mines_2017.c

   1 /*******************************************************************************
   2  minesviiper 0.3.1459
   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              - bduw to jump left/down/up/right by 5 cells
  12              - o to open and choord
  13              - i to flag/unflag
  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 void quit(void);
  98 void signal_handler (int signum);
  99 void timer_setup (int);
 100
 101 enum modes {
 102         NORMAL,
 103         REDUCED,
 104         SHOWMINES,
 105         HIGHLIGHT,
 106 };
 107 enum flagtypes {
 108         NOFLAG,
 109         FLAG,
 110         QUESM,
 111 };
 112 enum fieldopenstates {
 113         CLOSED,
 114         OPENED,
 115 };
 116 enum game_states {
 117         GAME_INPROGRESS,
 118         GAME_NEW,
 119         GAME_WON,
 120         GAME_LOST,
 121 };
 122 enum space_modes {
 123         MODE_OPEN,
 124         MODE_FLAG,
 125         MODE_QUESM,
 126 };
 127 enum event {
 128         /* for getctrlseq() */
 129         CTRSEQ_NULL    =  0,
 130         CTRSEQ_EOF     = -1,
 131         CTRSEQ_INVALID = -2,
 132         CTRSEQ_MOUSE   = -3,
 133         /* for getch() */
 134         CTRSEQ_MOUSE_LEFT   = -4,
 135         CTRSEQ_MOUSE_MIDDLE = -5,
 136         CTRSEQ_MOUSE_RIGHT  = -6,
 137         CTRSEQ_CURSOR_LEFT  = -7,
 138         CTRSEQ_CURSOR_DOWN  = -8,
 139         CTRSEQ_CURSOR_UP    = -9,
 140         CTRSEQ_CURSOR_RIGHT = -10,
 141 };
 142 enum mine_types {
 143         NO_MINE,
 144         STD_MINE,
 145         DEATH_MINE,
 146 };
 147
 148 #define CW op.scheme->cell_width
 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*CW-(CW%2)-3-(dtime>999));
 155                 printf ("[%03d]", f.t?dtime:0);
 156                 break;
 157         case SIGINT:
 158                 exit(128+SIGINT);
 159         }
 160 }
 161 #undef CW
 162
 163 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 164 struct termios saved_term_mode;
 165 struct termios set_raw_term_mode() {
 166         struct termios cur_term_mode, raw_term_mode;
 167
 168         tcgetattr(STDIN_FILENO, &cur_term_mode);
 169         raw_term_mode = cur_term_mode;
 170         raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 171         raw_term_mode.c_cc[VMIN] = 1 ;
 172         raw_term_mode.c_cc[VTIME] = 0;
 173         tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 174
 175         return cur_term_mode;
 176 }
 177 void restore_term_mode(struct termios saved_term_mode) {
 178         tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 179 }
 180
 181
 182 int main (int argc, char** argv) {
 183         struct sigaction saction;
 184         saved_term_mode = set_raw_term_mode();
 185
 186         atexit (*quit);
 187
 188         saction.sa_handler = signal_handler;
 189         sigemptyset(&saction.sa_mask);
 190         saction.sa_flags   = 0;
 191         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 192                 perror("SIGALRM");
 193                 exit(1);
 194         }
 195
 196         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 197                 perror ("SIGINT");
 198                 exit (1);
 199         }
 200         /* end screen setup */
 201
 202         op.scheme = &symbols_mono;
 203         op.mode = FLAG;
 204         /* end defaults */
 205         /* parse options */
 206         int optget;
 207         opterr = 0; /* don't print message on unrecognized option */
 208         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
 209                 switch (optget) {
 210                 case 'n': op.mode    = NOFLAG; break;
 211                 case 'f': op.mode    = FLAG; break; /*default*/
 212                 case 'q': op.mode    = QUESM; break;
 213                 case 'c': op.scheme  = &symbols_col1; break;
 214                 case 'd': op.scheme  = &symbols_doublewidth; break;
 215                 case 'h':
 216                 default:
 217                         fprintf (stderr, "%s [OPTIONS] [FIELDSPEC]\n"
 218                         "OPTIONS:\n"
 219                         "    -n(o flagging)\n"
 220                         "    -f(lagging)\n"
 221                         "    -q(uestion marks)\n"
 222                         "    -c(olored symbols)\n"
 223                         "    -d(ec charset symbols)\n"
 224                         "FIELDSPEC:\n"
 225                         "    WxH[xM] (width 'x' height 'x' mines)\n"
 226                         "    defaults to 30x16x99; mines default to ~20%%\n"
 227                         "\n"
 228                         "Keybindings:\n"
 229                         "    hjkl: move left/down/up/right\n"
 230                         "    bduw: move to next boundary\n"
 231                         "    ^Gg$: move to the left/bottom/top/right\n"
 232                         "    o:    open/choord\n"
 233                         "    i:    flag/unflag\n"
 234                         "    space:modeful cursor (either open or flag)\n"
 235                         "    a:    toggle mode for space (open/flag)\n"
 236                         "    mX:   set a mark for letter X\n"
 237                         "    `X:   move to mark X (aliased to ')\n"
 238                         "    r:    start a new game\n"
 239                         "    q:    quit\n", argv[0]);
 240                         _exit(0);
 241                 }
 242         }
 243         /* end parse options*/
 244         if (optind < argc) { /* parse Fieldspec */
 245                 int n = sscanf (argv[optind], "%dx%dx%d", &f.w, &f.h, &f.m);
 246                 struct winsize w;
 247                 ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 248 #define CW op.scheme->cell_width
 249 #define WW w.ws_col /*window width  */
 250 #define WH w.ws_row /*window height */
 251 #define FW f.w      /* field width  */
 252 #define FH f.h      /* field height */
 253 #define MM 231      /* mouse maximum*/
 254 #define LB 2        /*  left border */
 255 #define RB 2        /* right border */
 256 #define TB 3        /*   top border */
 257 #define BB 2        /*bottom border */
 258
 259                 if (LB + FW*CW + RB > WW) FW = WW/CW - (LB+RB);
 260                 if (TB + FH    + BB > WH) FH = WH    - (TB+BB);
 261                 if (LB + FW*CW      > MM) FW = MM/CW - LB;
 262                 if (TB + FH         > MM) FH = MM    - TB;
 263
 264                 if (n < 2) {
 265                         fprintf (stderr, "FIELDSPEC: WxH[xM]"
 266                         " (width 'x' height 'x' mines)\n");
 267                         return 1;
 268                 } else if (n == 2) {
 269                         if (f.w < 30) f.m = f.w*f.h*.15625;
 270                         else f.m = f.w*f.h*.20625;
 271                 }
 272 #undef CW
 273 #undef WW
 274 #undef WH
 275 #undef FW
 276 #undef FH
 277 #undef MM
 278 #undef LB
 279 #undef RB
 280 #undef TB
 281 #undef BB
 282         } else { /* use defaults */
 283                 f.w = 30;
 284                 f.h = 16;
 285                 f.m = 99;
 286         }
 287         /* check boundaries */
 288         if (f.m > (f.w-1) * (f.h-1)) {
 289                 f.m = (f.w-1) * (f.h-1);
 290                 fprintf (stderr, "too many mines. reduced to %d.\r\n", f.m);
 291         }
 292         /* end check */
 293
 294 newgame:
 295         f.c = alloc_array (f.h, f.w);
 296
 297         f.f = 0;
 298         f.t = 0;
 299         f.p[0] = 0;
 300         f.p[1] = 0;
 301
 302         int is_newgame = 1;
 303         int cheatmode = 0;
 304         f.s = MODE_OPEN;
 305         f.o = GAME_NEW;
 306         struct line_col markers[26];
 307         for (int i=26; i; markers[--i].l = -1);
 308
 309         /* switch to alternate screen */
 310         printf ("\033[?47h");
 311         /* reset cursor, clear screen */
 312         printf ("\033[H\033[J");
 313
 314         /* swich charset, if necessary */
 315         if (op.scheme->init_seq != NULL) print (op.scheme->init_seq);
 316
 317         show_minefield (NORMAL);
 318
 319         /* enable mouse, hide cursor */
 320         printf ("\033[?1000h\033[?25l");
 321
 322         while (1) {
 323                 int l, c;
 324                 int action;
 325                 unsigned char mouse[3];
 326
 327                 action = getch(mouse);
 328                 switch (action) {
 329                 case ' ':
 330                         if (f.s == MODE_OPEN ||
 331                             f.c[f.p[0]][f.p[1]].o == OPENED) {
 332                                 switch (do_uncover(&is_newgame)) {
 333                                         case GAME_LOST: goto lose;
 334                                         case GAME_WON:  goto win;
 335                                 }
 336                         } else if (f.s == MODE_FLAG) {
 337                                 flag_square (f.p[0], f.p[1]);
 338                         } else if (f.s ==  MODE_QUESM) {
 339                                 quesm_square (f.p[0], f.p[1]);
 340                         }
 341                         break;
 342                 case 'a':
 343                         f.s = (f.s+1)%(op.mode+1);
 344                         show_minefield (cheatmode?SHOWMINES:NORMAL);
 345                         break;
 346                 case CTRSEQ_MOUSE_LEFT:
 347                         /* :D clicked: TODO: won't work in single-width mode! */
 348                         if (mouse[2] == LINE_OFFSET-1 &&
 349                            (mouse[1] == f.w+COL_OFFSET ||
 350                             mouse[1] == f.w+COL_OFFSET+1)) {
 351                                 free_field ();
 352                                 goto newgame;
 353                         }
 354                         if (screen2field_c (mouse[1]) < 0    ||
 355                             screen2field_c (mouse[1]) >= f.w ||
 356                             screen2field_l (mouse[2]) <  0   ||
 357                             screen2field_l (mouse[2]) >= f.h)   break;
 358                         f.p[0] = screen2field_l (mouse[2]);
 359                         f.p[1] = screen2field_c (mouse[1]);
 360                         /* fallthrough */
 361                 case 'o':
 362                         switch (do_uncover(&is_newgame)) {
 363                                 case GAME_LOST: goto lose;
 364                                 case GAME_WON:  goto win;
 365                         }
 366                         break;
 367                 case CTRSEQ_MOUSE_RIGHT:
 368                         if (screen2field_c (mouse[1]) < 0    ||
 369                             screen2field_c (mouse[1]) >= f.w ||
 370                             screen2field_l (mouse[2]) <  0   ||
 371                             screen2field_l (mouse[2]) >= f.h)   break;
 372                         f.p[0] = screen2field_l (mouse[2]);
 373                         f.p[1] = screen2field_c (mouse[1]);
 374                         /* fallthrough */
 375                 case 'i': flag_square (f.p[0], f.p[1]); break;
 376                 case '?':quesm_square (f.p[0], f.p[1]); break;
 377                 case CTRSEQ_CURSOR_LEFT:
 378                 case 'h': cursor_move (f.p[0],   f.p[1]-1 ); break;
 379                 case CTRSEQ_CURSOR_DOWN:
 380                 case 'j': cursor_move (f.p[0]+1, f.p[1]   ); break;
 381                 case CTRSEQ_CURSOR_UP:
 382                 case 'k': cursor_move (f.p[0]-1, f.p[1]   ); break;
 383                 case CTRSEQ_CURSOR_RIGHT:
 384                 case 'l': cursor_move (f.p[0],   f.p[1]+1 ); break;
 385                 case 'w': to_next_boundary (f.p[0], f.p[1], '>'); break;
 386                 case 'b': to_next_boundary (f.p[0], f.p[1], '<'); break;
 387                 case 'u': to_next_boundary (f.p[0], f.p[1], '^'); break;
 388                 case 'd': to_next_boundary (f.p[0], f.p[1], 'v'); break;
 389                 case '0': /* fallthrough */
 390                 case '^': cursor_move (f.p[0],    0        ); break;
 391                 case '$': cursor_move (f.p[0],    f.w-1    ); break;
 392                 case 'g': cursor_move (0,         f.p[1]   ); break;
 393                 case 'G': cursor_move (f.h-1,     f.p[1]   ); 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                 /* :D clicked: TODO: won't work in single-width mode! */
 437                 if (gotaction==CTRSEQ_MOUSE_LEFT && mouse[2]==LINE_OFFSET-1 &&
 438                    (mouse[1]==f.w+COL_OFFSET || mouse[1]==f.w+COL_OFFSET+1)) {
 439                         free_field ();
 440                         goto newgame;
 441                 } else if (gotaction == 'r') {
 442                         free_field ();
 443                         goto newgame;
 444                 } else if (gotaction == 'q') {
 445                         goto quit;
 446                 }
 447         } while (1);
 448
 449 quit:
 450         return 0;
 451 }
 452
 453 void quit (void) {
 454         //move(0,0); //move(f.h+LINE_OFFSET+2, 0);
 455         printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 456         print (op.scheme->reset_seq); /* reset charset, if necessary */
 457         printf ("\033[?47l");         /* revert to primary screen */
 458         free_field ();
 459         restore_term_mode(saved_term_mode);
 460 }
 461
 462 /* I haven't won as long as a cell exists, that
 463     - I haven't opened, and
 464     - is not a mine */
 465 int everything_opened (void) {
 466         for (int row = 0; row < f.h; row++)
 467                 for (int col = 0; col < f.w; col++)
 468                         if (f.c[row][col].o == CLOSED &&
 469                             f.c[row][col].m == NO_MINE  ) return 0;
 470         return 1;
 471 }
 472
 473 int wait_mouse_up (int l, int c) {
 474         unsigned char mouse2[3];
 475         int level = 1;
 476         int l2, c2;
 477
 478         /* show :o face */
 479         move (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 480
 481         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 482                 /* show a pushed-in button if cursor is on minefield */
 483                 move (l+LINE_OFFSET, field2screen_c(c));
 484                 fputs (op.scheme->mouse_highlight, stdout);
 485         }
 486
 487         while (level > 0) {
 488                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 489                         /* ignore mouse wheel events: */
 490                         if (mouse2[0] & 0x40) continue;
 491
 492                         else if (mouse2[0]&3 == 3) level--; /* release event */
 493                         else level++; /* another button pressed */
 494                 }
 495         }
 496
 497         move (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 498
 499         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 500                 partial_show_minefield (l, c, NORMAL);
 501         }
 502         c2 = screen2field_c(mouse2[1]);
 503         l2 = screen2field_l(mouse2[2]);
 504         return ((l2 == l) && (c2 == c));
 505 }
 506
 507 int choord_square (int line, int col) {
 508         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 509                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 510                         if (f.c[l][c].f != FLAG) {
 511                                 if (uncover_square (l, c))
 512                                          return 1;
 513                         }
 514                 }
 515         }
 516
 517         return 0;
 518 }
 519
 520 int uncover_square (int l, int c) {
 521         f.c[l][c].o = OPENED;
 522         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 523         partial_show_minefield (l, c, NORMAL);
 524
 525         if (f.c[l][c].m) {
 526                 f.c[l][c].m = DEATH_MINE;
 527                 return 1;
 528         }
 529
 530         /* check for chording */
 531         if (f.c[l][c].n == 0) {
 532                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 533                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 534                                 int newl = l + choord_l;
 535                                 int newc = c + choord_c;
 536                                 if (newl >= 0 && newl < f.h &&
 537                                     newc >= 0 && newc < f.w &&
 538                                     f.c[newl][newc].o == CLOSED &&
 539                                     uncover_square (newl, newc)) {
 540                                          return 1;
 541                                 }
 542                         }
 543                 }
 544         }
 545
 546         return 0;
 547 }
 548
 549 void flag_square (int l, int c) {
 550         static char modechar[] = {'*', '!', '?'};
 551
 552         if (f.c[l][c].o != CLOSED) return;
 553         /* cycles through flag/quesm/noflag (uses op.mode to detect which ones
 554         are allowed) */
 555         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 556         if (f.c[l][c].f==FLAG) f.f++;
 557         else f.f--; //WARN: breaks on `-q'!
 558         partial_show_minefield (l, c, NORMAL);
 559         move (1, op.scheme->cell_width);
 560         printf ("[%03d%c]", f.m - f.f, modechar[f.s]);
 561 }
 562
 563 void quesm_square (int l, int c) {
 564         /* toggle question mark / none. won't turn flags into question marks.
 565         unlike flag_square, this function doesn't respect `-q'. */
 566         if      (f.c[l][c].o != CLOSED) return;
 567         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 568         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 569         partial_show_minefield (l, c, NORMAL);
 570 }
 571
 572 int do_uncover (int* is_newgame) {
 573         if (*is_newgame) {
 574                 *is_newgame = 0;
 575                 fill_minefield (f.p[0], f.p[1]);
 576                 timer_setup(1);
 577         }
 578
 579         if (f.c[f.p[0]][f.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 580         if (f.c[f.p[0]][f.p[1]].o == CLOSED) {
 581                 if (uncover_square (f.p[0], f.p[1])) return GAME_LOST;
 582         } else if (get_neighbours (f.p[0], f.p[1], 1) == 0) {
 583                 if (choord_square (f.p[0], f.p[1])) return GAME_LOST;
 584         }
 585         if (everything_opened()) return GAME_WON;
 586
 587         return GAME_INPROGRESS;
 588 }
 589
 590 void fill_minefield (int l, int c) {
 591         srand (time(0));
 592         int mines_set = f.m;
 593         while (mines_set) {
 594                 int line = rand() % f.h;
 595                 int col = rand() % f.w;
 596
 597                 if (f.c[line][col].m) {
 598                 /* skip if field already has a mine */
 599                         continue;
 600                 } else if ((line == l) && (col == c)) {
 601                 /* don't put a mine on the already opened (first click) field */
 602                         continue;
 603                 } else {
 604                         mines_set--;
 605                         f.c[line][col].m = STD_MINE;
 606                 }
 607         }
 608
 609         /* precalculate neighbours */
 610         for (int l=0; l < f.h; l++)
 611                 for (int c=0; c < f.w; c++)
 612                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 613 }
 614
 615 void move (int line, int col) {
 616         printf ("\033[%d;%dH", line+1, col+1);
 617 }
 618
 619 /* absolute coordinates! */
 620 void cursor_move (int l, int c) {
 621         partial_show_minefield (f.p[0], f.p[1], NORMAL);
 622         /* update f.p */
 623         f.p[0] = CLAMP(l, 0, f.h-1);
 624         f.p[1] = CLAMP(c, 0, f.w-1);
 625         move (f.p[0]+LINE_OFFSET, field2screen_c(f.p[1]));
 626         //fputs (op.scheme->mouse_highlight, stdout);
 627
 628         /* invert unless ! or ? (and flag_offset is used in the scheme): */
 629         if (!f.c[f.p[0]][f.p[1]].f || !op.scheme->flag_offset)
 630                 print("\033[7m");
 631         partial_show_minefield (f.p[0], f.p[1], HIGHLIGHT);
 632         print("\033[0m");//un-invert
 633 }
 634
 635 /* to_next_boundary(): move into the supplied direction until a change in open-
 636 state or flag-state is found and move there. falls back to BIG_MOVE. */
 637 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 638         new_ ## X OP ## = BIG_MOVE;\
 639         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 640                 if ((f.c[L ][C ].o<<2 + f.c[L ][C ].f) \
 641                  != (f.c[L1][C1].o<<2 + f.c[L1][C1].f)) {\
 642                         new_ ## X = i OP 1;\
 643                         break;\
 644                 }\
 645         } while(0)
 646 void to_next_boundary (int l, int c, char direction) {
 647         int new_l = l;
 648         int new_c = c;
 649         switch (direction) {
 650         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 651         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 652         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 653         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 654         }
 655
 656         cursor_move (new_l, new_c);
 657 }
 658 #undef FIND_NEXT
 659
 660 char* cell2schema (int l, int c, int mode) {
 661         struct minecell cell = f.c[l][c];
 662         /* move past invert-ctrlsequence when highlighting the cursor: */
 663         int offset = ((mode==HIGHLIGHT)*op.scheme->flag_offset);
 664
 665         if (mode == SHOWMINES) return (
 666                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged+offset:
 667                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 668                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 669                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 670                 cell.o == CLOSED          ? op.scheme->field_closed:
 671                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 672          else return (
 673                 cell.f == FLAG            ? op.scheme->field_flagged+offset:
 674                 cell.f == QUESM           ? op.scheme->field_question+offset:
 675                 cell.o == CLOSED          ? op.scheme->field_closed:
 676                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 677                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 678                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 679 }
 680
 681 void partial_show_minefield (int l, int c, int mode) {
 682         move (l+LINE_OFFSET, field2screen_c(c));
 683
 684         print (cell2schema(l, c, mode));
 685 }
 686
 687 char* get_emoticon(void) {
 688         return f.o==GAME_WON ? EMOT(WON):
 689                f.o==GAME_LOST? EMOT(DEAD):
 690                 EMOT(SMILE);
 691 }
 692
 693 /* https://zserge.com/blog/c-for-loop-tricks.html */
 694 #define print_line(which) \
 695         for (int _break = (printf(BORDER(which,LEFT)), 1); _break; \
 696                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 697 #define print_border(which, width) \
 698         print_line(which) printm (width, BORDER(which,MIDDLE))
 699 void show_minefield (int mode) {
 700         int dtime;
 701         int half_spaces = f.w*op.scheme->cell_width/2;
 702         int left_spaces = MAX(0,half_spaces-7-(f.m-f.f>999)+2);
 703         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 704         static char modechar[] = {'*', '!', '?'};
 705
 706         move (0,0);
 707
 708         dtime = (f.t == 0)?0: difftime (time(NULL), f.t);
 709
 710         print_border(TOP, f.w);
 711         print_line(STATUS) {
 712                 printf("[%03d%c]%*s%*s[%03d]",
 713                   /* [ */ f.m - f.f, modechar[f.s], /* ] */
 714                   left_spaces, get_emoticon(), right_spaces,"",
 715                   /* [ */ dtime /* ] */);
 716         }
 717         print_border(DIVIDER, f.w);
 718         /* main body */
 719         for (int l = 0; l < f.h; l++) print_line(FIELD)
 720                 printm (f.w, cell2schema(l, _loop, mode));
 721         print_border(BOTTOM, f.w);
 722 }
 723
 724 int get_neighbours (int line, int col, int reduced_mode) {
 725         /* counts mines surrounding a square
 726            modes: 0=normal; 1=reduced */
 727
 728         int count = 0;
 729
 730         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 731                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 732                         if (!l && !c) continue;
 733
 734                         count += !!f.c[l][c].m;
 735                         count -= reduced_mode * f.c[l][c].f==FLAG;
 736                 }
 737         }
 738         return count;
 739 }
 740
 741 struct minecell** alloc_array (int lines, int cols) {
 742         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 743         if (a == NULL) return NULL;
 744         for (int l = 0; l < lines; l++) {
 745                 a[l] = calloc (cols, sizeof(struct minecell));
 746                 if (a[l] == NULL) goto unalloc;
 747         }
 748
 749         return a;
 750 unalloc:
 751         for (int l = 0; l < lines; l++)
 752                 free (a[l]);
 753         return NULL;
 754 }
 755
 756 void free_field (void) {
 757         if (f.c == NULL) return;
 758         for (int l = 0; l < f.h; l++) {
 759                 free (f.c[l]);
 760         }
 761
 762         free (f.c);
 763         f.c = NULL;
 764 }
 765
 766 int screen2field_l (int l) {
 767         return (l-LINE_OFFSET) - 1;
 768 }
 769 /* some trickery is required to extract the mouse position from the cell width,
 770 depending on wheather we are using full width characters or double line width.
 771 WARN: tested only with scheme.cell_width = 1 and scheme.cell_width = 2. */
 772 #define CW op.scheme->cell_width
 773 int screen2field_c (int c) {
 774         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 775 }
 776 #undef CW
 777 int field2screen_l (int l) {
 778         return 0; //TODO: is never used, therefore not implemented
 779 }
 780 int field2screen_c (int c) {
 781         return (op.scheme->cell_width*c+COL_OFFSET - (op.scheme->cell_width%2));
 782 }
 783
 784 enum esc_states {
 785         START,
 786         ESC_SENT,
 787         CSI_SENT,
 788         MOUSE_EVENT,
 789 };
 790 int getctrlseq (unsigned char* buf) {
 791         int c;
 792         int state = START;
 793         int offset = 0x20; /* never sends control chars as data */
 794         while ((c = getchar()) != EOF) {
 795                 switch (state) {
 796                 case START:
 797                         switch (c) {
 798                         case '\033': state=ESC_SENT; break;
 799                         default: return c;
 800                         }
 801                         break;
 802                 case ESC_SENT:
 803                         switch (c) {
 804                         case '[': state=CSI_SENT; break;
 805                         default: return CTRSEQ_INVALID;
 806                         }
 807                         break;
 808                 case CSI_SENT:
 809                         switch (c) {
 810                         case 'A': return CTRSEQ_CURSOR_UP;
 811                         case 'B': return CTRSEQ_CURSOR_DOWN;
 812                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 813                         case 'D': return CTRSEQ_CURSOR_LEFT;
 814                         case 'M': state=MOUSE_EVENT; break;
 815                         default: return CTRSEQ_INVALID;
 816                         }
 817                         break;
 818                 case MOUSE_EVENT:
 819                         buf[0] = c - offset;
 820                         buf[1] = getchar() - offset;
 821                         buf[2] = getchar() - offset;
 822                         return CTRSEQ_MOUSE;
 823                 default:
 824                         return CTRSEQ_INVALID;
 825                 }
 826         }
 827         return 2;
 828 }
 829
 830 int getch(unsigned char* buf) {
 831 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 832 compatible with the ncurses implementation of same name */
 833         int action = getctrlseq(buf);
 834         int l, c;
 835         switch (action) {
 836         case CTRSEQ_MOUSE:
 837                 l = screen2field_l (buf[2]);
 838                 c = screen2field_c (buf[1]);
 839
 840                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 841                 int success = wait_mouse_up(l, c);
 842
 843                 /* mouse moved while pressed: */
 844                 if (!success) return CTRSEQ_INVALID;
 845
 846                 switch (buf[0]) {
 847                 case 0: return CTRSEQ_MOUSE_LEFT;
 848                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 849                 case 2: return CTRSEQ_MOUSE_RIGHT;
 850                 }
 851         }
 852
 853         return action;
 854 }
 855
 856 void timer_setup (int enable) {
 857         static struct itimerval tbuf;
 858         tbuf.it_interval.tv_sec  = 1;
 859         tbuf.it_interval.tv_usec = 0;
 860
 861         if (enable) {
 862                 f.t = time(NULL);
 863                 tbuf.it_value.tv_sec  = 1;
 864                 tbuf.it_value.tv_usec = 0;
 865                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 866                         perror("setitimer");
 867                         exit(1);
 868                 }
 869         } else {
 870                 tbuf.it_value.tv_sec  = 0;
 871                 tbuf.it_value.tv_usec = 0;
 872                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 873                         perror("setitimer");
 874                         exit(1);
 875                 }
 876         }
 877
 878 }