OpenCores
URL https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk

Subversion Repositories openrisc_me

[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [iconv/] [hash-string.h] - Blame information for rev 207

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 207 jeremybenn
/* Implements a string hashing function.
2
   Copyright (C) 1995, 1997, 1998, 2000 Free Software Foundation, Inc.
3
   This file is part of the GNU C Library.
4
 
5
   The GNU C Library is free software; you can redistribute it and/or
6
   modify it under the terms of the GNU Lesser General Public
7
   License as published by the Free Software Foundation; either
8
   version 2.1 of the 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
   Lesser General Public License for more details.
14
 
15
   You should have received a copy of the GNU Lesser General Public
16
   License along with the GNU C Library; if not, write to the Free
17
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18
   02111-1307 USA.  */
19
 
20
/* @@ end of prolog @@ */
21
 
22
#ifndef PARAMS
23
# if __STDC__
24
#  define PARAMS(Args) Args
25
# else
26
#  define PARAMS(Args) ()
27
# endif
28
#endif
29
 
30
/* We assume to have `unsigned long int' value with at least 32 bits.  */
31
#define HASHWORDBITS 32
32
 
33
 
34
/* Defines the so called `hashpjw' function by P.J. Weinberger
35
   [see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
36
   1986, 1987 Bell Telephone Laboratories, Inc.]  */
37
static unsigned long int hash_string PARAMS ((const char *__str_param));
38
 
39
static inline unsigned long int
40
hash_string (str_param)
41
     const char *str_param;
42
{
43
  unsigned long int hval, g;
44
  const char *str = str_param;
45
 
46
  /* Compute the hash value for the given string.  */
47
  hval = 0;
48
  while (*str != '\0')
49
    {
50
      hval <<= 4;
51
      hval += (unsigned long int) *str++;
52
      g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
53
      if (g != 0)
54
        {
55
          hval ^= g >> (HASHWORDBITS - 8);
56
          hval ^= g;
57
        }
58
    }
59
  return hval;
60
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.