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📄 Makefile.inc(2.73 KB)
📄 Symbol.map(1.38 KB)
📄 _Exit.c(529 B)
📄 a64l.3(4.79 KB)
📄 a64l.c(846 B)
📄 abort.3(2.55 KB)
📄 abort.c(2.76 KB)
📄 abs.3(2.36 KB)
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📄 alloca.3(2.8 KB)
📄 at_quick_exit.3(2.12 KB)
📄 atexit.3(3.25 KB)
📄 atexit.c(6.73 KB)
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📄 atof.3(2.77 KB)
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📄 atoi.c(2.16 KB)
📄 atol.3(3.16 KB)
📄 atol.c(2.17 KB)
📄 atoll.c(2.05 KB)
📄 bsearch.3(4.53 KB)
📄 bsearch.c(3.35 KB)
📄 bsearch_b.c(1.38 KB)
📄 cxa_thread_atexit.c(1.67 KB)
📄 cxa_thread_atexit_impl.c(4.63 KB)
📄 div.3(2.22 KB)
📄 div.c(3 KB)
📄 exit.3(3.66 KB)
📄 exit.c(2.72 KB)
📄 getenv.3(5.32 KB)
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📄 getopt.c(4.22 KB)
📄 getopt_long.3(11.45 KB)
📄 getopt_long.c(16.41 KB)
📄 getsubopt.3(3.98 KB)
📄 getsubopt.c(3.13 KB)
📄 hcreate.3(7.04 KB)
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📄 hcreate_r.c(2.27 KB)
📄 hdestroy_r.c(1.6 KB)
📄 heapsort.c(6.63 KB)
📄 heapsort_b.c(1.38 KB)
📄 hsearch.h(1.63 KB)
📄 hsearch_r.c(4.36 KB)
📄 imaxabs.3(1.92 KB)
📄 imaxabs.c(1.52 KB)
📄 imaxdiv.3(2.09 KB)
📄 imaxdiv.c(1.81 KB)
📄 insque.3(1.13 KB)
📄 insque.c(925 B)
📁 jemalloc
📄 l64a.c(726 B)
📄 labs.3(2.28 KB)
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📄 llabs.c(1.52 KB)
📄 lldiv.3(2.08 KB)
📄 lldiv.c(1.8 KB)
📄 lsearch.3(2.9 KB)
📄 lsearch.c(1.47 KB)
📄 memory.3(2.48 KB)
📄 merge.c(9.27 KB)
📄 mergesort_b.c(1.38 KB)
📄 ptsname.3(4.64 KB)
📄 ptsname.c(3.29 KB)
📄 qsort.3(9.67 KB)
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📄 qsort_r.c(430 B)
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📄 quick_exit.3(2.13 KB)
📄 quick_exit.c(2.53 KB)
📄 radixsort.3(4.35 KB)
📄 radixsort.c(7.89 KB)
📄 rand.3(4.31 KB)
📄 rand.c(4.58 KB)
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📄 random.h(2.91 KB)
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📄 realpath.3(3.73 KB)
📄 realpath.c(6.32 KB)
📄 remque.c(581 B)
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📄 set_constraint_handler_s.c(2.91 KB)
📄 strfmon.3(4.83 KB)
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📄 strtoimax.c(4.77 KB)
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📄 strtoll.c(4.77 KB)
📄 strtonum.3(3.45 KB)
📄 strtonum.c(1.79 KB)
📄 strtoq.c(1.97 KB)
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📄 strtoumax.c(3.72 KB)
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📄 system.3(3.09 KB)
📄 system.c(3.8 KB)
📄 tdelete.c(5.53 KB)
📄 tfind.c(1.06 KB)
📄 tsearch.3(5.43 KB)
📄 tsearch.c(5.01 KB)
📄 tsearch_path.h(2.8 KB)
📄 twalk.c(1.18 KB)

Editing: tsearch_path.h

/*-
 * Copyright (c) 2015 Nuxi, https://nuxi.nl/
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD$
 */

#ifndef TSEARCH_PATH_H
#define	TSEARCH_PATH_H

#include <limits.h>
#include <stdbool.h>
#include <stdint.h>

/*
 * Bookkeeping for storing a path in a balanced binary search tree from
 * the root to a leaf node.
 *
 * For an AVL tree we know that its maximum height of a tree is bounded
 * by approximately 1.44 * log2(n) - 0.328. Given that the number of
 * entries of the tree is constrained by the size of the address space,
 * two uintptr_t's provide sufficient space to store the path from the
 * root to any leaf.
 */
struct path {
	uintptr_t steps[2];
	unsigned int nsteps;
};

/* Initializes the path structure with a zero-length path. */
static inline void
path_init(struct path *p)
{

p->nsteps = 0;
}

#define	STEPS_BIT (sizeof(uintptr_t) * CHAR_BIT)

/* Pushes a step to the left to the end of the path. */
static inline void
path_taking_left(struct path *p)
{

p->steps[p->nsteps / STEPS_BIT] |=
	    (uintptr_t)1 << (p->nsteps % STEPS_BIT);
	++p->nsteps;
}

/* Pushes a step to the right to the end of the path. */
static inline void
path_taking_right(struct path *p)
{

p->steps[p->nsteps / STEPS_BIT] &=
	    ~((uintptr_t)1 << (p->nsteps % STEPS_BIT));
	++p->nsteps;
}

/*
 * Pops the first step from the path and returns whether it was a step
 * to the left.
 */
static inline bool
path_took_left(struct path *p)
{
	bool result;

result = p->steps[0] & 0x1;
	p->steps[0] = (p->steps[0] >> 1) | (p->steps[1] << (STEPS_BIT - 1));
	p->steps[1] >>= 1;
	return (result);
}

#undef STEPS_BIT

#endif

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