| 1 | /* |
| 2 | * Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved. |
| 3 | * |
| 4 | * Copy permission is hereby granted provided that this notice is |
| 5 | * retained on all partial or complete copies. |
| 6 | * |
| 7 | * For more info on this and all of my stuff, mail edjames@berkeley.edu. |
| 8 | */ |
| 9 | |
| 10 | #ifndef lint |
| 11 | static char sccsid[] = "@(#)input.c 5.2 (Berkeley) %G%"; |
| 12 | #endif not lint |
| 13 | |
| 14 | #include "include.h" |
| 15 | |
| 16 | #define MAXRULES 6 |
| 17 | #define MAXDEPTH 15 |
| 18 | |
| 19 | #define RETTOKEN '\n' |
| 20 | #ifdef SYSV |
| 21 | #define CRTOKEN '\r' |
| 22 | #endif |
| 23 | #define REDRAWTOKEN '\014' /* CTRL(L) */ |
| 24 | #define SHELLTOKEN '!' |
| 25 | #define HELPTOKEN '?' |
| 26 | #define ALPHATOKEN 256 |
| 27 | #define NUMTOKEN 257 |
| 28 | |
| 29 | typedef struct { |
| 30 | int token; |
| 31 | int to_state; |
| 32 | char *str; |
| 33 | char *(*func)(); |
| 34 | } RULE; |
| 35 | |
| 36 | typedef struct { |
| 37 | int num_rules; |
| 38 | RULE *rule; |
| 39 | } STATE; |
| 40 | |
| 41 | typedef struct { |
| 42 | char str[20]; |
| 43 | int state; |
| 44 | int rule; |
| 45 | int ch; |
| 46 | int pos; |
| 47 | } STACK; |
| 48 | |
| 49 | #define T_RULE stack[level].rule |
| 50 | #define T_STATE stack[level].state |
| 51 | #define T_STR stack[level].str |
| 52 | #define T_POS stack[level].pos |
| 53 | #define T_CH stack[level].ch |
| 54 | |
| 55 | #define NUMELS(a) (sizeof (a) / sizeof (*(a))) |
| 56 | |
| 57 | #define NUMSTATES NUMELS(st) |
| 58 | |
| 59 | char *setplane(), *circle(), *left(), *right(), *Left(), *Right(), |
| 60 | *beacon(), *ex_it(), *climb(), *descend(), *setalt(), *setrelalt(), |
| 61 | *benum(), *to_dir(), *rel_dir(), *delayb(), *mark(), *unmark(), |
| 62 | *airport(), *turn(), *ignore(); |
| 63 | |
| 64 | RULE state0[] = { { ALPHATOKEN, 1, "%c:", setplane}, |
| 65 | { RETTOKEN, -1, "", NULL }, |
| 66 | #ifdef SYSV |
| 67 | { CRTOKEN, -1, "", NULL }, |
| 68 | #endif |
| 69 | { HELPTOKEN, 12, " [a-z]<ret>", NULL }}, |
| 70 | state1[] = { { 't', 2, " turn", turn }, |
| 71 | { 'a', 3, " altitude:", NULL }, |
| 72 | { 'c', 4, " circle", circle }, |
| 73 | { 'm', 7, " mark", mark }, |
| 74 | { 'u', 7, " unmark", unmark }, |
| 75 | { 'i', 7, " ignore", ignore }, |
| 76 | { HELPTOKEN, 12, " tacmui", NULL }}, |
| 77 | state2[] = { { 'l', 6, " left", left }, |
| 78 | { 'r', 6, " right", right }, |
| 79 | { 'L', 4, " left 90", Left }, |
| 80 | { 'R', 4, " right 90", Right }, |
| 81 | { 't', 11, " towards", NULL }, |
| 82 | { 'w', 4, " to 0", to_dir }, |
| 83 | { 'e', 4, " to 45", to_dir }, |
| 84 | { 'd', 4, " to 90", to_dir }, |
| 85 | { 'c', 4, " to 135", to_dir }, |
| 86 | { 'x', 4, " to 180", to_dir }, |
| 87 | { 'z', 4, " to 225", to_dir }, |
| 88 | { 'a', 4, " to 270", to_dir }, |
| 89 | { 'q', 4, " to 315", to_dir }, |
| 90 | { HELPTOKEN, 12, " lrLRt<dir>", NULL }}, |
| 91 | state3[] = { { '+', 10, " climb", climb }, |
| 92 | { 'c', 10, " climb", climb }, |
| 93 | { '-', 10, " descend", descend }, |
| 94 | { 'd', 10, " descend", descend }, |
| 95 | { NUMTOKEN, 7, " %c000 feet", setalt }, |
| 96 | { HELPTOKEN, 12, " +-cd[0-9]", NULL }}, |
| 97 | state4[] = { { '@', 9, " at", NULL }, |
| 98 | { 'a', 9, " at", NULL }, |
| 99 | { RETTOKEN, -1, "", NULL }, |
| 100 | #ifdef SYSV |
| 101 | { CRTOKEN, -1, "", NULL }, |
| 102 | #endif |
| 103 | { HELPTOKEN, 12, " @a<ret>", NULL }}, |
| 104 | state5[] = { { NUMTOKEN, 7, "%c", delayb }, |
| 105 | { HELPTOKEN, 12, " [0-9]", NULL }}, |
| 106 | state6[] = { { '@', 9, " at", NULL }, |
| 107 | { 'a', 9, " at", NULL }, |
| 108 | { 'w', 4, " 0", rel_dir }, |
| 109 | { 'e', 4, " 45", rel_dir }, |
| 110 | { 'd', 4, " 90", rel_dir }, |
| 111 | { 'c', 4, " 135", rel_dir }, |
| 112 | { 'x', 4, " 180", rel_dir }, |
| 113 | { 'z', 4, " 225", rel_dir }, |
| 114 | { 'a', 4, " 270", rel_dir }, |
| 115 | { 'q', 4, " 315", rel_dir }, |
| 116 | { RETTOKEN, -1, "", NULL }, |
| 117 | #ifdef SYSV |
| 118 | { CRTOKEN, -1, "", NULL }, |
| 119 | #endif |
| 120 | { HELPTOKEN, 12, " @a<dir><ret>",NULL }}, |
| 121 | state7[] = { { RETTOKEN, -1, "", NULL }, |
| 122 | #ifdef SYSV |
| 123 | { CRTOKEN, -1, "", NULL }, |
| 124 | #endif |
| 125 | { HELPTOKEN, 12, " <ret>", NULL }}, |
| 126 | state8[] = { { NUMTOKEN, 4, "%c", benum }, |
| 127 | { HELPTOKEN, 12, " [0-9]", NULL }}, |
| 128 | state9[] = { { 'b', 5, " beacon #", NULL }, |
| 129 | { '*', 5, " beacon #", NULL }, |
| 130 | { HELPTOKEN, 12, " b*", NULL }}, |
| 131 | state10[] = { { NUMTOKEN, 7, " %c000 ft", setrelalt}, |
| 132 | { HELPTOKEN, 12, " [0-9]", NULL }}, |
| 133 | state11[] = { { 'b', 8, " beacon #", beacon }, |
| 134 | { '*', 8, " beacon #", beacon }, |
| 135 | { 'e', 8, " exit #", ex_it }, |
| 136 | { 'a', 8, " airport #", airport }, |
| 137 | { HELPTOKEN, 12, " b*ea", NULL }}, |
| 138 | state12[] = { { -1, -1, "", NULL }}; |
| 139 | |
| 140 | #define DEF_STATE(s) { NUMELS(s), (s) } |
| 141 | |
| 142 | STATE st[] = { |
| 143 | DEF_STATE(state0), DEF_STATE(state1), DEF_STATE(state2), |
| 144 | DEF_STATE(state3), DEF_STATE(state4), DEF_STATE(state5), |
| 145 | DEF_STATE(state6), DEF_STATE(state7), DEF_STATE(state8), |
| 146 | DEF_STATE(state9), DEF_STATE(state10), DEF_STATE(state11), |
| 147 | DEF_STATE(state12) |
| 148 | }; |
| 149 | |
| 150 | PLANE p; |
| 151 | STACK stack[MAXDEPTH]; |
| 152 | int level; |
| 153 | int tval; |
| 154 | int dest_type, dest_no, dir; |
| 155 | |
| 156 | pop() |
| 157 | { |
| 158 | if (level == 0) |
| 159 | return (-1); |
| 160 | level--; |
| 161 | |
| 162 | ioclrtoeol(T_POS); |
| 163 | |
| 164 | strcpy(T_STR, ""); |
| 165 | T_RULE = -1; |
| 166 | T_CH = -1; |
| 167 | return (0); |
| 168 | } |
| 169 | |
| 170 | rezero() |
| 171 | { |
| 172 | iomove(0); |
| 173 | |
| 174 | level = 0; |
| 175 | T_STATE = 0; |
| 176 | T_RULE = -1; |
| 177 | T_CH = -1; |
| 178 | T_POS = 0; |
| 179 | strcpy(T_STR, ""); |
| 180 | } |
| 181 | |
| 182 | push(ruleno, ch) |
| 183 | { |
| 184 | int newstate, newpos; |
| 185 | |
| 186 | (void)sprintf(T_STR, st[T_STATE].rule[ruleno].str, tval); |
| 187 | T_RULE = ruleno; |
| 188 | T_CH = ch; |
| 189 | newstate = st[T_STATE].rule[ruleno].to_state; |
| 190 | newpos = T_POS + strlen(T_STR); |
| 191 | |
| 192 | ioaddstr(T_POS, T_STR); |
| 193 | |
| 194 | if (level == 0) |
| 195 | ioclrtobot(); |
| 196 | level++; |
| 197 | T_STATE = newstate; |
| 198 | T_POS = newpos; |
| 199 | T_RULE = -1; |
| 200 | strcpy(T_STR, ""); |
| 201 | } |
| 202 | |
| 203 | getcommand() |
| 204 | { |
| 205 | int c, i, done; |
| 206 | char *s, *(*func)(); |
| 207 | PLANE *pp; |
| 208 | |
| 209 | rezero(); |
| 210 | |
| 211 | do { |
| 212 | c = gettoken(); |
| 213 | if (c == tty_new.sg_erase) { |
| 214 | if (pop() < 0) |
| 215 | noise(); |
| 216 | } else if (c == tty_new.sg_kill) { |
| 217 | while (pop() >= 0) |
| 218 | ; |
| 219 | } else { |
| 220 | done = 0; |
| 221 | for (i = 0; i < st[T_STATE].num_rules; i++) { |
| 222 | if (st[T_STATE].rule[i].token == c || |
| 223 | st[T_STATE].rule[i].token == tval) { |
| 224 | push(i, (c >= ALPHATOKEN) ? tval : c); |
| 225 | done = 1; |
| 226 | break; |
| 227 | } |
| 228 | } |
| 229 | if (!done) |
| 230 | noise(); |
| 231 | } |
| 232 | } while (T_STATE != -1); |
| 233 | |
| 234 | if (level == 1) |
| 235 | return (1); /* forced update */ |
| 236 | |
| 237 | dest_type = T_NODEST; |
| 238 | |
| 239 | for (i = 0; i < level; i++) { |
| 240 | func = st[stack[i].state].rule[stack[i].rule].func; |
| 241 | if (func != NULL) |
| 242 | if ((s = (*func)(stack[i].ch)) != NULL) { |
| 243 | ioerror(stack[i].pos, strlen(stack[i].str), s); |
| 244 | return (-1); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | pp = findplane(p.plane_no); |
| 249 | if (pp->new_altitude != p.new_altitude) |
| 250 | pp->new_altitude = p.new_altitude; |
| 251 | else if (pp->status != p.status) |
| 252 | pp->status = p.status; |
| 253 | else { |
| 254 | pp->new_dir = p.new_dir; |
| 255 | pp->delayd = p.delayd; |
| 256 | pp->delayd_no = p.delayd_no; |
| 257 | } |
| 258 | return (0); |
| 259 | } |
| 260 | |
| 261 | noise() |
| 262 | { |
| 263 | putchar('\07'); |
| 264 | fflush(stdout); |
| 265 | } |
| 266 | |
| 267 | gettoken() |
| 268 | { |
| 269 | while ((tval = getAChar()) == REDRAWTOKEN || tval == SHELLTOKEN) |
| 270 | { |
| 271 | if (tval == SHELLTOKEN) |
| 272 | { |
| 273 | #ifdef BSD |
| 274 | struct itimerval itv; |
| 275 | itv.it_value.tv_sec = 0; |
| 276 | itv.it_value.tv_usec = 0; |
| 277 | setitimer(ITIMER_REAL, &itv, NULL); |
| 278 | #endif |
| 279 | #ifdef SYSV |
| 280 | int aval; |
| 281 | aval = alarm(0); |
| 282 | #endif |
| 283 | if (fork() == 0) /* child */ |
| 284 | { |
| 285 | char *shell, *base, *getenv(), *strrchr(); |
| 286 | |
| 287 | setuid(getuid()); /* turn off setuid bit */ |
| 288 | done_screen(); |
| 289 | |
| 290 | /* run user's favorite shell */ |
| 291 | if ((shell = getenv("SHELL")) != NULL) |
| 292 | { |
| 293 | base = strrchr(shell, '/'); |
| 294 | if (base == NULL) |
| 295 | base = shell; |
| 296 | else |
| 297 | base++; |
| 298 | execl(shell, base, 0); |
| 299 | } |
| 300 | else |
| 301 | execl("/bin/sh", "sh", 0); |
| 302 | |
| 303 | exit(0); /* oops */ |
| 304 | } |
| 305 | |
| 306 | wait(0); |
| 307 | #ifdef BSD |
| 308 | ioctl(fileno(stdin), TIOCSETP, &tty_new); |
| 309 | itv.it_value.tv_sec = 0; |
| 310 | itv.it_value.tv_usec = 1; |
| 311 | itv.it_interval.tv_sec = sp->update_secs; |
| 312 | itv.it_interval.tv_usec = 0; |
| 313 | setitimer(ITIMER_REAL, &itv, NULL); |
| 314 | #endif |
| 315 | #ifdef SYSV |
| 316 | ioctl(fileno(stdin), TCSETAW, &tty_new); |
| 317 | alarm(aval); |
| 318 | #endif |
| 319 | } |
| 320 | redraw(); |
| 321 | } |
| 322 | |
| 323 | if (isdigit(tval)) |
| 324 | return (NUMTOKEN); |
| 325 | else if (isalpha(tval)) |
| 326 | return (ALPHATOKEN); |
| 327 | else |
| 328 | return (tval); |
| 329 | } |
| 330 | |
| 331 | char * |
| 332 | setplane(c) |
| 333 | { |
| 334 | PLANE *pp; |
| 335 | |
| 336 | pp = findplane(number(c)); |
| 337 | if (pp == NULL) |
| 338 | return ("Unknown Plane"); |
| 339 | bcopy(pp, &p, sizeof (p)); |
| 340 | p.delayd = 0; |
| 341 | return (NULL); |
| 342 | } |
| 343 | |
| 344 | char * |
| 345 | turn(c) |
| 346 | { |
| 347 | if (p.altitude == 0) |
| 348 | return ("Planes at airports may not change direction"); |
| 349 | return (NULL); |
| 350 | } |
| 351 | |
| 352 | char * |
| 353 | circle(c) |
| 354 | { |
| 355 | if (p.altitude == 0) |
| 356 | return ("Planes cannot circle on the ground"); |
| 357 | p.new_dir = MAXDIR; |
| 358 | return (NULL); |
| 359 | } |
| 360 | |
| 361 | char * |
| 362 | left(c) |
| 363 | { |
| 364 | dir = D_LEFT; |
| 365 | p.new_dir = p.dir - 1; |
| 366 | if (p.new_dir < 0) |
| 367 | p.new_dir += MAXDIR; |
| 368 | return (NULL); |
| 369 | } |
| 370 | |
| 371 | char * |
| 372 | right(c) |
| 373 | { |
| 374 | dir = D_RIGHT; |
| 375 | p.new_dir = p.dir + 1; |
| 376 | if (p.new_dir > MAXDIR) |
| 377 | p.new_dir -= MAXDIR; |
| 378 | return (NULL); |
| 379 | } |
| 380 | |
| 381 | char * |
| 382 | Left(c) |
| 383 | { |
| 384 | p.new_dir = p.dir - 2; |
| 385 | if (p.new_dir < 0) |
| 386 | p.new_dir += MAXDIR; |
| 387 | return (NULL); |
| 388 | } |
| 389 | |
| 390 | char * |
| 391 | Right(c) |
| 392 | { |
| 393 | p.new_dir = p.dir + 2; |
| 394 | if (p.new_dir > MAXDIR) |
| 395 | p.new_dir -= MAXDIR; |
| 396 | return (NULL); |
| 397 | } |
| 398 | |
| 399 | char * |
| 400 | delayb(c) |
| 401 | { |
| 402 | int xdiff, ydiff; |
| 403 | |
| 404 | c -= '0'; |
| 405 | |
| 406 | if (c >= sp->num_beacons) |
| 407 | return ("Unknown beacon"); |
| 408 | xdiff = sp->beacon[c].x - p.xpos; |
| 409 | xdiff = SGN(xdiff); |
| 410 | ydiff = sp->beacon[c].y - p.ypos; |
| 411 | ydiff = SGN(ydiff); |
| 412 | if (xdiff != displacement[p.dir].dx || ydiff != displacement[p.dir].dy) |
| 413 | return ("Beacon is not in flight path"); |
| 414 | p.delayd = 1; |
| 415 | p.delayd_no = c; |
| 416 | |
| 417 | if (dest_type != T_NODEST) { |
| 418 | switch (dest_type) { |
| 419 | case T_BEACON: |
| 420 | xdiff = sp->beacon[dest_no].x - sp->beacon[c].x; |
| 421 | ydiff = sp->beacon[dest_no].y - sp->beacon[c].y; |
| 422 | break; |
| 423 | case T_EXIT: |
| 424 | xdiff = sp->exit[dest_no].x - sp->beacon[c].x; |
| 425 | ydiff = sp->exit[dest_no].y - sp->beacon[c].y; |
| 426 | break; |
| 427 | case T_AIRPORT: |
| 428 | xdiff = sp->airport[dest_no].x - sp->beacon[c].x; |
| 429 | ydiff = sp->airport[dest_no].y - sp->beacon[c].y; |
| 430 | break; |
| 431 | default: |
| 432 | return ("Bad case in delayb! Get help!"); |
| 433 | break; |
| 434 | } |
| 435 | if (xdiff == 0 && ydiff == 0) |
| 436 | return ("Would already be there"); |
| 437 | p.new_dir = DIR_FROM_DXDY(xdiff, ydiff); |
| 438 | if (p.new_dir == p.dir) |
| 439 | return ("Already going in that direction"); |
| 440 | } |
| 441 | return (NULL); |
| 442 | } |
| 443 | |
| 444 | char * |
| 445 | beacon(c) |
| 446 | { |
| 447 | dest_type = T_BEACON; |
| 448 | return (NULL); |
| 449 | } |
| 450 | |
| 451 | char * |
| 452 | ex_it(c) |
| 453 | { |
| 454 | dest_type = T_EXIT; |
| 455 | return (NULL); |
| 456 | } |
| 457 | |
| 458 | char * |
| 459 | airport(c) |
| 460 | { |
| 461 | dest_type = T_AIRPORT; |
| 462 | return (NULL); |
| 463 | } |
| 464 | |
| 465 | char * |
| 466 | climb(c) |
| 467 | { |
| 468 | dir = D_UP; |
| 469 | return (NULL); |
| 470 | } |
| 471 | |
| 472 | char * |
| 473 | descend(c) |
| 474 | { |
| 475 | dir = D_DOWN; |
| 476 | return (NULL); |
| 477 | } |
| 478 | |
| 479 | char * |
| 480 | setalt(c) |
| 481 | { |
| 482 | if ((p.altitude == c - '0') && (p.new_altitude == p.altitude)) |
| 483 | return ("Already at that altitude"); |
| 484 | p.new_altitude = c - '0'; |
| 485 | return (NULL); |
| 486 | } |
| 487 | |
| 488 | char * |
| 489 | setrelalt(c) |
| 490 | { |
| 491 | if (c == 0) |
| 492 | return ("altitude not changed"); |
| 493 | |
| 494 | switch (dir) { |
| 495 | case D_UP: |
| 496 | p.new_altitude = p.altitude + c - '0'; |
| 497 | break; |
| 498 | case D_DOWN: |
| 499 | p.new_altitude = p.altitude - (c - '0'); |
| 500 | break; |
| 501 | default: |
| 502 | return ("Unknown case in setrelalt! Get help!"); |
| 503 | break; |
| 504 | } |
| 505 | if (p.new_altitude < 0) |
| 506 | return ("Altitude would be too low"); |
| 507 | else if (p.new_altitude > 9) |
| 508 | return ("Altitude would be too high"); |
| 509 | return (NULL); |
| 510 | } |
| 511 | |
| 512 | char * |
| 513 | benum(c) |
| 514 | { |
| 515 | dest_no = c -= '0'; |
| 516 | |
| 517 | switch (dest_type) { |
| 518 | case T_BEACON: |
| 519 | if (c >= sp->num_beacons) |
| 520 | return ("Unknown beacon"); |
| 521 | p.new_dir = DIR_FROM_DXDY(sp->beacon[c].x - p.xpos, |
| 522 | sp->beacon[c].y - p.ypos); |
| 523 | break; |
| 524 | case T_EXIT: |
| 525 | if (c >= sp->num_exits) |
| 526 | return ("Unknown exit"); |
| 527 | p.new_dir = DIR_FROM_DXDY(sp->exit[c].x - p.xpos, |
| 528 | sp->exit[c].y - p.ypos); |
| 529 | break; |
| 530 | case T_AIRPORT: |
| 531 | if (c >= sp->num_airports) |
| 532 | return ("Unknown airport"); |
| 533 | p.new_dir = DIR_FROM_DXDY(sp->airport[c].x - p.xpos, |
| 534 | sp->airport[c].y - p.ypos); |
| 535 | break; |
| 536 | default: |
| 537 | return ("Unknown case in benum! Get help!"); |
| 538 | break; |
| 539 | } |
| 540 | return (NULL); |
| 541 | } |
| 542 | |
| 543 | char * |
| 544 | to_dir(c) |
| 545 | { |
| 546 | p.new_dir = dir_no(c); |
| 547 | return (NULL); |
| 548 | } |
| 549 | |
| 550 | char * |
| 551 | rel_dir(c) |
| 552 | { |
| 553 | int angle; |
| 554 | |
| 555 | angle = dir_no(c); |
| 556 | switch (dir) { |
| 557 | case D_LEFT: |
| 558 | p.new_dir = p.dir - angle; |
| 559 | if (p.new_dir < 0) |
| 560 | p.new_dir += MAXDIR; |
| 561 | break; |
| 562 | case D_RIGHT: |
| 563 | p.new_dir = p.dir + angle; |
| 564 | if (p.new_dir >= MAXDIR) |
| 565 | p.new_dir -= MAXDIR; |
| 566 | break; |
| 567 | default: |
| 568 | return ("Bizarre direction in rel_dir! Get help!"); |
| 569 | break; |
| 570 | } |
| 571 | return (NULL); |
| 572 | } |
| 573 | |
| 574 | char * |
| 575 | mark(c) |
| 576 | { |
| 577 | if (p.altitude == 0) |
| 578 | return ("Cannot mark planes on the ground"); |
| 579 | if (p.status == S_MARKED) |
| 580 | return ("Already marked"); |
| 581 | p.status = S_MARKED; |
| 582 | return (NULL); |
| 583 | } |
| 584 | |
| 585 | char * |
| 586 | unmark(c) |
| 587 | { |
| 588 | if (p.altitude == 0) |
| 589 | return ("Cannot unmark planes on the ground"); |
| 590 | if (p.status == S_UNMARKED) |
| 591 | return ("Already unmarked"); |
| 592 | p.status = S_UNMARKED; |
| 593 | return (NULL); |
| 594 | } |
| 595 | |
| 596 | char * |
| 597 | ignore(c) |
| 598 | { |
| 599 | if (p.altitude == 0) |
| 600 | return ("Cannot ignore planes on the ground"); |
| 601 | if (p.status == S_IGNORED) |
| 602 | return ("Already ignored"); |
| 603 | p.status = S_IGNORED; |
| 604 | return (NULL); |
| 605 | } |
| 606 | |
| 607 | dir_no(ch) |
| 608 | char ch; |
| 609 | { |
| 610 | int dir; |
| 611 | |
| 612 | switch (ch) { |
| 613 | case 'w': dir = 0; break; |
| 614 | case 'e': dir = 1; break; |
| 615 | case 'd': dir = 2; break; |
| 616 | case 'c': dir = 3; break; |
| 617 | case 'x': dir = 4; break; |
| 618 | case 'z': dir = 5; break; |
| 619 | case 'a': dir = 6; break; |
| 620 | case 'q': dir = 7; break; |
| 621 | default: |
| 622 | fprintf(stderr, "bad character in dir_no\n"); |
| 623 | break; |
| 624 | } |
| 625 | return (dir); |
| 626 | } |