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