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[glibc.git] / nis / nis_util.c
blob656b1a48c1d2a295f97e747facae24ddc2cbea30
1 /* Copyright (c) 1997, 1998 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
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.
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.
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. */
20 #include <string.h>
21 #include <rpcsvc/nis.h>
23 #include "nis_xdr.h"
24 #include "nis_intern.h"
26 fd_result *
27 __nis_finddirectory (directory_obj *dir, const_nis_name name)
29 nis_error status;
30 fd_args fd_args;
31 fd_result *fd_res;
33 fd_args.dir_name = strdup (name);
34 fd_args.requester = nis_local_host();
35 fd_res = calloc (1, sizeof (fd_result));
37 status = __do_niscall2 (dir->do_servers.do_servers_val,
38 dir->do_servers.do_servers_len,
39 NIS_FINDDIRECTORY, (xdrproc_t) _xdr_fd_args,
40 (caddr_t) &fd_args, (xdrproc_t) _xdr_fd_result,
41 (caddr_t) fd_res, NO_AUTHINFO|USE_DGRAM, NULL, NULL);
42 if (status != NIS_SUCCESS)
43 fd_res->status = status;
45 return fd_res;
48 /* This is from libc/db/hash/hash_func.c, hash3 is static there */
50 * This is INCREDIBLY ugly, but fast. We break the string up into 8 byte
51 * units. On the first time through the loop we get the "leftover bytes"
52 * (strlen % 8). On every other iteration, we perform 8 HASHC's so we handle
53 * all 8 bytes. Essentially, this saves us 7 cmp & branch instructions. If
54 * this routine is heavily used enough, it's worth the ugly coding.
56 * OZ's original sdbm hash
58 unsigned long
59 __nis_hash (const void *keyarg, register size_t len)
61 register const u_char *key;
62 register size_t loop;
63 register u_int32_t h;
65 #define HASHC h = *key++ + 65599 * h
67 h = 0;
68 key = keyarg;
69 if (len > 0)
71 loop = (len + 8 - 1) >> 3;
72 switch (len & (8 - 1))
74 case 0:
75 do {
76 HASHC;
77 /* FALLTHROUGH */
78 case 7:
79 HASHC;
80 /* FALLTHROUGH */
81 case 6:
82 HASHC;
83 /* FALLTHROUGH */
84 case 5:
85 HASHC;
86 /* FALLTHROUGH */
87 case 4:
88 HASHC;
89 /* FALLTHROUGH */
90 case 3:
91 HASHC;
92 /* FALLTHROUGH */
93 case 2:
94 HASHC;
95 /* FALLTHROUGH */
96 case 1:
97 HASHC;
98 } while (--loop);
101 return (h);