Boost :: Regex Segfault (I think)

Question

I am having a problem with some C ++ code that I am running. Basically, it works great with most inputs, but with certain inputs it turns off after returning my main function. It was ... puzzling. I stopped the run in segfault to get the stack trace, and it returned this:

#0 malloc_consolidate() at /build/eglibc-oGUzwX/eglibc-2.19/malloc/malloc.c:4151
#1 _int_free() at /build/eglibc-oGUzwX/eglibc-2.19/malloc/malloc.c:4057
#2 boost::re_detail::mem_block_cache::~mem_block_cache()() at /usr/lib/x86_64-linux-gnu/libboost_regex.so.1.54.0
#3 __cxa_finalize() at /build/eglibc-oGUzwX/eglibc-2.19/stdlib/cxa_finalize.c:56
#4 ??() at /usr/lib/x86_64-linux-gnu/libboost_regex.so.1.54.0
#5 ??() at 
#6 _dl_fini() at /build/eglibc-oGUzwX/eglibc-2.19/elf/dl-fini.c:252

It made me think that I should do something wrong with regex, but I can't make life understand me. The way I use regex is that users can enter a bunch of strings. These lines can be plain text, or they can be regular expressions. Because of this, I mainly interact with all inputs as regular expressions. But what if the user gave a string that was intended as plain text but had a character that could be interpreted differently as a regular expression? What I am doing is going through the input lines of plain text and avoiding all these characters.

Here is the code I'm working with. This is my main point:

int
main(int argc, char * argv[])
{

    // Process input arguments
    // The desired input is numVertices (int), graph density (double between 0 and 1), halfLoss (double), total loss (double),
    // position expanse (double, m), velocity expanse (double, m/s)
    int num_vertices;
    double graph_density ;
    double half_loss;
    double total_loss;
    double position_expanse;
    double velocity_expanse;

    if (argc == 1)
    {
        num_vertices = 48;
        graph_density = 1;
        half_loss = 200000;
        total_loss = 400000;
        position_expanse = 400000;
        velocity_expanse = 10000;
    }
    else
    {
        if (argc != 7)
        {
            std::cerr << "Need 6 input arguments" << std::endl;
            return 1;
        }

        std::istringstream ss(argv[1]);
        num_vertices;
        if (!(ss >> num_vertices))
            std::cerr << "First input must be an integer" << std::endl;

        graph_density = read_double_input(argv[2]);
        half_loss = read_double_input(argv[3]);
        total_loss = read_double_input(argv[4]);
        position_expanse = read_double_input(argv[5]);
        velocity_expanse = read_double_input(argv[6]);
    }

    // Determine how many edges to create
    int num_edges = (int) ( (graph_density * num_vertices * (num_vertices - 1)) + 0.5 );

    // Create the edges
    int edges_created = 0;
    std::set<std::pair<int, int> > edge_set;
    while (edge_set.size() < num_edges)
    {

        // Pick a random start vertex and end vertex
        int start_vertex = rand() % num_vertices;
        int end_vertex = rand() % num_vertices;

        // Make sure the start and end vertices are not equal
        while (start_vertex == end_vertex)
        {
            end_vertex = rand() % num_vertices;
        }

        // Insert the new edge into our set of edges
        edge_set.insert(std::pair<int, int>(start_vertex, end_vertex));

    }

    // Create connection handler
    ConnectionHandler conn_handler;

    // Create lists for from and to vertices
    std::vector<std::string> from_list;
    std::vector<std::string> to_list;

    // Add connections to from and to lists
    for (std::set<std::pair<int, int> >::const_iterator edge_it = edge_set.begin(), end_it = edge_set.end(); edge_it != end_it; ++edge_it)
    {
        int start_vertex = edge_it->first;
        int end_vertex = edge_it->second;
        from_list.push_back("Radio" + int_to_string(start_vertex));
        to_list.push_back("Radio" + int_to_string(end_vertex));
    }

    // Read the list into the connection handler
    conn_handler.read_connection_list(true, from_list, to_list);    
    return 0;

}

This code has this ConnectionHandler object that I created. Here is the title for this:

#ifndef CLCSIM_CONNECTIONHANDLER_HPP_
#define CLCSIM_CONNECTIONHANDLER_HPP_

#include <models/network/NetworkTypes.hpp>
#include <generated/xsd/NetworkModelInterfaceConfig.hpp>

namespace clcsim
{

typedef std::map<std::string, std::set<std::string> > ConnectionFilter;

class ConnectionHandler
{

public:

    ConnectionHandler();
    ~ConnectionHandler();

    void read_connection_list(const bool is_white_list, const std::vector<std::string> &from_radios, const std::vector<std::string> &to_radios);


private:

    ConnectionFilter filter_;
    std::set<std::string> from_list_;
    std::set<std::string> to_list_;
    bool is_white_list_;

};

} // namespace clcsim

#endif // CLCSIM_CONNECTIONHANDLER_HPP_

And here is the source:

#include <models/network/ConnectionHandler.hpp>
#include <oasis/framework/exceptions/ConfigurationException.h>
#include <boost/regex.hpp>

namespace clcsim 
{

ConnectionHandler::
ConnectionHandler()
{
}

ConnectionHandler::
~ConnectionHandler()
{
    std::cout << "Destructing conn handler" << std::endl;
}

void 
ConnectionHandler::
read_connection_list(
    const bool is_white_list, 
    const std::vector<std::string> &from_radios, 
    const std::vector<std::string> &to_radios)
{

    std::cout << "Reading the connection list" << std::endl;

    // Make sure the size of both the input vectors are the same
    std::size_t from_radio_size = from_radios.size();
    std::size_t to_radio_size = to_radios.size();
    if (from_radio_size != to_radio_size)
    {
        throw ofs::ConfigurationException("Error while initializing the "
                                          "Network model: "
                                          "Connections in from/to lists don't align"
                                         );
    }

    // Create a regular expression/replacement to find all characters in a non-regular expression
    // that would be interpreted as special characters in a regular expression. Replace them with
    // escape characters
    const boost::regex esc("[.$|()\\[\\]{}*+?\\\\]");
    const std::string rep("\\\\&");

    // Iterate through the specified connections
    for (int i = 0; i < from_radio_size; ++i)
    {

        std::string from_string = boost::regex_replace(from_radios[i], esc, rep, boost::match_default | boost::format_sed);
        std::string to_string = boost::regex_replace(to_radios[i], esc, rep, boost::match_default | boost::format_sed);
        //std::cout << "From " << from_string << " to " << to_string << std::endl;
        filter_[from_string].insert(to_string);
        //filter_[from_radios.at(i)].insert(to_radios.at(i));
    }

    std::cout << "Got here" << std::endl;

}


} // namespace clcsim

Sorry for so much code.

, segfaults boost:: regex. , , . , Boost. , , . ... . !

Answer 1

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