base/time.cc

   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
  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()
  51 {
  52     time = new _timeval;
  53     ::gettimeofday(&time->tv, NULL);
  54 }
  55
  56 Time::Time(const timeval &val)
  57 {
  58     time = new _timeval;
  59     set(val);
  60 }
  61
  62 Time::Time(const Time &val)
  63 {
  64     time = new _timeval;
  65     set(val.get());
  66 }
  67
  68 Time::~Time()
  69 {
  70     delete time;
  71 }
  72
  73 const timeval &
  74 Time::get() const
  75 {
  76     return time->tv;
  77 }
  78
  79 void
  80 Time::set(const timeval &tv)
  81 {
  82     memcpy(&time->tv, &tv, sizeof(timeval));
  83 }
  84
  85 void
  86 Time::reset()
  87 {
  88     ::gettimeofday(&time->tv, NULL);
  89 }
  90
  91 double
  92 Time::operator()() const
  93 {
  94     return convert(get());
  95 }
  96
  97 string
  98 Time::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
 115 ostream &
 116 operator<<(ostream &out, const Time &start)
 117 {
 118     out << start.date();
 119     return out;
 120 }
 121
 122 Time
 123 operator-(const Time &l, const Time &r)
 124 {
 125     timeval tv;
 126     timersub(&l.get(), &r.get(), &tv);
 127     return tv;
 128 }
 129
 130 const Time Time::start;