locale/elem-hash.h

   1 /* Copyright (C) 1999-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18
  19 /* The hashing function used for the table with collation symbols.  */
  20 static int32_t __attribute__ ((pure, unused))
  21 elem_hash (const char *str, int_fast32_t n)
  22 {
  23   int32_t result = n;
  24
  25   while (n-- > 0)
  26     {
  27       result <<= 3;
  28       result += *str++;
  29     }
  30
  31   return result;
  32 }