games/hack/hack.fix

   1 $NetBSD: hack.fix,v 1.3 2001/09/16 16:34:25 wiz Exp $
   2
   3 /***** unido:net.games.hack / ab /  7:23 pm  Sep 13, 1985*/
   4
   5 Recently hack (1.0.3) crashed with core dumps during some good games.
   6 The crashes occurred in the onbill-routine. After investigating the core
   7 dump I found that the shopkeeper's bill was still to be paid.  Normaly
   8 if you leave a shop the bill will be cleared and onbill() would not
   9 check it. But under certain conditions you can leave a shop without
  10 clearing the bill. The conditions are:
  11
  12      1. You have to rob a shop in order to make the shopkeeper
  13         follow you.
  14
  15      2. After leaving the shop being followed by the shopkeeper
  16         you must return to the shop...
  17
  18      3. ...and then leave the unguarded shop again.
  19         - The shopkeeper mustn't be present!
  20
  21 If you climb the stairs to the previous level, chances are that your
  22 bill now contains much more items than allowed. If so the next call to
  23 onbill() will dump the core.
  24
  25 Following is a context diff to fix the bug. Actually just the last hunk
  26 does the fix [it deletes two lines which have been inserted in 1.0.3],
  27 but I think the other fix was intended by the now deleted lines.
  28
  29         Andreas
  30
  31 --
  32 Andreas Bormann                 ab@unido.UUCP
  33 University of Dortmund          N 51 29' 05"   E 07 24' 42"
  34 West Germany
  35
  36 ------ the diff follows:
  37
  38 *** hack.shk.c.orig     Sun Aug  4 12:07:51 1985
  39 --- hack.shk.c  Fri Sep 13 14:29:52 1985
  40 ***************
  41 *** 133,139
  42         /* Did we just leave a shop? */
  43         if(u.uinshop &&
  44             (u.uinshop != roomno + 1 || shlevel != dlevel || !shopkeeper)) {
  45 -               u.uinshop = 0;
  46                 if(shopkeeper) {
  47                     if(ESHK(shopkeeper)->billct) {
  48                         pline("Somehow you escaped the shop without paying!");
  49
  50 --- 133,138 -----
  51         /* Did we just leave a shop? */
  52         if(u.uinshop &&
  53             (u.uinshop != roomno + 1 || shlevel != dlevel || !shopkeeper)) {
  54                 if(shopkeeper) {
  55                     if(ESHK(shopkeeper)->billct) {
  56                         if(inroom(shopkeeper->mx, shopkeeper->my)
  57 ***************
  58 *** 136,142
  59                 u.uinshop = 0;
  60                 if(shopkeeper) {
  61                     if(ESHK(shopkeeper)->billct) {
  62 !                       pline("Somehow you escaped the shop without paying!");
  63                         addupbill();
  64                         pline("You stole for a total worth of %ld zorkmids.",
  65                                 total);
  66
  67 --- 135,143 -----
  68             (u.uinshop != roomno + 1 || shlevel != dlevel || !shopkeeper)) {
  69                 if(shopkeeper) {
  70                     if(ESHK(shopkeeper)->billct) {
  71 !                       if(inroom(shopkeeper->mx, shopkeeper->my)
  72 !                           == u.uinshop - 1)   /* ab@unido */
  73 !                           pline("Somehow you escaped the shop without paying!");
  74                         addupbill();
  75                         pline("You stole for a total worth of %ld zorkmids.",
  76                                 total);
  77 ***************
  78 *** 149,154
  79                     shopkeeper = 0;
  80                     shlevel = 0;
  81                 }
  82         }
  83
  84         /* Did we just enter a zoo of some kind? */
  85
  86 --- 150,156 -----
  87                     shopkeeper = 0;
  88                     shlevel = 0;
  89                 }
  90 +               u.uinshop = 0;
  91         }
  92
  93         /* Did we just enter a zoo of some kind? */
  94 ***************
  95 *** 183,190
  96                 findshk(roomno);
  97             if(!shopkeeper) {
  98                 rooms[roomno].rtype = 0;
  99 -               u.uinshop = 0;
 100 -           } else if(inroom(shopkeeper->mx, shopkeeper->my) != roomno) {
 101                 u.uinshop = 0;
 102             } else if(!u.uinshop){
 103                 if(!ESHK(shopkeeper)->visitct ||
 104
 105 --- 185,190 -----
 106                 findshk(roomno);
 107             if(!shopkeeper) {
 108                 rooms[roomno].rtype = 0;
 109                 u.uinshop = 0;
 110             } else if(!u.uinshop){
 111                 if(!ESHK(shopkeeper)->visitct ||
 112 /* ---------- */
 113
 114
 115