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(n, s) for (int _loop = 0; _loop < n; _loop++) fputs (s, stdout)
  41 #define print(str) fputs (str, stdout)
  42 #define EMOT(e) op.scheme->emoticons[EMOT_ ## e]
  43 #define BORDER(l, c) op.scheme->border[B_ ## l][B_ ## c]
  44
  45 struct minecell {
  46         unsigned m:2; /* mine?1:killmine?2:0 */
  47         unsigned o:1; /* open?1:0 */
  48         unsigned f:2; /* flagged?1:questioned?2:0 */
  49         unsigned n:4; /* 0<= neighbours <=8 */
  50 };
  51 struct minefield {
  52         struct minecell **c;
  53         //TODO: rename w, h to L, C
  54         int w; /* width */
  55         int h; /* height */
  56         int m; /* number of mines */
  57
  58         int f; /* flags counter */
  59         int t; /* time of game start */
  60         int p[2]; /* cursor position {line, col} */
  61         int s; /* space mode */
  62         int o; /* mode */
  63 } f;
  64
  65 struct opt {
  66         struct minescheme* scheme;
  67         int mode; /* allow flags? quesm? */
  68 } op;
  69
  70 struct line_col {
  71         int l;
  72         int c;
  73 };
  74
  75 void fill_minefield (int, int);
  76 void move (int, int);
  77 void cursor_move (int, int);
  78 void to_next_boundary (int l, int c, char direction);
  79 int getch (unsigned char*);
  80 int getctrlseq (unsigned char*);
  81 int everything_opened (void);
  82 int wait_mouse_up (int, int);
  83 void partial_show_minefield (int, int, int);
  84 void show_minefield (int);
  85 int get_neighbours (int, int, int);
  86 int uncover_square (int, int);
  87 void flag_square (int, int);
  88 void quesm_square (int, int);
  89 int choord_square (int, int);
  90 int do_uncover (int*);
  91 struct minecell** alloc_array (int, int);
  92 void free_field (void);
  93 char* get_emoticon(void);
  94 int screen2field_l (int);
  95 int screen2field_c (int);
  96 int field2screen_l (int);
  97 int field2screen_c (int);
  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         saved_term_mode = set_raw_term_mode();
 186
 187         atexit (*quit);
 188
 189         saction.sa_handler = signal_handler;
 190         sigemptyset(&saction.sa_mask);
 191         saction.sa_flags   = 0;
 192         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 193                 perror("SIGALRM");
 194                 exit(1);
 195         }
 196
 197         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 198                 perror ("SIGINT");
 199                 exit (1);
 200         }
 201         /* end screen setup */
 202
 203         op.scheme = &symbols_mono;
 204         op.mode = FLAG;
 205         /* end defaults */
 206         /* parse options */
 207         int optget;
 208         opterr = 0; /* don't print message on unrecognized option */
 209         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
 210                 switch (optget) {
 211                 case 'n': op.mode    = NOFLAG; break;
 212                 case 'f': op.mode    = FLAG; break; /*default*/
 213                 case 'q': op.mode    = QUESM; break;
 214                 case 'c': op.scheme  = &symbols_col1; break;
 215                 case 'd': op.scheme  = &symbols_doublewidth; break;
 216                 case 'h':
 217                 default:
 218                         fprintf (stderr, "%s [OPTIONS] [FIELDSPEC]\n"
 219                         "OPTIONS:\n"
 220                         "    -n(o flagging)\n"
 221                         "    -f(lagging)\n"
 222                         "    -q(uestion marks)\n"
 223                         "    -c(olored symbols)\n"
 224                         "    -d(ec charset symbols)\n"
 225                         "FIELDSPEC:\n"
 226                         "    WxH[xM] (width 'x' height 'x' mines)\n"
 227                         "    defaults to 30x16x99; mines default to ~20%%\n"
 228                         "\n"
 229                         "Keybindings:\n"
 230                         "    hjkl: move left/down/up/right\n"
 231                         "    bduw: move to next boundary\n"
 232                         "    ^Gg$: move to the left/bottom/top/right\n"
 233                         "    o:    open/choord\n"
 234                         "    i:    flag/unflag\n"
 235                         "    space:modeful cursor (either open or flag)\n"
 236                         "    a:    toggle mode for space (open/flag)\n"
 237                         "    mX:   set a mark for letter X\n"
 238                         "    `X:   move to mark X (aliased to ')\n"
 239                         "    r:    start a new game\n"
 240                         "    q:    quit\n", argv[0]);
 241                         _exit(0);
 242                 }
 243         }
 244         /* end parse options*/
 245         if (optind < argc) { /* parse Fieldspec */
 246                 int n = sscanf (argv[optind], "%dx%dx%d", &f.w, &f.h, &f.m);
 247                 struct winsize w;
 248                 ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 249 #define CW op.scheme->cell_width
 250 #define WW w.ws_col /*window width  */
 251 #define WH w.ws_row /*window height */
 252 #define FW f.w      /* field width  */
 253 #define FH f.h      /* field height */
 254 #define MM 231      /* mouse maximum*/
 255 #define LB 2        /*  left border */
 256 #define RB 2        /* right border */
 257 #define TB 3        /*   top border */
 258 #define BB 2        /*bottom border */
 259
 260                 if (LB + FW*CW + RB > WW) FW = WW/CW - (LB+RB);
 261                 if (TB + FH    + BB > WH) FH = WH    - (TB+BB);
 262                 if (LB + FW*CW      > MM) FW = MM/CW - LB;
 263                 if (TB + FH         > MM) FH = MM    - TB;
 264
 265                 if (n < 2) {
 266                         fprintf (stderr, "FIELDSPEC: WxH[xM]"
 267                         " (width 'x' height 'x' mines)\n");
 268                         return 1;
 269                 } else if (n == 2) {
 270                         if (f.w < 30) f.m = f.w*f.h*.15625;
 271                         else f.m = f.w*f.h*.20625;
 272                 }
 273 #undef CW
 274 #undef WW
 275 #undef WH
 276 #undef FW
 277 #undef FH
 278 #undef MM
 279 #undef LB
 280 #undef RB
 281 #undef TB
 282 #undef BB
 283         } else { /* use defaults */
 284                 f.w = 30;
 285                 f.h = 16;
 286                 f.m = 99;
 287         }
 288         /* check boundaries */
 289         if (f.m > (f.w-1) * (f.h-1)) {
 290                 f.m = (f.w-1) * (f.h-1);
 291                 fprintf (stderr, "too many mines. reduced to %d.\r\n", f.m);
 292         }
 293         /* end check */
 294
 295 newgame:
 296         f.c = alloc_array (f.h, f.w);
 297
 298         f.f = 0;
 299         f.t = 0;
 300         f.p[0] = 0;
 301         f.p[1] = 0;
 302
 303         int is_newgame = 1;
 304         int cheatmode = 0;
 305         f.s = MODE_OPEN;
 306         f.o = GAME_NEW;
 307         struct line_col markers[26];
 308         for (int i=26; i; markers[--i].l = -1);
 309
 310         /* switch to alternate screen */
 311         printf ("\033[?47h");
 312         /* reset cursor, clear screen */
 313         printf ("\033[H\033[J");
 314
 315         /* swich charset, if necessary */
 316         if (op.scheme->init_seq != NULL) print (op.scheme->init_seq);
 317
 318         show_minefield (NORMAL);
 319
 320         /* enable mouse, hide cursor */
 321         printf ("\033[?1000h\033[?25l");
 322
 323         while (1) {
 324                 int l, c;
 325                 int action;
 326                 unsigned char mouse[3];
 327
 328                 action = getch(mouse);
 329                 switch (action) {
 330                 case ' ':
 331                         if (f.s == MODE_OPEN ||
 332                             f.c[f.p[0]][f.p[1]].o == OPENED) {
 333                                 switch (do_uncover(&is_newgame)) {
 334                                         case GAME_LOST: goto lose;
 335                                         case GAME_WON:  goto win;
 336                                 }
 337                         } else if (f.s == MODE_FLAG) {
 338                                 flag_square (f.p[0], f.p[1]);
 339                         } else if (f.s ==  MODE_QUESM) {
 340                                 quesm_square (f.p[0], f.p[1]);
 341                         }
 342                         break;
 343                 case 'a':
 344                         f.s = (f.s+1)%(op.mode+1);
 345                         show_minefield (cheatmode?SHOWMINES:NORMAL);
 346                         break;
 347                 case CTRSEQ_MOUSE_LEFT:
 348                         f.p[0] = screen2field_l (mouse[2]);
 349                         f.p[1] = screen2field_c (mouse[1]);
 350                         /* :D clicked: TODO: won't work in single-width mode! */
 351                         if (mouse[2] == LINE_OFFSET-1 &&
 352                            (mouse[1] == f.w+COL_OFFSET ||
 353                             mouse[1] == f.w+COL_OFFSET+1)) {
 354                                 free_field ();
 355                                 goto newgame;
 356                         }
 357                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 358                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 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                         f.p[0] = screen2field_l (mouse[2]);
 368                         f.p[1] = screen2field_c (mouse[1]);
 369                         if (f.p[1] < 0 || f.p[1] >= f.w ||
 370                             f.p[0] < 0 || f.p[0] >= f.h) break; /*out of bound*/
 371                         /* fallthrough */
 372                 case 'i': flag_square (f.p[0], f.p[1]); break;
 373                 case '?':quesm_square (f.p[0], f.p[1]); break;
 374                 case CTRSEQ_CURSOR_LEFT:
 375                 case 'h': cursor_move (f.p[0],   f.p[1]-1 ); break;
 376                 case CTRSEQ_CURSOR_DOWN:
 377                 case 'j': cursor_move (f.p[0]+1, f.p[1]   ); break;
 378                 case CTRSEQ_CURSOR_UP:
 379                 case 'k': cursor_move (f.p[0]-1, f.p[1]   ); break;
 380                 case CTRSEQ_CURSOR_RIGHT:
 381                 case 'l': cursor_move (f.p[0],   f.p[1]+1 ); break;
 382                 case 'w': to_next_boundary (f.p[0], f.p[1], '>'); break;
 383                 case 'b': to_next_boundary (f.p[0], f.p[1], '<'); break;
 384                 case 'u': to_next_boundary (f.p[0], f.p[1], '^'); break;
 385                 case 'd': to_next_boundary (f.p[0], f.p[1], 'v'); break;
 386                 case '0': /* fallthrough */
 387                 case '^': cursor_move (f.p[0],    0        ); break;
 388                 case '$': cursor_move (f.p[0],    f.w-1    ); break;
 389                 case 'g': cursor_move (0,         f.p[1]   ); break;
 390                 case 'G': cursor_move (f.h-1,     f.p[1]   ); break;
 391                 case 'm':
 392                         action = tolower(getch(mouse));
 393                         if (action < 'a' || action > 'z') break;/*out of bound*/
 394                         markers[action-'a'].l = f.p[0];
 395                         markers[action-'a'].c = f.p[1];
 396                         break;
 397                 case'\'': /* fallthrough */
 398                 case '`':
 399                         action = tolower(getch(mouse));
 400                         if (action < 'a' || action > 'z' /* out of bound or */
 401                             || markers[action-'a'].l == -1) break; /* unset */
 402                         cursor_move (markers[action-'a'].l, markers[action-'a'].c);
 403                         break;
 404                 case 'r': /* start a new game */
 405                         free_field ();
 406                         goto newgame;
 407                 case 'q':
 408                         goto quit;
 409                 case '\014': /* Ctrl-L -- redraw */
 410                         show_minefield (NORMAL);
 411                         break;
 412                 case '\\':
 413                         if (is_newgame) {
 414                                 is_newgame = 0;
 415                                 fill_minefield (-1, -1);
 416                                 timer_setup(1);
 417                         }
 418                         show_minefield (cheatmode?NORMAL:SHOWMINES);
 419                         cheatmode = !cheatmode;
 420                         break;
 421                 }
 422         }
 423
 424 win:
 425         f.o = GAME_WON;
 426         goto endgame;
 427 lose:
 428         f.o = GAME_LOST;
 429         goto endgame;
 430 endgame:
 431         timer_setup(0); /* stop timer */
 432         show_minefield (SHOWMINES);
 433         int gotaction;
 434         do {
 435                 unsigned char mouse[3];
 436                 gotaction = getch(mouse);
 437                 /* :D clicked: TODO: won't work in single-width mode! */
 438                 if (gotaction==CTRSEQ_MOUSE_LEFT && mouse[2]==LINE_OFFSET-1 &&
 439                    (mouse[1]==f.w+COL_OFFSET || mouse[1]==f.w+COL_OFFSET+1)) {
 440                         free_field ();
 441                         goto newgame;
 442                 } else if (gotaction == 'r') {
 443                         free_field ();
 444                         goto newgame;
 445                 } else if (gotaction == 'q') {
 446                         goto quit;
 447                 }
 448         } while (1);
 449
 450 quit:
 451         return 0;
 452 }
 453
 454 void quit (void) {
 455         //move(0,0); //move(f.h+LINE_OFFSET+2, 0);
 456         /* disable mouse, show cursor */
 457         printf ("\033[?9l\033[?25h");
 458         /* reset charset, if necessary */
 459         if (op.scheme && op.scheme->reset_seq) print (op.scheme->reset_seq);
 460         /* revert to primary screen */
 461         printf ("\033[?47l");
 462         free_field ();
 463         restore_term_mode(saved_term_mode);
 464 }
 465
 466 /* I haven't won as long as a cell exists, that
 467     - I haven't opened, and
 468     - is not a mine */
 469 int everything_opened (void) {
 470         for (int row = 0; row < f.h; row++)
 471                 for (int col = 0; col < f.w; col++)
 472                         if (f.c[row][col].o == CLOSED &&
 473                                 f.c[row][col].m == NO_MINE  ) return 0;
 474         return 1;
 475 }
 476
 477 int wait_mouse_up (int l, int c) {
 478         unsigned char mouse2[3];
 479         int level = 1;
 480         int l2, c2;
 481
 482         /* show :o face */
 483         move (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 484
 485         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 486                 /* show a pushed-in button if cursor is on minefield */
 487                 move (l+LINE_OFFSET, field2screen_c(c));
 488                 fputs (op.scheme->mouse_highlight, stdout);
 489         }
 490
 491         while (level > 0) {
 492                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 493                         /* ignore mouse wheel events: */
 494                         if (mouse2[0] & 0x40) continue;
 495
 496                         else if (mouse2[0]&3 == 3) level--; /* release event */
 497                         else level++; /* another button pressed */
 498                 }
 499         }
 500
 501         move (1, field2screen_c (f.w/2)-1);
 502         print (get_emoticon());
 503
 504         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 505                 partial_show_minefield (l, c, NORMAL);
 506         }
 507         c2 = screen2field_c(mouse2[1]);
 508         l2 = screen2field_l(mouse2[2]);
 509         return ((l2 == l) && (c2 == c));
 510 }
 511
 512 int choord_square (int line, int col) {
 513         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 514                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 515                         if (f.c[l][c].f != FLAG) {
 516                                 if (uncover_square (l, c))
 517                                          return 1;
 518                         }
 519                 }
 520         }
 521
 522         return 0;
 523 }
 524
 525 int uncover_square (int l, int c) {
 526         f.c[l][c].o = OPENED;
 527         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 528         partial_show_minefield (l, c, NORMAL);
 529
 530         if (f.c[l][c].m) {
 531                 f.c[l][c].m = DEATH_MINE;
 532                 return 1;
 533         }
 534
 535         /* check for chording */
 536         if (f.c[l][c].n == 0) {
 537                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 538                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 539                                 int newl = l + choord_l;
 540                                 int newc = c + choord_c;
 541                                 if (newl >= 0 && newl < f.h &&
 542                                     newc >= 0 && newc < f.w &&
 543                                     f.c[newl][newc].o == CLOSED &&
 544                                     uncover_square (newl, newc)) {
 545                                          return 1;
 546                                 }
 547                         }
 548                 }
 549         }
 550
 551         return 0;
 552 }
 553
 554 void flag_square (int l, int c) {
 555         static char modechar[] = {'*', '!', '?'};
 556
 557         if (f.c[l][c].o != CLOSED) return;
 558         /* cycles through flag/quesm/noflag (uses op.mode to detect which ones
 559         are allowed) */
 560         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 561         if (f.c[l][c].f==FLAG) f.f++;
 562         else f.f--; //WARN: breaks on `-q'!
 563         partial_show_minefield (l, c, NORMAL);
 564         move (1, op.scheme->cell_width);
 565         printf ("[%03d%c]", f.m - f.f, modechar[f.s]);
 566 }
 567
 568 void quesm_square (int l, int c) {
 569         /* toggle question mark / none. won't turn flags into question marks.
 570         unlike flag_square, this function doesn't respect `-q'. */
 571         if      (f.c[l][c].o != CLOSED) return;
 572         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 573         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 574         partial_show_minefield (l, c, NORMAL);
 575 }
 576
 577 int do_uncover (int* is_newgame) {
 578         if (*is_newgame) {
 579                 *is_newgame = 0;
 580                 fill_minefield (f.p[0], f.p[1]);
 581                 timer_setup(1);
 582         }
 583
 584         if (f.c[f.p[0]][f.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 585         if (f.c[f.p[0]][f.p[1]].o == CLOSED) {
 586                 if (uncover_square (f.p[0], f.p[1])) return GAME_LOST;
 587         } else if (get_neighbours (f.p[0], f.p[1], 1) == 0) {
 588                 if (choord_square (f.p[0], f.p[1])) return GAME_LOST;
 589         }
 590         if (everything_opened()) return GAME_WON;
 591
 592         return GAME_INPROGRESS;
 593 }
 594
 595 void fill_minefield (int l, int c) {
 596         srand (time(0));
 597         int mines_set = f.m;
 598         while (mines_set) {
 599                 int line = rand() % f.h;
 600                 int col = rand() % f.w;
 601
 602                 if (f.c[line][col].m) {
 603                 /* skip if field already has a mine */
 604                         continue;
 605                 } else if ((line == l) && (col == c)) {
 606                 /* don't put a mine on the already opened (first click) field */
 607                         continue;
 608                 } else {
 609                         mines_set--;
 610                         f.c[line][col].m = STD_MINE;
 611                 }
 612         }
 613
 614         /* precalculate neighbours */
 615         for (int l=0; l < f.h; l++)
 616                 for (int c=0; c < f.w; c++)
 617                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 618 }
 619
 620 void move (int line, int col) {
 621         printf ("\033[%d;%dH", line+1, col+1);
 622 }
 623
 624 /* absolute coordinates! */
 625 void cursor_move (int l, int c) {
 626         partial_show_minefield (f.p[0], f.p[1], NORMAL);
 627         /* update f.p */
 628         f.p[0] = CLAMP(l, 0, f.h-1);
 629         f.p[1] = CLAMP(c, 0, f.w-1);
 630         move (f.p[0]+LINE_OFFSET, field2screen_c(f.p[1]));
 631         //fputs (op.scheme->mouse_highlight, stdout);
 632
 633         /* invert unless ! or ? (and flag_offset is used in the scheme): */
 634         if (!f.c[f.p[0]][f.p[1]].f || !op.scheme->flag_offset)
 635                 print("\033[7m");
 636         partial_show_minefield (f.p[0], f.p[1], HIGHLIGHT);
 637         print("\033[0m");//un-invert
 638 }
 639
 640 /* to_next_boundary(): move into the supplied direction until a change in open-
 641 state or flag-state is found and move there. falls back to BIG_MOVE. */
 642 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 643         new_ ## X OP ## = BIG_MOVE;\
 644         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 645                 if ((f.c[L ][C ].o<<2 + f.c[L ][C ].f) \
 646                  != (f.c[L1][C1].o<<2 + f.c[L1][C1].f)) {\
 647                         new_ ## X = i OP 1;\
 648                         break;\
 649                 }\
 650         } while(0)
 651 void to_next_boundary (int l, int c, char direction) {
 652         int new_l = l;
 653         int new_c = c;
 654         switch (direction) {
 655         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 656         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 657         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 658         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 659         }
 660
 661         cursor_move (new_l, new_c);
 662 }
 663 #undef FIND_NEXT
 664
 665 char* cell2schema (int l, int c, int mode) {
 666         struct minecell cell = f.c[l][c];
 667         /* move past invert-ctrlsequence when highlighting the cursor: */
 668         int offset = ((mode==HIGHLIGHT)*op.scheme->flag_offset);
 669
 670         if (mode == SHOWMINES) return (
 671                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged+offset:
 672                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 673                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 674                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 675                 cell.o == CLOSED          ? op.scheme->field_closed:
 676                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 677          else return (
 678                 cell.f == FLAG            ? op.scheme->field_flagged+offset:
 679                 cell.f == QUESM           ? op.scheme->field_question+offset:
 680                 cell.o == CLOSED          ? op.scheme->field_closed:
 681                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 682                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 683                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 684 }
 685
 686 void partial_show_minefield (int l, int c, int mode) {
 687         move (l+LINE_OFFSET, field2screen_c(c));
 688
 689         print (cell2schema(l, c, mode));
 690 }
 691
 692 char* get_emoticon(void) {
 693         return f.o==GAME_WON ? EMOT(WON):
 694                f.o==GAME_LOST? EMOT(DEAD):
 695                 EMOT(SMILE);
 696 }
 697
 698 /* https://zserge.com/blog/c-for-loop-tricks.html */
 699 #define print_line(which) \
 700         for (int _break = (printf(BORDER(which,LEFT)), 1); _break; \
 701                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 702 #define print_border(which, width) \
 703         print_line(which) printm (width, BORDER(which,MIDDLE))
 704 void show_minefield (int mode) {
 705         int dtime;
 706         int half_spaces = f.w*op.scheme->cell_width/2;
 707         int left_spaces = MAX(0,half_spaces-7-(f.m-f.f>999)+2);
 708         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 709         static char modechar[] = {'*', '!', '?'};
 710
 711         move (0,0);
 712
 713         dtime = (f.t == 0)?0: difftime (time(NULL), f.t);
 714
 715         print_border(TOP, f.w);
 716         print_line(STATUS) {
 717                 printf("[%03d%c]%*s%*s[%03d]",
 718                   /* [ */ f.m - f.f, modechar[f.s], /* ] */
 719                   left_spaces, get_emoticon(), right_spaces,"",
 720                   /* [ */ dtime /* ] */);
 721         }
 722         print_border(DIVIDER, f.w);
 723         /* main body */
 724         for (int l = 0; l < f.h; l++) print_line(FIELD)
 725                 printm (f.w, cell2schema(l, _loop, mode));
 726         print_border(BOTTOM, f.w);
 727 }
 728
 729 int get_neighbours (int line, int col, int reduced_mode) {
 730         /* counts mines surrounding a square
 731            modes: 0=normal; 1=reduced */
 732
 733         int count = 0;
 734
 735         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 736                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 737                         if (!l && !c) continue;
 738
 739                         count += !!f.c[l][c].m;
 740                         count -= reduced_mode * f.c[l][c].f==FLAG;
 741                 }
 742         }
 743         return count;
 744 }
 745
 746 struct minecell** alloc_array (int lines, int cols) {
 747         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 748         if (a == NULL) return NULL;
 749         for (int l = 0; l < lines; l++) {
 750                 a[l] = calloc (cols, sizeof(struct minecell));
 751                 if (a[l] == NULL) goto unalloc;
 752         }
 753
 754         return a;
 755 unalloc:
 756         for (int l = 0; l < lines; l++)
 757                 free (a[l]);
 758         return NULL;
 759 }
 760
 761 void free_field (void) {
 762         if (f.c == NULL) return;
 763         for (int l = 0; l < f.h; l++) {
 764                 free (f.c[l]);
 765         }
 766
 767         free (f.c);
 768         f.c = NULL;
 769 }
 770
 771 int screen2field_l (int l) {
 772         return (l-LINE_OFFSET) - 1;
 773 }
 774 /* some trickery is required to extract the mouse position from the cell width,
 775 depending on wheather we are using full width characters or double line width.
 776 WARN: tested only with scheme.cell_width = 1 and scheme.cell_width = 2. */
 777 #define CW op.scheme->cell_width
 778 int screen2field_c (int c) {
 779         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 780 }
 781 #undef CW
 782 int field2screen_l (int l) {
 783         return 0; //TODO: is never used, therefore not implemented
 784 }
 785 int field2screen_c (int c) {
 786         return (op.scheme->cell_width*c+COL_OFFSET - (op.scheme->cell_width%2));
 787 }
 788
 789 enum esc_states {
 790         START,
 791         ESC_SENT,
 792         CSI_SENT,
 793         MOUSE_EVENT,
 794 };
 795 int getctrlseq (unsigned char* buf) {
 796         int c;
 797         int state = START;
 798         int offset = 0x20; /* never sends control chars as data */
 799         while ((c = getchar()) != EOF) {
 800                 switch (state) {
 801                 case START:
 802                         switch (c) {
 803                         case '\033': state=ESC_SENT; break;
 804                         default: return c;
 805                         }
 806                         break;
 807                 case ESC_SENT:
 808                         switch (c) {
 809                         case '[': state=CSI_SENT; break;
 810                         default: return CTRSEQ_INVALID;
 811                         }
 812                         break;
 813                 case CSI_SENT:
 814                         switch (c) {
 815                         case 'A': return CTRSEQ_CURSOR_UP;
 816                         case 'B': return CTRSEQ_CURSOR_DOWN;
 817                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 818                         case 'D': return CTRSEQ_CURSOR_LEFT;
 819                         case 'M': state=MOUSE_EVENT; break;
 820                         default: return CTRSEQ_INVALID;
 821                         }
 822                         break;
 823                 case MOUSE_EVENT:
 824                         buf[0] = c - offset;
 825                         buf[1] = getchar() - offset;
 826                         buf[2] = getchar() - offset;
 827                         return CTRSEQ_MOUSE;
 828                 default:
 829                         return CTRSEQ_INVALID;
 830                 }
 831         }
 832         return 2;
 833 }
 834
 835 int getch(unsigned char* buf) {
 836 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 837 compatible with the ncurses implementation of same name */
 838         int action = getctrlseq(buf);
 839         int l, c;
 840         switch (action) {
 841         case CTRSEQ_MOUSE:
 842                 l = screen2field_l (buf[2]);
 843                 c = screen2field_c (buf[1]);
 844
 845                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 846                 int success = wait_mouse_up(l, c);
 847
 848                 /* mouse moved while pressed: */
 849                 if (!success) return CTRSEQ_INVALID;
 850
 851                 switch (buf[0]) {
 852                 case 0: return CTRSEQ_MOUSE_LEFT;
 853                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 854                 case 2: return CTRSEQ_MOUSE_RIGHT;
 855                 }
 856         }
 857
 858         return action;
 859 }
 860
 861 void timer_setup (int enable) {
 862         static struct itimerval tbuf;
 863         tbuf.it_interval.tv_sec  = 1;
 864         tbuf.it_interval.tv_usec = 0;
 865
 866         if (enable) {
 867                 f.t = time(NULL);
 868                 tbuf.it_value.tv_sec  = 1;
 869                 tbuf.it_value.tv_usec = 0;
 870                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 871                         perror("setitimer");
 872                         exit(1);
 873                 }
 874         } else {
 875                 tbuf.it_value.tv_sec  = 0;
 876                 tbuf.it_value.tv_usec = 0;
 877                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 878                         perror("setitimer");
 879                         exit(1);
 880                 }
 881         }
 882
 883 }