diff options
author | Brooks Davis <brooks@FreeBSD.org> | 2005-06-07 04:05:09 +0000 |
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committer | Brooks Davis <brooks@FreeBSD.org> | 2005-06-07 04:05:09 +0000 |
commit | 47c0859616bfefdd59ce6bbd8dd46882cef4527a (patch) | |
tree | 3bf6776f442e91d5582a49f3dce940772d56aaed /sbin/dhclient/hash.c | |
parent | a9c7144e7ac71a1a3ffaedcde30bf1e0a82f98bd (diff) | |
download | src-47c0859616bfefdd59ce6bbd8dd46882cef4527a.tar.gz src-47c0859616bfefdd59ce6bbd8dd46882cef4527a.zip |
Import the OpenBSD dhclient as shipped with OpenBSD-3.7 (the tag
OPENBSD_3_7).
Notes
Notes:
svn path=/vendor/OpenBSD/dist/; revision=147072
Diffstat (limited to 'sbin/dhclient/hash.c')
-rw-r--r-- | sbin/dhclient/hash.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/sbin/dhclient/hash.c b/sbin/dhclient/hash.c new file mode 100644 index 000000000000..4f1795b24351 --- /dev/null +++ b/sbin/dhclient/hash.c @@ -0,0 +1,119 @@ +/* $OpenBSD: hash.c,v 1.9 2004/05/10 15:30:47 deraadt Exp $ */ + +/* Routines for manipulating hash tables... */ + +/* + * 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 "dhcpd.h" + +static int do_hash(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(unsigned char *name, int len, int size) +{ + 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, unsigned char *name, int len, + unsigned char *pointer) +{ + struct hash_bucket *bp; + int hashno; + + if (!table) + return; + if (!len) + len = strlen((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; +} + +unsigned char * +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); +} |