eksternal file in hangman game, in C language

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

#define MAX_WORDS 1000
#define MAX_LEN 256

void shuffle(char * pword[], int words, int iterations)
{
  int n;

  if ( words <= 1) return;

  for (n=0; n<iterations; n++)
  {
    int i1, i2;
    i1 = rand()%words;
    i2 = rand()%words;
    char * tmp = pword[i1];
    pword[i1] = pword[i2];
    pword[i2] = tmp;
  }
}

int main()
{
  int n;
  char buf[MAX_LEN];
  char * pword[MAX_WORDS];
  int words = 0;

  FILE * fp = fopen("words.txt", "r");

  if ( ! fp ) return -1;

  while (!feof(fp))
  {
    if (words == MAX_WORDS) break;
    if (! fgets(buf, MAX_LEN, fp) ) break;
    buf[strlen(buf)-1] = '\0'; // remove newline
    pword[words] = strdup(buf); // this dynamically allocates memory
    words++;
  }
  fclose(fp);

  shuffle(pword, words, 2*words);

  for (n=0; n<words; n++)
    printf("%s\n", pword[n]);

  // cleanup
  for (n=0; n<words; n++)
    free( pword[n]);

  return 0;
}