Source:NetHack 3.3.0/mail.c
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Below is the full text to mail.c from the source code of NetHack 3.3.0. To link to a particular line, write [[NetHack 3.3.0/mail.c#line123]], for example.
Warning! This is the source code from an old release. For the latest release, 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 3.3 1999/08/24 */ 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. /* 11. * Notify user when new mail has arrived. Idea by Merlyn Leroy. 12. * 13. * The mail daemon can move with less than usual restraint. It can: 14. * - move diagonally from a door 15. * - use secret and closed doors 16. * - run through a monster ("Gangway!", etc.) 17. * - run over pools & traps 18. * 19. * Possible extensions: 20. * - Open the file MAIL and do fstat instead of stat for efficiency. 21. * (But sh uses stat, so this cannot be too bad.) 22. * - Examine the mail and produce a scroll of mail named "From somebody". 23. * - Invoke MAILREADER in such a way that only this single letter is read. 24. * - Do something to the text when the scroll is enchanted or cancelled. 25. * - Make the daemon always appear at a stairwell, and have it find a 26. * path to the hero. 27. * 28. * Note by Olaf Seibert: On the Amiga, we usually don't get mail. So we go 29. * through most of the effects at 'random' moments. 30. * Note by Paul Winner: The MSDOS port also 'fakes' the mail daemon at 31. * random intervals. 32. */ 33. 34. STATIC_DCL boolean FDECL(md_start,(coord *)); 35. STATIC_DCL boolean FDECL(md_stop,(coord *, coord *)); 36. STATIC_DCL boolean FDECL(md_rush,(struct monst *,int,int)); 37. STATIC_DCL void FDECL(newmail, (struct mail_info *)); 38. 39. extern char *viz_rmin, *viz_rmax; /* line-of-sight limits (vision.c) */ 40. 41. #ifdef OVL0 42. 43. # if !defined(UNIX) && !defined(VMS) && !defined(LAN_MAIL) 44. int mustgetmail = -1; 45. # endif 46. 47. #endif /* OVL0 */ 48. #ifdef OVLB 49. 50. # ifdef UNIX 51. #include <sys/stat.h> 52. #include <pwd.h> 53. /* DON'T trust all Unices to declare getpwuid() in <pwd.h> */ 54. # if !defined(_BULL_SOURCE) && !defined(__sgi) && !defined(_M_UNIX) 55. # if !defined(SUNOS4) && !(defined(ULTRIX) && defined(__GNUC__)) 56. /* DO trust all SVR4 to typedef uid_t in <sys/types.h> (probably to a long) */ 57. # if defined(POSIX_TYPES) || defined(SVR4) || defined(HPUX) 58. extern struct passwd *FDECL(getpwuid,(uid_t)); 59. # else 60. extern struct passwd *FDECL(getpwuid,(int)); 61. # endif 62. # endif 63. # endif 64. static struct stat omstat,nmstat; 65. static char *mailbox = (char *)0; 66. static long laststattime; 67. 68. # ifdef AMS /* Just a placeholder for AMS */ 69. # define MAILPATH "/dev/null" 70. # else 71. # ifdef LINUX 72. # define MAILPATH "/var/spool/mail" 73. # else 74. # if defined(BSD) || defined(ULTRIX) 75. # define MAILPATH "/usr/spool/mail/" 76. # endif 77. # if defined(SYSV) || defined(HPUX) 78. # define MAILPATH "/usr/mail/" 79. # endif 80. # endif /* LINUX */ 81. # endif /* AMS */ 82. 83. void 84. getmailstatus() 85. { 86. if(!mailbox && !(mailbox = getenv("MAIL"))) { 87. # ifdef MAILPATH 88. # ifdef AMS 89. struct passwd ppasswd; 90. 91. (void) memcpy(&ppasswd, getpwuid(getuid()), sizeof(struct passwd)); 92. if (ppasswd.pw_dir) { 93. mailbox = (char *) alloc((unsigned) strlen(ppasswd.pw_dir)+sizeof(AMS_MAILBOX)); 94. Strcpy(mailbox, ppasswd.pw_dir); 95. Strcat(mailbox, AMS_MAILBOX); 96. } else 97. return; 98. # else 99. mailbox = (char *) alloc(sizeof(MAILPATH)+8); 100. Strcpy(mailbox, MAILPATH); 101. Strcat(mailbox, getpwuid(getuid())->pw_name); 102. # endif /* AMS */ 103. # else 104. return; 105. # endif 106. } 107. if(stat(mailbox, &omstat)){ 108. # ifdef PERMANENT_MAILBOX 109. pline("Cannot get status of MAIL=\"%s\".", mailbox); 110. mailbox = 0; 111. # else 112. omstat.st_mtime = 0; 113. # endif 114. } 115. } 116. # endif /* UNIX */ 117. 118. #endif /* OVLB */ 119. #ifdef OVL0 120. 121. /* 122. * Pick coordinates for a starting position for the mail daemon. Called 123. * from newmail() and newphone(). 124. */ 125. STATIC_OVL boolean 126. md_start(startp) 127. coord *startp; 128. { 129. coord testcc; /* scratch coordinates */ 130. int row; /* current row we are checking */ 131. int lax; /* if TRUE, pick a position in sight. */ 132. int dd; /* distance to current point */ 133. int max_distance; /* max distance found so far */ 134. 135. /* 136. * If blind and not telepathic, then it doesn't matter what we pick --- 137. * the hero is not going to see it anyway. So pick a nearby position. 138. */ 139. if (Blind && !Blind_telepat) { 140. if (!enexto(startp, u.ux, u.uy, (struct permonst *) 0)) 141. return FALSE; /* no good posiitons */ 142. return TRUE; 143. } 144. 145. /* 146. * Arrive at an up or down stairwell if it is in line of sight from the 147. * hero. 148. */ 149. if (couldsee(upstair.sx, upstair.sy)) { 150. startp->x = upstair.sx; 151. startp->y = upstair.sy; 152. return TRUE; 153. } 154. if (couldsee(dnstair.sx, dnstair.sy)) { 155. startp->x = dnstair.sx; 156. startp->y = dnstair.sy; 157. return TRUE; 158. } 159. 160. /* 161. * Try to pick a location out of sight next to the farthest position away 162. * from the hero. If this fails, try again, just picking the farthest 163. * position that could be seen. What we really ought to be doing is 164. * finding a path from a stairwell... 165. * 166. * The arrays viz_rmin[] and viz_rmax[] are set even when blind. These 167. * are the LOS limits for each row. 168. */ 169. lax = 0; /* be picky */ 170. max_distance = -1; 171. retry: 172. for (row = 0; row < ROWNO; row++) { 173. if (viz_rmin[row] < viz_rmax[row]) { 174. /* There are valid positions on this row. */ 175. dd = distu(viz_rmin[row],row); 176. if (dd > max_distance) { 177. if (lax) { 178. max_distance = dd; 179. startp->y = row; 180. startp->x = viz_rmin[row]; 181. 182. } else if (enexto(&testcc, (xchar)viz_rmin[row], row, 183. (struct permonst *) 0) && 184. !cansee(testcc.x, testcc.y) && 185. couldsee(testcc.x, testcc.y)) { 186. max_distance = dd; 187. *startp = testcc; 188. } 189. } 190. dd = distu(viz_rmax[row],row); 191. if (dd > max_distance) { 192. if (lax) { 193. max_distance = dd; 194. startp->y = row; 195. startp->x = viz_rmax[row]; 196. 197. } else if (enexto(&testcc, (xchar)viz_rmax[row], row, 198. (struct permonst *) 0) && 199. !cansee(testcc.x,testcc.y) && 200. couldsee(testcc.x, testcc.y)) { 201. 202. max_distance = dd; 203. *startp = testcc; 204. } 205. } 206. } 207. } 208. 209. if (max_distance < 0) { 210. if (!lax) { 211. lax = 1; /* just find a position */ 212. goto retry; 213. } 214. return FALSE; 215. } 216. 217. return TRUE; 218. } 219. 220. /* 221. * Try to choose a stopping point as near as possible to the starting 222. * position while still adjacent to the hero. If all else fails, try 223. * enexto(). Use enexto() as a last resort because enexto() chooses 224. * its point randomly, which is not what we want. 225. */ 226. STATIC_OVL boolean 227. md_stop(stopp, startp) 228. coord *stopp; /* stopping position (we fill it in) */ 229. coord *startp; /* starting positon (read only) */ 230. { 231. int x, y, distance, min_distance = -1; 232. 233. for (x = u.ux-1; x <= u.ux+1; x++) 234. for (y = u.uy-1; y <= u.uy+1; y++) { 235. if (!isok(x, y) || (x == u.ux && y == u.uy)) continue; 236. 237. if (ACCESSIBLE(levl[x][y].typ) && !MON_AT(x,y)) { 238. distance = dist2(x,y,startp->x,startp->y); 239. if (min_distance < 0 || distance < min_distance || 240. (distance == min_distance && rn2(2))) { 241. stopp->x = x; 242. stopp->y = y; 243. min_distance = distance; 244. } 245. } 246. } 247. 248. /* If we didn't find a good spot, try enexto(). */ 249. if (min_distance < 0 && 250. !enexto(stopp, u.ux, u.uy, &mons[PM_MAIL_DAEMON])) 251. return FALSE; 252. 253. return TRUE; 254. } 255. 256. /* Let the mail daemon have a larger vocabulary. */ 257. static NEARDATA const char *mail_text[] = { 258. "Gangway!", 259. "Look out!", 260. "Pardon me!" 261. }; 262. #define md_exclamations() (mail_text[rn2(3)]) 263. 264. /* 265. * Make the mail daemon run through the dungeon. The daemon will run over 266. * any monsters that are in its path, but will replace them later. Return 267. * FALSE if the md gets stuck in a position where there is a monster. Return 268. * TRUE otherwise. 269. */ 270. STATIC_OVL boolean 271. md_rush(md,tx,ty) 272. struct monst *md; 273. register int tx, ty; /* destination of mail daemon */ 274. { 275. struct monst *mon; /* displaced monster */ 276. register int dx, dy; /* direction counters */ 277. int fx = md->mx, fy = md->my; /* current location */ 278. int nfx = fx, nfy = fy, /* new location */ 279. d1, d2; /* shortest distances */ 280. 281. /* 282. * It is possible that the monster at (fx,fy) is not the md when: 283. * the md rushed the hero and failed, and is now starting back. 284. */ 285. if (m_at(fx, fy) == md) { 286. remove_monster(fx, fy); /* pick up from orig position */ 287. newsym(fx, fy); 288. } 289. 290. /* 291. * At the beginning and exit of this loop, md is not placed in the 292. * dungeon. 293. */ 294. while (1) { 295. /* Find a good location next to (fx,fy) closest to (tx,ty). */ 296. d1 = dist2(fx,fy,tx,ty); 297. for (dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 298. if ((dx || dy) && isok(fx+dx,fy+dy) && 299. !IS_STWALL(levl[fx+dx][fy+dy].typ)) { 300. d2 = dist2(fx+dx,fy+dy,tx,ty); 301. if (d2 < d1) { 302. d1 = d2; 303. nfx = fx+dx; 304. nfy = fy+dy; 305. } 306. } 307. 308. /* Break if the md couldn't find a new position. */ 309. if (nfx == fx && nfy == fy) break; 310. 311. fx = nfx; /* this is our new position */ 312. fy = nfy; 313. 314. /* Break if the md reaches its destination. */ 315. if (fx == tx && fy == ty) break; 316. 317. if ((mon = m_at(fx,fy)) != 0) /* save monster at this position */ 318. verbalize(md_exclamations()); 319. else if (fx == u.ux && fy == u.uy) 320. verbalize("Excuse me."); 321. 322. place_monster(md,fx,fy); /* put md down */ 323. newsym(fx,fy); /* see it */ 324. flush_screen(0); /* make sure md shows up */ 325. delay_output(); /* wait a little bit */ 326. 327. /* Remove md from the dungeon. Restore original mon, if necessary. */ 328. if (mon) { 329. if ((mon->mx != fx) || (mon->my != fy)) 330. place_worm_seg(mon, fx, fy); 331. else 332. place_monster(mon, fx, fy); 333. } else 334. remove_monster(fx, fy); 335. newsym(fx,fy); 336. } 337. 338. /* 339. * Check for a monster at our stopping position (this is possible, but 340. * very unlikely). If one exists, then have the md leave in disgust. 341. */ 342. if ((mon = m_at(fx, fy)) != 0) { 343. place_monster(md, fx, fy); /* display md with text below */ 344. newsym(fx, fy); 345. verbalize("This place's too crowded. I'm outta here."); 346. 347. if ((mon->mx != fx) || (mon->my != fy)) /* put mon back */ 348. place_worm_seg(mon, fx, fy); 349. else 350. place_monster(mon, fx, fy); 351. 352. newsym(fx, fy); 353. return FALSE; 354. } 355. 356. place_monster(md, fx, fy); /* place at final spot */ 357. newsym(fx, fy); 358. flush_screen(0); 359. delay_output(); /* wait a little bit */ 360. 361. return TRUE; 362. } 363. 364. /* Deliver a scroll of mail. */ 365. /*ARGSUSED*/ 366. STATIC_OVL void 367. newmail(info) 368. struct mail_info *info; 369. { 370. struct monst *md; 371. coord start, stop; 372. boolean message_seen = FALSE; 373. 374. /* Try to find good starting and stopping places. */ 375. if (!md_start(&start) || !md_stop(&stop,&start)) goto give_up; 376. 377. /* Make the daemon. Have it rush towards the hero. */ 378. if (!(md = makemon(&mons[PM_MAIL_DAEMON], start.x, start.y, NO_MM_FLAGS))) 379. goto give_up; 380. if (!md_rush(md, stop.x, stop.y)) goto go_back; 381. 382. message_seen = TRUE; 383. verbalize("%s, %s! %s.", Hello(), plname, info->display_txt); 384. 385. if (info->message_typ) { 386. struct obj *obj = mksobj(SCR_MAIL, FALSE, FALSE); 387. if (distu(md->mx,md->my) > 2) 388. verbalize("Catch!"); 389. display_nhwindow(WIN_MESSAGE, FALSE); 390. if (info->object_nam) { 391. obj = oname(obj, info->object_nam); 392. if (info->response_cmd) { /*(hide extension of the obj name)*/ 393. int namelth = info->response_cmd - info->object_nam - 1; 394. if ( namelth <= 0 || namelth >= (int) obj->onamelth ) 395. impossible("mail delivery screwed up"); 396. else 397. *(ONAME(obj) + namelth) = '\0'; 398. /* Note: renaming object will discard the hidden command. */ 399. } 400. } 401. obj = hold_another_object(obj, "Oops!", 402. (const char *)0, (const char *)0); 403. } 404. 405. /* zip back to starting location */ 406. go_back: 407. (void) md_rush(md, start.x, start.y); 408. mongone(md); 409. /* deliver some classes of messages even if no daemon ever shows up */ 410. give_up: 411. if (!message_seen && info->message_typ == MSG_OTHER) 412. pline("Hark! \"%s.\"", info->display_txt); 413. } 414. 415. # if !defined(UNIX) && !defined(VMS) && !defined(LAN_MAIL) 416. 417. void 418. ckmailstatus() 419. { 420. if (u.uswallow || !flags.biff) return; 421. if (mustgetmail < 0) { 422. #if defined(AMIGA) || defined(MSDOS) 423. mustgetmail=(moves<2000)?(100+rn2(2000)):(2000+rn2(3000)); 424. #endif 425. return; 426. } 427. if (--mustgetmail <= 0) { 428. static struct mail_info 429. deliver = {MSG_MAIL,"I have some mail for you",0,0}; 430. newmail(&deliver); 431. mustgetmail = -1; 432. } 433. } 434. 435. /*ARGSUSED*/ 436. void 437. readmail(otmp) 438. struct obj *otmp; 439. { 440. static char *junk[] = { 441. "Please disregard previous letter.", 442. "Welcome to NetHack.", 443. #ifdef AMIGA 444. "Only Amiga makes it possible.", 445. "CATS have all the answers.", 446. #endif 447. "Report bugs to <devteam@nethack.org>." 448. }; 449. 450. if (Blind) { 451. pline("Unfortunately you cannot see what it says."); 452. } else 453. pline("It reads: \"%s\"", junk[rn2(SIZE(junk))]); 454. 455. } 456. 457. # endif /* !UNIX && !VMS && !LAN_MAIL */ 458. 459. # ifdef UNIX 460. 461. void 462. ckmailstatus() 463. { 464. if(!mailbox || u.uswallow || !flags.biff 465. # ifdef MAILCKFREQ 466. || moves < laststattime + MAILCKFREQ 467. # endif 468. ) 469. return; 470. 471. laststattime = moves; 472. if(stat(mailbox, &nmstat)){ 473. # ifdef PERMANENT_MAILBOX 474. pline("Cannot get status of MAIL=\"%s\" anymore.", mailbox); 475. mailbox = 0; 476. # else 477. nmstat.st_mtime = 0; 478. # endif 479. } else if(nmstat.st_mtime > omstat.st_mtime) { 480. if (nmstat.st_size) { 481. static struct mail_info deliver = { 482. # ifndef NO_MAILREADER 483. MSG_MAIL, "I have some mail for you", 484. # else 485. /* suppress creation and delivery of scroll of mail */ 486. MSG_OTHER, "You have some mail in the outside world", 487. # endif 488. 0, 0 489. }; 490. newmail(&deliver); 491. } 492. getmailstatus(); /* might be too late ... */ 493. } 494. } 495. 496. /*ARGSUSED*/ 497. void 498. readmail(otmp) 499. struct obj *otmp; 500. { 501. # ifdef DEF_MAILREADER /* This implies that UNIX is defined */ 502. register const char *mr = 0; 503. 504. display_nhwindow(WIN_MESSAGE, FALSE); 505. if(!(mr = getenv("MAILREADER"))) 506. mr = DEF_MAILREADER; 507. 508. if(child(1)){ 509. (void) execl(mr, mr, (char *)0); 510. terminate(EXIT_FAILURE); 511. } 512. # else 513. # ifndef AMS /* AMS mailboxes are directories */ 514. display_file(mailbox, TRUE); 515. # endif /* AMS */ 516. # endif /* DEF_MAILREADER */ 517. 518. /* get new stat; not entirely correct: there is a small time 519. window where we do not see new mail */ 520. getmailstatus(); 521. } 522. 523. # endif /* UNIX */ 524. 525. # ifdef VMS 526. 527. extern NDECL(struct mail_info *parse_next_broadcast); 528. 529. volatile int broadcasts = 0; 530. 531. void 532. ckmailstatus() 533. { 534. struct mail_info *brdcst; 535. 536. if (u.uswallow || !flags.biff) return; 537. 538. while (broadcasts > 0) { /* process all trapped broadcasts [until] */ 539. broadcasts--; 540. if ((brdcst = parse_next_broadcast()) != 0) { 541. newmail(brdcst); 542. break; /* only handle one real message at a time */ 543. } 544. } 545. } 546. 547. void 548. readmail(otmp) 549. struct obj *otmp; 550. { 551. # ifdef SHELL /* can't access mail reader without spawning subprocess */ 552. const char *txt, *cmd; 553. char *p, buf[BUFSZ], qbuf[BUFSZ]; 554. int len; 555. 556. /* there should be a command hidden beyond the object name */ 557. txt = otmp->onamelth ? ONAME(otmp) : ""; 558. len = strlen(txt); 559. cmd = (len + 1 < otmp->onamelth) ? txt + len + 1 : (char *) 0; 560. if (!cmd || !*cmd) cmd = "SPAWN"; 561. 562. Sprintf(qbuf, "System command (%s)", cmd); 563. getlin(qbuf, buf); 564. if (*buf != '\033') { 565. for (p = eos(buf); p > buf; *p = '\0') 566. if (*--p != ' ') break; /* strip trailing spaces */ 567. if (*buf) cmd = buf; /* use user entered command */ 568. if (!strcmpi(cmd, "SPAWN") || !strcmp(cmd, "!")) 569. cmd = (char *) 0; /* interactive escape */ 570. 571. vms_doshell(cmd, TRUE); 572. (void) sleep(1); 573. } 574. # endif /* SHELL */ 575. } 576. 577. # endif /* VMS */ 578. 579. # ifdef LAN_MAIL 580. 581. void 582. ckmailstatus() 583. { 584. static int laststattime = 0; 585. 586. if(u.uswallow || !flags.biff 587. # ifdef MAILCKFREQ 588. || moves < laststattime + MAILCKFREQ 589. # endif 590. ) 591. return; 592. 593. laststattime = moves; 594. if (lan_mail_check()) { 595. static struct mail_info deliver = { 596. # ifndef NO_MAILREADER 597. MSG_MAIL, "I have some mail for you", 598. # else 599. /* suppress creation and delivery of scroll of mail */ 600. MSG_OTHER, "You have some mail in the outside world", 601. # endif 602. 0, 0 603. }; 604. newmail(&deliver); 605. } 606. } 607. 608. /*ARGSUSED*/ 609. void 610. readmail(otmp) 611. struct obj *otmp; 612. { 613. lan_mail_read(otmp); 614. } 615. 616. # endif /* LAN_MAIL */ 617. 618. #endif /* OVL0 */ 619. 620. #endif /* MAIL */ 621. 622. /*mail.c*/