/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */


#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <dlfcn.h>

/*
 * NOTE: Since no one is really interested in correct unload behavior I've
 * disabled the shared library unload check. If you want to reenable it comment
 * the following line out
 */
#define NO_UNLOAD_CHECK

static const char *pprog_name   = "checkdll";
static const char *psymbol      = "GetVersionInfo";

void usage()
{
    fprintf(stderr, "usage: %s [-s] <dllname>\n", pprog_name);
    return;
}

int main(int argc, char *argv[])
{
    int     silent=0;
    void    *phandle;
    char    *(*pfun)(void);

    if ( argc < 2 || argc > 4) {
        usage();
        return 1;
    }

    if ( !strcmp(argv[1],"-s") ) {
        silent = 1;
        ++argv, --argc;
    }

    if ( access( argv[1], R_OK ) == -1 ) {
        fprintf(stderr, "%s: ERROR: %s: %s\n",
                pprog_name, argv[1], strerror(errno));
        return 2;
    }

    if (!silent) printf("Checking DLL %s ...", argv[1]);
    fflush(stdout);

    if ( (phandle = dlopen(argv[1], RTLD_NOW)) != NULL ) {
        if  ( (pfun = (char *(*)(void))dlsym(phandle, psymbol)) != NULL ) {
            if (!silent) printf(": ok\n");
        }
        else
        {
            printf(": WARNING: %s\n", dlerror());
        }
#ifdef NO_UNLOAD_CHECK
        _exit(0);
#else
        dlclose(phandle);
#endif
        return 0;
    }

    printf(": ERROR: %s\n", dlerror());
    return 3;
}


/* vim:set shiftwidth=4 softtabstop=4 expandtab: */