// @file util.cpp

/*    Copyright 2009 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program 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 Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */

#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