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/* Copyright (C) 2021 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "precompiled.h"
#include "lib/app_hooks.h"
#include "lib/sysdep/sysdep.h"
#include <cstdio>
//-----------------------------------------------------------------------------
// default implementations
//-----------------------------------------------------------------------------
static const OsPath& def_get_log_dir()
{
static OsPath logDir;
if(logDir.empty())
logDir = sys_ExecutablePathname().Parent();
return logDir;
}
static void def_bundle_logs(FILE* UNUSED(f))
{
}
static ErrorReactionInternal def_display_error(const wchar_t* UNUSED(text), size_t UNUSED(flags))
{
return ERI_NOT_IMPLEMENTED;
}
//-----------------------------------------------------------------------------
// contains the current set of hooks. starts with the default values and
// may be changed via app_hooks_update.
//
// rationale: we don't ever need to switch "hook sets", so one global struct
// is fine. by always having one defined, we also avoid the trampolines
// having to check whether their function pointer is valid.
static AppHooks ah =
{
def_get_log_dir,
def_bundle_logs,
def_display_error
};
// separate copy of ah; used to determine if a particular hook has been
// redefined. the additional storage needed is negligible and this is
// easier than comparing each value against its corresponding def_ value.
static AppHooks default_ah = ah;
// register the specified hook function pointers. any of them that
// are non-zero override the previous function pointer value
// (these default to the stub hooks which are functional but basic).
void app_hooks_update(AppHooks* new_ah)
{
ENSURE(new_ah);
#define OVERRIDE_IF_NONZERO(HOOKNAME) if(new_ah->HOOKNAME) ah.HOOKNAME = new_ah->HOOKNAME;
OVERRIDE_IF_NONZERO(get_log_dir)
OVERRIDE_IF_NONZERO(bundle_logs)
OVERRIDE_IF_NONZERO(display_error)
#undef OVERRIDE_IF_NONZERO
}
bool app_hook_was_redefined(size_t offset_in_struct)
{
const u8* ah_bytes = (const u8*)&ah;
const u8* default_ah_bytes = (const u8*)&default_ah;
typedef void(*FP)(); // a bit safer than comparing void* pointers
if(*(FP)(ah_bytes+offset_in_struct) != *(FP)(default_ah_bytes+offset_in_struct))
return true;
return false;
}
//-----------------------------------------------------------------------------
// trampoline implementations
// (boilerplate code; hides details of how to call the app hook)
//-----------------------------------------------------------------------------
const OsPath& ah_get_log_dir()
{
return ah.get_log_dir();
}
void ah_bundle_logs(FILE* f)
{
ah.bundle_logs(f);
}
ErrorReactionInternal ah_display_error(const wchar_t* text, size_t flags)
{
return ah.display_error(text, flags);
}
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