/*

 * Copyright (c) 2004, 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 <stdlib.h>

#include <string.h>

#include <windows.h>

#include <locale.h>

#include "jni.h"

#include "jni_util.h"

static void getParent(const TCHAR *path, TCHAR *dest) {

    char* lastSlash = max(strrchr(path, '\\'), strrchr(path, '/'));

    if (lastSlash == NULL) {

        *dest = 0;

        return;

    }

    if (path != dest)

        strcpy(dest, path);

    *lastSlash = 0;

}

void* getProcessHandle() {

    return (void*)GetModuleHandle(NULL);

}

/*

 * Windows symbols can be simple like JNI_OnLoad or __stdcall format

 * like _JNI_OnLoad@8. We need to handle both.

 */

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

                          char *jniEntryName) {

    if (cname != NULL) {

        char *p = strrchr(sym, '@');

        if (p != NULL && p != sym) {

            // sym == _JNI_OnLoad@8

            strncpy(jniEntryName, sym, (p - sym));

            jniEntryName[(p-sym)] = '\0';

            // jniEntryName == _JNI_OnLoad

            strcat(jniEntryName, "_");

            strcat(jniEntryName, cname);

            strcat(jniEntryName, p);

            //jniEntryName == _JNI_OnLoad_cname@8

        } else {

            strcpy(jniEntryName, sym);

            strcat(jniEntryName, "_");

            strcat(jniEntryName, cname);

        }

    } else {

        strcpy(jniEntryName, sym);

    }

    return;

}

size_t

getLastErrorString(char *utf8_jvmErrorMsg, size_t cbErrorMsg)

{

    size_t n = 0;

    if (cbErrorMsg > 0) {

        BOOLEAN noError = FALSE;

        WCHAR *utf16_osErrorMsg = (WCHAR *)malloc(cbErrorMsg*sizeof(WCHAR));

        if (utf16_osErrorMsg == NULL) {

            // OOM accident

            strncpy(utf8_jvmErrorMsg, "Out of memory", cbErrorMsg);

            // truncate if too long

            utf8_jvmErrorMsg[cbErrorMsg - 1] = '\0';

            n = strlen(utf8_jvmErrorMsg);

        } else {

            DWORD errval = GetLastError();

            if (errval != 0) {

                // WIN32 error

                n = (size_t)FormatMessageW(

                    FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,

                    NULL,

                    errval,

                    0,

                    utf16_osErrorMsg,

                    (DWORD)cbErrorMsg,

                    NULL);

                if (n > 3) {

                    // Drop final '.', CR, LF

                    if (utf16_osErrorMsg[n - 1] == L'\n') --n;

                    if (utf16_osErrorMsg[n - 1] == L'\r') --n;

                    if (utf16_osErrorMsg[n - 1] == L'.') --n;

                    utf16_osErrorMsg[n] = L'\0';

                }

            } else if (errno != 0) {

                // C runtime error that has no corresponding WIN32 error code

                int ret = _wcserror_s(utf16_osErrorMsg, cbErrorMsg, errno);

                if (ret == 0)

                    n = wcslen(utf16_osErrorMsg);

            } else

                noError = TRUE; //OS has no error to report

            if (!noError) {

                if (n > 0) {

                    n = WideCharToMultiByte(

                        CP_UTF8,

                        0,

                        utf16_osErrorMsg,

                        (int)n,

                        utf8_jvmErrorMsg,

                        (int)cbErrorMsg,

                        NULL,

                        NULL);

                    // no way to die

                    if (n > 0)

                        utf8_jvmErrorMsg[min(cbErrorMsg - 1, n)] = '\0';

                }

                if (n <= 0) {

                    strncpy(utf8_jvmErrorMsg, "Secondary error while OS message extraction", cbErrorMsg);

                    // truncate if too long

                    utf8_jvmErrorMsg[cbErrorMsg - 1] = '\0';

                    n = strlen(utf8_jvmErrorMsg);

                }

            }

            free(utf16_osErrorMsg);

        }

    }

    return n;

}

int

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

{

    int ret = 0;

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

    ret = strerror_s(buf, len, err);

    return ret;

}