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