Strange getline behavior in c++

Question

I have the following file:

BB 7.501106 5.324115 7.997006 8.287983 11.314904 11.768281 ...

And i am 100% sure that the file is ok, i have even shown newlines in vim with :set list :

BB$ 7.501106 5.324115$ 7.997006 8.287983$ 11.314904 11.768281$ ...

But when i open and read in the first line something wierd happens. I have the following code:

std::ifstream file(filename); std::string line; if (!file.is_open()) { std::cerr << "parseConfig: Error opening config file: " << filename << std::endl; exit(1); } getline(file, line); std::cout << "line is: <" << line << ">" << std::endl; if (line.compare("BB")) { std::cerr << "parseConfig: Error in config file, first line is not BB" << std::endl; exit(1); }

Now i know the file is being opened correctly because we get all the way to the final error.

The print out is as following:

>ine is: <BB //What!!!?? Why did this happen? parseConfig: Error in config file, first line is not BB

Which strikes me as odd, its as if there is a carriage return in the text file. But i am so sure that there is not.

Any ideas?

John Kugelman · Accepted Answer · 2013-07-10 01:47:31Z

It looks like the file is in DOS mode. Check if vim displays [dos] at the bottom, or check file yourfile.txt.

Another way to check is by piping the file or the output of your program through cat -A (or cat -v if your cat doesn't have -A). Carriage returns will show up as ^M.

To convert to UNIX format, do :set ff=unix in vim and then save the file. Or use the dos2unix command-line tool if you have it.

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