/**************************************************************
 * A simpler and shorter implementation of ls.
 * Adapted from Wikipedia.
 **************************************************************/

#include <stdio.h>
#include <dirent.h>
 
int listdir(const char *path) {
  struct dirent *entry;
  DIR *dp;
 
  dp = opendir(path);
  if (dp == NULL) {
    perror("opendir");
    return -1;
  }
 
  while((entry = readdir(dp)))
    puts(entry->d_name);
 
  closedir(dp);
  return 0;
}
 
int main(int argc, char **argv) {
  int counter = 1;
 
  if (argc == 1)
    listdir(".");
  else if (argc == 2)
    listdir(argv[1]);
  else printf("Usages: ls    or   ls dirPath\n");
 
  return 0;
}