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                 //TODO: HJKL, ^H^J^K^L: <spacemode> up/down/left/right/45deg
 196                 case WRAPPER_EMOTICON:
 197                 case 'r': timer_setup(0); return GAME_NEW;
 198                 case ':':
 199                         switch (ex_cmd()) {
 200                         case EX_QUIT: return GAME_QUIT;
 201                         case EX_HELP: printf (KEYHELP); break;
 202                         case EX_RESZ:
 203                                 timer_setup(0);
 204                                 interactive_resize();
 205                                 return GAME_NEW;
 206                         default:
 207                                 printf ("\rinvalid command");
 208                                 PAUSE_TIMER ungetc(getchar(), stdin);
 209                                 printf("\033[2K"); /* clear line */
 210                         }
 211                         break;
 212                 case 'q': //TODO: redefine `q' as macro functionality
 213                         break;
 214                 case CTRL_'L':
 215                         screen_setup(1);
 216                         show_minefield (NORMAL);
 217                         break;
 218                 case '\\':
 219                         if (g.n == GAME_NEW) break; /* must open a cell first */
 220                         g.c = !g.c;
 221                         show_minefield (g.c?SHOWMINES:NORMAL);
 222                         break;
 223                 }
 224         }
 225
 226 }
 227
 228 void quit (void) {
 229         screen_setup(0);
 230         free_field ();
 231 }
 232
 233 /* I haven't won as long as a cell exists, that
 234     - I haven't opened, and
 235     - is not a mine */
 236 int everything_opened (void) {
 237         for (int row = 0; row < f.h; row++)
 238                 for (int col = 0; col < f.w; col++)
 239                         if (f.c[row][col].o == CLOSED &&
 240                             f.c[row][col].m == NO_MINE  ) return 0;
 241         return 1;
 242 }
 243
 244 int wait_mouse_up (int l, int c) {
 245         unsigned char mouse2[3];
 246         int level = 1;
 247         int l2, c2;
 248
 249         /* show :o face */
 250         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 251
 252         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 253                 /* show a pushed-in button if cursor is on minefield */
 254                 redraw_cell (l, c, HIGHLIGHT);
 255
 256                 show_stomp(1, l, c);
 257         }
 258
 259         while (level > 0) {
 260                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 261                         /* ignore mouse wheel events: */
 262                         if (mouse2[0] & 0x40) continue;
 263
 264                         else if((mouse2[0]&3) == 3) level--; /* release event */
 265                         else level++; /* another button pressed */
 266                 }
 267         }
 268
 269         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 270
 271         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 272                 redraw_cell (l, c, g.o?SHOWMINES:NORMAL);
 273                 show_stomp(0, l, c);
 274         }
 275         c2 = screen2field_c(mouse2[1]);
 276         l2 = screen2field_l(mouse2[2]);
 277         return ((l2 == l) && (c2 == c));
 278 }
 279
 280 int choord_square (int line, int col) {
 281         if (uncover_square (line, col)) return 1;
 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 uncover_square (int l, int c) {
 292         if (f.c[l][c].o == OPENED)
 293                 return 0; /* nothing to do */
 294
 295         f.c[l][c].o = OPENED;
 296         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 297         redraw_cell (l, c, NORMAL);
 298
 299         if (f.c[l][c].m) {
 300                 f.c[l][c].m = DEATH_MINE;
 301                 return 1;
 302         }
 303
 304         /* check for chording */
 305         if (f.c[l][c].n == 0) {
 306                 AROUND(l, c)
 307                         if (uncover_square (ROW, COL)) return 1;
 308         }
 309
 310         return 0;
 311 }
 312
 313 void flag_square (int l, int c) {
 314         static char modechar[] = {'*', '!', '?'};
 315
 316         if (f.c[l][c].o != CLOSED) return;
 317         /* cycle through flag/quesm/noflag: */
 318         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 319         if (f.c[l][c].f==FLAG) g.f++;
 320         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 321                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 322         redraw_cell (l, c, NORMAL);
 323         move_ph (1, op.scheme->cell_width);
 324         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 325 }
 326
 327 void quesm_square (int l, int c) {
 328         /* toggle question mark / none. won't turn flags into question marks.
 329         unlike flag_square, this function doesn't respect `-q'. */
 330         if      (f.c[l][c].o != CLOSED) return;
 331         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 332         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 333         redraw_cell (l, c, NORMAL);
 334 }
 335
 336 int do_uncover (int* is_newgame, int actor) {
 337         if (*is_newgame == GAME_NEW) {
 338                 *is_newgame = GAME_INPROGRESS;
 339                 fill_minefield (g.p[0], g.p[1]);
 340                 timer_setup(1);
 341         }
 342
 343         if (HI_CELL.f == FLAG  ) return GAME_INPROGRESS;
 344         if (HI_CELL.o == CLOSED) {
 345                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 346         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 347                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 348         } else if (actor != MOUSE) {
 349                 show_stomp(1, g.p[0], g.p[1]);
 350
 351                 wait_stomp();
 352
 353                 show_stomp(0, g.p[0], g.p[1]);
 354         }
 355         if (everything_opened()) return GAME_WON;
 356
 357         return GAME_INPROGRESS;
 358 }
 359
 360 int ex_cmd(void) {
 361         char what[256];
 362         printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 363         PAUSE_TIMER { /* timer spams ASCII STX (0x02) chars */
 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                 fgets(what, 256, stdin); //TODO: cancel on ^G, ESC, ^C, ...
 369                 raw_mode(1);
 370
 371                 move_ph(LINE_BELOW, 0);
 372                 printf ("\033[0J"); /* clear to the end of the screen */
 373         }
 374         printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 375
 376         switch (what[0]) { //TODO: urgh.
 377         case 'q': return EX_QUIT;
 378         case 'h': return EX_HELP;
 379         case 'r': return EX_RESZ;
 380         default:  return EX_INVALID;
 381         }
 382 }
 383 void set_mark(void) {
 384         int mark = tolower(getch_wrapper());
 385         if (mark < 'a' || mark > 'z') return; /*out of bound*/
 386
 387         g.m[mark-'a'].l = g.p[0];
 388         g.m[mark-'a'].c = g.p[1];
 389         g.m[mark-'a'].s = 1;
 390 }
 391
 392 void jump_mark(void) {
 393         int mark = tolower(getch_wrapper());
 394         /* check bounds and if set: */
 395         if (mark < 'a' || mark > 'z' || !g.m[mark-'a'].s) return;
 396         move_hi (g.m[mark-'a'].l, g.m[mark-'a'].c);
 397 }
 398
 399 void fill_minefield (int l, int c) {
 400         srand (time(0));
 401         int mines_set = f.m;
 402         while (mines_set) {
 403                 int line = rand() % f.h;
 404                 int col = rand() % f.w;
 405
 406                 if (f.c[line][col].m) {
 407                 /* skip if field already has a mine */
 408                         continue;
 409                 } else if ((line == l) && (col == c)) {
 410                 /* don't put a mine on the already opened (first click) field */
 411                         continue;
 412                 } else {
 413                         mines_set--;
 414                         f.c[line][col].m = STD_MINE;
 415                 }
 416         }
 417
 418         /* precalculate neighbours */
 419         for (int l=0; l < f.h; l++)
 420                 for (int c=0; c < f.w; c++)
 421                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 422 }
 423
 424 void move_ph (int line, int col) {
 425         /* move printhead to zero-indexed position */
 426         printf ("\033[%d;%dH", line+1, col+1);
 427 }
 428
 429 void move_hi (int l, int c) {
 430         /* move cursor and highlight to absolute coordinates */
 431
 432         redraw_cell (g.p[0], g.p[1], NORMAL);
 433         /* update g.p */
 434         g.p[0] = CLAMP(l, 0, f.h-1);
 435         g.p[1] = CLAMP(c, 0, f.w-1);
 436         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 437
 438         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 439 }
 440
 441 /* to_next_boundary(): move into the supplied direction until a change in open-
 442 state or flag-state is found and move there. falls back to BIG_MOVE. */
 443 #define FIND_BOUND(X, L, C, L1, C1, MAX, OP) do {\
 444         new_ ## X OP ## = BIG_MOVE;\
 445         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 446                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 447                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 448                         new_ ## X = i OP advance;\
 449                         break;\
 450                 }\
 451         } while(0)
 452 void to_next_boundary (int l, int c, char direction, int advance) {
 453         int new_l = l;
 454         int new_c = c;
 455         switch (direction) {
 456         case '>': FIND_BOUND(c, l, i, l, i+1, w, +); break;
 457         case '<': FIND_BOUND(c, l, i, l, i-1, w, -); break;
 458         case '^': FIND_BOUND(l, i, c, i-1, c, h, -); break;
 459         case 'v': FIND_BOUND(l, i, c, i+1, c, h, +); break;
 460         }
 461
 462         move_hi (new_l, new_c);
 463 }
 464 #undef FIND_BOUND
 465
 466 #define CELL f.c[g.p[0]][c]
 467 #define FIND_NEXT(CONDITION, DIRECTION) do {\
 468         int plusminus = DIRECTION-'='; /* -1 if '<', 1 if '>' */ \
 469         for (int c = g.p[1]+plusminus; c >= 0 && c < f.w; c+=plusminus) \
 470                 if (CONDITION) { \
 471                         move_hi (g.p[0], c+(till_after*plusminus)); \
 472                         return 1; /* NOTE: break didn't work */ \
 473                 } \
 474                 return 0; \
 475         } while(0)
 476 int find (int what, char direction, int till_after) {
 477         switch (what) {
 478         case ' ': what = '0'; /* fallthrough */
 479         case '0': case '1': case '2':
 480         case '3': case '4': case '5':
 481         case '6': case '7': case '8': /* numbers, opened */
 482                             FIND_NEXT(CELL.o && CELL.n == what-'0', direction);
 483         case 'o':           FIND_NEXT(CELL.o, direction);       /* any opened */
 484         case 'c':           FIND_NEXT(!CELL.o, direction);      /* any closed */
 485         case 'f': case 'i': FIND_NEXT(CELL.f==FLAG, direction); /* is flagged */
 486         case 'q': case '?': FIND_NEXT(CELL.f==QUESM, direction);/* questioned */
 487         }
 488
 489         return 0;
 490 }
 491 #undef FIND_NEXT
 492 #undef CELL
 493
 494 char* cell2schema (int l, int c, int mode) {
 495         struct minecell cell = f.c[l][c];
 496
 497         if (mode == SHOWMINES) return (
 498                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 499                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 500                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 501                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 502                 cell.o == CLOSED          ? op.scheme->field_closed:
 503                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 504         else if (mode == SHOWFLAGS) return (
 505                 /* on win (everything opened, only correct flags left) */
 506                 cell.m == STD_MINE        ? op.scheme->field_flagged:
 507                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 508         else return (
 509                 cell.f == FLAG            ? op.scheme->field_flagged:
 510                 cell.f == QUESM           ? op.scheme->field_question:
 511                 cell.o == CLOSED          ? op.scheme->field_closed:
 512                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 513                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 514                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 515 }
 516
 517 void redraw_cell (int l, int c, int mode) {
 518         move_ph (l+LINE_OFFSET, field2screen_c(c));
 519         if (mode == HIGHLIGHT) printf ("\033[7m"); /* reverse video */
 520         print (cell2schema(l, c, mode));
 521         if (mode == HIGHLIGHT) printf ("\033[0m"); /* reset all */
 522 }
 523
 524 char* get_emoticon(void) {
 525         return g.o==GAME_WON ? EMOT(WON):
 526                g.o==GAME_LOST? EMOT(DEAD):
 527                 EMOT(SMILE);
 528 }
 529
 530 /* https://zserge.com/blog/c-for-loop-tricks.html */
 531 #define print_line(which) \
 532         for (int _break = (printf("%s", BORDER(which,LEFT)), 1); _break; \
 533                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 534 #define print_border(which, width) \
 535         print_line(which) printm (width, BORDER(which,MIDDLE))
 536 void show_minefield (int mode) {
 537         int dtime = difftime (time(NULL), g.t)*!!g.t;
 538         int half_spaces = f.w*op.scheme->cell_width/2;
 539         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 540         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 541         static char modechar[] = {'*', '!', '?'};
 542
 543         move_ph (0,0);
 544
 545         print_border(TOP, f.w);
 546         print_line(STATUS) {
 547                 printf("[%03d%c]%*s%s%*s[%03d]",
 548                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 549                   left_spaces,"", get_emoticon(), right_spaces,"",
 550                   /* [ */ dtime /* ] */);
 551         }
 552         print_border(DIVIDER, f.w);
 553         /* main body */
 554         for (int l = 0; l < f.h; l++) print_line(FIELD)
 555                 printm (f.w, cell2schema(l, _loop, mode));
 556         print_border(BOTTOM, f.w);
 557 }
 558
 559 void show_stomp (int enable, int l, int c) {
 560         if (enable) {
 561                 if (f.c[l][c].o == OPENED && get_neighbours (l, c, 1) != 0) {
 562                         /* show the stomp radius if we aren't fully flagged */
 563                         AROUND(l, c)
 564                                 if (AR_CELL.o == CLOSED && AR_CELL.f != FLAG)
 565                                         redraw_cell (ROW, COL, HIGHLIGHT);
 566                         fflush(stdout); /* won't display without */
 567                 }
 568         } else {
 569                 AROUND(l, c) redraw_cell (ROW, COL, g.o?SHOWMINES:NORMAL);
 570         }
 571 }
 572
 573 void wait_stomp (void) {
 574         /* block SIGALRM, otherwise poll gets cancelled by the timer: */
 575         sigset_t sig;
 576         sigemptyset (&sig);
 577         sigaddset(&sig, SIGALRM);
 578         sigprocmask (SIG_BLOCK, &sig, NULL);
 579
 580         /* wait for timout or keypress: */
 581         struct pollfd fds;
 582         fds.fd = 0; fds.events = POLLIN;
 583         poll(&fds, 1, STOMP_TIMEOUT);
 584
 585         /* restore signal mask: */
 586         sigprocmask (SIG_UNBLOCK, &sig, NULL);
 587 }
 588
 589 int get_neighbours (int line, int col, int reduced_mode) {
 590         /* counts mines surrounding a square
 591            modes: 0=normal; 1=reduced */
 592
 593         int count = 0;
 594         AROUND(line, col) {
 595                 count += !!AR_CELL.m;
 596                 count -= reduced_mode * AR_CELL.f==FLAG;
 597         }
 598         return count;
 599 }
 600
 601 void interactive_resize(void) {
 602         unsigned char buf[3];
 603         int old_w = f.w;
 604         int old_h = f.h;
 605         for(;;) {
 606                 screen_setup(1); /* clears the screen */
 607                 show_minefield (RESIZEMODE);
 608                 /* show the new field size in the corner: */
 609                 move_ph(f.h+LINE_OFFSET-1,COL_OFFSET);
 610                 printf("%d x %d", f.w, f.h);
 611                 move_ph(LINE_BELOW, 0);
 612                 printf("Resize Mode: Enter to set, Q to abort");
 613                 //TODO: need escape seq. to print lowercase in `-d' mode!
 614
 615                 free_field(); /* must free before resizing! */
 616                 switch (getctrlseq(buf)) {
 617                 case CTRSEQ_CURSOR_LEFT: case 'h': f.w--; break;
 618                 case CTRSEQ_CURSOR_DOWN: case 'j': f.h++; break;
 619                 case CTRSEQ_CURSOR_UP:   case 'k': f.h--; break;
 620                 case CTRSEQ_CURSOR_RIGHT:case 'l': f.w++; break;
 621                 case 'w': f.w+=BIG_MOVE; break;
 622                 case 'b': f.w-=BIG_MOVE; break;
 623                 case 'u': f.h-=BIG_MOVE; break;
 624                 case 'd': f.h+=BIG_MOVE; break;
 625                 case 0xa: return; /* enter */
 626                 case 'q': /* abort */
 627                         f.w = old_w;
 628                         f.h = old_h;
 629                         screen_setup(1);
 630                         return;
 631                 }
 632
 633                 clamp_fieldsize();
 634                 f.m = mines_percentage(f.w, f.h);
 635                 f.c = alloc_array (f.h, f.w);
 636         }
 637 }
 638
 639 struct minecell** alloc_array (int lines, int cols) {
 640         free_field (); /* NOTE: this feels like a hack :| */
 641         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 642         if (a == NULL) return NULL;
 643         for (int l = 0; l < lines; l++) {
 644                 a[l] = calloc (cols, sizeof(struct minecell));
 645                 if (a[l] == NULL) goto unalloc;
 646         }
 647
 648         return a;
 649 unalloc:
 650         for (int l = 0; l < lines; l++)
 651                 free (a[l]);
 652         return NULL;
 653 }
 654
 655 void free_field (void) {
 656         if (f.c == NULL) return;
 657         for (int l = 0; l < f.h; l++) {
 658                 free (f.c[l]);
 659         }
 660
 661         free (f.c);
 662         f.c = NULL;
 663 }
 664
 665 int screen2field_l (int l) {
 666         return (l-LINE_OFFSET) - 1;
 667 }
 668 int screen2field_c (int c) {
 669         /* this depends on the cell width and only works when it is 1 or 2. */
 670         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 671 }
 672 int field2screen_c (int c) {
 673         return (CW*c+COL_OFFSET - (CW%2));
 674 }
 675 int clicked_emoticon (unsigned char* mouse) {
 676         return (mouse[2] == LINE_OFFSET-1 && (
 677                 mouse[1] == f.w+COL_OFFSET ||
 678                 mouse[1] == f.w+COL_OFFSET+1));
 679 }
 680
 681 enum esc_states {
 682         START,
 683         ESC_SENT,
 684         CSI_SENT,
 685         MOUSE_EVENT,
 686 };
 687 int getctrlseq (unsigned char* buf) {
 688         int c;
 689         int state = START;
 690         int offset = 0x20; /* never sends control chars as data */
 691         while ((c = getchar()) != EOF) {
 692                 switch (state) {
 693                 case START:
 694                         switch (c) {
 695                         case '\033': state=ESC_SENT; break;
 696                         default: return c;
 697                         }
 698                         break;
 699                 case ESC_SENT:
 700                         switch (c) {
 701                         case '[': state=CSI_SENT; break;
 702                         default: return CTRSEQ_INVALID;
 703                         }
 704                         break;
 705                 case CSI_SENT:
 706                         switch (c) {
 707                         case 'A': return CTRSEQ_CURSOR_UP;
 708                         case 'B': return CTRSEQ_CURSOR_DOWN;
 709                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 710                         case 'D': return CTRSEQ_CURSOR_LEFT;
 711                         case 'M': state=MOUSE_EVENT; break;
 712                         default: return CTRSEQ_INVALID;
 713                         }
 714                         break;
 715                 case MOUSE_EVENT:
 716                         buf[0] = c - offset;
 717                         buf[1] = getchar() - offset;
 718                         buf[2] = getchar() - offset;
 719                         return CTRSEQ_MOUSE;
 720                 default:
 721                         return CTRSEQ_INVALID;
 722                 }
 723         }
 724         return 2;
 725 }
 726
 727 int getch(unsigned char* buf) {
 728 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 729 compatible with the ncurses implementation of same name */
 730         int action = getctrlseq(buf);
 731         int l, c;
 732         switch (action) {
 733         case CTRSEQ_MOUSE:
 734                 l = screen2field_l (buf[2]);
 735                 c = screen2field_c (buf[1]);
 736
 737                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 738                 int success = wait_mouse_up(l, c);
 739
 740                 /* mouse moved while pressed: */
 741                 if (!success) return CTRSEQ_INVALID;
 742
 743                 switch (buf[0]) {
 744                 case 0: return CTRSEQ_MOUSE_LEFT;
 745                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 746                 case 2: return CTRSEQ_MOUSE_RIGHT;
 747                 }
 748         }
 749
 750         return action;
 751 }
 752
 753 int getch_wrapper (void) {
 754         unsigned char mouse[3];
 755         int c;
 756         /*skip over ASCII_STX=0x02 that gets sent when returning from SIGALRM:*/
 757         while ( (c = getch(mouse)) == 0x02);
 758
 759         if (c == CTRSEQ_MOUSE_LEFT || c == CTRSEQ_MOUSE_RIGHT) {
 760                 if (clicked_emoticon(mouse))
 761                         return WRAPPER_EMOTICON;
 762
 763                 if (screen2field_c (mouse[1]) < 0
 764                  || screen2field_c (mouse[1]) >= f.w
 765                  || screen2field_l (mouse[2]) < 0
 766                  || screen2field_l (mouse[2]) >= f.h)
 767                         return CTRSEQ_INVALID;
 768
 769                 g.p[0] = screen2field_l (mouse[2]);
 770                 g.p[1] = screen2field_c (mouse[1]);
 771
 772                 return c; /* CTRSEQ_MOUSE_LEFT || CTRSEQ_MOUSE_RIGHT */
 773         }
 774
 775         return c;
 776 }
 777
 778 void clamp_fieldsize (void) {
 779         /* clamp field size to terminal size and mouse maximum: */
 780         struct winsize w;
 781         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 782
 783         /* seven is the minimum width of the status bar */
 784         if (f.w < 7) f.w = 7;
 785         if (f.h < 7) f.h = 7;
 786
 787         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 788                 f.w = (w.ws_col - COL_OFFSET - COL_OFFSET)/DW;
 789         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 790                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 791         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 792                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 793         if (LINE_OFFSET + f.h > MOUSE_MAX)
 794                 f.h = MOUSE_MAX - LINE_OFFSET;
 795 }
 796
 797 int mines_percentage(int w, int h) {
 798         return w*h*(w*h<30*16?.15625:.20625);
 799 }
 800
 801 int parse_fieldspec(char* str) {
 802         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 803         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 804
 805         clamp_fieldsize();
 806
 807         if (n < 2) {
 808                 return 1; /* error */
 809         } else if (n == 2) {
 810                 f.m = mines_percentage(f.w, f.h);
 811         }
 812
 813         f.m = MIN(f.m, (f.w-1) * (f.h-1)); /* limit mines */
 814
 815         return 0;
 816 }
 817
 818 void timer_setup (int enable) {
 819         static struct itimerval tbuf;
 820         tbuf.it_interval.tv_sec  = 1;
 821         tbuf.it_interval.tv_usec = 0;
 822
 823         if (enable) {
 824                 g.t = time(NULL);
 825                 tbuf.it_value.tv_sec  = 1;
 826                 tbuf.it_value.tv_usec = 0;
 827                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 828                         perror("setitimer");
 829                         exit(1);
 830                 }
 831         } else {
 832                 tbuf.it_value.tv_sec  = 0;
 833                 tbuf.it_value.tv_usec = 0;
 834                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 835                         perror("setitimer");
 836                         exit(1);
 837                 }
 838         }
 839
 840 }
 841
 842 void signal_setup (void) {
 843         struct sigaction saction;
 844
 845         saction.sa_handler = signal_handler;
 846         sigemptyset(&saction.sa_mask);
 847         saction.sa_flags   = 0;
 848         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 849                 perror("SIGALRM");
 850                 exit(1);
 851         }
 852
 853         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 854                 perror ("SIGINT");
 855                 exit (1);
 856         }
 857 }
 858
 859 void signal_handler (int signum) {
 860         int dtime;
 861         switch (signum) {
 862         case SIGALRM:
 863                 dtime = difftime (time(NULL), g.t);
 864                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 865                 printf ("[%03d]", g.t?dtime:0);
 866                 break;
 867         case SIGINT:
 868                 exit(128+SIGINT);
 869         }
 870 }
 871
 872 void screen_setup (int enable) {
 873         if (enable) {
 874                 raw_mode(1);
 875                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 876                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 877                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 878                 print (op.scheme->init_seq); /* swich charset, if necessary */
 879         } else {
 880                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 881                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 882                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 883                 raw_mode(0);
 884         }
 885 }
 886
 887 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 888 void raw_mode(int enable) {
 889         static struct termios saved_term_mode;
 890         struct termios raw_term_mode;
 891
 892         if (enable) {
 893                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 894                 raw_term_mode = saved_term_mode;
 895                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 896                 raw_term_mode.c_cc[VMIN] = 1 ;
 897                 raw_term_mode.c_cc[VTIME] = 0;
 898                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 899         } else {
 900                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 901         }
 902 }