Source:NetHack 3.2.0/mail.c
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Below is the full text to mail.c from the source code of NetHack 3.2.0.
Warning! This is the source code from an old release. For newer releases, see Source code
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This content was modified from the original NetHack source code distribution (by splitting up NetHack content between wiki pages, and possibly further editing). See the page history for a list of who changed it, and on what dates.
1. /* SCCS Id: @(#)mail.c 3.2 95/07/19 */ 2. /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */ 3. /* NetHack may be freely redistributed. See license for details. */ 4. 5. #include "hack.h" 6. 7. #ifdef MAIL 8. #include "mail.h" 9. /* 10. * Notify user when new mail has arrived. Idea by Merlyn Leroy. 11. * 12. * The mail daemon can move with less than usual restraint. It can: 13. * - move diagonally from a door 14. * - use secret and closed doors 15. * - run through a monster ("Gangway!", etc.) 16. * - run over pools & traps 17. * 18. * Possible extensions: 19. * - Open the file MAIL and do fstat instead of stat for efficiency. 20. * (But sh uses stat, so this cannot be too bad.) 21. * - Examine the mail and produce a scroll of mail named "From somebody". 22. * - Invoke MAILREADER in such a way that only this single letter is read. 23. * - Do something to the text when the scroll is enchanted or cancelled. 24. * - Make the daemon always appear at a stairwell, and have it find a 25. * path to the hero. 26. * 27. * Note by Olaf Seibert: On the Amiga, we usually don't get mail. So we go 28. * through most of the effects at 'random' moments. 29. * Note by Paul Winner: The MSDOS port also 'fakes' the mail daemon at 30. * random intervals. 31. */ 32. 33. static boolean FDECL(md_start,(coord *)); 34. static boolean FDECL(md_stop,(coord *, coord *)); 35. static boolean FDECL(md_rush,(struct monst *,int,int)); 36. static void FDECL(newmail, (struct mail_info *)); 37. 38. extern char *viz_rmin, *viz_rmax; /* line-of-sight limits (vision.c) */ 39. 40. #ifdef OVL0 41. 42. # if !defined(UNIX) && !defined(VMS) 43. int mustgetmail = -1; 44. # endif 45. 46. #endif /* OVL0 */ 47. #ifdef OVLB 48. 49. # ifdef UNIX 50. #include <sys/stat.h> 51. #include <pwd.h> 52. /* DON'T trust all Unices to declare getpwuid() in <pwd.h> */ 53. # if !defined(_BULL_SOURCE) && !defined(__sgi) && !defined(_M_UNIX) 54. # if !defined(SUNOS4) && !(defined(ULTRIX) && defined(__GNUC__)) 55. /* DO trust all SVR4 to typedef uid_t in <sys/types.h> (probably to a long) */ 56. # if defined(POSIX_TYPES) || defined(SVR4) || defined(HPUX) 57. extern struct passwd *FDECL(getpwuid,(uid_t)); 58. # else 59. extern struct passwd *FDECL(getpwuid,(int)); 60. # endif 61. # endif 62. # endif 63. static struct stat omstat,nmstat; 64. static char *mailbox = (char *)0; 65. static long laststattime; 66. 67. # ifdef AMS /* Just a placeholder for AMS */ 68. # define MAILPATH "/dev/null" 69. # else 70. # if defined(BSD) || defined(ULTRIX) 71. # define MAILPATH "/usr/spool/mail/" 72. # endif 73. # if defined(SYSV) || defined(HPUX) 74. # define MAILPATH "/usr/mail/" 75. # endif 76. # endif /* AMS */ 77. 78. void 79. getmailstatus() 80. { 81. if(!mailbox && !(mailbox = getenv("MAIL"))) { 82. # ifdef MAILPATH 83. # ifdef AMS 84. struct passwd ppasswd; 85. 86. (void) memcpy(&ppasswd, getpwuid(getuid()), sizeof(struct passwd)); 87. if (ppasswd.pw_dir) { 88. mailbox = (char *) alloc((unsigned) strlen(ppasswd.pw_dir)+sizeof(AMS_MAILBOX)); 89. Strcpy(mailbox, ppasswd.pw_dir); 90. Strcat(mailbox, AMS_MAILBOX); 91. } else 92. return; 93. # else 94. mailbox = (char *) alloc(sizeof(MAILPATH)+8); 95. Strcpy(mailbox, MAILPATH); 96. Strcat(mailbox, getpwuid(getuid())->pw_name); 97. # endif /* AMS */ 98. # else 99. return; 100. # endif 101. } 102. if(stat(mailbox, &omstat)){ 103. # ifdef PERMANENT_MAILBOX 104. pline("Cannot get status of MAIL=\"%s\".", mailbox); 105. mailbox = 0; 106. # else 107. omstat.st_mtime = 0; 108. # endif 109. } 110. } 111. # endif /* UNIX */ 112. 113. #endif /* OVLB */ 114. #ifdef OVL0 115. 116. /* 117. * Pick coordinates for a starting position for the mail daemon. Called 118. * from newmail() and newphone(). 119. */ 120. static boolean 121. md_start(startp) 122. coord *startp; 123. { 124. coord testcc; /* scratch coordinates */ 125. int row; /* current row we are checking */ 126. int lax; /* if TRUE, pick a position in sight. */ 127. int dd; /* distance to current point */ 128. int max_distance; /* max distance found so far */ 129. 130. /* 131. * If blind and not telepathic, then it doesn't matter what we pick --- 132. * the hero is not going to see it anyway. So pick a nearby position. 133. */ 134. if (Blind && !Telepat) { 135. if (!enexto(startp, u.ux, u.uy, (struct permonst *) 0)) 136. return FALSE; /* no good posiitons */ 137. return TRUE; 138. } 139. 140. /* 141. * Arrive at an up or down stairwell if it is in line of sight from the 142. * hero. 143. */ 144. if (couldsee(upstair.sx, upstair.sy)) { 145. startp->x = upstair.sx; 146. startp->y = upstair.sy; 147. return TRUE; 148. } 149. if (couldsee(dnstair.sx, dnstair.sy)) { 150. startp->x = dnstair.sx; 151. startp->y = dnstair.sy; 152. return TRUE; 153. } 154. 155. /* 156. * Try to pick a location out of sight next to the farthest position away 157. * from the hero. If this fails, try again, just picking the farthest 158. * position that could be seen. What we really ought to be doing is 159. * finding a path from a stairwell... 160. * 161. * The arrays viz_rmin[] and viz_rmax[] are set even when blind. These 162. * are the LOS limits for each row. 163. */ 164. lax = 0; /* be picky */ 165. max_distance = -1; 166. retry: 167. for (row = 0; row < ROWNO; row++) { 168. if (viz_rmin[row] < viz_rmax[row]) { 169. /* There are valid positions on this row. */ 170. dd = distu(viz_rmin[row],row); 171. if (dd > max_distance) { 172. if (lax) { 173. max_distance = dd; 174. startp->y = row; 175. startp->x = viz_rmin[row]; 176. 177. } else if (enexto(&testcc, (xchar)viz_rmin[row], row, 178. (struct permonst *) 0) && 179. !cansee(testcc.x, testcc.y) && 180. couldsee(testcc.x, testcc.y)) { 181. max_distance = dd; 182. *startp = testcc; 183. } 184. } 185. dd = distu(viz_rmax[row],row); 186. if (dd > max_distance) { 187. if (lax) { 188. max_distance = dd; 189. startp->y = row; 190. startp->x = viz_rmax[row]; 191. 192. } else if (enexto(&testcc, (xchar)viz_rmax[row], row, 193. (struct permonst *) 0) && 194. !cansee(testcc.x,testcc.y) && 195. couldsee(testcc.x, testcc.y)) { 196. 197. max_distance = dd; 198. *startp = testcc; 199. } 200. } 201. } 202. } 203. 204. if (max_distance < 0) { 205. if (!lax) { 206. lax = 1; /* just find a position */ 207. goto retry; 208. } 209. return FALSE; 210. } 211. 212. return TRUE; 213. } 214. 215. /* 216. * Try to choose a stopping point as near as possible to the starting 217. * position while still adjacent to the hero. If all else fails, try 218. * enexto(). Use enexto() as a last resort because enexto() chooses 219. * its point randomly, which is not what we want. 220. */ 221. static boolean 222. md_stop(stopp, startp) 223. coord *stopp; /* stopping position (we fill it in) */ 224. coord *startp; /* starting positon (read only) */ 225. { 226. int x, y, distance, min_distance = -1; 227. 228. for (x = u.ux-1; x <= u.ux+1; x++) 229. for (y = u.uy-1; y <= u.uy+1; y++) { 230. if (!isok(x, y) || (x == u.ux && y == u.uy)) continue; 231. 232. if (ACCESSIBLE(levl[x][y].typ) && !MON_AT(x,y)) { 233. distance = dist2(x,y,startp->x,startp->y); 234. if (min_distance < 0 || distance < min_distance || 235. (distance == min_distance && rn2(2))) { 236. stopp->x = x; 237. stopp->y = y; 238. min_distance = distance; 239. } 240. } 241. } 242. 243. /* If we didn't find a good spot, try enexto(). */ 244. if (min_distance < 0 && 245. !enexto(stopp, u.ux, u.uy, &mons[PM_MAIL_DAEMON])) 246. return FALSE; 247. 248. return TRUE; 249. } 250. 251. /* Let the mail daemon have a larger vocabulary. */ 252. static NEARDATA const char *mail_text[] = { 253. "Gangway!", 254. "Look out!", 255. "Pardon me!" 256. }; 257. #define md_exclamations() (mail_text[rn2(3)]) 258. 259. /* 260. * Make the mail daemon run through the dungeon. The daemon will run over 261. * any monsters that are in its path, but will replace them later. Return 262. * FALSE if the md gets stuck in a position where there is a monster. Return 263. * TRUE otherwise. 264. */ 265. static boolean 266. md_rush(md,tx,ty) 267. struct monst *md; 268. register int tx, ty; /* destination of mail daemon */ 269. { 270. struct monst *mon; /* displaced monster */ 271. register int dx, dy; /* direction counters */ 272. int fx = md->mx, fy = md->my; /* current location */ 273. int nfx = fx, nfy = fy, /* new location */ 274. d1, d2; /* shortest distances */ 275. 276. /* 277. * It is possible that the monster at (fx,fy) is not the md when: 278. * the md rushed the hero and failed, and is now starting back. 279. */ 280. if (m_at(fx, fy) == md) { 281. remove_monster(fx, fy); /* pick up from orig position */ 282. newsym(fx, fy); 283. } 284. 285. /* 286. * At the beginning and exit of this loop, md is not placed in the 287. * dungeon. 288. */ 289. while (1) { 290. /* Find a good location next to (fx,fy) closest to (tx,ty). */ 291. d1 = dist2(fx,fy,tx,ty); 292. for (dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 293. if ((dx || dy) && isok(fx+dx,fy+dy) && 294. !IS_STWALL(levl[fx+dx][fy+dy].typ)) { 295. d2 = dist2(fx+dx,fy+dy,tx,ty); 296. if (d2 < d1) { 297. d1 = d2; 298. nfx = fx+dx; 299. nfy = fy+dy; 300. } 301. } 302. 303. /* Break if the md couldn't find a new position. */ 304. if (nfx == fx && nfy == fy) break; 305. 306. fx = nfx; /* this is our new position */ 307. fy = nfy; 308. 309. /* Break if the md reaches its destination. */ 310. if (fx == tx && fy == ty) break; 311. 312. if ((mon = m_at(fx,fy)) != 0) /* save monster at this position */ 313. verbalize(md_exclamations()); 314. else if (fx == u.ux && fy == u.uy) 315. verbalize("Excuse me."); 316. 317. place_monster(md,fx,fy); /* put md down */ 318. newsym(fx,fy); /* see it */ 319. flush_screen(0); /* make sure md shows up */ 320. delay_output(); /* wait a little bit */ 321. 322. /* Remove md from the dungeon. Restore original mon, if necessary. */ 323. if (mon) { 324. if ((mon->mx != fx) || (mon->my != fy)) 325. place_worm_seg(mon, fx, fy); 326. else 327. place_monster(mon, fx, fy); 328. } else 329. remove_monster(fx, fy); 330. newsym(fx,fy); 331. } 332. 333. /* 334. * Check for a monster at our stopping position (this is possible, but 335. * very unlikely). If one exists, then have the md leave in disgust. 336. */ 337. if ((mon = m_at(fx, fy)) != 0) { 338. place_monster(md, fx, fy); /* display md with text below */ 339. newsym(fx, fy); 340. verbalize("This place's too crowded. I'm outta here."); 341. 342. if ((mon->mx != fx) || (mon->my != fy)) /* put mon back */ 343. place_worm_seg(mon, fx, fy); 344. else 345. place_monster(mon, fx, fy); 346. 347. newsym(fx, fy); 348. return FALSE; 349. } 350. 351. place_monster(md, fx, fy); /* place at final spot */ 352. newsym(fx, fy); 353. flush_screen(0); 354. delay_output(); /* wait a little bit */ 355. 356. return TRUE; 357. } 358. 359. /* Deliver a scroll of mail. */ 360. /*ARGSUSED*/ 361. static void 362. newmail(info) 363. struct mail_info *info; 364. { 365. struct monst *md; 366. coord start, stop; 367. boolean message_seen = FALSE; 368. 369. /* Try to find good starting and stopping places. */ 370. if (!md_start(&start) || !md_stop(&stop,&start)) goto give_up; 371. 372. /* Make the daemon. Have it rush towards the hero. */ 373. if (!(md = makemon(&mons[PM_MAIL_DAEMON], start.x, start.y))) goto give_up; 374. if (!md_rush(md, stop.x, stop.y)) goto go_back; 375. 376. message_seen = TRUE; 377. verbalize("Hello, %s! %s.", plname, info->display_txt); 378. 379. if (info->message_typ) { 380. struct obj *obj = mksobj(SCR_MAIL, FALSE, FALSE); 381. if (distu(md->mx,md->my) > 2) 382. verbalize("Catch!"); 383. display_nhwindow(WIN_MESSAGE, FALSE); 384. if (info->object_nam) { 385. obj = oname(obj, info->object_nam); 386. if (info->response_cmd) { /*(hide extension of the obj name)*/ 387. int namelth = info->response_cmd - info->object_nam - 1; 388. if ( namelth <= 0 || namelth >= (int) obj->onamelth ) 389. impossible("mail delivery screwed up"); 390. else 391. *(ONAME(obj) + namelth) = '\0'; 392. /* Note: renaming object will discard the hidden command. */ 393. } 394. } 395. obj = hold_another_object(obj, "Oops!", 396. (const char *)0, (const char *)0); 397. } 398. 399. /* zip back to starting location */ 400. go_back: 401. (void) md_rush(md, start.x, start.y); 402. mongone(md); 403. /* deliver some classes of messages even if no daemon ever shows up */ 404. give_up: 405. if (!message_seen && info->message_typ == MSG_OTHER) 406. pline("Hark! \"%s.\"", info->display_txt); 407. } 408. 409. # if !defined(UNIX) && !defined(VMS) 410. 411. void 412. ckmailstatus() 413. { 414. if (u.uswallow || !flags.biff) return; 415. if (mustgetmail < 0) { 416. #if defined(AMIGA) || defined(MSDOS) 417. mustgetmail=(moves<2000)?(100+rn2(2000)):(2000+rn2(3000)); 418. #endif 419. return; 420. } 421. if (--mustgetmail <= 0) { 422. static struct mail_info 423. deliver = {MSG_MAIL,"I have some mail for you",0,0}; 424. newmail(&deliver); 425. mustgetmail = -1; 426. } 427. } 428. 429. /*ARGSUSED*/ 430. void 431. readmail(otmp) 432. struct obj *otmp; 433. { 434. char *junk[]={ 435. "Please disregard previous letter.", 436. "Welcome to NetHack 3.2!", 437. #ifdef AMIGA 438. "Only Amiga makes it possible.", 439. "CATS have all the answers.", 440. #endif 441. "Report bugs to nethack-bugs@linc.cis.upenn.edu" 442. }; 443. 444. pline("It reads: \"%s\"", junk[rn2(SIZE(junk))]); 445. } 446. 447. # endif /* !UNIX && !VMS */ 448. 449. # ifdef UNIX 450. 451. void 452. ckmailstatus() 453. { 454. if(!mailbox || u.uswallow || !flags.biff 455. # ifdef MAILCKFREQ 456. || moves < laststattime + MAILCKFREQ 457. # endif 458. ) 459. return; 460. 461. laststattime = moves; 462. if(stat(mailbox, &nmstat)){ 463. # ifdef PERMANENT_MAILBOX 464. pline("Cannot get status of MAIL=\"%s\" anymore.", mailbox); 465. mailbox = 0; 466. # else 467. nmstat.st_mtime = 0; 468. # endif 469. } else if(nmstat.st_mtime > omstat.st_mtime) { 470. if (nmstat.st_size) { 471. static struct mail_info deliver = { 472. # ifndef NO_MAILREADER 473. MSG_MAIL, "I have some mail for you", 474. # else 475. /* suppress creation and delivery of scroll of mail */ 476. MSG_OTHER, "You have some mail in the outside world", 477. # endif 478. 0, 0 479. }; 480. newmail(&deliver); 481. } 482. getmailstatus(); /* might be too late ... */ 483. } 484. } 485. 486. /*ARGSUSED*/ 487. void 488. readmail(otmp) 489. struct obj *otmp; 490. { 491. # ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 492. register const char *mr = 0; 493. 494. display_nhwindow(WIN_MESSAGE, FALSE); 495. if(!(mr = getenv("MAILREADER"))) 496. mr = DEF_MAILREADER; 497. 498. if(child(1)){ 499. (void) execl(mr, mr, (char *)0); 500. terminate(EXIT_FAILURE); 501. } 502. # else 503. # ifndef AMS /* AMS mailboxes are directories */ 504. display_file(mailbox, TRUE); 505. # endif /* AMS */ 506. # endif /* DEF_MAILREADER */ 507. 508. /* get new stat; not entirely correct: there is a small time 509. window where we do not see new mail */ 510. getmailstatus(); 511. } 512. 513. # endif /* UNIX */ 514. 515. # ifdef VMS 516. 517. volatile int broadcasts = 0; 518. 519. void 520. ckmailstatus() 521. { 522. struct mail_info *brdcst, *parse_next_broadcast(); 523. 524. if(u.uswallow || !flags.biff) return; 525. 526. while (broadcasts > 0) { /* process all trapped broadcasts [until] */ 527. broadcasts--; 528. if ((brdcst = parse_next_broadcast()) != 0) { 529. newmail(brdcst); 530. break; /* only handle one real message at a time */ 531. } 532. } 533. } 534. 535. void 536. readmail(otmp) 537. struct obj *otmp; 538. { 539. # ifdef SHELL /* can't access mail reader without spawning subprocess */ 540. const char *txt, *cmd; 541. char *p, buf[BUFSZ], qbuf[BUFSZ]; 542. int len; 543. 544. /* there should be a command hidden beyond the object name */ 545. txt = otmp->onamelth ? ONAME(otmp) : ""; 546. len = strlen(txt); 547. cmd = (len + 1 < otmp->onamelth) ? txt + len + 1 : (char *) 0; 548. if (!cmd || !*cmd) cmd = "SPAWN"; 549. 550. Sprintf(qbuf, "System command (%s)", cmd); 551. getlin(qbuf, buf); 552. if (*buf != '\033') { 553. for (p = eos(buf); p > buf; *p = '\0') 554. if (*--p != ' ') break; /* strip trailing spaces */ 555. if (*buf) cmd = buf; /* use user entered command */ 556. if (!strcmpi(cmd, "SPAWN") || !strcmp(cmd, "!")) 557. cmd = (char *) 0; /* interactive escape */ 558. 559. vms_doshell(cmd, TRUE); 560. (void) sleep(1); 561. } 562. # endif /* SHELL */ 563. } 564. 565. # endif /* VMS */ 566. 567. #endif /* OVL0 */ 568. 569. #endif /* MAIL */ 570. 571. /*mail.c*/
