Segmentation fault with ifstream

[BoboTiG]

Hello,

My program has to read from stdin. Something like cat filename | my_program.

I success to read from cin as:

string line;
while ( getline(cin, line) ) {
	if ( ligne.legth() > 0 ) {
		cout << line << endl;
	}
}

The issue is when data from cin is too heavy. Here with a file with only 2000 lines (the longest is 25 chars), I have a segfault.

Do you have an idea how to fix that?
I tried to count lines, and if count == 100 I do cin.clear() but it is inefficient.

Thanks in advance.

[jsmith]

But getline() reads only up to the next newline, so it should not matter how many lines are in the file.

[Lotus]

The problem is probably that getline returns cin, in this case.
You could try the following:

#include <iostream>
#include <string>

using namespace std;

int main(void)
{
     string line;
     while(!getline(cin,line).eof())
           if(line.length() > 0)
                cout << line << endl;
}

[krjeev]

Use char* in place of string with getline() method. It should work.
I do not think if you are using Lotus version you need the if statement "if(line.length() > 0)
", it will just increase the run time and size of code than it will do the good.
Its good idea to use Lotus version of while statement while(!getline(cin,line).eof())
. It will reduce the compexcity of code as will as improve the performance and save you to overhead of handle error.

[BoboTiG]

Thanks, I use:

! getline(cin,line).eof()