CommandLineArgumentsMocker.cpp

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#include <boost/algorithm/string.hpp>
#include <cstring>
 
#include "CommandLineArguments.hpp"
#include "CommandLineArgumentsMocker.hpp"
 
CommandLineArgumentsMocker::CommandLineArgumentsMocker(std::string newArguments)
{
    // Save the location of the real arguments to be restored later...
    mpNumOldArgs = CommandLineArguments::Instance()->p_argc;
    mpOldArgs = CommandLineArguments::Instance()->p_argv;
 
    std::vector<std::string> strings;
    boost::split(strings, newArguments, boost::is_any_of("\t "));
 
    mNumArgs = strings.size() + 1;
 
    // Note that we allocate an extra pointer here since the standard says argv must contain
    // a final NULL pointer.  OpenMPI will segfault without this!
    // c.f. http://stackoverflow.com/questions/16418932/is-argvargc-equal-to-null-pointer
    mpArgs = new char* [mNumArgs+1];
 
    mpArgs[0] = (*mpOldArgs)[0]; // Program name
    mpArgs[mNumArgs] = nullptr;
 
    for (unsigned i=0; i<strings.size(); i++)
    {
        mpArgs[i+1] = new char[strings[i].length() + 1]; // NULL terminator
        strcpy(mpArgs[i+1], strings[i].c_str());
    }
 
    // Replace the original command line arguments.
    CommandLineArguments::Instance()->p_argc = &mNumArgs;
    CommandLineArguments::Instance()->p_argv= &mpArgs;
}
 
 
CommandLineArgumentsMocker::~CommandLineArgumentsMocker()
{
    for (int i=1; i<mNumArgs; i++)
    {
        delete[] mpArgs[i];
    }
    delete[] mpArgs;
 
    // Restore the real arguments
    CommandLineArguments::Instance()->p_argc = mpNumOldArgs;
    CommandLineArguments::Instance()->p_argv = mpOldArgs;
}