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

#define NAME_MAX 255

int main(int argc, char *argv[]){

  char str_buffer[NAME_MAX];
  char *curr_dir_path;
  DIR *dir;
  struct dirent *entry;

  /* get path and open directory */
  getcwd(str_buffer, NAME_MAX);
  printf("Buffer contents: %sn", str_buffer);
  curr_dir_path = malloc(strlen(str_buffer) * sizeof(char));
  strncpy(curr_dir_path, str_buffer, NAME_MAX);
  printf("dir path: %sn", curr_dir_path);

  dir = opendir(curr_dir_path);

  while(entry = readdir(dir)){
    printf("Entry name: %sn", entry->d_name);
  }

  return 0;

}

gcc test2.c 
test2.c: In function ‘main’:
test2.c:18: warning: incompatible implicit declaration of built-in function ‘strlen’
test2.c:19: warning: incompatible implicit declaration of built-in function ‘strncpy’