File I/O loop.

I've written a little tool for myself to split a long text file into several shorter ones. (Probably re-invented to wheel too. Heh.)

The bit I'm concerned about follows. The question is: is it possible to avoid write/read to buffer in a trivial way in an effort to improve the execution speed?

Code:

    int counter = 0;
    char buffer[1025];
    while (inFile.good()) {
        char outname[256];
        if (df) {
            sprintf(outname, ".\\%s\\%s%i.txt", basename, basename, counter);
        } else {
            sprintf(outname, "%s%i.txt", basename, counter);
        }
        
        std::ofstream outFile(outname);
        if (!outFile.is_open()) {
            std::cout << "Output file " << outname
                      << " could not be written.\nInterrupting.\n"
                         "Clean up and restart the program.\n";
            return 1;
        }
        
        for (int i = 1; i <= lines && inFile.good(); i++) {
            inFile.getline(buffer, 1025);
            outFile << buffer << '\n';
        }
        outFile.close();
        std::cout << "File " << outname << " written successfully.\n";
        counter++;
    }

P.S.
Feel free to suggest improvements where they can be made.

Originally Posted by msh

I've written a little tool for myself to split a long text file into several shorter ones. (Probably re-invented to wheel too. Heh.)

The bit I'm concerned about follows. The question is: is it possible to avoid write/read to buffer in a trivial way in an effort to improve the execution speed?

Code:

    int counter = 0;
    char buffer[1025];
    while (inFile.good()) {
        char outname[256];
        if (df) {
            sprintf(outname, ".\\%s\\%s%i.txt", basename, basename, counter);
        } else {
            sprintf(outname, "%s%i.txt", basename, counter);
        }
        
        std::ofstream outFile(outname);
        if (!outFile.is_open()) {
            std::cout << "Output file " << outname
                      << " could not be written.\nInterrupting.\n"
                         "Clean up and restart the program.\n";
            return 1;
        }
        
        for (int i = 1; i <= lines && inFile.good(); i++) {
            inFile.getline(buffer, 1025);
            outFile << buffer << '\n';
        }
        outFile.close();
        std::cout << "File " << outname << " written successfully.\n";
        counter++;
    }

P.S.
Feel free to suggest improvements where they can be made.

Use string streams and strings, not character arrays and sprintf. You're writing C++, not C.

I love my arrays.

But yea, you're right. I should rewrite it using strings.