eliminate use of the `register' keyword: let the compiler decide

[moira.git] / update / hostname.c

/*
 *	$Source$
 *	$Header$
 */
/*  (c) Copyright 1988 by the Massachusetts Institute of Technology. */
/*  For copying and distribution information, please see the file */
/*  <mit-copyright.h>. */

#ifndef lint
static char *rcsid_hostname_c = "$Header$";
#endif	lint

/* PrincipalHostname, borrowed from rcmd.c in Kerberos code */
#include <mit-copyright.h>
#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <ctype.h>
#include <string.h>

char *PrincipalHostname(char *alias)
{
  struct hostent *h;
  char *phost = alias;
  if ((h = gethostbyname(alias)))
    {
      char *p = strchr(h->h_name, '.');
      if (p)
	*p = NULL;
      p = phost = h->h_name;
      do
	{
	  if (isupper(*p))
	    *p = tolower(*p);
	}
      while (*p++);
    }
  return phost;
}