external/bsd/elftoolchain/dist/libelf/elf_hash.c

   1 /*      $NetBSD: elf_hash.c,v 1.2 2014/03/09 16:58:04 christos Exp $    */
   2
   3 /*-
   4  * Copyright (c) 2006,2008 Joseph Koshy
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30
  31 #include <libelf.h>
  32
  33 #include "_libelf.h"
  34
  35 __RCSID("$NetBSD: elf_hash.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  36 ELFTC_VCSID("Id: elf_hash.c 2225 2011-11-26 18:55:54Z jkoshy ");
  37
  38 /*
  39  * This elf_hash function is defined by the System V ABI.
  40  */
  41
  42 unsigned long
  43 elf_hash(const void *name)
  44 {
  45         unsigned long h, t;
  46         const unsigned char *s;
  47
  48         s = (const unsigned char *) name;
  49         h = t = 0;
  50
  51         for (; *s != '\0'; h = h & ~t) {
  52                 h = (h << 4) + *s++;
  53                 t = h & 0xF0000000UL;
  54                 if (t)
  55                         h ^= t >> 24;
  56         }
  57
  58         return (h);
  59 }