glibc/nis/nis_util.c

/* Copyright (c) 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <string.h>
#include <rpcsvc/nis.h>
#include "nis_intern.h"

fd_result *
__nis_finddirectory (directory_obj *dir, const_nis_name name)
{
  nis_error status;
  fd_args fd_args;
  fd_result *fd_res;

  fd_args.dir_name = strdup (name);
  fd_args.requester = nis_local_host();
  fd_res = calloc (1, sizeof (fd_result));
      
  if ((status = __do_niscall2 (dir->do_servers.do_servers_val, 
			       dir->do_servers.do_servers_len, 
			       NIS_FINDDIRECTORY, (xdrproc_t) xdr_fd_args,
			       (caddr_t) &fd_args, (xdrproc_t) xdr_fd_result,
			       (caddr_t) fd_res, 
			       NO_AUTHINFO|USE_DGRAM)) != NIS_SUCCESS)
    fd_res->status = status;
      
  return fd_res;
}

/* This is from libc/db/hash/hash_func.c, hash3 is static there */
/*
 * This is INCREDIBLY ugly, but fast.  We break the string up into 8 byte
 * units.  On the first time through the loop we get the "leftover bytes"
 * (strlen % 8).  On every other iteration, we perform 8 HASHC's so we handle
 * all 8 bytes.  Essentially, this saves us 7 cmp & branch instructions.  If
 * this routine is heavily used enough, it's worth the ugly coding.
 *
 * OZ's original sdbm hash
 */
unsigned long
__nis_hash (const void *keyarg, register size_t len)
{
  register const u_char *key;
  register size_t loop;
  register u_int32_t h;
  
#define HASHC   h = *key++ + 65599 * h
  
  h = 0;
  key = keyarg;
  if (len > 0) 
    {
      loop = (len + 8 - 1) >> 3;
      switch (len & (8 - 1)) 
	{
	case 0:
	  do {
	    HASHC;
	    /* FALLTHROUGH */
	  case 7:
	    HASHC;
	    /* FALLTHROUGH */
	  case 6:
	    HASHC;
	    /* FALLTHROUGH */
	  case 5:
	    HASHC;
	    /* FALLTHROUGH */
	  case 4:
	    HASHC;
	    /* FALLTHROUGH */
	  case 3:
	    HASHC;
	    /* FALLTHROUGH */
	  case 2:
	    HASHC;
	    /* FALLTHROUGH */
	  case 1:
	    HASHC;
	  } while (--loop);
	}
    }
  return (h);
}