#include <stdio.h>

int l4_write_string(char *);
int l4_write_estring(char *s);
int l4_read_string(char *, int);
int l4_read_estring(char *, int);

int main(int argc,char **argv) {
  char buf[1000];

  if (argc!=3) {

    // I'm a reader - read the username
    if (l4_read_string(buf,999)==-1) {
      fprintf(stderr,"Reading error\n");
      exit(1);
    } 
    printf("Username: %s\n",buf);

    // now get the password
    if (l4_read_estring(buf,999)==-1) {
      fprintf(stderr,"Reading error\n");
      exit(1);
    } 
    printf("Password: %s\n",buf);

  } else {
    // I'm a writer - first send argv[1] as plain text

    if (l4_write_string(argv[1])==-1) {
      fprintf(stderr,"error sending username\n");
      exit(1);
    }

    // now send second parameter scrambled

    if (l4_write_estring(argv[2])==-1) {
      fprintf(stderr,"error sending password\n");
      exit(1);
    }

  }
  return(0);
}