GetCurrentWorkingDirectory.cpp

00001 /*
00002 
00003 Copyright (C) University of Oxford, 2005-2011
00004 
00005 University of Oxford means the Chancellor, Masters and Scholars of the
00006 University of Oxford, having an administrative office at Wellington
00007 Square, Oxford OX1 2JD, UK.
00008 
00009 This file is part of Chaste.
00010 
00011 Chaste is free software: you can redistribute it and/or modify it
00012 under the terms of the GNU Lesser General Public License as published
00013 by the Free Software Foundation, either version 2.1 of the License, or
00014 (at your option) any later version.
00015 
00016 Chaste is distributed in the hope that it will be useful, but WITHOUT
00017 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00018 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
00019 License for more details. The offer of Chaste under the terms of the
00020 License is subject to the License being interpreted in accordance with
00021 English Law and subject to any action against the University of Oxford
00022 being under the jurisdiction of the English Courts.
00023 
00024 You should have received a copy of the GNU Lesser General Public License
00025 along with Chaste. If not, see <http://www.gnu.org/licenses/>.
00026 
00027 */
00028 
00029 #include "GetCurrentWorkingDirectory.hpp"
00030 
00031 #include <cstdlib>
00032 #include <cerrno>
00033 
00034 #include "Exception.hpp"
00035 #include <unistd.h> // For getcwd()
00036 
00037 std::string GetCurrentWorkingDirectory()
00038 {
00039     size_t bufsize = 1000;
00040     char* p_buffer = NULL;
00041     while (true)
00042     {
00043         p_buffer = (char*) malloc(bufsize);
00044         if (!p_buffer)
00045         {
00046 #define COVERAGE_IGNORE
00047             // Rather a tricky one to cover...
00048             EXCEPTION("Run out of memory to allocate CWD buffer");
00049 #undef COVERAGE_IGNORE
00050         }
00051         if (getcwd(p_buffer, bufsize) == p_buffer)
00052         {
00053             break;
00054         }
00055 #define COVERAGE_IGNORE
00056         // Also rather a tricky one to cover...
00057         else
00058         {
00059             free(p_buffer);
00060             if (errno != ERANGE)
00061             {
00062                 EXCEPTION("Unable to determine current working directory");
00063             }
00064             bufsize *= 2;
00065         }
00066 #undef COVERAGE_IGNORE
00067     }
00068 
00069     std::string cwd(p_buffer);
00070     free(p_buffer);
00071     return cwd;
00072 }

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