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