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Member "tin-2.4.1/intl/hash-string.h" (28 Aug 2013, 1835 Bytes) of package /linux/misc/tin-2.4.1.tar.gz:


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    1 /* Description of GNU message catalog format: string hashing function.
    2    Copyright (C) 1995, 1997, 1998, 2000, 2001 Free Software Foundation, Inc.
    3 
    4    This program is free software; you can redistribute it and/or modify it
    5    under the terms of the GNU Library General Public License as published
    6    by the Free Software Foundation; either version 2, or (at your option)
    7    any later version.
    8 
    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 GNU
   12    Library General Public License for more details.
   13 
   14    You should have received a copy of the GNU Library General Public
   15    License along with this program; if not, write to the Free Software
   16    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   17    USA.  */
   18 
   19 /* @@ end of prolog @@ */
   20 
   21 #ifndef PARAMS
   22 # if __STDC__
   23 #  define PARAMS(Args) Args
   24 # else
   25 #  define PARAMS(Args) ()
   26 # endif
   27 #endif
   28 
   29 /* We assume to have `unsigned long int' value with at least 32 bits.  */
   30 #define HASHWORDBITS 32
   31 
   32 
   33 /* Defines the so called `hashpjw' function by P.J. Weinberger
   34    [see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
   35    1986, 1987 Bell Telephone Laboratories, Inc.]  */
   36 static unsigned long int hash_string PARAMS ((const char *__str_param));
   37 
   38 static inline unsigned long int
   39 hash_string (str_param)
   40      const char *str_param;
   41 {
   42   unsigned long int hval, g;
   43   const char *str = str_param;
   44 
   45   /* Compute the hash value for the given string.  */
   46   hval = 0;
   47   while (*str != '\0')
   48     {
   49       hval <<= 4;
   50       hval += (unsigned long int) *str++;
   51       g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
   52       if (g != 0)
   53     {
   54       hval ^= g >> (HASHWORDBITS - 8);
   55       hval ^= g;
   56     }
   57     }
   58   return hval;
   59 }