text: #include <u.h>
  #include <libc.h>
  #include <venti.h>
  
  VtConn*
  vtdial(char *addr)
  {
  	char *na;
  	int fd;
  	VtConn *z;
  
  	if(addr == nil)
  		addr = getenv("venti");
  	if(addr == nil)
  		addr = "$venti";
  
  	na = netmkaddr(addr, "tcp", "venti");
  	if((fd = dial(na, nil, nil, nil)) < 0)
  		return nil;
  
  	z = vtconn(fd, fd);
  	if(z)
  		strecpy(z->addr, z->addr+sizeof z->addr, na);
  	return z;
  }
  