PLearn 0.1
StringPStreamBuf.cc
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00001 // -*- C++ -*-
00002 
00003 // StringPStreamBuf.cc
00004 //
00005 // Copyright (C) 2004 Pascal Vincent 
00006 // 
00007 // Redistribution and use in source and binary forms, with or without
00008 // modification, are permitted provided that the following conditions are met:
00009 // 
00010 //  1. Redistributions of source code must retain the above copyright
00011 //     notice, this list of conditions and the following disclaimer.
00012 // 
00013 //  2. Redistributions in binary form must reproduce the above copyright
00014 //     notice, this list of conditions and the following disclaimer in the
00015 //     documentation and/or other materials provided with the distribution.
00016 // 
00017 //  3. The name of the authors may not be used to endorse or promote
00018 //     products derived from this software without specific prior written
00019 //     permission.
00020 // 
00021 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00022 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00023 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00024 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00025 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00026 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00027 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00029 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00030 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00031 // 
00032 // This file is part of the PLearn library. For more information on the PLearn
00033 // library, go to the PLearn Web site at www.plearn.org
00034 
00035 /* *******************************************************      
00036  * $Id: StringPStreamBuf.cc 3994 2005-08-25 13:35:03Z chapados $ 
00037  ******************************************************* */
00038 
00039 // Authors: Pascal Vincent
00040 
00044 #include "StringPStreamBuf.h"
00045 // #include <unistd.h>
00046 
00047 namespace PLearn {
00048 using namespace std;
00049 
00050 StringPStreamBuf::StringPStreamBuf(string* ptrs, const string& openmode, bool own_string_,
00051                                    streamsize inbuf_capacity, streamsize outbuf_capacity, streamsize unget_capacity)
00052     :PStreamBuf(openmode=="r", openmode=="w" || openmode=="a", inbuf_capacity, outbuf_capacity, unget_capacity),
00053      st(ptrs), read_index(0), own_string(own_string_)
00054 {
00055     if(openmode=="w") // truncate it first
00056         st->clear();
00057 
00058     else if(openmode!="r" && openmode!="a")
00059         PLERROR("In StringPStreamBuf invalid openmode %s, must be one of r, w, a",openmode.c_str());
00060 }
00061 
00062 StringPStreamBuf::StringPStreamBuf(const string* ptrs, const string& openmode, bool own_string_,
00063                                    streamsize inbuf_capacity, streamsize unget_capacity)
00064     :PStreamBuf(true, false, inbuf_capacity, 0, unget_capacity),
00065      st(const_cast<string*>(ptrs)), read_index(0), own_string(own_string_)
00066 {
00067     if(openmode!="r")
00068         PLERROR("In StringPStreamBuf(const string*, ...) invalid openmode %s, must be one of r if giving a const string* ",openmode.c_str());    
00069 }
00070 
00071 StringPStreamBuf::~StringPStreamBuf()
00072 {
00073     flush();
00074     
00075     if(own_string && st!=0)
00076         delete st;
00077 }
00078 
00079 StringPStreamBuf::streamsize StringPStreamBuf::read_(char* p, streamsize n)
00080 {
00081     string::size_type nread = st->copy(p, string::size_type(n), read_index); 
00082     read_index += nread;
00083     return streamsize(nread);
00084 }
00085 
00087 void StringPStreamBuf::write_(const char* p, streamsize n)
00088 {
00089     while(n--)
00090         st->operator+=(*p++);
00091 }
00092   
00093 } // end of namespace PLearn
00094 
00095 
00096 /*
00097   Local Variables:
00098   mode:c++
00099   c-basic-offset:4
00100   c-file-style:"stroustrup"
00101   c-file-offsets:((innamespace . 0)(inline-open . 0))
00102   indent-tabs-mode:nil
00103   fill-column:79
00104   End:
00105 */
00106 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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