exit(1);
return FALSE;
static void move(char *from, char *to){    int ret;    ret = rename(from, to);    if (ret) {	/*	 * This OS may require us to remove the original file first.	 */	remove(to);	ret = rename(from, to);    }    if (ret) {	perror("puttygen: cannot move new file on to old one");	exit(1);    }}