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