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