/*+
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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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+
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#ifndef SHARE_VM_UTILITIES_FORMATBUFFER_HPP+
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#define SHARE_VM_UTILITIES_FORMATBUFFER_HPP+
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+
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#include "utilities/globalDefinitions.hpp"+
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#include "prims/jvm.h"+
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#include <stdarg.h>+
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+
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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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+
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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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+
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class FormatBufferDummy {};+
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+
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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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+
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  char* buffer() { return _buf; }+
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  int size() { return bufsz; }+
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+
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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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+
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 protected:+
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  inline FormatBuffer();+
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};+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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// Used to format messages.+
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typedef FormatBuffer<> err_msg;+
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+
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#endif // SHARE_VM_UTILITIES_FORMATBUFFER_HPP+
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