time.cc revision 400 
1/*
2 * Copyright (c) 2003 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/types.h>
30#include <sys/time.h>
31#include <time.h>
32#include <iostream>
33#include <string>
34
35#include "base/time.hh"
36
37using namespace std;
38
39struct _timeval
40{
41    timeval tv;
42};
43
44double
45convert(const timeval &tv)
46{
47    return (double)tv.tv_sec + (double)tv.tv_usec / 1000000.0;
48}
49
50Time::Time()
51{
52    time = new _timeval;
53    ::gettimeofday(&time->tv, NULL);
54}
55
56Time::Time(const timeval &val)
57{
58    time = new _timeval;
59    set(val);
60}
61
62Time::Time(const Time &val)
63{
64    time = new _timeval;
65    set(val.get());
66}
67
68Time::~Time()
69{
70    delete time;
71}
72
73const timeval &
74Time::get() const
75{
76    return time->tv;
77}
78
79void
80Time::set(const timeval &tv)
81{
82    memcpy(&time->tv, &tv, sizeof(timeval));
83}
84
85void
86Time::reset()
87{
88    ::gettimeofday(&time->tv, NULL);
89}
90
91double
92Time::operator()() const
93{
94    return convert(get());
95}
96
97string
98Time::date(string format) const
99{
100    const timeval &tv = get();
101    time_t sec = tv.tv_sec;
102    char buf[256];
103
104    if (format.empty()) {
105        ctime_r(&sec, buf);
106        buf[24] = '\0';
107        return buf;
108    }
109
110    struct tm *tm = localtime(&sec);
111    strftime(buf, sizeof(buf), format.c_str(), tm);
112    return buf;
113}
114
115ostream &
116operator<<(ostream &out, const Time &start)
117{
118    out << start.date();
119    return out;
120}
121
122Time
123operator-(const Time &l, const Time &r)
124{
125    timeval tv;
126    timersub(&l.get(), &r.get(), &tv);
127    return tv;
128}
129
130const Time Time::start;
131