/* showdir.c */
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <stdio.h>

int main(int argc,char *argv[])
{
    DIR *dir;
    struct dirent *dent;
    struct stat st;
    char *directory_name = ".";
    char file_name[120];

    if(argc > 1)
        directory_name = argv[1];

    if((dir = opendir(directory_name)) ==  NULL) {
        perror("Cannot open directory");
        exit(1);
    }
    while(dent = readdir(dir)) {
        printf("%s\n",dent->d_name);
        sprintf(file_name,"%s/%s",
                directory_name,dent->d_name);
        if(stat(file_name,&st) < 0) {
            perror("Cannot get file status");
            errno = 0;
            continue;
        }
        printf("    A");
        if(S_ISLNK(st.st_mode))
            printf(" symbolic link");
        if(S_ISREG(st.st_mode))
            printf(" regular file");
        if(S_ISDIR(st.st_mode))
            printf(" directory");
        if(S_ISCHR(st.st_mode))
            printf(" character device");
        if(S_ISBLK(st.st_mode))
            printf(" block device");
        if(S_ISFIFO(st.st_mode))
            printf(" fifo");
        if(S_ISSOCK(st.st_mode))
            printf(" socket");
        printf("\n");
        printf("    Owner group: %d   user: %d\n",
                st.st_gid,st.st_uid);
        printf("    File size in bytes: %d\n",st.st_size);
        printf("    Accessed: %s",ctime(&st.st_atime));
        printf("    Modified: %s",ctime(&st.st_mtime));
        errno = 0;
    }
    if(errno != 0)
        perror("Cannot read directory entry");
    closedir(dir);
    exit(0);
}