/contrib/groff/src/libs/libbib/common.cpp

 1/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
 2     Written by James Clark (jjc@jclark.com)
 3
 4This file is part of groff.
 5
 6groff is free software; you can redistribute it and/or modify it under
 7the terms of the GNU General Public License as published by the Free
 8Software Foundation; either version 2, or (at your option) any later
 9version.
10
11groff is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License along
17with groff; see the file COPYING.  If not, write to the Free Software
18Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
19
20unsigned hash(const char *s, int len)
21{
22#if 0
23  unsigned h = 0, g;
24  while (*s != '\0') {
25    h <<= 4;
26    h += *s++;
27    if ((g = h & 0xf0000000) != 0) {
28      h ^= g >> 24;
29      h ^= g;
30    }
31  }
32#endif
33  unsigned h = 0;
34  while (--len >= 0)
35    h = *s++ + 65587*h;
36  return h;
37}
38