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