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108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
/*
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** i_module.cpp
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**
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**---------------------------------------------------------------------------
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** Copyright 2016 Braden Obrzut
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include "i_module.h"
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#ifdef _WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#else
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#include <dlfcn.h>
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#endif
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#ifndef _WIN32
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#define LoadLibraryA(x) dlopen((x), RTLD_LAZY)
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#define GetProcAddress(a,b) dlsym((a),(b))
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#define FreeLibrary(x) dlclose((x))
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using HMODULE = void*;
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#endif
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bool FModule::Load(std::initializer_list<const char*> libnames)
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{
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for(auto lib : libnames)
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{
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if(!Open(lib))
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continue;
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StaticProc *proc;
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for(proc = reqSymbols;proc;proc = proc->Next)
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{
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if(!(proc->Call = GetSym(proc->Name)) && !proc->Optional)
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{
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Unload();
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break;
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}
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}
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if(IsLoaded())
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return true;
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}
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return false;
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}
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void FModule::Unload()
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{
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if(handle)
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{
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FreeLibrary((HMODULE)handle);
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handle = nullptr;
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}
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}
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bool FModule::Open(const char* lib)
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{
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#ifdef _WIN32
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if((handle = GetModuleHandleA(lib)) != nullptr)
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return true;
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#else
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// Loading an empty string in Linux doesn't do what we expect it to.
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if(*lib == '\0')
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return false;
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#endif
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handle = LoadLibraryA(lib);
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return handle != nullptr;
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}
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void *FModule::GetSym(const char* name)
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{
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return (void *)GetProcAddress((HMODULE)handle, name);
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}
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std::string module_progdir("."); // current program directory used to look up dynamic libraries. Default to something harmless in case the user didn't set it.
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void FModule_SetProgDir(const char* progdir)
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{
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module_progdir = progdir;
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}
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