Crash with set_fighting

From: John Evans (evansj@HI-LINE.NET)
Date: 01/31/98 

I am having a most interesting time with set_fighting. For some reason, it
likes to crash my MUD without (from what I can tell) rhyme or reason.

Here is the gdb output (I saved the core and binary, so if you need a
specific print or somesuch, let me know and I will provide.)

Core was generated by `bin/spear -q 1066'.
Program terminated with signal 6, IOT trap/Abort.
Reading symbols from /lib/libc.so.5...done.
Reading symbols from /lib/ld-linux.so.1...done.
#0  0x40077f61 in __kill ()
(gdb) bt
#0  0x40077f61 in __kill ()
#1  0x4004407d in gsignal ()
#2  0x8083e86 in mag_masses (level=60, ch=0x813fba8, spellnum=71,
    savetype=4, argument=0x80e3b60 "cast") at magic.c:970
#3  0x809bdc1 in call_magic (caster=0x813fba8, cvict=0x0, ovict=0x0,
    spellnum=71, level=60, casttype=0, argument=0x80e3b60 "cast")
    at spell_parser.c:554
#4  0x809cb04 in cast_spell (ch=0x813fba8, tch=0x0, tobj=0x0, spellnum=71,
    argument=0x80e3b60 "cast") at spell_parser.c:821
#5  0x809d0c3 in do_cast (ch=0x813fba8, argument=0xbffff9f8 " ", cmd=51,
    subcmd=0) at spell_parser.c:991
#6  0x807e4f1 in command_interpreter (ch=0x813fba8,
    argument=0xbffff9f4 "cast ") at interpreter.c:914
#7  0x806b350 in game_loop (mother_desc=3) at comm.c:535
#8  0x806aa9c in init_game (port=1066) at comm.c:210
#9  0x806aa2b in main (argc=3, argv=0xbffffe58) at comm.c:182
#10 0x80493fe in _start ()


And, of course, here is the code that is giving me fits. This bit is
pulled from mag_masses() in magic.c.
  for (tch = world[ch->in_room].people; tch; tch = tch_next) {
    tch_next = tch->next_in_room;
    if (tch == ch)
      continue;

    if (spell_info[spellnum].violent) {
      if (!IS_NPC(ch) && !IS_NPC(tch) &&
          !PRF_FLAGGED(ch, PRF_CAN_MURDER)) {
        act("Your spell doesn't seem to affect $N",
            FALSE, ch, 0, tch, TO_CHAR);
        act("$n's spell doesn't seem to affect $N.",
            FALSE, ch, 0, tch, TO_NOTVICT);
        act("$n's spell doesn't seem to affect you.",
            FALSE, ch, 0, tch, TO_VICT);
        continue;
      }
      check_killer(ch, tch);
      if (!FIGHTING(tch))
        set_fighting(ch, tch);  /* THIS IS LINE 970 */
    }

   /* more stuff in loop here to actually make the spell do something */
  }

If I comment out the set_fighting (and the if), then all goes well, but I
want the target character to start bashing on the caster and without those
lines, it goes kaput. :(

I checked my set_fighting vs. stock set_fighting code and they are
identical exept for the fact that I renamed the IS_AFFECTED macro to
AFF_FLAGGED to be more consitent with the rest of the macros.

Any ideas?

Thanks in advance for any advice or suggestions that you may have.

John Evans <evansj@hi-line.net>  --  http://www.hi-line.net/~evansj/

Any sufficiently advanced technology is indistinguishable from magic.
--Arthur C. Clarke


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