verzeichnisbaum

#include <string.h>
#include <limits.h>
#include <dirent.h>
#include <stdlib.h>
#include <stdio.h>


void writer(int level){

  const char characters[] = "|   ";
 unsigned int length=strlen(characters)*(level+1);
    char postfix[length];
    memset( postfix, '\0', sizeof(char)*length );



    for(level;level>0;level--)
    strcat(postfix, characters);
    printf("%s", postfix);
}


void tree(char *path, int level)
{

    struct dirent *direntry;
    DIR *directory;



    chdir(path);  //in neues Verzeichnis wechseln

    directory=opendir(".");

    if(directory)
    {

        while((direntry=readdir(directory)) != 0)
        {

            if(strcmp(direntry->d_name, ".") != 0 && strcmp(direntry->d_name, "..") != 0)
            {
            if(strlen(direntry->d_name)>PATH_MAX)
            printf("path name is too long\n");

                if(direntry->d_type==DT_DIR)
                {
                writer(level+1);
                    printf("|---[%s]\n",direntry->d_name );
                    tree(direntry->d_name,level+1);
                }
                else
                writer(level);
                    printf("|---[%s]\n", direntry->d_name );
            }
        }
        closedir(directory);
    }

}


int main(int argc, char const *argv[])
{
    DIR *dir;
    char *path;

    path=argv[1];

    if(path==0)  //wenn nichts angegben wurde dann
        path=".";  //wähle aktuelles Verzeichnis

    dir=opendir(path);

    if(dir!=0)
    {
        tree(path,0);
    }
    else
    {
        printf("%s is a wrong directory name\n", argv[1]);
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}