How to read file having different line ending in C++

Question

I have two files "linuxUTF8.srt" and "macANSI.srt". I am reading these files using getline(). as macANSI.srt has '\r' as line ending I am reading the whole file rather than a single line. I know I have to pass '\r' as delimiter but how do I know what type of line ending character I am dealing with.

Answer 1

As Sebastian said, we will need to read the block and then find out the appropriate line-ending.
So, we will need to open the file in binary mode and read the last characters.

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
void SetLineEnding(char *filename, std::string &newline, char &delimiter)
{
    std::string str;
    std::ifstream chk(filename,std::ios::binary);
    if(getline(chk, str))
    {
        if(str.size() && str[str.size()-1] == '\r') 
        {
            //It can be either \r or \r\n
            if(getline(chk, str))
            {
                delimiter = '\n';
                newline = "\\r\\n";
            }
            else
            {
                delimiter = '\r';
                newline = "\\r";
            }
        }
        else 
        {
            delimiter = '\n';
            newline = "\\n";
        }
    }
}
int32_t main()
{
    
    string newLine;
    string delimiter;
    char filename[256];
    in>>filename;
    SetLineEnding(filename,newLine,delimiter);
    std::ifstream inp(filename,ios::in);
    if(!inp.is_open())
    {
        cout<<"File not opened"<<endl;
        return 0;
    }
    //getline() function with delimiter
    string str;
    getline(inp,str,delimiter);
    
    return 0;
}

Now you can pass delimiter to getline() and you will be able to read according to line-ending.