/****************************************************************************
** $Id: qt/qlibrary_unix.cpp   3.1.2   edited Nov 7 16:55 $
**
** Implementation of QLibraryPrivate class
**
** Created : 000101
**
** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
**
** This file is part of the tools module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
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**********************************************************************/

#include "qplatformdefs.h"
#include "private/qlibrary_p.h"

#ifndef QT_NO_LIBRARY

#if defined(QT_AOUT_UNDERSCORE)
#include <string.h>
#endif

/*
  The platform dependent implementations of
  - loadLibrary
  - freeLibrary
  - resolveSymbol

  It's not too hard to guess what the functions do.
*/

#if defined(Q_OS_MAC)

bool QLibraryPrivate::loadLibrary()
{
    return FALSE;
}

bool QLibraryPrivate::freeLibrary()
{
    return FALSE;
}

void* QLibraryPrivate::resolveSymbol( const char* )
{
    return 0;
}

#elif defined(QT_HPUX_LD) // for HP-UX < 11.x and 32 bit

bool QLibraryPrivate::loadLibrary()
{
    if ( pHnd )
	return TRUE;

    QString filename = library->library();

    pHnd = (void*)shl_load( filename.latin1(), BIND_DEFERRED | BIND_NONFATAL | DYNAMIC_PATH, 0 );
#if defined(QT_DEBUG) || defined(QT_DEBUG_COMPONENT)
    if ( !pHnd )
	qWarning( "%s: failed to load library!", filename.latin1() );
#endif
    return pHnd != 0;
}

bool QLibraryPrivate::freeLibrary()
{
    if ( !pHnd )
	return TRUE;

    if ( shl_unload( (shl_t)pHnd ) ) {
#if defined(QT_DEBUG) || defined(QT_DEBUG_COMPONENT)
	QString filename = library->library();
	qWarning( "%s: Failed to unload library!", filename.latin1() );
#endif
	return FALSE;
    }
    pHnd = 0;
    return TRUE;
}

void* QLibraryPrivate::resolveSymbol( const char* symbol )
{
    if ( !pHnd )
	return 0;

    void* address = 0;
    if ( shl_findsym( (shl_t*)&pHnd, symbol, TYPE_UNDEFINED, &address ) < 0 ) {
#if defined(QT_DEBUG_COMPONENT)
	QString filename = library->library();
	qWarning( "%s: couldn't resolve symbol \"%s\"", filename.latin1(), symbol );
#endif
    }
    return address;
}

#else // POSIX
#include <dlfcn.h>

bool QLibraryPrivate::loadLibrary()
{
    if ( pHnd )
	return TRUE;

    QString filename = library->library();

    pHnd = dlopen( filename.latin1(), RTLD_LAZY );
#if defined(QT_DEBUG) || defined(QT_DEBUG_COMPONENT)
    if ( !pHnd )
	qWarning( "%s", dlerror() );
#endif
    return pHnd != 0;
}

bool QLibraryPrivate::freeLibrary()
{
    if ( !pHnd )
	return TRUE;

    if ( dlclose( pHnd ) ) {
#if defined(QT_DEBUG) || defined(QT_DEBUG_COMPONENT)
	qWarning( "%s", dlerror() );
#endif
	return FALSE;
    }

    pHnd = 0;
    return TRUE;
}

void* QLibraryPrivate::resolveSymbol( const char* symbol )
{
    if ( !pHnd )
	return 0;

#if defined(QT_AOUT_UNDERSCORE)
    // older a.out systems add an underscore in front of symbols
    char* undrscr_symbol = new char[strlen(symbol)+2];
    undrscr_symbol[0] = '_';
    strcpy(undrscr_symbol+1, symbol);
    void* address = dlsym( pHnd, undrscr_symbol );
    delete [] undrscr_symbol;
#else
    void* address = dlsym( pHnd, symbol );
#endif
#if defined(QT_DEBUG_COMPONENT)
    const char* error = dlerror();
    if ( error )
	qWarning( "%s", error );
#endif
    return address;
}

#endif // POSIX

#endif
