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153 lines
3.2 KiB
C++
153 lines
3.2 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/** @file */
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/*
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* classes isyncstream and osyncstream provide a C++ iostream interface
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* for C stdio FILE* streams. The current implementation does not provide
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* the necessary methods to support seeking. The I/O buffering of the
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* input FILE* is used. The C++ iostream library calls syncbuf::sync()
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* for every line, so output buffering is line-by-line.
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* */
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/*
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#include "syncstream.h"
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void copyStream(istream& iss, ostream& oss)
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{
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string line;
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getline(iss, line);
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while (iss.good())
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{
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oss << line << endl;
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getline(iss, line);
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}
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}
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main()
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{
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FILE* ifp;
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FILE* ofp;
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...
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isyncstream iss(ifp);
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osyncstream oss(ofp);
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copyStream(iss, oss);
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...
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}
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*/
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#ifndef SYNCSTREAM_H__
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#define SYNCSTREAM_H__
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#include <iostream>
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#include <cstdio>
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namespace syncstream
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{
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/** A streambuf implementation for C stdio FILE* streams.
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*
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* Adapted from http://www.drdobbs.com/184401305
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*/
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class syncbuf : public std::streambuf
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{
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public:
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/** ctor */
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syncbuf(FILE* f) : std::streambuf(), fptr(f) {}
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protected:
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/** Write character in the case of overflow */
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virtual int overflow(int c = EOF)
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{
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return (c != EOF ? fputc(c, fptr) : EOF);
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}
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/** Get character in the case of overflow */
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virtual int underflow()
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{
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int c = getc(fptr);
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if (c != EOF)
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ungetc(c, fptr);
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return c;
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}
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/** Get character in the case of overflow and advance get pointer */
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virtual int uflow()
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{
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return getc(fptr);
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}
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/** put character back in the case of backup underflow */
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virtual int pbackfail(int c = EOF)
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{
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return (c != EOF ? ungetc(c, fptr) : EOF);
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}
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/** Synchronize stream buffer */
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virtual int sync()
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{
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return fflush(fptr);
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}
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private:
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FILE* fptr;
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};
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/** An istream adaptor for input FILE* streams */
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class isyncstream : public std::istream
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{
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public:
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/** ctor */
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isyncstream() : istream(&buf), buf(0) {}
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/** ctor */
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isyncstream(FILE* fptr) : istream(&buf), buf(fptr) {}
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/** const streambuf accessor */
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const syncbuf* rdbuf() const
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{
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return &buf;
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}
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private:
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syncbuf buf;
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};
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/** An ostream adaptor for output FILE* streams */
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class osyncstream : public std::ostream
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{
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public:
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/** ctor */
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osyncstream() : ostream(&buf), buf(0) {}
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/** ctor */
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osyncstream(FILE* fptr) : ostream(&buf), buf(fptr) {}
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/** const streambuf accessor */
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const syncbuf* rdbuf() const
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{
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return &buf;
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}
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private:
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syncbuf buf;
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};
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}
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#endif
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