mines.c

   1 /*******************************************************************************
   2  minesviiper 0.5
   3  By Tobias Girstmair, 2015 - 2018
   4
   5  ./minesviiper 16x16x40
   6  (see ./minesviiper -h for full list of options)
   7
   8  MOUSE MODE: - left click to open and choord
   9              - right click to flag/unflag
  10  VI MODE:    - hjkl to move cursor left/down/up/right
  11              - o/space to open and choord
  12              - i to flag/unflag
  13              - (see `./minesviiper -h' for all keybindings)
  14
  15  GNU GPL v3, see LICENSE or https://www.gnu.org/licenses/gpl-3.0.txt
  16 *******************************************************************************/
  17
  18
  19 #define _POSIX_C_SOURCE 2 /*for getopt, sigaction in c99*/
  20 #include <ctype.h>
  21 #include <poll.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <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 LINE_BELOW LINE_OFFSET+f.h-1+LINES_AFTER
  51 #define CTRL_ 0x1F &
  52
  53 #define AR_CELL f.c[ROW][COL] /* helper for AROUND() */
  54 #define AROUND(l, c) /* gives us loop-variables ROW, COL, AR_CELL */ \
  55         for (int ROW = MAX(l-1, 0); ROW <= MIN(l+1, f.h-1); ROW++) \
  56                 for (int COL = MAX(c-1, 0); COL <= MIN(c+1, f.w-1); COL++) \
  57                         if (!(ROW == l && COL == c)) /* skip itself */
  58
  59 #define PAUSE_TIMER \
  60         for (int _break=(timer_setup(0),1); _break; _break=0, timer_setup(g.t))
  61
  62 struct minefield f;
  63 struct game g;
  64 struct opt op;
  65
  66 int main (int argc, char** argv) {
  67         /* defaults: */
  68         f.w = 30;
  69         f.h = 16;
  70         f.m = 99;
  71         op.scheme = &symbols_mono;
  72         op.mode = FLAG;
  73
  74         int optget;
  75         opterr = 0; /* don't print message on unrecognized option */
  76         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
  77                 switch (optget) {
  78                 case 'n': op.mode    = NOFLAG; break;
  79                 case 'f': op.mode    = FLAG; break; /*default*/
  80                 case 'q': op.mode    = QUESM; break; /*WARN:implicitly sets -f*/
  81                 case 'c': op.scheme  = &symbols_col1; break;
  82                 case 'd': op.scheme  = &symbols_doublewidth; break;
  83                 case 'h':
  84                 default:
  85                         fprintf (stderr, SHORTHELP LONGHELP, argv[0]);
  86                         return !(optget=='h');
  87                 }
  88         } if (optind < argc) { /* parse Fieldspec */
  89                 if (parse_fieldspec (argv[optind])) {
  90                         fprintf (stderr, SHORTHELP FIELDHELP, argv[0]);
  91                         return 1;
  92                 }
  93         }
  94
  95         signal_setup();
  96         screen_setup(1);
  97         atexit (*quit);
  98
  99 newgame:
 100         switch (minesviiper()) {
 101         case GAME_NEW: goto newgame;
 102         case GAME_WON: g.o = GAME_WON; break;
 103         case GAME_LOST:g.o = GAME_LOST;break;
 104         case GAME_QUIT:goto quit;
 105         }
 106
 107         timer_setup(0); /* stop timer */
 108         int show_how = g.o==GAME_WON?SHOWFLAGS:SHOWMINES;
 109         show_minefield (show_how);
 110         for(;;) {
 111                 switch(getch_wrapper()) {
 112                 case WRAPPER_EMOTICON:
 113                 case 'r': goto newgame;
 114                 case 'q': goto quit;
 115                 case CTRL_'L': //TODO: updates the timer (fix in show_minefield())
 116                         screen_setup(1);
 117                         show_minefield (show_how);
 118                         break;
 119                 case CTRL_'R':
 120                         interactive_resize();
 121                         goto newgame;
 122                 }
 123         }
 124
 125 quit:
 126         return 0;
 127 }
 128
 129 int minesviiper(void) {
 130         f.c = alloc_array (f.h, f.w);
 131         g = (const struct game){0}; /* reset all game-specific parameters */
 132
 133         show_minefield (NORMAL);
 134
 135         for(;;) {
 136                 int actor = KEYBOARD; /* WARN: feels like a hack :| */
 137                 switch (getch_wrapper()) {
 138                 case ' ':
 139                         if (HI_CELL.o == OPENED) goto open_cell;
 140                         if (g.s == MODE_OPEN)  goto open_cell;
 141                         if (g.s == MODE_FLAG)  goto flag_cell;
 142                         if (g.s == MODE_QUESM) goto quesm_cell;
 143                         break;
 144                 case 'e':
 145                         g.s = (g.s+1)%(op.mode+1);
 146                         show_minefield (g.c?SHOWMINES:NORMAL);
 147                         break;
 148                 case CTRSEQ_MOUSE_LEFT:
 149                         actor = MOUSE;
 150                         /* fallthrough */
 151                 open_cell:
 152                 case 'o':
 153                         switch (do_uncover(&(g.n), actor)) {
 154                                 case GAME_LOST: return GAME_LOST;
 155                                 case GAME_WON:  return GAME_WON;
 156                         }
 157                         break;
 158                 flag_cell:
 159                 case CTRSEQ_MOUSE_RIGHT:
 160                 case 'i': flag_square (g.p[0], g.p[1]); break;
 161                 quesm_cell:
 162                 case '?':quesm_square (g.p[0], g.p[1]); break;
 163                 case CTRSEQ_CURSOR_LEFT:
 164                 case 'h': move_hi (g.p[0],   g.p[1]-1); break;
 165                 case CTRSEQ_CURSOR_DOWN:
 166                 case 'j': move_hi (g.p[0]+1, g.p[1]  ); break;
 167                 case CTRSEQ_CURSOR_UP:
 168                 case 'k': move_hi (g.p[0]-1, g.p[1]  ); break;
 169                 case CTRSEQ_CURSOR_RIGHT:
 170                 case 'l': move_hi (g.p[0],   g.p[1]+1); break;
 171                 case 'w': to_next_boundary (g.p[0], g.p[1], '>'); break;
 172                 case 'b': to_next_boundary (g.p[0], g.p[1], '<'); break;
 173                 case 'u': to_next_boundary (g.p[0], g.p[1], '^'); break;
 174                 case 'd': to_next_boundary (g.p[0], g.p[1], 'v'); break;
 175                 case '0': /* fallthrough */
 176                 case '^': move_hi (g.p[0],    0        ); break;
 177                 case '$': move_hi (g.p[0],    f.w-1    ); break;
 178                 case 'g': move_hi (0,         g.p[1]   ); break;
 179                 case 'G': move_hi (f.h-1,     g.p[1]   ); break;
 180                 case 'z': move_hi (f.h/2, f.w/2); break;
 181                 case 'm': set_mark(); break;
 182                 case'\'': /* fallthrough */
 183                 case '`': jump_mark(); break;
 184                 case 'f': find(getch_wrapper(), '>'); break;
 185                 case 'F': find(getch_wrapper(), '<'); break;
 186                 case 't': till(getch_wrapper(), '>'); break;
 187                 case 'T': till(getch_wrapper(), '<'); break;
 188                 case 'a': after(getch_wrapper(),'>'); break;
 189                 case 'A': after(getch_wrapper(),'<'); break;
 190                 case WRAPPER_EMOTICON:
 191                 case 'r': timer_setup(0); return GAME_NEW;
 192                 case ':':
 193                         switch (ex_cmd()) {
 194                         case 'q': return GAME_QUIT;
 195                         default:
 196                                 fprintf (stdout, "\rinvalid command"); //stderr does not work?
 197                                 PAUSE_TIMER ungetc(getchar(), stdin);
 198                                 printf("\033[2K"); //fflush(stdout);/*clear line*/
 199                         }
 200                         break;
 201                 case 'q': //TODO: redefine `q' as macro functionality
 202                         move_ph (LINE_BELOW, 0);
 203                         printf ("quit game? [Y/n]");
 204                         if (getch_wrapper() != 'n') return GAME_QUIT;
 205                         move_ph (LINE_BELOW, 0);
 206                         printf("\033[2K"); fflush(stdout); /* clear line */
 207                         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 208                         break;
 209                 case CTRL_'L':
 210                         screen_setup(1);
 211                         show_minefield (NORMAL);
 212                         break;
 213                 case CTRL_'R':
 214                         timer_setup(0);
 215                         interactive_resize();
 216                         return GAME_NEW;
 217                 case '\\':
 218                         if (g.n == GAME_NEW) break; /* must open a cell first */
 219                         g.c = !g.c;
 220                         show_minefield (g.c?SHOWMINES:NORMAL);
 221                         break;
 222                 }
 223         }
 224
 225 }
 226
 227 void quit (void) {
 228         screen_setup(0);
 229         free_field ();
 230 }
 231
 232 /* I haven't won as long as a cell exists, that
 233     - I haven't opened, and
 234     - is not a mine */
 235 int everything_opened (void) {
 236         for (int row = 0; row < f.h; row++)
 237                 for (int col = 0; col < f.w; col++)
 238                         if (f.c[row][col].o == CLOSED &&
 239                             f.c[row][col].m == NO_MINE  ) return 0;
 240         return 1;
 241 }
 242
 243 int wait_mouse_up (int l, int c) { /* TODO: should not take minefield-coords but absolute ones */
 244         unsigned char mouse2[3];
 245         int level = 1;
 246         int l2, c2;
 247
 248         /* show :o face */
 249         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 250
 251         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 252                 /* show a pushed-in button if cursor is on minefield */
 253                 redraw_cell (l, c, HIGHLIGHT);
 254
 255                 show_stomp(1, l, c);
 256         }
 257
 258         while (level > 0) {
 259                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 260                         /* ignore mouse wheel events: */
 261                         if (mouse2[0] & 0x40) continue;
 262
 263                         else if((mouse2[0]&3) == 3) level--; /* release event */
 264                         else level++; /* another button pressed */
 265                 }
 266         }
 267
 268         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 269
 270         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 271                 redraw_cell (l, c, g.o?SHOWMINES:NORMAL);
 272                 show_stomp(0, l, c);
 273         }
 274         c2 = screen2field_c(mouse2[1]);
 275         l2 = screen2field_l(mouse2[2]);
 276         return ((l2 == l) && (c2 == c));
 277 }
 278
 279 int choord_square (int line, int col) {
 280         if (uncover_square (line, col)) return 1;
 281         AROUND(line,col)
 282                 if (AR_CELL.f != FLAG) {
 283                         if (uncover_square (ROW, COL))
 284                                  return 1;
 285                 }
 286
 287         return 0;
 288 }
 289
 290 int uncover_square (int l, int c) {
 291         if (f.c[l][c].o == OPENED)
 292                 return 0; /* nothing to do */
 293
 294         f.c[l][c].o = OPENED;
 295         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 296         redraw_cell (l, c, NORMAL);
 297
 298         if (f.c[l][c].m) {
 299                 f.c[l][c].m = DEATH_MINE;
 300                 return 1;
 301         }
 302
 303         /* check for chording */
 304         if (f.c[l][c].n == 0) {
 305                 AROUND(l, c)
 306                         if (uncover_square (ROW, COL)) return 1;
 307         }
 308
 309         return 0;
 310 }
 311
 312 void flag_square (int l, int c) {
 313         static char modechar[] = {'*', '!', '?'};
 314
 315         if (f.c[l][c].o != CLOSED) return;
 316         /* cycle through flag/quesm/noflag: */
 317         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 318         if (f.c[l][c].f==FLAG) g.f++;
 319         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 320                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 321         redraw_cell (l, c, NORMAL);
 322         move_ph (1, op.scheme->cell_width);
 323         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 324 }
 325
 326 void quesm_square (int l, int c) {
 327         /* toggle question mark / none. won't turn flags into question marks.
 328         unlike flag_square, this function doesn't respect `-q'. */
 329         if      (f.c[l][c].o != CLOSED) return;
 330         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 331         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 332         redraw_cell (l, c, NORMAL);
 333 }
 334
 335 int do_uncover (int* is_newgame, int actor) {
 336         if (*is_newgame == GAME_NEW) {
 337                 *is_newgame = GAME_INPROGRESS;
 338                 fill_minefield (g.p[0], g.p[1]);
 339                 timer_setup(1);
 340         }
 341
 342         if (HI_CELL.f == FLAG  ) return GAME_INPROGRESS;
 343         if (HI_CELL.o == CLOSED) {
 344                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 345         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 346                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 347         } else if (actor != MOUSE) {
 348                 show_stomp(1, g.p[0], g.p[1]);
 349
 350                 wait_stomp();
 351
 352                 show_stomp(0, g.p[0], g.p[1]);
 353         }
 354         if (everything_opened()) return GAME_WON;
 355
 356         return GAME_INPROGRESS;
 357 }
 358
 359 int ex_cmd(void) {
 360         //TODO:currently returns the first letter entered, but should in the future return an enum value
 361         char what[256];
 362         timer_setup(0); /* timer spams ASCII STX (0x02) chars -- NOTE: maybe also 0xff? */
 363         PAUSE_TIMER {
 364                 move_ph(LINE_BELOW, 0);
 365                 putchar(':'); /* prompt */
 366
 367                 raw_mode(0); /* use cooked mode, so we get line editing for free */
 368                 scanf(" %s", what); //TODO: cancel on ^G, ESC, ^C, ...
 369                 getchar();//get 0x10 char left in buffer by scanf
 370                 raw_mode(1);
 371
 372                 move_ph(LINE_BELOW, 0);
 373                 printf ("\033[0J"); //clear from here to the end of the screen
 374         }
 375         return what[0];
 376 }
 377 void set_mark(void) {
 378         int mark = tolower(getch_wrapper());
 379         if (mark < 'a' || mark > 'z') return; /*out of bound*/
 380
 381         g.m[mark-'a'].l = g.p[0];
 382         g.m[mark-'a'].c = g.p[1];
 383         g.m[mark-'a'].s = 1;
 384 }
 385
 386 void jump_mark(void) {
 387         int mark = tolower(getch_wrapper());
 388         /* check bounds and if set: */
 389         if (mark < 'a' || mark > 'z' || !g.m[mark-'a'].s) return;
 390         move_hi (g.m[mark-'a'].l, g.m[mark-'a'].c);
 391 }
 392
 393 void fill_minefield (int l, int c) {
 394         srand (time(0));
 395         int mines_set = f.m;
 396         while (mines_set) {
 397                 int line = rand() % f.h;
 398                 int col = rand() % f.w;
 399
 400                 if (f.c[line][col].m) {
 401                 /* skip if field already has a mine */
 402                         continue;
 403                 } else if ((line == l) && (col == c)) {
 404                 /* don't put a mine on the already opened (first click) field */
 405                         continue;
 406                 } else {
 407                         mines_set--;
 408                         f.c[line][col].m = STD_MINE;
 409                 }
 410         }
 411
 412         /* precalculate neighbours */
 413         for (int l=0; l < f.h; l++)
 414                 for (int c=0; c < f.w; c++)
 415                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 416 }
 417
 418 void move_ph (int line, int col) {
 419         /* move printhead to zero-indexed position */
 420         printf ("\033[%d;%dH", line+1, col+1);
 421 }
 422
 423 void move_hi (int l, int c) {
 424         /* move cursor and highlight to absolute coordinates */
 425
 426         redraw_cell (g.p[0], g.p[1], NORMAL);
 427         /* update g.p */
 428         g.p[0] = CLAMP(l, 0, f.h-1);
 429         g.p[1] = CLAMP(c, 0, f.w-1);
 430         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 431
 432         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 433 }
 434
 435 /* to_next_boundary(): move into the supplied direction until a change in open-
 436 state or flag-state is found and move there. falls back to BIG_MOVE. */
 437 #define FIND_BOUND(X, L, C, L1, C1, MAX, OP) do {\
 438         new_ ## X OP ## = BIG_MOVE;\
 439         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 440                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 441                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 442                         new_ ## X = i OP 1;\
 443                         break;\
 444                 }\
 445         } while(0)
 446 void to_next_boundary (int l, int c, char direction) {
 447         int new_l = l;
 448         int new_c = c;
 449         switch (direction) {
 450         case '>': FIND_BOUND(c, l, i, l, i+1, w, +); break;
 451         case '<': FIND_BOUND(c, l, i, l, i-1, w, -); break;
 452         case '^': FIND_BOUND(l, i, c, i-1, c, h, -); break;
 453         case 'v': FIND_BOUND(l, i, c, i+1, c, h, +); break;
 454         }
 455
 456         move_hi (new_l, new_c);
 457 }
 458 #undef FIND_BOUND
 459
 460 #define CELL f.c[g.p[0]][c]
 461 #define FIND_NEXT(CONDITION, DIRECTION) do {\
 462         int plusminus = DIRECTION-'='; /* -1 if '<', 1 if '>' */ \
 463         for (int c = g.p[1]+plusminus; c >= 0 && c < f.w; c+=plusminus) \
 464                 if (CONDITION) { \
 465                         move_hi (g.p[0], c); \
 466                         return 1; /* NOTE: break didn't work */ \
 467                 } \
 468                 return 0; \
 469         } while(0)
 470 int find (int what, char direction) {
 471         switch (what) {
 472         case ' ': what = '0'; /* fallthrough */
 473         case '0': case '1': case '2':
 474         case '3': case '4': case '5':
 475         case '6': case '7': case '8': /* numbers, opened */
 476                             FIND_NEXT(CELL.o && CELL.n == what-'0', direction);
 477         case 'o':           FIND_NEXT(CELL.o, direction);       /* any opened */
 478         case 'c':           FIND_NEXT(!CELL.o, direction);      /* any closed */
 479         case 'f': case 'i': FIND_NEXT(CELL.f==FLAG, direction); /* is flagged */
 480         case 'q': case '?': FIND_NEXT(CELL.f==QUESM, direction);/* questioned */
 481         }
 482
 483         return 0;
 484 }
 485 #undef FIND_NEXT
 486 #undef CELL
 487
 488 void till (int what, char direction) {
 489         /* if we found what we were looking for move one cell back */
 490         if (find (what, direction)) move_hi(g.p[0], g.p[1]-(direction-'='));
 491 }
 492 void after (int what, char direction) {
 493         /* if we found what we were looking for move one more cell */
 494         if (find (what, direction)) move_hi(g.p[0], g.p[1]+(direction-'='));
 495 }
 496
 497 char* cell2schema (int l, int c, int mode) {
 498         struct minecell cell = f.c[l][c];
 499
 500         if (mode == SHOWMINES) return (
 501                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 502                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 503                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 504                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 505                 cell.o == CLOSED          ? op.scheme->field_closed:
 506                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 507         else if (mode == SHOWFLAGS) return (
 508                 /* on win (everything opened, only correct flags left) */
 509                 cell.m == STD_MINE        ? op.scheme->field_flagged:
 510                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 511         else return (
 512                 cell.f == FLAG            ? op.scheme->field_flagged:
 513                 cell.f == QUESM           ? op.scheme->field_question:
 514                 cell.o == CLOSED          ? op.scheme->field_closed:
 515                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 516                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 517                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 518 }
 519
 520 void redraw_cell (int l, int c, int mode) {
 521         move_ph (l+LINE_OFFSET, field2screen_c(c));
 522         if (mode == HIGHLIGHT) printf ("\033[7m"); /* reverse video */
 523         print (cell2schema(l, c, mode));
 524         if (mode == HIGHLIGHT) printf ("\033[0m"); /* reset all */
 525 }
 526
 527 char* get_emoticon(void) {
 528         return g.o==GAME_WON ? EMOT(WON):
 529                g.o==GAME_LOST? EMOT(DEAD):
 530                 EMOT(SMILE);
 531 }
 532
 533 /* https://zserge.com/blog/c-for-loop-tricks.html */
 534 #define print_line(which) \
 535         for (int _break = (printf("%s", BORDER(which,LEFT)), 1); _break; \
 536                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 537 #define print_border(which, width) \
 538         print_line(which) printm (width, BORDER(which,MIDDLE))
 539 void show_minefield (int mode) {
 540         //TODO: in `-d' mode if f.w is odd we are 1 char short in the status line
 541         //TODO: in `-d' mode we need to specify a charset to print lowercase (-> resize mode)
 542         int dtime = difftime (time(NULL), g.t)*!!g.t;
 543         int half_spaces = f.w*op.scheme->cell_width/2;
 544         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 545         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 546         static char modechar[] = {'*', '!', '?'};
 547
 548         move_ph (0,0);
 549
 550         print_border(TOP, f.w);
 551         print_line(STATUS) {
 552                 if (mode == RESIZEMODE) printf ("%-*s", 2*half_spaces,
 553                   f.w*CW>53?"Resize Mode: HJKL to resize, Enter to set, Q to abort":
 554                   f.w*CW>25?"Resize Mode: HJKL/Enter/Q":"HJKL/Enter/Q");
 555                 else printf("[%03d%c]%*s%s%*s[%03d]",
 556                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 557                   left_spaces,"", get_emoticon(), right_spaces,"",
 558                   /* [ */ dtime /* ] */);
 559         }
 560         print_border(DIVIDER, f.w);
 561         /* main body */
 562         for (int l = 0; l < f.h; l++) print_line(FIELD)
 563                 printm (f.w, cell2schema(l, _loop, mode));
 564         print_border(BOTTOM, f.w);
 565 }
 566
 567 void show_stomp (int enable, int l, int c) {
 568         if (enable) {
 569                 if (f.c[l][c].o == OPENED && get_neighbours (l, c, 1) != 0) {
 570                         /* show the stomp radius if we aren't fully flagged */
 571                         AROUND(l, c)
 572                                 if (AR_CELL.o == CLOSED && AR_CELL.f != FLAG)
 573                                         redraw_cell (ROW, COL, HIGHLIGHT);
 574                         fflush(stdout); /* won't display without */
 575
 576                 }
 577         } else {
 578                 AROUND(l, c) redraw_cell (ROW, COL, g.o?SHOWMINES:NORMAL);
 579         }
 580 }
 581
 582 void wait_stomp (void) {
 583         /* block SIGALRM, otherwise poll gets cancelled by the timer: */
 584         sigset_t sig;
 585         sigemptyset (&sig);
 586         sigaddset(&sig, SIGALRM);
 587         sigprocmask (SIG_BLOCK, &sig, NULL);
 588
 589         /* wait for timout or keypress: */
 590         struct pollfd fds;
 591         fds.fd = 0; fds.events = POLLIN;
 592         poll(&fds, 1, STOMP_TIMEOUT);
 593
 594         /* restore signal mask: */
 595         sigprocmask (SIG_UNBLOCK, &sig, NULL);
 596 }
 597
 598 int get_neighbours (int line, int col, int reduced_mode) {
 599         /* counts mines surrounding a square
 600            modes: 0=normal; 1=reduced */
 601
 602         int count = 0;
 603         AROUND(line, col) {
 604                 count += !!AR_CELL.m;
 605                 count -= reduced_mode * AR_CELL.f==FLAG;
 606         }
 607         return count;
 608 }
 609
 610 void interactive_resize(void) {
 611         unsigned char buf[3];
 612         int old_w = f.w;
 613         int old_h = f.h;
 614         for(;;) {
 615                 screen_setup(1); /* clears the screen */
 616                 show_minefield (RESIZEMODE);
 617                 /* show the new field size in the corner: */
 618                 move_ph(f.h+LINE_OFFSET-1,COL_OFFSET);
 619                 printf("%d x %d", f.w, f.h);
 620
 621                 free_field(); /* must free before resizing! */
 622                 switch (getctrlseq(buf)) {
 623                 case CTRSEQ_CURSOR_LEFT: case 'h': f.w--; break;
 624                 case CTRSEQ_CURSOR_DOWN: case 'j': f.h++; break;
 625                 case CTRSEQ_CURSOR_UP:   case 'k': f.h--; break;
 626                 case CTRSEQ_CURSOR_RIGHT:case 'l': f.w++; break;
 627                 case 'w': f.w+=BIG_MOVE; break;
 628                 case 'b': f.w-=BIG_MOVE; break;
 629                 case 'u': f.h-=BIG_MOVE; break;
 630                 case 'd': f.h+=BIG_MOVE; break;
 631                 case 0xa: return; /* enter */
 632                 case 'q': /* abort */
 633                         f.w = old_w;
 634                         f.h = old_h;
 635                         screen_setup(1);
 636                         return;
 637                 }
 638
 639                 clamp_fieldsize();
 640                 f.m = mines_percentage(f.w, f.h);
 641                 f.c = alloc_array (f.h, f.w);
 642         }
 643 }
 644
 645 struct minecell** alloc_array (int lines, int cols) {
 646         free_field (); /* NOTE: this feels like a hack :| */
 647         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 648         if (a == NULL) return NULL;
 649         for (int l = 0; l < lines; l++) {
 650                 a[l] = calloc (cols, sizeof(struct minecell));
 651                 if (a[l] == NULL) goto unalloc;
 652         }
 653
 654         return a;
 655 unalloc:
 656         for (int l = 0; l < lines; l++)
 657                 free (a[l]);
 658         return NULL;
 659 }
 660
 661 void free_field (void) {
 662         if (f.c == NULL) return;
 663         for (int l = 0; l < f.h; l++) {
 664                 free (f.c[l]);
 665         }
 666
 667         free (f.c);
 668         f.c = NULL;
 669 }
 670
 671 int screen2field_l (int l) {
 672         return (l-LINE_OFFSET) - 1;
 673 }
 674 int screen2field_c (int c) {
 675         /* this depends on the cell width and only works when it is 1 or 2. */
 676         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 677 }
 678 int field2screen_c (int c) {
 679         return (CW*c+COL_OFFSET - (CW%2));
 680 }
 681 int clicked_emoticon (unsigned char* mouse) {
 682         return (mouse[2] == LINE_OFFSET-1 && (
 683                 mouse[1] == f.w+COL_OFFSET ||
 684                 mouse[1] == f.w+COL_OFFSET+1));
 685 }
 686
 687 enum esc_states {
 688         START,
 689         ESC_SENT,
 690         CSI_SENT,
 691         MOUSE_EVENT,
 692 };
 693 int getctrlseq (unsigned char* buf) {
 694         int c;
 695         int state = START;
 696         int offset = 0x20; /* never sends control chars as data */
 697         while ((c = getchar()) != EOF) {
 698                 switch (state) {
 699                 case START:
 700                         switch (c) {
 701                         case '\033': state=ESC_SENT; break;
 702                         default: return c;
 703                         }
 704                         break;
 705                 case ESC_SENT:
 706                         switch (c) {
 707                         case '[': state=CSI_SENT; break;
 708                         default: return CTRSEQ_INVALID;
 709                         }
 710                         break;
 711                 case CSI_SENT:
 712                         switch (c) {
 713                         case 'A': return CTRSEQ_CURSOR_UP;
 714                         case 'B': return CTRSEQ_CURSOR_DOWN;
 715                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 716                         case 'D': return CTRSEQ_CURSOR_LEFT;
 717                         case 'M': state=MOUSE_EVENT; break;
 718                         default: return CTRSEQ_INVALID;
 719                         }
 720                         break;
 721                 case MOUSE_EVENT:
 722                         buf[0] = c - offset;
 723                         buf[1] = getchar() - offset;
 724                         buf[2] = getchar() - offset;
 725                         return CTRSEQ_MOUSE;
 726                 default:
 727                         return CTRSEQ_INVALID;
 728                 }
 729         }
 730         return 2;
 731 }
 732
 733 int getch(unsigned char* buf) {
 734 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 735 compatible with the ncurses implementation of same name */
 736         int action = getctrlseq(buf);
 737         int l, c;
 738         switch (action) {
 739         case CTRSEQ_MOUSE:
 740                 l = screen2field_l (buf[2]);
 741                 c = screen2field_c (buf[1]);
 742
 743                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 744                 int success = wait_mouse_up(l, c);
 745
 746                 /* mouse moved while pressed: */
 747                 if (!success) return CTRSEQ_INVALID;
 748
 749                 switch (buf[0]) {
 750                 case 0: return CTRSEQ_MOUSE_LEFT;
 751                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 752                 case 2: return CTRSEQ_MOUSE_RIGHT;
 753                 }
 754         }
 755
 756         return action;
 757 }
 758
 759 int getch_wrapper (void) {
 760         unsigned char mouse[3];
 761         int c;
 762         /*skip over ASCII_STX=0x02 that gets sent when returning from SIGALRM:*/
 763         while ( (c = getch(mouse)) == 0x02);
 764
 765         if (c == CTRSEQ_MOUSE_LEFT || c == CTRSEQ_MOUSE_RIGHT) {
 766                 if (clicked_emoticon(mouse))
 767                         return WRAPPER_EMOTICON;
 768
 769                 if (screen2field_c (mouse[1]) < 0
 770                  || screen2field_c (mouse[1]) >= f.w
 771                  || screen2field_l (mouse[2]) < 0
 772                  || screen2field_l (mouse[2]) >= f.h)
 773                         return CTRSEQ_INVALID;
 774
 775                 g.p[0] = screen2field_l (mouse[2]);
 776                 g.p[1] = screen2field_c (mouse[1]);
 777
 778                 return c; /* CTRSEQ_MOUSE_LEFT || CTRSEQ_MOUSE_RIGHT */
 779         }
 780
 781         return c;
 782 }
 783
 784 void clamp_fieldsize (void) {
 785         /* clamp field size to terminal size and mouse maximum: */
 786         struct winsize w;
 787         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 788
 789         if (f.w < 1) f.w = 1;
 790         if (f.h < 1) f.h = 1;
 791
 792         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 793                 f.w = (w.ws_col - COL_OFFSET - COL_OFFSET)/op.scheme->display_width;
 794         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 795                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 796         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 797                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 798         if (LINE_OFFSET + f.h > MOUSE_MAX)
 799                 f.h = MOUSE_MAX - LINE_OFFSET;
 800 }
 801
 802 int mines_percentage(int w, int h) {
 803         return w*h*(w*h<30*16?.15625:.20625);
 804 }
 805
 806 int parse_fieldspec(char* str) {
 807         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 808         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 809
 810         clamp_fieldsize();
 811
 812         if (n < 2) {
 813                 return 1; /* error */
 814         } else if (n == 2) {
 815                 f.m = mines_percentage(f.w, f.h);
 816         }
 817
 818         f.m = MIN(f.m, (f.w-1) * (f.h-1)); /* limit mines */
 819
 820         return 0;
 821 }
 822
 823 void timer_setup (int enable) {
 824         static struct itimerval tbuf;
 825         tbuf.it_interval.tv_sec  = 1;
 826         tbuf.it_interval.tv_usec = 0;
 827
 828         if (enable) {
 829                 g.t = time(NULL);
 830                 tbuf.it_value.tv_sec  = 1;
 831                 tbuf.it_value.tv_usec = 0;
 832                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 833                         perror("setitimer");
 834                         exit(1);
 835                 }
 836         } else {
 837                 tbuf.it_value.tv_sec  = 0;
 838                 tbuf.it_value.tv_usec = 0;
 839                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 840                         perror("setitimer");
 841                         exit(1);
 842                 }
 843         }
 844
 845 }
 846
 847 void signal_setup (void) {
 848         struct sigaction saction;
 849
 850         saction.sa_handler = signal_handler;
 851         sigemptyset(&saction.sa_mask);
 852         saction.sa_flags   = 0;
 853         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 854                 perror("SIGALRM");
 855                 exit(1);
 856         }
 857
 858         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 859                 perror ("SIGINT");
 860                 exit (1);
 861         }
 862 }
 863
 864 void signal_handler (int signum) {
 865         int dtime;
 866         switch (signum) {
 867         case SIGALRM:
 868                 dtime = difftime (time(NULL), g.t);
 869                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 870                 printf ("[%03d]", g.t?dtime:0);
 871                 break;
 872         case SIGINT:
 873                 exit(128+SIGINT);
 874         }
 875 }
 876
 877 void screen_setup (int enable) {
 878         if (enable) {
 879                 raw_mode(1);
 880                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 881                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 882                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 883                 print (op.scheme->init_seq); /* swich charset, if necessary */
 884         } else {
 885                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 886                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 887                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 888                 raw_mode(0);
 889         }
 890 }
 891
 892 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 893 void raw_mode(int enable) {
 894         static struct termios saved_term_mode;
 895         struct termios raw_term_mode;
 896
 897         if (enable) {
 898                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 899                 raw_term_mode = saved_term_mode;
 900                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 901                 raw_term_mode.c_cc[VMIN] = 1 ;
 902                 raw_term_mode.c_cc[VTIME] = 0;
 903                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 904         } else {
 905                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 906         }
 907 }