114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
/*
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* Copyright (c) 2003-2012, John Wiegley. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of New Artisans LLC nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @addtogroup util
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*/
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/**
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* @file pstream.h
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* @author John Wiegley
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*
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* @ingroup util
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*/
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#ifndef _PSTREAM_H
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#define _PSTREAM_H
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//#include <istream>
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//#include <streambuf>
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class ptristream : public std::istream
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{
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class ptrinbuf : public std::streambuf
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{
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ptrinbuf(const ptrinbuf&);
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ptrinbuf& operator=(const ptrinbuf&);
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protected:
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char * ptr;
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std::size_t len;
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public:
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ptrinbuf(char * _ptr, std::size_t _len) : ptr(_ptr), len(_len) {
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if (*ptr && len == 0)
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len = std::strlen(ptr);
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setg(ptr, // beginning of putback area
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ptr, // read position
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ptr+len); // end position
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TRACE_CTOR(ptrinbuf, "char *, std::size_t");
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}
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~ptrinbuf() throw() {
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TRACE_DTOR(ptrinbuf);
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}
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protected:
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virtual int_type underflow() {
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// is read position before end of buffer?
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if (gptr() < egptr())
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return traits_type::to_int_type(*gptr());
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else
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return EOF;
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}
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virtual pos_type seekoff(off_type off, ios_base::seekdir way,
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ios_base::openmode)
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{
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switch (way) {
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case std::ios::cur:
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setg(ptr, gptr()+off, ptr+len);
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break;
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case std::ios::beg:
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setg(ptr, ptr+off, ptr+len);
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break;
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case std::ios::end:
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setg(ptr, egptr()+off, ptr+len);
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break;
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default:
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return pos_type(off_type(-1));
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}
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return pos_type(gptr() - ptr);
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}
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};
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protected:
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ptrinbuf buf;
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public:
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ptristream(char * ptr, std::size_t len = 0)
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: std::istream(0), buf(ptr, len) {
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rdbuf(&buf);
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}
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};
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#endif // _PSTREAM_H
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