mines_2017.c

   1 //TODO: segfault: click outside playfield, then use cursorkeys
   2 /*******************************************************************************
   3  minesviiper 0.3.1459
   4  By Tobias Girstmair, 2015 - 2018
   5
   6  ./minesviiper 16x16x40
   7  (see ./minesviiper -h for full list of options)
   8
   9  MOUSE MODE: - left click to open and choord
  10              - right click to flag/unflag
  11  VI MODE:    - hjkl to move cursor left/down/up/right
  12              - bduw to jump left/down/up/right by 5 cells
  13              - o to open and choord
  14              - i to flag/unflag
  15
  16  GNU GPL v3, see LICENSE or https://www.gnu.org/licenses/gpl-3.0.txt
  17 *******************************************************************************/
  18
  19
  20 #define _POSIX_C_SOURCE 2 /*for getopt, sigaction in c99*/
  21 #include <ctype.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 "schemes.h"
  32
  33 #define LINE_OFFSET 3
  34 #define COL_OFFSET 2
  35 #define BIG_MOVE 5
  36
  37 #define MIN(a,b) (a>b?b:a)
  38 #define MAX(a,b) (a>b?a:b)
  39 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
  40 #define printm(num, str) for (int i = 0; i < num; i++) fputs (str, stdout)
  41 #define print(str) fputs (str, stdout)
  42 #define EMOT(e) op.scheme->emoticons[EMOT_ ## e]
  43
  44 struct minecell {
  45         unsigned m:2; /* mine?1:killmine?2:0 */
  46         unsigned o:1; /* open?1:0 */
  47         unsigned f:2; /* flagged?1:questioned?2:0 */
  48         unsigned n:4; /* 0<= neighbours <=8 */
  49 };
  50 struct minefield {
  51         struct minecell **c;
  52         //TODO: rename w, h to L, C
  53         int w; /* width */
  54         int h; /* height */
  55         int m; /* number of mines */
  56
  57         int f; /* flags counter */
  58         int t; /* time of game start */
  59         int p[2]; /* cursor position {line, col} */
  60         int s; /* space mode */
  61 } f;
  62
  63 struct opt {
  64         struct minescheme* scheme;
  65         int mode; /* allow flags? quesm? */
  66 } op;
  67
  68 int alt_screen = 0;
  69 char* spaces = /* for formatstring in show_minefield(); mouse-max < this */
  70         "                                                                "
  71         "                                                                "
  72         "                                                                "
  73         "                                                                ";
  74
  75 struct line_col {
  76         int l;
  77         int c;
  78 };
  79
  80 void fill_minefield (int, int);
  81 void move (int, int);
  82 void cursor_move (int, int);
  83 void to_next_boundary (int l, int c, char direction);
  84 int getch (unsigned char*);
  85 int getctrlseq (unsigned char*);
  86 int everything_opened ();
  87 int wait_mouse_up (int, int);
  88 void partial_show_minefield (int, int, int);
  89 void show_minefield (int);
  90 int get_neighbours (int, int, int);
  91 int uncover_square (int, int);
  92 void flag_square (int, int);
  93 void quesm_square (int, int);
  94 int choord_square (int, int);
  95 int do_uncover (int*);
  96 struct minecell** alloc_array (int, int);
  97 void free_field ();
  98 int screen2field_l (int);
  99 int screen2field_c (int);
 100 int field2screen_l (int);
 101 int field2screen_c (int);
 102 void quit();
 103 void signal_handler (int signum);
 104 void timer_setup (int);
 105
 106 enum modes {
 107         NORMAL,
 108         REDUCED,
 109         SHOWMINES,
 110         HIGHLIGHT,
 111 };
 112 enum flagtypes {
 113         NOFLAG,
 114         FLAG,
 115         QUESM,
 116 };
 117 enum fieldopenstates {
 118         CLOSED,
 119         OPENED,
 120 };
 121 enum game_states {
 122         GAME_INPROGRESS,
 123         GAME_NEW,
 124         GAME_WON,
 125         GAME_LOST,
 126 };
 127 enum space_modes {
 128         MODE_OPEN,
 129         MODE_FLAG,
 130         MODE_QUESM,
 131 };
 132 enum event {
 133         /* for getctrlseq() */
 134         CTRSEQ_NULL    =  0,
 135         CTRSEQ_EOF     = -1,
 136         CTRSEQ_INVALID = -2,
 137         CTRSEQ_MOUSE   = -3,
 138         /* for getch() */
 139         CTRSEQ_MOUSE_LEFT   = -4,
 140         CTRSEQ_MOUSE_MIDDLE = -5,
 141         CTRSEQ_MOUSE_RIGHT  = -6,
 142 };
 143 enum mine_types {
 144         NO_MINE,
 145         STD_MINE,
 146         DEATH_MINE,
 147 };
 148
 149 void signal_handler (int signum) {
 150         int dtime;
 151         switch (signum) {
 152         case SIGALRM:
 153                 dtime = difftime (time(NULL), f.t);
 154                 move (1, f.w*op.scheme->cell_width-(op.scheme->cell_width%2)-3-(dtime>999));
 155                 printf ("[%03d]", f.t?dtime:0);
 156                 break;
 157         case SIGINT:
 158                 exit(128+SIGINT);
 159         }
 160 }
 161
 162 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 163 struct termios saved_term_mode;
 164 struct termios set_raw_term_mode() {
 165         struct termios cur_term_mode, raw_term_mode;
 166
 167         tcgetattr(STDIN_FILENO, &cur_term_mode);
 168         raw_term_mode = cur_term_mode;
 169         raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 170         raw_term_mode.c_cc[VMIN] = 1 ;
 171         raw_term_mode.c_cc[VTIME] = 0;
 172         tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 173
 174         return cur_term_mode;
 175 }
 176 void restore_term_mode(struct termios saved_term_mode) {
 177         tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 178 }
 179
 180
 181 int main (int argc, char** argv) {
 182         struct sigaction saction;
 183         saved_term_mode = set_raw_term_mode();
 184
 185         atexit (*quit);
 186
 187         saction.sa_handler = signal_handler;
 188         sigemptyset(&saction.sa_mask);
 189         saction.sa_flags   = 0;
 190         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 191                 perror("SIGALRM");
 192                 exit(1);
 193         }
 194
 195         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 196                 perror ("SIGINT");
 197                 exit (1);
 198         }
 199         /* end screen setup */
 200
 201         op.scheme = &symbols_mono;
 202         op.mode = FLAG;
 203         /* end defaults */
 204         /* parse options */
 205         int optget;
 206         opterr = 0; /* don't print message on unrecognized option */
 207         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
 208                 switch (optget) {
 209                 case 'n': op.mode    = NOFLAG; break;
 210                 case 'f': op.mode    = FLAG; break; /*default*/
 211                 case 'q': op.mode    = QUESM; break;
 212                 case 'c': op.scheme  = &symbols_col1; break;
 213                 case 'd': op.scheme  = &symbols_doublewidth; break;
 214                 case 'h':
 215                 default:
 216                         fprintf (stderr, "%s [OPTIONS] [FIELDSPEC]\n"
 217                         "OPTIONS:\n"
 218                         "    -n(o flagging)\n"
 219                         "    -f(lagging)\n"
 220                         "    -q(uestion marks)\n"
 221                         "    -c(olored symbols)\n"
 222                         "    -d(ec charset symbols)\n"
 223                         "FIELDSPEC:\n"
 224                         "    WxH[xM] (width 'x' height 'x' mines)\n"
 225                         "    defaults to 30x16x99; mines will be ~20%% if not given\n"
 226                         "\n"
 227                         "Keybindings:\n"
 228                         "    hjkl: move left/down/up/right\n"
 229                         "    bduw: move to next boundary\n"
 230                         "    ^Gg$: move to the left/bottom/top/right\n"
 231                         "    o:    open/choord\n"
 232                         "    i:    flag/unflag\n"
 233                         "    space:modeful cursor (either open or flag)\n"
 234                         "    a:    toggle mode for space (open/flag)\n"
 235                         "    mX:   set a mark for letter X\n"
 236                         "    `X:   move to mark X (aliased to ')\n"
 237                         "    r:    start a new game\n"
 238                         "    q:    quit\n", argv[0]);
 239                         _exit(0);
 240                 }
 241         }
 242         /* end parse options*/
 243         if (optind < argc) { /* parse Fieldspec */
 244                 int n = sscanf (argv[optind], "%dx%dx%d", &f.w, &f.h, &f.m);
 245                 struct winsize w;
 246                 ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 247 #define CW op.scheme->cell_width
 248 #define WW w.ws_col /*window width  */
 249 #define WH w.ws_row /*window height */
 250 #define FW f.w      /* field width  */
 251 #define FH f.h      /* field height */
 252 #define MM 231      /* mouse maximum*/
 253 #define LB 2        /*  left border */
 254 #define RB 2        /* right border */
 255 #define TB 3        /*   top border */
 256 #define BB 2        /*bottom border */
 257
 258                 if (LB + FW*CW + RB > WW) FW = WW/CW - (LB+RB);
 259                 if (TB + FH    + BB > WH) FH = WH    - (TB+BB);
 260                 if (LB + FW*CW      > MM) FW = MM/CW - LB;
 261                 if (TB + FH         > MM) FH = MM    - TB;
 262
 263                 if (n == 1) {
 264                         fprintf (stderr, "Provide at least width and height to the Fieldspec.\r\n");
 265                         return 0;
 266                 } else if (n == 2) {
 267                         if (f.w < 30) f.m = f.w*f.h*.15625;
 268                         else f.m = f.w*f.h*.20625;
 269                         //hc: .35416_
 270                 }
 271 #undef CW
 272 #undef WW
 273 #undef WH
 274 #undef FW
 275 #undef FH
 276 #undef MM
 277 #undef LB
 278 #undef RB
 279 #undef TB
 280 #undef BB
 281         } else { /* use defaults */
 282                 f.w = 30;
 283                 f.h = 16;
 284                 f.m = 99;
 285         }
 286         /* check boundaries */
 287         if (f.m > (f.w-1) * (f.h-1)) {
 288                 f.m = (f.w-1) * (f.h-1);
 289                 fprintf (stderr, "too many mines. reduced to %d.\r\n", f.m);
 290         }
 291         /* end check */
 292
 293 newgame:
 294         f.c = alloc_array (f.h, f.w);
 295
 296         f.f = 0;
 297         f.t = 0;
 298         f.p[0] = 0;
 299         f.p[1] = 0;
 300
 301         int is_newgame = 1;
 302         int cheatmode = 0;
 303         f.s = MODE_OPEN;
 304         struct line_col markers[26];
 305         for (int i=26; i; markers[--i].l = -1);
 306
 307         /* switch to alternate screen */
 308         printf ("\033[?47h");
 309         alt_screen = 1;
 310         /* reset cursor, clear screen */
 311         printf ("\033[H\033[J");
 312
 313         /* swich charset, if necessary */
 314         if (op.scheme->init_seq != NULL) print (op.scheme->init_seq);
 315
 316         show_minefield (NORMAL);
 317
 318         /* enable mouse, hide cursor */
 319         printf ("\033[?1000h\033[?25l");
 320
 321         while (1) {
 322                 int l, c;
 323                 int action;
 324                 unsigned char mouse[3];
 325
 326                 action = getch(mouse);
 327                 switch (action) {
 328                 case ' ':
 329                         if (f.s == MODE_OPEN ||
 330                             f.c[f.p[0]][f.p[1]].o == OPENED) {
 331                                 switch (do_uncover(&is_newgame)) {
 332                                         case GAME_LOST: goto lose;
 333                                         case GAME_WON:  goto win;
 334                                 }
 335                         } else if (f.s == MODE_FLAG) {
 336                                 flag_square (f.p[0], f.p[1]);
 337                         } else if (f.s ==  MODE_QUESM) {
 338                                 quesm_square (f.p[0], f.p[1]);
 339                         }
 340                         break;
 341                 case 'a':
 342                         f.s = (f.s+1)%(op.mode+1);
 343                         show_minefield (cheatmode?SHOWMINES:NORMAL);
 344                         break;
 345                 case CTRSEQ_MOUSE_LEFT:
 346                         f.p[0] = screen2field_l (mouse[2]);
 347                         f.p[1] = screen2field_c (mouse[1]);
 348                         /* :D clicked: TODO: won't work in single-width mode! */
 349                         if (mouse[2] == LINE_OFFSET-1 &&
 350                            (mouse[1] == f.w+COL_OFFSET ||
 351                             mouse[1] == f.w+COL_OFFSET+1)) {
 352                                 free_field ();
 353                                 goto newgame;
 354                         }
 355                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 356                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 357                         /* fallthrough */
 358                 case 'o':
 359                         switch (do_uncover(&is_newgame)) {
 360                                 case GAME_LOST: goto lose;
 361                                 case GAME_WON:  goto win;
 362                         }
 363                         break;
 364                 case CTRSEQ_MOUSE_RIGHT:
 365                         f.p[0] = screen2field_l (mouse[2]);
 366                         f.p[1] = screen2field_c (mouse[1]);
 367                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 368                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 369                         /* fallthrough */
 370                 case 'i': flag_square (f.p[0], f.p[1]); break;
 371                 case '?':quesm_square (f.p[0], f.p[1]); break;
 372                 case 'h': cursor_move (f.p[0],    f.p[1]-1 ); break;
 373                 case 'j': cursor_move (f.p[0]+1,  f.p[1]   ); break;
 374                 case 'k': cursor_move (f.p[0]-1,  f.p[1]   ); break;
 375                 case 'l': cursor_move (f.p[0],    f.p[1]+1 ); break;
 376                 case 'w': to_next_boundary (f.p[0], f.p[1], '>'); break;
 377                 case 'b': to_next_boundary (f.p[0], f.p[1], '<'); break;
 378                 case 'u': to_next_boundary (f.p[0], f.p[1], '^'); break;
 379                 case 'd': to_next_boundary (f.p[0], f.p[1], 'v'); break;
 380                 case '0': /* fallthrough */
 381                 case '^': cursor_move (f.p[0],    0        ); break;
 382                 case '$': cursor_move (f.p[0],    f.w-1    ); break;
 383                 case 'g': cursor_move (0,         f.p[1]   ); break;
 384                 case 'G': cursor_move (f.h-1,     f.p[1]   ); break;
 385                 case 'm':
 386                         action = tolower(getch(mouse));
 387                         if (action < 'a' || action > 'z') break;/*out of bound*/
 388                         markers[action-'a'].l = f.p[0];
 389                         markers[action-'a'].c = f.p[1];
 390                         break;
 391                 case'\'': /* fallthrough */
 392                 case '`':
 393                         action = tolower(getch(mouse));
 394                         if (action < 'a' || action > 'z' /* out of bound or */
 395                             || markers[action-'a'].l == -1) break; /* unset */
 396                         cursor_move (markers[action-'a'].l, markers[action-'a'].c);
 397                         break;
 398                 case 'r': /* start a new game */
 399                         free_field ();
 400                         goto newgame;
 401                 case 'q':
 402                         goto quit;
 403                 case '\014': /* Ctrl-L -- redraw */
 404                         show_minefield (NORMAL);
 405                         break;
 406                 case '\\':
 407                         if (is_newgame) {
 408                                 is_newgame = 0;
 409                                 fill_minefield (-1, -1);
 410                                 timer_setup(1);
 411                         }
 412                         show_minefield (cheatmode?NORMAL:SHOWMINES);
 413                         cheatmode = !cheatmode;
 414                         break;
 415                 }
 416         }
 417
 418 win:
 419 lose:
 420         timer_setup(0); /* stop timer */
 421         show_minefield (SHOWMINES);
 422         int gotaction;
 423         do {
 424                 unsigned char mouse[3];
 425                 gotaction = getch(mouse);
 426                 /* :D clicked: TODO: won't work in single-width mode! */
 427                 if (gotaction==CTRSEQ_MOUSE_LEFT && mouse[2]==LINE_OFFSET-1 &&
 428                    (mouse[1]==f.w+COL_OFFSET || mouse[1]==f.w+COL_OFFSET+1)) {
 429                         free_field ();
 430                         goto newgame;
 431                 } else if (gotaction == 'r') {
 432                         free_field ();
 433                         goto newgame;
 434                 } else if (gotaction == 'q') {
 435                         goto quit;
 436                 }
 437         } while (1);
 438
 439 quit:
 440         return 0;
 441 }
 442
 443 void quit () {
 444         move(0,0); //move(f.h+LINE_OFFSET+2, 0);
 445         /* disable mouse, show cursor */
 446         printf ("\033[?9l\033[?25h");
 447         /* reset charset, if necessary */
 448         if (op.scheme && op.scheme->reset_seq) print (op.scheme->reset_seq);
 449         /* revert to primary screen */
 450         if (alt_screen) printf ("\033[?47l");
 451         free_field ();
 452         restore_term_mode(saved_term_mode);
 453 }
 454
 455 /* I haven't won as long as a cell exists, that
 456     - I haven't opened, and
 457     - is not a mine */
 458 int everything_opened () {
 459         for (int row = 0; row < f.h; row++)
 460                 for (int col = 0; col < f.w; col++)
 461                         if (f.c[row][col].o == CLOSED &&
 462                                 f.c[row][col].m == NO_MINE  ) return 0;
 463         return 1;
 464 }
 465
 466 int wait_mouse_up (int l, int c) {
 467         unsigned char mouse2[3];
 468         int level = 1;
 469         int l2, c2;
 470
 471         /* show :o face */
 472         move (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 473
 474         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 475                 /* show a pushed-in button if cursor is on minefield */
 476                 move (l+LINE_OFFSET, field2screen_c(c));
 477                 fputs (op.scheme->mouse_highlight, stdout);
 478         }
 479
 480         while (level > 0) {
 481                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 482                         /* ignore mouse wheel events: */
 483                         if (mouse2[0] & 0x40) continue;
 484
 485                         else if (mouse2[0]&3 == 3) level--; /* release event */
 486                         else level++; /* another button pressed */
 487                 }
 488         }
 489
 490         move (1, field2screen_c (f.w/2)-1); print (EMOT(SMILE)); //TODO: does not respect mode (SHOWMINES, GAME_WON, GAME_LOST)
 491         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 492                 partial_show_minefield (l, c, NORMAL);
 493         }
 494         c2 = screen2field_c(mouse2[1]);
 495         l2 = screen2field_l(mouse2[2]);
 496         return ((l2 == l) && (c2 == c));
 497 }
 498
 499 int choord_square (int line, int col) {
 500         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 501                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 502                         if (f.c[l][c].f != FLAG) {
 503                                 if (uncover_square (l, c))
 504                                          return 1;
 505                         }
 506                 }
 507         }
 508
 509         return 0;
 510 }
 511
 512 int uncover_square (int l, int c) {
 513         f.c[l][c].o = OPENED;
 514         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 515         partial_show_minefield (l, c, NORMAL);
 516
 517         if (f.c[l][c].m) {
 518                 f.c[l][c].m = DEATH_MINE;
 519                 return 1;
 520         }
 521
 522         /* check for chording */
 523         if (f.c[l][c].n == 0) {
 524                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 525                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 526                                 int newl = l + choord_l;
 527                                 int newc = c + choord_c;
 528                                 if (newl >= 0 && newl < f.h &&
 529                                     newc >= 0 && newc < f.w &&
 530                                     f.c[newl][newc].o == CLOSED &&
 531                                     uncover_square (newl, newc)) {
 532                                          return 1;
 533                                 }
 534                         }
 535                 }
 536         }
 537
 538         return 0;
 539 }
 540
 541 void flag_square (int l, int c) {
 542         static char modechar[] = {'*', '!', '?'};
 543
 544         if (f.c[l][c].o != CLOSED) return;
 545         /* cycles through flag/quesm/noflag (uses op.mode to detect which ones
 546         are allowed) */
 547         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 548         if (f.c[l][c].f==FLAG) f.f++;
 549         else f.f--; //WARN: breaks on `-q'!
 550         partial_show_minefield (l, c, NORMAL);
 551         move (1, op.scheme->cell_width);
 552         printf ("[%03d%c]", f.m - f.f, modechar[f.s]);
 553 }
 554
 555 void quesm_square (int l, int c) {
 556         /* toggle question mark / none. won't turn flags into question marks.
 557         unlike flag_square, this function doesn't respect `-q'. */
 558         if      (f.c[l][c].o != CLOSED) return;
 559         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 560         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 561         partial_show_minefield (l, c, NORMAL);
 562 }
 563
 564 int do_uncover (int* is_newgame) {
 565         if (*is_newgame) {
 566                 *is_newgame = 0;
 567                 fill_minefield (f.p[0], f.p[1]);
 568                 timer_setup(1);
 569         }
 570
 571         if (f.c[f.p[0]][f.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 572         if (f.c[f.p[0]][f.p[1]].o == CLOSED) {
 573                 if (uncover_square (f.p[0], f.p[1])) return GAME_LOST;
 574         } else if (get_neighbours (f.p[0], f.p[1], 1) == 0) {
 575                 if (choord_square (f.p[0], f.p[1])) return GAME_LOST;
 576         }
 577         if (everything_opened()) return GAME_WON;
 578
 579         return GAME_INPROGRESS;
 580 }
 581
 582 void fill_minefield (int l, int c) {
 583         srand (time(0));
 584         int mines_set = f.m;
 585         while (mines_set) {
 586                 int line = rand() % f.h;
 587                 int col = rand() % f.w;
 588
 589                 if (f.c[line][col].m) {
 590                 /* skip if field already has a mine */
 591                         continue;
 592                 } else if ((line == l) && (col == c)) {
 593                 /* don't put a mine on the already opened (first click) field */
 594                         continue;
 595                 } else {
 596                         mines_set--;
 597                         f.c[line][col].m = STD_MINE;
 598                 }
 599         }
 600
 601         /* precalculate neighbours */
 602         for (int l=0; l < f.h; l++)
 603                 for (int c=0; c < f.w; c++)
 604                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 605 }
 606
 607 void move (int line, int col) {
 608         printf ("\033[%d;%dH", line+1, col+1);
 609 }
 610
 611 /* absolute coordinates! */
 612 void cursor_move (int l, int c) {
 613         partial_show_minefield (f.p[0], f.p[1], NORMAL);
 614         /* update f.p */
 615         f.p[0] = CLAMP(l, 0, f.h-1);
 616         f.p[1] = CLAMP(c, 0, f.w-1);
 617         move (f.p[0]+LINE_OFFSET, field2screen_c(f.p[1]));
 618         //fputs (op.scheme->mouse_highlight, stdout);
 619
 620         /*if (!f.c[f.p[0]][f.p[1]].f)*/ print("\033[7m");//invert unless ! or ?
 621         partial_show_minefield (f.p[0], f.p[1], HIGHLIGHT);
 622         print("\033[0m");//un-invert
 623 }
 624
 625 /* to_next_boundary(): move into the supplied direction until a change in open-
 626 state or flag-state is found and move there. falls back to BIG_MOVE. */
 627 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 628         new_ ## X OP ## = BIG_MOVE;\
 629         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 630                 if ((f.c[L ][C ].o<<2 + f.c[L ][C ].f) \
 631                  != (f.c[L1][C1].o<<2 + f.c[L1][C1].f)) {\
 632                         new_ ## X = i OP 1;\
 633                         break;\
 634                 }\
 635         } while(0)
 636 void to_next_boundary (int l, int c, char direction) {
 637         int new_l = l;
 638         int new_c = c;
 639         switch (direction) {
 640         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 641         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 642         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 643         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 644         }
 645
 646         cursor_move (new_l, new_c);
 647 }
 648 #undef FIND_NEXT
 649
 650 char* cell2schema (int l, int c, int mode) {
 651         struct minecell cell = f.c[l][c];
 652         /* move past invert-ctrlsequence when highlighting the cursor: */
 653         int offset = ((mode==HIGHLIGHT)*op.scheme->flag_offset);
 654
 655         if (mode == SHOWMINES) return (
 656                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged+offset:
 657                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf+offset:
 658                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 659                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 660                 cell.o == CLOSED          ? op.scheme->field_closed:
 661                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 662          else return (
 663                 cell.f == FLAG            ? op.scheme->field_flagged+offset:
 664                 cell.f == QUESM           ? op.scheme->field_question+offset:
 665                 cell.o == CLOSED          ? op.scheme->field_closed:
 666                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 667                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 668                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 669 }
 670
 671 void partial_show_minefield (int l, int c, int mode) {
 672         move (l+LINE_OFFSET, field2screen_c(c));
 673
 674         print (cell2schema(l, c, mode));
 675 }
 676
 677 void show_minefield (int mode) {
 678         int dtime;
 679         int n1, n2; /* determine size of variable width fields */
 680         int half_spaces = f.w*op.scheme->cell_width/2;
 681         static char modechar[] = {'*', '!', '?'};
 682
 683         move (0,0);
 684
 685         if (f.t == 0) {
 686                 dtime = 0;
 687         } else {
 688                 dtime = difftime (time(NULL), f.t);
 689         }
 690
 691         /* first line */
 692         print (op.scheme->border_top_l);
 693         printm (f.w, op.scheme->border_top_m);
 694         printf ("%s\r\n", op.scheme->border_top_r);
 695         /* second line */
 696         printf("%s[%03d%c]%.*s%s%.*s[%03d]%s\r\n",
 697           op.scheme->border_status_l,
 698           f.m - f.f,
 699           modechar[f.s],
 700           MAX(0,half_spaces-7-(f.m-f.f>999)), spaces,
 701           mode==SHOWMINES?everything_opened()?EMOT(WON):EMOT(DEAD):EMOT(SMILE),
 702           MAX(0,half_spaces-6-(dtime>999)), spaces,
 703           dtime,
 704           op.scheme->border_status_r);
 705         /* third line */
 706         print (op.scheme->border_spacer_l);
 707         printm (f.w, op.scheme->border_spacer_m);
 708         print (op.scheme->border_spacer_r);
 709         print ("\r\n");
 710         /* main body */
 711         for (int l = 0; l < f.h; l++) {
 712                 print (op.scheme->border_field_l);
 713                 for (int c = 0; c < f.w; c++) {
 714                         print (cell2schema(l, c, mode));
 715                 }
 716                 print (op.scheme->border_field_r); print ("\r\n");
 717         }
 718         /* last line */
 719         print (op.scheme->border_bottom_l);
 720         printm (f.w*op.scheme->cell_width,op.scheme->border_bottom_m);
 721         print (op.scheme->border_bottom_r);
 722         print ("\r\n");
 723 }
 724
 725 int get_neighbours (int line, int col, int reduced_mode) {
 726         /* counts mines surrounding a square
 727            modes: 0=normal; 1=reduced */
 728
 729         int count = 0;
 730
 731         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 732                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 733                         if (!l && !c) continue;
 734
 735                         count += !!f.c[l][c].m;
 736                         count -= reduced_mode * f.c[l][c].f==FLAG;
 737                 }
 738         }
 739         return count;
 740 }
 741
 742 struct minecell** alloc_array (int lines, int cols) {
 743         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 744         if (a == NULL) return NULL;
 745         for (int l = 0; l < lines; l++) {
 746                 a[l] = calloc (cols, sizeof(struct minecell));
 747                 if (a[l] == NULL) goto unalloc;
 748         }
 749
 750         return a;
 751 unalloc:
 752         for (int l = 0; l < lines; l++)
 753                 free (a[l]);
 754         return NULL;
 755 }
 756
 757 void free_field () {
 758         if (f.c == NULL) return;
 759         for (int l = 0; l < f.h; l++) {
 760                 free (f.c[l]);
 761         }
 762
 763         free (f.c);
 764         f.c = NULL;
 765 }
 766
 767 int screen2field_l (int l) {
 768         return (l-LINE_OFFSET) - 1;
 769 }
 770 /* some trickery is required to extract the mouse position from the cell width,
 771 depending on wheather we are using full width characters or double line width.
 772 WARN: tested only with scheme.cell_width = 1 and scheme.cell_width = 2. */
 773 int screen2field_c (int c) {
 774         return (c-COL_OFFSET+1 - 2*(op.scheme->cell_width%2))/2 - op.scheme->cell_width/2;
 775 }
 776 int field2screen_l (int l) {
 777         return 0; //TODO: is never used, therefore not implemented
 778 }
 779 int field2screen_c (int c) {
 780         return (op.scheme->cell_width*c+COL_OFFSET - (op.scheme->cell_width%2));
 781 }
 782
 783 enum esc_states {
 784         START,
 785         ESC_SENT,
 786         CSI_SENT,
 787         MOUSE_EVENT,
 788 };
 789 int getctrlseq (unsigned char* buf) {
 790         int c;
 791         int state = START;
 792         int offset = 0x20; /* never sends control chars as data */
 793         while ((c = getchar()) != EOF) {
 794                 switch (state) {
 795                 case START:
 796                         switch (c) {
 797                         case '\033': state=ESC_SENT; break;
 798                         default: return c;
 799                         }
 800                         break;
 801                 case ESC_SENT:
 802                         switch (c) {
 803                         case '[': state=CSI_SENT; break;
 804                         default: return CTRSEQ_INVALID;
 805                         }
 806                         break;
 807                 case CSI_SENT:
 808                         switch (c) {
 809                         case 'M': state=MOUSE_EVENT; break;
 810                         default: return CTRSEQ_INVALID;
 811                         }
 812                         break;
 813                 case MOUSE_EVENT:
 814                         buf[0] = c - offset;
 815                         buf[1] = getchar() - offset;
 816                         buf[2] = getchar() - offset;
 817                         return CTRSEQ_MOUSE;
 818                 default:
 819                         return CTRSEQ_INVALID;
 820                 }
 821         }
 822         return 2;
 823 }
 824
 825 int getch(unsigned char* buf) {
 826 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 827 compatible with the ncurses implementation of same name */
 828         int action = getctrlseq(buf);
 829         int l, c;
 830         switch (action) {
 831         case CTRSEQ_MOUSE:
 832                 l = screen2field_l (buf[2]);
 833                 c = screen2field_c (buf[1]);
 834
 835                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 836                 int success = wait_mouse_up(l, c);
 837
 838                 /* mouse moved while pressed: */
 839                 if (!success) return CTRSEQ_INVALID;
 840
 841                 switch (buf[0]) {
 842                 case 0: return CTRSEQ_MOUSE_LEFT;
 843                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 844                 case 2: return CTRSEQ_MOUSE_RIGHT;
 845                 }
 846         }
 847
 848         return action;
 849 }
 850
 851 void timer_setup (int enable) {
 852         static struct itimerval tbuf;
 853         tbuf.it_interval.tv_sec  = 1;
 854         tbuf.it_interval.tv_usec = 0;
 855
 856         if (enable) {
 857                 f.t = time(NULL);
 858                 tbuf.it_value.tv_sec  = 1;
 859                 tbuf.it_value.tv_usec = 0;
 860                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 861                         perror("setitimer");
 862                         exit(1);
 863                 }
 864         } else {
 865                 tbuf.it_value.tv_sec  = 0;
 866                 tbuf.it_value.tv_usec = 0;
 867                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 868                         perror("setitimer");
 869                         exit(1);
 870                 }
 871         }
 872
 873 }