libbib/common.cc

   1 /* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
   2      Written by James Clark (jjc@jclark.com)
   3
   4 This file is part of groff.
   5
   6 groff is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License along
  17 with groff; see the file COPYING.  If not, write to the Free Software
  18 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  19
  20 unsigned 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