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