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Makefile.depend
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alloc.c
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clparse.c
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convert.c
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dhclient-script
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dhclient-script.8
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dhclient.8
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dhclient.c
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dhclient.conf.5
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dhclient.leases.5
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dhcp-options.5
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dhcp.h
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dhcpd.h
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dhctoken.h
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dispatch.c
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errwarn.c
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hash.c
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inet.c
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options.c
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packet.c
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parse.c
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privsep.c
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privsep.h
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tables.c
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tests
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tree.c
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tree.h
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Editing: hash.c
/* $OpenBSD: hash.c,v 1.9 2004/05/10 15:30:47 deraadt Exp $ */ /* Routines for manipulating hash tables... */ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of The Internet Software Consortium nor the names * of its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This software has been written for the Internet Software Consortium * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie * Enterprises. To learn more about the Internet Software Consortium, * see ``http://www.vix.com/isc''. To learn more about Vixie * Enterprises, see ``http://www.vix.com''. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include "dhcpd.h" static int do_hash(const unsigned char *, int, int); struct hash_table * new_hash(void) { struct hash_table *rv = new_hash_table(DEFAULT_HASH_SIZE); if (!rv) return (rv); memset(&rv->buckets[0], 0, DEFAULT_HASH_SIZE * sizeof(struct hash_bucket *)); return (rv); } static int do_hash(const unsigned char *name, int len, int size) { const unsigned char *s = name; int accum = 0, i = len; while (i--) { /* Add the character in... */ accum += *s++; /* Add carry back in... */ while (accum > 255) accum = (accum & 255) + (accum >> 8); } return (accum % size); } void add_hash(struct hash_table *table, const unsigned char *name, int len, unsigned char *pointer) { struct hash_bucket *bp; int hashno; if (!table) return; if (!len) len = strlen((const char *)name); hashno = do_hash(name, len, table->hash_count); bp = new_hash_bucket(); if (!bp) { warning("Can't add %s to hash table.", name); return; } bp->name = name; bp->value = pointer; bp->next = table->buckets[hashno]; bp->len = len; table->buckets[hashno] = bp; } void * hash_lookup(struct hash_table *table, unsigned char *name, int len) { struct hash_bucket *bp; int hashno; if (!table) return (NULL); if (!len) len = strlen((char *)name); hashno = do_hash(name, len, table->hash_count); for (bp = table->buckets[hashno]; bp; bp = bp->next) if (len == bp->len && !memcmp(bp->name, name, len)) return (bp->value); return (NULL); }
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