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                 case 'p':if(choord_around(g.p[0],g.p[1]))return GAME_LOST;break;
 166                 quesm_cell:
 167                 case '?':quesm_square (g.p[0], g.p[1]); break;
 168                 case CTRSEQ_CURSOR_LEFT:
 169                 case 'h': move_hi (g.p[0],   g.p[1]-1); break;
 170                 case CTRSEQ_CURSOR_DOWN:
 171                 case 'j': move_hi (g.p[0]+1, g.p[1]  ); break;
 172                 case CTRSEQ_CURSOR_UP:
 173                 case 'k': move_hi (g.p[0]-1, g.p[1]  ); break;
 174                 case CTRSEQ_CURSOR_RIGHT:
 175                 case 'l': move_hi (g.p[0],   g.p[1]+1); break;
 176                 case 'w': to_next_boundary (g.p[0], g.p[1], '>', 1); break;
 177                 case 'b': to_next_boundary (g.p[0], g.p[1], '<', 1); break;
 178                 case 'u': to_next_boundary (g.p[0], g.p[1], '^', 1); break;
 179                 case 'd': to_next_boundary (g.p[0], g.p[1], 'v', 1); break;
 180                 case 'e': to_next_boundary (g.p[0], g.p[1], '>', 0); break;
 181                 case '0': /* fallthrough */
 182                 case '^': move_hi (g.p[0], 0     ); break;
 183                 case '$': move_hi (g.p[0], f.w-1 ); break;
 184                 case 'g': move_hi (0,      g.p[1]); break;
 185                 case 'G': move_hi (f.h-1,  g.p[1]); break;
 186                 case 'z': move_hi (f.h/2,  f.w/2 ); break;
 187                 case 'm': set_mark(); break;
 188                 case'\'': /* fallthrough */
 189                 case '`': jump_mark(); break;
 190                 case 'f': find(getch_wrapper(), '>', 0); break;
 191                 case 'F': find(getch_wrapper(), '<', 0); break;
 192                 case 't': find(getch_wrapper(), '>',-1); break;
 193                 case 'T': find(getch_wrapper(), '<',-1); break;
 194                 case 'a': find(getch_wrapper(), '>',+1); break;
 195                 case 'A': find(getch_wrapper(), '<',+1); break;
 196                 //TODO: HJKL, ^H^J^K^L: <spacemode> up/down/left/right/45deg
 197                 case WRAPPER_EMOTICON:
 198                 case 'r': timer_setup(0); return GAME_NEW;
 199                 case ':':
 200                         switch (ex_cmd()) {
 201                         case EX_QUIT: return GAME_QUIT;
 202                         case EX_HELP: printf (KEYHELP); break;
 203                         case EX_RESZ:
 204                                 timer_setup(0);
 205                                 interactive_resize();
 206                                 return GAME_NEW;
 207                         default:
 208                                 printf ("\rinvalid command");
 209                                 PAUSE_TIMER ungetc(getchar(), stdin);
 210                                 printf("\033[2K"); /* clear line */
 211                         }
 212                         break;
 213                 case 'q': //TODO: redefine `q' as macro functionality
 214                         break;
 215                 case CTRL_'L':
 216                         screen_setup(1);
 217                         show_minefield (NORMAL);
 218                         break;
 219                 case '\\':
 220                         if (g.n == GAME_NEW) break; /* must open a cell first */
 221                         g.c = !g.c;
 222                         show_minefield (g.c?SHOWMINES:NORMAL);
 223                         break;
 224                 }
 225         }
 226
 227 }
 228
 229 void quit (void) {
 230         screen_setup(0);
 231         free_field ();
 232 }
 233
 234 /* I haven't won as long as a cell exists, that
 235     - I haven't opened, and
 236     - is not a mine */
 237 int everything_opened (void) {
 238         for (int row = 0; row < f.h; row++)
 239                 for (int col = 0; col < f.w; col++)
 240                         if (f.c[row][col].o == CLOSED &&
 241                             f.c[row][col].m == NO_MINE  ) return 0;
 242         return 1;
 243 }
 244
 245 int wait_mouse_up (int l, int c) {
 246         unsigned char mouse2[3];
 247         int level = 1;
 248         int l2, c2;
 249
 250         /* show :o face */
 251         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 252
 253         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 254                 /* show a pushed-in button if cursor is on minefield */
 255                 redraw_cell (l, c, HIGHLIGHT);
 256
 257                 show_stomp(1, l, c);
 258         }
 259
 260         while (level > 0) {
 261                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 262                         /* ignore mouse wheel events: */
 263                         if (mouse2[0] & 0x40) continue;
 264
 265                         else if((mouse2[0]&3) == 3) level--; /* release event */
 266                         else level++; /* another button pressed */
 267                 }
 268         }
 269
 270         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 271
 272         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 273                 redraw_cell (l, c, g.o?SHOWMINES:NORMAL);
 274                 show_stomp(0, l, c);
 275         }
 276         c2 = screen2field_c(mouse2[1]);
 277         l2 = screen2field_l(mouse2[2]);
 278         return ((l2 == l) && (c2 == c));
 279 }
 280
 281 int choord_square (int line, int col) {
 282         AROUND(line,col)
 283                 if (AR_CELL.f != FLAG) {
 284                         if (uncover_square (ROW, COL))
 285                                  return 1;
 286                 }
 287
 288         return 0;
 289 }
 290
 291 int choord_around(int row, int col) {
 292         AROUND(g.p[0], g.p[1]) {
 293                 if (AR_CELL.o == OPENED && get_neighbours (ROW, COL, 1) == 0) {
 294                         if (choord_square (ROW, COL)) return GAME_LOST;
 295                 }
 296         }
 297         return GAME_INPROGRESS;
 298 }
 299
 300 int uncover_square (int l, int c) {
 301         if (f.c[l][c].o == OPENED)
 302                 return 0; /* nothing to do */
 303
 304         f.c[l][c].o = OPENED;
 305         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 306         redraw_cell (l, c, NORMAL);
 307
 308         if (f.c[l][c].m) {
 309                 f.c[l][c].m = DEATH_MINE;
 310                 return 1;
 311         }
 312
 313         /* check for chording */
 314         if (f.c[l][c].n == 0) {
 315                 AROUND(l, c)
 316                         if (uncover_square (ROW, COL)) return 1;
 317         }
 318
 319         return 0;
 320 }
 321
 322 void flag_square (int l, int c) {
 323         static char modechar[] = {'*', '!', '?'};
 324
 325         if (f.c[l][c].o != CLOSED) return;
 326         /* cycle through flag/quesm/noflag: */
 327         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 328         if (f.c[l][c].f==FLAG) g.f++;
 329         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 330                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 331         redraw_cell (l, c, NORMAL);
 332         move_ph (1, op.scheme->cell_width);
 333         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 334 }
 335
 336 void quesm_square (int l, int c) {
 337         /* toggle question mark / none. won't turn flags into question marks.
 338         unlike flag_square, this function doesn't respect `-q'. */
 339         if      (f.c[l][c].o != CLOSED) return;
 340         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 341         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 342         redraw_cell (l, c, NORMAL);
 343 }
 344
 345 int do_uncover (int* is_newgame, int actor) {
 346         if (*is_newgame == GAME_NEW) {
 347                 *is_newgame = GAME_INPROGRESS;
 348                 fill_minefield (g.p[0], g.p[1]);
 349                 timer_setup(1);
 350         }
 351
 352         if (HI_CELL.f == FLAG  ) return GAME_INPROGRESS; //TODO: could choord?
 353         if (HI_CELL.o == CLOSED) {
 354                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 355         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 356                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 357         } else if (actor != MOUSE) {
 358                 show_stomp(1, g.p[0], g.p[1]);
 359
 360                 wait_stomp();
 361
 362                 show_stomp(0, g.p[0], g.p[1]);
 363         }
 364         if (everything_opened()) return GAME_WON;
 365
 366         return GAME_INPROGRESS;
 367 }
 368
 369 int ex_cmd(void) {
 370         char what[256];
 371         printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 372         PAUSE_TIMER { /* timer spams ASCII STX (0x02) chars */
 373                 move_ph(LINE_BELOW, 0);
 374                 putchar(':'); /* prompt */
 375
 376                 raw_mode(0);/*use cooked mode, so we get line editing for free*/
 377                 fgets(what, 256, stdin); //TODO: cancel on ^G, ESC, ^C, ...
 378                 raw_mode(1);
 379
 380                 move_ph(LINE_BELOW, 0);
 381                 printf ("\033[0J"); /* clear to the end of the screen */
 382         }
 383         printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 384
 385         switch (what[0]) { //TODO: urgh.
 386         case 'q': return EX_QUIT;
 387         case 'h': return EX_HELP;
 388         case 'r': return EX_RESZ;
 389         default:  return EX_INVALID;
 390         }
 391 }
 392 void set_mark(void) {
 393         int mark = tolower(getch_wrapper());
 394         if (mark < 'a' || mark > 'z') return; /*out of bound*/
 395
 396         g.m[mark-'a'].l = g.p[0];
 397         g.m[mark-'a'].c = g.p[1];
 398         g.m[mark-'a'].s = 1;
 399 }
 400
 401 void jump_mark(void) {
 402         int mark = tolower(getch_wrapper());
 403         /* check bounds and if set: */
 404         if (mark < 'a' || mark > 'z' || !g.m[mark-'a'].s) return;
 405         move_hi (g.m[mark-'a'].l, g.m[mark-'a'].c);
 406 }
 407
 408 void fill_minefield (int l, int c) {
 409         srand (time(0));
 410         int mines_set = f.m;
 411         while (mines_set) {
 412                 int line = rand() % f.h;
 413                 int col = rand() % f.w;
 414
 415                 if (f.c[line][col].m) {
 416                 /* skip if field already has a mine */
 417                         continue;
 418                 } else if ((line == l) && (col == c)) {
 419                 /* don't put a mine on the already opened (first click) field */
 420                         continue;
 421                 } else {
 422                         mines_set--;
 423                         f.c[line][col].m = STD_MINE;
 424                 }
 425         }
 426
 427         /* precalculate neighbours */
 428         for (int l=0; l < f.h; l++)
 429                 for (int c=0; c < f.w; c++)
 430                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 431 }
 432
 433 void move_ph (int line, int col) {
 434         /* move printhead to zero-indexed position */
 435         printf ("\033[%d;%dH", line+1, col+1);
 436 }
 437
 438 void move_hi (int l, int c) {
 439         /* move cursor and highlight to absolute coordinates */
 440
 441         redraw_cell (g.p[0], g.p[1], NORMAL);
 442         /* update g.p */
 443         g.p[0] = CLAMP(l, 0, f.h-1);
 444         g.p[1] = CLAMP(c, 0, f.w-1);
 445         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 446
 447         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 448 }
 449
 450 /* to_next_boundary(): move into the supplied direction until a change in open-
 451 state or flag-state is found and move there. falls back to BIG_MOVE. */
 452 #define FIND_BOUND(X, L, C, L1, C1, MAX, OP) do {\
 453         new_ ## X OP ## = BIG_MOVE;\
 454         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 455                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 456                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 457                         new_ ## X = i OP advance;\
 458                         break;\
 459                 }\
 460         } while(0)
 461 void to_next_boundary (int l, int c, char direction, int advance) {
 462         int new_l = l;
 463         int new_c = c;
 464         switch (direction) {
 465         case '>': FIND_BOUND(c, l, i, l, i+1, w, +); break;
 466         case '<': FIND_BOUND(c, l, i, l, i-1, w, -); break;
 467         case '^': FIND_BOUND(l, i, c, i-1, c, h, -); break;
 468         case 'v': FIND_BOUND(l, i, c, i+1, c, h, +); break;
 469         }
 470
 471         move_hi (new_l, new_c);
 472 }
 473 #undef FIND_BOUND
 474
 475 #define CELL f.c[g.p[0]][c]
 476 #define FIND_NEXT(CONDITION, DIRECTION) do {\
 477         int plusminus = DIRECTION-'='; /* -1 if '<', 1 if '>' */ \
 478         for (int c = g.p[1]+plusminus; c >= 0 && c < f.w; c+=plusminus) \
 479                 if (CONDITION) { \
 480                         move_hi (g.p[0], c+(till_after*plusminus)); \
 481                         return 1; /* NOTE: break didn't work */ \
 482                 } \
 483                 return 0; \
 484         } while(0)
 485 int find (int what, char direction, int till_after) {
 486         switch (what) {
 487         case ' ': what = '0'; /* fallthrough */
 488         case '0': case '1': case '2':
 489         case '3': case '4': case '5':
 490         case '6': case '7': case '8': /* numbers, opened */
 491                             FIND_NEXT(CELL.o && CELL.n == what-'0', direction);
 492         case 'o':           FIND_NEXT(CELL.o, direction);       /* any opened */
 493         case 'c':           FIND_NEXT(!CELL.o, direction);      /* any closed */
 494         case 'f': case 'i': FIND_NEXT(CELL.f==FLAG, direction); /* is flagged */
 495         case 'q': case '?': FIND_NEXT(CELL.f==QUESM, direction);/* questioned */
 496         }
 497
 498         return 0;
 499 }
 500 #undef FIND_NEXT
 501 #undef CELL
 502
 503 char* cell2schema (int l, int c, int mode) {
 504         struct minecell cell = f.c[l][c];
 505
 506         if (mode == SHOWMINES) return (
 507                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 508                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 509                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 510                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 511                 cell.o == CLOSED          ? op.scheme->field_closed:
 512                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 513         else if (mode == SHOWFLAGS) return (
 514                 /* on win (everything opened, only correct flags left) */
 515                 cell.m == STD_MINE        ? op.scheme->field_flagged:
 516                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 517         else return (
 518                 cell.f == FLAG            ? op.scheme->field_flagged:
 519                 cell.f == QUESM           ? op.scheme->field_question:
 520                 cell.o == CLOSED          ? op.scheme->field_closed:
 521                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 522                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 523                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 524 }
 525
 526 void redraw_cell (int l, int c, int mode) {
 527         move_ph (l+LINE_OFFSET, field2screen_c(c));
 528         if (mode == HIGHLIGHT) printf ("\033[7m"); /* reverse video */
 529         print (cell2schema(l, c, mode));
 530         if (mode == HIGHLIGHT) printf ("\033[0m"); /* reset all */
 531 }
 532
 533 char* get_emoticon(void) {
 534         return g.o==GAME_WON ? EMOT(WON):
 535                g.o==GAME_LOST? EMOT(DEAD):
 536                 EMOT(SMILE);
 537 }
 538
 539 /* https://zserge.com/blog/c-for-loop-tricks.html */
 540 #define print_line(which) \
 541         for (int _break = (printf("%s", BORDER(which,LEFT)), 1); _break; \
 542                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 543 #define print_border(which, width) \
 544         print_line(which) printm (width, BORDER(which,MIDDLE))
 545 void show_minefield (int mode) {
 546         int dtime = difftime (time(NULL), g.t)*!!g.t;
 547         int half_spaces = f.w*op.scheme->cell_width/2;
 548         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 549         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 550         static char modechar[] = {'*', '!', '?'};
 551
 552         move_ph (0,0);
 553
 554         print_border(TOP, f.w);
 555         print_line(STATUS) {
 556                 printf("[%03d%c]%*s%s%*s[%03d]",
 557                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 558                   left_spaces,"", get_emoticon(), right_spaces,"",
 559                   /* [ */ dtime /* ] */);
 560         }
 561         print_border(DIVIDER, f.w);
 562         /* main body */
 563         for (int l = 0; l < f.h; l++) print_line(FIELD)
 564                 printm (f.w, cell2schema(l, _loop, mode));
 565         print_border(BOTTOM, f.w);
 566 }
 567
 568 void show_stomp (int enable, int l, int c) {
 569         if (enable) {
 570                 if (f.c[l][c].o == OPENED && get_neighbours (l, c, 1) != 0) {
 571                         /* show the stomp radius if we aren't fully flagged */
 572                         AROUND(l, c)
 573                                 if (AR_CELL.o == CLOSED && AR_CELL.f != FLAG)
 574                                         redraw_cell (ROW, COL, HIGHLIGHT);
 575                         fflush(stdout); /* won't display without */
 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                 move_ph(LINE_BELOW, 0);
 621                 printf("Resize Mode: Enter to set, Q to abort");
 622                 //TODO: need escape seq. to print lowercase in `-d' mode!
 623
 624                 free_field(); /* must free before resizing! */
 625                 switch (getctrlseq(buf)) {
 626                 case CTRSEQ_CURSOR_LEFT: case 'h': f.w--; break;
 627                 case CTRSEQ_CURSOR_DOWN: case 'j': f.h++; break;
 628                 case CTRSEQ_CURSOR_UP:   case 'k': f.h--; break;
 629                 case CTRSEQ_CURSOR_RIGHT:case 'l': f.w++; break;
 630                 case 'w': f.w+=BIG_MOVE; break;
 631                 case 'b': f.w-=BIG_MOVE; break;
 632                 case 'u': f.h-=BIG_MOVE; break;
 633                 case 'd': f.h+=BIG_MOVE; break;
 634                 case 0xa: return; /* enter */
 635                 case 'q': /* abort */
 636                         f.w = old_w;
 637                         f.h = old_h;
 638                         screen_setup(1);
 639                         return;
 640                 }
 641
 642                 clamp_fieldsize();
 643                 f.m = mines_percentage(f.w, f.h);
 644                 f.c = alloc_array (f.h, f.w);
 645         }
 646 }
 647
 648 struct minecell** alloc_array (int lines, int cols) {
 649         free_field (); /* NOTE: this feels like a hack :| */
 650         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 651         if (a == NULL) return NULL;
 652         for (int l = 0; l < lines; l++) {
 653                 a[l] = calloc (cols, sizeof(struct minecell));
 654                 if (a[l] == NULL) goto unalloc;
 655         }
 656
 657         return a;
 658 unalloc:
 659         for (int l = 0; l < lines; l++)
 660                 free (a[l]);
 661         return NULL;
 662 }
 663
 664 void free_field (void) {
 665         if (f.c == NULL) return;
 666         for (int l = 0; l < f.h; l++) {
 667                 free (f.c[l]);
 668         }
 669
 670         free (f.c);
 671         f.c = NULL;
 672 }
 673
 674 int screen2field_l (int l) {
 675         return (l-LINE_OFFSET) - 1;
 676 }
 677 int screen2field_c (int c) {
 678         /* this depends on the cell width and only works when it is 1 or 2. */
 679         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 680 }
 681 int field2screen_c (int c) {
 682         return (CW*c+COL_OFFSET - (CW%2));
 683 }
 684 int clicked_emoticon (unsigned char* mouse) {
 685         return (mouse[2] == LINE_OFFSET-1 && (
 686                 mouse[1] == f.w+COL_OFFSET ||
 687                 mouse[1] == f.w+COL_OFFSET+1));
 688 }
 689
 690 enum esc_states {
 691         START,
 692         ESC_SENT,
 693         CSI_SENT,
 694         MOUSE_EVENT,
 695 };
 696 int getctrlseq (unsigned char* buf) {
 697         int c;
 698         int state = START;
 699         int offset = 0x20; /* never sends control chars as data */
 700         while ((c = getchar()) != EOF) {
 701                 switch (state) {
 702                 case START:
 703                         switch (c) {
 704                         case '\033': state=ESC_SENT; break;
 705                         default: return c;
 706                         }
 707                         break;
 708                 case ESC_SENT:
 709                         switch (c) {
 710                         case '[': state=CSI_SENT; break;
 711                         default: return CTRSEQ_INVALID;
 712                         }
 713                         break;
 714                 case CSI_SENT:
 715                         switch (c) {
 716                         case 'A': return CTRSEQ_CURSOR_UP;
 717                         case 'B': return CTRSEQ_CURSOR_DOWN;
 718                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 719                         case 'D': return CTRSEQ_CURSOR_LEFT;
 720                         case 'M': state=MOUSE_EVENT; break;
 721                         default: return CTRSEQ_INVALID;
 722                         }
 723                         break;
 724                 case MOUSE_EVENT:
 725                         buf[0] = c - offset;
 726                         buf[1] = getchar() - offset;
 727                         buf[2] = getchar() - offset;
 728                         return CTRSEQ_MOUSE;
 729                 default:
 730                         return CTRSEQ_INVALID;
 731                 }
 732         }
 733         return 2;
 734 }
 735
 736 int getch(unsigned char* buf) {
 737 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 738 compatible with the ncurses implementation of same name */
 739         int action = getctrlseq(buf);
 740         int l, c;
 741         switch (action) {
 742         case CTRSEQ_MOUSE:
 743                 l = screen2field_l (buf[2]);
 744                 c = screen2field_c (buf[1]);
 745
 746                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 747                 int success = wait_mouse_up(l, c);
 748
 749                 /* mouse moved while pressed: */
 750                 if (!success) return CTRSEQ_INVALID;
 751
 752                 switch (buf[0]) {
 753                 case 0: return CTRSEQ_MOUSE_LEFT;
 754                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 755                 case 2: return CTRSEQ_MOUSE_RIGHT;
 756                 }
 757         }
 758
 759         return action;
 760 }
 761
 762 int getch_wrapper (void) {
 763         unsigned char mouse[3];
 764         int c;
 765         /*skip over ASCII_STX=0x02 that gets sent when returning from SIGALRM:*/
 766         while ( (c = getch(mouse)) == 0x02);
 767
 768         if (c == CTRSEQ_MOUSE_LEFT || c == CTRSEQ_MOUSE_RIGHT) {
 769                 if (clicked_emoticon(mouse))
 770                         return WRAPPER_EMOTICON;
 771
 772                 if (screen2field_c (mouse[1]) < 0
 773                  || screen2field_c (mouse[1]) >= f.w
 774                  || screen2field_l (mouse[2]) < 0
 775                  || screen2field_l (mouse[2]) >= f.h)
 776                         return CTRSEQ_INVALID;
 777
 778                 g.p[0] = screen2field_l (mouse[2]);
 779                 g.p[1] = screen2field_c (mouse[1]);
 780
 781                 return c; /* CTRSEQ_MOUSE_LEFT || CTRSEQ_MOUSE_RIGHT */
 782         }
 783
 784         return c;
 785 }
 786
 787 void clamp_fieldsize (void) {
 788         /* clamp field size to terminal size and mouse maximum: */
 789         struct winsize w;
 790         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 791
 792         /* seven is the minimum width of the status bar */
 793         if (f.w < 7) f.w = 7;
 794         if (f.h < 7) f.h = 7;
 795
 796         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 797                 f.w = (w.ws_col - COL_OFFSET - COL_OFFSET)/DW;
 798         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 799                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 800         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 801                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 802         if (LINE_OFFSET + f.h > MOUSE_MAX)
 803                 f.h = MOUSE_MAX - LINE_OFFSET;
 804 }
 805
 806 int mines_percentage(int w, int h) {
 807         return w*h*(w*h<30*16?.15625:.20625);
 808 }
 809
 810 int parse_fieldspec(char* str) {
 811         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 812         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 813
 814         clamp_fieldsize();
 815
 816         if (n < 2) {
 817                 return 1; /* error */
 818         } else if (n == 2) {
 819                 f.m = mines_percentage(f.w, f.h);
 820         }
 821
 822         f.m = MIN(f.m, (f.w-1) * (f.h-1)); /* limit mines */
 823
 824         return 0;
 825 }
 826
 827 void timer_setup (int enable) {
 828         static struct itimerval tbuf;
 829         tbuf.it_interval.tv_sec  = 1;
 830         tbuf.it_interval.tv_usec = 0;
 831
 832         if (enable) {
 833                 g.t = time(NULL);
 834                 tbuf.it_value.tv_sec  = 1;
 835                 tbuf.it_value.tv_usec = 0;
 836                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 837                         perror("setitimer");
 838                         exit(1);
 839                 }
 840         } else {
 841                 tbuf.it_value.tv_sec  = 0;
 842                 tbuf.it_value.tv_usec = 0;
 843                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 844                         perror("setitimer");
 845                         exit(1);
 846                 }
 847         }
 848
 849 }
 850
 851 void signal_setup (void) {
 852         struct sigaction saction;
 853
 854         saction.sa_handler = signal_handler;
 855         sigemptyset(&saction.sa_mask);
 856         saction.sa_flags   = 0;
 857         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 858                 perror("SIGALRM");
 859                 exit(1);
 860         }
 861
 862         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 863                 perror ("SIGINT");
 864                 exit (1);
 865         }
 866 }
 867
 868 void signal_handler (int signum) {
 869         int dtime;
 870         switch (signum) {
 871         case SIGALRM:
 872                 dtime = difftime (time(NULL), g.t);
 873                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 874                 printf ("[%03d]", g.t?dtime:0);
 875                 break;
 876         case SIGINT:
 877                 exit(128+SIGINT);
 878         }
 879 }
 880
 881 void screen_setup (int enable) {
 882         if (enable) {
 883                 raw_mode(1);
 884                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 885                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 886                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 887                 print (op.scheme->init_seq); /* swich charset, if necessary */
 888         } else {
 889                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 890                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 891                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 892                 raw_mode(0);
 893         }
 894 }
 895
 896 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 897 void raw_mode(int enable) {
 898         static struct termios saved_term_mode;
 899         struct termios raw_term_mode;
 900
 901         if (enable) {
 902                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 903                 raw_term_mode = saved_term_mode;
 904                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 905                 raw_term_mode.c_cc[VMIN] = 1 ;
 906                 raw_term_mode.c_cc[VTIME] = 0;
 907                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 908         } else {
 909                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 910         }
 911 }