120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
/*
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* Copyright (c) 2017, 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.
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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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*/
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#ifndef SHARE_VM_UTILITIES_FORMATBUFFER_HPP
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#define SHARE_VM_UTILITIES_FORMATBUFFER_HPP
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#include "jvm.h"
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#include "utilities/globalDefinitions.hpp"
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#include <stdarg.h>
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// Simple class to format the ctor arguments into a fixed-sized buffer.
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class FormatBufferBase {
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protected:
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char* _buf;
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inline FormatBufferBase(char* buf) : _buf(buf) {}
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public:
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static const int BufferSize = 256;
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operator const char *() const { return _buf; }
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};
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// Use resource area for buffer
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class FormatBufferResource : public FormatBufferBase {
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public:
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FormatBufferResource(const char * format, ...) ATTRIBUTE_PRINTF(2, 3);
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};
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class FormatBufferDummy {};
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// Use stack for buffer
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template <size_t bufsz = FormatBufferBase::BufferSize>
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class FormatBuffer : public FormatBufferBase {
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public:
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inline FormatBuffer(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
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// since va_list is unspecified type (can be char*), we use FormatBufferDummy to disambiguate these constructors
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inline FormatBuffer(FormatBufferDummy dummy, const char* format, va_list ap) ATTRIBUTE_PRINTF(3, 0);
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inline void append(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
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inline void print(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);
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inline void printv(const char* format, va_list ap) ATTRIBUTE_PRINTF(2, 0);
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char* buffer() { return _buf; }
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int size() { return bufsz; }
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private:
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FormatBuffer(const FormatBuffer &); // prevent copies
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char _buffer[bufsz];
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protected:
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inline FormatBuffer();
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};
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template <size_t bufsz>
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FormatBuffer<bufsz>::FormatBuffer(const char * format, ...) : FormatBufferBase(_buffer) {
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va_list argp;
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va_start(argp, format);
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jio_vsnprintf(_buf, bufsz, format, argp);
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va_end(argp);
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}
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template <size_t bufsz>
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FormatBuffer<bufsz>::FormatBuffer(FormatBufferDummy dummy, const char * format, va_list ap) : FormatBufferBase(_buffer) {
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jio_vsnprintf(_buf, bufsz, format, ap);
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}
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template <size_t bufsz>
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FormatBuffer<bufsz>::FormatBuffer() : FormatBufferBase(_buffer) {
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_buf[0] = '\0';
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}
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template <size_t bufsz>
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void FormatBuffer<bufsz>::print(const char * format, ...) {
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va_list argp;
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va_start(argp, format);
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jio_vsnprintf(_buf, bufsz, format, argp);
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va_end(argp);
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}
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template <size_t bufsz>
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void FormatBuffer<bufsz>::printv(const char * format, va_list argp) {
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jio_vsnprintf(_buf, bufsz, format, argp);
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}
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template <size_t bufsz>
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void FormatBuffer<bufsz>::append(const char* format, ...) {
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// Given that the constructor does a vsnprintf we can assume that
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// _buf is already initialized.
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size_t len = strlen(_buf);
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char* buf_end = _buf + len;
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va_list argp;
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va_start(argp, format);
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jio_vsnprintf(buf_end, bufsz - len, format, argp);
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va_end(argp);
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}
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// Used to format messages.
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typedef FormatBuffer<> err_msg;
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#endif // SHARE_VM_UTILITIES_FORMATBUFFER_HPP
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