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elinks/src/intl/gettext/hash-string.h
Petr Baudis 0f6d4310ad Initial commit of the HEAD branch of the ELinks CVS repository, as of
Thu Sep 15 15:57:07 CEST 2005. The previous history can be added to this
by grafting.
2005-09-15 15:58:31 +02:00

45 lines
1.6 KiB
C

/* Description of GNU message catalog format: string hashing function.
Copyright (C) 1995, 1997, 1998, 2000, 2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* We assume to have `unsigned long int' value with at least 32 bits. */
#define HASHWORDBITS 32
/* Defines the so called `hashpjw' function by P.J. Weinberger
[see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
1986, 1987 Bell Telephone Laboratories, Inc.] */
static unsigned long int hash_string(const unsigned char *__str_param);
static inline unsigned long int
hash_string(const unsigned char *str_param)
{
unsigned long int hval, g;
const unsigned char *str = str_param;
/* Compute the hash value for the given string. */
hval = 0;
while (*str != '\0') {
hval <<= 4;
hval += (unsigned long int) *str++;
g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
if (g != 0) {
hval ^= g >> (HASHWORDBITS - 8);
hval ^= g;
}
}
return hval;
}