mines.c

   1 /*******************************************************************************
   2  minesviiper 0.3.145926
   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
  48 struct minefield f;
  49 struct game g;
  50 struct opt op;
  51
  52 int main (int argc, char** argv) {
  53         /* defaults: */
  54         f.w = 30;
  55         f.h = 16;
  56         f.m = 99;
  57         op.scheme = &symbols_mono;
  58         op.mode = FLAG;
  59
  60         int optget;
  61         opterr = 0; /* don't print message on unrecognized option */
  62         while ((optget = getopt (argc, argv, "+hnfqcdx")) != -1) {
  63                 switch (optget) {
  64                 case 'n': op.mode    = NOFLAG; break;
  65                 case 'f': op.mode    = FLAG; break; /*default*/
  66                 case 'q': op.mode    = QUESM; break;
  67                 case 'c': op.scheme  = &symbols_col1; break;
  68                 case 'd': op.scheme  = &symbols_doublewidth; break;
  69                 case 'h':
  70                 default:
  71                         fprintf (stderr, SHORTHELP LONGHELP, argv[0]);
  72                         return !(optget=='h');
  73                 }
  74         } if (optind < argc) { /* parse Fieldspec */
  75                 if (parse_fieldspec (argv[optind])) {
  76                         fprintf (stderr, "FIELDSPEC: WxH[xM]"
  77                         " (width 'x' height 'x' mines)\n");
  78                         return 1;
  79                 }
  80         }
  81
  82         signal_setup();
  83         screen_setup(1);
  84         atexit (*quit);
  85
  86         /* check boundaries */
  87         if (f.m > (f.w-1) * (f.h-1)) {
  88                 move_ph (LINE_OFFSET+f.h+LINES_AFTER-1,0);
  89                 f.m = (f.w-1) * (f.h-1);
  90                 fprintf (stdout, "too many mines. reduced to %d.\r\n", f.m); //TODO: doesn't show up
  91         }
  92         /* end check */
  93
  94 newgame:
  95         switch (minesviiper()) {
  96         case GAME_NEW: goto newgame;
  97         case GAME_WON: g.o = GAME_WON; break;
  98         case GAME_LOST:g.o = GAME_LOST;break;
  99         }
 100
 101         timer_setup(0); /* stop timer */
 102         show_minefield (SHOWMINES);
 103         int gotaction;
 104         do {
 105                 unsigned char mouse[3];
 106                 gotaction = getch(mouse);
 107                 if (gotaction==CTRSEQ_MOUSE_LEFT && clicked_emoticon(mouse)) {
 108                         free_field ();
 109                         goto newgame;
 110                 } else if (gotaction == 'r') {
 111                         free_field ();
 112                         goto newgame;
 113                 } else if (gotaction == 'q') {
 114                         goto quit;
 115                 }
 116         } while (1);
 117
 118 quit:
 119         return 0;
 120 }
 121
 122 int minesviiper(void) {
 123         f.c = alloc_array (f.h, f.w);
 124         g = (const struct game){0}; /* reset all game-specific parameters */
 125         for (int i=26; i; g.m[--i].l = -1);
 126
 127         show_minefield (NORMAL);
 128
 129         while (1) {
 130                 int action;
 131
 132                 action = getch_wrapper();
 133                 switch (action) {
 134                 case ' ':
 135                         if (g.s == MODE_OPEN ||
 136                             f.c[g.p[0]][g.p[1]].o == OPENED) {
 137                                 switch (do_uncover(&(g.n))) {
 138                                         case GAME_LOST: return GAME_LOST;
 139                                         case GAME_WON:  return GAME_WON;
 140                                 }
 141                         } else if (g.s == MODE_FLAG) {
 142                                 flag_square (g.p[0], g.p[1]);
 143                         } else if (g.s ==  MODE_QUESM) {
 144                                 quesm_square (g.p[0], g.p[1]); }
 145                         break;
 146                 case 'a':
 147                         g.s = (g.s+1)%(op.mode+1);
 148                         show_minefield (g.c?SHOWMINES:NORMAL);
 149                         break;
 150                 case CTRSEQ_MOUSE_LEFT:
 151                 case 'o':
 152                         switch (do_uncover(&(g.n))) {
 153                                 case GAME_LOST: return GAME_LOST;
 154                                 case GAME_WON:  return GAME_WON;
 155                         }
 156                         break;
 157                 case CTRSEQ_MOUSE_RIGHT:
 158                 case 'i': flag_square (g.p[0], g.p[1]); break;
 159                 case '?':quesm_square (g.p[0], g.p[1]); break;
 160                 case CTRSEQ_CURSOR_LEFT:
 161                 case 'h': move_hi (g.p[0],   g.p[1]-1 ); break;
 162                 case CTRSEQ_CURSOR_DOWN:
 163                 case 'j': move_hi (g.p[0]+1, g.p[1]   ); break;
 164                 case CTRSEQ_CURSOR_UP:
 165                 case 'k': move_hi (g.p[0]-1, g.p[1]   ); break;
 166                 case CTRSEQ_CURSOR_RIGHT:
 167                 case 'l': move_hi (g.p[0],   g.p[1]+1 ); break;
 168                 case 'w': to_next_boundary (g.p[0], g.p[1], '>'); break;
 169                 case 'b': to_next_boundary (g.p[0], g.p[1], '<'); break;
 170                 case 'u': to_next_boundary (g.p[0], g.p[1], '^'); break;
 171                 case 'd': to_next_boundary (g.p[0], g.p[1], 'v'); break;
 172                 case '0': /* fallthrough */
 173                 case '^': move_hi (g.p[0],    0        ); break;
 174                 case '$': move_hi (g.p[0],    f.w-1    ); break;
 175                 case 'g': move_hi (0,         g.p[1]   ); break;
 176                 case 'G': move_hi (f.h-1,     g.p[1]   ); break;
 177                 case 'z': move_hi (f.h/2, f.w/2); break;
 178                 case 'm':
 179                         action = tolower(getch_wrapper());
 180                         if (action < 'a' || action > 'z') break;/*out of bound*/
 181                         g.m[action-'a'].l = g.p[0];
 182                         g.m[action-'a'].c = g.p[1];
 183                         break;
 184                 case'\'': /* fallthrough */
 185                 case '`':
 186                         action = tolower(getch_wrapper());
 187                         if (action < 'a' || action > 'z' /* out of bound or */
 188                             || g.m[action-'a'].l == -1) break; /* unset */
 189                         move_hi (g.m[action-'a'].l, g.m[action-'a'].c);
 190                         break;
 191                 case WRAPPER_EMOTICON:
 192                 case 'r': /* start a new game */
 193                         free_field ();
 194                         return GAME_NEW;
 195                 case 'q':
 196                         return GAME_QUIT;
 197                 case '\014': /* Ctrl-L -- redraw */
 198                         show_minefield (NORMAL);
 199                         break;
 200                 case '\\':
 201                         if (g.n == GAME_NEW) break; /* must open a cell first */
 202                         show_minefield (g.c?NORMAL:SHOWMINES);
 203                         g.c = !g.c;
 204                         break;
 205                 }
 206         }
 207
 208 }
 209
 210 void quit (void) {
 211         screen_setup(0);
 212         free_field ();
 213 }
 214
 215 /* I haven't won as long as a cell exists, that
 216     - I haven't opened, and
 217     - is not a mine */
 218 int everything_opened (void) {
 219         for (int row = 0; row < f.h; row++)
 220                 for (int col = 0; col < f.w; col++)
 221                         if (f.c[row][col].o == CLOSED &&
 222                             f.c[row][col].m == NO_MINE  ) return 0;
 223         return 1;
 224 }
 225
 226 int wait_mouse_up (int l, int c) {
 227         unsigned char mouse2[3];
 228         int level = 1;
 229         int l2, c2;
 230
 231         /* show :o face */
 232         move_ph (1, field2screen_c (f.w/2)-1); print (EMOT(OHH));
 233
 234         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 235                 /* show a pushed-in button if cursor is on minefield */
 236                 move_ph (l+LINE_OFFSET, field2screen_c(c));
 237                 fputs (op.scheme->mouse_highlight, stdout);
 238         }
 239
 240         while (level > 0) {
 241                 if (getctrlseq (mouse2) == CTRSEQ_MOUSE) {
 242                         /* ignore mouse wheel events: */
 243                         if (mouse2[0] & 0x40) continue;
 244
 245                         else if (mouse2[0]&3 == 3) level--; /* release event */
 246                         else level++; /* another button pressed */
 247                 }
 248         }
 249
 250         move_ph (1, field2screen_c (f.w/2)-1); print (get_emoticon());
 251
 252         if (!(l < 0 || l >= f.h || c < 0 || c >= f.w)) {
 253                 partial_show_minefield (l, c, NORMAL);
 254         }
 255         c2 = screen2field_c(mouse2[1]);
 256         l2 = screen2field_l(mouse2[2]);
 257         return ((l2 == l) && (c2 == c));
 258 }
 259
 260 int choord_square (int line, int col) {
 261         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 262                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 263                         if (f.c[l][c].f != FLAG) {
 264                                 if (uncover_square (l, c))
 265                                          return 1;
 266                         }
 267                 }
 268         }
 269
 270         return 0;
 271 }
 272
 273 int uncover_square (int l, int c) {
 274         f.c[l][c].o = OPENED;
 275         f.c[l][c].f = NOFLAG; /*must not be QUESM, otherwise rendering issues*/
 276         partial_show_minefield (l, c, NORMAL);
 277
 278         if (f.c[l][c].m) {
 279                 f.c[l][c].m = DEATH_MINE;
 280                 return 1;
 281         }
 282
 283         /* check for chording */
 284         if (f.c[l][c].n == 0) {
 285                 for (int choord_l = -1; choord_l <= 1; choord_l++) {
 286                         for (int choord_c = -1; choord_c <= 1; choord_c++) {
 287                                 int newl = l + choord_l;
 288                                 int newc = c + choord_c;
 289                                 if (newl >= 0 && newl < f.h &&
 290                                     newc >= 0 && newc < f.w &&
 291                                     f.c[newl][newc].o == CLOSED &&
 292                                     uncover_square (newl, newc)) {
 293                                          return 1;
 294                                 }
 295                         }
 296                 }
 297         }
 298
 299         return 0;
 300 }
 301
 302 void flag_square (int l, int c) {
 303         static char modechar[] = {'*', '!', '?'};
 304
 305         if (f.c[l][c].o != CLOSED) return;
 306         /* cycle through flag/quesm/noflag: */
 307         f.c[l][c].f = (f.c[l][c].f + 1) % (op.mode + 1);
 308         if (f.c[l][c].f==FLAG) g.f++;
 309         else if ((op.mode==FLAG  && f.c[l][c].f==NOFLAG) ||
 310                  (op.mode==QUESM && f.c[l][c].f==QUESM)) g.f--;
 311         partial_show_minefield (l, c, NORMAL);
 312         move_ph (1, op.scheme->cell_width);
 313         printf ("[%03d%c]", f.m - g.f, modechar[g.s]);
 314 }
 315
 316 void quesm_square (int l, int c) {
 317         /* toggle question mark / none. won't turn flags into question marks.
 318         unlike flag_square, this function doesn't respect `-q'. */
 319         if      (f.c[l][c].o != CLOSED) return;
 320         else if (f.c[l][c].f == NOFLAG) f.c[l][c].f = QUESM;
 321         else if (f.c[l][c].f == QUESM)  f.c[l][c].f = NOFLAG;
 322         partial_show_minefield (l, c, NORMAL);
 323 }
 324
 325 int do_uncover (int* is_newgame) {
 326         if (*is_newgame == GAME_NEW) {
 327                 *is_newgame = GAME_INPROGRESS;
 328                 fill_minefield (g.p[0], g.p[1]);
 329                 timer_setup(1);
 330         }
 331
 332         if (f.c[g.p[0]][g.p[1]].f == FLAG  ) return GAME_INPROGRESS;
 333         if (f.c[g.p[0]][g.p[1]].o == CLOSED) {
 334                 if (uncover_square (g.p[0], g.p[1])) return GAME_LOST;
 335         } else if (get_neighbours (g.p[0], g.p[1], 1) == 0) {
 336                 if (choord_square (g.p[0], g.p[1])) return GAME_LOST;
 337         }
 338         if (everything_opened()) return GAME_WON;
 339
 340         return GAME_INPROGRESS;
 341 }
 342
 343 void fill_minefield (int l, int c) {
 344         srand (time(0));
 345         int mines_set = f.m;
 346         while (mines_set) {
 347                 int line = rand() % f.h;
 348                 int col = rand() % f.w;
 349
 350                 if (f.c[line][col].m) {
 351                 /* skip if field already has a mine */
 352                         continue;
 353                 } else if ((line == l) && (col == c)) {
 354                 /* don't put a mine on the already opened (first click) field */
 355                         continue;
 356                 } else {
 357                         mines_set--;
 358                         f.c[line][col].m = STD_MINE;
 359                 }
 360         }
 361
 362         /* precalculate neighbours */
 363         for (int l=0; l < f.h; l++)
 364                 for (int c=0; c < f.w; c++)
 365                         f.c[l][c].n = get_neighbours (l, c, NORMAL);
 366 }
 367
 368 void move_ph (int line, int col) {
 369         /* move printhead to zero-indexed position */
 370         printf ("\033[%d;%dH", line+1, col+1);
 371 }
 372
 373 void move_hi (int l, int c) {
 374         /* move cursor and highlight to absolute coordinates */
 375
 376         partial_show_minefield (g.p[0], g.p[1], NORMAL);
 377         /* update g.p */
 378         g.p[0] = CLAMP(l, 0, f.h-1);
 379         g.p[1] = CLAMP(c, 0, f.w-1);
 380         move_ph (g.p[0]+LINE_OFFSET, field2screen_c(g.p[1]));
 381
 382         print("\033[7m"); /* reverse video */
 383         partial_show_minefield (g.p[0], g.p[1], HIGHLIGHT);
 384         print("\033[0m"); /* un-invert */
 385 }
 386
 387 /* to_next_boundary(): move into the supplied direction until a change in open-
 388 state or flag-state is found and move there. falls back to BIG_MOVE. */
 389 #define FIND_NEXT(X, L, C, L1, C1, MAX, OP) do {\
 390         new_ ## X OP ## = BIG_MOVE;\
 391         for (int i = X OP 1; i > 0 && i < f.MAX-1; i OP ## OP)\
 392                 if (((f.c[L ][C ].o<<2) + f.c[L ][C ].f) \
 393                  != ((f.c[L1][C1].o<<2) + f.c[L1][C1].f)) {\
 394                         new_ ## X = i OP 1;\
 395                         break;\
 396                 }\
 397         } while(0)
 398 void to_next_boundary (int l, int c, char direction) {
 399         int new_l = l;
 400         int new_c = c;
 401         switch (direction) {
 402         case '>': FIND_NEXT(c, l, i, l, i+1, w, +); break;
 403         case '<': FIND_NEXT(c, l, i, l, i-1, w, -); break;
 404         case '^': FIND_NEXT(l, i, c, i-1, c, h, -); break;
 405         case 'v': FIND_NEXT(l, i, c, i+1, c, h, +); break;
 406         }
 407
 408         move_hi (new_l, new_c);
 409 }
 410 #undef FIND_NEXT
 411
 412 char* cell2schema (int l, int c, int mode) {
 413         struct minecell cell = f.c[l][c];
 414
 415         if (mode == SHOWMINES) return (
 416                 cell.f == FLAG &&  cell.m ? op.scheme->field_flagged:
 417                 cell.f == FLAG && !cell.m ? op.scheme->mine_wrongf:
 418                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 419                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 420                 cell.o == CLOSED          ? op.scheme->field_closed:
 421                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 422          else return (
 423                 cell.f == FLAG            ? op.scheme->field_flagged:
 424                 cell.f == QUESM           ? op.scheme->field_question:
 425                 cell.o == CLOSED          ? op.scheme->field_closed:
 426                 cell.m == STD_MINE        ? op.scheme->mine_normal:
 427                 cell.m == DEATH_MINE      ? op.scheme->mine_death:
 428                 /*.......................*/ op.scheme->number[f.c[l][c].n]);
 429 }
 430
 431 void partial_show_minefield (int l, int c, int mode) {
 432         move_ph (l+LINE_OFFSET, field2screen_c(c));
 433
 434         print (cell2schema(l, c, mode));
 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         int dtime = difftime (time(NULL), g.t)*!!g.t;
 451         int half_spaces = f.w*op.scheme->cell_width/2;
 452         int left_spaces = MAX(0,half_spaces-7-(f.m-g.f>999));
 453         int right_spaces = MAX(0,half_spaces-6-(dtime>999));
 454         static char modechar[] = {'*', '!', '?'};
 455
 456         move_ph (0,0);
 457
 458         print_border(TOP, f.w);
 459         print_line(STATUS) {
 460                 printf("[%03d%c]%*s%s%*s[%03d]",
 461                   /* [ */ f.m - g.f, modechar[g.s], /* ] */
 462                   left_spaces,"", get_emoticon(), right_spaces,"",
 463                   /* [ */ dtime /* ] */);
 464         }
 465         print_border(DIVIDER, f.w);
 466         /* main body */
 467         for (int l = 0; l < f.h; l++) print_line(FIELD)
 468                 printm (f.w, cell2schema(l, _loop, mode));
 469         print_border(BOTTOM, f.w);
 470 }
 471
 472 int get_neighbours (int line, int col, int reduced_mode) {
 473         /* counts mines surrounding a square
 474            modes: 0=normal; 1=reduced */
 475
 476         int count = 0;
 477
 478         for (int l = MAX(line-1, 0); l <= MIN(line+1, f.h-1); l++) {
 479                 for (int c = MAX(col-1, 0); c <= MIN(col+1, f.w-1); c++) {
 480                         if (!l && !c) continue;
 481
 482                         count += !!f.c[l][c].m;
 483                         count -= reduced_mode * f.c[l][c].f==FLAG;
 484                 }
 485         }
 486         return count;
 487 }
 488
 489 struct minecell** alloc_array (int lines, int cols) {
 490         struct minecell** a = malloc (lines * sizeof(struct minecell*));
 491         if (a == NULL) return NULL;
 492         for (int l = 0; l < lines; l++) {
 493                 a[l] = calloc (cols, sizeof(struct minecell));
 494                 if (a[l] == NULL) goto unalloc;
 495         }
 496
 497         return a;
 498 unalloc:
 499         for (int l = 0; l < lines; l++)
 500                 free (a[l]);
 501         return NULL;
 502 }
 503
 504 void free_field (void) {
 505         if (f.c == NULL) return;
 506         for (int l = 0; l < f.h; l++) {
 507                 free (f.c[l]);
 508         }
 509
 510         free (f.c);
 511         f.c = NULL;
 512 }
 513
 514 int screen2field_l (int l) {
 515         return (l-LINE_OFFSET) - 1;
 516 }
 517 int screen2field_c (int c) {
 518         /* this depends on the cell width and only works when it is 1 or 2. */
 519         return (c-COL_OFFSET+1 - 2*(CW%2))/2 - CW/2;
 520 }
 521 int field2screen_c (int c) {
 522         return (CW*c+COL_OFFSET - (CW%2));
 523 }
 524 int clicked_emoticon (unsigned char* mouse) {
 525         return (mouse[2] == LINE_OFFSET-1 && (
 526                 mouse[1] == f.w+COL_OFFSET ||
 527                 mouse[1] == f.w+COL_OFFSET+1));
 528 }
 529
 530 enum esc_states {
 531         START,
 532         ESC_SENT,
 533         CSI_SENT,
 534         MOUSE_EVENT,
 535 };
 536 int getctrlseq (unsigned char* buf) {
 537         int c;
 538         int state = START;
 539         int offset = 0x20; /* never sends control chars as data */
 540         while ((c = getchar()) != EOF) {
 541                 switch (state) {
 542                 case START:
 543                         switch (c) {
 544                         case '\033': state=ESC_SENT; break;
 545                         default: return c;
 546                         }
 547                         break;
 548                 case ESC_SENT:
 549                         switch (c) {
 550                         case '[': state=CSI_SENT; break;
 551                         default: return CTRSEQ_INVALID;
 552                         }
 553                         break;
 554                 case CSI_SENT:
 555                         switch (c) {
 556                         case 'A': return CTRSEQ_CURSOR_UP;
 557                         case 'B': return CTRSEQ_CURSOR_DOWN;
 558                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 559                         case 'D': return CTRSEQ_CURSOR_LEFT;
 560                         case 'M': state=MOUSE_EVENT; break;
 561                         default: return CTRSEQ_INVALID;
 562                         }
 563                         break;
 564                 case MOUSE_EVENT:
 565                         buf[0] = c - offset;
 566                         buf[1] = getchar() - offset;
 567                         buf[2] = getchar() - offset;
 568                         return CTRSEQ_MOUSE;
 569                 default:
 570                         return CTRSEQ_INVALID;
 571                 }
 572         }
 573         return 2;
 574 }
 575
 576 int getch(unsigned char* buf) {
 577 /* returns a character, EOF, or constant for an escape/control sequence - NOT
 578 compatible with the ncurses implementation of same name */
 579         int action = getctrlseq(buf);
 580         int l, c;
 581         switch (action) {
 582         case CTRSEQ_MOUSE:
 583                 l = screen2field_l (buf[2]);
 584                 c = screen2field_c (buf[1]);
 585
 586                 if (buf[0] > 3) break; /* ignore all but left/middle/right/up */
 587                 int success = wait_mouse_up(l, c);
 588
 589                 /* mouse moved while pressed: */
 590                 if (!success) return CTRSEQ_INVALID;
 591
 592                 switch (buf[0]) {
 593                 case 0: return CTRSEQ_MOUSE_LEFT;
 594                 case 1: return CTRSEQ_MOUSE_MIDDLE;
 595                 case 2: return CTRSEQ_MOUSE_RIGHT;
 596                 }
 597         }
 598
 599         return action;
 600 }
 601
 602 int getch_wrapper (void) {
 603         unsigned char mouse[3];
 604         int c = getch(mouse);
 605
 606         if (c == CTRSEQ_MOUSE_LEFT || c == CTRSEQ_MOUSE_RIGHT) {
 607                 if (clicked_emoticon(mouse))
 608                         return WRAPPER_EMOTICON;
 609
 610                 if (screen2field_c (mouse[1]) < 0
 611                  || screen2field_c (mouse[1]) >= f.w
 612                  || screen2field_l (mouse[2]) < 0
 613                  || screen2field_l (mouse[2]) >= f.h)
 614                         return CTRSEQ_INVALID;
 615
 616                 g.p[0] = screen2field_l (mouse[2]);
 617                 g.p[1] = screen2field_c (mouse[1]);
 618
 619                 return c; /* CTRSEQ_MOUSE_LEFT || CTRSEQ_MOUSE_RIGHT */
 620         }
 621
 622         return c;
 623 }
 624
 625 int parse_fieldspec(char* str) {
 626         /* parses the FIELDSPEC (WxHxM); returns 1 on error */
 627         int n = sscanf (str, "%dx%dx%d", &f.w, &f.h, &f.m);
 628         struct winsize w;
 629         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 630
 631         /* clamp field size to terminal size and mouse maximum: */
 632         if (COL_OFFSET + f.w*CW + COL_OFFSET > w.ws_col)
 633                 f.w = w.ws_col/CW - (COL_OFFSET+COL_OFFSET);
 634         if (LINE_OFFSET + f.h + LINES_AFTER > w.ws_row)
 635                 f.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 636         if (COL_OFFSET + f.w*CW > MOUSE_MAX)
 637                 f.w = MOUSE_MAX/CW - COL_OFFSET;
 638         if (LINE_OFFSET + f.h > MOUSE_MAX)
 639                 f.h = MOUSE_MAX - LINE_OFFSET;
 640
 641         if (n < 2) {
 642                 return 1; /* error */
 643         } else if (n == 2) {
 644                 if (f.w < 30) f.m = f.w*f.h*.15625;
 645                 else f.m = f.w*f.h*.20625;
 646         }
 647
 648         return 0;
 649 }
 650
 651 void timer_setup (int enable) {
 652         static struct itimerval tbuf;
 653         tbuf.it_interval.tv_sec  = 1;
 654         tbuf.it_interval.tv_usec = 0;
 655
 656         if (enable) {
 657                 g.t = time(NULL);
 658                 tbuf.it_value.tv_sec  = 1;
 659                 tbuf.it_value.tv_usec = 0;
 660                 if (setitimer(ITIMER_REAL, &tbuf, NULL) == -1) {
 661                         perror("setitimer");
 662                         exit(1);
 663                 }
 664         } else {
 665                 tbuf.it_value.tv_sec  = 0;
 666                 tbuf.it_value.tv_usec = 0;
 667                 if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 668                         perror("setitimer");
 669                         exit(1);
 670                 }
 671         }
 672
 673 }
 674
 675 void signal_setup (void) {
 676         struct sigaction saction;
 677
 678         saction.sa_handler = signal_handler;
 679         sigemptyset(&saction.sa_mask);
 680         saction.sa_flags   = 0;
 681         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 682                 perror("SIGALRM");
 683                 exit(1);
 684         }
 685
 686         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 687                 perror ("SIGINT");
 688                 exit (1);
 689         }
 690 }
 691
 692 void signal_handler (int signum) {
 693         int dtime;
 694         switch (signum) {
 695         case SIGALRM:
 696                 dtime = difftime (time(NULL), g.t);
 697                 move_ph (1, f.w*CW-(CW%2)-3-(dtime>999));
 698                 printf ("[%03d]", g.t?dtime:0);
 699                 break;
 700         case SIGINT:
 701                 exit(128+SIGINT);
 702         }
 703 }
 704
 705 void screen_setup (int enable) {
 706         if (enable) {
 707                 raw_mode(1);
 708                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 709                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 710                 printf ("\033[?1000h\033[?25l"); /* enable mouse, hide cursor */
 711                 print (op.scheme->init_seq); /* swich charset, if necessary */
 712         } else {
 713                 print (op.scheme->reset_seq); /* reset charset, if necessary */
 714                 printf ("\033[?9l\033[?25h"); /* disable mouse, show cursor */
 715                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 716                 raw_mode(0);
 717         }
 718 }
 719
 720 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 721 void raw_mode(int enable) {
 722         static struct termios saved_term_mode;
 723         struct termios raw_term_mode;
 724
 725         if (enable) {
 726                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 727                 raw_term_mode = saved_term_mode;
 728                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 729                 raw_term_mode.c_cc[VMIN] = 1 ;
 730                 raw_term_mode.c_cc[VTIME] = 0;
 731                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 732         } else {
 733                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 734         }
 735 }