {
 362         srand (time(0));
 363         int mines_set = f.m;
 364         while (mines_set) {
 365                 int line = rand() % f.h;
 366                 int col = rand() % f.w;
 367
 368                 if (f.c[line][col].m) {
 369                 /* skip if field already has a mine */
 370                         continue;
 371                 } else if ((line == l) && (col == c)) {
 372                 /* don't put a mine on the already opened (first click) field */
 373                         continue;
 374                 } else {
 375                         mines_set--;
 376                         f.c[line][col].m = STD_MINE;
 377                 }
 378         }
 379
 380         /* precalculate neighbours */
 381         for (int l=0; l < f.h; l++)
 382                 for (int c=0; c < f.w; c++)
 383                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 384 }
 385
 386 void move_ph (int line, int col) {
 387         /* move printhead to zero-indexed position */
 388         printf ("\033[%d;%dH", line+1, col+1);
 389 }
 390
 391 void move_hi (int l, int c) {
 392         /* move cursor and highlight to absolute coordinates */
 393
 394         redraw_cell (g.p[0], g.p[1], NORMAL);
 395         /* update g.p */
 396         g.p[0] = CLAMP(l, 0, f.h-1);
 397         g.p[1] = CLAMP(c, 0, f.w-1);
 398         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 399
 400         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 401 }
 402
 403 /* to_next_boundary(): move into the supplied direction until a change in open-
 404 state or flag-state is found and move there. falls back to BIG_MOVE. */
 405 #define FIND_BOUND(X, L, C, L1, C1, MAX, OP) do {\
 406         new_ ## X OP ## = BIG_MOVE;\
 407         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 408                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 409                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 410                         new_ ## X = i OP 1;\
 411                         break;\
 412                 }\
 413         } while(0)
 414 void to_next_boundary (int l, int c, char direction) {
 415         int new_l = l;
 416         int new_c = c;
 417         switch (direction) {
 418         case '>': FIND_BOUND(c, l, i, l, i+1, w, +); break;
 419         case '<': FIND_BOUND(c, l, i, l, i-1, w, -); break;
 420         case '^': FIND_BOUND(l, i, c, i-1, c, h, -); break;
 421         case 'v': FIND_BOUND(l, i, c, i+1, c, h, +); break;
 422         }
 423
 424         move_hi (new_l, new_c);
 425 }
 426 #undef FIND_BOUND
 427
 428 #define CELL f.c[g.p[0]][c]
 429 #define FIND_NEXT(CONDITION, DIRECTION) do {\
 430         int plusminus = DIRECTION-'='; /* -1 if '<', 1 if '>' */ \
 431         for (int c = g.p[1]+plusminus; c >= 0 && c < f.w; c+=plusminus) \
 432                 if (CONDITION) { \
 433                         move_hi (g.p[0], c); \
 434                         return 1; /* NOTE: break didn't work */ \
 435                 } \
 436                 return 0; \
 437         } while(0)
 438 int find (int what, char direction) {
 439         switch (what) {
 440         case ' ': what = '0'; /* fallthrough */
 441         case '0': case '1': case '2':
 442         case '3': case '4': case '5':
 443         case '6': case '7': case '8': /* numbers, opened */
 444                             FIND_NEXT(CELL.o && CELL.n == what-'0', direction);
 445         case 'o':           FIND_NEXT(CELL.o, direction);       /* any opened */
 446         case 'c':           FIND_NEXT(!CELL.o, direction);      /* any closed */
 447         case 'f': case 'i': FIND_NEXT(CELL.f==FLAG, direction); /* is flagged */
 448         case 'q': case '?': FIND_NEXT(CELL.f==QUESM, direction);/* questioned */
 449         }
 450
 451         return 0;
 452 }
 453 #undef FIND_NEXT
 454 #undef CELL
 455
 456 void till (int what, char direction) {
 457         /* if we found what we were looking for move one cell back */
 458         if (find (what, direction)) move_hi(g.p[0], g.p[1]-(direction-'='));
 459 }
 460 void after (int what, char direction) {
 461         /* if we found what we were looking for move one more cell */
 462         if (find (what, direction)) move_hi(g.p[0], g.p[1]+(direction-'='));
 463 }
 464
 465 char* cell2schema (int l, int c, int mode) {
 466         struct minecell cell = f.c[l][c];
 467
 468         if (mode == SHOWMINES) return (
 469                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 470                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 471                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 472                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 473                 cell.o == CLOSED          ? op.scheme->field_closed:
 474                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 475          else return (
 476                 cell.f == FLAG            ? op.scheme->field_flagged:
 477                 cell.f == QUESM           ? op.scheme->field_question:
 478                 cell.o == CLOSED          ? op.scheme->field_closed:
 479                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 480                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 481                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 482 }
 483
 484 void redraw_cell (int l, int c, int mode) {
 485         move_ph (l+LINE_OFFSET, field2screen_c(c));
 486         if (mode == HIGHLIGHT) printf ("\033[7m"); /* reverse video */
 487         print (cell2schema(l, c, mode));
 488         if (mode == HIGHLIGHT) printf ("\033[0m"); /* reset all */
 489 }
 490
 491 char* get_emoticon(void) {
 492         return g.o==GAME_WON ? EMOT(WON):
 493                g.o==GAME_LOST? EMOT(DEAD):
 494                 EMOT(SMILE);
 495 }
 496
 497 /* https://zserge.com/blog/c-for-loop-tricks.html */
 498 #define print_line(which) \
 499         for (int _break = (printf("%s", BORDER(which,LEFT)), 1); _break; \
 500                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 501 #define print_border(which, width) \
 502         print_line(which) printm (width, BORDER(which,MIDDLE))
 503 void show_minefield (int mode) {
 504         //TODO: in `-d' mode if f.w is odd we are 1 char short in the status line
 505         //TODO: in `-d' mode we need to specify a charset to print lowercase (-> resize mode)
 506         int dtime = difftime (time(NULL), g.t)*!!g.t;
 507         int half_spaces = f.w*op.scheme->cell_width/2;
 508         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 509         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 510         static char modechar[] = {'*', '!', '?'};
 511
 512         move_ph (0,0);
 513
 514         print_border(TOP, f.w);
 515         print_line(STATUS) {
 516                 if (mode == RESIZEMODE) printf ("%-*s", 2*half_spaces,
 517                   f.w*CW>53?"Resize Mode: HJKL to resize, Enter to set, Q to abort":
 518                   f.w*CW>25?"Resize Mode: HJKL/Enter/Q":"HJKL/Enter/Q");
 519                 else printf("[%03d%c]%*s%s%*s[%03d]",
 520                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 521                   left_spaces,"", get_emoticon(), right_spaces,"",
 522                   /* [ */ dtime /* ] */);
 523         }
 524         print_border(DIVIDER, f.w);
 525         /* main body */
 526         for (int l = 0; l < f.h; l++) print_line(FIELD)
 527                 printm (f.w, cell2schema(l, _loop, mode));
 528         print_border(BOTTOM, f.w);
 529 }
 530
 531 void show_stomp (int enable, int l, int c) {
 532         if (enable) {
 533                 if (f.c[l][c].o == OPENED && get_neighbours (l, c, 1) != 0) {
 534                         /* show the stomp radius if we aren't fully flagged */
 535                         AROUND(l, c)
 536                                 if (AR_CELL.o == CLOSED && AR_CELL.f != FLAG)
 537                                         redraw_cell (ROW, COL, HIGHLIGHT);
 538                         fflush(stdout); /* won't display without */
 539
 540                 }
 541         } else {
 542                 AROUND(l, c) redraw_cell (ROW, COL, g.o?SHOWMINES:NORMAL);
 543         }
 544 }
 545
 546 void wait_stomp (void) {
 547         /* block SIGALRM, otherwise poll gets cancelled by the timer: */
 548         sigset_t sig;
 549         sigemptyset (&sig);
 550         sigaddset(&sig, SIGALRM);
 551         sigprocmask (SIG_BLOCK, &sig, NULL);
 552
 553         /* wait for timout or keypress: */
 554         struct pollfd fds;
 555         fds.fd = 0; fds.events = POLLIN;
 556         poll(&fds, 1, STOMP_TIMEOUT);
 557
 558         /* restore signal mask: */
 559         sigprocmask (SIG_UNBLOCK, &sig, NULL);
 560 }
 561
 562 int get_neighbours (int line, int col, int reduced_mode) {
 563         /* counts mines surrounding a square
 564            modes: 0=normal; 1=reduced */
 565
 566         int count = 0;
 567         AROUND(line, col) {
 568                 count += !!AR_CELL.m;
 569                 count -= reduced_mode * AR_CELL.f==FLAG;
 570         }
 571         return count;
 572 }
 573
 574 void interactive_resize(void) {
 575         unsigned char buf[3];
 576         int old_w = f.w;
 577         int old_h = f.h;
 578         for(;;) {
 579                 screen_setup(1); /* clears the screen */
 580                 show_minefield (RESIZEMODE);
 581                 /* show the new field size in the corner: */
 582                 move_ph(f.h+LINE_OFFSET-1,COL_OFFSET);
 583                 printf("%d x %d", f.w, f.h);
 584
 585                 free_field(); /* must free before resizing! */
 586                 switch (getctrlseq(buf)) {
 587                 case CTRSEQ_CURSOR_LEFT: case 'h': f.w--; break;
 588                 case CTRSEQ_CURSOR_DOWN: case 'j': f.h++; break;
 589                 case CTRSEQ_CURSOR_UP:   case 'k': f.h--; break;
 590                 case CTRSEQ_CURSOR_RIGHT:case 'l': f.w++; break;
 591                 case 'w': f.w+=BIG_MOVE; break;
 592                 case 'b': f.w-=BIG_MOVE; break;
 593                 case 'u': f.h-=BIG_MOVE; break;
 594                 case 'd': f.h+=BIG_MOVE; break;
 595                 case 0xa: return; /* enter */
 596                 case 'q': /* abort */
 597                         f.w = old_w;
 598                         f.h = old_h;
 599                         screen_setup(1);
 600                         return;
 601                 }
 602
 603                 clamp_fieldsize();
 604                 f.m = mines_percentage(f.w, f.h);
 605                 f.c = alloc_array (f.h, f.w);
 606         }
 607 }
 608
 609 struct minecell** alloc_array (int lines, int cols) {
 610         free_field (); /* NOTE: this feels like a hack :| */
 611         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 612         if (a == NULL) return NULL;
 613         for (int l = 0; l < lines; l++) {
 614                 a[l] = calloc (cols, sizeof(struct minecell));
 615                 if (a[l] == NULL) goto unalloc;
 616         }
 617
 618         return a;
 619 unalloc:
 620         for (int l = 0; l < lines; l++)
 621                 free (a[l]);
 622         return NULL;
 623 }
 624
 625 void free_field (void) {
 626         if (f.c == NULL) return;
 627         for (int l = 0; l < f.h; l++) {
 628                 free (f.c[l]);
 629         }
 630
 631         free (f.c);
 632         f.c = NULL;
 633 }
 634
 635 int screen2field_l (int l) {
 636         return (l-LINE_OFFSET) - 1;
 637 }
 638 int screen2field_c (int c) {
 639         /* this depends on the cell width and only works when it is 1 or 2. */
 640         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 641 }
 642 int field2screen_c (int c) {
 643         return (CW*c+COL_OFFSET - (CW%2));
 644 }
 645 int clicked_emoticon (unsigned char* mouse) {
 646         return (mouse[2] == LINE_OFFSET-1 && (
 647                 mouse[1] == f.w+COL_OFFSET ||
 648                 mouse[1] == f.w+COL_OFFSET+1));
 649 }
 650
 651 enum esc_states {
 652         START,
 653         ESC_SENT,
 654         CSI_SENT,
 655         MOUSE_EVENT,
 656 };
 657 int getctrlseq (unsigned char* buf) {
 658         int c;
 659         int state = START;
 660         int offset = 0x20; /* never sends control chars as data */
 661         while ((c = getchar()) != EOF) {
 662                 switch (state) {
 663                 case START:
 664                         switch (c) {
 665                         case '\033': state=ESC_SENT; break;
 666                         default: return c;
 667                         }
 668                         break;
 669                 case ESC_SENT:
 670                         switch (c) {
 671                         case '[': state=CSI_SENT; break;
 672                         default: return CTRSEQ_INVALID;
 673                         }
 674                         break;
 675                 case CSI_SENT:
 676                         switch (c) {
 677                         case 'A': return CTRSEQ_CURSOR_UP;
 678                         case 'B': return CTRSEQ_CURSOR_DOWN;
 679                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 680                         case 'D': return CTRSEQ_CURSOR_LEFT;
 681                         case 'M': state=MOUSE_EVENT; break;
 682                         default: return CTRSEQ_INVALID;
 683                         }
 684                         break;
 685                 case MOUSE_EVENT:
 686                         buf[0] = c - offset;
 687                         buf[1] = getchar() - offset;
 688                         buf[2] = getchar() - offset;
 689                         return CTRSEQ_MOUSE;
 690                 default:
 691                         return CTRSEQ_INVALID;
 692                 }
 693         }
 694         return 2;
 695 }
 696
 697 int getch(unsigned char* buf) {
 698 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 699 compatible with the ncurses implementation of same name */
 700         int action = getctrlseq(buf);
 701         int l, c;
 702         switch (action) {
 703         case CTRSEQ_MOUSE:
 704                 l = screen2field_l (buf[2]);
 705                 c = screen2field_c (buf[1]);
 706
 707                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 708                 int success = wait_mouse_up(l, c);
 709
 710                 /* mouse moved while pressed: */
 711                 if (!success) return CTRSEQ_INVALID;
 712
 713                 switch (buf[0]) {
 714                 case 0: return CTRSEQ_MOUSE_LEFT;
 715                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 716                 case 2: return CTRSEQ_MOUSE_RIGHT;
 717                 }
 718         }
 719
 720         return action;
 721 }
 722
 723 int getch_wrapper (void) {
 724         unsigned char mouse[3];
 725         int c;
 726         /*skip over ASCII_STX=0x02 that gets sent when returning from SIGALRM:*/
 727         while ( (c = getch(mouse)) == 0x02);
 728
 729         if (c == CTRSEQ_MOUSE_LEFT || c == CTRSEQ_MOUSE_RIGHT) {
 730                 if (clicked_emoticon(mouse))
 731                         return WRAPPER_EMOTICON;
 732
 733                 if (screen2field_c (mouse[1]) < 0
 734                  || screen2field_c (mouse[1]) >= f.w
 735                  || screen2field_l (mouse[2]) < 0
 736                  || screen2field_l (mouse[2]) >= f.h)
 737                         return CTRSEQ_INVALID;
 738
 739                 g.p[0] = screen2field_l (mouse[2]);
 740                 g.p[1] = screen2field_c (mouse[1]);
 741
 742                 return c; /* CTRSEQ_MOUSE_LEFT || CTRSEQ_MOUSE_RIGHT */
 743         }
 744
 745         return c;
 746 }
 747
 748 void clamp_fieldsize (void) {
 749         /* clamp field size to terminal size and mouse maximum: */
 750         struct winsize w;
 751         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 752
 753         if (f.w < 1) f.w = 1;
 754         if (f.h < 1) f.h = 1;
 755
 756         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 757                 f.w = (w.ws_col - COL_OFFSET - COL_OFFSET)/op.scheme->display_width;
 758         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 759                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 760         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 761                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 762         if (LINE_OFFSET + f.h > MOUSE_MAX)
 763                 f.h = MOUSE_MAX - LINE_OFFSET;
 764 }
 765
 766 int mines_percentage(int w, int h) {
 767         return w*h*(w*h<30*16?.15625:.20625);
 768 }
 769
 770 int parse_fieldspec(char* str) {
 771         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 772         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 773
 774         clamp_fieldsize();
 775
 776         if (n < 2) {
 777                 return 1; /* error */
 778         } else if (n == 2) {
 779                 f.m = mines_percentage(f.w, f.h);
 780         }
 781
 782         f.m = MIN(f.m, (f.w-1) * (f.h-1)); /* limit mines */
 783
 784         return 0;
 785 }
 786
 787 void timer_setup (int enable) {
 788         static struct itimerval tbuf;
 789         tbuf.it_interval.tv_sec  = 1;
 790         tbuf.it_interval.tv_usec = 0;
 791
 792         if (enable) {
 793                 g.t = time(NULL);
 794                 tbuf.it_value.tv_sec  = 1;
 795                 tbuf.it_value.tv_usec = 0;
 796                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 797                         perror("setitimer");
 798                         exit(1);
 799                 }
 800         } else {
 801                 tbuf.it_value.tv_sec  = 0;
 802                 tbuf.it_value.tv_usec = 0;
 803                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 804                         perror("setitimer");
 805                         exit(1);
 806                 }
 807         }
 808
 809 }
 810
 811 void signal_setup (void) {
 812         struct sigaction saction;
 813
 814         saction.sa_handler = signal_handler;
 815         sigemptyset(&saction.sa_mask);
 816         saction.sa_flags   = 0;
 817         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 818                 perror("SIGALRM");
 819                 exit(1);
 820         }
 821
 822         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 823                 perror ("SIGINT");
 824                 exit (1);
 825         }
 826 }
 827
 828 void signal_handler (int signum) {
 829         int dtime;
 830         switch (signum) {
 831         case SIGALRM:
 832                 dtime = difftime (time(NULL), g.t);
 833                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 834                 printf ("[%03d]", g.t?dtime:0);
 835                 break;
 836         case SIGINT:
 837                 exit(128+SIGINT);
 838         }
 839 }
 840
 841 void screen_setup (int enable) {
 842         if (enable) {
 843                 raw_mode(1);
 844                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 845                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 846                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 847                 print (op.scheme->init_seq); /* swich charset, if necessary */
 848         } else {
 849                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 850                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 851                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 852                 raw_mode(0);
 853         }
 854 }
 855
 856 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 857 void raw_mode(int enable) {
 858         static struct termios saved_term_mode;
 859         struct termios raw_term_mode;
 860
 861         if (enable) {
 862                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 863                 raw_term_mode = saved_term_mode;
 864                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 865                 raw_term_mode.c_cc[VMIN] = 1 ;
 866                 raw_term_mode.c_cc[VTIME] = 0;
 867                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 868         } else {
 869                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 870         }
 871 }