blob: c707d35f290e6eb363ed4d9647b51bf40bf453dc (
plain)
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
|
// @file util.cpp
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mongo/pch.h"
#include <iomanip>
#include "mongo/platform/atomic_word.h"
#include "mongo/util/concurrency/mutex.h"
#include "mongo/util/goodies.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/stacktrace.h"
#include "mongo/util/startup_test.h"
#include "mongo/util/time_support.h"
#include "mongo/util/timer.h"
namespace mongo {
string hexdump(const char *data, unsigned len) {
verify( len < 1000000 );
const unsigned char *p = (const unsigned char *) data;
stringstream ss;
ss << std::hex << setw(2) << setfill('0');
for( unsigned i = 0; i < len; i++ ) {
ss << static_cast<unsigned>(p[i]) << ' ';
}
string s = ss.str();
return s;
}
bool isPrime(int n) {
int z = 2;
while ( 1 ) {
if ( z*z > n )
break;
if ( n % z == 0 )
return false;
z++;
}
return true;
}
int nextPrime(int n) {
n |= 1; // 2 goes to 3...don't care...
while ( !isPrime(n) )
n += 2;
return n;
}
struct UtilTest : public StartupTest {
void run() {
verify( isPrime(3) );
verify( isPrime(2) );
verify( isPrime(13) );
verify( isPrime(17) );
verify( !isPrime(9) );
verify( !isPrime(6) );
verify( nextPrime(4) == 5 );
verify( nextPrime(8) == 11 );
verify( endsWith("abcde", "de") );
verify( !endsWith("abcde", "dasdfasdfashkfde") );
verify( swapEndian(0x01020304) == 0x04030201 );
}
} utilTest;
ostream& operator<<( ostream &s, const ThreadSafeString &o ) {
s << o.toString();
return s;
}
bool StaticObserver::_destroyingStatics = false;
} // namespace mongo
|
