(svn r15441) -Cleanup: Use a return value instead of passing a pointer to where the result should be stored.
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		@@ -119,20 +119,19 @@ const char *AIFileInfo::GetMainScript()
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	return this->main_script;
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}
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void AIFileInfo::CheckMethods(SQInteger *res, const char *name)
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bool AIFileInfo::CheckMethod(const char *name)
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{
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	if (!this->engine->MethodExists(*this->SQ_instance, name)) {
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		char error[1024];
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		snprintf(error, sizeof(error), "your info.nut/library.nut doesn't have the method '%s'", name);
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		this->engine->ThrowError(error);
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		*res = SQ_ERROR;
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		return false;
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	}
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	return true;
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}
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/* static */ SQInteger AIFileInfo::Constructor(HSQUIRRELVM vm, AIFileInfo *info, bool library)
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{
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	SQInteger res = 0;
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	/* Set some basic info from the parent */
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	info->SQ_instance = MallocT<SQObject>(1);
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	Squirrel::GetInstance(vm, info->SQ_instance, 2);
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@@ -141,20 +140,21 @@ void AIFileInfo::CheckMethods(SQInteger *res, const char *name)
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	info->base = ((AIScanner *)Squirrel::GetGlobalPointer(vm));
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	info->engine = info->base->GetEngine();
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	/* Check if all needed fields are there */
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	info->CheckMethods(&res, "GetAuthor");
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	info->CheckMethods(&res, "GetName");
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	info->CheckMethods(&res, "GetShortName");
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	info->CheckMethods(&res, "GetDescription");
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	info->CheckMethods(&res, "GetVersion");
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	info->CheckMethods(&res, "GetDate");
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	info->CheckMethods(&res, "CreateInstance");
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	if (library) {
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		info->CheckMethods(&res, "GetCategory");
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	static const char * const required_functions[] = {
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		"GetAuthor",
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		"GetName",
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		"GetShortName",
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		"GetDescription",
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		"GetVersion",
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		"GetDate",
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		"CreateInstance",
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	};
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	for (size_t i = 0; i < lengthof(required_functions); i++) {
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		if (!info->CheckMethod(required_functions[i])) return SQ_ERROR;
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	}
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	if (library) {
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		if (!info->CheckMethod("GetCategory")) return SQ_ERROR;
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	}
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	/* Abort if one method was missing */
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	if (res != 0) return res;
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	info->main_script = strdup(info->base->GetMainScript());
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@@ -97,7 +97,7 @@ public:
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	/**
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	 * Check if a given method exists.
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	 */
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	void CheckMethods(SQInteger *res, const char *name);
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	bool CheckMethod(const char *name);
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	/**
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	 * Process the creation of a FileInfo object.
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@@ -56,7 +56,7 @@
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	const IndustrySpec *ins = ::GetIndustrySpec(industry_type);
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	AIList *list = new AIList();
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	for (int i = 0; i < 2; i++) {
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	for (size_t i = 0; i < lengthof(ins->produced_cargo); i++) {
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		if (ins->produced_cargo[i] != CT_INVALID) list->AddItem(ins->produced_cargo[i], 0);
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	}
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@@ -70,7 +70,7 @@
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	const IndustrySpec *ins = ::GetIndustrySpec(industry_type);
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	AIList *list = new AIList();
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	for (int i = 0; i < 3; i++) {
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	for (size_t i = 0; i < lengthof(ins->accepts_cargo); i++) {
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		if (ins->accepts_cargo[i] != CT_INVALID) list->AddItem(ins->accepts_cargo[i], 0);
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	}
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