mines.c

   1 /*******************************************************************************
   2  minesviiper 0.4
   3  By Tobias Girstmair, 2015 - 2018
   4
   5  ./minesviiper 16x16x40
   6  (see ./minesviiper -h for full list of options)
   7
   8  MOUSE MODE: - left click to open and choord
   9              - right click to flag/unflag
  10  VI MODE:    - hjkl to move cursor left/down/up/right
  11              - o/space to open and choord
  12              - i to flag/unflag
  13              - (see `./minesviiper -h' for all keybindings)
  14
  15  GNU GPL v3, see LICENSE or https://www.gnu.org/licenses/gpl-3.0.txt
  16 *******************************************************************************/
  17
  18
  19 #define _POSIX_C_SOURCE 2 /*for getopt, sigaction in c99*/
  20 #include <ctype.h>
  21 #include <poll.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <sys/ioctl.h>
  26 #include <sys/time.h>
  27 #include <termios.h>
  28 #include <time.h>
  29 #include <unistd.h>
  30
  31 #include "mines.h"
  32 #include "schemes.h"
  33
  34 #define LINE_OFFSET 3
  35 #define LINES_AFTER 2
  36 #define COL_OFFSET 2
  37 #define BIG_MOVE 5
  38 #define MOUSE_MAX 231
  39 #define STOMP_TIMEOUT 150 /*ms*/
  40
  41 #define MIN(a,b) (a>b?b:a)
  42 #define MAX(a,b) (a>b?a:b)
  43 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
  44 #define printm(n, s) for (int _loop = 0; _loop < n; _loop++) fputs (s, stdout)
  45 #define print(str) fputs (str?str:"", stdout)
  46 #define EMOT(e) op.scheme->emoticons[EMOT_ ## e]
  47 #define BORDER(l, c) op.scheme->border[B_ ## l][B_ ## c]
  48 #define CW op.scheme->cell_width /* for brevity */
  49 #define HI_CELL f.c[g.p[0]][g.p[1]]
  50 #define CTRL_ 0x1F &
  51
  52 #define AR_CELL f.c[ROW][COL] /* helper for AROUND() */
  53 #define AROUND(l, c) /* gives us loop-variables ROW, COL, AR_CELL */ \
  54         for (int ROW = MAX(l-1, 0); ROW <= MIN(l+1, f.h-1); ROW++) \
  55                 for (int COL = MAX(c-1, 0); COL <= MIN(c+1, f.w-1); COL++) \
  56                         if (!(ROW == l && COL == c)) /* skip itself */
  57
  58 struct minefield f;
  59 struct game g;
  60 struct opt op;
  61
  62 int main (int argc, char** argv) {
  63         /* defaults: */
  64         f.w = 30;
  65         f.h = 16;
  66         f.m = 99;
  67         op.scheme = &symbols_mono;
  68         op.mode = FLAG;
  69
  70         int optget;
  71         opterr = 0; /* don't print message on unrecognized option */
  72         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
  73                 switch (optget) {
  74                 case 'n': op.mode    = NOFLAG; break;
  75                 case 'f': op.mode    = FLAG; break; /*default*/
  76                 case 'q': op.mode    = QUESM; break; /*WARN:implicitly sets -f*/
  77                 case 'c': op.scheme  = &symbols_col1; break;
  78                 case 'd': op.scheme  = &symbols_doublewidth; break;
  79                 case 'h':
  80                 default:
  81                         fprintf (stderr, SHORTHELP LONGHELP, argv[0]);
  82                         return !(optget=='h');
  83                 }
  84         } if (optind < argc) { /* parse Fieldspec */
  85                 if (parse_fieldspec (argv[optind])) {
  86                         fprintf (stderr, SHORTHELP FIELDHELP, argv[0]);
  87                         return 1;
  88                 }
  89         }
  90
  91         signal_setup();
  92         screen_setup(1);
  93         atexit (*quit);
  94
  95 newgame:
  96         switch (minesviiper()) {
  97         case GAME_NEW: goto newgame;
  98         case GAME_WON: g.o = GAME_WON; break;
  99         case GAME_LOST:g.o = GAME_LOST;break;
 100         case GAME_QUIT:goto quit;
 101         }
 102
 103         timer_setup(0); /* stop timer */
 104         show_minefield (SHOWMINES);
 105         for(;;) {
 106                 switch(getch_wrapper()) {
 107                 case WRAPPER_EMOTICON:
 108                 case 'r': goto newgame;
 109                 case 'q': goto quit;
 110                 case CTRL_'R':
 111                         interactive_resize();
 112                         goto newgame;
 113                 }
 114         }
 115
 116 quit:
 117         return 0;
 118 }
 119
 120 int minesviiper(void) {
 121         f.c = alloc_array (f.h, f.w);
 122         g = (const struct game){0}; /* reset all game-specific parameters */
 123
 124         show_minefield (NORMAL);
 125
 126         for(;;) {
 127                 int actor = KEYBOARD; /* WARN: feels like a hack :| */
 128                 switch (getch_wrapper()) {
 129                 case ' ':
 130                         if (HI_CELL.o == OPENED) goto open_cell;
 131                         if (g.s == MODE_OPEN)  goto open_cell;
 132                         if (g.s == MODE_FLAG)  goto flag_cell;
 133                         if (g.s == MODE_QUESM) goto quesm_cell;
 134                         break;
 135                 case 'a':
 136                         g.s = (g.s+1)%(op.mode+1);
 137                         show_minefield (g.c?SHOWMINES:NORMAL);
 138                         break;
 139                 case CTRSEQ_MOUSE_LEFT:
 140                         actor = MOUSE;
 141                         /* fallthrough */
 142                 open_cell:
 143                 case 'o':
 144                         switch (do_uncover(&(g.n), actor)) {
 145                                 case GAME_LOST: return GAME_LOST;
 146                                 case GAME_WON:  return GAME_WON;
 147                         }
 148                         break;
 149                 flag_cell:
 150                 case CTRSEQ_MOUSE_RIGHT:
 151                 case 'i': flag_square (g.p[0], g.p[1]); break;
 152                 quesm_cell:
 153                 case '?':quesm_square (g.p[0], g.p[1]); break;
 154                 case CTRSEQ_CURSOR_LEFT:
 155                 case 'h': move_hi (g.p[0],   g.p[1]-1); break;
 156                 case CTRSEQ_CURSOR_DOWN:
 157                 case 'j': move_hi (g.p[0]+1, g.p[1]  ); break;
 158                 case CTRSEQ_CURSOR_UP:
 159                 case 'k': move_hi (g.p[0]-1, g.p[1]  ); break;
 160                 case CTRSEQ_CURSOR_RIGHT:
 161                 case 'l': move_hi (g.p[0],   g.p[1]+1); break;
 162                 case 'w': to_next_boundary (g.p[0], g.p[1], '>'); break;
 163                 case 'b': to_next_boundary (g.p[0], g.p[1], '<'); break;
 164                 case 'u': to_next_boundary (g.p[0], g.p[1], '^'); break;
 165                 case 'd': to_next_boundary (g.p[0], g.p[1], 'v'); break;
 166                 case '0': /* fallthrough */
 167                 case '^': move_hi (g.p[0],    0        ); break;
 168                 case '$': move_hi (g.p[0],    f.w-1    ); break;
 169                 case 'g': move_hi (0,         g.p[1]   ); break;
 170                 case 'G': move_hi (f.h-1,     g.p[1]   ); break;
 171                 case 'z': move_hi (f.h/2, f.w/2); break;
 172                 case 'm': set_mark(); break;
 173                 case'\'': /* fallthrough */
 174                 case '`': jump_mark(); break;
 175                 case WRAPPER_EMOTICON:
 176                 case 'r': timer_setup(0); return GAME_NEW;
 177                 case 'q': return GAME_QUIT;
 178                 case CTRL_'L':
 179                         screen_setup(1);
 180                         show_minefield (NORMAL);
 181                         break;
 182                 case CTRL_'R':
 183                         timer_setup(0);
 184                         interactive_resize();
 185                         return GAME_NEW;
 186                 case '\\':
 187                         if (g.n == GAME_NEW) break; /* must open a cell first */
 188                         g.c = !g.c;
 189                         show_minefield (g.c?SHOWMINES:NORMAL);
 190                         break;
 191                 }
 192         }
 193
 194 }
 195
 196 void quit (void) {
 197         screen_setup(0);
 198         free_field ();
 199 }
 200
 201 /* I haven't won as long as a cell exists, that
 202     - I haven't opened, and
 203     - is not a mine */
 204 int everything_opened (void) {
 205         for (int row = 0; row < f.h; row++)
 206                 for (int col = 0; col < f.w; col++)
 207                         if (f.c[row][col].o == CLOSED &&
 208                             f.c[row][col].m == NO_MINE  ) return 0;
 209         return 1;
 210 }
 211
 212 int wait_mouse_up (int l, int c) { /* TODO: should not take minefield-coords but absolute ones */
 213         unsigned char mouse2[3];
 214         int level = 1;
 215         int l2, c2;
 216
 217         /* show :o face */
 218         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 219
 220         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 221                 /* show a pushed-in button if cursor is on minefield */
 222                 redraw_cell (l, c, HIGHLIGHT);
 223
 224                 show_stomp(1, l, c);
 225         }
 226
 227         while (level > 0) {
 228                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 229                         /* ignore mouse wheel events: */
 230                         if (mouse2[0] & 0x40) continue;
 231
 232                         else if (mouse2[0]&3 == 3) level--; /* release event */
 233                         else level++; /* another button pressed */
 234                 }
 235         }
 236
 237         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 238
 239         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 240                 redraw_cell (l, c, NORMAL);
 241                 show_stomp(0, l, c);
 242         }
 243         c2 = screen2field_c(mouse2[1]);
 244         l2 = screen2field_l(mouse2[2]);
 245         return ((l2 == l) && (c2 == c));
 246 }
 247
 248 int choord_square (int line, int col) {
 249         if (uncover_square (line, col)) return 1;
 250         AROUND(line,col)
 251                 if (AR_CELL.f != FLAG) {
 252                         if (uncover_square (ROW, COL))
 253                                  return 1;
 254                 }
 255
 256         return 0;
 257 }
 258
 259 int uncover_square (int l, int c) {
 260         if (f.c[l][c].o == OPENED)
 261                 return 0; /* nothing to do */
 262
 263         f.c[l][c].o = OPENED;
 264         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 265         redraw_cell (l, c, NORMAL);
 266
 267         if (f.c[l][c].m) {
 268                 f.c[l][c].m = DEATH_MINE;
 269                 return 1;
 270         }
 271
 272         /* check for chording */
 273         if (f.c[l][c].n == 0) {
 274                 AROUND(l, c)
 275                         if (uncover_square (ROW, COL)) return 1;
 276         }
 277
 278         return 0;
 279 }
 280
 281 void flag_square (int l, int c) {
 282         static char modechar[] = {'*', '!', '?'};
 283
 284         if (f.c[l][c].o != CLOSED) return;
 285         /* cycle through flag/quesm/noflag: */
 286         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 287         if (f.c[l][c].f==FLAG) g.f++;
 288         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 289                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 290         redraw_cell (l, c, NORMAL);
 291         move_ph (1, op.scheme->cell_width);
 292         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 293 }
 294
 295 void quesm_square (int l, int c) {
 296         /* toggle question mark / none. won't turn flags into question marks.
 297         unlike flag_square, this function doesn't respect `-q'. */
 298         if      (f.c[l][c].o != CLOSED) return;
 299         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 300         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 301         redraw_cell (l, c, NORMAL);
 302 }
 303
 304 int do_uncover (int* is_newgame, int actor) {
 305         if (*is_newgame == GAME_NEW) {
 306                 *is_newgame = GAME_INPROGRESS;
 307                 fill_minefield (g.p[0], g.p[1]);
 308                 timer_setup(1);
 309         }
 310
 311         if (HI_CELL.f == FLAG  ) return GAME_INPROGRESS;
 312         if (HI_CELL.o == CLOSED) {
 313                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 314         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 315                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 316         } else if (actor != MOUSE) {
 317                 show_stomp(1, g.p[0], g.p[1]);
 318
 319                 wait_stomp();
 320
 321                 show_stomp(0, g.p[0], g.p[1]);
 322         }
 323         if (everything_opened()) return GAME_WON;
 324
 325         return GAME_INPROGRESS;
 326 }
 327
 328 void set_mark(void) {
 329         int mark = tolower(getch_wrapper());
 330         if (mark < 'a' || mark > 'z') return; /*out of bound*/
 331
 332         g.m[mark-'a'].l = g.p[0];
 333         g.m[mark-'a'].c = g.p[1];
 334         g.m[mark-'a'].s = 1;
 335 }
 336
 337 void jump_mark(void) {
 338         int mark = tolower(getch_wrapper());
 339         /* check bounds and if set: */
 340         if (mark < 'a' || mark > 'z' || !g.m[mark-'a'].s) return;
 341         move_hi (g.m[mark-'a'].l, g.m[mark-'a'].c);
 342 }
 343
 344 void fill_minefield (int l, int c) {
 345         srand (time(0));
 346         int mines_set = f.m;
 347         while (mines_set) {
 348                 int line = rand() % f.h;
 349                 int col = rand() % f.w;
 350
 351                 if (f.c[line][col].m) {
 352                 /* skip if field already has a mine */
 353                         continue;
 354                 } else if ((line == l) && (col == c)) {
 355                 /* don't put a mine on the already opened (first click) field */
 356                         continue;
 357                 } else {
 358                         mines_set--;
 359                         f.c[line][col].m = STD_MINE;
 360                 }
 361         }
 362
 363         /* precalculate neighbours */
 364         for (int l=0; l < f.h; l++)
 365                 for (int c=0; c < f.w; c++)
 366                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 367 }
 368
 369 void move_ph (int line, int col) {
 370         /* move printhead to zero-indexed position */
 371         printf ("\033[%d;%dH", line+1, col+1);
 372 }
 373
 374 void move_hi (int l, int c) {
 375         /* move cursor and highlight to absolute coordinates */
 376
 377         redraw_cell (g.p[0], g.p[1], NORMAL);
 378         /* update g.p */
 379         g.p[0] = CLAMP(l, 0, f.h-1);
 380         g.p[1] = CLAMP(c, 0, f.w-1);
 381         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 382
 383         redraw_cell (g.p[0], g.p[1], HIGHLIGHT);
 384 }
 385
 386 /* to_next_boundary(): move into the supplied direction until a change in open-
 387 state or flag-state is found and move there. falls back to BIG_MOVE. */
 388 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 389         new_ ## X OP ## = BIG_MOVE;\
 390         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 391                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 392                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 393                         new_ ## X = i OP 1;\
 394                         break;\
 395                 }\
 396         } while(0)
 397 void to_next_boundary (int l, int c, char direction) {
 398         int new_l = l;
 399         int new_c = c;
 400         switch (direction) {
 401         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 402         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 403         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 404         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 405         }
 406
 407         move_hi (new_l, new_c);
 408 }
 409 #undef FIND_NEXT
 410
 411 char* cell2schema (int l, int c, int mode) {
 412         struct minecell cell = f.c[l][c];
 413
 414         if (mode == SHOWMINES) return (
 415                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 416                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 417                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 418                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 419                 cell.o == CLOSED          ? op.scheme->field_closed:
 420                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 421          else return (
 422                 cell.f == FLAG            ? op.scheme->field_flagged:
 423                 cell.f == QUESM           ? op.scheme->field_question:
 424                 cell.o == CLOSED          ? op.scheme->field_closed:
 425                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 426                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 427                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 428 }
 429
 430 void redraw_cell (int l, int c, int mode) {
 431         move_ph (l+LINE_OFFSET, field2screen_c(c));
 432         if (mode == HIGHLIGHT) printf ("\033[7m"); /* reverse video */
 433         print (cell2schema(l, c, mode));
 434         if (mode == HIGHLIGHT) printf ("\033[0m"); /* reset all */
 435 }
 436
 437 char* get_emoticon(void) {
 438         return g.o==GAME_WON ? EMOT(WON):
 439                g.o==GAME_LOST? EMOT(DEAD):
 440                 EMOT(SMILE);
 441 }
 442
 443 /* https://zserge.com/blog/c-for-loop-tricks.html */
 444 #define print_line(which) \
 445         for (int _break = (printf("%s", BORDER(which,LEFT)), 1); _break; \
 446                 _break = 0, printf("%s\r\n", BORDER(which,RIGHT)))
 447 #define print_border(which, width) \
 448         print_line(which) printm (width, BORDER(which,MIDDLE))
 449 void show_minefield (int mode) {
 450         //TODO: in `-d' mode if f.w is odd we are 1 char short in the status line
 451         //TODO: in `-d' mode we need to specify a charset to print lowercase (-> resize mode)
 452         int dtime = difftime (time(NULL), g.t)*!!g.t;
 453         int half_spaces = f.w*op.scheme->cell_width/2;
 454         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 455         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 456         static char modechar[] = {'*', '!', '?'};
 457
 458         move_ph (0,0);
 459
 460         print_border(TOP, f.w);
 461         print_line(STATUS) {
 462                 if (mode == RESIZEMODE) printf ("%-*s", 2*half_spaces,
 463                   f.w*CW>53?"Resize Mode: HJKL to resize, Enter to set, Q to abort":
 464                   f.w*CW>25?"Resize Mode: HJKL/Enter/Q":"HJKL/Enter/Q");
 465                 else printf("[%03d%c]%*s%s%*s[%03d]",
 466                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 467                   left_spaces,"", get_emoticon(), right_spaces,"",
 468                   /* [ */ dtime /* ] */);
 469         }
 470         print_border(DIVIDER, f.w);
 471         /* main body */
 472         for (int l = 0; l < f.h; l++) print_line(FIELD)
 473                 printm (f.w, cell2schema(l, _loop, mode));
 474         print_border(BOTTOM, f.w);
 475 }
 476
 477 void show_stomp (int enable, int l, int c) {
 478         if (enable) {
 479                 if (f.c[l][c].o == OPENED && get_neighbours (l, c, 1) != 0) {
 480                         /* show the stomp radius if we aren't fully flagged */
 481                         AROUND(l, c)
 482                                 if (AR_CELL.o == CLOSED && AR_CELL.f != FLAG)
 483                                         redraw_cell (ROW, COL, HIGHLIGHT);
 484                         fflush(stdout); /* won't display without */
 485
 486                 }
 487         } else {
 488                 AROUND(l, c) redraw_cell (ROW, COL, NORMAL);
 489         }
 490 }
 491
 492 void wait_stomp (void) {
 493         /* block SIGALRM, otherwise poll gets cancelled by the timer: */
 494         sigset_t sig;
 495         sigemptyset (&sig);
 496         sigaddset(&sig, SIGALRM);
 497         sigprocmask (SIG_BLOCK, &sig, NULL);
 498
 499         /* wait for timout or keypress: */
 500         struct pollfd fds;
 501         fds.fd = 0; fds.events = POLLIN;
 502         poll(&fds, 1, STOMP_TIMEOUT);
 503
 504         /* restore signal mask: */
 505         sigprocmask (SIG_UNBLOCK, &sig, NULL);
 506 }
 507
 508 int get_neighbours (int line, int col, int reduced_mode) {
 509         /* counts mines surrounding a square
 510            modes: 0=normal; 1=reduced */
 511
 512         int count = 0;
 513         AROUND(line, col) {
 514                 count += !!AR_CELL.m;
 515                 count -= reduced_mode * AR_CELL.f==FLAG;
 516         }
 517         return count;
 518 }
 519
 520 void interactive_resize(void) {
 521         unsigned char buf[3];
 522         int old_w = f.w;
 523         int old_h = f.h;
 524         for(;;) {
 525                 screen_setup(1); /* clears the screen */
 526                 show_minefield (RESIZEMODE);
 527                 /* show the new field size in the corner: */
 528                 move_ph(f.h+LINE_OFFSET-1,COL_OFFSET);
 529                 printf("%d x %d", f.w, f.h);
 530
 531                 free_field(); /* must free before resizing! */
 532                 switch (getctrlseq(buf)) {
 533                 case CTRSEQ_CURSOR_LEFT: case 'h': f.w--; break;
 534                 case CTRSEQ_CURSOR_DOWN: case 'j': f.h++; break;
 535                 case CTRSEQ_CURSOR_UP:   case 'k': f.h--; break;
 536                 case CTRSEQ_CURSOR_RIGHT:case 'l': f.w++; break;
 537                 case 'w': f.w+=BIG_MOVE; break;
 538                 case 'b': f.w-=BIG_MOVE; break;
 539                 case 'u': f.h-=BIG_MOVE; break;
 540                 case 'd': f.h+=BIG_MOVE; break;
 541                 case 0xa: return; /* enter */
 542                 case 'q': /* abort */
 543                         f.w = old_w;
 544                         f.h = old_h;
 545                         screen_setup(1);
 546                         return;
 547                 }
 548
 549                 clamp_fieldsize();
 550                 f.m = mines_percentage(f.w, f.h);
 551                 f.c = alloc_array (f.h, f.w);
 552         }
 553 }
 554
 555 struct minecell** alloc_array (int lines, int cols) {
 556         free_field (); /* NOTE: this feels like a hack :| */
 557         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 558         if (a == NULL) return NULL;
 559         for (int l = 0; l < lines; l++) {
 560                 a[l] = calloc (cols, sizeof(struct minecell));
 561                 if (a[l] == NULL) goto unalloc;
 562         }
 563
 564         return a;
 565 unalloc:
 566         for (int l = 0; l < lines; l++)
 567                 free (a[l]);
 568         return NULL;
 569 }
 570
 571 void free_field (void) {
 572         if (f.c == NULL) return;
 573         for (int l = 0; l < f.h; l++) {
 574                 free (f.c[l]);
 575         }
 576
 577         free (f.c);
 578         f.c = NULL;
 579 }
 580
 581 int screen2field_l (int l) {
 582         return (l-LINE_OFFSET) - 1;
 583 }
 584 int screen2field_c (int c) {
 585         /* this depends on the cell width and only works when it is 1 or 2. */
 586         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 587 }
 588 int field2screen_c (int c) {
 589         return (CW*c+COL_OFFSET - (CW%2));
 590 }
 591 int clicked_emoticon (unsigned char* mouse) {
 592         return (mouse[2] == LINE_OFFSET-1 && (
 593                 mouse[1] == f.w+COL_OFFSET ||
 594                 mouse[1] == f.w+COL_OFFSET+1));
 595 }
 596
 597 enum esc_states {
 598         START,
 599         ESC_SENT,
 600         CSI_SENT,
 601         MOUSE_EVENT,
 602 };
 603 int getctrlseq (unsigned char* buf) {
 604         int c;
 605         int state = START;
 606         int offset = 0x20; /* never sends control chars as data */
 607         while ((c = getchar()) != EOF) {
 608                 switch (state) {
 609                 case START:
 610                         switch (c) {
 611                         case '\033': state=ESC_SENT; break;
 612                         default: return c;
 613                         }
 614                         break;
 615                 case ESC_SENT:
 616                         switch (c) {
 617                         case '[': state=CSI_SENT; break;
 618                         default: return CTRSEQ_INVALID;
 619                         }
 620                         break;
 621                 case CSI_SENT:
 622                         switch (c) {
 623                         case 'A': return CTRSEQ_CURSOR_UP;
 624                         case 'B': return CTRSEQ_CURSOR_DOWN;
 625                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 626                         case 'D': return CTRSEQ_CURSOR_LEFT;
 627                         case 'M': state=MOUSE_EVENT; break;
 628                         default: return CTRSEQ_INVALID;
 629                         }
 630                         break;
 631                 case MOUSE_EVENT:
 632                         buf[0] = c - offset;
 633                         buf[1] = getchar() - offset;
 634                         buf[2] = getchar() - offset;
 635                         return CTRSEQ_MOUSE;
 636                 default:
 637                         return CTRSEQ_INVALID;
 638                 }
 639         }
 640         return 2;
 641 }
 642
 643 int getch(unsigned char* buf) {
 644 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 645 compatible with the ncurses implementation of same name */
 646         int action = getctrlseq(buf);
 647         int l, c;
 648         switch (action) {
 649         case CTRSEQ_MOUSE:
 650                 l = screen2field_l (buf[2]);
 651                 c = screen2field_c (buf[1]);
 652
 653                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 654                 int success = wait_mouse_up(l, c);
 655
 656                 /* mouse moved while pressed: */
 657                 if (!success) return CTRSEQ_INVALID;
 658
 659                 switch (buf[0]) {
 660                 case 0: return CTRSEQ_MOUSE_LEFT;
 661                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 662                 case 2: return CTRSEQ_MOUSE_RIGHT;
 663                 }
 664         }
 665
 666         return action;
 667 }
 668
 669 int getch_wrapper (void) {
 670         unsigned char mouse[3];
 671         int c = getch(mouse);
 672
 673         if (c == CTRSEQ_MOUSE_LEFT || c == CTRSEQ_MOUSE_RIGHT) {
 674                 if (clicked_emoticon(mouse))
 675                         return WRAPPER_EMOTICON;
 676
 677                 if (screen2field_c (mouse[1]) < 0
 678                  || screen2field_c (mouse[1]) >= f.w
 679                  || screen2field_l (mouse[2]) < 0
 680                  || screen2field_l (mouse[2]) >= f.h)
 681                         return CTRSEQ_INVALID;
 682
 683                 g.p[0] = screen2field_l (mouse[2]);
 684                 g.p[1] = screen2field_c (mouse[1]);
 685
 686                 return c; /* CTRSEQ_MOUSE_LEFT || CTRSEQ_MOUSE_RIGHT */
 687         }
 688
 689         return c;
 690 }
 691
 692 void clamp_fieldsize (void) {
 693         /* clamp field size to terminal size and mouse maximum: */
 694         struct winsize w;
 695         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 696
 697         if (f.w < 1) f.w = 1;
 698         if (f.h < 1) f.h = 1;
 699
 700         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 701                 f.w = (w.ws_col - COL_OFFSET - COL_OFFSET)/CW; //TODO: does not work in `-d' (in xterm)
 702         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 703                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 704         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 705                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 706         if (LINE_OFFSET + f.h > MOUSE_MAX)
 707                 f.h = MOUSE_MAX - LINE_OFFSET;
 708 }
 709
 710 int mines_percentage(int w, int h) {
 711         return w*h*(w*h<30*16?.15625:.20625);
 712 }
 713
 714 int parse_fieldspec(char* str) {
 715         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 716         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 717
 718         clamp_fieldsize();
 719
 720         if (n < 2) {
 721                 return 1; /* error */
 722         } else if (n == 2) {
 723                 f.m = mines_percentage(f.w, f.h);
 724         }
 725
 726         f.m = MIN(f.m, (f.w-1) * (f.h-1)); /* limit mines */
 727
 728         return 0;
 729 }
 730
 731 void timer_setup (int enable) {
 732         static struct itimerval tbuf;
 733         tbuf.it_interval.tv_sec  = 1;
 734         tbuf.it_interval.tv_usec = 0;
 735
 736         if (enable) {
 737                 g.t = time(NULL);
 738                 tbuf.it_value.tv_sec  = 1;
 739                 tbuf.it_value.tv_usec = 0;
 740                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 741                         perror("setitimer");
 742                         exit(1);
 743                 }
 744         } else {
 745                 tbuf.it_value.tv_sec  = 0;
 746                 tbuf.it_value.tv_usec = 0;
 747                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 748                         perror("setitimer");
 749                         exit(1);
 750                 }
 751         }
 752
 753 }
 754
 755 void signal_setup (void) {
 756         struct sigaction saction;
 757
 758         saction.sa_handler = signal_handler;
 759         sigemptyset(&saction.sa_mask);
 760         saction.sa_flags   = 0;
 761         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 762                 perror("SIGALRM");
 763                 exit(1);
 764         }
 765
 766         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 767                 perror ("SIGINT");
 768                 exit (1);
 769         }
 770 }
 771
 772 void signal_handler (int signum) {
 773         int dtime;
 774         switch (signum) {
 775         case SIGALRM:
 776                 dtime = difftime (time(NULL), g.t);
 777                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 778                 printf ("[%03d]", g.t?dtime:0);
 779                 break;
 780         case SIGINT:
 781                 exit(128+SIGINT);
 782         }
 783 }
 784
 785 void screen_setup (int enable) {
 786         if (enable) {
 787                 raw_mode(1);
 788                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 789                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 790                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 791                 print (op.scheme->init_seq); /* swich charset, if necessary */
 792         } else {
 793                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 794                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 795                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 796                 raw_mode(0);
 797         }
 798 }
 799
 800 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 801 void raw_mode(int enable) {
 802         static struct termios saved_term_mode;
 803         struct termios raw_term_mode;
 804
 805         if (enable) {
 806                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 807                 raw_term_mode = saved_term_mode;
 808                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 809                 raw_term_mode.c_cc[VMIN] = 1 ;
 810                 raw_term_mode.c_cc[VTIME] = 0;
 811                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 812         } else {
 813                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 814         }
 815 }