Only 10 recent logs

logs.cpp

#include <iostream>
#include <dirent.h>
#include <sys/stat.h>
#include <string>
#include <cstring>
#include <map>

template<typename Key, typename T>
void flipMap(const std::map<Key, T> & source,
             std::multimap<T, Key, std::greater<T>> & result) {
    typedef std::map<Key, T> source_type;
    typedef typename source_type::const_iterator source_iterator;
    for (source_iterator i = source.begin(), end = source.end(); i != end; ++i) {
        result.insert(std::make_pair((*i).second, (*i).first));
    }
}

int main() {
    char g_path[] = "/home/schdub/src/work/bmc-acr122/app/logs";

    DIR *theFolder = ::opendir(g_path);
    if (theFolder == NULL)
        return 1;

    struct dirent *next_file;
    char filepath[256];

    std::multimap<time_t, std::string, std::greater<time_t>> logs_sorted; {
    std::map<std::string, time_t> logs;
    while ((next_file = ::readdir(theFolder)) != NULL) {
        size_t len = strlen(next_file->d_name);
        const char * ext = &next_file->d_name[len-4];
        if (len <= 4 || ::strcmp(ext, ".log")) continue;
        // build the path for each file in the folder
        ::sprintf(filepath, "%s%s%s", g_path, "/", next_file->d_name);
        struct stat info;
        if (::stat(filepath, &info) == 0) {
            logs[std::string(filepath)] = info.st_mtim.tv_sec;
            std::cout << next_file->d_name << " " << info.st_mtim.tv_sec << std::endl;
        }
    }
    ::closedir(theFolder);
    flipMap(logs, logs_sorted);
    }

    unsigned cnt = 0;
    unsigned required = 10;
    for (auto i = logs_sorted.begin(), end = logs_sorted.end(); i != end; ++i, ++cnt) {
        std::cout << (*i).second << " " << (*i).first << std::endl;
        if (cnt < required) continue;
//        ::remove((*i).second.c_str());
    }
}