using readdir to display files

sutho1 · 10-10-2003, 06:54 PM

Hi all
I am wondering if anyone can help me with a programming problem I am having. I have written a program that mimics the command ls -1F and it will open the current working directory and then display all the files and sub directories located there. What it does not do however is display the symbol after the file name eg a * for an executable, a / for a directory, a @ for a symbolic link etc. Can anyone explain to me how these symbols could be made to display. Is there a function in either dirent.h or stat.h that can do this?

Here is my code so far.....

#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>

using namespace std;

int main(int argc, char *argv[])
{

struct dirent *dir;
char *cwd;
DIR *open;
char *ptr;

if(argc > 1)
cout<<"ls -1F ";
for (int i=1; i < argc; i++)
cout <<argv[i];
cout<<endl;
if(argc < 2)
{
cwd = getcwd(ptr,20);
open = opendir(cwd);
while((dir = readdir(open)) != NULL)
cout<<dir->d_name<<endl;

}

exit(0);
}

Thanks
Sutho

mr_segfault · 10-10-2003, 08:38 PM

There sure is. Do a:

man -S2 stat

Note the S is uppercase..

this will allow you to stat each file, then determin if it is a link/regularfile/directory etc..

There might be an easier/quicker (as in cheaper) method but I can't think of one at the moment..

Cheers..

SaTaN · 10-10-2003, 09:09 PM

I suppose this should make things clear...
I haven't got a linux machine to check it . But I think that this is the way you do it.

Code:

#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
int main(int argc,char **argv)
{
        int num,i;
        struct dirent **name_list;
        struct stat BUFFER;
        //The path of the directory to be listed should be given as cmd line argument
        num=scandir(argv[1],&name_list,0,alphasort);
        for(i=0;i<num;i++)
        {
                stat(name_list[i]->d_name,&BUFFER);
                //To check if it is a dir or not
                if(S_ISDIR(BUFFER.st_mode))
                {
                                printf("%s --- directory \n",name_list[i]->d_name);
                }
        }
}

P.S :- Is your program working fiine ??? I think there is an error with the getcwd thing...Maybe I am wrong about your program