programs/elem-hash.h

/* Copyright (C) 1999-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Written by Ulrich Drepper, <drepper@cygnus.com>.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

/* Branched from glibc's locale/elem-hash.h.  */

#include <stdint.h>

/* The hashing function used for the table with collation symbols.  */
static int32_t __attribute__((pure, unused))
elem_hash(const char *str, int_fast32_t n) {
  int32_t result = n;

  while (n-- > 0) {
    result <<= 3;
    result += *str++;
  }

  return result;
}