1/*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26#include "jni.h"
27#include "jni_util.h"
28
29extern jfieldID IO_fd_fdID;
30extern jfieldID IO_handle_fdID;
31extern jfieldID IO_append_fdID;
32
33#ifdef _ALLBSD_SOURCE
34#include <fcntl.h>
35#ifndef O_SYNC
36#define O_SYNC O_FSYNC
37#endif
38#ifndef O_DSYNC
39#define O_DSYNC O_FSYNC
40#endif
41#elif !defined(O_DSYNC) || !defined(O_SYNC)
42#define O_SYNC (0x0800)
43#define O_DSYNC (0x2000)
44#endif
45
46/*
47 * IO helper functions
48 */
49
50jint readSingle(JNIEnv *env, jobject this, jfieldID fid);
51jint readBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,
52 jint len, jfieldID fid);
53void writeSingle(JNIEnv *env, jobject this, jint byte, jboolean append, jfieldID fid);
54void writeBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,
55 jint len, jboolean append, jfieldID fid);
56void fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags);
57void throwFileNotFoundException(JNIEnv *env, jstring path);
58
59/*
60 * Macros for managing platform strings. The typical usage pattern is:
61 *
62 * WITH_PLATFORM_STRING(env, string, var) {
63 * doSomethingWith(var);
64 * } END_PLATFORM_STRING(env, var);
65 *
66 * where env is the prevailing JNIEnv,
67 * string is a JNI reference to a java.lang.String object, and
68 * var is the char * variable that will point to the string,
69 * after being converted into the platform encoding.
70 *
71 * The related macro WITH_FIELD_PLATFORM_STRING first extracts the string from
72 * a given field of a given object:
73 *
74 * WITH_FIELD_PLATFORM_STRING(env, object, id, var) {
75 * doSomethingWith(var);
76 * } END_PLATFORM_STRING(env, var);
77 *
78 * where env is the prevailing JNIEnv,
79 * object is a jobject,
80 * id is the field ID of the String field to be extracted, and
81 * var is the char * variable that will point to the string.
82 *
83 * Uses of these macros may be nested as long as each WITH_.._STRING macro
84 * declares a unique variable.
85 */
86
87#define WITH_PLATFORM_STRING(env, strexp, var) \
88 if (1) { \
89 const char *var; \
90 jstring _##var##str = (strexp); \
91 if (_##var##str == NULL) { \
92 JNU_ThrowNullPointerException((env), NULL); \
93 goto _##var##end; \
94 } \
95 var = JNU_GetStringPlatformChars((env), _##var##str, NULL); \
96 if (var == NULL) goto _##var##end;
97
98#define WITH_FIELD_PLATFORM_STRING(env, object, id, var) \
99 WITH_PLATFORM_STRING(env, \
100 ((object == NULL) \
101 ? NULL \
102 : (*(env))->GetObjectField((env), (object), (id))), \
103 var)
104
105#define END_PLATFORM_STRING(env, var) \
106 JNU_ReleaseStringPlatformChars(env, _##var##str, var); \
107 _##var##end: ; \
108 } else ((void)NULL)
109
110
111/* Macros for transforming Java Strings into native Unicode strings.
112 * Works analogously to WITH_PLATFORM_STRING.
113 */
114
115#define WITH_UNICODE_STRING(env, strexp, var) \
116 if (1) { \
117 const jchar *var; \
118 jstring _##var##str = (strexp); \
119 if (_##var##str == NULL) { \
120 JNU_ThrowNullPointerException((env), NULL); \
121 goto _##var##end; \
122 } \
123 var = (*(env))->GetStringChars((env), _##var##str, NULL); \
124 if (var == NULL) goto _##var##end;
125
126#define END_UNICODE_STRING(env, var) \
127 (*(env))->ReleaseStringChars(env, _##var##str, var); \
128 _##var##end: ; \
129 } else ((void)NULL)
130