/*************************************************************************** cheat.c MAME cheat system. **************************************************************************** Copyright Aaron Giles All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name 'MAME' nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. **************************************************************************** Cheat XML format: text ... ... ... text ... ... **************************************************************************** Expressions are standard debugger expressions. Note that & and < must be escaped per XML rules. Within attributes you must use & and <. For tags, you can also use . Each cheat has its own context-specific variables: temp0-temp9 -- 10 temporary variables for any use param -- the current value of the cheat parameter frame -- the current frame index argindex -- for arguments with multiple iterations, this is the index By default, each cheat has 10 temporary variables that are persistent while executing its scripts. Additional temporary variables may be requested via the 'tempvariables' attribute on the cheat. **************************************************************************** Cheats are generally broken down into categories based on which actions are defined and whether or not there is a parameter present: ---- Actions ----- On Off Run Chg Param? Type === === === === ====== ================================= N N N ? None Text-only (displays text in menu) Y N N ? None Oneshot (select to activate) Y Y N ? None On/Off (select to toggle) ? ? Y ? None On/Off (select to toggle) ? N N Y Any Oneshot parameter (select to alter) ? Y ? ? Value Value parameter (off or a live value) ? ? Y ? Value Value parameter (off or a live value) ? Y ? ? List Item list parameter (off or a live value) ? ? Y ? List Item list parameter (off or a live value) ***************************************************************************/ #include "emu.h" #include "emuopts.h" #include "xmlfile.h" #include "ui.h" #include "cheat.h" #include "debug/debugcpu.h" #include //************************************************************************** // PARAMETERS //************************************************************************** // turn this on to enable removing duplicate cheats; not sure if we should #define REMOVE_DUPLICATE_CHEATS 0 //************************************************************************** // NUMBER AND FORMAT //************************************************************************** //------------------------------------------------- // format - format an integer according to // the format //------------------------------------------------- inline const char *number_and_format::format(astring &string) const { switch (m_format) { default: case XML_INT_FORMAT_DECIMAL: string.printf("%d", (UINT32)m_value); break; case XML_INT_FORMAT_DECIMAL_POUND: string.printf("#%d", (UINT32)m_value); break; case XML_INT_FORMAT_HEX_DOLLAR: string.printf("$%X", (UINT32)m_value); break; case XML_INT_FORMAT_HEX_C: string.printf("0x%X", (UINT32)m_value); break; } return string; } //************************************************************************** // CHEAT PARAMETER //************************************************************************** //------------------------------------------------- // cheat_parameter - constructor //------------------------------------------------- cheat_parameter::cheat_parameter(cheat_manager &manager, symbol_table &symbols, const char *filename, xml_data_node ¶mnode) : m_value(0), m_itemlist(manager.machine().respool()) { // read the core attributes m_minval = number_and_format(xml_get_attribute_int(¶mnode, "min", 0), xml_get_attribute_int_format(¶mnode, "min")); m_maxval = number_and_format(xml_get_attribute_int(¶mnode, "max", 0), xml_get_attribute_int_format(¶mnode, "max")); m_stepval = number_and_format(xml_get_attribute_int(¶mnode, "step", 1), xml_get_attribute_int_format(¶mnode, "step")); // iterate over items for (xml_data_node *itemnode = xml_get_sibling(paramnode.child, "item"); itemnode != NULL; itemnode = xml_get_sibling(itemnode->next, "item")) { // check for NULL text if (itemnode->value == NULL || itemnode->value[0] == 0) throw emu_fatalerror("%s.xml(%d): item is missing text\n", filename, itemnode->line); // check for non-existant value if (xml_get_attribute(itemnode, "value") == NULL) throw emu_fatalerror("%s.xml(%d): item is value\n", filename, itemnode->line); // extract the parameters UINT64 value = xml_get_attribute_int(itemnode, "value", 0); int format = xml_get_attribute_int_format(itemnode, "value"); // allocate and append a new item item &curitem = m_itemlist.append(*auto_alloc(manager.machine(), item(itemnode->value, value, format))); // ensure the maximum expands to suit m_maxval = MAX(m_maxval, curitem.value()); } // add a variable to the symbol table for our value symbols.add("param", symbol_table::READ_ONLY, &m_value); } //------------------------------------------------- // text - return the current text for a parameter //------------------------------------------------- const char *cheat_parameter::text() { // are we a value cheat? if (!has_itemlist()) m_curtext.format("%d (0x%X)", UINT32(m_value), UINT32(m_value)); // if not, we're an item cheat else { m_curtext.format("??? (%d)", UINT32(m_value)); for (item *curitem = m_itemlist.first(); curitem != NULL; curitem = curitem->next()) if (curitem->value() == m_value) { m_curtext.cpy(curitem->text()); break; } } return m_curtext; } //------------------------------------------------- // save - save a single cheat parameter //------------------------------------------------- void cheat_parameter::save(emu_file &cheatfile) const { // output the parameter tag cheatfile.printf("\t\t\n"); } // iterate over items else { for (const item *curitem = m_itemlist.first(); curitem != NULL; curitem = curitem->next()) cheatfile.printf("\t\t\t%s\n", curitem->value().format(string), curitem->text()); cheatfile.printf("\t\t\n"); } } //------------------------------------------------- // set_minimum_state - set the minimum state //------------------------------------------------- bool cheat_parameter::set_minimum_state() { UINT64 origvalue = m_value; // set based on whether we have an item list m_value = (!has_itemlist()) ? m_minval : m_itemlist.first()->value(); return (m_value != origvalue); } //------------------------------------------------- // set_minimum_state - set the previous state //------------------------------------------------- bool cheat_parameter::set_prev_state() { UINT64 origvalue = m_value; // are we a value cheat? if (!has_itemlist()) { if (m_value < m_minval + m_stepval) m_value = m_minval; else m_value -= m_stepval; } // if not, we're an item cheat else { item *curitem, *previtem = NULL; for (curitem = m_itemlist.first(); curitem != NULL; previtem = curitem, curitem = curitem->next()) if (curitem->value() == m_value) break; if (previtem != NULL) m_value = previtem->value(); } return (m_value != origvalue); } //------------------------------------------------- // set_next_state - advance to the next state //------------------------------------------------- bool cheat_parameter::set_next_state() { UINT64 origvalue = m_value; // are we a value cheat? if (!has_itemlist()) { if (m_value > m_maxval - m_stepval) m_value = m_maxval; else m_value += m_stepval; } // if not, we're an item cheat else { item *curitem; for (curitem = m_itemlist.first(); curitem != NULL; curitem = curitem->next()) if (curitem->value() == m_value) break; if (curitem != NULL && curitem->next() != NULL) m_value = curitem->next()->value(); } return (m_value != origvalue); } //************************************************************************** // CHEAT SCRIPT //************************************************************************** //------------------------------------------------- // cheat_script - constructor //------------------------------------------------- cheat_script::cheat_script(cheat_manager &manager, symbol_table &symbols, const char *filename, xml_data_node &scriptnode) : m_entrylist(manager.machine().respool()), m_state(SCRIPT_STATE_RUN) { // read the core attributes const char *state = xml_get_attribute_string(&scriptnode, "state", "run"); if (strcmp(state, "on") == 0) m_state = SCRIPT_STATE_ON; else if (strcmp(state, "off") == 0) m_state = SCRIPT_STATE_OFF; else if (strcmp(state, "change") == 0) m_state = SCRIPT_STATE_CHANGE; else if (strcmp(state, "run") != 0) throw emu_fatalerror("%s.xml(%d): invalid script state '%s'\n", filename, scriptnode.line, state); // iterate over nodes within the script for (xml_data_node *entrynode = scriptnode.child; entrynode != NULL; entrynode = entrynode->next) { // handle action nodes if (strcmp(entrynode->name, "action") == 0) m_entrylist.append(*auto_alloc(manager.machine(), script_entry(manager, symbols, filename, *entrynode, true))); // handle output nodes else if (strcmp(entrynode->name, "output") == 0) m_entrylist.append(*auto_alloc(manager.machine(), script_entry(manager, symbols, filename, *entrynode, false))); // anything else is ignored else { mame_printf_warning("%s.xml(%d): unknown script item '%s' will be lost if saved\n", filename, entrynode->line, entrynode->name); continue; } } } //------------------------------------------------- // execute - execute ourself //------------------------------------------------- void cheat_script::execute(cheat_manager &manager, UINT64 &argindex) { // do nothing if disabled if (!manager.enabled()) return; // iterate over entries for (script_entry *entry = m_entrylist.first(); entry != NULL; entry = entry->next()) entry->execute(manager, argindex); } //------------------------------------------------- // save - save a single cheat script //------------------------------------------------- void cheat_script::save(emu_file &cheatfile) const { // output the script tag cheatfile.printf("\t\t\n"); // output entries for (const script_entry *entry = m_entrylist.first(); entry != NULL; entry = entry->next()) entry->save(cheatfile); // close the tag cheatfile.printf("\t\t\n"); } //------------------------------------------------- // script_entry - constructor //------------------------------------------------- cheat_script::script_entry::script_entry(cheat_manager &manager, symbol_table &symbols, const char *filename, xml_data_node &entrynode, bool isaction) : m_next(NULL), m_condition(&symbols), m_expression(&symbols), m_arglist(manager.machine().respool()) { const char *expression = NULL; try { // read the condition if present expression = xml_get_attribute_string(&entrynode, "condition", NULL); if (expression != NULL) m_condition.parse(expression); // if this is an action, parse the expression if (isaction) { expression = entrynode.value; if (expression == NULL || expression[0] == 0) throw emu_fatalerror("%s.xml(%d): missing expression in action tag\n", filename, entrynode.line); m_expression.parse(expression); } // otherwise, parse the attributes and arguments else { // extract format const char *format = xml_get_attribute_string(&entrynode, "format", NULL); if (format == NULL || format[0] == 0) throw emu_fatalerror("%s.xml(%d): missing format in output tag\n", filename, entrynode.line); m_format.cpy(format); // extract other attributes m_line = xml_get_attribute_int(&entrynode, "line", 0); m_justify = JUSTIFY_LEFT; const char *align = xml_get_attribute_string(&entrynode, "align", "left"); if (strcmp(align, "center") == 0) m_justify = JUSTIFY_CENTER; else if (strcmp(align, "right") == 0) m_justify = JUSTIFY_RIGHT; else if (strcmp(align, "left") != 0) throw emu_fatalerror("%s.xml(%d): invalid alignment '%s' specified\n", filename, entrynode.line, align); // then parse arguments int totalargs = 0; for (xml_data_node *argnode = xml_get_sibling(entrynode.child, "argument"); argnode != NULL; argnode = xml_get_sibling(argnode->next, "argument")) { output_argument &curarg = m_arglist.append(*auto_alloc(manager.machine(), output_argument(manager, symbols, filename, *argnode))); // verify we didn't overrun the argument count totalargs += curarg.count(); if (totalargs > MAX_ARGUMENTS) throw emu_fatalerror("%s.xml(%d): too many arguments (found %d, max is %d)\n", filename, argnode->line, totalargs, MAX_ARGUMENTS); } // validate the format against the arguments validate_format(filename, entrynode.line); } } catch (expression_error &err) { throw emu_fatalerror("%s.xml(%d): error parsing cheat expression \"%s\" (%s)\n", filename, entrynode.line, expression, err.code_string()); } } //------------------------------------------------- // execute - execute a single script entry //------------------------------------------------- void cheat_script::script_entry::execute(cheat_manager &manager, UINT64 &argindex) { // evaluate the condition if (!m_condition.is_empty()) { try { UINT64 result = m_condition.execute(); if (result == 0) return; } catch (expression_error &err) { mame_printf_warning("Error executing conditional expression \"%s\": %s\n", m_condition.original_string(), err.code_string()); return; } } // if there is an action, execute it if (!m_expression.is_empty()) { try { m_expression.execute(); } catch (expression_error &err) { mame_printf_warning("Error executing expression \"%s\": %s\n", m_expression.original_string(), err.code_string()); } } // if there is a string to display, compute it if (m_format) { // iterate over arguments and evaluate them UINT64 params[MAX_ARGUMENTS]; int curarg = 0; for (output_argument *arg = m_arglist.first(); arg != NULL; arg = arg->next()) curarg += arg->values(argindex, ¶ms[curarg]); // generate the astring manager.get_output_astring(m_line, m_justify).printf(m_format, (UINT32)params[0], (UINT32)params[1], (UINT32)params[2], (UINT32)params[3], (UINT32)params[4], (UINT32)params[5], (UINT32)params[6], (UINT32)params[7], (UINT32)params[8], (UINT32)params[9], (UINT32)params[10], (UINT32)params[11], (UINT32)params[12], (UINT32)params[13], (UINT32)params[14], (UINT32)params[15], (UINT32)params[16], (UINT32)params[17], (UINT32)params[18], (UINT32)params[19], (UINT32)params[20], (UINT32)params[21], (UINT32)params[22], (UINT32)params[23], (UINT32)params[24], (UINT32)params[25], (UINT32)params[26], (UINT32)params[27], (UINT32)params[28], (UINT32)params[29], (UINT32)params[30], (UINT32)params[31]); } } //------------------------------------------------- // save - save a single action or output //------------------------------------------------- void cheat_script::script_entry::save(emu_file &cheatfile) const { astring tempstring; // output an action if (!m_format) { cheatfile.printf("\t\t\t%s\n", cheat_manager::quote_expression(tempstring, m_expression)); } // output an output else { cheatfile.printf("\t\t\t\n"); // output arguments else { cheatfile.printf(">\n"); for (const output_argument *curarg = m_arglist.first(); curarg != NULL; curarg = curarg->next()) curarg->save(cheatfile); cheatfile.printf("\t\t\t\n"); } } } //------------------------------------------------- // validate_format - check that a format string // has the correct number and type of arguments //------------------------------------------------- void cheat_script::script_entry::validate_format(const char *filename, int line) { // first count arguments int argsprovided = 0; for (const output_argument *curarg = m_arglist.first(); curarg != NULL; curarg = curarg->next()) argsprovided += curarg->count(); // now scan the string for valid argument usage const char *p = strchr(m_format, '%'); int argscounted = 0; while (p != NULL) { // skip past any valid attributes p++; while (strchr("lh0123456789.-+ #", *p) != NULL) p++; // look for a valid type if (strchr("cdiouxX", *p) == NULL) throw emu_fatalerror("%s.xml(%d): invalid format specification \"%s\"\n", filename, line, m_format.cstr()); argscounted++; // look for the next one p = strchr(p, '%'); } // did we match? if (argscounted < argsprovided) throw emu_fatalerror("%s.xml(%d): too many arguments provided (%d) for format \"%s\"\n", filename, line, argsprovided, m_format.cstr()); if (argscounted > argsprovided) throw emu_fatalerror("%s.xml(%d): not enough arguments provided (%d) for format \"%s\"\n", filename, line, argsprovided, m_format.cstr()); } //------------------------------------------------- // output_argument - constructor //------------------------------------------------- cheat_script::script_entry::output_argument::output_argument(cheat_manager &manager, symbol_table &symbols, const char *filename, xml_data_node &argnode) : m_next(NULL), m_expression(&symbols), m_count(0) { // first extract attributes m_count = xml_get_attribute_int(&argnode, "count", 1); // read the expression const char *expression = argnode.value; if (expression == NULL || expression[0] == 0) throw emu_fatalerror("%s.xml(%d): missing expression in argument tag\n", filename, argnode.line); // parse it try { m_expression.parse(expression); } catch (expression_error &err) { throw emu_fatalerror("%s.xml(%d): error parsing cheat expression \"%s\" (%s)\n", filename, argnode.line, expression, err.code_string()); } } //------------------------------------------------- // value - return the evaluated value of the // given output argument //------------------------------------------------- int cheat_script::script_entry::output_argument::values(UINT64 &argindex, UINT64 *result) { for (argindex = 0; argindex < m_count; argindex++) { try { result[argindex] = m_expression.execute(); } catch (expression_error &err) { mame_printf_warning("Error executing argument expression \"%s\": %s\n", m_expression.original_string(), err.code_string()); } } return m_count; } //------------------------------------------------- // save - save a single output argument //------------------------------------------------- void cheat_script::script_entry::output_argument::save(emu_file &cheatfile) const { astring tempstring; cheatfile.printf("\t\t\t\t%s\n", cheat_manager::quote_expression(tempstring, m_expression)); } //************************************************************************** // CHEAT ENTRY //************************************************************************** //------------------------------------------------- // cheat_entry - constructor //------------------------------------------------- cheat_entry::cheat_entry(cheat_manager &manager, symbol_table &globaltable, const char *filename, xml_data_node &cheatnode) : m_manager(manager), m_next(NULL), m_parameter(NULL), m_on_script(NULL), m_off_script(NULL), m_change_script(NULL), m_run_script(NULL), m_symbols(&manager.machine(), &globaltable), m_state(SCRIPT_STATE_OFF), m_numtemp(DEFAULT_TEMP_VARIABLES), m_argindex(0) { // reset scripts try { // pull the variable count out ahead of things int tempcount = xml_get_attribute_int(&cheatnode, "tempvariables", DEFAULT_TEMP_VARIABLES); if (tempcount < 1) throw emu_fatalerror("%s.xml(%d): invalid tempvariables attribute (%d)\n", filename, cheatnode.line, tempcount); // allocate memory for the cheat m_numtemp = tempcount; // get the description const char *description = xml_get_attribute_string(&cheatnode, "desc", NULL); if (description == NULL || description[0] == 0) throw emu_fatalerror("%s.xml(%d): empty or missing desc attribute on cheat\n", filename, cheatnode.line); m_description = description; // create the symbol table m_symbols.add("argindex", symbol_table::READ_ONLY, &m_argindex); astring tempname; for (int curtemp = 0; curtemp < tempcount; curtemp++) m_symbols.add(tempname.format("temp%d", curtemp), symbol_table::READ_WRITE); // read the first comment node xml_data_node *commentnode = xml_get_sibling(cheatnode.child, "comment"); if (commentnode != NULL) { // set the value if not NULL if (commentnode->value != NULL && commentnode->value[0] != 0) m_comment.cpy(commentnode->value); // only one comment is kept commentnode = xml_get_sibling(commentnode->next, "comment"); if (commentnode != NULL) mame_printf_warning("%s.xml(%d): only one comment node is retained; ignoring additional nodes\n", filename, commentnode->line); } // read the first parameter node xml_data_node *paramnode = xml_get_sibling(cheatnode.child, "parameter"); if (paramnode != NULL) { // load this parameter m_parameter = auto_alloc(manager.machine(), cheat_parameter(manager, m_symbols, filename, *paramnode)); // only one parameter allowed paramnode = xml_get_sibling(paramnode->next, "parameter"); if (paramnode != NULL) mame_printf_warning("%s.xml(%d): only one parameter node allowed; ignoring additional nodes\n", filename, paramnode->line); } // read the script nodes for (xml_data_node *scriptnode = xml_get_sibling(cheatnode.child, "script"); scriptnode != NULL; scriptnode = xml_get_sibling(scriptnode->next, "script")) { // load this entry cheat_script *curscript = auto_alloc(manager.machine(), cheat_script(manager, m_symbols, filename, *scriptnode)); // if we have a script already for this slot, it is an error cheat_script *&slot = script_for_state(curscript->state()); if (slot != NULL) mame_printf_warning("%s.xml(%d): only one on script allowed; ignoring additional scripts\n", filename, scriptnode->line); else slot = curscript; } } catch (emu_fatalerror &) { // call our destructor to clean up and re-throw this->~cheat_entry(); throw; } } //------------------------------------------------- // ~cheat_entry - destructor //------------------------------------------------- cheat_entry::~cheat_entry() { auto_free(m_manager.machine(), m_on_script); auto_free(m_manager.machine(), m_off_script); auto_free(m_manager.machine(), m_change_script); auto_free(m_manager.machine(), m_run_script); auto_free(m_manager.machine(), m_parameter); } //------------------------------------------------- // save - save a single cheat entry //------------------------------------------------- void cheat_entry::save(emu_file &cheatfile) const { // determine if we have scripts bool has_scripts = (m_off_script != NULL || m_on_script != NULL || m_run_script != NULL || m_change_script != NULL); // output the cheat tag cheatfile.printf("\t\n"); else { cheatfile.printf(">\n"); // save the comment if (m_comment) cheatfile.printf("\t\t\n", m_comment.cstr()); // output the parameter, if present if (m_parameter != NULL) m_parameter->save(cheatfile); // output the script nodes if (m_on_script != NULL) m_on_script->save(cheatfile); if (m_off_script != NULL) m_off_script->save(cheatfile); if (m_change_script != NULL) m_change_script->save(cheatfile); if (m_run_script != NULL) m_run_script->save(cheatfile); // close the cheat tag cheatfile.printf("\t\n"); } } //------------------------------------------------- // activate - activate a oneshot cheat //------------------------------------------------- bool cheat_entry::activate() { bool changed = false; // if cheats have been toggled off no point in even trying to do anything if (!m_manager.enabled()) return changed; // if we're a oneshot cheat, execute the "on" script and indicate change if (is_oneshot()) { execute_on_script(); changed = true; popmessage("Activated %s", m_description.cstr()); } // if we're a oneshot parameter cheat and we're active, execute the "state change" script and indicate change else if (is_oneshot_parameter() && m_state != SCRIPT_STATE_OFF) { execute_change_script(); changed = true; popmessage("Activated\n %s = %s", m_description.cstr(), m_parameter->text()); } return changed; } //------------------------------------------------- // select_default_state - select the default // state for a cheat, or activate a oneshot cheat //------------------------------------------------- bool cheat_entry::select_default_state() { bool changed = false; // if we're a oneshot cheat, there is no default state if (is_oneshot()) ; // all other types switch to the "off" state else changed = set_state(SCRIPT_STATE_OFF); return changed; } //------------------------------------------------- // select_previous_state - select the previous // state for a cheat //------------------------------------------------- bool cheat_entry::select_previous_state() { bool changed = false; // if we're a oneshot, there is no previous state if (is_oneshot()) ; // if we're on/off, toggle to off else if (is_onoff()) changed = set_state(SCRIPT_STATE_OFF); // if we have a parameter, set the previous state else if (m_parameter != NULL) { // if we're at our minimum, turn off if (m_parameter->is_minimum()) changed = set_state(SCRIPT_STATE_OFF); else { // if we changed, ensure we are in the running state and signal state change changed = m_parameter->set_prev_state(); if (changed) { set_state(SCRIPT_STATE_RUN); if (!is_oneshot_parameter()) execute_change_script(); } } } return changed; } //------------------------------------------------- // select_next_state - select the next state for // a cheat //------------------------------------------------- bool cheat_entry::select_next_state() { bool changed = false; // if we're a oneshot, there is no next state if (is_oneshot()) ; // if we're on/off, toggle to running state else if (is_onoff()) changed = set_state(SCRIPT_STATE_RUN); // if we have a parameter, set the next state else if (m_parameter != NULL) { // if we're off, switch on to the minimum state if (m_state == SCRIPT_STATE_OFF) { changed = set_state(SCRIPT_STATE_RUN); m_parameter->set_minimum_state(); } // otherwise, switch to the next state else changed = m_parameter->set_next_state(); // if we changed, signal a state change if (changed && !is_oneshot_parameter()) execute_change_script(); } return changed; } //------------------------------------------------- // menu_text - return the text needed to display // this cheat in a menu item //------------------------------------------------- void cheat_entry::menu_text(astring &description, astring &state, UINT32 &flags) { // description is standard description.cpy(m_description); state.reset(); flags = 0; // some cheat entries are just text for display if (is_text_only()) { if (description) { description.trimspace(); if (!description) description.cpy(MENU_SEPARATOR_ITEM); } flags = MENU_FLAG_DISABLE; } // if we have no parameter and no run or off script, it's a oneshot cheat else if (is_oneshot()) state.cpy("Set"); // if we have no parameter, it's just on/off else if (is_onoff()) { state.cpy((m_state == SCRIPT_STATE_RUN) ? "On" : "Off"); flags = (m_state != 0) ? MENU_FLAG_LEFT_ARROW : MENU_FLAG_RIGHT_ARROW; } // if we have a value parameter, compute it else if (m_parameter != NULL) { if (m_state == SCRIPT_STATE_OFF) { state.cpy(is_oneshot_parameter() ? "Set" : "Off"); flags = MENU_FLAG_RIGHT_ARROW; } else { state.cpy(m_parameter->text()); flags = MENU_FLAG_LEFT_ARROW; if (!m_parameter->is_maximum()) flags |= MENU_FLAG_RIGHT_ARROW; } } } //------------------------------------------------- // set_state - switch to the given state //------------------------------------------------- bool cheat_entry::set_state(script_state newstate) { // if we're already in the state, indicate no change if (m_state == newstate) return false; // change to the state and run the appropriate script m_state = newstate; if (newstate == SCRIPT_STATE_OFF) execute_off_script(); else if (newstate == SCRIPT_STATE_ON || newstate == SCRIPT_STATE_RUN) execute_on_script(); return true; } //------------------------------------------------- // script_for_state - get a reference to the // given script pointer //------------------------------------------------- cheat_script *&cheat_entry::script_for_state(script_state state) { switch (state) { case SCRIPT_STATE_ON: return m_on_script; case SCRIPT_STATE_OFF: return m_off_script; case SCRIPT_STATE_CHANGE: return m_change_script; default: case SCRIPT_STATE_RUN: return m_run_script; } } //************************************************************************** // CHEAT MANAGER //************************************************************************** //------------------------------------------------- // cheat_manager - constructor //------------------------------------------------- cheat_manager::cheat_manager(running_machine &machine) : m_machine(machine), m_cheatlist(machine.respool()), m_disabled(true), m_symtable(&machine) { // if the cheat engine is disabled, we're done if (!machine.options().cheat()) return; // request a callback machine.add_notifier(MACHINE_NOTIFY_FRAME, machine_notify_delegate(FUNC(cheat_manager::frame_update), this)); // create a global symbol table m_symtable.add("frame", symbol_table::READ_ONLY, &m_framecount); m_symtable.add("frombcd", NULL, 1, 1, execute_frombcd); m_symtable.add("tobcd", NULL, 1, 1, execute_tobcd); // we rely on the debugger expression callbacks; if the debugger isn't // enabled, we must jumpstart them manually if ((machine.debug_flags & DEBUG_FLAG_ENABLED) == 0) debug_cpu_init(machine); // configure for memory access (shared with debugger) debug_cpu_configure_memory(machine, m_symtable); // load the cheats reload(); } //------------------------------------------------- // set_enable - globally enable or disable the // cheat engine //------------------------------------------------- void cheat_manager::set_enable(bool enable) { // if the cheat engine is disabled, we're done if (!machine().options().cheat()) return; // if we're enabled currently and we don't want to be, turn things off if (!m_disabled && !enable) { // iterate over running cheats and execute any OFF Scripts for (cheat_entry *cheat = m_cheatlist.first(); cheat != NULL; cheat = cheat->next()) if (cheat->state() == SCRIPT_STATE_RUN) cheat->execute_off_script(); popmessage("Cheats Disabled"); m_disabled = true; } // if we're disabled currently and we want to be enabled, turn things on else if (m_disabled && enable) { // iterate over running cheats and execute any ON Scripts m_disabled = false; for (cheat_entry *cheat = m_cheatlist.first(); cheat != NULL; cheat = cheat->next()) if (cheat->state() == SCRIPT_STATE_RUN) cheat->execute_on_script(); popmessage("Cheats Enabled"); } } //------------------------------------------------- // reload - re-initialize the cheat engine, and // and reload the cheat file(s) //------------------------------------------------- void cheat_manager::reload() { // if the cheat engine is disabled, we're done if (!machine().options().cheat()) return; // free everything m_cheatlist.reset(); // reset state m_framecount = 0; m_numlines = 0; m_lastline = 0; m_disabled = false; // load the cheat file, MESS will load a crc32.xml ( eg. 01234567.xml ) // and MAME will load gamename.xml image_interface_iterator iter(machine().root_device()); for (device_image_interface *image = iter.first(); image != NULL; image = iter.next()) if (image->exists()) { // if we are loading through software lists, try to load shortname.xml if (image->software_entry() != NULL) { load_cheats(image->basename()); break; } else { UINT32 crc = image->crc(); if (crc != 0) { astring filename; filename.printf("%08X", crc); load_cheats(filename); break; } } } // if we haven't found the cheats yet, load by basename if (m_cheatlist.count() == 0) load_cheats(machine().basename()); // temporary: save the file back out as output.xml for comparison if (m_cheatlist.count() != 0) save_all("output"); } //------------------------------------------------- // cheat_list_save - save a cheat file from // memory to the given filename //------------------------------------------------- bool cheat_manager::save_all(const char *filename) { // open the file with the proper name emu_file cheatfile(machine().options().cheat_path(), OPEN_FLAG_WRITE | OPEN_FLAG_CREATE | OPEN_FLAG_CREATE_PATHS); file_error filerr = cheatfile.open(filename, ".xml"); // if that failed, return nothing if (filerr != FILERR_NONE) return false; // wrap the rest of catch errors try { // output the outer layers cheatfile.printf("\n"); cheatfile.printf("\n"); cheatfile.printf("\n", CHEAT_VERSION); // iterate over cheats in the list and save them for (cheat_entry *cheat = m_cheatlist.first(); cheat != NULL; cheat = cheat->next()) cheat->save(cheatfile); // close out the file cheatfile.printf("\n"); return true; } // catch errors and cleanup catch (emu_fatalerror &err) { mame_printf_error("%s\n", err.string()); cheatfile.remove_on_close(); } return false; } //------------------------------------------------- // render_text - called by the UI system to // render text //------------------------------------------------- void cheat_manager::render_text(render_container &container) { // render any text and free it along the way for (int linenum = 0; linenum < ARRAY_LENGTH(m_output); linenum++) if (m_output[linenum]) { // output the text ui_draw_text_full(&container, m_output[linenum], 0.0f, (float)linenum * ui_get_line_height(machine()), 1.0f, m_justify[linenum], WRAP_NEVER, DRAW_OPAQUE, ARGB_WHITE, ARGB_BLACK, NULL, NULL); } } //------------------------------------------------- // get_output_astring - return a reference to // the given row's string, and set the // justification //------------------------------------------------- astring &cheat_manager::get_output_astring(int row, int justify) { // if the row is not specified, grab the next one if (row == 0) row = (m_lastline >= 0) ? m_lastline + 1 : m_lastline - 1; // remember the last request m_lastline = row; // invert if negative row = (row < 0) ? m_numlines + row : row - 1; // clamp within range row = MAX(row, 0); row = MIN(row, m_numlines - 1); // return the appropriate string m_justify[row] = justify; return m_output[row]; } //------------------------------------------------- // quote_expression - quote an expression // string so that it is valid to embed in an XML // document //------------------------------------------------- const char *cheat_manager::quote_expression(astring &string, const parsed_expression &expression) { string.cpy(expression.original_string()); string.replace(0, " && ", " and "); string.replace(0, " &&", " and "); string.replace(0, "&& ", " and "); string.replace(0, "&&", " and "); string.replace(0, " & ", " band "); string.replace(0, " &", " band "); string.replace(0, "& ", " band "); string.replace(0, "&", " band "); string.replace(0, " <= ", " le "); string.replace(0, " <=", " le "); string.replace(0, "<= ", " le "); string.replace(0, "<=", " le "); string.replace(0, " < ", " lt "); string.replace(0, " <", " lt "); string.replace(0, "< ", " lt "); string.replace(0, "<", " lt "); string.replace(0, " << ", " lshift "); string.replace(0, " <<", " lshift "); string.replace(0, "<< ", " lshift "); string.replace(0, "<<", " lshift "); return string; } //------------------------------------------------- // execute_frombcd - convert a value from BCD //------------------------------------------------- UINT64 cheat_manager::execute_frombcd(symbol_table &table, void *ref, int params, const UINT64 *param) { UINT64 value = param[0]; UINT64 multiplier = 1; UINT64 result = 0; while (value != 0) { result += (value & 0x0f) * multiplier; value >>= 4; multiplier *= 10; } return result; } //------------------------------------------------- // execute_tobcd - convert a value to BCD //------------------------------------------------- UINT64 cheat_manager::execute_tobcd(symbol_table &table, void *ref, int params, const UINT64 *param) { UINT64 value = param[0]; UINT64 result = 0; UINT8 shift = 0; while (value != 0) { result += (value % 10) << shift; value /= 10; shift += 4; } return result; } //------------------------------------------------- // frame_update - per-frame callback //------------------------------------------------- void cheat_manager::frame_update() { // set up for accumulating output m_lastline = 0; m_numlines = floor(1.0f / ui_get_line_height(machine())); m_numlines = MIN(m_numlines, ARRAY_LENGTH(m_output)); for (int linenum = 0; linenum < ARRAY_LENGTH(m_output); linenum++) m_output[linenum].reset(); // iterate over running cheats and execute them for (cheat_entry *cheat = m_cheatlist.first(); cheat != NULL; cheat = cheat->next()) cheat->frame_update(); // increment the frame counter m_framecount++; } //------------------------------------------------- // load_cheats - load a cheat file into memory // and create the cheat entry list //------------------------------------------------- void cheat_manager::load_cheats(const char *filename) { xml_data_node *rootnode = NULL; emu_file cheatfile(machine().options().cheat_path(), OPEN_FLAG_READ); try { // open the file with the proper name file_error filerr = cheatfile.open(filename, ".xml"); // loop over all instrances of the files found in our search paths while (filerr == FILERR_NONE) { mame_printf_verbose("Loading cheats file from %s\n", cheatfile.fullpath()); // read the XML file into internal data structures xml_parse_options options = { 0 }; xml_parse_error error; options.error = &error; rootnode = xml_file_read(cheatfile, &options); // if unable to parse the file, just bail if (rootnode == NULL) throw emu_fatalerror("%s.xml(%d): error parsing XML (%s)\n", filename, error.error_line, error.error_message); // find the layout node xml_data_node *mamecheatnode = xml_get_sibling(rootnode->child, "mamecheat"); if (mamecheatnode == NULL) throw emu_fatalerror("%s.xml: missing mamecheatnode node", filename); // validate the config data version int version = xml_get_attribute_int(mamecheatnode, "version", 0); if (version != CHEAT_VERSION) throw emu_fatalerror("%s.xml(%d): Invalid cheat XML file: unsupported version", filename, mamecheatnode->line); // parse all the elements for (xml_data_node *cheatnode = xml_get_sibling(mamecheatnode->child, "cheat"); cheatnode != NULL; cheatnode = xml_get_sibling(cheatnode->next, "cheat")) { // load this entry cheat_entry *curcheat = auto_alloc(machine(), cheat_entry(*this, m_symtable, filename, *cheatnode)); // make sure we're not a duplicate cheat_entry *scannode = NULL; if (REMOVE_DUPLICATE_CHEATS) for (scannode = m_cheatlist.first(); scannode != NULL; scannode = scannode->next()) if (strcmp(scannode->description(), curcheat->description()) == 0) { mame_printf_verbose("Ignoring duplicate cheat '%s' from file %s\n", curcheat->description(), cheatfile.fullpath()); break; } // add to the end of the list if (scannode == NULL) m_cheatlist.append(*curcheat); else auto_free(machine(), curcheat); } // free the file and loop for the next one xml_file_free(rootnode); // open the next file in sequence filerr = cheatfile.open_next(); } } // handle errors cleanly catch (emu_fatalerror &err) { mame_printf_error("%s\n", err.string()); m_cheatlist.reset(); if (rootnode != NULL) xml_file_free(rootnode); } }