locale/elem-hash.h

   1 /* Copyright (C) 1999-2018 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Written by Ulrich Drepper, <drepper@cygnus.com>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19
  20 /* The hashing function used for the table with collation symbols.  */
  21 static int32_t __attribute__ ((pure, unused))
  22 elem_hash (const char *str, int_fast32_t n)
  23 {
  24   int32_t result = n;
  25
  26   while (n-- > 0)
  27     {
  28       result <<= 3;
  29       result += *str++;
  30     }
  31
  32   return result;
  33 }