/*

 * Copyright (c) 1997, 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 "jni.h"

#include "jni_util.h"

extern jfieldID IO_fd_fdID;

extern jfieldID IO_handle_fdID;

#ifdef _ALLBSD_SOURCE

#include <fcntl.h>

#ifndef O_SYNC

#define O_SYNC  O_FSYNC

#endif

#ifndef O_DSYNC

#define O_DSYNC O_FSYNC

#endif

#elif !defined(O_DSYNC) || !defined(O_SYNC)

#define O_SYNC  (0x0800)

#define O_DSYNC (0x2000)

#endif

/*

 * IO helper functions

 */

jint readSingle(JNIEnv *env, jobject this, jfieldID fid);

jint readBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,

               jint len, jfieldID fid);

void writeSingle(JNIEnv *env, jobject this, jint byte, jboolean append, jfieldID fid);

void writeBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,

                jint len, jboolean append, jfieldID fid);

void fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags);

void throwFileNotFoundException(JNIEnv *env, jstring path);

/*

 * Macros for managing platform strings.  The typical usage pattern is:

 *

 *     WITH_PLATFORM_STRING(env, string, var) {

 *         doSomethingWith(var);

 *     } END_PLATFORM_STRING(env, var);

 *

 *  where  env      is the prevailing JNIEnv,

 *         string   is a JNI reference to a java.lang.String object, and

 *         var      is the char * variable that will point to the string,

 *                  after being converted into the platform encoding.

 *

 * The related macro WITH_FIELD_PLATFORM_STRING first extracts the string from

 * a given field of a given object:

 *

 *     WITH_FIELD_PLATFORM_STRING(env, object, id, var) {

 *         doSomethingWith(var);

 *     } END_PLATFORM_STRING(env, var);

 *

 *  where  env      is the prevailing JNIEnv,

 *         object   is a jobject,

 *         id       is the field ID of the String field to be extracted, and

 *         var      is the char * variable that will point to the string.

 *

 * Uses of these macros may be nested as long as each WITH_.._STRING macro

 * declares a unique variable.

 */

#define WITH_PLATFORM_STRING(env, strexp, var)                                \

    if (1) {                                                                  \

        const char *var;                                                      \

        jstring _##var##str = (strexp);                                       \

        if (_##var##str == NULL) {                                            \

            JNU_ThrowNullPointerException((env), NULL);                       \

            goto _##var##end;                                                 \

        }                                                                     \

        var = JNU_GetStringPlatformChars((env), _##var##str, NULL);           \

        if (var == NULL) goto _##var##end;

#define WITH_FIELD_PLATFORM_STRING(env, object, id, var)                      \

    WITH_PLATFORM_STRING(env,                                                 \

                         ((object == NULL)                                    \

                          ? NULL                                              \

                          : (*(env))->GetObjectField((env), (object), (id))), \

                         var)

#define END_PLATFORM_STRING(env, var)                                         \

        JNU_ReleaseStringPlatformChars(env, _##var##str, var);                \

    _##var##end: ;                                                            \

    } else ((void)NULL)

/* Macros for transforming Java Strings into native Unicode strings.

 * Works analogously to WITH_PLATFORM_STRING.

 */

#define WITH_UNICODE_STRING(env, strexp, var)                                 \

    if (1) {                                                                  \

        const jchar *var;                                                     \

        jstring _##var##str = (strexp);                                       \

        if (_##var##str == NULL) {                                            \

            JNU_ThrowNullPointerException((env), NULL);                       \

            goto _##var##end;                                                 \

        }                                                                     \

        var = (*(env))->GetStringChars((env), _##var##str, NULL);             \

        if (var == NULL) goto _##var##end;

#define END_UNICODE_STRING(env, var)                                          \

        (*(env))->ReleaseStringChars(env, _##var##str, var);                  \

    _##var##end: ;                                                            \

    } else ((void)NULL)