/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved.             */
/* Copyright (c) 2005-2014 Rexx Language Association. All rights reserved.    */
/*                                                                            */
/* This program and the accompanying materials are made available under       */
/* the terms of the Common Public License v1.0 which accompanies this         */
/* distribution. A copy is also available at the following address:           */
/* https://www.oorexx.org/license.html                                        */
/*                                                                            */
/* Redistribution and use in source and binary forms, with or                 */
/* without modification, are permitted provided that the following            */
/* conditions are met:                                                        */
/*                                                                            */
/* Redistributions of source code must retain the above copyright             */
/* notice, this list of conditions and the following disclaimer.              */
/* Redistributions in binary form must reproduce the above copyright          */
/* notice, this list of conditions and the following disclaimer in            */
/* the documentation and/or other materials provided with the distribution.   */
/*                                                                            */
/* Neither the name of Rexx Language Association nor the names                */
/* of its contributors may be used to endorse or promote products             */
/* derived from this software without specific prior written permission.      */
/*                                                                            */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS        */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT          */
/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS          */
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/*                                                                            */
/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Shared runtime                                                        */
/*                                                                            */
/* Windows implementation of the SysLibrary                                   */
/*                                                                            */
/******************************************************************************/

#include "SysLibrary.hpp"

SysLibrary::SysLibrary()
{
    libraryHandle = NULL;
}


void *SysLibrary::getProcedure(
  const char *name)                      /* required procedure name           */
/******************************************************************************/
/* Function:  Resolve a named procedure in a library                          */
/******************************************************************************/
{
  return (void *)GetProcAddress(libraryHandle, name);
}


/**
 * Load a named library in this process.
 *
 * @param name   Character string name of the library.
 *
 * @return True if able to load the library ok, false otherwise.
 */
bool SysLibrary::load(const char *name)
{
    if (libraryHandle == NULL)
    {
        // we always use LoadLibrary to load this, to bump the reference count on
        // the module if it is already loaded in this process.
        libraryHandle = LoadLibrary((LPCTSTR)name);
        // and return the success/failure indicator
        return libraryHandle != NULL;

    }
    return true;
}

/**
 * Free a loaded library if the library is still loaded.
 *
 * @return True if we unloaded ok, false otherwise.
 */
bool SysLibrary::unload()
{
    if (libraryHandle != NULL)
    {
        return FreeLibrary(libraryHandle) != FALSE;
    }
    return false;
}
