PLearn 0.1
openFile.cc
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00001 // -*- C++ -*-
00002 
00003 // openFile.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: openFile.cc 9520 2008-10-03 18:50:46Z nouiz $ 
00037  ******************************************************* */
00038 
00039 // Authors: Pascal Vincent, Christian Hudon
00040 
00044 #include "openFile.h"
00045 #include <nspr/prio.h>
00046 #include <plearn/io/fileutils.h>
00047 #include <plearn/io/PrPStreamBuf.h>
00048 
00049 namespace PLearn {
00050 using namespace std;
00051 
00075 PStream openFile(const PPath& filepath_, PStream::mode_t io_formatting,
00076                  const string& openmode, bool err_if_dont_exist, bool make_dirs)
00077 {
00078     const PPath filepath = filepath_.absolute();
00079     
00080     if(make_dirs)
00081         force_mkdir(filepath.dirname());
00082 
00083     PStream st;
00084     PRFileDesc* fd;
00085     if ((openmode == "r" || openmode == "a") && isdir(filepath))
00086         PLERROR("In openFile(..) - Cannot open this directory for reading or "
00087                 "append (%s), it should be a file!", filepath.c_str());
00088 
00089     if (openmode == "r")
00090     {
00091         fd = PR_Open(filepath.c_str(), PR_RDONLY, 0666);
00092         if (!fd && err_if_dont_exist)
00093             PLERROR("openFile(\"%s\",\"%s\") failed.",filepath.c_str(), openmode.c_str());
00094         else if(!fd)
00095             return new PrPStreamBuf(0, 0);
00096         st = new PrPStreamBuf(fd, 0, true, false);
00097     }
00098     else if (openmode == "w")
00099     {
00100         fd = PR_Open(filepath.c_str(), PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE, 0666);
00101         if (!fd)
00102             PLERROR("openFile(\"%s\",\"%s\") failed.",filepath.c_str(), openmode.c_str());
00103         st = new PrPStreamBuf(0, fd, false, true);
00104     }
00105     else if (openmode == "a")
00106     {
00107         fd = PR_Open(filepath.c_str(), PR_WRONLY | PR_CREATE_FILE | PR_APPEND, 0666);
00108         if (!fd)
00109             PLERROR("openFile(\"%s\",\"%s\") failed.",filepath.c_str(), openmode.c_str());
00110         st = new PrPStreamBuf(0, fd, false, true);
00111     }
00112     else
00113         PLERROR("In openFile, invalid openmode=\"%s\" ",openmode.c_str());    
00114     
00115     st.setMode(io_formatting);
00116     return st;
00117 }
00118 
00119 } // end of namespace PLearn
00120 
00121 
00122 /*
00123   Local Variables:
00124   mode:c++
00125   c-basic-offset:4
00126   c-file-style:"stroustrup"
00127   c-file-offsets:((innamespace . 0)(inline-open . 0))
00128   indent-tabs-mode:nil
00129   fill-column:79
00130   End:
00131 */
00132 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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