Re: C++ and S_ISDIR() problem

On Saturday, 12. November 2005 21:37, N. Thompson wrote:
> I'm trying to write a program that goes through folders recursively and
> lists what it finds in a specific format; however, I am having very strange
> problems with it in Ark Linux and I'm wondering if the problem is with AL,
> or if the posix headers have a major bug.

Probably neither -- if this didn't work correctly, you'd almost certainly see 
very odd stuff happening in KDE (KDE/Qt use S_ISDIR internally).

S_ISDIR and friends are not exactly an intuitive API though... The POSIX guys 
unfortunately don't have Qt's or KDE's API designers ;)

> The problem so far is that S_ISDIR(...) is returning true in many cases on
> plain text files. This is my absolute first time using POSIX libraries in a
> program so I'm not even sure if I'm doing it right.

Chances are you aren't.

> I'll send the source code to anyone who thinks they can help on the
> understanding

Please do -- or maybe this will help: here's an example of using it correctly:

extern "C" {
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
}

#include <iostream>
using namespace std;

int main(int argc, char **argv)
{
	if(argc<2) {
		cerr << "Usage: " << argv[0] << " filename [filename] [filename] ....." << 
endl;
		return 1;
	}
	for(int i=1; i<argc; i++) {
		struct stat s;
		if(stat(argv[i], &s))
			cerr << argv[i] << ": " << strerror(errno) << endl;
		else {
			cerr << argv[i] << " is ";
			if(!S_ISDIR(s.st_mode))
				cerr << "not ";
			cerr << "a directory" << endl;
		}
	}
}