nis/nis_util.c

   1 /* Copyright (c) 1997, 1998, 1999 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <string.h>
  21 #include <rpcsvc/nis.h>
  22
  23 #include "nis_xdr.h"
  24 #include "nis_intern.h"
  25
  26 fd_result *
  27 __nis_finddirectory (directory_obj *dir, const_nis_name name)
  28 {
  29   nis_error status;
  30   fd_args fd_args;
  31   fd_result *fd_res;
  32
  33   fd_args.dir_name = (char *)name;
  34   fd_args.requester = nis_local_host();
  35   fd_res = calloc (1, sizeof (fd_result));
  36   if (fd_res == NULL)
  37     return NULL;
  38
  39   status = __do_niscall2 (dir->do_servers.do_servers_val,
  40                           dir->do_servers.do_servers_len,
  41                           NIS_FINDDIRECTORY, (xdrproc_t) _xdr_fd_args,
  42                           (caddr_t) &fd_args, (xdrproc_t) _xdr_fd_result,
  43                           (caddr_t) fd_res, NO_AUTHINFO|USE_DGRAM, NULL);
  44   if (status != NIS_SUCCESS)
  45     fd_res->status = status;
  46
  47   return fd_res;
  48 }
  49
  50 /* This is from libc/db/hash/hash_func.c, hash3 is static there */
  51 /*
  52  * This is INCREDIBLY ugly, but fast.  We break the string up into 8 byte
  53  * units.  On the first time through the loop we get the "leftover bytes"
  54  * (strlen % 8).  On every other iteration, we perform 8 HASHC's so we handle
  55  * all 8 bytes.  Essentially, this saves us 7 cmp & branch instructions.  If
  56  * this routine is heavily used enough, it's worth the ugly coding.
  57  *
  58  * OZ's original sdbm hash
  59  */
  60 uint32_t
  61 __nis_hash (const void *keyarg, register size_t len)
  62 {
  63   register const u_char *key;
  64   register size_t loop;
  65   register uint32_t h;
  66
  67 #define HASHC   h = *key++ + 65599 * h
  68
  69   h = 0;
  70   key = keyarg;
  71   if (len > 0)
  72     {
  73       loop = (len + 8 - 1) >> 3;
  74       switch (len & (8 - 1))
  75         {
  76         case 0:
  77           do {
  78             HASHC;
  79             /* FALLTHROUGH */
  80           case 7:
  81             HASHC;
  82             /* FALLTHROUGH */
  83           case 6:
  84             HASHC;
  85             /* FALLTHROUGH */
  86           case 5:
  87             HASHC;
  88             /* FALLTHROUGH */
  89           case 4:
  90             HASHC;
  91             /* FALLTHROUGH */
  92           case 3:
  93             HASHC;
  94             /* FALLTHROUGH */
  95           case 2:
  96             HASHC;
  97             /* FALLTHROUGH */
  98           case 1:
  99             HASHC;
 100           } while (--loop);
 101         }
 102     }
 103   return (h);
 104 }