ls.c

#include<stdio.h>
#include<stdlib.h>
#include <sys/types.h>
#include <dirent.h>

int main(void) {
  char *curr_dir = NULL;
  DIR *dp = NULL;
  struct dirent *dptr = NULL;
  unsigned int count = 0;

  // Get the value of environment variable PWD
  curr_dir = getenv("PWD");
  if(NULL == curr_dir) {
    printf("\n ERROR : Could not get the working directory\n");
    return -1;
  }

  // Open the current directory
  dp = opendir((const char*)curr_dir);
  if(NULL == dp) {
    printf("\n ERROR : Could not open the working directory\n");
    return -1;
  }

  printf("\n");
  // Go through and display all the names (files or folders)
  // Contained in the directory.
  for(count = 0; NULL != (dptr = readdir(dp)); count++) {
    printf("%s  ",dptr->d_name);
  }
  printf("\n %u", count);

  return 0;
}