/*

 * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include <errno.h>

#include <string.h>

#include "jni.h"

#include "jni_util.h"

#include "dlfcn.h"

#if defined(LINUX) && (defined(_GNU_SOURCE) || \

         (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE < 200112L \

             && defined(_XOPEN_SOURCE) && _XOPEN_SOURCE < 600))

extern int __xpg_strerror_r(int, char *, size_t);

#define strerror_r(a, b, c) __xpg_strerror_r((a), (b), (c))

#endif

    static void *procHandle = NULL;

    if (procHandle != NULL) {

        return procHandle;

    }

#ifdef __APPLE__

    procHandle = (void*)dlopen(NULL, RTLD_FIRST);

#else

    procHandle = (void*)dlopen(NULL, RTLD_LAZY);

#endif

    return procHandle;

}

void buildJniFunctionName(const char *sym, const char *cname,

                          char *jniEntryName) {

    strcpy(jniEntryName, sym);

    if (cname != NULL) {

        strcat(jniEntryName, "_");

        strcat(jniEntryName, cname);

    }

}

size_t

getLastErrorString(char *buf, size_t len)

{

    if (errno == 0 || len < 1) return 0;

    getErrorString(errno, buf, len);

    return strlen(buf);

}

int

getErrorString(int err, char *buf, size_t len)

{

    if (err == 0 || len < 1) return 0;

    return strerror_r(err, buf, len);

}