mirror of
https://github.com/openjdk/jdk.git
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129 lines
5.7 KiB
C
129 lines
5.7 KiB
C
/*
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "jni.h"
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#include "jni_util.h"
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extern jfieldID IO_fd_fdID;
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extern jfieldID IO_handle_fdID;
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extern jfieldID IO_append_fdID;
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#ifdef _ALLBSD_SOURCE
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#include <fcntl.h>
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#ifndef O_SYNC
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#define O_SYNC O_FSYNC
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#endif
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#ifndef O_DSYNC
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#define O_DSYNC O_FSYNC
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#endif
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#elif !defined(O_DSYNC) || !defined(O_SYNC)
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#define O_SYNC (0x0800)
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#define O_DSYNC (0x2000)
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#endif
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/*
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* IO helper functions
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*/
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jint readSingle(JNIEnv *env, jobject this, jfieldID fid);
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jint readBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,
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jint len, jfieldID fid);
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void writeSingle(JNIEnv *env, jobject this, jint byte, jboolean append, jfieldID fid);
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void writeBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,
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jint len, jboolean append, jfieldID fid);
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void fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags);
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void throwFileNotFoundException(JNIEnv *env, jstring path);
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/*
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* Macros for managing platform strings. The typical usage pattern is:
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*
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* WITH_PLATFORM_STRING(env, string, var) {
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* doSomethingWith(var);
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* } END_PLATFORM_STRING(env, var);
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*
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* where env is the prevailing JNIEnv,
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* string is a JNI reference to a java.lang.String object, and
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* var is the char * variable that will point to the string,
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* after being converted into the platform encoding.
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*
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* The related macro WITH_FIELD_PLATFORM_STRING first extracts the string from
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* a given field of a given object:
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*
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* WITH_FIELD_PLATFORM_STRING(env, object, id, var) {
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* doSomethingWith(var);
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* } END_PLATFORM_STRING(env, var);
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*
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* where env is the prevailing JNIEnv,
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* object is a jobject,
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* id is the field ID of the String field to be extracted, and
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* var is the char * variable that will point to the string.
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*
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* Uses of these macros may be nested as long as each WITH_.._STRING macro
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* declares a unique variable.
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*/
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#define WITH_PLATFORM_STRING(env, strexp, var) \
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if (1) { \
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const char *var; \
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jstring _##var##str = (strexp); \
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if (_##var##str == NULL) { \
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JNU_ThrowNullPointerException((env), NULL); \
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goto _##var##end; \
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} \
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var = JNU_GetStringPlatformChars((env), _##var##str, NULL); \
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if (var == NULL) goto _##var##end;
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#define WITH_FIELD_PLATFORM_STRING(env, object, id, var) \
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WITH_PLATFORM_STRING(env, \
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((object == NULL) \
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? NULL \
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: (*(env))->GetObjectField((env), (object), (id))), \
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var)
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#define END_PLATFORM_STRING(env, var) \
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JNU_ReleaseStringPlatformChars(env, _##var##str, var); \
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_##var##end: ; \
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} else ((void)NULL)
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/* Macros for transforming Java Strings into native Unicode strings.
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* Works analogously to WITH_PLATFORM_STRING.
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*/
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#define WITH_UNICODE_STRING(env, strexp, var) \
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if (1) { \
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const jchar *var; \
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jstring _##var##str = (strexp); \
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if (_##var##str == NULL) { \
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JNU_ThrowNullPointerException((env), NULL); \
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goto _##var##end; \
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} \
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var = (*(env))->GetStringChars((env), _##var##str, NULL); \
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if (var == NULL) goto _##var##end;
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#define END_UNICODE_STRING(env, var) \
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(*(env))->ReleaseStringChars(env, _##var##str, var); \
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_##var##end: ; \
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} else ((void)NULL)
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