Question simple_list forced to reset itself

(gdb) bt #0 0x00504402 in __kernel_vsyscall () #1 0x002e1b10 in raise () from /lib/libc.so.6 #2 0x002e3421 in abort () from /lib/libc.so.6 #3 0x0816b4d6 in core_dump_real (who=0x81b77f2 "lists.c", line=264) at utils.c:833 #4 0x0810916c in simple_list (pList=0xb446f68) at lists.c:264 #5 0x080e56d7 in perform_violence () at fight.c:1231 #6 0x080b54c5 in heartbeat (heart_pulse=56080) at comm.c:996 #7 0x080b8178 in game_loop (local_mother_desc=3) at comm.c:941 #8 0x080b9d37 in init_game (argc=Cannot access memory at address 0x391b ) at comm.c:536 #9 main (argc=Cannot access memory at address 0x391b ) at comm.c:356 /* control the fights going on. Called every 2 seconds from comm.c. */ void perform_violence(void) { struct char_data *ch, *tch; for (ch = combat_list; ch; ch = next_combat_list) { next_combat_list = ch->next_fighting; if (FIGHTING(ch) == NULL || IN_ROOM(ch) != IN_ROOM(FIGHTING(ch))) { stop_fighting(ch); continue; } if (IS_NPC(ch)) { if (GET_MOB_WAIT(ch) > 0) { GET_MOB_WAIT(ch) -= PULSE_VIOLENCE; continue; } GET_MOB_WAIT(ch) = 0; if (GET_POS(ch) < POS_FIGHTING) { GET_POS(ch) = POS_FIGHTING; act("$n scrambles to $s feet!", TRUE, ch, 0, 0, TO_ROOM); } if ((GET_HIT(FIGHTING(ch)) <= 12) && (MOB_FLAGGED(ch, MOB_MERCY))) { stop_fighting(FIGHTING(ch)); stop_fighting(ch); act("$n says: Blessed are the merciful, for they shall obtain mercy!", FALSE, ch, 0, 0, TO_ROOM); } // re-wield weapon lost to SKILL_DISARM if (LOST_WEAPON(ch)) { if (DISARM_WAIT(ch) > 0) { DISARM_WAIT(ch) -= PULSE_VIOLENCE; } else { do_wield(ch, OBJN(LOST_WEAPON(ch), ch), 0, 0); LOST_WEAPON(ch) = NULL; } } } if (GET_POS(ch) < POS_FIGHTING) { send_to_char(ch, "You can't fight while sitting!!\r\n"); continue; } if (GET_MOVE(ch) <= 0) continue; if (GROUP(ch)) { while ((tch = (struct char_data *) simple_list(GROUP(ch)->members)) != NULL) { <<<---Line 1231 if (tch == ch) continue; if (!IS_NPC(tch) && !PRF_FLAGGED(tch, PRF_AUTOASSIST)) continue; if (IN_ROOM(ch) != IN_ROOM(tch)) continue; if (FIGHTING(tch)) continue; if (GET_POS(tch) != POS_STANDING) continue; if (!CAN_SEE(tch, ch)) continue; do_assist(tch, GET_NAME(ch), 0, 0); } } { hit(ch, FIGHTING(ch), TYPE_UNDEFINED); GET_MOVE(ch) -= 1; }

- if (GROUP(ch)) { - while ((tch = (struct char_data *) simple_list(GROUP(ch)->members)) != NULL) { + if (GROUP(ch) && GROUP(ch)->members && GROUP(ch)->members->iSize) { + struct iterator_data Iterator; + + tch = (struct char_data *) merge_iterator(&Iterator, GROUP(ch)->members); + for (; tch ; tch = next_in_list(&Iterator)) { if (tch == ch) continue; if (!IS_NPC(tch) && !PRF_FLAGGED(tch, PRF_AUTOASSIST)) continue; if (IN_ROOM(ch) != IN_ROOM(tch)) continue; if (FIGHTING(tch)) continue; if (GET_POS(tch) != POS_STANDING) continue; if (!CAN_SEE(tch, ch)) continue; do_assist(tch, GET_NAME(ch), 0, 0); } + remove_iterator(&Iterator); }

/* OS compatibility */ #ifndef NULL /** Just in case NULL is not defined. */ #define NULL (void *)0 #endif