#include <sys/stat.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>

void printfile(char *dir)
{
        DIR *dp;
        struct dirent *entry;
        struct stat statbuf;        

        if((dp = opendir(dir)) == NULL) {
           fprintf(stderr, "cannot open directory: %s\n", dir);
           return;

        }

        chdir(dir);
        while((entry = readdir(dp)) != NULL) {

           lstat(entry->d_name, &statbuf);

           if(S_ISREG(statbuf.st_mode)) {                
                 printf("%s\n", entry->d_name);
           }                

        }        
        closedir(dp);
}

int main()
{
        printfile(".");
        exit(0);
}

 struct stat statbuffer;
struct dirent *entry;
if(S_ISREG(statbuffer.st_size){
int i = sizeof(entry->d_name);
printf("%d\n", i);}