Source:Mail.c

Below is the full text to src/mail.c from NetHack 3.4.3. To link to a particular line, write [[mail.c#line123 ]], for example. 1.   /*	SCCS Id: @(#)mail.c	3.4	2002/01/13	*/ 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   52. #include  53. /* DON'T trust all Unices to declare getpwuid in  */ 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  (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.   # if !defined(MAILPATH) && defined(AMS)	/* Just a placeholder for AMS */ 69.  #  define MAILPATH "/dev/null" 70.  # endif 71.  # if !defined(MAILPATH) && (defined(LINUX) || defined(__osf__)) 72.  #  define MAILPATH "/var/spool/mail/" 73.  # endif 74.  # if !defined(MAILPATH) && defined(__FreeBSD__) 75.  #  define MAILPATH "/var/mail/" 76.  # endif 77.  # if !defined(MAILPATH) && (defined(BSD) || defined(ULTRIX)) 78.  #  define MAILPATH "/usr/spool/mail/" 79.  # endif 80.  # if !defined(MAILPATH) && (defined(SYSV) || defined(HPUX)) 81.  #  define MAILPATH "/usr/mail/" 82.  # endif 83.   84.   void 85.  getmailstatus 86.  {  87.   	if(!mailbox && !(mailbox = nh_getenv("MAIL"))) { 88.  #  ifdef MAILPATH 89.  #   ifdef AMS 90.  	        struct passwd ppasswd; 91.   92.   		(void) memcpy(&ppasswd, getpwuid(getuid), sizeof(struct passwd)); 93.  		if (ppasswd.pw_dir) { 94.  		     mailbox = (char *) alloc((unsigned) strlen(ppasswd.pw_dir)+sizeof(AMS_MAILBOX)); 95.  		     Strcpy(mailbox, ppasswd.pw_dir); 96.  		     Strcat(mailbox, AMS_MAILBOX); 97.  		} else 98.  		  return; 99.  #   else 100. 		const char *pw_name = getpwuid(getuid)->pw_name; 101. 		mailbox = (char *) alloc(sizeof(MAILPATH)+strlen(pw_name)); 102. 		Strcpy(mailbox, MAILPATH); 103. 		Strcat(mailbox, pw_name); 104. #  endif /* AMS */ 105. #  else 106. 		return; 107. #  endif 108. 	}  109.  	if(stat(mailbox, &omstat)){ 110. #  ifdef PERMANENT_MAILBOX 111. 		pline("Cannot get status of MAIL=\"%s\".", mailbox); 112. 		mailbox = 0; 113. #  else 114. 		omstat.st_mtime = 0; 115. #  endif 116. 	}  117.  }  118.  # endif /* UNIX */ 119.  120.  #endif /* OVLB */ 121. #ifdef OVL0 122.  123.  /*  124.   * Pick coordinates for a starting position for the mail daemon. Called 125.  * from newmail and newphone. 126.  */  127.  STATIC_OVL boolean 128. md_start(startp) 129.     coord *startp; 130. {  131.      coord testcc;	/* scratch coordinates */ 132.     int row;		/* current row we are checking */ 133.     int lax;		/* if TRUE, pick a position in sight. */ 134.      int dd;		/* distance to current point */ 135.     int max_distance;	/* max distance found so far */ 136.  137.      /*  138.       * If blind and not telepathic, then it doesn't matter what we pick --- 139.      * the hero is not going to see it anyway. So pick a nearby position. 140.      */  141.      if (Blind && !Blind_telepat) { 142. 	if (!enexto(startp, u.ux, u.uy, (struct permonst *) 0)) 143. 	    return FALSE;	/* no good posiitons */ 144. 	return TRUE; 145.     }  146.   147.      /*  148.       * Arrive at an up or down stairwell if it is in line of sight from the 149.      * hero. 150.      */  151.      if (couldsee(upstair.sx, upstair.sy)) { 152. 	startp->x = upstair.sx; 153. 	startp->y = upstair.sy; 154. 	return TRUE; 155.     }  156.      if (couldsee(dnstair.sx, dnstair.sy)) { 157. 	startp->x = dnstair.sx; 158. 	startp->y = dnstair.sy; 159. 	return TRUE; 160.     }  161.   162.      /*  163.       * Try to pick a location out of sight next to the farthest position away 164.      * from the hero. If this fails, try again, just picking the farthest 165.      * position that could be seen. What we really ought to be doing is 166. * finding a path from a stairwell... 167. * 168.       * The arrays viz_rmin[] and viz_rmax[] are set even when blind. These 169.      * are the LOS limits for each row. 170.      */  171.      lax = 0;	/* be picky */ 172.     max_distance = -1; 173. retry: 174.     for (row = 0; row < ROWNO; row++) { 175. 	if (viz_rmin[row] < viz_rmax[row]) { 176. 	    /* There are valid positions on this row. */ 177.  	    dd = distu(viz_rmin[row],row); 178. 	    if (dd > max_distance) { 179. 		if (lax) { 180. 		    max_distance = dd; 181. 		    startp->y = row; 182. 		    startp->x = viz_rmin[row]; 183. 		  184.  		} else if (enexto(&testcc, (xchar)viz_rmin[row], row, 185. 						(struct permonst *) 0) &&  186.  			   !cansee(testcc.x, testcc.y) &&  187.  			   couldsee(testcc.x, testcc.y)) { 188. 		    max_distance = dd; 189. 		    *startp = testcc; 190. 		}  191.  	    }  192.  	    dd = distu(viz_rmax[row],row); 193. 	    if (dd > max_distance) { 194. 		if (lax) { 195. 		    max_distance = dd; 196. 		    startp->y = row; 197. 		    startp->x = viz_rmax[row]; 198. 		  199.  		} else if (enexto(&testcc, (xchar)viz_rmax[row], row, 200. 						(struct permonst *) 0) &&  201.  			   !cansee(testcc.x,testcc.y) &&  202.  			   couldsee(testcc.x, testcc.y)) { 203.  204.  		    max_distance = dd; 205. 		    *startp = testcc; 206. 		}  207.  	    }  208.  	}  209.      }  210.   211.      if (max_distance < 0) { 212. 	if (!lax) { 213. 	    lax = 1;		/* just find a position */ 214. 	    goto retry; 215. 	}  216.  	return FALSE; 217.     }  218.   219.      return TRUE; 220. }  221.   222.  /*  223.   * Try to choose a stopping point as near as possible to the starting 224.  * position while still adjacent to the hero. If all else fails, try 225.  * enexto. Use enexto as a last resort because enexto chooses 226.  * its point randomly, which is not what we want. 227.  */  228.  STATIC_OVL boolean 229. md_stop(stopp, startp) 230.     coord *stopp;	/* stopping position (we fill it in) */ 231.     coord *startp;	/* starting positon (read only) */ 232. {  233.      int x, y, distance, min_distance = -1; 234.  235.      for (x = u.ux-1; x <= u.ux+1; x++) 236. 	for (y = u.uy-1; y <= u.uy+1; y++) { 237. 	    if (!isok(x, y) || (x == u.ux && y == u.uy)) continue; 238.  239.  	    if (ACCESSIBLE(levl[x][y].typ) && !MON_AT(x,y)) { 240. 		distance = dist2(x,y,startp->x,startp->y); 241. 		if (min_distance < 0 || distance < min_distance ||  242.  			(distance == min_distance && rn2(2))) { 243. 		    stopp->x = x;  244. stopp->y = y; 245. min_distance = distance; 246. 		}  247.  	    }  248.  	}  249.   250.      /* If we didn't find a good spot, try enexto. */ 251.      if (min_distance < 0 &&  252.  		!enexto(stopp, u.ux, u.uy, &mons[PM_MAIL_DAEMON])) 253. 	return FALSE; 254.  255.      return TRUE; 256. }  257.   258.  /* Let the mail daemon have a larger vocabulary. */ 259.  static NEARDATA const char *mail_text[] = { 260.     "Gangway!", 261.     "Look out!", 262.     "Pardon me!" 263. };  264.  #define md_exclamations	(mail_text[rn2(3)]) 265.  266.  /*  267.   * Make the mail daemon run through the dungeon. The daemon will run over 268.  * any monsters that are in its path, but will replace them later. Return 269.  * FALSE if the md gets stuck in a position where there is a monster. Return 270.  * TRUE otherwise. 271.  */  272.  STATIC_OVL boolean 273. md_rush(md,tx,ty) 274.     struct monst *md; 275.     register int tx, ty;		/* destination of mail daemon */ 276. {  277.      struct monst *mon;			/* displaced monster */ 278.     register int dx, dy;		/* direction counters */ 279.     int fx = md->mx, fy = md->my;	/* current location */ 280.     int nfx = fx, nfy = fy,		/* new location */ 281. 	d1, d2;				/* shortest distances */ 282.  283.      /*  284.       * It is possible that the monster at (fx,fy) is not the md when: 285.      * the md rushed the hero and failed, and is now starting back. 286.      */  287.      if (m_at(fx, fy) == md) { 288. 	remove_monster(fx, fy);		/* pick up from orig position */ 289. 	newsym(fx, fy); 290.     }  291.   292.      /*  293.       * At the beginning and exit of this loop, md is not placed in the 294.      * dungeon. 295.      */  296.      while (1) { 297. 	/* Find a good location next to (fx,fy) closest to (tx,ty). */ 298.  	d1 = dist2(fx,fy,tx,ty); 299. 	for (dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) 300. 	    if ((dx || dy) && isok(fx+dx,fy+dy) &&  301.  				       !IS_STWALL(levl[fx+dx][fy+dy].typ)) { 302. 		d2 = dist2(fx+dx,fy+dy,tx,ty); 303. 		if (d2 < d1) { 304. 		    d1 = d2; 305. 		    nfx = fx+dx; 306. 		    nfy = fy+dy; 307. 		}  308.  	    }  309.   310.  	/* Break if the md couldn't find a new position. */ 311.  	if (nfx == fx && nfy == fy) break; 312.  313.  	fx = nfx;			/* this is our new position */ 314. 	fy = nfy; 315.  316.  	/* Break if the md reaches its destination. */ 317.  	if (fx == tx && fy == ty) break; 318.  319.  	if ((mon = m_at(fx,fy)) != 0)	/* save monster at this position */ 320. 	    verbalize(md_exclamations); 321. 	else if (fx == u.ux && fy == u.uy) 322. 	    verbalize("Excuse me."); 323.  324.  	place_monster(md,fx,fy);	/* put md down */ 325. 	newsym(fx,fy);			/* see it */ 326. 	flush_screen(0);		/* make sure md shows up */ 327. 	delay_output;			/* wait a little bit */ 328.  329.  	/* Remove md from the dungeon. Restore original mon, if necessary. */ 330.  	if (mon) { 331. 	    if ((mon->mx != fx) || (mon->my != fy)) 332. 		place_worm_seg(mon, fx, fy); 333. 	    else 334. 		place_monster(mon, fx, fy); 335. 	} else 336. 	    remove_monster(fx, fy); 337. 	newsym(fx,fy); 338.     }  339.   340.      /*  341.       * Check for a monster at our stopping position (this is possible, but  342.       * very unlikely). If one exists, then have the md leave in disgust. 343.      */  344.      if ((mon = m_at(fx, fy)) != 0) { 345. 	place_monster(md, fx, fy);	/* display md with text below */ 346. 	newsym(fx, fy); 347. 	verbalize("This place's too crowded.  I'm outta here."); 348.  349.  	if ((mon->mx != fx) || (mon->my != fy))	/* put mon back */ 350. 	    place_worm_seg(mon, fx, fy); 351. 	else 352. 	    place_monster(mon, fx, fy); 353.  354.  	newsym(fx, fy); 355. 	return FALSE; 356.     }  357.   358.      place_monster(md, fx, fy);	/* place at final spot */ 359.     newsym(fx, fy); 360.     flush_screen(0); 361.     delay_output;			/* wait a little bit */ 362.  363.      return TRUE; 364. }  365.   366.  /* Deliver a scroll of mail. */ 367.  /*ARGSUSED*/ 368. STATIC_OVL void 369. newmail(info) 370. struct mail_info *info; 371. {  372.      struct monst *md; 373.     coord start, stop; 374.     boolean message_seen = FALSE; 375.  376.      /* Try to find good starting and stopping places. */ 377.      if (!md_start(&start) || !md_stop(&stop,&start)) goto give_up; 378.  379.      /* Make the daemon. Have it rush towards the hero. */ 380.      if (!(md = makemon(&mons[PM_MAIL_DAEMON], start.x, start.y, NO_MM_FLAGS))) 381. 	 goto give_up; 382.     if (!md_rush(md, stop.x, stop.y)) goto go_back; 383.  384.      message_seen = TRUE; 385.     verbalize("%s, %s!  %s.", Hello(md), plname, info->display_txt); 386.  387.      if (info->message_typ) { 388. 	struct obj *obj = mksobj(SCR_MAIL, FALSE, FALSE); 389. 	if (distu(md->mx,md->my) > 2) 390. 	    verbalize("Catch!"); 391. 	display_nhwindow(WIN_MESSAGE, FALSE); 392. 	if (info->object_nam) { 393. 	    obj = oname(obj, info->object_nam); 394. 	    if (info->response_cmd) {	/*(hide extension of the obj name)*/ 395. 		int namelth = info->response_cmd - info->object_nam - 1; 396. 		if ( namelth <= 0 || namelth >= (int) obj->onamelth ) 397. 		    impossible("mail delivery screwed up"); 398. 		else 399. 		    *(ONAME(obj) + namelth) = '\0'; 400. 		/* Note: renaming object will discard the hidden command. */ 401.  	    }  402.  	}  403.  	obj = hold_another_object(obj, "Oops!",  404.  				  (const char *)0, (const char *)0); 405.     }  406.   407.      /* zip back to starting location */ 408. go_back: 409.     (void) md_rush(md, start.x, start.y); 410.     mongone(md); 411.     /* deliver some classes of messages even if no daemon ever shows up */ 412. give_up: 413.     if (!message_seen && info->message_typ == MSG_OTHER) 414. 	pline("Hark!  \"%s.\"", info->display_txt); 415. }  416.   417.  # if !defined(UNIX) && !defined(VMS) && !defined(LAN_MAIL) 418.  419.  void 420. ckmailstatus 421. {  422.  	if (u.uswallow || !flags.biff) return; 423. 	if (mustgetmail < 0) { 424. #if defined(AMIGA) || defined(MSDOS) || defined(TOS) 425. 	    mustgetmail=(moves<2000)?(100+rn2(2000)):(2000+rn2(3000)); 426. #endif 427. 	    return; 428. 	}  429.  	if (--mustgetmail <= 0) { 430. 		static struct mail_info 431. 			deliver = {MSG_MAIL,"I have some mail for you",0,0}; 432. 		newmail(&deliver); 433. 		mustgetmail = -1; 434. 	}  435.  }  436.   437.  /*ARGSUSED*/ 438. void 439. readmail(otmp) 440. struct obj *otmp; 441. {  442.      static char *junk[] = { 443.     "Please disregard previous letter.", 444.     "Welcome to NetHack.", 445. #ifdef AMIGA 446.     "Only Amiga makes it possible.", 447.     "CATS have all the answers.", 448. #endif 449.     "Report bugs to .", 450.     "Invitation: Visit the NetHack web site at http://www.nethack.org!" 451.     };  452.   453.      if (Blind) { 454. 	pline("Unfortunately you cannot see what it says."); 455.     } else 456. 	pline("It reads:  \"%s\"", junk[rn2(SIZE(junk))]); 457.  458.  }  459.   460.  # endif /* !UNIX && !VMS && !LAN_MAIL */ 461.  462.  # ifdef UNIX 463.  464.  void 465. ckmailstatus 466. {  467.  	if(!mailbox || u.uswallow || !flags.biff  468.  #  ifdef MAILCKFREQ  469.  		    || moves < laststattime + MAILCKFREQ  470.  #  endif  471.  							) 472. 		return; 473.  474.  	laststattime = moves; 475. 	if(stat(mailbox, &nmstat)){ 476. #  ifdef PERMANENT_MAILBOX 477. 		pline("Cannot get status of MAIL=\"%s\" anymore.", mailbox); 478. 		mailbox = 0; 479. #  else 480. 		nmstat.st_mtime = 0; 481. #  endif 482. 	} else if(nmstat.st_mtime > omstat.st_mtime) { 483. 		if (nmstat.st_size) { 484. 		    static struct mail_info deliver = { 485. #  ifndef NO_MAILREADER 486. 			MSG_MAIL, "I have some mail for you", 487. #  else 488. 			/* suppress creation and delivery of scroll of mail */ 489. 			MSG_OTHER, "You have some mail in the outside world", 490. #  endif 491. 			0, 0  492.  		    };  493.  		    newmail(&deliver); 494. 		}  495.  		getmailstatus;	/* might be too late ... */ 496.  	}  497.  }  498.   499.  /*ARGSUSED*/ 500. void 501. readmail(otmp) 502. struct obj *otmp; 503. {  504.  #  ifdef DEF_MAILREADER			/* This implies that UNIX is defined */ 505. 	register const char *mr = 0; 506.  507.  	display_nhwindow(WIN_MESSAGE, FALSE); 508. 	if(!(mr = nh_getenv("MAILREADER"))) 509. 		mr = DEF_MAILREADER; 510.  511.  	if(child(1)){ 512. 		(void) execl(mr, mr, (char *)0); 513. 		terminate(EXIT_FAILURE); 514. 	}  515.  #  else 516. #   ifndef AMS				/* AMS mailboxes are directories */ 517. 	display_file(mailbox, TRUE); 518. #   endif /* AMS */ 519. #  endif /* DEF_MAILREADER */ 520.  521.  	/* get new stat; not entirely correct: there is a small time 522. 	   window where we do not see new mail */ 523. 	getmailstatus; 524. }  525.   526.  # endif /* UNIX */ 527.  528.  # ifdef VMS 529.  530.  extern NDECL(struct mail_info *parse_next_broadcast); 531.  532.  volatile int broadcasts = 0; 533.  534.  void 535. ckmailstatus 536. {  537.      struct mail_info *brdcst; 538.  539.      if (u.uswallow || !flags.biff) return; 540.  541.      while (broadcasts > 0) {	/* process all trapped broadcasts [until] */ 542. 	broadcasts--; 543. 	if ((brdcst = parse_next_broadcast) != 0) { 544. 	    newmail(brdcst); 545. 	    break;		/* only handle one real message at a time */ 546. 	}  547.      }  548.  }  549.   550.  void 551. readmail(otmp) 552. struct obj *otmp; 553. {  554.  #  ifdef SHELL	/* can't access mail reader without spawning subprocess */ 555.     const char *txt, *cmd; 556.     char *p, buf[BUFSZ], qbuf[BUFSZ]; 557.     int len; 558.  559.      /* there should be a command hidden beyond the object name */ 560.     txt = otmp->onamelth ? ONAME(otmp) : ""; 561.     len = strlen(txt); 562.     cmd = (len + 1 < otmp->onamelth) ? txt + len + 1 : (char *) 0; 563.     if (!cmd || !*cmd) cmd = "SPAWN"; 564.  565.      Sprintf(qbuf, "System command (%s)", cmd); 566.     getlin(qbuf, buf); 567.     if (*buf != '\033') { 568. 	for (p = eos(buf); p > buf; *p = '\0') 569. 	    if (*--p != ' ') break;	/* strip trailing spaces */ 570. 	if (*buf) cmd = buf;		/* use user entered command */ 571. 	if (!strcmpi(cmd, "SPAWN") || !strcmp(cmd, "!")) 572. 	    cmd = (char *) 0;		/* interactive escape */ 573.  574.  	vms_doshell(cmd, TRUE); 575. 	(void) sleep(1); 576.     }  577.  #  endif /* SHELL */ 578. }  579.   580.  # endif /* VMS */ 581.  582.  # ifdef LAN_MAIL 583.  584.  void 585. ckmailstatus 586. {  587.  	static int laststattime = 0; 588. 	  589.  	if(u.uswallow || !flags.biff  590.  #  ifdef MAILCKFREQ  591.  		    || moves < laststattime + MAILCKFREQ  592.  #  endif  593.  							) 594. 		return; 595.  596.  	laststattime = moves; 597. 	if (lan_mail_check) { 598. 		    static struct mail_info deliver = { 599. #  ifndef NO_MAILREADER 600. 			MSG_MAIL, "I have some mail for you", 601. #  else 602. 			/* suppress creation and delivery of scroll of mail */ 603. 			MSG_OTHER, "You have some mail in the outside world", 604. #  endif 605. 			0, 0  606.  		    };  607.  		    newmail(&deliver); 608. 	}  609.  }  610.   611.  /*ARGSUSED*/ 612. void 613. readmail(otmp) 614. struct obj *otmp; 615. {  616.  	lan_mail_read(otmp); 617. }  618.   619.  # endif /* LAN_MAIL */ 620.  621.  #endif /* OVL0 */ 622.  623.  #endif /* MAIL */ 624.  625.  /*mail.c*/