gamelog.cpp

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "saveload/saveload.h"
00014 #include "string_func.h"
00015 #include "settings_type.h"
00016 #include "gamelog_internal.h"
00017 #include "console_func.h"
00018 #include "debug.h"
00019 #include "date_func.h"
00020 #include "rev.h"
00021 
00022 #include <stdarg.h>
00023 
00024 extern const uint16 SAVEGAME_VERSION;  
00025 
00026 extern SavegameType _savegame_type; 
00027 
00028 extern uint32 _ttdp_version;     
00029 extern uint16 _sl_version;       
00030 extern byte   _sl_minor_version; 
00031 
00032 
00033 static GamelogActionType _gamelog_action_type = GLAT_NONE; 
00034 
00035 LoggedAction *_gamelog_action = NULL;        
00036 uint _gamelog_actions         = 0;           
00037 static LoggedAction *_current_action = NULL; 
00038 
00039 
00045 void GamelogStartAction(GamelogActionType at)
00046 {
00047   assert(_gamelog_action_type == GLAT_NONE); // do not allow starting new action without stopping the previous first
00048   _gamelog_action_type = at;
00049 }
00050 
00054 void GamelogStopAction()
00055 {
00056   assert(_gamelog_action_type != GLAT_NONE); // nobody should try to stop if there is no action in progress
00057 
00058   bool print = _current_action != NULL;
00059 
00060   _current_action = NULL;
00061   _gamelog_action_type = GLAT_NONE;
00062 
00063   if (print) GamelogPrintDebug(5);
00064 }
00065 
00069 void GamelogReset()
00070 {
00071   assert(_gamelog_action_type == GLAT_NONE);
00072 
00073   for (uint i = 0; i < _gamelog_actions; i++) {
00074     const LoggedAction *la = &_gamelog_action[i];
00075     for (uint j = 0; j < la->changes; j++) {
00076       const LoggedChange *lc = &la->change[j];
00077       if (lc->ct == GLCT_SETTING) free(lc->setting.name);
00078     }
00079     free(la->change);
00080   }
00081 
00082   free(_gamelog_action);
00083 
00084   _gamelog_action  = NULL;
00085   _gamelog_actions = 0;
00086   _current_action  = NULL;
00087 }
00088 
00089 static const uint GAMELOG_BUF_LEN = 1024; 
00090 
00091 static uint _dbgofs = 0; 
00092 
00093 static void AddDebugText(char *buf, const char *s, ...) WARN_FORMAT(2, 3);
00094 
00095 static void AddDebugText(char *buf, const char *s, ...)
00096 {
00097   if (GAMELOG_BUF_LEN <= _dbgofs) return;
00098 
00099   va_list va;
00100 
00101   va_start(va, s);
00102   _dbgofs += vsnprintf(buf + _dbgofs, GAMELOG_BUF_LEN - _dbgofs, s, va);
00103   va_end(va);
00104 }
00105 
00106 
00114 static void PrintGrfInfo(char *buf, uint grfid, const uint8 *md5sum, const GRFConfig *gc)
00115 {
00116   char txt[40];
00117 
00118   if (md5sum != NULL) {
00119     md5sumToString(txt, lastof(txt), md5sum);
00120     AddDebugText(buf, "GRF ID %08X, checksum %s", BSWAP32(grfid), txt);
00121   } else {
00122     AddDebugText(buf, "GRF ID %08X", BSWAP32(grfid));
00123   }
00124 
00125   if (gc != NULL) {
00126     AddDebugText(buf, ", filename: %s (md5sum matches)", gc->filename);
00127   } else {
00128     gc = FindGRFConfig(grfid, FGCM_ANY);
00129     if (gc != NULL) {
00130       AddDebugText(buf, ", filename: %s (matches GRFID only)", gc->filename);
00131     } else {
00132       AddDebugText(buf, ", unknown GRF");
00133     }
00134   }
00135   return;
00136 }
00137 
00138 
00140 static const char * const la_text[] = {
00141   "new game started",
00142   "game loaded",
00143   "GRF config changed",
00144   "cheat was used",
00145   "settings changed",
00146   "GRF bug triggered",
00147   "emergency savegame",
00148 };
00149 
00150 assert_compile(lengthof(la_text) == GLAT_END);
00151 
00159 struct GRFPresence{
00160   const GRFConfig *gc;  
00161   bool was_missing;     
00162 
00163   GRFPresence(const GRFConfig *gc) : gc(gc), was_missing(false) {}
00164 };
00165 typedef SmallMap<uint32, GRFPresence> GrfIDMapping;
00166 
00171 void GamelogPrint(GamelogPrintProc *proc)
00172 {
00173   char buf[GAMELOG_BUF_LEN];
00174   GrfIDMapping grf_names;
00175 
00176   proc("---- gamelog start ----");
00177 
00178   const LoggedAction *laend = &_gamelog_action[_gamelog_actions];
00179 
00180   for (const LoggedAction *la = _gamelog_action; la != laend; la++) {
00181     assert((uint)la->at < GLAT_END);
00182 
00183     snprintf(buf, GAMELOG_BUF_LEN, "Tick %u: %s", (uint)la->tick, la_text[(uint)la->at]);
00184     proc(buf);
00185 
00186     const LoggedChange *lcend = &la->change[la->changes];
00187 
00188     for (const LoggedChange *lc = la->change; lc != lcend; lc++) {
00189       _dbgofs = 0;
00190       AddDebugText(buf, "     ");
00191 
00192       switch (lc->ct) {
00193         default: NOT_REACHED();
00194         case GLCT_MODE:
00195           AddDebugText(buf, "New game mode: %u landscape: %u",
00196             (uint)lc->mode.mode, (uint)lc->mode.landscape);
00197           break;
00198 
00199         case GLCT_REVISION:
00200           AddDebugText(buf, "Revision text changed to %s, savegame version %u, ",
00201             lc->revision.text, lc->revision.slver);
00202 
00203           switch (lc->revision.modified) {
00204             case 0: AddDebugText(buf, "not "); break;
00205             case 1: AddDebugText(buf, "maybe "); break;
00206             default: break;
00207           }
00208 
00209           AddDebugText(buf, "modified, _openttd_newgrf_version = 0x%08x", lc->revision.newgrf);
00210           break;
00211 
00212         case GLCT_OLDVER:
00213           AddDebugText(buf, "Conversion from ");
00214           switch (lc->oldver.type) {
00215             default: NOT_REACHED();
00216             case SGT_OTTD:
00217               AddDebugText(buf, "OTTD savegame without gamelog: version %u, %u",
00218                 GB(lc->oldver.version, 8, 16), GB(lc->oldver.version, 0, 8));
00219               break;
00220 
00221             case SGT_TTO:
00222               AddDebugText(buf, "TTO savegame");
00223               break;
00224 
00225             case SGT_TTD:
00226               AddDebugText(buf, "TTD savegame");
00227               break;
00228 
00229             case SGT_TTDP1:
00230             case SGT_TTDP2:
00231               AddDebugText(buf, "TTDP savegame, %s format",
00232                 lc->oldver.type == SGT_TTDP1 ? "old" : "new");
00233               if (lc->oldver.version != 0) {
00234                 AddDebugText(buf, ", TTDP version %u.%u.%u.%u",
00235                   GB(lc->oldver.version, 24, 8), GB(lc->oldver.version, 20, 4),
00236                   GB(lc->oldver.version, 16, 4), GB(lc->oldver.version, 0, 16));
00237               }
00238               break;
00239           }
00240           break;
00241 
00242         case GLCT_SETTING:
00243           AddDebugText(buf, "Setting changed: %s : %d -> %d", lc->setting.name, lc->setting.oldval, lc->setting.newval);
00244           break;
00245 
00246         case GLCT_GRFADD: {
00247           const GRFConfig *gc = FindGRFConfig(lc->grfadd.grfid, FGCM_EXACT, lc->grfadd.md5sum);
00248           AddDebugText(buf, "Added NewGRF: ");
00249           PrintGrfInfo(buf, lc->grfadd.grfid, lc->grfadd.md5sum, gc);
00250           GrfIDMapping::Pair *gm = grf_names.Find(lc->grfrem.grfid);
00251           if (gm != grf_names.End() && !gm->second.was_missing) AddDebugText(buf, ". Gamelog inconsistency: GrfID was already added!");
00252           grf_names[lc->grfadd.grfid] = gc;
00253           break;
00254         }
00255 
00256         case GLCT_GRFREM: {
00257           GrfIDMapping::Pair *gm = grf_names.Find(lc->grfrem.grfid);
00258           AddDebugText(buf, la->at == GLAT_LOAD ? "Missing NewGRF: " : "Removed NewGRF: ");
00259           PrintGrfInfo(buf, lc->grfrem.grfid, NULL, gm != grf_names.End() ? gm->second.gc : NULL);
00260           if (gm == grf_names.End()) {
00261             AddDebugText(buf, ". Gamelog inconsistency: GrfID was never added!");
00262           } else {
00263             if (la->at == GLAT_LOAD) {
00264               /* Missing grfs on load are not removed from the configuration */
00265               gm->second.was_missing = true;
00266             } else {
00267               grf_names.Erase(gm);
00268             }
00269           }
00270           break;
00271         }
00272 
00273         case GLCT_GRFCOMPAT: {
00274           const GRFConfig *gc = FindGRFConfig(lc->grfadd.grfid, FGCM_EXACT, lc->grfadd.md5sum);
00275           AddDebugText(buf, "Compatible NewGRF loaded: ");
00276           PrintGrfInfo(buf, lc->grfcompat.grfid, lc->grfcompat.md5sum, gc);
00277           if (!grf_names.Contains(lc->grfcompat.grfid)) AddDebugText(buf, ". Gamelog inconsistency: GrfID was never added!");
00278           grf_names[lc->grfcompat.grfid] = gc;
00279           break;
00280         }
00281 
00282         case GLCT_GRFPARAM: {
00283           GrfIDMapping::Pair *gm = grf_names.Find(lc->grfrem.grfid);
00284           AddDebugText(buf, "GRF parameter changed: ");
00285           PrintGrfInfo(buf, lc->grfparam.grfid, NULL, gm != grf_names.End() ? gm->second.gc : NULL);
00286           if (gm == grf_names.End()) AddDebugText(buf, ". Gamelog inconsistency: GrfID was never added!");
00287           break;
00288         }
00289 
00290         case GLCT_GRFMOVE: {
00291           GrfIDMapping::Pair *gm = grf_names.Find(lc->grfrem.grfid);
00292           AddDebugText(buf, "GRF order changed: %08X moved %d places %s",
00293             BSWAP32(lc->grfmove.grfid), abs(lc->grfmove.offset), lc->grfmove.offset >= 0 ? "down" : "up" );
00294           PrintGrfInfo(buf, lc->grfmove.grfid, NULL, gm != grf_names.End() ? gm->second.gc : NULL);
00295           if (gm == grf_names.End()) AddDebugText(buf, ". Gamelog inconsistency: GrfID was never added!");
00296           break;
00297         }
00298 
00299         case GLCT_GRFBUG: {
00300           GrfIDMapping::Pair *gm = grf_names.Find(lc->grfrem.grfid);
00301           switch (lc->grfbug.bug) {
00302             default: NOT_REACHED();
00303             case GBUG_VEH_LENGTH:
00304               AddDebugText(buf, "Rail vehicle changes length outside a depot: GRF ID %08X, internal ID 0x%X", BSWAP32(lc->grfbug.grfid), (uint)lc->grfbug.data);
00305               break;
00306           }
00307           PrintGrfInfo(buf, lc->grfbug.grfid, NULL, gm != grf_names.End() ? gm->second.gc : NULL);
00308           if (gm == grf_names.End()) AddDebugText(buf, ". Gamelog inconsistency: GrfID was never added!");
00309           break;
00310         }
00311 
00312         case GLCT_EMERGENCY:
00313           break;
00314       }
00315 
00316       proc(buf);
00317     }
00318   }
00319 
00320   proc("---- gamelog end ----");
00321 }
00322 
00323 
00324 static void GamelogPrintConsoleProc(const char *s)
00325 {
00326   IConsolePrint(CC_WARNING, s);
00327 }
00328 
00329 void GamelogPrintConsole()
00330 {
00331   GamelogPrint(&GamelogPrintConsoleProc);
00332 }
00333 
00334 static int _gamelog_print_level = 0; 
00335 
00336 static void GamelogPrintDebugProc(const char *s)
00337 {
00338   DEBUG(gamelog, _gamelog_print_level, "%s", s);
00339 }
00340 
00341 
00348 void GamelogPrintDebug(int level)
00349 {
00350   _gamelog_print_level = level;
00351   GamelogPrint(&GamelogPrintDebugProc);
00352 }
00353 
00354 
00361 static LoggedChange *GamelogChange(GamelogChangeType ct)
00362 {
00363   if (_current_action == NULL) {
00364     if (_gamelog_action_type == GLAT_NONE) return NULL;
00365 
00366     _gamelog_action  = ReallocT(_gamelog_action, _gamelog_actions + 1);
00367     _current_action  = &_gamelog_action[_gamelog_actions++];
00368 
00369     _current_action->at      = _gamelog_action_type;
00370     _current_action->tick    = _tick_counter;
00371     _current_action->change  = NULL;
00372     _current_action->changes = 0;
00373   }
00374 
00375   _current_action->change = ReallocT(_current_action->change, _current_action->changes + 1);
00376 
00377   LoggedChange *lc = &_current_action->change[_current_action->changes++];
00378   lc->ct = ct;
00379 
00380   return lc;
00381 }
00382 
00383 
00387 void GamelogEmergency()
00388 {
00389   /* Terminate any active action */
00390   if (_gamelog_action_type != GLAT_NONE) GamelogStopAction();
00391   GamelogStartAction(GLAT_EMERGENCY);
00392   GamelogChange(GLCT_EMERGENCY);
00393   GamelogStopAction();
00394 }
00395 
00399 bool GamelogTestEmergency()
00400 {
00401   const LoggedChange *emergency = NULL;
00402 
00403   const LoggedAction *laend = &_gamelog_action[_gamelog_actions];
00404   for (const LoggedAction *la = _gamelog_action; la != laend; la++) {
00405     const LoggedChange *lcend = &la->change[la->changes];
00406     for (const LoggedChange *lc = la->change; lc != lcend; lc++) {
00407       if (lc->ct == GLCT_EMERGENCY) emergency = lc;
00408     }
00409   }
00410 
00411   return (emergency != NULL);
00412 }
00413 
00417 void GamelogRevision()
00418 {
00419   assert(_gamelog_action_type == GLAT_START || _gamelog_action_type == GLAT_LOAD);
00420 
00421   LoggedChange *lc = GamelogChange(GLCT_REVISION);
00422   if (lc == NULL) return;
00423 
00424   memset(lc->revision.text, 0, sizeof(lc->revision.text));
00425   strecpy(lc->revision.text, _openttd_revision, lastof(lc->revision.text));
00426   lc->revision.slver = SAVEGAME_VERSION;
00427   lc->revision.modified = _openttd_revision_modified;
00428   lc->revision.newgrf = _openttd_newgrf_version;
00429 }
00430 
00434 void GamelogMode()
00435 {
00436   assert(_gamelog_action_type == GLAT_START || _gamelog_action_type == GLAT_LOAD || _gamelog_action_type == GLAT_CHEAT);
00437 
00438   LoggedChange *lc = GamelogChange(GLCT_MODE);
00439   if (lc == NULL) return;
00440 
00441   lc->mode.mode      = _game_mode;
00442   lc->mode.landscape = _settings_game.game_creation.landscape;
00443 }
00444 
00448 void GamelogOldver()
00449 {
00450   assert(_gamelog_action_type == GLAT_LOAD);
00451 
00452   LoggedChange *lc = GamelogChange(GLCT_OLDVER);
00453   if (lc == NULL) return;
00454 
00455   lc->oldver.type = _savegame_type;
00456   lc->oldver.version = (_savegame_type == SGT_OTTD ? ((uint32)_sl_version << 8 | _sl_minor_version) : _ttdp_version);
00457 }
00458 
00465 void GamelogSetting(const char *name, int32 oldval, int32 newval)
00466 {
00467   assert(_gamelog_action_type == GLAT_SETTING);
00468 
00469   LoggedChange *lc = GamelogChange(GLCT_SETTING);
00470   if (lc == NULL) return;
00471 
00472   lc->setting.name = strdup(name);
00473   lc->setting.oldval = oldval;
00474   lc->setting.newval = newval;
00475 }
00476 
00477 
00482 void GamelogTestRevision()
00483 {
00484   const LoggedChange *rev = NULL;
00485 
00486   const LoggedAction *laend = &_gamelog_action[_gamelog_actions];
00487   for (const LoggedAction *la = _gamelog_action; la != laend; la++) {
00488     const LoggedChange *lcend = &la->change[la->changes];
00489     for (const LoggedChange *lc = la->change; lc != lcend; lc++) {
00490       if (lc->ct == GLCT_REVISION) rev = lc;
00491     }
00492   }
00493 
00494   if (rev == NULL || strcmp(rev->revision.text, _openttd_revision) != 0 ||
00495       rev->revision.modified != _openttd_revision_modified ||
00496       rev->revision.newgrf != _openttd_newgrf_version) {
00497     GamelogRevision();
00498   }
00499 }
00500 
00505 void GamelogTestMode()
00506 {
00507   const LoggedChange *mode = NULL;
00508 
00509   const LoggedAction *laend = &_gamelog_action[_gamelog_actions];
00510   for (const LoggedAction *la = _gamelog_action; la != laend; la++) {
00511     const LoggedChange *lcend = &la->change[la->changes];
00512     for (const LoggedChange *lc = la->change; lc != lcend; lc++) {
00513       if (lc->ct == GLCT_MODE) mode = lc;
00514     }
00515   }
00516 
00517   if (mode == NULL || mode->mode.mode != _game_mode || mode->mode.landscape != _settings_game.game_creation.landscape) GamelogMode();
00518 }
00519 
00520 
00527 static void GamelogGRFBug(uint32 grfid, byte bug, uint64 data)
00528 {
00529   assert(_gamelog_action_type == GLAT_GRFBUG);
00530 
00531   LoggedChange *lc = GamelogChange(GLCT_GRFBUG);
00532   if (lc == NULL) return;
00533 
00534   lc->grfbug.data  = data;
00535   lc->grfbug.grfid = grfid;
00536   lc->grfbug.bug   = bug;
00537 }
00538 
00548 bool GamelogGRFBugReverse(uint32 grfid, uint16 internal_id)
00549 {
00550   const LoggedAction *laend = &_gamelog_action[_gamelog_actions];
00551   for (const LoggedAction *la = _gamelog_action; la != laend; la++) {
00552     const LoggedChange *lcend = &la->change[la->changes];
00553     for (const LoggedChange *lc = la->change; lc != lcend; lc++) {
00554       if (lc->ct == GLCT_GRFBUG && lc->grfbug.grfid == grfid &&
00555           lc->grfbug.bug == GBUG_VEH_LENGTH && lc->grfbug.data == internal_id) {
00556         return false;
00557       }
00558     }
00559   }
00560 
00561   GamelogStartAction(GLAT_GRFBUG);
00562   GamelogGRFBug(grfid, GBUG_VEH_LENGTH, internal_id);
00563   GamelogStopAction();
00564 
00565   return true;
00566 }
00567 
00568 
00574 static inline bool IsLoggableGrfConfig(const GRFConfig *g)
00575 {
00576   return !HasBit(g->flags, GCF_STATIC) && g->status != GCS_NOT_FOUND;
00577 }
00578 
00583 void GamelogGRFRemove(uint32 grfid)
00584 {
00585   assert(_gamelog_action_type == GLAT_LOAD || _gamelog_action_type == GLAT_GRF);
00586 
00587   LoggedChange *lc = GamelogChange(GLCT_GRFREM);
00588   if (lc == NULL) return;
00589 
00590   lc->grfrem.grfid = grfid;
00591 }
00592 
00597 void GamelogGRFAdd(const GRFConfig *newg)
00598 {
00599   assert(_gamelog_action_type == GLAT_LOAD || _gamelog_action_type == GLAT_START || _gamelog_action_type == GLAT_GRF);
00600 
00601   if (!IsLoggableGrfConfig(newg)) return;
00602 
00603   LoggedChange *lc = GamelogChange(GLCT_GRFADD);
00604   if (lc == NULL) return;
00605 
00606   lc->grfadd = newg->ident;
00607 }
00608 
00614 void GamelogGRFCompatible(const GRFIdentifier *newg)
00615 {
00616   assert(_gamelog_action_type == GLAT_LOAD || _gamelog_action_type == GLAT_GRF);
00617 
00618   LoggedChange *lc = GamelogChange(GLCT_GRFCOMPAT);
00619   if (lc == NULL) return;
00620 
00621   lc->grfcompat = *newg;
00622 }
00623 
00629 static void GamelogGRFMove(uint32 grfid, int32 offset)
00630 {
00631   assert(_gamelog_action_type == GLAT_GRF);
00632 
00633   LoggedChange *lc = GamelogChange(GLCT_GRFMOVE);
00634   if (lc == NULL) return;
00635 
00636   lc->grfmove.grfid  = grfid;
00637   lc->grfmove.offset = offset;
00638 }
00639 
00645 static void GamelogGRFParameters(uint32 grfid)
00646 {
00647   assert(_gamelog_action_type == GLAT_GRF);
00648 
00649   LoggedChange *lc = GamelogChange(GLCT_GRFPARAM);
00650   if (lc == NULL) return;
00651 
00652   lc->grfparam.grfid = grfid;
00653 }
00654 
00660 void GamelogGRFAddList(const GRFConfig *newg)
00661 {
00662   assert(_gamelog_action_type == GLAT_START || _gamelog_action_type == GLAT_LOAD);
00663 
00664   for (; newg != NULL; newg = newg->next) {
00665     GamelogGRFAdd(newg);
00666   }
00667 }
00668 
00670 struct GRFList {
00671   uint n;
00672   const GRFConfig *grf[];
00673 };
00674 
00679 static GRFList *GenerateGRFList(const GRFConfig *grfc)
00680 {
00681   uint n = 0;
00682   for (const GRFConfig *g = grfc; g != NULL; g = g->next) {
00683     if (IsLoggableGrfConfig(g)) n++;
00684   }
00685 
00686   GRFList *list = (GRFList*)MallocT<byte>(sizeof(GRFList) + n * sizeof(GRFConfig*));
00687 
00688   list->n = 0;
00689   for (const GRFConfig *g = grfc; g != NULL; g = g->next) {
00690     if (IsLoggableGrfConfig(g)) list->grf[list->n++] = g;
00691   }
00692 
00693   return list;
00694 }
00695 
00701 void GamelogGRFUpdate(const GRFConfig *oldc, const GRFConfig *newc)
00702 {
00703   GRFList *ol = GenerateGRFList(oldc);
00704   GRFList *nl = GenerateGRFList(newc);
00705 
00706   uint o = 0, n = 0;
00707 
00708   while (o < ol->n && n < nl->n) {
00709     const GRFConfig *og = ol->grf[o];
00710     const GRFConfig *ng = nl->grf[n];
00711 
00712     if (og->ident.grfid != ng->ident.grfid) {
00713       uint oi, ni;
00714       for (oi = 0; oi < ol->n; oi++) {
00715         if (ol->grf[oi]->ident.grfid == nl->grf[n]->ident.grfid) break;
00716       }
00717       if (oi < o) {
00718         /* GRF was moved, this change has been logged already */
00719         n++;
00720         continue;
00721       }
00722       if (oi == ol->n) {
00723         /* GRF couldn't be found in the OLD list, GRF was ADDED */
00724         GamelogGRFAdd(nl->grf[n++]);
00725         continue;
00726       }
00727       for (ni = 0; ni < nl->n; ni++) {
00728         if (nl->grf[ni]->ident.grfid == ol->grf[o]->ident.grfid) break;
00729       }
00730       if (ni < n) {
00731         /* GRF was moved, this change has been logged already */
00732         o++;
00733         continue;
00734       }
00735       if (ni == nl->n) {
00736         /* GRF couldn't be found in the NEW list, GRF was REMOVED */
00737         GamelogGRFRemove(ol->grf[o++]->ident.grfid);
00738         continue;
00739       }
00740 
00741       /* o < oi < ol->n
00742        * n < ni < nl->n */
00743       assert(ni > n && ni < nl->n);
00744       assert(oi > o && oi < ol->n);
00745 
00746       ni -= n; // number of GRFs it was moved downwards
00747       oi -= o; // number of GRFs it was moved upwards
00748 
00749       if (ni >= oi) { // prefer the one that is moved further
00750         /* GRF was moved down */
00751         GamelogGRFMove(ol->grf[o++]->ident.grfid, ni);
00752       } else {
00753         GamelogGRFMove(nl->grf[n++]->ident.grfid, -(int)oi);
00754       }
00755     } else {
00756       if (memcmp(og->ident.md5sum, ng->ident.md5sum, sizeof(og->ident.md5sum)) != 0) {
00757         /* md5sum changed, probably loading 'compatible' GRF */
00758         GamelogGRFCompatible(&nl->grf[n]->ident);
00759       }
00760 
00761       if (og->num_params != ng->num_params || memcmp(og->param, ng->param, og->num_params * sizeof(og->param[0])) != 0) {
00762         GamelogGRFParameters(ol->grf[o]->ident.grfid);
00763       }
00764 
00765       o++;
00766       n++;
00767     }
00768   }
00769 
00770   while (o < ol->n) GamelogGRFRemove(ol->grf[o++]->ident.grfid); // remaining GRFs were removed ...
00771   while (n < nl->n) GamelogGRFAdd   (nl->grf[n++]);              // ... or added
00772 
00773   free(ol);
00774   free(nl);
00775 }

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