1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/*-
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <atf-c.h>
#define _SEARCH_PRIVATE
#include <search.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
static int n_nodes = 0;
static int n_seen = 0;
/* Validates the integrity of an AVL tree. */
static inline unsigned int
tnode_assert(const posix_tnode *n)
{
unsigned int height_left, height_right;
int balance;
if (n == NULL)
return 0;
height_left = tnode_assert(n->llink);
height_right = tnode_assert(n->rlink);
balance = (int)height_left - (int)height_right;
ATF_CHECK(balance >= -1);
ATF_CHECK(balance <= 1);
ATF_CHECK_EQ(balance, n->balance);
return (height_left > height_right ? height_left : height_right) + 1;
}
static int
compar(const void *a, const void *b)
{
return *(int *)a - *(int *)b;
}
static void
treewalk(const posix_tnode *node, VISIT v, int level)
{
if (v == postorder || v == leaf)
n_seen++;
}
ATF_TC_WITHOUT_HEAD(tsearch_test);
ATF_TC_BODY(tsearch_test, tc)
{
/*
* Run the test below in a deterministic fashion to prevent this
* test from potentially flapping. We assume that this provides
* enough coverage.
*/
#if 0
unsigned short random_state[3];
arc4random_buf(random_state, sizeof(random_state));
#else
unsigned short random_state[3] = { 26554, 13330, 3246 };
#endif
#define NKEYS 1000
/* Create 1000 possible keys. */
int keys[NKEYS];
for (int i = 0; i < NKEYS; ++i)
keys[i] = i;
/* Apply random operations on a binary tree and check the results. */
posix_tnode *root = NULL;
bool present[NKEYS] = {};
for (int i = 0; i < NKEYS * 10; ++i) {
int key = nrand48(random_state) % NKEYS;
int sample = i;
/*
* Ensure each case is tested at least 10 times, plus a
* random sampling.
*/
if ((sample % NKEYS) > 3)
sample = nrand48(random_state) % 3;
switch (sample) {
case 0: /* tdelete(). */
if (present[key]) {
ATF_CHECK(tdelete(&key, &root, compar) != NULL);
present[key] = false;
ATF_CHECK(n_nodes > 0);
n_nodes--;
} else {
ATF_CHECK_EQ(NULL,
tdelete(&key, &root, compar));
}
break;
case 1: /* tfind(). */
if (present[key]) {
ATF_CHECK_EQ(&keys[key],
*(int **)tfind(&key, &root, compar));
} else {
ATF_CHECK_EQ(NULL, tfind(&key, &root, compar));
}
break;
case 2: /* tsearch(). */
if (present[key]) {
ATF_CHECK_EQ(&keys[key],
*(int **)tsearch(&key, &root, compar));
} else {
ATF_CHECK_EQ(&keys[key], *(int **)tsearch(
&keys[key], &root, compar));
present[key] = true;
n_nodes++;
}
break;
}
tnode_assert(root);
}
/* Walk the tree. */
twalk(root, treewalk);
ATF_CHECK_EQ(n_nodes, n_seen);
/* Remove all entries from the tree. */
for (int key = 0; key < NKEYS; ++key)
if (present[key])
ATF_CHECK(tdelete(&key, &root, compar) != NULL);
ATF_CHECK_EQ(NULL, root);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, tsearch_test);
return (atf_no_error());
}
|
