1 /* Implements a string hashing function.
2 Copyright (C) 1995, 1997 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
23 /* @@ end of prolog @@ */
27 # define PARAMS(Args) Args
29 # define PARAMS(Args) ()
33 /* We assume to have `unsigned long int' value with at least 32 bits. */
34 #define HASHWORDBITS 32
37 /* Defines the so called `hashpjw' function by P.J. Weinberger
38 [see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
39 1986, 1987 Bell Telephone Laboratories, Inc.] */
40 static unsigned long hash_string
PARAMS ((const char *__str_param
));
42 static inline unsigned long
43 hash_string (str_param
)
44 const char *str_param
;
46 unsigned long int hval
, g
;
47 const char *str
= str_param
;
49 /* Compute the hash value for the given string. */
54 hval
+= (unsigned long) *str
++;
55 g
= hval
& ((unsigned long) 0xf << (HASHWORDBITS
- 4));
58 hval
^= g
>> (HASHWORDBITS
- 8);
This page took 0.030174 seconds and 4 git commands to generate.