/*
Name Meaning
ios::goodbit No error bits set
ios::eofbit 1 when end-of-file is encountered; 0 otherwise
ios::failbit 1 when a (possibly) nonfatal I/O error has occurred; 0 otherwise
ios::badbit 1 when a fatal I/O error has occurred; 0 otherwise
*/
#include <iostream>
#include <fstream>
using namespace std;
void checkstatus(ifstream &in);
int main(int argc, char *argv[])
{
if(argc!=2) {
cout << "Usage: Display <filename>\n";
return 1;
}
ifstream in(argv[1]);
if(!in) {
cout << "Cannot open input file.\n";
return 1;
}
char c;
while(in.get(c)) {
if(in) cout << c;
checkstatus(in);
}
checkstatus(in); // check final status
in.close();
return 0;
}
void checkstatus(ifstream &in)
{
ios::iostate i;
i = in.rdstate();
if(i & ios::eofbit)
cout << "EOF encountered\n";
else if(i & ios::failbit)
cout << "Non-Fatal I/O error\n";
else if(i & ios::badbit)
cout << "Fatal I/O error\n";
}
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