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         int show_how = g.o==GAME_WON?SHOWFLAGS:SHOWMINES;
 105         show_minefield (show_how);
 106         for(;;) {
 107                 switch(getch_wrapper()) {
 108                 case WRAPPER_EMOTICON:
 109                 case 'r': goto newgame;
 110                 case 'q': goto quit;
 111                 case CTRL_'L': //TODO: updates the timer (fix in show_minefield())
 112                         screen_setup(1);
 113                         show_minefield (show_how);
 114                         break;
 115                 case CTRL_'R':
 116                         interactive_resize();
 117                         goto newgame;
 118                 }
 119         }
 120
 121 quit:
 122         return 0;
 123 }
 124
 125 int minesviiper(void) {
 126         f.c = alloc_array (f.h, f.w);
 127         g = (const struct game){0}; /* reset all game-specific parameters */
 128
 129         show_minefield (NORMAL);
 130
 131         for(;;) {
 132                 int actor = KEYBOARD; /* WARN: feels like a hack :| */
 133                 switch (getch_wrapper()) {
 134                 case ' ':
 135                         if (HI_CELL.o == OPENED) goto open_cell;
 136                         if (g.s == MODE_OPEN)  goto open_cell;
 137                         if (g.s == MODE_FLAG)  goto flag_cell;
 138                         if (g.s == MODE_QUESM) goto quesm_cell;
 139                         break;
 140                 case 'e':
 141                         g.s = (g.s+1)%(op.mode+1);
 142                         show_minefield (g.c?SHOWMINES:NORMAL);
 143                         break;
 144                 case CTRSEQ_MOUSE_LEFT:
 145                         actor = MOUSE;
 146                         /* fallthrough */
 147                 open_cell:
 148                 case 'o':
 149                         switch (do_uncover(&(g.n), actor)) {
 150                                 case GAME_LOST: return GAME_LOST;
 151                                 case GAME_WON:  return GAME_WON;
 152                         }
 153                         break;
 154                 flag_cell:
 155                 case CTRSEQ_MOUSE_RIGHT:
 156                 case 'i': flag_square (g.p[0], g.p[1]); break;
 157                 quesm_cell:
 158                 case '?':quesm_square (g.p[0], g.p[1]); break;
 159                 case CTRSEQ_CURSOR_LEFT:
 160                 case 'h': move_hi (g.p[0],   g.p[1]-1); break;
 161                 case CTRSEQ_CURSOR_DOWN:
 162                 case 'j': move_hi (g.p[0]+1, g.p[1]  ); break;
 163                 case CTRSEQ_CURSOR_UP:
 164                 case 'k': move_hi (g.p[0]-1, g.p[1]  ); break;
 165                 case CTRSEQ_CURSOR_RIGHT:
 166                 case 'l': move_hi (g.p[0],   g.p[1]+1); break;
 167                 case 'w': to_next_boundary (g.p[0], g.p[1], '>'); break;
 168                 case 'b': to_next_boundary (g.p[0], g.p[1], '<'); break;
 169                 case 'u': to_next_boundary (g.p[0], g.p[1], '^'); break;
 170                 case 'd': to_next_boundary (g.p[0], g.p[1], 'v'); break;
 171                 case '0': /* fallthrough */
 172                 case '^': move_hi (g.p[0],    0        ); break;
 173                 case '$': move_hi (g.p[0],    f.w-1    ); break;
 174                 case 'g': move_hi (0,         g.p[1]   ); break;
 175                 case 'G': move_hi (f.h-1,     g.p[1]   ); break;
 176                 case 'z': move_hi (f.h/2, f.w/2); break;
 177                 case 'm': set_mark(); break;
 178                 case'\'': /* fallthrough */
 179                 case '`': jump_mark(); break;
 180                 case 'f': find(getch_wrapper(), '>'); break;
 181                 case 'F': find(getch_wrapper(), '<'); break;
 182                 case 't': till(getch_wrapper(), '>'); break;
 183                 case 'T': till(getch_wrapper(), '<'); break;
 184                 case 'a': after(getch_wrapper(),'>'); break;
 185                 case 'A': after(getch_wrapper(),'<'); break;
 186                 case WRAPPER_EMOTICON:
 187                 case 'r': timer_setup(0); return GAME_NEW;
 188                 case 'q':
 189                         move_ph (f.h-1+LINE_OFFSET+LINES_AFTER, 0);
 190                         printf ("quit game? [Y/n]");
 191                         if (getch_wrapper() != 'n') return GAME_QUIT;
 192                         move_ph (f.h-1+LINE_OFFSET+LINES_AFTER, 0);
 193                         printf("\033[2K"); fflush(stdout); /* clear line */
 194                         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 195                         break;
 196                 case CTRL_'L':
 197                         screen_setup(1);
 198                         show_minefield (NORMAL);
 199                         break;
 200                 case CTRL_'R':
 201                         timer_setup(0);
 202                         interactive_resize();
 203                         return GAME_NEW;
 204                 case '\\':
 205                         if (g.n == GAME_NEW) break; /* must open a cell first */
 206                         g.c = !g.c;
 207                         show_minefield (g.c?SHOWMINES:NORMAL);
 208                         break;
 209                 }
 210         }
 211
 212 }
 213
 214 void quit (void) {
 215         screen_setup(0);
 216         free_field ();
 217 }
 218
 219 /* I haven't won as long as a cell exists, that
 220     - I haven't opened, and
 221     - is not a mine */
 222 int everything_opened (void) {
 223         for (int row = 0; row < f.h; row++)
 224                 for (int col = 0; col < f.w; col++)
 225                         if (f.c[row][col].o == CLOSED &&
 226                             f.c[row][col].m == NO_MINE  ) return 0;
 227         return 1;
 228 }
 229
 230 int wait_mouse_up (int l, int c) { /* TODO: should not take minefield-coords but absolute ones */
 231         unsigned char mouse2[3];
 232         int level = 1;
 233         int l2, c2;
 234
 235         /* show :o face */
 236         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 237
 238         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 239                 /* show a pushed-in button if cursor is on minefield */
 240                 redraw_cell (l, c, HIGHLIGHT);
 241
 242                 show_stomp(1, l, c);
 243         }
 244
 245         while (level > 0) {
 246                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 247                         /* ignore mouse wheel events: */
 248                         if (mouse2[0] & 0x40) continue;
 249
 250                         else if((mouse2[0]&3) == 3) level--; /* release event */
 251                         else level++; /* another button pressed */
 252                 }
 253         }
 254
 255         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 256
 257         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 258                 redraw_cell (l, c, g.o?SHOWMINES:NORMAL);
 259                 show_stomp(0, l, c);
 260         }
 261         c2 = screen2field_c(mouse2[1]);
 262         l2 = screen2field_l(mouse2[2]);
 263         return ((l2 == l) && (c2 == c));
 264 }
 265
 266 int choord_square (int line, int col) {
 267         if (uncover_square (line, col)) return 1;
 268         AROUND(line,col)
 269                 if (AR_CELL.f != FLAG) {
 270                         if (uncover_square (ROW, COL))
 271                                  return 1;
 272                 }
 273
 274         return 0;
 275 }
 276
 277 int uncover_square (int l, int c) {
 278         if (f.c[l][c].o == OPENED)
 279                 return 0; /* nothing to do */
 280
 281         f.c[l][c].o = OPENED;
 282         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 283         redraw_cell (l, c, NORMAL);
 284
 285         if (f.c[l][c].m) {
 286                 f.c[l][c].m = DEATH_MINE;
 287                 return 1;
 288         }
 289
 290         /* check for chording */
 291         if (f.c[l][c].n == 0) {
 292                 AROUND(l, c)
 293                         if (uncover_square (ROW, COL)) return 1;
 294         }
 295
 296         return 0;
 297 }
 298
 299 void flag_square (int l, int c) {
 300         static char modechar[] = {'*', '!', '?'};
 301
 302         if (f.c[l][c].o != CLOSED) return;
 303         /* cycle through flag/quesm/noflag: */
 304         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 305         if (f.c[l][c].f==FLAG) g.f++;
 306         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 307                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 308         redraw_cell (l, c, NORMAL);
 309         move_ph (1, op.scheme->cell_width);
 310         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 311 }
 312
 313 void quesm_square (int l, int c) {
 314         /* toggle question mark / none. won't turn flags into question marks.
 315         unlike flag_square, this function doesn't respect `-q'. */
 316         if      (f.c[l][c].o != CLOSED) return;
 317         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 318         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 319         redraw_cell (l, c, NORMAL);
 320 }
 321
 322 int do_uncover (int* is_newgame, int actor) {
 323         if (*is_newgame == GAME_NEW) {
 324                 *is_newgame = GAME_INPROGRESS;
 325                 fill_minefield (g.p[0], g.p[1]);
 326                 timer_setup(1);
 327         }
 328
 329         if (HI_CELL.f == FLAG  ) return GAME_INPROGRESS;
 330         if (HI_CELL.o == CLOSED) {
 331                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 332         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 333                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 334         } else if (actor != MOUSE) {
 335                 show_stomp(1, g.p[0], g.p[1]);
 336
 337                 wait_stomp();
 338
 339                 show_stomp(0, g.p[0], g.p[1]);
 340         }
 341         if (everything_opened()) return GAME_WON;
 342
 343         return GAME_INPROGRESS;
 344 }
 345
 346 void set_mark(void) {
 347         int mark = tolower(getch_wrapper());
 348         if (mark < 'a' || mark > 'z') return; /*out of bound*/
 349
 350         g.m[mark-'a'].l = g.p[0];
 351         g.m[mark-'a'].c = g.p[1];
 352         g.m[mark-'a'].s = 1;
 353 }
 354
 355 void jump_mark(void) {
 356         int mark = tolower(getch_wrapper());
 357         /* check bounds and if set: */
 358         if (mark < 'a' || mark > 'z' || !g.m[mark-'a'].s) return;
 359         move_hi (g.m[mark-'a'].l, g.m[mark-'a'].c);
 360 }
 361
 362 void fill_minefield (int l, int c) {
 363         srand (time(0));
 364         int mines_set = f.m;
 365         while (mines_set) {
 366                 int line = rand() % f.h;
 367                 int col = rand() % f.w;
 368
 369                 if (f.c[line][col].m) {
 370                 /* skip if field already has a mine */
 371                         continue;
 372                 } else if ((line == l) && (col == c)) {
 373                 /* don't put a mine on the already opened (first click) field */
 374                         continue;
 375                 } else {
 376                         mines_set--;
 377                         f.c[line][col].m = STD_MINE;
 378                 }
 379         }
 380
 381         /* precalculate neighbours */
 382         for (int l=0; l < f.h; l++)
 383                 for (int c=0; c < f.w; c++)
 384                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 385 }
 386
 387 void move_ph (int line, int col) {
 388         /* move printhead to zero-indexed position */
 389         printf ("\033[%d;%dH", line+1, col+1);
 390 }
 391
 392 void move_hi (int l, int c) {
 393         /* move cursor and highlight to absolute coordinates */
 394
 395         redraw_cell (g.p[0], g.p[1], NORMAL);
 396         /* update g.p */
 397         g.p[0] = CLAMP(l, 0, f.h-1);
 398         g.p[1] = CLAMP(c, 0, f.w-1);
 399         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 400
 401         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 402 }
 403
 404 /* to_next_boundary(): move into the supplied direction until a change in open-
 405 state or flag-state is found and move there. falls back to BIG_MOVE. */
 406 #define FIND_BOUND(X, L, C, L1, C1, MAX, OP) do {\
 407         new_ ## X OP ## = BIG_MOVE;\
 408         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 409                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 410                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 411                         new_ ## X = i OP 1;\
 412                         break;\
 413                 }\
 414         } while(0)
 415 void to_next_boundary (int l, int c, char direction) {
 416         int new_l = l;
 417         int new_c = c;
 418         switch (direction) {
 419         case '>': FIND_BOUND(c, l, i, l, i+1, w, +); break;
 420         case '<': FIND_BOUND(c, l, i, l, i-1, w, -); break;
 421         case '^': FIND_BOUND(l, i, c, i-1, c, h, -); break;
 422         case 'v': FIND_BOUND(l, i, c, i+1, c, h, +); break;
 423         }
 424
 425         move_hi (new_l, new_c);
 426 }
 427 #undef FIND_BOUND
 428
 429 #define CELL f.c[g.p[0]][c]
 430 #define FIND_NEXT(CONDITION, DIRECTION) do {\
 431         int plusminus = DIRECTION-'='; /* -1 if '<', 1 if '>' */ \
 432         for (int c = g.p[1]+plusminus; c >= 0 && c < f.w; c+=plusminus) \
 433                 if (CONDITION) { \
 434                         move_hi (g.p[0], c); \
 435                         return 1; /* NOTE: break didn't work */ \
 436                 } \
 437                 return 0; \
 438         } while(0)
 439 int find (int what, char direction) {
 440         switch (what) {
 441         case ' ': what = '0'; /* fallthrough */
 442         case '0': case '1': case '2':
 443         case '3': case '4': case '5':
 444         case '6': case '7': case '8': /* numbers, opened */
 445                             FIND_NEXT(CELL.o && CELL.n == what-'0', direction);
 446         case 'o':           FIND_NEXT(CELL.o, direction);       /* any opened */
 447         case 'c':           FIND_NEXT(!CELL.o, direction);      /* any closed */
 448         case 'f': case 'i': FIND_NEXT(CELL.f==FLAG, direction); /* is flagged */
 449         case 'q': case '?': FIND_NEXT(CELL.f==QUESM, direction);/* questioned */
 450         }
 451
 452         return 0;
 453 }
 454 #undef FIND_NEXT
 455 #undef CELL
 456
 457 void till (int what, char direction) {
 458         /* if we found what we were looking for move one cell back */
 459         if (find (what, direction)) move_hi(g.p[0], g.p[1]-(direction-'='));
 460 }
 461 void after (int what, char direction) {
 462         /* if we found what we were looking for move one more cell */
 463         if (find (what, direction)) move_hi(g.p[0], g.p[1]+(direction-'='));
 464 }
 465
 466 char* cell2schema (int l, int c, int mode) {
 467         struct minecell cell = f.c[l][c];
 468
 469         if (mode == SHOWMINES) return (
 470                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 471                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 472                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 473                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 474                 cell.o == CLOSED          ? op.scheme->field_closed:
 475                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 476         else if (mode == SHOWFLAGS) return (
 477                 /* on win (everything opened, only correct flags left) */
 478                 cell.m == STD_MINE        ? op.scheme->field_flagged:
 479                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 480         else return (
 481                 cell.f == FLAG            ? op.scheme->field_flagged:
 482                 cell.f == QUESM           ? op.scheme->field_question:
 483                 cell.o == CLOSED          ? op.scheme->field_closed:
 484                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 485                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 486                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 487 }
 488
 489 void redraw_cell (int l, int c, int mode) {
 490         move_ph (l+LINE_OFFSET, field2screen_c(c));
 491         if (mode == HIGHLIGHT) printf ("\033[7m"); /* reverse video */
 492         print (cell2schema(l, c, mode));
 493         if (mode == HIGHLIGHT) printf ("\033[0m"); /* reset all */
 494 }
 495
 496 char* get_emoticon(void) {
 497         return g.o==GAME_WON ? EMOT(WON):
 498                g.o==GAME_LOST? EMOT(DEAD):
 499                 EMOT(SMILE);
 500 }
 501
 502 /* https://zserge.com/blog/c-for-loop-tricks.html */
 503 #define print_line(which) \
 504         for (int _break = (printf("%s", BORDER(which,LEFT)), 1); _break; \
 505                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 506 #define print_border(which, width) \
 507         print_line(which) printm (width, BORDER(which,MIDDLE))
 508 void show_minefield (int mode) {
 509         //TODO: in `-d' mode if f.w is odd we are 1 char short in the status line
 510         //TODO: in `-d' mode we need to specify a charset to print lowercase (-> resize mode)
 511         int dtime = difftime (time(NULL), g.t)*!!g.t;
 512         int half_spaces = f.w*op.scheme->cell_width/2;
 513         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 514         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 515         static char modechar[] = {'*', '!', '?'};
 516
 517         move_ph (0,0);
 518
 519         print_border(TOP, f.w);
 520         print_line(STATUS) {
 521                 if (mode == RESIZEMODE) printf ("%-*s", 2*half_spaces,
 522                   f.w*CW>53?"Resize Mode: HJKL to resize, Enter to set, Q to abort":
 523                   f.w*CW>25?"Resize Mode: HJKL/Enter/Q":"HJKL/Enter/Q");
 524                 else printf("[%03d%c]%*s%s%*s[%03d]",
 525                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 526                   left_spaces,"", get_emoticon(), right_spaces,"",
 527                   /* [ */ dtime /* ] */);
 528         }
 529         print_border(DIVIDER, f.w);
 530         /* main body */
 531         for (int l = 0; l < f.h; l++) print_line(FIELD)
 532                 printm (f.w, cell2schema(l, _loop, mode));
 533         print_border(BOTTOM, f.w);
 534 }
 535
 536 void show_stomp (int enable, int l, int c) {
 537         if (enable) {
 538                 if (f.c[l][c].o == OPENED && get_neighbours (l, c, 1) != 0) {
 539                         /* show the stomp radius if we aren't fully flagged */
 540                         AROUND(l, c)
 541                                 if (AR_CELL.o == CLOSED && AR_CELL.f != FLAG)
 542                                         redraw_cell (ROW, COL, HIGHLIGHT);
 543                         fflush(stdout); /* won't display without */
 544
 545                 }
 546         } else {
 547                 AROUND(l, c) redraw_cell (ROW, COL, g.o?SHOWMINES:NORMAL);
 548         }
 549 }
 550
 551 void wait_stomp (void) {
 552         /* block SIGALRM, otherwise poll gets cancelled by the timer: */
 553         sigset_t sig;
 554         sigemptyset (&sig);
 555         sigaddset(&sig, SIGALRM);
 556         sigprocmask (SIG_BLOCK, &sig, NULL);
 557
 558         /* wait for timout or keypress: */
 559         struct pollfd fds;
 560         fds.fd = 0; fds.events = POLLIN;
 561         poll(&fds, 1, STOMP_TIMEOUT);
 562
 563         /* restore signal mask: */
 564         sigprocmask (SIG_UNBLOCK, &sig, NULL);
 565 }
 566
 567 int get_neighbours (int line, int col, int reduced_mode) {
 568         /* counts mines surrounding a square
 569            modes: 0=normal; 1=reduced */
 570
 571         int count = 0;
 572         AROUND(line, col) {
 573                 count += !!AR_CELL.m;
 574                 count -= reduced_mode * AR_CELL.f==FLAG;
 575         }
 576         return count;
 577 }
 578
 579 void interactive_resize(void) {
 580         unsigned char buf[3];
 581         int old_w = f.w;
 582         int old_h = f.h;
 583         for(;;) {
 584                 screen_setup(1); /* clears the screen */
 585                 show_minefield (RESIZEMODE);
 586                 /* show the new field size in the corner: */
 587                 move_ph(f.h+LINE_OFFSET-1,COL_OFFSET);
 588                 printf("%d x %d", f.w, f.h);
 589
 590                 free_field(); /* must free before resizing! */
 591                 switch (getctrlseq(buf)) {
 592                 case CTRSEQ_CURSOR_LEFT: case 'h': f.w--; break;
 593                 case CTRSEQ_CURSOR_DOWN: case 'j': f.h++; break;
 594                 case CTRSEQ_CURSOR_UP:   case 'k': f.h--; break;
 595                 case CTRSEQ_CURSOR_RIGHT:case 'l': f.w++; break;
 596                 case 'w': f.w+=BIG_MOVE; break;
 597                 case 'b': f.w-=BIG_MOVE; break;
 598                 case 'u': f.h-=BIG_MOVE; break;
 599                 case 'd': f.h+=BIG_MOVE; break;
 600                 case 0xa: return; /* enter */
 601                 case 'q': /* abort */
 602                         f.w = old_w;
 603                         f.h = old_h;
 604                         screen_setup(1);
 605                         return;
 606                 }
 607
 608                 clamp_fieldsize();
 609                 f.m = mines_percentage(f.w, f.h);
 610                 f.c = alloc_array (f.h, f.w);
 611         }
 612 }
 613
 614 struct minecell** alloc_array (int lines, int cols) {
 615         free_field (); /* NOTE: this feels like a hack :| */
 616         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 617         if (a == NULL) return NULL;
 618         for (int l = 0; l < lines; l++) {
 619                 a[l] = calloc (cols, sizeof(struct minecell));
 620                 if (a[l] == NULL) goto unalloc;
 621         }
 622
 623         return a;
 624 unalloc:
 625         for (int l = 0; l < lines; l++)
 626                 free (a[l]);
 627         return NULL;
 628 }
 629
 630 void free_field (void) {
 631         if (f.c == NULL) return;
 632         for (int l = 0; l < f.h; l++) {
 633                 free (f.c[l]);
 634         }
 635
 636         free (f.c);
 637         f.c = NULL;
 638 }
 639
 640 int screen2field_l (int l) {
 641         return (l-LINE_OFFSET) - 1;
 642 }
 643 int screen2field_c (int c) {
 644         /* this depends on the cell width and only works when it is 1 or 2. */
 645         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 646 }
 647 int field2screen_c (int c) {
 648         return (CW*c+COL_OFFSET - (CW%2));
 649 }
 650 int clicked_emoticon (unsigned char* mouse) {
 651         return (mouse[2] == LINE_OFFSET-1 && (
 652                 mouse[1] == f.w+COL_OFFSET ||
 653                 mouse[1] == f.w+COL_OFFSET+1));
 654 }
 655
 656 enum esc_states {
 657         START,
 658         ESC_SENT,
 659         CSI_SENT,
 660         MOUSE_EVENT,
 661 };
 662 int getctrlseq (unsigned char* buf) {
 663         int c;
 664         int state = START;
 665         int offset = 0x20; /* never sends control chars as data */
 666         while ((c = getchar()) != EOF) {
 667                 switch (state) {
 668                 case START:
 669                         switch (c) {
 670                         case '\033': state=ESC_SENT; break;
 671                         default: return c;
 672                         }
 673                         break;
 674                 case ESC_SENT:
 675                         switch (c) {
 676                         case '[': state=CSI_SENT; break;
 677                         default: return CTRSEQ_INVALID;
 678                         }
 679                         break;
 680                 case CSI_SENT:
 681                         switch (c) {
 682                         case 'A': return CTRSEQ_CURSOR_UP;
 683                         case 'B': return CTRSEQ_CURSOR_DOWN;
 684                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 685                         case 'D': return CTRSEQ_CURSOR_LEFT;
 686                         case 'M': state=MOUSE_EVENT; break;
 687                         default: return CTRSEQ_INVALID;
 688                         }
 689                         break;
 690                 case MOUSE_EVENT:
 691                         buf[0] = c - offset;
 692                         buf[1] = getchar() - offset;
 693                         buf[2] = getchar() - offset;
 694                         return CTRSEQ_MOUSE;
 695                 default:
 696                         return CTRSEQ_INVALID;
 697                 }
 698         }
 699         return 2;
 700 }
 701
 702 int getch(unsigned char* buf) {
 703 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 704 compatible with the ncurses implementation of same name */
 705         int action = getctrlseq(buf);
 706         int l, c;
 707         switch (action) {
 708         case CTRSEQ_MOUSE:
 709                 l = screen2field_l (buf[2]);
 710                 c = screen2field_c (buf[1]);
 711
 712                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 713                 int success = wait_mouse_up(l, c);
 714
 715                 /* mouse moved while pressed: */
 716                 if (!success) return CTRSEQ_INVALID;
 717
 718                 switch (buf[0]) {
 719                 case 0: return CTRSEQ_MOUSE_LEFT;
 720                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 721                 case 2: return CTRSEQ_MOUSE_RIGHT;
 722                 }
 723         }
 724
 725         return action;
 726 }
 727
 728 int getch_wrapper (void) {
 729         unsigned char mouse[3];
 730         int c;
 731         /*skip over ASCII_STX=0x02 that gets sent when returning from SIGALRM:*/
 732         while ( (c = getch(mouse)) == 0x02);
 733
 734         if (c == CTRSEQ_MOUSE_LEFT || c == CTRSEQ_MOUSE_RIGHT) {
 735                 if (clicked_emoticon(mouse))
 736                         return WRAPPER_EMOTICON;
 737
 738                 if (screen2field_c (mouse[1]) < 0
 739                  || screen2field_c (mouse[1]) >= f.w
 740                  || screen2field_l (mouse[2]) < 0
 741                  || screen2field_l (mouse[2]) >= f.h)
 742                         return CTRSEQ_INVALID;
 743
 744                 g.p[0] = screen2field_l (mouse[2]);
 745                 g.p[1] = screen2field_c (mouse[1]);
 746
 747                 return c; /* CTRSEQ_MOUSE_LEFT || CTRSEQ_MOUSE_RIGHT */
 748         }
 749
 750         return c;
 751 }
 752
 753 void clamp_fieldsize (void) {
 754         /* clamp field size to terminal size and mouse maximum: */
 755         struct winsize w;
 756         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 757
 758         if (f.w < 1) f.w = 1;
 759         if (f.h < 1) f.h = 1;
 760
 761         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 762                 f.w = (w.ws_col - COL_OFFSET - COL_OFFSET)/op.scheme->display_width;
 763         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 764                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 765         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 766                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 767         if (LINE_OFFSET + f.h > MOUSE_MAX)
 768                 f.h = MOUSE_MAX - LINE_OFFSET;
 769 }
 770
 771 int mines_percentage(int w, int h) {
 772         return w*h*(w*h<30*16?.15625:.20625);
 773 }
 774
 775 int parse_fieldspec(char* str) {
 776         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 777         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 778
 779         clamp_fieldsize();
 780
 781         if (n < 2) {
 782                 return 1; /* error */
 783         } else if (n == 2) {
 784                 f.m = mines_percentage(f.w, f.h);
 785         }
 786
 787         f.m = MIN(f.m, (f.w-1) * (f.h-1)); /* limit mines */
 788
 789         return 0;
 790 }
 791
 792 void timer_setup (int enable) {
 793         static struct itimerval tbuf;
 794         tbuf.it_interval.tv_sec  = 1;
 795         tbuf.it_interval.tv_usec = 0;
 796
 797         if (enable) {
 798                 g.t = time(NULL);
 799                 tbuf.it_value.tv_sec  = 1;
 800                 tbuf.it_value.tv_usec = 0;
 801                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 802                         perror("setitimer");
 803                         exit(1);
 804                 }
 805         } else {
 806                 tbuf.it_value.tv_sec  = 0;
 807                 tbuf.it_value.tv_usec = 0;
 808                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 809                         perror("setitimer");
 810                         exit(1);
 811                 }
 812         }
 813
 814 }
 815
 816 void signal_setup (void) {
 817         struct sigaction saction;
 818
 819         saction.sa_handler = signal_handler;
 820         sigemptyset(&saction.sa_mask);
 821         saction.sa_flags   = 0;
 822         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 823                 perror("SIGALRM");
 824                 exit(1);
 825         }
 826
 827         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 828                 perror ("SIGINT");
 829                 exit (1);
 830         }
 831 }
 832
 833 void signal_handler (int signum) {
 834         int dtime;
 835         switch (signum) {
 836         case SIGALRM:
 837                 dtime = difftime (time(NULL), g.t);
 838                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 839                 printf ("[%03d]", g.t?dtime:0);
 840                 break;
 841         case SIGINT:
 842                 exit(128+SIGINT);
 843         }
 844 }
 845
 846 void screen_setup (int enable) {
 847         if (enable) {
 848                 raw_mode(1);
 849                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 850                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 851                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 852                 print (op.scheme->init_seq); /* swich charset, if necessary */
 853         } else {
 854                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 855                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 856                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 857                 raw_mode(0);
 858         }
 859 }
 860
 861 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 862 void raw_mode(int enable) {
 863         static struct termios saved_term_mode;
 864         struct termios raw_term_mode;
 865
 866         if (enable) {
 867                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 868                 raw_term_mode = saved_term_mode;
 869                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 870                 raw_term_mode.c_cc[VMIN] = 1 ;
 871                 raw_term_mode.c_cc[VTIME] = 0;
 872                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 873         } else {
 874                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 875         }
 876 }