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radix.h
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C/C++ Source or Header
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1996-09-28
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4KB
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119 lines
/*
* Copyright (c) 1988, 1989 Regents of the University of California.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)radix.h 7.4 (Berkeley) 6/28/90
*/
/*
* Radix search tree node layout.
*/
struct radix_node {
struct radix_mask *rn_mklist; /* list of masks contained in subtree */
struct radix_node *rn_p; /* parent */
short rn_b; /* bit offset; -1-index(netmask) */
char rn_bmask; /* node: mask for bit test*/
u_char rn_flags; /* enumerated next */
#define RNF_NORMAL 1 /* leaf contains normal route */
#define RNF_ROOT 2 /* leaf is root leaf for tree */
#define RNF_ACTIVE 4 /* This node is alive (for rtfree) */
union {
struct { /* leaf only data: */
caddr_t rn_Key; /* object of search */
caddr_t rn_Mask; /* netmask, if present */
struct radix_node *rn_Dupedkey;
} rn_leaf;
struct { /* node only data: */
int rn_Off; /* where to start compare */
struct radix_node *rn_L;/* progeny */
struct radix_node *rn_R;/* progeny */
}rn_node;
} rn_u;
#ifdef RN_DEBUG
int rn_info;
struct radix_node *rn_twin;
struct radix_node *rn_ybro;
#endif
};
#define MAXKEYLEN 32
#define rn_dupedkey rn_u.rn_leaf.rn_Dupedkey
#define rn_key rn_u.rn_leaf.rn_Key
#define rn_mask rn_u.rn_leaf.rn_Mask
#define rn_off rn_u.rn_node.rn_Off
#define rn_l rn_u.rn_node.rn_L
#define rn_r rn_u.rn_node.rn_R
/*
* Annotations to tree concerning potential routes applying to subtrees.
*/
extern struct radix_mask {
short rm_b; /* bit offset; -1-index(netmask) */
char rm_unused; /* cf. rn_bmask */
u_char rm_flags; /* cf. rn_flags */
struct radix_mask *rm_mklist; /* more masks to try */
caddr_t rm_mask; /* the mask */
int rm_refs; /* # of references to this struct */
} *rn_mkfreelist;
#define MKGet(m) {\
if (rn_mkfreelist) {\
m = rn_mkfreelist; \
rn_mkfreelist = (m)->rm_mklist; \
} else \
R_Malloc(m, struct radix_mask *, sizeof (*(m))); }\
#define MKFree(m) { (m)->rm_mklist = rn_mkfreelist; rn_mkfreelist = (m);}
extern struct radix_node_head {
struct radix_node_head *rnh_next;
struct radix_node *rnh_treetop;
int rnh_af;
struct radix_node rnh_nodes[3];
} *radix_node_head;
#ifndef _KERNEL
#define Bcmp(a, b, n) bcmp(((char *)(a)), ((char *)(b)), (n))
#define Bzero(p, n) bzero((char *)(p), (int)(n));
#define R_Malloc(p, t, n) (p = (t) malloc((unsigned int)(n)))
#define Free(p) free((char *)p);
#else
#define Bcmp(a, b, n) bcmp(((caddr_t)(a)), ((caddr_t)(b)), (unsigned)(n))
#define Bcopy(a, b, n) bcopy(((caddr_t)(a)), ((caddr_t)(b)), (unsigned)(n))
#define Bzero(p, n) bzero((caddr_t)(p), (unsigned)(n));
#define R_Malloc(p, t, n) (p = (t) malloc((unsigned long)(n), M_RTABLE, M_DONTWAIT))
#define Free(p) free((caddr_t)p, M_RTABLE);
#endif /*_KERNEL*/