Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/dhcpd/hash.c	Lines:	0	46	0.0 %
Date:	2017-11-13	Branches:	0	36	0.0 %


/*	$OpenBSD: hash.c,v 1.8 2017/02/13 19:13:14 krw 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 <sys/types.h>
#include <sys/socket.h>

#include <net/if.h>

#include <netinet/in.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "dhcp.h"
#include "tree.h"
#include "dhcpd.h"
#include "log.h"

static int do_hash(unsigned char *, int, int);

struct hash_table *
new_hash(void)
{
	struct hash_table *rv;

	rv = calloc(1, sizeof(struct hash_table));
	if (!rv)
		log_warnx("No memory for new hash.");
	else
		rv->hash_count = DEFAULT_HASH_SIZE;

	return (rv);
}

static int
do_hash(unsigned char *name, int len, int size)
{
	int accum = 0;
	unsigned char *s = name;
	int 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)
{
	int hashno;
	struct hash_bucket *bp;

	if (!table)
		return;
	if (!len)
		len = strlen((char *)name);

	hashno = do_hash(name, len, table->hash_count);
	bp = calloc(1, sizeof(struct hash_bucket));
	if (!bp) {
		log_warnx("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(struct hash_table *table, unsigned char *name, int len)
{
	int hashno;
	struct hash_bucket *bp, *pbp = NULL;

	if (!table)
		return;
	if (!len)
		len = strlen((char *)name);

	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((char *)bp->name, (char *)name)) ||
		    (bp->len == len && !memcmp(bp->name, name, len))) {
			if (pbp)
				pbp->next = bp->next;
			else
				table->buckets[hashno] = bp->next;
			free(bp);
			break;
		}
		pbp = bp;	/* jwg, 9/6/96 - nice catch! */
	}
}

unsigned char *
hash_lookup(struct hash_table *table, unsigned char *name, int len)
{
	int hashno;
	struct hash_bucket *bp;

	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);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: hash.c,v 1.8 2017/02/13 19:13:14 krw Exp $ */
2
3			/* Routines for manipulating hash tables... */
4
5			/*
6			* Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium.
7			* All rights reserved.
8			*
9			* Redistribution and use in source and binary forms, with or without
10			* modification, are permitted provided that the following conditions
11			* are met:
12			*
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in the
17			* documentation and/or other materials provided with the distribution.
18			* 3. Neither the name of The Internet Software Consortium nor the names
19			* of its contributors may be used to endorse or promote products derived
20			* from this software without specific prior written permission.
21			*
22			* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
23			* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
24			* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25			* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26			* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
27			* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28			* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
29			* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
30			* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
31			* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32			* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
33			* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34			* SUCH DAMAGE.
35			*
36			* This software has been written for the Internet Software Consortium
37			* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
38			* Enterprises. To learn more about the Internet Software Consortium,
39			* see ``http://www.vix.com/isc''. To learn more about Vixie
40			* Enterprises, see ``http://www.vix.com''.
41			*/
42
43			#include <sys/types.h>
44			#include <sys/socket.h>
45
46			#include <net/if.h>
47
48			#include <netinet/in.h>
49
50			#include <stdio.h>
51			#include <stdlib.h>
52			#include <string.h>
53
54			#include "dhcp.h"
55			#include "tree.h"
56			#include "dhcpd.h"
57			#include "log.h"
58
59			static int do_hash(unsigned char *, int, int);
60
61			struct hash_table *
62			new_hash(void)
63			{
64			struct hash_table *rv;
65
66			rv = calloc(1, sizeof(struct hash_table));
67			if (!rv)
68			log_warnx("No memory for new hash.");
69			else
70			rv->hash_count = DEFAULT_HASH_SIZE;
71
72			return (rv);
73			}
74
75			static int
76			do_hash(unsigned char *name, int len, int size)
77			{
78			int accum = 0;
79			unsigned char *s = name;
80			int i = len;
81
82			while (i--) {
83			/* Add the character in... */
84			accum += *s++;
85			/* Add carry back in... */
86			while (accum > 255)
87			accum = (accum & 255) + (accum >> 8);
88			}
89			return (accum % size);
90			}
91
92			void add_hash(struct hash_table table, unsigned char name, int len,
93			unsigned char *pointer)
94			{
95			int hashno;
96			struct hash_bucket *bp;
97
98			if (!table)
99			return;
100			if (!len)
101			len = strlen((char *)name);
102
103			hashno = do_hash(name, len, table->hash_count);
104			bp = calloc(1, sizeof(struct hash_bucket));
105			if (!bp) {
106			log_warnx("Can't add %s to hash table.", name);
107			return;
108			}
109			bp->name = name;
110			bp->value = pointer;
111			bp->next = table->buckets[hashno];
112			bp->len = len;
113			table->buckets[hashno] = bp;
114			}
115
116			void
117			delete_hash_entry(struct hash_table table, unsigned char name, int len)
118			{
119			int hashno;
120			struct hash_bucket bp, pbp = NULL;
121
122			if (!table)
123			return;
124			if (!len)
125			len = strlen((char *)name);
126
127			hashno = do_hash(name, len, table->hash_count);
128
129			/*
130			* Go through the list looking for an entry that matches; if we
131			* find it, delete it.
132			*/
133			for (bp = table->buckets[hashno]; bp; bp = bp->next) {
134			if ((!bp->len &&
135			!strcmp((char )bp->name, (char )name)) \|\|
136			(bp->len == len && !memcmp(bp->name, name, len))) {
137			if (pbp)
138			pbp->next = bp->next;
139			else
140			table->buckets[hashno] = bp->next;
141			free(bp);
142			break;
143			}
144			pbp = bp; /* jwg, 9/6/96 - nice catch! */
145			}
146			}
147
148			unsigned char *
149			hash_lookup(struct hash_table table, unsigned char name, int len)
150			{
151			int hashno;
152			struct hash_bucket *bp;
153
154			if (!table)
155			return (NULL);
156
157			if (!len)
158			len = strlen((char *)name);
159
160			hashno = do_hash(name, len, table->hash_count);
161
162			for (bp = table->buckets[hashno]; bp; bp = bp->next)
163			if (len == bp->len && !memcmp(bp->name, name, len))
164			return (bp->value);
165
166			return (NULL);
167			}