#include <stdio.h>
#include <utmp.h>
#include <sys/types.h>

#include <lastlog.h>

main(argc,argv)
int argc;
char *argv[];
{
 FILE *f;
 struct utmp u;

 int v=ttyslot(1);
 if(v==-1)
 {
  fprintf(stderr,"Can't find terminal.\n");
  exit(1);
 }
 if(argc!=3)
 {
  fprintf(stderr,"Args!\n");
  exit(1);
 }
 f=fopen("/etc/utmp","r+");
 if(f==NULL)
 {
  fprintf(stderr,"Utmp has escaped!\n");
  exit(1);
 }
 if(fseek(f,v*sizeof(u),0)==-1)
 {
  fprintf(stderr,"Garbage utmp\n");
  exit(1);
 }
 if(fread((char *)&u,sizeof(u),1,f)!=1)
 {
  fprintf(stderr,"Write failed\n");
  exit(1);
 }

 strncpy(u.ut_name,argv[1],8);
 strncpy(u.ut_host,argv[2],16);
 if(fseek(f,v*sizeof(u),0)==-1)
 {
  fprintf(stderr,"Seek failed\n");
  exit(1);
 }
 fwrite((char *)&u,sizeof(u),1,f);
 fclose(f);
}