[Read Files] files handling related snippet #file

ifstream.cpp

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
using namespace std;

int main(int argc, char *argv[]) {
    string input_filename = argv[1];
    ifstream input_stream;
    input_stream.open(input_filename);

    string line;
    getline(input_stream, line); // Get title line

    while (getline(input_stream, line)) {
        // parse a line
        istringstream iss(line);
        string field;

        getline(iss, field, ',');
        int time = stoi(field);

        getline(iss, field, ',');
        string sym = field;

        getline(iss, field, ',');
        bool isSell = (field == "S");
    }
    return 0;
}

is_file.cpp

#include <sys/stat.h>

bool is_file(const string path) {
    struct stat buf;
    stat(path.c_str(), &buf);
    return S_ISREG(buf.st_mode);
}

ls.cpp

#include <dirent.h>

// http://www.martinbroadhurst.com/list-the-files-in-a-directory-in-c.html
void read_directory(const string& name, vector<string>& v) {
    DIR* dirp = opendir(name.c_str());
    struct dirent * dp;
    while ((dp = readdir(dirp)) != NULL) {
        v.push_back(dp->d_name);
    }
    closedir(dirp);
}

tokenize.cpp

bool is_alpha(const char c) {
    if (c >= 'a' && c <= 'z') return true;
    if (c >= 'A' && c <= 'Z') return true;
    return false;
}

vector<string> tokenize(string file_path) {
    ifstream is;
    is.open(file_path);
    string str;
    vector<string> vs;
    for (string::iterator pos, prev; getline(is, str); ) {                
        for (pos = find_if(str.begin(), str.end(), is_alpha); pos != str.end();
            pos = find_if(prev, str.end(), is_alpha)) {
            prev = find_if_not(pos, str.end(), is_alpha);
            string token(pos, prev);
            transform(token.begin(), token.end(), token.begin(), ::tolower);
            vs.push_back(token);
        }
    }
    is.close();
    return vs;
}