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Diffstat (limited to 'common/hash.c')
| -rw-r--r-- | common/hash.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/common/hash.c b/common/hash.c deleted file mode 100644 index 668c4cfd..00000000 --- a/common/hash.c +++ /dev/null @@ -1,173 +0,0 @@ -/* hash.c - - Routines for manipulating hash tables... */ - -/* - * Copyright (c) 1995, 1996 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''. - */ - -#ifndef lint -static char copyright[] = -"$Id: hash.c,v 1.8 1996/08/28 01:39:20 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n"; -#endif /* not lint */ - -#include "dhcpd.h" - -static INLINE int do_hash PROTO ((char *, int, int)); - -struct hash_table *new_hash () -{ - struct hash_table *rv = new_hash_table (DEFAULT_HASH_SIZE, "new_hash"); - if (!rv) - return rv; - memset (&rv -> buckets [0], 0, - DEFAULT_HASH_SIZE * sizeof (struct hash_bucket *)); - return rv; -} - -static INLINE int do_hash (name, len, size) - char *name; - int len; - int size; -{ - register int accum = 0; - register unsigned char *s = (unsigned char *)name; - int i = len; - if (i) { - while (i--) { - /* Add the character in... */ - accum += *s++; - /* Add carry back in... */ - while (accum > 255) { - accum = (accum & 255) + (accum >> 8); - } - } - } else { - while (*s) { - /* Add the character in... */ - accum += *s++; - /* Add carry back in... */ - while (accum > 255) { - accum = (accum & 255) + (accum >> 8); - } - } - } - return accum % size; -} - -void add_hash (table, name, len, pointer) - struct hash_table *table; - int len; - char *name; - unsigned char *pointer; -{ - int hashno; - struct hash_bucket *bp; - - if (!table) - return; - - hashno = do_hash (name, len, table -> hash_count); - bp = new_hash_bucket ("add_hash"); - - if (!bp) { - warn ("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 delete_hash_entry (table, name, len) - struct hash_table *table; - int len; - char *name; -{ - int hashno; - struct hash_bucket *bp, *pbp = (struct hash_bucket *)0; - - if (!table) - return; - - hashno = do_hash (name, len, table -> hash_count); - - /* Go through the list looking for an entry that matches; - if we find it, delete it. */ - for (bp = table -> buckets [hashno]; bp; bp = bp -> next) { - if ((!bp -> len && !strcmp (bp -> name, name)) || - (bp -> len == len && - !memcmp (bp -> name, name, len))) { - if (pbp) { - pbp -> next = bp -> next; - } else { - table -> buckets [hashno] = bp -> next; - } - free_hash_bucket (bp, "delete_hash_entry"); - break; - } - } -} - -unsigned char *hash_lookup (table, name, len) - struct hash_table *table; - char *name; - int len; -{ - int hashno; - struct hash_bucket *bp; - - if (!table) - return (unsigned char *)0; - hashno = do_hash (name, len, table -> hash_count); - - if (len) { - for (bp = table -> buckets [hashno]; bp; bp = bp -> next) { - if (len == bp -> len - && !memcmp (bp -> name, name, len)) - return bp -> value; - } - } else { - for (bp = table -> buckets [hashno]; bp; bp = bp -> next) - if (!strcmp (bp -> name, name)) - return bp -> value; - } - return (unsigned char *)0; -} - |