viiper.c

   1 /*******************************************************************************
   2  viiper 0.1
   3  By Tobias Girstmair, 2018
   4
   5  ./viiper 40x25
   6  (see ./viiper -h for full list of options)
   7
   8  KEYBINDINGS:  - hjkl to move
   9                - p to pause and resume
  10                - r to restart
  11                - q to quit
  12                - (see `./minesviiper -h' for all keybindings)
  13
  14  GNU GPL v3, see LICENSE or https://www.gnu.org/licenses/gpl-3.0.txt
  15 *******************************************************************************/
  16
  17
  18 #define _POSIX_C_SOURCE 2 /*for getopt and sigaction in c99, sigsetjmp*/
  19 #include <setjmp.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.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 "viiper.h"
  31 #include "schemes.h"
  32
  33 #define MIN(a,b) (a>b?b:a)
  34 #define MAX(a,b) (a>b?a:b)
  35 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
  36 #define printm(n, s) for (int _loop = 0; _loop < n; _loop++) fputs (s, stdout)
  37 #define print(str) fputs (str?str:"", stdout)
  38 #define CTRL_ 0x1F &
  39
  40 #define OPPOSITE(dir) ( \
  41         dir == EAST  ? WEST  :   \
  42         dir == WEST  ? EAST  :   \
  43         dir == NORTH ? SOUTH :   \
  44         dir == SOUTH ? NORTH : -1)
  45
  46 #define COL_OFFSET 1
  47 #define LINE_OFFSET 1
  48 #define LINES_AFTER 1
  49 #define CW op.sch->cell_width
  50
  51 #define SPEEDUP_AFTER 100 /* increment speed every n points */
  52 #define BONUS_INTERVAL 90 /* how often a bonus item is spawned */
  53 #define BONUS_DURATION 15 /* how long one can catch the bonus */
  54 #define BONUS_WARN      5 /* how long before the removal to warn */
  55
  56 struct game {
  57         int w; /* field width */
  58         int h; /* field height */
  59         int d; /* direction the snake is looking */
  60         int t; /* time of game start */
  61         int p; /* score */
  62         int b; /* time of next bonus item spawn */
  63         float v; /* velocity in moves per second */
  64         struct snake* s; /* snek */
  65         struct item* i; /* items (food, boni) */
  66         struct directions {
  67                 int h; /* write head */
  68                 int n; /* number of elements */
  69                 int c[16];
  70         } k; /* ring buffer for direction events */
  71 } g;
  72
  73 struct opt {
  74         int l; /* initial snake length */
  75         int s; /* initial snake speed */
  76         struct scheme* sch;
  77 } op;
  78
  79 jmp_buf game_over;
  80
  81 int main (int argc, char** argv) {
  82         /* defaults: */
  83         g.w = 30;
  84         g.h = 20;
  85         op.l = 10;
  86         op.s = 8;
  87         op.sch = &unic0de;
  88
  89         int optget;
  90         opterr = 0; /* don't print message on unrecognized option */
  91         while ((optget = getopt (argc, argv, "+s:l:dh")) != -1) {
  92                 switch (optget) {
  93                 case 's':
  94                         op.s = atof(optarg);
  95                         if (op.s < 1) {
  96                                 fprintf (stderr, "speed must be >= 1\n");
  97                                 return 1;
  98                         }
  99                         break;
 100                 case 'l':
 101                         op.l = atoi(optarg);
 102                         if (op.s < 2 || op.s > g.w*g.h-1) {
 103                                 fprintf (stderr, "length must be >= 2 and < W*H\n");
 104                                 return 1;
 105                         }
 106                         break;
 107                 case 'd': op.sch = &vt220_charset; break;
 108                 case 'h':
 109                 default:
 110                         fprintf (stderr, SHORTHELP LONGHELP, argv[0]);
 111                         return !(optget=='h');
 112                 }
 113         } if (optind < argc) { /* parse Fieldspec */
 114                 int n = sscanf (argv[optind], "%dx%d", &g.w, &g.h);
 115
 116                 if (n < 2) {
 117                         fprintf(stderr,"FIELDSIZE is WxH (width 'x' height)\n");
 118                         return 1;
 119                 }
 120         }
 121
 122         clamp_fieldsize();
 123
 124         srand(time(0));
 125         signal_setup();
 126         screen_setup(1);
 127         atexit (*quit);
 128
 129         char* end_screen_msg = "";
 130 restart:
 131         switch (sigsetjmp(game_over, 1)) {
 132         case GAME_INIT:
 133         case GAME_START:
 134                 viiper();
 135                 break; /* function doesn't return, but `-Wextra' complains */
 136         case GAME_OVER:
 137                 end_screen_msg = " GAME  OVER ";
 138                 goto end_screen;
 139         case GAME_WON:
 140                 end_screen_msg = "CONGRATULATIONS!";
 141                 goto end_screen;
 142 end_screen:
 143                 timer_setup(0);
 144                 show_playfield();
 145                 for (;;) switch (end_screen(end_screen_msg)) {
 146                 case 'r': goto restart;
 147                 case 'q': goto quit;
 148                 case CTRL_'L':
 149                         screen_setup(1);
 150                         show_playfield();
 151                         break;
 152                 default: continue;
 153                 }
 154         case GAME_EXIT:
 155                 goto quit;
 156         }
 157
 158 quit:
 159         return 0;
 160 }
 161
 162 int viiper(void) {
 163         init_snake();
 164         show_playfield ();
 165         g.d = EAST;
 166         g.v = op.s;
 167
 168         timer_setup(1);
 169         g.t = time(NULL);
 170         g.p = 0;
 171         g.k.n = 0;
 172         g.b = time(NULL) + BONUS_INTERVAL;
 173
 174         spawn_item(FOOD, rand() % NUM_FOODS, NULL); //TODO: shape distribution, so bigger values get selected less
 175
 176         for(;;) {
 177                 switch (getctrlseq()) {
 178                 case CTRSEQ_CURSOR_LEFT: case 'h':append_movement(WEST);  break;
 179                 case CTRSEQ_CURSOR_DOWN: case 'j':append_movement(SOUTH); break;
 180                 case CTRSEQ_CURSOR_UP:   case 'k':append_movement(NORTH); break;
 181                 case CTRSEQ_CURSOR_RIGHT:case 'l':append_movement(EAST);  break;
 182                 case 'p': //TODO: causes bonus items to be spawned too early; have to increase all timers
 183                         timer_setup(0);
 184                         move_ph (g.h/2+LINE_OFFSET, g.w*CW/2);
 185                         printf ("\033[5mPAUSE\033[0m"); /* blinking text */
 186                         if (getchar() == 'q') exit(0);
 187                         show_playfield();
 188                         timer_setup(1);
 189                         break;
 190                 case 'r': siglongjmp(game_over, GAME_START);
 191                 case 'q': siglongjmp(game_over, GAME_EXIT);
 192                 case CTRL_'L':
 193                         screen_setup(1);
 194                         show_playfield();
 195                         break;
 196                 case 0x02: /* STX; gets sent when returning from SIGALRM */
 197                         continue;
 198                 }
 199         }
 200
 201 }
 202
 203 #define pop_dir() (g.k.n? g.k.c[(16+g.k.h-g.k.n--)%16] : NONE)
 204 void snake_advance (void) {
 205         int respawn = 0;
 206         struct item* i; /*temporary item (defined here to respawn at the end) */
 207         int new_dir = pop_dir();
 208         /* switch direction if new one is in the buffer and it won't kill us: */
 209         if (new_dir && g.d != OPPOSITE(new_dir)) g.d = new_dir;
 210
 211         int new_row = g.s->r +(g.d==SOUTH) -(g.d==NORTH);
 212         int new_col = g.s->c +(g.d==EAST)  -(g.d==WEST);
 213
 214         /* detect food hit and spawn a new food */
 215         for (i = g.i; i; i = i->next) {
 216                 if (i->r == new_row && i->c == new_col) {
 217                         consume_item (i);
 218
 219                         switch (i->t) {
 220                         case FOOD: respawn = 1; break;
 221                         case BONUS: remove_bonus(i); break;
 222                         }
 223                         break;
 224                 }
 225         }
 226
 227         if (new_row >= g.h || new_col >= g.w || new_row < 0 || new_col < 0)
 228                 siglongjmp(game_over, GAME_OVER);
 229
 230         struct snake* new_head;
 231         struct snake* new_tail; /* former second-to-last element */
 232         for (new_tail = g.s; new_tail->next->next; new_tail = new_tail->next)
 233                 /*use the opportunity of looping to check if we eat ourselves:*/
 234                 if(new_tail->next->r == new_row && new_tail->next->c == new_col)
 235                         siglongjmp(game_over, GAME_OVER);
 236         int old_tail[2] = {new_tail->next->r, new_tail->next->c};/*gets erased*/
 237         new_head = new_tail->next; /* reuse element instead of malloc() */
 238         new_tail->next = NULL;
 239
 240         new_head->r = new_row;
 241         new_head->c = new_col;
 242         new_head->next = g.s;
 243
 244         g.s = new_head;
 245
 246         if (respawn) spawn_item(FOOD, rand() % NUM_FOODS, i);
 247         draw_sprites (old_tail[0], old_tail[1]);
 248 }
 249
 250 void spawn_item (int type, int value, struct item* p_item) {
 251         int row, col;
 252         char occupied[g.w][g.h]; int snake_len = 0;
 253         memset(*occupied, 0, g.w*g.h);
 254 try_again:
 255         row = rand() % g.h;
 256         col = rand() % g.w;
 257         if (snake_len >= g.w*g.h-1) siglongjmp(game_over, GAME_WON);
 258         /* loop through snake to check if we aren't on it */
 259         if (occupied[row][col]) goto try_again; /* shortcut */
 260         for (struct snake* s = g.s; s; s = s->next)
 261                 if (s->r == row && s->c == col) {
 262                         occupied[s->r][s->c] = 1; snake_len++;
 263                         goto try_again;
 264                 }
 265
 266         /* if we got a item buffer reuse it, otherwise create a new one: */
 267         struct item* new_item;
 268         if (p_item) new_item = p_item;
 269         else new_item = malloc (sizeof(struct item));
 270
 271         new_item->r = row;
 272         new_item->c = col;
 273         new_item->t = type;
 274         new_item->v = value;
 275         new_item->s = time(0);
 276         if (g.i) g.i->prev = new_item;
 277         new_item->next = g.i;
 278         new_item->prev = NULL;
 279
 280         g.i = new_item;
 281 }
 282
 283 void consume_item (struct item* i) {
 284         int old_score = g.p;
 285
 286         switch (i->t) {
 287         case FOOD:
 288                 switch (i->v) {
 289                 case FOOD_5:  g.p +=  5; break;
 290                 case FOOD_10: g.p += 10; break;
 291                 case FOOD_20: g.p += 20; break;
 292                 }
 293                 snake_append(&g.s, -1, -1);
 294                 break;       /* will be reused as the head before it is drawn */
 295         case BONUS:
 296                 switch (i->v) {
 297                 case BONUS_SNIP:
 298                         for (int i = 5; i && g.s->next->next; i--) {
 299                                 struct snake* p = g.s;
 300                                 while (p->next->next) p = p->next;
 301                                 free (p->next);
 302                                 p->next = NULL;
 303                         }
 304                         show_playfield();
 305                         break;
 306                 case BONUS_GROW:
 307                         for (int i = 5; i; i--) snake_append(&g.s, -1, -1);
 308                         break;
 309                 case BONUS_SLOW: //TODO: this sometimes speeds the snake up?!
 310                         if (g.v > 1) g.v--;
 311                         timer_setup(1);
 312                         break;
 313                 case BONUS_FAST:
 314                         g.v++;
 315                         timer_setup(1);
 316                         break;
 317                 }
 318                 break;
 319         }
 320
 321         if (i->next) i->next->prev = i->prev;
 322         if (i->prev) i->prev->next = i->next;
 323         else g.i = i->next;
 324
 325         /* snake speedup every 100 points: */
 326         if (g.p/SPEEDUP_AFTER - old_score/SPEEDUP_AFTER) g.v++;
 327 }
 328
 329 void spawn_bonus(void) {
 330         for (struct item* i = g.i; i; i = i->next)
 331                 if (i->t == BONUS) { /* bonus already there */
 332                         if (((i->s+BONUS_DURATION)-time(NULL)) < 0) {
 333                                 remove_bonus(i); /* remove if over lifetime */
 334                         }
 335                         return;
 336                 }
 337         if (g.b < time(NULL)) { /* time to spawn item: */
 338                 spawn_item(BONUS, rand() % NUM_BONI, NULL);
 339                 g.b = time(NULL) + BONUS_INTERVAL;
 340         }
 341 }
 342
 343 void show_playfield (void) {
 344         move_ph (0,0);
 345
 346         /* top border */
 347         print(BORDER(T,L));
 348         printm (g.w, BORDER(T,C));
 349         printf ("%s\n", BORDER(T,R));
 350
 351         /* main area */
 352         for (int row = 0; row < g.h; row++)
 353                 printf ("%s%*s%s\n", BORDER(C,L), CW*g.w, "", BORDER(C,R));
 354
 355         /* bottom border */
 356         print(BORDER(B,L));
 357         printm (g.w, BORDER(B,C));
 358         print (BORDER(B,R));
 359
 360         draw_sprites (-1,-1);
 361 }
 362
 363 void draw_sprites (int erase_r, int erase_c) {
 364         /* erase old tail, if any */
 365         if (erase_r >= 0 && erase_c >= 0) {
 366                 move_ph (erase_r+LINE_OFFSET, erase_c*CW+COL_OFFSET);
 367                 printm (CW, " ");
 368         }
 369
 370         /* print snake */
 371         struct snake* last = NULL;
 372         int color = 2;
 373         for (struct snake* s = g.s; s; s = s->next) {
 374                 if (s->r < 0 || s->c < 0) continue; /*can't draw outside term.*/
 375                 move_ph (s->r+LINE_OFFSET, s->c*CW+COL_OFFSET);
 376
 377                 int predecessor = (last==NULL)?NONE:
 378                         (last->r < s->r) ? NORTH:
 379                         (last->r > s->r) ? SOUTH:
 380                         (last->c > s->c) ? EAST:
 381                         (last->c < s->c) ? WEST:NONE;
 382                 int successor = (s->next == NULL)?NONE:
 383                         (s->next->r < s->r) ? NORTH:
 384                         (s->next->r > s->r) ? SOUTH:
 385                         (s->next->c > s->c) ? EAST:
 386                         (s->next->c < s->c) ? WEST:NONE;
 387
 388                 printf ("\033[%sm", op.sch->color[color]);
 389                 print (op.sch->snake[predecessor][successor]);
 390                 printf ("\033[0m");
 391                 last = s;
 392                 color = !color;
 393         }
 394
 395         /* print item queue */
 396         for (struct item* i = g.i; i; i = i->next) {
 397                 move_ph (i->r+LINE_OFFSET, i->c*CW+COL_OFFSET);
 398                 if      (i->t == FOOD)  print(op.sch->food[i->v]);
 399                 else if (i->t == BONUS) {
 400                         if (i->s + BONUS_DURATION-BONUS_WARN < time(NULL))
 401                                 printf("\033[5m%s\033[25m", op.sch->boni[i->v]);
 402                         else print(op.sch->boni[i->v]);
 403                 }
 404         }
 405
 406         /* print score */
 407         int score_width = g.p > 9999?6:4;
 408         move_ph (0, (g.w*CW-score_width)/2-COL_OFFSET);
 409         printf ("%s %0*d %s", BORDER(S,L), score_width, g.p, BORDER(S,R));
 410 printf ("->%f<-", g.v); //TODO: debug only! (BONUS_SLOW)
 411 }
 412
 413 #define MOVE_POPUP(WIDTH, LINE) \
 414         move_ph(g.h/2+LINE_OFFSET-1+LINE,(g.w*op.sch->display_width-WIDTH)/2)
 415 int end_screen(char* message) {
 416         int msg_w = strlen(message);
 417         MOVE_POPUP(msg_w, -1);
 418         print(BORDER(T,L));
 419         printm ((msg_w+2)/op.sch->display_width, BORDER(T,C));
 420         print (BORDER(T,R));
 421
 422         MOVE_POPUP(msg_w, 0);
 423         printf("%s %s %s", BORDER(C,L), message, BORDER(C,R));
 424         MOVE_POPUP(msg_w, 1);
 425         printf("%s `r' restart%*s%s", BORDER(C,L), msg_w-10, "", BORDER(C,R));
 426         MOVE_POPUP(msg_w, 2);
 427         printf("%s `q' quit%*s%s", BORDER(C,L), msg_w-7, "", BORDER(C,R));
 428
 429         MOVE_POPUP(msg_w, 3);
 430         print(BORDER(B,L));
 431         printm ((msg_w+2)/op.sch->display_width, BORDER(B,C));
 432         print (BORDER(B,R));
 433         fflush(stdout);
 434
 435         return getctrlseq();
 436 }
 437
 438 void snake_append (struct snake** s, int row, int col) {
 439         struct snake* new = malloc (sizeof(struct snake));
 440         new->r = row;
 441         new->c = col;
 442         new->next = NULL;
 443
 444         if (*s) {
 445                 struct snake* p = *s;
 446                 while (p->next) p = p->next;
 447                 p->next = new;
 448         } else {
 449                 *s = new;
 450         }
 451 }
 452
 453 void remove_bonus (struct item*  i) {
 454         if (i->next) i->next->prev = i->prev;
 455         if (i->prev) i->prev->next = i->next;
 456         else g.i = i->next;
 457
 458         draw_sprites (i->r, i->c); /* overwrite sprite */
 459
 460         free(i);
 461 }
 462
 463 #define free_ll(head) do{ \
 464         while (head) { \
 465                 void* tmp = head; \
 466                 head = head->next; \
 467                 free(tmp); \
 468         } \
 469         head = NULL; \
 470 }while(0)
 471
 472 void init_snake() {
 473         free_ll(g.s);
 474         free_ll(g.i);
 475
 476         int direction = WEST;
 477         int r = g.h/2;
 478         int c = g.w/2;
 479         int min_r = 0;
 480         int max_r = g.h-1;
 481         int min_c = 0;
 482         int max_c = g.w-1;
 483         for (int i = 0; i < op.l; i++) {
 484                 switch (direction) {
 485                 case NORTH: r--; if(r <= min_r){direction=EAST; min_r++;}break;
 486                 case EAST:  c++; if(c >= max_c){direction=SOUTH;max_c--;}break;
 487                 case SOUTH: r++; if(r >= max_r){direction=WEST; max_r--;}break;
 488                 case WEST:  c--; if(c <= min_c){direction=NORTH;min_c++;}break;
 489                 }
 490
 491                 snake_append(&g.s, r, c);
 492         }
 493 }
 494
 495 void quit (void) {
 496         screen_setup(0);
 497         free_ll(g.s);
 498         free_ll(g.i);
 499 }
 500
 501 enum esc_states {
 502         START,
 503         ESC_SENT,
 504         CSI_SENT,
 505         MOUSE_EVENT,
 506 };
 507 int getctrlseq (void) {
 508         int c;
 509         int state = START;
 510         while ((c = getchar()) != EOF) {
 511                 switch (state) {
 512                 case START:
 513                         switch (c) {
 514                         case '\033': state=ESC_SENT; break;
 515                         default: return c;
 516                         }
 517                         break;
 518                 case ESC_SENT:
 519                         switch (c) {
 520                         case '[': state=CSI_SENT; break;
 521                         default: return CTRSEQ_INVALID;
 522                         }
 523                         break;
 524                 case CSI_SENT:
 525                         switch (c) {
 526                         case 'A': return CTRSEQ_CURSOR_UP;
 527                         case 'B': return CTRSEQ_CURSOR_DOWN;
 528                         case 'C': return CTRSEQ_CURSOR_RIGHT;
 529                         case 'D': return CTRSEQ_CURSOR_LEFT;
 530                         default: return CTRSEQ_INVALID;
 531                         }
 532                         break;
 533                 default:
 534                         return CTRSEQ_INVALID;
 535                 }
 536         }
 537         return 2;
 538 }
 539
 540 void append_movement (int dir) {
 541         if (g.k.n > 15) return; /* no space in buffer */
 542         if (g.k.n && g.k.c[(16+g.k.h-1)%16] == dir)
 543                 return; /* don't add the same direction twice */
 544
 545         g.k.c[g.k.h] = dir;
 546         g.k.n++;
 547         g.k.h = (g.k.h+1) % 16;
 548 }
 549
 550 void move_ph (int line, int col) {
 551         /* move printhead to zero-indexed position */
 552         printf ("\033[%d;%dH", line+1, col+1);
 553 }
 554
 555 void clamp_fieldsize (void) {
 556         /* clamp field size to terminal size and mouse maximum: */
 557         struct winsize w;
 558         ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
 559
 560         if (g.w < 10) g.w = 10;
 561         if (g.h < 10) g.h = 10;
 562
 563         if (COL_OFFSET + g.w*CW + COL_OFFSET > w.ws_col)
 564                 g.w = (w.ws_col - 2*COL_OFFSET) / op.sch->display_width;
 565         if (LINE_OFFSET + g.h + LINES_AFTER > w.ws_row)
 566                 g.h = w.ws_row - (LINE_OFFSET+LINES_AFTER);
 567 }
 568
 569 void timer_setup (int enable) {
 570         static struct itimerval tbuf;
 571         tbuf.it_interval.tv_sec  = 0;
 572         tbuf.it_interval.tv_usec = (1000000/g.v)-1; /*WARN: 1 <= g.v <= 999999*/
 573
 574         if (enable) {
 575                 tbuf.it_value.tv_sec  = tbuf.it_interval.tv_sec;
 576                 tbuf.it_value.tv_usec = tbuf.it_interval.tv_usec;
 577         } else {
 578                 tbuf.it_value.tv_sec  = 0;
 579                 tbuf.it_value.tv_usec = 0;
 580         }
 581
 582         if ( setitimer(ITIMER_REAL, &tbuf, NULL) == -1 ) {
 583                 perror("setitimer");
 584                 exit(1);
 585         }
 586
 587 }
 588
 589 void signal_setup (void) {
 590         struct sigaction saction;
 591
 592         saction.sa_handler = signal_handler;
 593         sigemptyset(&saction.sa_mask);
 594         saction.sa_flags = 0;
 595         if (sigaction(SIGALRM, &saction, NULL) < 0 ) {
 596                 perror("SIGALRM");
 597                 exit(1);
 598         }
 599
 600         if (sigaction(SIGINT, &saction, NULL) < 0 ) {
 601                 perror ("SIGINT");
 602                 exit (1);
 603         }
 604
 605         if (sigaction(SIGCONT, &saction, NULL) < 0 ) {
 606                 perror ("SIGCONT");
 607                 exit (1);
 608         }
 609 }
 610
 611 void signal_handler (int signum) {
 612         switch (signum) {
 613         case SIGALRM:
 614                 snake_advance();
 615                 spawn_bonus();
 616                 break;
 617         case SIGINT:
 618                 exit(128+SIGINT);
 619         case SIGCONT:
 620                 screen_setup(1);
 621                 show_playfield();
 622         }
 623 }
 624
 625 void screen_setup (int enable) {
 626         if (enable) {
 627                 raw_mode(1);
 628                 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
 629                 printf ("\033[H\033[J"); /* reset cursor, clear screen */
 630                 printf ("\033[?25l"); /* hide cursor */
 631                 print (op.sch->init_seq); /* swich charset, if necessary */
 632         } else {
 633                 print (op.sch->reset_seq); /* reset charset, if necessary */
 634                 printf ("\033[?25h"); /* show cursor */
 635                 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
 636                 raw_mode(0);
 637         }
 638 }
 639
 640 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
 641 void raw_mode(int enable) {
 642         static struct termios saved_term_mode;
 643         struct termios raw_term_mode;
 644
 645         if (enable) {
 646                 tcgetattr(STDIN_FILENO, &saved_term_mode);
 647                 raw_term_mode = saved_term_mode;
 648                 raw_term_mode.c_lflag &= ~(ICANON | ECHO);
 649                 raw_term_mode.c_cc[VMIN] = 1 ;
 650                 raw_term_mode.c_cc[VTIME] = 0;
 651                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_term_mode);
 652         } else {
 653                 tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_term_mode);
 654         }
 655 }