blob: 007f192a2373a18b43013a8d593c8bffaadb4b9b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/* Compute hash alue for given string according to ELF standard.
Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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. */
#ifndef _DL_HASH_H
#define _DL_HASH_H 1
/* This is the hashing function specified by the ELF ABI. In the
first five operations now overflow is possible so we optimized it a
bit. */
static inline unsigned
_dl_elf_hash (const char *name)
{
unsigned long int hash = 0;
if (*name != '\0')
{
hash = (hash << 4) + *name++;
if (*name != '\0')
{
hash = (hash << 4) + *name++;
if (*name != '\0')
{
hash = (hash << 4) + *name++;
if (*name != '\0')
{
hash = (hash << 4) + *name++;
if (*name != '\0')
{
hash = (hash << 4) + *name++;
while (*name != '\0')
{
unsigned long int hi;
hash = (hash << 4) + *name++;
hi = hash & 0xf0000000;
if (hi != 0)
{
hash ^= hi >> 24;
/* The ELF ABI says `hash &= ~hi', but
this is equivalent in this case and
on some machines one insn instead of
two. */
hash ^= hi;
}
}
}
}
}
}
}
return hash;
}
#endif /* dl-hash.h */
|