#define NAME_MAX  14  /* longest filename component; */
                              /* system-dependent */

typedef struct {      /* portable directory entry: */
    long ino;	              /* inode number */
    char name[NAME_MAX+1];    /* name + '\0' terminator */
} Dirent;

typedef struct {      /* minimal DIR: no buffering, etc. */
    int fd;             /* file descriptor for directory */
    Dirent d;           /* the directory entry */
} DIR;

DIR *opendir(char *dirname);
Dirent *readdir(DIR *dfd);
void closedir(DIR *dfd);