82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
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/* $NetBSD: hash.c,v 1.1 2023/07/30 09:20:14 riastradh Exp $ */
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/*
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* Copyright 1996 John D. Polstra.
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* Copyright 1996 Matt Thomas <matt@3am-software.com>
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* Copyright 2002 Charles M. Hannum <root@ihack.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Polstra.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Dynamic linker for ELF.
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*
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* John Polstra <jdp@polstra.com>.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: hash.c,v 1.1 2023/07/30 09:20:14 riastradh Exp $");
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#endif /* not lint */
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#include <stdint.h>
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#include "hash.h"
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/*
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* SysV hash function for symbol table lookup. It is a slightly optimized
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* version of the hash specified by the System V ABI.
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*/
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Elf32_Word
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_rtld_sysv_hash(const char *name)
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{
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const unsigned char *p = (const unsigned char *) name;
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Elf32_Word h = 0;
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while (__predict_true(*p != '\0')) {
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h = (h << 4) + *p++;
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h ^= (h >> 24) & 0xf0;
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}
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return (h & 0x0fffffff);
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}
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/*
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* Hash function for symbol table lookup. Don't even think about changing
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* this. It is specified by the GNU toolchain ABI.
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*/
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Elf32_Word
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_rtld_gnu_hash(const char *name)
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{
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const unsigned char *p = (const unsigned char *) name;
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uint_fast32_t h = 5381;
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unsigned char c;
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for (c = *p; c != '\0'; c = *++p)
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h = h * 33 + c;
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return (h & 0xffffffff);
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}
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