[os] read directory entries

[xgiovio]

#include <unistd.h>
#include <dirent.h>
#include <sys/types.h>
#include <st***.h>
#include <stdlib.h>

/***
 *               _            _                          
 *              (_)          (_)                          
 *    __  ____ _ _  _____   ___  ___   ___ ___  _ __ ___  
 *    \ \/ / _` | |/ _ \ \ / / |/ _ \ / __/ _ \| '_ ` _ \
 *     >  < (_| | | (_) \ V /| | (_) | (_| (_) | | | | | |
 *    /_/\_\__, |_|\___/ \_/ |_|\___(_)___\___/|_| |_| |_|
 *          __/ |                                        
 *         |___/
 *
 *
 *      Utilizzo : directory [nome-directory]
 *          stampa su stdout tutti i file/cartelle contenuti in nome-directory
 *
 *        
 */



int main ( int n_values, char ** values  ) {
      
        
    DIR * directory;
    struct dirent * dir_entry;
    
    
    directory = opendir(*(values + 1));
        if ( directory == NULL ){
            
            fprintf(stderr,"Impossibile leggere directory %s\n",*(values + 1));
            exit (-2);
            
        }
      
       fprintf(stderr,"La directory %s contienre le seguenti entry:\n",*(values + 1));
    for ( dir_entry = readdir(directory); \
          dir_entry != NULL; \
          dir_entry = readdir(directory)){
        
            fprintf(stdout,"-- %s\n",(char *) &(dir_entry->d_name));
        
    }
    
    closedir(directory);
    
    
    return 0;
}