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script.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2005 The ScummVM project
 *
 * This program 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; either version 2
 * of the License, or (at your option) any later version.

 * This program 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.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/scumm/script.cpp,v 1.232.2.1 2005/10/18 02:11:21 sev Exp $
 *
 */

#include "common/stdafx.h"

#include "common/config-manager.h"
#include "common/util.h"

#include "scumm/actor.h"
#include "scumm/object.h"
#include "scumm/resource.h"
#include "scumm/util.h"
#include "scumm/scumm.h"
#include "scumm/verbs.h"

namespace Scumm {

/* Start executing script 'script' with the given parameters */
void ScummEngine::runScript(int script, bool freezeResistant, bool recursive, int *lvarptr, int cycle) {
      ScriptSlot *s;
      byte *scriptPtr;
      uint32 scriptOffs;
      byte scriptType;
      int slot;

      if (!script)
            return;

      if (!recursive)
            stopScript(script);

      if (script < _numGlobalScripts) {
            scriptPtr = getResourceAddress(rtScript, script);
            scriptOffs = _resourceHeaderSize;
            scriptType = WIO_GLOBAL;

            debugC(DEBUG_SCRIPTS, "runScript(Global-%d) from %d-%d", script,
                               vm.slot[_currentScript].number, _roomResource);
      } else {
            scriptOffs = _localScriptOffsets[script - _numGlobalScripts];
            if (scriptOffs == 0)
                  error("Local script %d is not in room %d", script, _roomResource);
            scriptType = WIO_LOCAL;

            debugC(DEBUG_SCRIPTS, "runScript(%d) from %d-%d", script,
                               vm.slot[_currentScript].number, _roomResource);
      }

      if (cycle == 0)
            cycle = (_heversion >= 90) ? VAR(VAR_SCRIPT_CYCLE) : 1;

      slot = getScriptSlot();

      s = &vm.slot[slot];
      s->number = script;
      s->offs = scriptOffs;
      s->status = ssRunning;
      s->where = scriptType;
      s->freezeResistant = freezeResistant;
      s->recursive = recursive;
      s->freezeCount = 0;
      s->delayFrameCount = 0;
      s->cycle = cycle;

      initializeLocals(slot, lvarptr);

      runScriptNested(slot);
}

void ScummEngine::runObjectScript(int object, int entry, bool freezeResistant, bool recursive, int *vars, int slot, int cycle) {
      ScriptSlot *s;
      uint32 obcd;
      int where, offs;

      if (!object)
            return;

      if (!recursive && (_version >= 3))
            stopObjectScript(object);

      where = whereIsObject(object);

      if (where == WIO_NOT_FOUND) {
            warning("Code for object %d not in room %d", object, _roomResource);
            return;
      }

      obcd = getOBCDOffs(object);

      // Find a free object slot, unless one was specified
      if (slot == -1)
            slot = getScriptSlot();

      offs = getVerbEntrypoint(object, entry);
      if (offs == 0)
            return;

      if (cycle == 0)
            cycle = (_heversion >= 90) ? VAR(VAR_SCRIPT_CYCLE) : 1;

      s = &vm.slot[slot];
      s->number = object;
      s->offs = obcd + offs;
      s->status = ssRunning;
      s->where = where;
      s->freezeResistant = freezeResistant;
      s->recursive = recursive;
      s->freezeCount = 0;
      s->delayFrameCount = 0;
      s->cycle = cycle;

      initializeLocals(slot, vars);

      runScriptNested(slot);
}

void ScummEngine::initializeLocals(int slot, int *vars) {
      int i;
      if (!vars) {
            for (i = 0; i < 25; i++)
                  vm.localvar[slot][i] = 0;
      } else {
            for (i = 0; i < 25; i++)
                  vm.localvar[slot][i] = vars[i];
      }
}

int ScummEngine::getVerbEntrypoint(int obj, int entry) {
      const byte *objptr, *verbptr;
      int verboffs;

      if (whereIsObject(obj) == WIO_NOT_FOUND)
            return 0;

      objptr = getOBCDFromObject(obj);
      assert(objptr);

      if (_platform == Common::kPlatformC64 && _gameId == GID_MANIAC)
            verbptr = objptr + 14;
      else if (_version <= 2)
            verbptr = objptr + 15;
      else if (_features & GF_OLD_BUNDLE)
            verbptr = objptr + 17;
      else if (_features & GF_SMALL_HEADER)
            verbptr = objptr + 19;
      else
            verbptr = findResource(MKID('VERB'), objptr);

      assert(verbptr);

      verboffs = verbptr - objptr;

      if (!(_features & GF_SMALL_HEADER))
            verbptr += _resourceHeaderSize;

      if (_version == 8) {
            const uint32 *ptr = (const uint32 *)verbptr;
            uint32 verb;
            do {
                  verb = READ_LE_UINT32(ptr);
                  if (!verb)
                        return 0;
                  if (verb == (uint32)entry || verb == 0xFFFFFFFF)
                        break;
                  ptr += 2;
            } while (1);
            return verboffs + 8 + READ_LE_UINT32(ptr + 1);
      } if (_version <= 2) {
            do {
                  if (!*verbptr)
                        return 0;
                  if (*verbptr == entry || *verbptr == 0xFF)
                        break;
                  verbptr += 2;
            } while (1);

            return *(verbptr + 1);
      } else {
            do {
                  if (!*verbptr)
                        return 0;
                  if (*verbptr == entry || *verbptr == 0xFF)
                        break;
                  verbptr += 3;
            } while (1);

            if (_features & GF_SMALL_HEADER)
                  return READ_LE_UINT16(verbptr + 1);
            else
                  return verboffs + READ_LE_UINT16(verbptr + 1);
      }
}

/* Stop script 'script' */
void ScummEngine::stopScript(int script) {
      ScriptSlot *ss;
      NestedScript *nest;
      int i, num;

      if (script == 0)
            return;

      ss = vm.slot;
      for (i = 0; i < NUM_SCRIPT_SLOT; i++, ss++) {
            if (script == ss->number && ss->status != ssDead &&
                  (ss->where == WIO_GLOBAL || ss->where == WIO_LOCAL)) {
                  if (ss->cutsceneOverride)
                        if (_version >= 5)
                              error("Script %d stopped with active cutscene/override", script);
                  ss->number = 0;
                  ss->status = ssDead;
                  nukeArrays(i);
                  if (_currentScript == i)
                        _currentScript = 0xFF;
            }
      }

      nest = vm.nest;
      num = vm.numNestedScripts;

      while (num > 0) {
            if (nest->number == script &&
                        (nest->where == WIO_GLOBAL || nest->where == WIO_LOCAL)) {
                  nukeArrays(nest->slot);
                  nest->number = 0xFF;
                  nest->slot = 0xFF;
                  nest->where = 0xFF;
            }
            nest++;
            num--;
      }
}

/* Stop an object script 'script'*/
void ScummEngine::stopObjectScript(int script) {
      ScriptSlot *ss;
      NestedScript *nest;
      int i, num;

      if (script == 0)
            return;

      ss = vm.slot;
      for (i = 0; i < NUM_SCRIPT_SLOT; i++, ss++) {
            if (script == ss->number && ss->status != ssDead &&
                (ss->where == WIO_ROOM || ss->where == WIO_INVENTORY || ss->where == WIO_FLOBJECT)) {
                  if (ss->cutsceneOverride)
                        if (_version >= 5)
                              error("Object %d stopped with active cutscene/override", script);
                  ss->number = 0;
                  ss->status = ssDead;
                  nukeArrays(i);
                  if (_currentScript == i)
                        _currentScript = 0xFF;
            }
      }

      nest = vm.nest;
      num = vm.numNestedScripts;

      while (num > 0) {
            if (nest->number == script &&
                        (nest->where == WIO_ROOM || nest->where == WIO_INVENTORY || nest->where == WIO_FLOBJECT)) {
                  nukeArrays(nest->slot);
                  nest->number = 0xFF;
                  nest->slot = 0xFF;
                  nest->where = 0xFF;
            }
            nest++;
            num--;
      }
}

/* Return a free script slot */
int ScummEngine::getScriptSlot() {
      ScriptSlot *s;
      int i;

      for (i = 1; i < NUM_SCRIPT_SLOT; i++) {
            s = &vm.slot[i];
            if (s->status == ssDead)
                  return i;
      }
      error("Too many scripts running, %d max", NUM_SCRIPT_SLOT);
      return -1;
}

/* Run script 'script' nested - eg, within the parent script.*/
void ScummEngine::runScriptNested(int script) {
      NestedScript *nest;
      ScriptSlot *slot;

      updateScriptPtr();

      nest = &vm.nest[vm.numNestedScripts];

      if (_currentScript == 0xFF) {
            nest->number = 0xFF;
            nest->where = 0xFF;
      } else {
            // Store information about the currently running script
            slot = &vm.slot[_currentScript];
            nest->number = slot->number;
            nest->where = slot->where;
            nest->slot = _currentScript;
      }

      vm.numNestedScripts++;

      if (vm.numNestedScripts > ARRAYSIZE(vm.nest))
            error("Too many nested scripts");

      _currentScript = script;
      getScriptBaseAddress();
      getScriptEntryPoint();
      executeScript();

      vm.numNestedScripts--;

      if (nest->number != 0xFF) {
            // Try to resume the script which called us, if its status has not changed
            // since it invoked us. In particular, we only resume it if it hasn't been
            // stopped in the meantime, and if it did not already move on.
            slot = &vm.slot[nest->slot];
            if (slot->number == nest->number && slot->where == nest->where &&
                        slot->status != ssDead && slot->freezeCount == 0) {
                  _currentScript = nest->slot;
                  getScriptBaseAddress();
                  getScriptEntryPoint();
                  return;
            }
      }
      _currentScript = 0xFF;
}

void ScummEngine::updateScriptPtr() {
      if (_currentScript == 0xFF)
            return;

      vm.slot[_currentScript].offs = _scriptPointer - _scriptOrgPointer;
}

/* Nuke arrays based on script */
void ScummEngine::nukeArrays(byte scriptSlot) {
      int i;

      if (_heversion == 0 || scriptSlot == 0)
            return;

      for (i = 1; i < _numArray; i++) {
            if (_arraySlot[i] == scriptSlot) {
                  res.nukeResource(rtString, i);
                  _arraySlot[i] = 0;
            }
      }
}

/* Get the code pointer to a script */
void ScummEngine::getScriptBaseAddress() {
      ScriptSlot *ss;
      int idx;

      if (_currentScript == 0xFF)
            return;

      ss = &vm.slot[_currentScript];
      switch (ss->where) {
      case WIO_INVENTORY:                             /* inventory script * */
            for (idx = 0; idx < _numInventory; idx++)
                  if (_inventory[idx] == ss->number)
                        break;
            _scriptOrgPointer = getResourceAddress(rtInventory, idx);
            assert(idx < _numInventory);
            _lastCodePtr = &res.address[rtInventory][idx];
            break;

      case WIO_LOCAL:
      case WIO_ROOM:                                              /* room script */
            if (_version == 8) {
                  _scriptOrgPointer = getResourceAddress(rtRoomScripts, _roomResource);
                  assert(_roomResource < res.num[rtRoomScripts]);
                  _lastCodePtr = &res.address[rtRoomScripts][_roomResource];
            } else {
                  _scriptOrgPointer = getResourceAddress(rtRoom, _roomResource);
                  assert(_roomResource < _numRooms);
                  _lastCodePtr = &res.address[rtRoom][_roomResource];
            }
            break;

      case WIO_GLOBAL:                                      /* global script */
            _scriptOrgPointer = getResourceAddress(rtScript, ss->number);
            assert(ss->number < _numScripts);
            _lastCodePtr = &res.address[rtScript][ss->number];
            break;

      case WIO_FLOBJECT:                                    /* flobject script */
            idx = getObjectIndex(ss->number);
            assert(idx != -1);
            idx = _objs[idx].fl_object_index;
            _scriptOrgPointer = getResourceAddress(rtFlObject, idx);
            assert(idx < _numFlObject);
            _lastCodePtr = &res.address[rtFlObject][idx];
            break;
      default:
            error("Bad type while getting base address");
      }

      // The following fixes bug #1202487. Confirmed against disasm.
      if (_version <= 2 && _scriptOrgPointer == NULL) {
            ss->status = ssDead;
            _currentScript = 0xFF;
      }
}


void ScummEngine::getScriptEntryPoint() {
      if (_currentScript == 0xFF)
            return;
      _scriptPointer = _scriptOrgPointer + vm.slot[_currentScript].offs;
}

/* Execute a script - Read opcode, and execute it from the table */
void ScummEngine::executeScript() {
      int c;
      while (_currentScript != 0xFF) {

            if (_showStack == 1) {
                  printf("Stack:");
                  for (c=0; c < _scummStackPos; c++) {
                        printf(" %d", _vmStack[c]);
                  }
                  printf("\n");
            }
            _opcode = fetchScriptByte();
            vm.slot[_currentScript].didexec = 1;
            debugC(DEBUG_OPCODES, "Script %d, offset 0x%x: [%X] %s()",
                        vm.slot[_currentScript].number,
                        _scriptPointer - _scriptOrgPointer,
                        _opcode,
                        getOpcodeDesc(_opcode));
            if (_hexdumpScripts == true) {
                  for (c= -1; c < 15; c++) {
                        printf(" %02x", *(_scriptPointer + c));
                  }
                  printf("\n");
            }
            executeOpcode(_opcode);
      }
      CHECK_HEAP;
}

byte ScummEngine::fetchScriptByte() {
      if (*_lastCodePtr + sizeof(MemBlkHeader) != _scriptOrgPointer) {
            long oldoffs = _scriptPointer - _scriptOrgPointer;
            getScriptBaseAddress();
            _scriptPointer = _scriptOrgPointer + oldoffs;
      }
      return *_scriptPointer++;
}

uint ScummEngine::fetchScriptWord() {
      int a;
      if (*_lastCodePtr + sizeof(MemBlkHeader) != _scriptOrgPointer) {
            long oldoffs = _scriptPointer - _scriptOrgPointer;
            getScriptBaseAddress();
            _scriptPointer = _scriptOrgPointer + oldoffs;
      }
      a = READ_LE_UINT16(_scriptPointer);
      _scriptPointer += 2;
      return a;
}

int ScummEngine::fetchScriptWordSigned() {
      return (int16)fetchScriptWord();
}

int ScummEngine::readVar(uint var) {
      int a;

      debugC(DEBUG_VARS, "readvar(%d)", var);

      if ((var & 0x2000) && (_version <= 5)) {
            a = fetchScriptWord();
            if (a & 0x2000)
                  var += readVar(a & ~0x2000);
            else
                  var += a & 0xFFF;
            var &= ~0x2000;
      }

      if (!(var & 0xF000)) {
            if (!_copyProtection) {
                  if (var == 490 && _gameId == GID_MONKEY2) {
                        var = 518;
                  }
            }

            if (VAR_SUBTITLES != 0xFF && var == VAR_SUBTITLES) {
                  return ConfMan.getBool("subtitles");
            }
            if (VAR_NOSUBTITLES != 0xFF && var == VAR_NOSUBTITLES) {
                  return !ConfMan.getBool("subtitles");
            }

            checkRange(_numVariables - 1, 0, var, "Variable %d out of range(r)");
            return _scummVars[var];
      }

      if (var & 0x8000) {
            if (_heversion >= 80) {
                  var &= 0xFFF;
                  checkRange(_numRoomVariables - 1, 0, var, "Room variable %d out of range(w)");
                  return _roomVars[var];

            } else if ((_gameId == GID_ZAK256) || (_features & GF_OLD_BUNDLE) ||
                  (_gameId == GID_LOOM && (_platform == Common::kPlatformFMTowns))) {
                  int bit = var & 0xF;
                  var = (var >> 4) & 0xFF;

                  if (!_copyProtection) {
                        if (_gameId == GID_LOOM && (_platform == Common::kPlatformFMTowns) && var == 214 && bit == 15) {
                              return 0;
                        } else if (_gameId == GID_ZAK256 && var == 151 && bit == 8) {
                              return 0;
                        }
                  }

                  checkRange(_numVariables - 1, 0, var, "Variable %d out of range(rzb)");
                  return (_scummVars[ var ] & ( 1 << bit ) ) ? 1 : 0;
            } else {
                  var &= 0x7FFF;
                  if (!_copyProtection) {
                        if (_gameId == GID_INDY3 && (_platform == Common::kPlatformFMTowns) && var == 1508)
                              return 0;
                  }

                  checkRange(_numBitVariables - 1, 0, var, "Bit variable %d out of range(r)");
                  return (_bitVars[var >> 3] & (1 << (var & 7))) ? 1 : 0;
            }
      }

      if (var & 0x4000) {
            if (_features & GF_FEW_LOCALS) {
                  var &= 0xF;
            } else {
                  var &= 0xFFF;
            }

            if (_heversion >= 80)
                  checkRange(25, 0, var, "Local variable %d out of range(r)");
            else
                  checkRange(20, 0, var, "Local variable %d out of range(r)");
            return vm.localvar[_currentScript][var];
      }

      error("Illegal varbits (r)");
      return -1;
}

void ScummEngine::writeVar(uint var, int value) {
      debugC(DEBUG_VARS, "writeVar(%d, %d)", var, value);

      if (!(var & 0xF000)) {
            checkRange(_numVariables - 1, 0, var, "Variable %d out of range(w)");

            if (VAR_SUBTITLES != 0xFF && var == VAR_SUBTITLES) {
                  assert(value == 0 || value == 1);
                  ConfMan.set("subtitles", value);
            }
            if (VAR_NOSUBTITLES != 0xFF && var == VAR_NOSUBTITLES) {
                  // Ignore default setting in HE60/61 games
                  if ((_heversion >= 60 && _heversion <= 61) && vm.slot[_currentScript].number == 1)
                        return;
                  assert(value == 0 || value == 1);
                  ConfMan.set("subtitles", !value);
            }

            if (var == VAR_CHARINC && ConfMan.hasKey("talkspeed")) {
                  uint talkspeed = ConfMan.getInt("talkspeed");
                  if (talkspeed <= 9)
                        VAR(VAR_CHARINC) = talkspeed;
            } else {
                  _scummVars[var] = value;
            }

            if ((_varwatch == (int)var) || (_varwatch == 0)) {
                  if (vm.slot[_currentScript].number < 100)
                        debug(1, "vars[%d] = %d (via script-%d)", var, value, vm.slot[_currentScript].number);
                  else
                        debug(1, "vars[%d] = %d (via room-%d-%d)", var, value, _currentRoom,
                                          vm.slot[_currentScript].number);
            }
            return;
      }

      if (var & 0x8000) {
            if (_heversion >= 80) {
                  var &= 0xFFF;
                  checkRange(_numRoomVariables - 1, 0, var, "Room variable %d out of range(w)");
                  _roomVars[var] = value;

            } else if ((_gameId == GID_ZAK256) || (_features & GF_OLD_BUNDLE) ||
                  (_gameId == GID_LOOM && (_platform == Common::kPlatformFMTowns))) {
                  // In the old games, the bit variables were using the same memory
                  // as the normal variables!
                  int bit = var & 0xF;
                  var = (var >> 4) & 0xFF;
                  checkRange(_numVariables - 1, 0, var, "Variable %d out of range(wzb)");
                  if (value)
                        _scummVars[var] |= ( 1 << bit );
                  else
                        _scummVars[var] &= ~( 1 << bit );
            } else {
                  var &= 0x7FFF;
                  checkRange(_numBitVariables - 1, 0, var, "Bit variable %d out of range(w)");

                  if (value)
                        _bitVars[var >> 3] |= (1 << (var & 7));
                  else
                        _bitVars[var >> 3] &= ~(1 << (var & 7));
            }
            return;
      }

      if (var & 0x4000) {
            if (_features & GF_FEW_LOCALS) {
                  var &= 0xF;
            } else {
                  var &= 0xFFF;
            }

            if (_heversion >= 80)
                  checkRange(25, 0, var, "Local variable %d out of range(w)");
            else
                  checkRange(20, 0, var, "Local variable %d out of range(w)");

            vm.localvar[_currentScript][var] = value;
            return;
      }

      error("Illegal varbits (w)");
}

void ScummEngine::getResultPos() {
      int a;

      _resultVarNumber = fetchScriptWord();
      if (_resultVarNumber & 0x2000) {
            a = fetchScriptWord();
            if (a & 0x2000) {
                  _resultVarNumber += readVar(a & ~0x2000);
            } else {
                  _resultVarNumber += a & 0xFFF;
            }
            _resultVarNumber &= ~0x2000;
      }
}

void ScummEngine::setResult(int value) {
      writeVar(_resultVarNumber, value);
}

void ScummEngine::push(int a) {
      assert(_scummStackPos >= 0 && _scummStackPos < ARRAYSIZE(_vmStack));
      debug(9, "push %d", a);
      _vmStack[_scummStackPos++] = a;
}

int ScummEngine::pop() {
      if (_scummStackPos < 1 || _scummStackPos > ARRAYSIZE(_vmStack)) {
            error("No items on stack to pop() for %s (0x%X) at [%d-%d]", getOpcodeDesc(_opcode), _opcode, _roomResource, vm.slot[_currentScript].number);
      }
      --_scummStackPos;
      debug(9, "pop %d", _vmStack[_scummStackPos]);
      return _vmStack[_scummStackPos];
}

void ScummEngine::stopObjectCode() {
      ScriptSlot *ss;

      ss = &vm.slot[_currentScript];
      if (ss->cutsceneOverride == 255) {  /* FIXME: What does this? */
            warning("Cutscene for script %d has overflown. Resetting.", ss->number);
            ss->cutsceneOverride = 0;
      }

      if (ss->where != WIO_GLOBAL && ss->where != WIO_LOCAL) {
            if (ss->cutsceneOverride) {
                  if (_version >= 5)
                        warning("Object %d ending with active cutscene/override (%d)", ss->number, ss->cutsceneOverride);
                  ss->cutsceneOverride = 0;
            }
      } else {
            if (ss->cutsceneOverride) {
                  if (_version >= 5)
                        warning("Script %d ending with active cutscene/override (%d)", ss->number, ss->cutsceneOverride);
                  ss->cutsceneOverride = 0;
            }
      }
      nukeArrays(_currentScript);
      ss->number = 0;
      ss->status = ssDead;
      _currentScript = 0xFF;
}

void ScummEngine::runInventoryScript(int i) {
      int args[24];
      memset(args, 0, sizeof(args));
      args[0] = i;
      if (VAR(VAR_INVENTORY_SCRIPT)) {
            if (_gameId == GID_INDY3 && _platform == Common::kPlatformMacintosh) {
                  inventoryScript();
            } else {
                  runScript(VAR(VAR_INVENTORY_SCRIPT), 0, 0, args);
            }
      }
}

void ScummEngine::inventoryScript() {
      VerbSlot *vs;
      int args[24];
      int j, slot;

      memset(args, 0, sizeof(args));

      if (VAR(67) < 0) {
            VAR(67) = 0;
      }
      args[5] = getInventoryCount(VAR(VAR_EGO));
      if (args[5] <= 6) {
            VAR(67) = 0;
      }
      if (args[5] >= 6) {
            args[5] -= 6;
      }
      args[6] = 0;
      if (VAR(67) >= args[5]) {
            VAR(67) = args[5];
            args[4] = args[5];
            args[5] /= 2;
            args[5] *= 2;
            args[4] -= args[5];
            if (args[4]) {
                  VAR(67)++;
            }
            args[6]++;
      }
      args[2] = 1;
      for (j = 1; j < 7; j++) {
            args[1] = (VAR(67) + args[2]);
            args[3] = findInventory(VAR(VAR_EGO),args[1]);
            VAR(82 + args[2]) = args[3];
            args[2]++;
      }

      byte tmp[6];

      tmp[0] = 0xFF;
      tmp[1] = 0x06;
      tmp[3] = 0x00;
      tmp[4] = 0x00;

      for (j = 0; j < 6; j++) {
            tmp[2] = 0x53 + j;

            slot = getVerbSlot(101 + j, 0);
            vs = &_verbs[slot];
            loadPtrToResource(rtVerb, slot, tmp);
            vs->type = kTextVerbType;
            vs->imgindex = 0;
            vs->curmode = 1;
            drawVerb(slot, 0);
      }

      args[5] = getInventoryCount(VAR(VAR_EGO));
      if (args[5] > 6) {
            slot = getVerbSlot(107, 0);
            if (VAR(67)) {
                  vs = &_verbs[slot];
                  vs->curmode = 1;
            } else {
                  vs = &_verbs[slot];
                  vs->curmode = 0;
            }
            drawVerb(slot, 0);
            slot = getVerbSlot(108, 0);
            if (!args[6]) {
                  vs = &_verbs[slot];
                  vs->curmode = 1;
            } else {
                  vs = &_verbs[slot];
                  vs->curmode = 0;
            }
            drawVerb(slot, 0);
      } else {
            slot = getVerbSlot(107, 0);
            vs = &_verbs[slot];
            vs->curmode = 0;
            drawVerb(slot, 0);
            slot = getVerbSlot(108, 0);
            vs = &_verbs[slot];
            vs->curmode = 0;
            drawVerb(slot, 0);
      }

      verbMouseOver(0);
}

void ScummEngine::freezeScripts(int flag) {
      int i;

      if (_version <= 2) {
            for (i = 0; i < NUM_SCRIPT_SLOT; i++) {
                  if (_currentScript != i && vm.slot[i].status != ssDead && !vm.slot[i].freezeResistant) {
                        vm.slot[i].status |= 0x80;
                        vm.slot[i].freezeCount = 1;
                  }
            }
            return;
      }

      for (i = 0; i < NUM_SCRIPT_SLOT; i++) {
            if (_currentScript != i && vm.slot[i].status != ssDead && (!vm.slot[i].freezeResistant || flag >= 0x80)) {
                  vm.slot[i].status |= 0x80;
                  vm.slot[i].freezeCount++;
            }
      }

      for (i = 0; i < NUM_SENTENCE; i++)
            _sentence[i].freezeCount++;

      if (vm.cutSceneScriptIndex != 0xFF) {
            vm.slot[vm.cutSceneScriptIndex].status &= 0x7F;
            vm.slot[vm.cutSceneScriptIndex].freezeCount = 0;
      }
}

void ScummEngine::unfreezeScripts() {
      int i;

      if (_version <= 2) {
            for (i = 0; i < NUM_SCRIPT_SLOT; i++) {
                  vm.slot[i].status &= 0x7F;
                  vm.slot[i].freezeCount = 0;
            }
            return;
      }

      for (i = 0; i < NUM_SCRIPT_SLOT; i++) {
            if (vm.slot[i].status & 0x80) {
                  if (!--vm.slot[i].freezeCount) {
                        vm.slot[i].status &= 0x7F;
                  }
            }
      }

      for (i = 0; i < NUM_SENTENCE; i++) {
            if (_sentence[i].freezeCount > 0)
                  _sentence[i].freezeCount--;
      }
}


void ScummEngine::runAllScripts() {
      int i;

      for (i = 0; i < NUM_SCRIPT_SLOT; i++)
            vm.slot[i].didexec = 0;

      // FIXME - why is _curExecScript?!? The only place it is ever set is here.
      // The outer world will only see it as consequence of the calls made in the following
      // for loop. But in that case, _curExecScript will be equal to _currentScript. Hence
      // it would seem we can replace all occurances of _curExecScript by _currentScript.
      _currentScript = 0xFF;
      int numCycles = (_heversion >= 90) ? VAR(VAR_NUM_SCRIPT_CYCLES) : 1;

      for (int cycle = 1; cycle <= numCycles; cycle++) {
            for (_curExecScript = 0; _curExecScript < NUM_SCRIPT_SLOT; _curExecScript++) {
                  if (vm.slot[_curExecScript].cycle == cycle && vm.slot[_curExecScript].status == ssRunning && vm.slot[_curExecScript].didexec == 0) {
                        _currentScript = (byte)_curExecScript;
                        getScriptBaseAddress();
                        getScriptEntryPoint();
                        executeScript();
                  }
            }
      }
}

void ScummEngine::runExitScript() {
      if (_version > 2 && VAR(VAR_EXIT_SCRIPT))
            runScript(VAR(VAR_EXIT_SCRIPT), 0, 0, 0);
      if (_EXCD_offs) {
            int slot = getScriptSlot();
            vm.slot[slot].status = ssRunning;
            vm.slot[slot].number = 10001;
            vm.slot[slot].where = WIO_ROOM;
            vm.slot[slot].offs = _EXCD_offs;
            vm.slot[slot].freezeResistant = false;
            vm.slot[slot].recursive = false;
            vm.slot[slot].freezeCount = 0;
            vm.slot[slot].delayFrameCount = 0;
            vm.slot[slot].cycle = 1;

            // FIXME: the exit script of room 7 in indy3 only seems to have a size
            // and tag not actual data not even a 00 (stop code). Maybe we should
            // be limiting ourselves to strictly reading the size from the header?
            if (_gameId == GID_INDY3 && !(_features & GF_OLD_BUNDLE)) {
                  byte *roomptr = getResourceAddress(rtRoom, _roomResource);
                  const byte *excd = findResourceData(MKID('EXCD'), roomptr) - _resourceHeaderSize;
                  if (!excd || (getResourceDataSize(excd) < 1)) {
                        debug(2, "Exit-%d is empty", _roomResource);
                        return;
                  }
            }

            initializeLocals(slot, 0);
            runScriptNested(slot);
      }
      if (_version > 2 && VAR(VAR_EXIT_SCRIPT2))
            runScript(VAR(VAR_EXIT_SCRIPT2), 0, 0, 0);
}

void ScummEngine::runEntryScript() {
      if (_version > 2 && VAR(VAR_ENTRY_SCRIPT))
            runScript(VAR(VAR_ENTRY_SCRIPT), 0, 0, 0);
      if (_ENCD_offs) {
            int slot = getScriptSlot();
            vm.slot[slot].status = ssRunning;
            vm.slot[slot].number = 10002;
            vm.slot[slot].where = WIO_ROOM;
            vm.slot[slot].offs = _ENCD_offs;
            vm.slot[slot].freezeResistant = false;
            vm.slot[slot].recursive = false;
            vm.slot[slot].freezeCount = 0;
            vm.slot[slot].delayFrameCount = 0;
            vm.slot[slot].cycle = 1;
            initializeLocals(slot, 0);
            runScriptNested(slot);
      }
      if (_version > 2 && VAR(VAR_ENTRY_SCRIPT2))
            runScript(VAR(VAR_ENTRY_SCRIPT2), 0, 0, 0);
}

void ScummEngine::killScriptsAndResources() {
      ScriptSlot *ss;
      int i;

      ss = vm.slot;
      for (i = 0; i < NUM_SCRIPT_SLOT; i++, ss++) {
            if (ss->where == WIO_ROOM || ss->where == WIO_FLOBJECT) {
                  if (ss->cutsceneOverride) {
                        if (_version >= 5)
                              warning("Object %d stopped with active cutscene/override in exit", ss->number);
                        ss->cutsceneOverride = 0;
                  }
                  nukeArrays(i);
                  ss->status = ssDead;
            } else if (ss->where == WIO_LOCAL) {
                  if (ss->cutsceneOverride) {
                        if (_version >= 5)
                              warning("Script %d stopped with active cutscene/override in exit", ss->number);
                        ss->cutsceneOverride = 0;
                  }
                  nukeArrays(i);
                  ss->status = ssDead;
            }
      }

      /* Nuke local object names */
      if (_newNames) {
            for (i = 0; i < _numNewNames; i++) {
                  const int obj = _newNames[i];
                  if (obj) {
                        const int owner = getOwner(obj);
                        // We can delete custom name resources if either the object is
                        // no longer in use (i.e. not owned by anyone anymore); or if
                        // it is an object which is owned by a room.
                        if (owner == 0 || (_version < 7 && owner == OF_OWNER_ROOM)) {
                              // WORKAROUND for a problem mentioned in bug report #941275:
                              // In FOA in the sentry room, in the chest plate of the statue,
                              // the pegs may be renamed to mouth: this custom name is lost
                              // when leaving the room; this hack prevents this).
                              if (owner == OF_OWNER_ROOM && _gameId == GID_INDY4 && 336 <= obj && obj <= 340)
                                    continue;

                              _newNames[i] = 0;
                              res.nukeResource(rtObjectName, i);
                        }
                  }
            }
      }
}

void ScummEngine::killAllScriptsExceptCurrent() {
      for (int i = 0; i < NUM_SCRIPT_SLOT; i++) {
            if (i != _currentScript) {
                  vm.slot[i].status = ssDead;
                  if (_version == 6)
                        vm.slot[i].cutsceneOverride = 0;
            }
      }
}

void ScummEngine::doSentence(int verb, int objectA, int objectB) {
      SentenceTab *st;

      if (_version >= 7) {

            if (objectA == objectB)
                  return;

            if (_sentenceNum) {
                  st = &_sentence[_sentenceNum - 1];

                  // Check if this doSentence request is identical to the previous one;
                  // if yes, ignore this invocation.
                  if (_sentenceNum && st->verb == verb && st->objectA == objectA && st->objectB == objectB)
                        return;
            }

      }

      st = &_sentence[_sentenceNum++];

      st->verb = verb;
      st->objectA = objectA;
      st->objectB = objectB;
      st->preposition = (objectB != 0);
      st->freezeCount = 0;
}

void ScummEngine::checkAndRunSentenceScript() {
      int i;
      int localParamList[24];
      const ScriptSlot *ss;
      int sentenceScript;
      if (_version <= 2)
            sentenceScript = 2;
      else
            sentenceScript = VAR(VAR_SENTENCE_SCRIPT);

      memset(localParamList, 0, sizeof(localParamList));
      if (isScriptInUse(sentenceScript)) {
            ss = vm.slot;
            for (i = 0; i < NUM_SCRIPT_SLOT; i++, ss++)
                  if (ss->number == sentenceScript && ss->status != ssDead && ss->freezeCount == 0)
                        return;
      }

      if (!_sentenceNum || _sentence[_sentenceNum - 1].freezeCount)
            return;

      _sentenceNum--;

      if (_version < 7)
            if (_sentence[_sentenceNum].preposition && _sentence[_sentenceNum].objectB == _sentence[_sentenceNum].objectA)
                  return;

      if (_version <= 2) {
            _scummVars[VAR_ACTIVE_VERB] = _sentence[_sentenceNum].verb;
            _scummVars[VAR_ACTIVE_OBJECT1] = _sentence[_sentenceNum].objectA;
            _scummVars[VAR_ACTIVE_OBJECT2] = _sentence[_sentenceNum].objectB;
            _scummVars[VAR_VERB_ALLOWED] = (0 != getVerbEntrypoint(_sentence[_sentenceNum].objectA, _sentence[_sentenceNum].verb));
      } else {
            localParamList[0] = _sentence[_sentenceNum].verb;
            localParamList[1] = _sentence[_sentenceNum].objectA;
            localParamList[2] = _sentence[_sentenceNum].objectB;
      }
      _currentScript = 0xFF;
      if (sentenceScript)
            runScript(sentenceScript, 0, 0, localParamList);
}

void ScummEngine::runInputScript(int a, int cmd, int mode) {
      int args[24];
      int verbScript;

      if (_gameId == GID_MANIAC && _platform == Common::kPlatformC64) {
            verbScript = 3;
            //_scummVars[9] = cmd;

      } else if (_version <= 2) {
            verbScript = 4;
            _scummVars[VAR_CLICK_AREA] = a;
            switch (a) {
            case 1:           // Verb clicked
                  _scummVars[33] = cmd;
                  break;
            case 3:           // Inventory clicked
                  _scummVars[35] = cmd;
                  break;
            }
      } else {
            verbScript = VAR(VAR_VERB_SCRIPT);
      }

      memset(args, 0, sizeof(args));
      args[0] = a;
      args[1] = cmd;
      args[2] = mode;
      // All HE 72+ games but only some HE 71 games.
      if (_heversion >= 71) {
            args[3] = VAR(VAR_VIRT_MOUSE_X);
            args[4] = VAR(VAR_VIRT_MOUSE_Y);
      }

      // Macintosh verison of indy3ega used different interface, so adjust values.
      if (_gameId == GID_INDY3 && _platform == Common::kPlatformMacintosh) {
            if (a == 1 && (cmd >= 101 && cmd <= 108)) {
                  if (cmd == 107) {
                        VAR(67) -= 2;
                        inventoryScript();
                        return;
                  } else if (cmd == 108) {
                        VAR(67) += 2;
                        inventoryScript();
                        return;
                  } else {
                        args[0] = 3;
                        args[1] = VAR(83 + (cmd - 101));
                  }
            }
      }

      if (verbScript)
            runScript(verbScript, 0, 0, args);
}

void ScummEngine::decreaseScriptDelay(int amount) {
      ScriptSlot *ss = vm.slot;
      int i;
      for (i = 0; i < NUM_SCRIPT_SLOT; i++, ss++) {
            if (ss->status == ssPaused) {
                  ss->delay -= amount;
                  if (ss->delay < 0) {
                        ss->status = ssRunning;
                        ss->delay = 0;
                  }
            }
      }
}

bool ScummEngine::isScriptInUse(int script) const {
      int i;
      const ScriptSlot *ss = vm.slot;
      for (i = 0; i < NUM_SCRIPT_SLOT; i++, ss++)
            if (ss->number == script)
                  return true;
      return false;
}

bool ScummEngine::isScriptRunning(int script) const {
      int i;
      const ScriptSlot *ss = vm.slot;
      for (i = 0; i < NUM_SCRIPT_SLOT; i++, ss++)
            if (ss->number == script && (ss->where == WIO_GLOBAL || ss->where == WIO_LOCAL) && ss->status != ssDead)
                  return true;
      return false;
}

bool ScummEngine::isRoomScriptRunning(int script) const {
      int i;
      const ScriptSlot *ss = vm.slot;
      for (i = 0; i < NUM_SCRIPT_SLOT; i++, ss++)
            if (ss->number == script && ss->where == WIO_ROOM && ss->status != ssDead)
                  return true;
      return false;
}

void ScummEngine::copyScriptString(byte *dst) {
      int len = resStrLen(_scriptPointer) + 1;
      while (len--)
            *dst++ = fetchScriptByte();
      *dst = 0;
}

//
// Given a pointer to a Scumm string, this function returns the total byte length
// of the string data in that resource. To do so it has to understand certain
// special characters embedded into the string. The reason for this function is that
// sometimes this embedded data contains zero bytes, thus we can't just use strlen.
//
int ScummEngine::resStrLen(const byte *src) const {
      int num = 0;
      byte chr;
      if (src == NULL)
            src = _scriptPointer;
      while ((chr = *src++) != 0) {
            num++;
            if (chr == 255) {
                  chr = *src++;
                  num++;

                  // WORKAROUND for bug #985948, a script bug in Indy3. See also
                  // the corresponding code in ScummEngine::convertMessageToString().
                  if (_gameId == GID_INDY3 && chr == 0x2E) {
                        continue;
                  }

                  if (chr != 1 && chr != 2 && chr != 3 && chr != 8) {
                        if (_version == 8) {
                              src += 4;
                              num += 4;
                        } else {
                              src += 2;
                              num += 2;
                        }
                  }
            }
      }
      return num;
}

void ScummEngine::beginCutscene(int *args) {
      int scr = _currentScript;
      vm.slot[scr].cutsceneOverride++;

      if (++vm.cutSceneStackPointer > ARRAYSIZE(vm.cutSceneData))
            error("Cutscene stack overflow");

      vm.cutSceneData[vm.cutSceneStackPointer] = args[0];
      vm.cutSceneScript[vm.cutSceneStackPointer] = 0;
      vm.cutScenePtr[vm.cutSceneStackPointer] = 0;

      vm.cutSceneScriptIndex = scr;
      if (VAR(VAR_CUTSCENE_START_SCRIPT))
            runScript(VAR(VAR_CUTSCENE_START_SCRIPT), 0, 0, args);
      vm.cutSceneScriptIndex = 0xFF;
}

void ScummEngine::endCutscene() {
      ScriptSlot *ss = &vm.slot[_currentScript];
      int args[16];

      if (ss->cutsceneOverride > 0) // Only terminate if active
            ss->cutsceneOverride--;

      memset(args, 0, sizeof(args));
      args[0] = vm.cutSceneData[vm.cutSceneStackPointer];

      VAR(VAR_OVERRIDE) = 0;

      if (vm.cutScenePtr[vm.cutSceneStackPointer] && (ss->cutsceneOverride > 0))    // Only terminate if active
            ss->cutsceneOverride--;

      vm.cutSceneScript[vm.cutSceneStackPointer] = 0;
      vm.cutScenePtr[vm.cutSceneStackPointer] = 0;
      vm.cutSceneStackPointer--;

      if (VAR(VAR_CUTSCENE_END_SCRIPT))
            runScript(VAR(VAR_CUTSCENE_END_SCRIPT), 0, 0, args);
}

void ScummEngine::abortCutscene() {
      const int idx = vm.cutSceneStackPointer;
      assert(0 <= idx && idx < 5);

      uint32 offs = vm.cutScenePtr[idx];
      if (offs) {
            ScriptSlot *ss = &vm.slot[vm.cutSceneScript[idx]];
            ss->offs = offs;
            ss->status = ssRunning;
            ss->freezeCount = 0;

            if (ss->cutsceneOverride > 0)
                  ss->cutsceneOverride--;

            VAR(VAR_OVERRIDE) = 1;
            vm.cutScenePtr[idx] = 0;

            // HACK to fix issues with SMUSH and the way it does keyboard handling.
            // In particular, normally abortCutscene() is being called while no
            // scripts are active. But SMUSH runs from *inside* the script engine.
            // And it calls abortCutscene() if ESC is pressed... not good.
            // Proper fix might be to let SMUSH/INSANE run from outside the script
            // engine but that would require lots of changes and may actually have
            // negative effects, too. So we cheat here, to fix bug #751670.
            if (_version == 7)
                  getScriptEntryPoint();

      }
}

void ScummEngine::beginOverride() {
      const int idx = vm.cutSceneStackPointer;
      assert(0 <= idx && idx < 5);

      vm.cutScenePtr[idx] = _scriptPointer - _scriptOrgPointer;
      vm.cutSceneScript[idx] = _currentScript;

      // Skip the jump instruction following the override instruction
      // (the jump is responsible for "skipping" cutscenes, and the reason
      // why we record the current script position in vm.cutScenePtr).
      fetchScriptByte();
      fetchScriptWord();

      // This is based on disassembly
      VAR(VAR_OVERRIDE) = 0;
}

void ScummEngine::endOverride() {
      const int idx = vm.cutSceneStackPointer;
      assert(0 <= idx && idx < 5);

      vm.cutScenePtr[idx] = 0;
      vm.cutSceneScript[idx] = 0;

      if (_version > 3)
            VAR(VAR_OVERRIDE) = 0;
}

} // End of namespace Scumm

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