halflife-thewastes-sdk/common/interface.cpp

151 lines
3.3 KiB
C++

//========= Copyright © 1996-2001, Valve LLC, All rights reserved. ============
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "interface.h"
#ifndef _WIN32 // LINUX
#include <unistd.h>
#include <dlfcn.h>
#endif
// ------------------------------------------------------------------------------------ //
// InterfaceReg.
// ------------------------------------------------------------------------------------ //
InterfaceReg *InterfaceReg::s_pInterfaceRegs = NULL;
InterfaceReg::InterfaceReg( InstantiateInterfaceFn fn, const char *pName ) :
m_pName(pName)
{
m_CreateFn = fn;
m_pNext = s_pInterfaceRegs;
s_pInterfaceRegs = this;
}
// ------------------------------------------------------------------------------------ //
// CreateInterface.
// ------------------------------------------------------------------------------------ //
EXPORT_FUNCTION IBaseInterface *CreateInterface( const char *pName, int *pReturnCode )
{
InterfaceReg *pCur;
for(pCur=InterfaceReg::s_pInterfaceRegs; pCur; pCur=pCur->m_pNext)
{
if(strcmp(pCur->m_pName, pName) == 0)
{
if ( pReturnCode )
{
*pReturnCode = IFACE_OK;
}
return pCur->m_CreateFn();
}
}
if ( pReturnCode )
{
*pReturnCode = IFACE_FAILED;
}
return NULL;
}
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include "windows.h"
#endif
#ifdef _WIN32
HINTERFACEMODULE Sys_LoadModule(const char *pModuleName)
{
return (HINTERFACEMODULE)LoadLibrary(pModuleName);
}
#else // LINUX
HINTERFACEMODULE Sys_LoadModule(const char *pModuleName)
{
// Linux dlopen() doesn't look in the current directory for libraries.
// We tell it to, so people don't have to 'install' libraries as root.
char szCwd[1024];
char szAbsoluteLibFilename[1024];
getcwd( szCwd, sizeof( szCwd ) );
if ( szCwd[ strlen( szCwd ) - 1 ] == '/' )
szCwd[ strlen( szCwd ) - 1 ] = 0;
sprintf( szAbsoluteLibFilename, "%s/%s", szCwd, pModuleName );
return (HINTERFACEMODULE)dlopen( szAbsoluteLibFilename, RTLD_NOW );
}
#endif
#ifdef _WIN32
void Sys_FreeModule(HINTERFACEMODULE hModule)
{
if(!hModule)
return;
FreeLibrary((HMODULE)hModule);
}
#else // LINUX
void Sys_FreeModule(HINTERFACEMODULE hModule)
{
if(!hModule)
return;
dlclose( (void *)hModule );
}
#endif
//-----------------------------------------------------------------------------
// Purpose: returns the instance of this module
// Output : interface_instance_t
//-----------------------------------------------------------------------------
CreateInterfaceFn Sys_GetFactoryThis( void )
{
return CreateInterface;
}
//-----------------------------------------------------------------------------
// Purpose: returns the instance of the named module
// Input : *pModuleName - name of the module
// Output : interface_instance_t - instance of that module
//-----------------------------------------------------------------------------
#ifdef _WIN32
CreateInterfaceFn Sys_GetFactory( HINTERFACEMODULE hModule )
{
if(!hModule)
return NULL;
return (CreateInterfaceFn)GetProcAddress((HMODULE)hModule, CREATEINTERFACE_PROCNAME);
}
#else // LINUX
CreateInterfaceFn Sys_GetFactory( HINTERFACEMODULE hModule )
{
if(!hModule)
return NULL;
return (CreateInterfaceFn)dlsym( (void *)hModule, CREATEINTERFACE_PROCNAME );
}
#endif