/* Compute and print the MD5 checksum of each
   word in the system dictionary. We can use
 "/usr/bin/md5sum" to compute one checksum.
*/

#include "csapp.h"

int main()
{
  FILE *f;
  char word[256];
  size_t len;

  f = fopen("/usr/share/dict/words", "r");
  while (fgets(word, sizeof(word), f))
  {
    len = strlen(word);
    if (len && word[len-1] == '\n')
      word[--len] = 0;

    /* We want to print the 32-character MD5 sum
       after each word and on the same line as the
       word: */
    printf("%s\n", word);
    
    {
      char *args[] = { "/usr/bin/md5sum", NULL };
      pid_t pid;
      int status, fds[2];

      Pipe(fds);
      pid = Fork();
      if (pid == 0) {
	Write(fds[1], word, strlen(word));
	Close(fds[1]);
	Dup2(fds[0], 0);
	Execve("/usr/bin/md5sum", args, environ);
      }
      Close(fds[0]);
      Close(fds[1]);
      Waitpid(pid, &status, 0);
    }
  }

  return 0;
}