mines_2017.c

   1 /*******************************************************************************
   2  minesviiper 0.3.14592
   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 <signal.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/ioctl.h>
  25 #include <sys/time.h>
  26 #include <termios.h>
  27 #include <time.h>
  28 #include <unistd.h>
  29
  30 #include "schemes.h"
  31
  32 #define LINE_OFFSET 3
  33 #define COL_OFFSET 2
  34 #define BIG_MOVE 5
  35
  36 #define MIN(a,b) (a>b?b:a)
  37 #define MAX(a,b) (a>b?a:b)
  38 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
  39 #define printm(n, s) for (int _loop = 0; _loop < n; _loop++) fputs (s, stdout)
  40 #define print(str) fputs (str?str:"", stdout)
  41 #define EMOT(e) op.scheme->emoticons[EMOT_ ## e]
  42 #define BORDER(l, c) op.scheme->border[B_ ## l][B_ ## c]
  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         int o; /* mode */
  62 } f;
  63
  64 struct opt {
  65         struct minescheme* scheme;
  66         int mode; /* allow flags? quesm? */
  67 } op;
  68
  69 struct line_col {
  70         int l;
  71         int c;
  72 };
  73
  74 void fill_minefield (int, int);
  75 void move (int, int);
  76 void cursor_move (int, int);
  77 void to_next_boundary (int l, int c, char direction);
  78 int getch (unsigned char*);
  79 int getctrlseq (unsigned char*);
  80 int everything_opened (void);
  81 int wait_mouse_up (int, int);
  82 void partial_show_minefield (int, int, int);
  83 void show_minefield (int);
  84 int get_neighbours (int, int, int);
  85 int uncover_square (int, int);
  86 void flag_square (int, int);
  87 void quesm_square (int, int);
  88 int choord_square (int, int);
  89 int do_uncover (int*);
  90 struct minecell** alloc_array (int, int);
  91 void free_field (void);
  92 char* get_emoticon(void);
  93 int screen2field_l (int);
  94 int screen2field_c (int);
  95 int field2screen_l (int);
  96 int field2screen_c (int);
  97 int clicked_emoticon (unsigned char*);
  98 void quit(void);
  99 void signal_handler (int signum);
 100 void timer_setup (int);
 101
 102 enum modes {
 103         NORMAL,
 104         REDUCED,
 105         SHOWMINES,
 106         HIGHLIGHT,
 107 };
 108 enum flagtypes {
 109         NOFLAG,
 110         FLAG,
 111         QUESM,
 112 };
 113 enum fieldopenstates {
 114         CLOSED,
 115         OPENED,
 116 };
 117 enum game_states {
 118         GAME_INPROGRESS,
 119         GAME_NEW,
 120         GAME_WON,
 121         GAME_LOST,
 122 };
 123 enum space_modes {
 124         MODE_OPEN,
 125         MODE_FLAG,
 126         MODE_QUESM,
 127 };
 128 enum event {
 129         /* for getctrlseq() */
 130         CTRSEQ_NULL    =  0,
 131         CTRSEQ_EOF     = -1,
 132         CTRSEQ_INVALID = -2,
 133         CTRSEQ_MOUSE   = -3,
 134         /* for getch() */
 135         CTRSEQ_MOUSE_LEFT   = -4,
 136         CTRSEQ_MOUSE_MIDDLE = -5,
 137         CTRSEQ_MOUSE_RIGHT  = -6,
 138         CTRSEQ_CURSOR_LEFT  = -7,
 139         CTRSEQ_CURSOR_DOWN  = -8,
 140         CTRSEQ_CURSOR_UP    = -9,
 141         CTRSEQ_CURSOR_RIGHT = -10,
 142 };
 143 enum mine_types {
 144         NO_MINE,
 145         STD_MINE,
 146         DEATH_MINE,
 147 };
 148
 149 #define CW op.scheme->cell_width
 150 void signal_handler (int signum) {
 151         int dtime;
 152         switch (signum) {
 153         case SIGALRM:
 154                 dtime = difftime (time(NULL), f.t);
 155                 move (1, f.w*CW-(CW%2)-3-(dtime>999));
 156                 printf ("[%03d]", f.t?dtime:0);
 157                 break;
 158         case SIGINT:
 159                 exit(128+SIGINT);
 160         }
 161 }
 162 #undef CW
 163
 164 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 165 struct termios saved_term_mode;
 166 struct termios set_raw_term_mode() {
 167         struct termios cur_term_mode, raw_term_mode;
 168
 169         tcgetattr(STDIN_FILENO, &cur_term_mode);
 170         raw_term_mode = cur_term_mode;
 171         raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 172         raw_term_mode.c_cc[VMIN] = 1 ;
 173         raw_term_mode.c_cc[VTIME] = 0;
 174         tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 175
 176         return cur_term_mode;
 177 }
 178 void restore_term_mode(struct termios saved_term_mode) {
 179         tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 180 }
 181
 182
 183 int main (int argc, char** argv) {
 184         struct sigaction saction;
 185
 186         saction.sa_handler = signal_handler;
 187         sigemptyset(&saction.sa_mask);
 188         saction.sa_flags   = 0;
 189         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 190                 perror("SIGALRM");
 191                 exit(1);
 192         }
 193
 194         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 195                 perror ("SIGINT");
 196                 exit (1);
 197         }
 198         /* end screen setup */
 199
 200         op.scheme = &symbols_mono;
 201         op.mode = FLAG;
 202         /* end defaults */
 203         /* parse options */
 204         int optget;
 205         opterr = 0; /* don't print message on unrecognized option */
 206         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
 207                 switch (optget) {
 208                 case 'n': op.mode    = NOFLAG; break;
 209                 case 'f': op.mode    = FLAG; break; /*default*/
 210                 case 'q': op.mode    = QUESM; break;
 211                 case 'c': op.scheme  = &symbols_col1; break;
 212                 case 'd': op.scheme  = &symbols_doublewidth; break;
 213                 case 'h':
 214                 default:
 215                         fprintf (stderr, "%s [OPTIONS] [FIELDSPEC]\n"
 216                         "OPTIONS:\n"
 217                         "    -n(o flagging)\n"
 218                         "    -f(lagging)\n"
 219                         "    -q(uestion marks)\n"
 220                         "    -c(olored symbols)\n"
 221                         "    -d(ec charset symbols)\n"
 222                         "FIELDSPEC:\n"
 223                         "    WxH[xM] (width 'x' height 'x' mines)\n"
 224                         "    defaults to 30x16x99; mines default to ~20%%\n"
 225                         "\n"
 226                         "Keybindings:\n"
 227                         "    hjkl: move left/down/up/right\n"
 228                         "    bduw: move to next boundary\n"
 229                         "    ^Gg$: move to the left/bottom/top/right\n"
 230                         "    z:    center cursor on minefield\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(optget=='h'?0:1);
 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 < 2) {
 264                         fprintf (stderr, "FIELDSPEC: WxH[xM]"
 265                         " (width 'x' height 'x' mines)\n");
 266                         return 1;
 267                 } else if (n == 2) {
 268                         if (f.w < 30) f.m = f.w*f.h*.15625;
 269                         else f.m = f.w*f.h*.20625;
 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         f.o = GAME_NEW;
 305         struct line_col markers[26];
 306         for (int i=26; i; markers[--i].l = -1);
 307
 308         /* setup the screen: */
 309         saved_term_mode = set_raw_term_mode();
 310         atexit (*quit);
 311         /* switch to alternate screen */
 312         printf ("\033[?47h");
 313         /* reset cursor, clear screen */
 314         printf ("\033[H\033[J");
 315
 316         /* swich charset, if necessary */
 317         if (op.scheme->init_seq != NULL) print (op.scheme->init_seq);
 318
 319         show_minefield (NORMAL);
 320
 321         /* enable mouse, hide cursor */
 322         printf ("\033[?1000h\033[?25l");
 323
 324         while (1) {
 325                 int l, c;
 326                 int action;
 327                 unsigned char mouse[3];
 328
 329                 action = getch(mouse);
 330                 switch (action) {
 331                 case ' ':
 332                         if (f.s == MODE_OPEN ||
 333                             f.c[f.p[0]][f.p[1]].o == OPENED) {
 334                                 switch (do_uncover(&is_newgame)) {
 335                                         case GAME_LOST: goto lose;
 336                                         case GAME_WON:  goto win;
 337                                 }
 338                         } else if (f.s == MODE_FLAG) {
 339                                 flag_square (f.p[0], f.p[1]);
 340                         } else if (f.s ==  MODE_QUESM) {
 341                                 quesm_square (f.p[0], f.p[1]);
 342                         }
 343                         break;
 344                 case 'a':
 345                         f.s = (f.s+1)%(op.mode+1);
 346                         show_minefield (cheatmode?SHOWMINES:NORMAL);
 347                         break;
 348                 case CTRSEQ_MOUSE_LEFT:
 349                         if (clicked_emoticon(mouse)) {
 350                                 free_field ();
 351                                 goto newgame;
 352                         }
 353                         if (screen2field_c (mouse[1]) < 0    ||
 354                             screen2field_c (mouse[1]) >= f.w ||
 355                             screen2field_l (mouse[2]) <  0   ||
 356                             screen2field_l (mouse[2]) >= f.h)   break;
 357                         f.p[0] = screen2field_l (mouse[2]);
 358                         f.p[1] = screen2field_c (mouse[1]);
 359                         /* fallthrough */
 360                 case 'o':
 361                         switch (do_uncover(&is_newgame)) {
 362                                 case GAME_LOST: goto lose;
 363                                 case GAME_WON:  goto win;
 364                         }
 365                         break;
 366                 case CTRSEQ_MOUSE_RIGHT:
 367                         if (screen2field_c (mouse[1]) < 0    ||
 368                             screen2field_c (mouse[1]) >= f.w ||
 369                             screen2field_l (mouse[2]) <  0   ||
 370                             screen2field_l (mouse[2]) >= f.h)   break;
 371                         f.p[0] = screen2field_l (mouse[2]);
 372                         f.p[1] = screen2field_c (mouse[1]);
 373                         /* fallthrough */
 374                 case 'i': flag_square (f.p[0], f.p[1]); break;
 375                 case '?':quesm_square (f.p[0], f.p[1]); break;
 376                 case CTRSEQ_CURSOR_LEFT:
 377                 case 'h': cursor_move (f.p[0],   f.p[1]-1 ); break;
 378                 case CTRSEQ_CURSOR_DOWN:
 379                 case 'j': cursor_move (f.p[0]+1, f.p[1]   ); break;
 380                 case CTRSEQ_CURSOR_UP:
 381                 case 'k': cursor_move (f.p[0]-1, f.p[1]   ); break;
 382                 case CTRSEQ_CURSOR_RIGHT:
 383                 case 'l': cursor_move (f.p[0],   f.p[1]+1 ); break;
 384                 case 'w': to_next_boundary (f.p[0], f.p[1], '>'); break;
 385                 case 'b': to_next_boundary (f.p[0], f.p[1], '<'); break;
 386                 case 'u': to_next_boundary (f.p[0], f.p[1], '^'); break;
 387                 case 'd': to_next_boundary (f.p[0], f.p[1], 'v'); break;
 388                 case '0': /* fallthrough */
 389                 case '^': cursor_move (f.p[0],    0        ); break;
 390                 case '$': cursor_move (f.p[0],    f.w-1    ); break;
 391                 case 'g': cursor_move (0,         f.p[1]   ); break;
 392                 case 'G': cursor_move (f.h-1,     f.p[1]   ); break;
 393                 case 'z': cursor_move (f.h/2, f.w/2); break;
 394                 case 'm':
 395                         action = tolower(getch(mouse));
 396                         if (action < 'a' || action > 'z') break;/*out of bound*/
 397                         markers[action-'a'].l = f.p[0];
 398                         markers[action-'a'].c = f.p[1];
 399                         break;
 400                 case'\'': /* fallthrough */
 401                 case '`':
 402                         action = tolower(getch(mouse));
 403                         if (action < 'a' || action > 'z' /* out of bound or */
 404                             || markers[action-'a'].l == -1) break; /* unset */
 405                         cursor_move (markers[action-'a'].l, markers[action-'a'].c);
 406                         break;
 407                 case 'r': /* start a new game */
 408                         free_field ();
 409                         goto newgame;
 410                 case 'q':
 411                         goto quit;
 412                 case '\014': /* Ctrl-L -- redraw */
 413                         show_minefield (NORMAL);
 414                         break;
 415                 case '\\':
 416                         if (is_newgame) {
 417                                 is_newgame = 0;
 418                                 fill_minefield (-1, -1);
 419                                 timer_setup(1);
 420                         }
 421                         show_minefield (cheatmode?NORMAL:SHOWMINES);
 422                         cheatmode = !cheatmode;
 423                         break;
 424                 }
 425         }
 426
 427 win:    f.o = GAME_WON;  goto endgame;
 428 lose:   f.o = GAME_LOST; goto endgame;
 429 endgame:
 430         timer_setup(0); /* stop timer */
 431         show_minefield (SHOWMINES);
 432         int gotaction;
 433         do {
 434                 unsigned char mouse[3];
 435                 gotaction = getch(mouse);
 436                 if (gotaction==CTRSEQ_MOUSE_LEFT && clicked_emoticon(mouse)) {
 437                         free_field ();
 438                         goto newgame;
 439                 } else if (gotaction == 'r') {
 440                         free_field ();
 441                         goto newgame;
 442                 } else if (gotaction == 'q') {
 443                         goto quit;
 444                 }
 445         } while (1);
 446
 447 quit:
 448         return 0;
 449 }
 450
 451 void quit (void) {
 452         //move(0,0); //move(f.h+LINE_OFFSET+2, 0);
 453         printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 454         print (op.scheme->reset_seq); /* reset charset, if necessary */
 455         printf ("\033[?47l");         /* revert to primary screen */
 456         free_field ();
 457         restore_term_mode(saved_term_mode);
 458 }
 459
 460 /* I haven't won as long as a cell exists, that
 461     - I haven't opened, and
 462     - is not a mine */
 463 int everything_opened (void) {
 464         for (int row = 0; row < f.h; row++)
 465                 for (int col = 0; col < f.w; col++)
 466                         if (f.c[row][col].o == CLOSED &&
 467                             f.c[row][col].m == NO_MINE  ) return 0;
 468         return 1;
 469 }
 470
 471 int wait_mouse_up (int l, int c) {
 472         unsigned char mouse2[3];
 473         int level = 1;
 474         int l2, c2;
 475
 476         /* show :o face */
 477         move (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 478
 479         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 480                 /* show a pushed-in button if cursor is on minefield */
 481                 move (l+LINE_OFFSET, field2screen_c(c));
 482                 fputs (op.scheme->mouse_highlight, stdout);
 483         }
 484
 485         while (level > 0) {
 486                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 487                         /* ignore mouse wheel events: */
 488                         if (mouse2[0] & 0x40) continue;
 489
 490                         else if (mouse2[0]&3 == 3) level--; /* release event */
 491                         else level++; /* another button pressed */
 492                 }
 493         }
 494
 495         move (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 496
 497         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 498                 partial_show_minefield (l, c, NORMAL);
 499         }
 500         c2 = screen2field_c(mouse2[1]);
 501         l2 = screen2field_l(mouse2[2]);
 502         return ((l2 == l) && (c2 == c));
 503 }
 504
 505 int choord_square (int line, int col) {
 506         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 507                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 508                         if (f.c[l][c].f != FLAG) {
 509                                 if (uncover_square (l, c))
 510                                          return 1;
 511                         }
 512                 }
 513         }
 514
 515         return 0;
 516 }
 517
 518 int uncover_square (int l, int c) {
 519         f.c[l][c].o = OPENED;
 520         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 521         partial_show_minefield (l, c, NORMAL);
 522
 523         if (f.c[l][c].m) {
 524                 f.c[l][c].m = DEATH_MINE;
 525                 return 1;
 526         }
 527
 528         /* check for chording */
 529         if (f.c[l][c].n == 0) {
 530                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 531                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 532                                 int newl = l + choord_l;
 533                                 int newc = c + choord_c;
 534                                 if (newl >= 0 && newl < f.h &&
 535                                     newc >= 0 && newc < f.w &&
 536                                     f.c[newl][newc].o == CLOSED &&
 537                                     uncover_square (newl, newc)) {
 538                                          return 1;
 539                                 }
 540                         }
 541                 }
 542         }
 543
 544         return 0;
 545 }
 546
 547 void flag_square (int l, int c) {
 548         static char modechar[] = {'*', '!', '?'};
 549
 550         if (f.c[l][c].o != CLOSED) return;
 551         /* cycles through flag/quesm/noflag (uses op.mode to detect which ones
 552         are allowed) */
 553         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 554         if (f.c[l][c].f==FLAG) f.f++;
 555         else f.f--; //WARN: breaks on `-q'!
 556         partial_show_minefield (l, c, NORMAL);
 557         move (1, op.scheme->cell_width);
 558         printf ("[%03d%c]", f.m - f.f, modechar[f.s]);
 559 }
 560
 561 void quesm_square (int l, int c) {
 562         /* toggle question mark / none. won't turn flags into question marks.
 563         unlike flag_square, this function doesn't respect `-q'. */
 564         if      (f.c[l][c].o != CLOSED) return;
 565         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 566         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 567         partial_show_minefield (l, c, NORMAL);
 568 }
 569
 570 int do_uncover (int* is_newgame) {
 571         if (*is_newgame) {
 572                 *is_newgame = 0;
 573                 fill_minefield (f.p[0], f.p[1]);
 574                 timer_setup(1);
 575         }
 576
 577         if (f.c[f.p[0]][f.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 578         if (f.c[f.p[0]][f.p[1]].o == CLOSED) {
 579                 if (uncover_square (f.p[0], f.p[1])) return GAME_LOST;
 580         } else if (get_neighbours (f.p[0], f.p[1], 1) == 0) {
 581                 if (choord_square (f.p[0], f.p[1])) return GAME_LOST;
 582         }
 583         if (everything_opened()) return GAME_WON;
 584
 585         return GAME_INPROGRESS;
 586 }
 587
 588 void fill_minefield (int l, int c) {
 589         srand (time(0));
 590         int mines_set = f.m;
 591         while (mines_set) {
 592                 int line = rand() % f.h;
 593                 int col = rand() % f.w;
 594
 595                 if (f.c[line][col].m) {
 596                 /* skip if field already has a mine */
 597                         continue;
 598                 } else if ((line == l) && (col == c)) {
 599                 /* don't put a mine on the already opened (first click) field */
 600                         continue;
 601                 } else {
 602                         mines_set--;
 603                         f.c[line][col].m = STD_MINE;
 604                 }
 605         }
 606
 607         /* precalculate neighbours */
 608         for (int l=0; l < f.h; l++)
 609                 for (int c=0; c < f.w; c++)
 610                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 611 }
 612
 613 void move (int line, int col) {
 614         printf ("\033[%d;%dH", line+1, col+1);
 615 }
 616
 617 /* absolute coordinates! */
 618 void cursor_move (int l, int c) {
 619         partial_show_minefield (f.p[0], f.p[1], NORMAL);
 620         /* update f.p */
 621         f.p[0] = CLAMP(l, 0, f.h-1);
 622         f.p[1] = CLAMP(c, 0, f.w-1);
 623         move (f.p[0]+LINE_OFFSET, field2screen_c(f.p[1]));
 624         //fputs (op.scheme->mouse_highlight, stdout);
 625
 626         /* invert unless ! or ? (and flag_offset is used in the scheme): */
 627         if (!f.c[f.p[0]][f.p[1]].f || !op.scheme->flag_offset)
 628                 print("\033[7m");
 629         partial_show_minefield (f.p[0], f.p[1], HIGHLIGHT);
 630         print("\033[0m");//un-invert
 631 }
 632
 633 /* to_next_boundary(): move into the supplied direction until a change in open-
 634 state or flag-state is found and move there. falls back to BIG_MOVE. */
 635 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 636         new_ ## X OP ## = BIG_MOVE;\
 637         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 638                 if ((f.c[L ][C ].o<<2 + f.c[L ][C ].f) \
 639                  != (f.c[L1][C1].o<<2 + f.c[L1][C1].f)) {\
 640                         new_ ## X = i OP 1;\
 641                         break;\
 642                 }\
 643         } while(0)
 644 void to_next_boundary (int l, int c, char direction) {
 645         int new_l = l;
 646         int new_c = c;
 647         switch (direction) {
 648         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 649         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 650         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 651         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 652         }
 653
 654         cursor_move (new_l, new_c);
 655 }
 656 #undef FIND_NEXT
 657
 658 char* cell2schema (int l, int c, int mode) {
 659         struct minecell cell = f.c[l][c];
 660         /* move past invert-ctrlsequence when highlighting the cursor: */
 661         int offset = ((mode==HIGHLIGHT)*op.scheme->flag_offset);
 662
 663         if (mode == SHOWMINES) return (
 664                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged+offset:
 665                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 666                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 667                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 668                 cell.o == CLOSED          ? op.scheme->field_closed:
 669                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 670          else return (
 671                 cell.f == FLAG            ? op.scheme->field_flagged+offset:
 672                 cell.f == QUESM           ? op.scheme->field_question+offset:
 673                 cell.o == CLOSED          ? op.scheme->field_closed:
 674                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 675                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 676                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 677 }
 678
 679 void partial_show_minefield (int l, int c, int mode) {
 680         move (l+LINE_OFFSET, field2screen_c(c));
 681
 682         print (cell2schema(l, c, mode));
 683 }
 684
 685 char* get_emoticon(void) {
 686         return f.o==GAME_WON ? EMOT(WON):
 687                f.o==GAME_LOST? EMOT(DEAD):
 688                 EMOT(SMILE);
 689 }
 690
 691 /* https://zserge.com/blog/c-for-loop-tricks.html */
 692 #define print_line(which) \
 693         for (int _break = (printf(BORDER(which,LEFT)), 1); _break; \
 694                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 695 #define print_border(which, width) \
 696         print_line(which) printm (width, BORDER(which,MIDDLE))
 697 void show_minefield (int mode) {
 698         int dtime = difftime (time(NULL), f.t)*!!f.t;
 699         int half_spaces = f.w*op.scheme->cell_width/2;
 700         int left_spaces = MAX(0,half_spaces-7-(f.m-f.f>999));
 701         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 702         static char modechar[] = {'*', '!', '?'};
 703
 704         move (0,0);
 705
 706         print_border(TOP, f.w);
 707         print_line(STATUS) {
 708                 printf("[%03d%c]%*s%s%*s[%03d]",
 709                   /* [ */ f.m - f.f, modechar[f.s], /* ] */
 710                   left_spaces,"", get_emoticon(), right_spaces,"",
 711                   /* [ */ dtime /* ] */);
 712         }
 713         print_border(DIVIDER, f.w);
 714         /* main body */
 715         for (int l = 0; l < f.h; l++) print_line(FIELD)
 716                 printm (f.w, cell2schema(l, _loop, mode));
 717         print_border(BOTTOM, f.w);
 718 }
 719
 720 int get_neighbours (int line, int col, int reduced_mode) {
 721         /* counts mines surrounding a square
 722            modes: 0=normal; 1=reduced */
 723
 724         int count = 0;
 725
 726         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 727                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 728                         if (!l && !c) continue;
 729
 730                         count += !!f.c[l][c].m;
 731                         count -= reduced_mode * f.c[l][c].f==FLAG;
 732                 }
 733         }
 734         return count;
 735 }
 736
 737 struct minecell** alloc_array (int lines, int cols) {
 738         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 739         if (a == NULL) return NULL;
 740         for (int l = 0; l < lines; l++) {
 741                 a[l] = calloc (cols, sizeof(struct minecell));
 742                 if (a[l] == NULL) goto unalloc;
 743         }
 744
 745         return a;
 746 unalloc:
 747         for (int l = 0; l < lines; l++)
 748                 free (a[l]);
 749         return NULL;
 750 }
 751
 752 void free_field (void) {
 753         if (f.c == NULL) return;
 754         for (int l = 0; l < f.h; l++) {
 755                 free (f.c[l]);
 756         }
 757
 758         free (f.c);
 759         f.c = NULL;
 760 }
 761
 762 int screen2field_l (int l) {
 763         return (l-LINE_OFFSET) - 1;
 764 }
 765 /* some trickery is required to extract the mouse position from the cell width,
 766 depending on wheather we are using full width characters or double line width.
 767 WARN: tested only with scheme.cell_width = 1 and scheme.cell_width = 2. */
 768 #define CW op.scheme->cell_width
 769 int screen2field_c (int c) {
 770         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 771 }
 772 int field2screen_l (int l) {
 773         return 0; //TODO: is never used, therefore not implemented
 774 }
 775 int field2screen_c (int c) {
 776         return (CW*c+COL_OFFSET - (CW%2));
 777 }
 778 int clicked_emoticon (unsigned char* mouse) {
 779         /* :D clicked: TODO: won't work in single-width mode! */
 780         return (mouse[2] == LINE_OFFSET-1 && (
 781                 mouse[1] == (f.w*CW/2)+COL_OFFSET ||
 782                 mouse[1] == (f.w*CW/2)+COL_OFFSET+1));
 783 }
 784 #undef CW
 785
 786 enum esc_states {
 787         START,
 788         ESC_SENT,
 789         CSI_SENT,
 790         MOUSE_EVENT,
 791 };
 792 int getctrlseq (unsigned char* buf) {
 793         int c;
 794         int state = START;
 795         int offset = 0x20; /* never sends control chars as data */
 796         while ((c = getchar()) != EOF) {
 797                 switch (state) {
 798                 case START:
 799                         switch (c) {
 800                         case '\033': state=ESC_SENT; break;
 801                         default: return c;
 802                         }
 803                         break;
 804                 case ESC_SENT:
 805                         switch (c) {
 806                         case '[': state=CSI_SENT; break;
 807                         default: return CTRSEQ_INVALID;
 808                         }
 809                         break;
 810                 case CSI_SENT:
 811                         switch (c) {
 812                         case 'A': return CTRSEQ_CURSOR_UP;
 813                         case 'B': return CTRSEQ_CURSOR_DOWN;
 814                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 815                         case 'D': return CTRSEQ_CURSOR_LEFT;
 816                         case 'M': state=MOUSE_EVENT; break;
 817                         default: return CTRSEQ_INVALID;
 818                         }
 819                         break;
 820                 case MOUSE_EVENT:
 821                         buf[0] = c - offset;
 822                         buf[1] = getchar() - offset;
 823                         buf[2] = getchar() - offset;
 824                         return CTRSEQ_MOUSE;
 825                 default:
 826                         return CTRSEQ_INVALID;
 827                 }
 828         }
 829         return 2;
 830 }
 831
 832 int getch(unsigned char* buf) {
 833 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 834 compatible with the ncurses implementation of same name */
 835         int action = getctrlseq(buf);
 836         int l, c;
 837         switch (action) {
 838         case CTRSEQ_MOUSE:
 839                 l = screen2field_l (buf[2]);
 840                 c = screen2field_c (buf[1]);
 841
 842                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 843                 int success = wait_mouse_up(l, c);
 844
 845                 /* mouse moved while pressed: */
 846                 if (!success) return CTRSEQ_INVALID;
 847
 848                 switch (buf[0]) {
 849                 case 0: return CTRSEQ_MOUSE_LEFT;
 850                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 851                 case 2: return CTRSEQ_MOUSE_RIGHT;
 852                 }
 853         }
 854
 855         return action;
 856 }
 857
 858 void timer_setup (int enable) {
 859         static struct itimerval tbuf;
 860         tbuf.it_interval.tv_sec  = 1;
 861         tbuf.it_interval.tv_usec = 0;
 862
 863         if (enable) {
 864                 f.t = time(NULL);
 865                 tbuf.it_value.tv_sec  = 1;
 866                 tbuf.it_value.tv_usec = 0;
 867                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 868                         perror("setitimer");
 869                         exit(1);
 870                 }
 871         } else {
 872                 tbuf.it_value.tv_sec  = 0;
 873                 tbuf.it_value.tv_usec = 0;
 874                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 875                         perror("setitimer");
 876                         exit(1);
 877                 }
 878         }
 879
 880 }