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

/*
 * computes a password consisting of random words 
 */

int main(int argc, char* argv[])
{
  if (argc<3){
    printf("Usage:\n%s <path to wordlist> <number of words in password>\n", argv[0]);
    exit(EXIT_FAILURE);
  }
    
  char* path = argv[1];
  int count = atoi(argv[2]);
  char buffer[100];
  int rand_i, lc=0;
  char c=0;
  FILE* rand = NULL;
  FILE* fp = NULL;
  
  /* for extra entropy use /dev/random */
  if(!(rand = fopen("/dev/urandom", "r"))) { 
    printf("Failed to open /dev/urandom\n");
    exit(EXIT_FAILURE);
  }
  if(!(fp = fopen(path, "r"))) {
    printf("Failed to open %s\n", path);
    exit(EXIT_FAILURE);
  }
  
  /* get number of lines */
  while ((c = getc(fp)) != EOF) {
    if ( c=='\n')
      lc++;
  }
  rewind(fp);
  
  /* find 'count' number of words and output them */
  while(count--) {
    fread(&rand_i, sizeof(rand_i), 1, rand);
    if (rand_i<0)
      rand_i = -rand_i;
    rand_i = (rand_i % lc);
    int pos = 0;
    while(pos<rand_i) {
      c = getc(fp);
      if ( c=='\n')
	pos++;
    }
    c = 'a';
    while((c=getc(fp)) && c!='\n'){
      putchar(c);
    }
    putchar(' ');
    rewind(fp);
  }
  
  putchar('\n');
  fclose(fp);
  fclose(rand);
  return 0;
}