base/time.cc

   1 /*
   2  * Copyright (c) 2003-2005 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
  37 using namespace std;
  38
  39 struct _timeval
  40 {
  41     timeval tv;
  42 };
  43
  44 double
  45 convert(const timeval &tv)
  46 {
  47     return (double)tv.tv_sec + (double)tv.tv_usec / 1000000.0;
  48 }
  49
  50 Time::Time(bool set_now)
  51 {
  52     time = new _timeval;
  53     if (set_now)
  54         set();
  55 }
  56
  57 Time::Time(const timeval &val)
  58 {
  59     time = new _timeval;
  60     set(val);
  61 }
  62
  63 Time::Time(const Time &val)
  64 {
  65     time = new _timeval;
  66     set(val.get());
  67 }
  68
  69 Time::~Time()
  70 {
  71     delete time;
  72 }
  73
  74 const timeval &
  75 Time::get() const
  76 {
  77     return time->tv;
  78 }
  79
  80 void
  81 Time::set()
  82 {
  83     ::gettimeofday(&time->tv, NULL);
  84 }
  85
  86 void
  87 Time::set(const timeval &tv)
  88 {
  89     memcpy(&time->tv, &tv, sizeof(timeval));
  90 }
  91
  92 double
  93 Time::operator()() const
  94 {
  95     return convert(get());
  96 }
  97
  98 string
  99 Time::date(string format) const
 100 {
 101     const timeval &tv = get();
 102     time_t sec = tv.tv_sec;
 103     char buf[256];
 104
 105     if (format.empty()) {
 106         ctime_r(&sec, buf);
 107         buf[24] = '\0';
 108         return buf;
 109     }
 110
 111     struct tm *tm = localtime(&sec);
 112     strftime(buf, sizeof(buf), format.c_str(), tm);
 113     return buf;
 114 }
 115
 116 ostream &
 117 operator<<(ostream &out, const Time &start)
 118 {
 119     out << start.date();
 120     return out;
 121 }
 122
 123 Time
 124 operator-(const Time &l, const Time &r)
 125 {
 126     timeval tv;
 127     timersub(&l.get(), &r.get(), &tv);
 128     return tv;
 129 }
 130
 131 const Time Time::start(true);