C++ strtok - multiple use with more data buffers

Question

I have little issue with using strtok() function. I am parsing two files. Firts I load file 1 into buffer. This file constains name of the second file

Answer 1

strtok is an evil little function which maintains global state, so (as you've found) you can't tokenise two strings at the same time. On some platforms, there are less evil variants with names like strtok_r or strtok_s; but since you're writing C++ not C, why not use the C++ library?

ifstream first_file(first_file_name);      // no need to read into a buffer
string line;
while (getline(first_file, line)) {
    if (!line.empty() && line[0] == 'f') { // NOT =
        istringstream line_stream(line);
        string second_file_name;
        line_stream.ignore(' ');           // skip first word ("%*s")
        line_stream >> second_file_name;   // read second word ("%s")
        LoadSecondFile(second_file_name);
    }
}