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
|
/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdio.h>
#include <stdlib.h>
struct entry
{
int val;
const char *str;
} arr[] =
{
{ 0, "zero" },
{ 1, "one" },
{ 2, "two" },
{ 3, "three" },
{ 4, "four" },
{ 5, "five" },
{ 6, "six" },
{ 7, "seven" },
{ 8, "eight" },
{ 9, "nine" },
{ 10, "ten" }
};
#define narr (sizeof (arr) / sizeof (arr[0]))
static int
comp (const void *p1, const void *p2)
{
struct entry *e1 = (struct entry *) p1;
struct entry *e2 = (struct entry *) p2;
return e1->val - e2->val;
}
int
main (void)
{
size_t cnt;
int result = 0;
struct entry key;
struct entry *res;
for (cnt = 0; cnt < narr; ++cnt)
{
key.val = arr[cnt].val;
res = (struct entry *) bsearch (&key, arr, narr, sizeof (arr[0]), comp);
if (res == NULL)
{
printf ("entry %zd not found\n", cnt);
result = 1;
}
else if (res != &arr[cnt])
{
puts ("wrong entry returned");
result = 1;
}
}
/* And some special tests that shouldn't find any entry. */
key.val = -1;
res = (struct entry *) bsearch (&key, arr, narr, sizeof (arr[0]), comp);
if (res != NULL)
{
puts ("found an entry that's not there");
result = 1;
}
key.val = 11;
res = (struct entry *) bsearch (&key, arr, narr, sizeof (arr[0]), comp);
if (res != NULL)
{
puts ("found an entry that's not there");
result = 1;
}
key.val = 11;
res = (struct entry *) bsearch (&key, arr, 0, sizeof (arr[0]), comp);
if (res != NULL)
{
puts ("found an entry that's not there");
result = 1;
}
/* Now the array contains only one element - no entry should be found. */
for (cnt = 0; cnt < narr; ++cnt)
{
key.val = arr[cnt].val;
res = (struct entry *) bsearch (&key, &arr[5], 1, sizeof (arr[0]), comp);
if (cnt == 5)
{
if (res == NULL)
{
printf ("entry %zd not found\n", cnt);
result = 1;
}
else if (res != &arr[cnt])
{
puts ("wrong entry returned");
result = 1;
}
}
else if (res != NULL)
{
puts ("found an entry that's not there");
result = 1;
}
}
if (result == 0)
puts ("all OK");
return result;
}
|
