gnu/dist/groff/src/libs/libbib/common.cpp

   1 /*      $NetBSD$        */
   2
   3 /* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
   4      Written by James Clark (jjc@jclark.com)
   5
   6 This file is part of groff.
   7
   8 groff is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License along
  19 with groff; see the file COPYING.  If not, write to the Free Software
  20 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  21
  22 unsigned hash(const char *s, int len)
  23 {
  24 #if 0
  25   unsigned h = 0, g;
  26   while (*s != '\0') {
  27     h <<= 4;
  28     h += *s++;
  29     if ((g = h & 0xf0000000) != 0) {
  30       h ^= g >> 24;
  31       h ^= g;
  32     }
  33   }
  34 #endif
  35   unsigned h = 0;
  36   while (--len >= 0)
  37     h = *s++ + 65587*h;
  38   return h;
  39 }
  40