src/time.cc

   1 /*
   2  * Copyright (C) 1996-2021 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /* DEBUG: section 21    Time Functions */
  10
  11 #include "squid.h"
  12 #include "SquidTime.h"
  13
  14 #include <iomanip>
  15 #include <ostream>
  16
  17 struct timeval current_time;
  18 double current_dtime;
  19 time_t squid_curtime = 0;
  20
  21 time_t
  22 getCurrentTime(void)
  23 {
  24 #if GETTIMEOFDAY_NO_TZP
  25     gettimeofday(&current_time);
  26 #else
  27
  28     gettimeofday(&current_time, NULL);
  29 #endif
  30
  31     current_dtime = (double) current_time.tv_sec +
  32                     (double) current_time.tv_usec / 1000000.0;
  33     return squid_curtime = current_time.tv_sec;
  34 }
  35
  36 int
  37 tvSubMsec(struct timeval t1, struct timeval t2)
  38 {
  39     return (t2.tv_sec - t1.tv_sec) * 1000 +
  40            (t2.tv_usec - t1.tv_usec) / 1000;
  41 }
  42
  43 void
  44 tvSub(struct timeval &res, struct timeval const &t1, struct timeval const &t2)
  45 {
  46     res.tv_sec = t2.tv_sec - t1.tv_sec;
  47     if (t2.tv_usec >= t1.tv_usec)
  48         res.tv_usec = t2.tv_usec - t1.tv_usec;
  49     else {
  50         res.tv_sec -= 1;
  51         res.tv_usec = t2.tv_usec + 1000000 - t1.tv_usec;
  52     }
  53 }
  54
  55 void tvAdd(struct timeval &res, struct timeval const &t1, struct timeval const &t2)
  56 {
  57     res.tv_sec = t1.tv_sec + t2.tv_sec;
  58     res.tv_usec = t1.tv_usec + t2.tv_usec;
  59     if (res.tv_usec >= 1000000) {
  60         ++res.tv_sec;
  61         res.tv_usec -= 1000000;
  62     }
  63 }
  64
  65 void tvAssignAdd(struct timeval &t, struct timeval const &add)
  66 {
  67     t.tv_sec += add.tv_sec;
  68     t.tv_usec += add.tv_usec;
  69     if (t.tv_usec >= 1000000) {
  70         ++t.tv_sec;
  71         t.tv_usec -= 1000000;
  72     }
  73 }
  74
  75 TimeEngine::~TimeEngine()
  76 {}
  77
  78 void
  79 TimeEngine::tick()
  80 {
  81     getCurrentTime();
  82 }
  83
  84 std::ostream &
  85 operator <<(std::ostream &os, const timeval &t)
  86 {
  87     os << t.tv_sec << ".";
  88     const auto savedFill = os.fill('0');
  89     os << std::setw(6) << t.tv_usec;
  90     os.fill(savedFill);
  91     return os;
  92 }
  93
  94 const char *
  95 Time::FormatStrf(time_t t)
  96 {
  97     struct tm *tm;
  98     static char buf[128];
  99     static time_t last_t = 0;
 100
 101     if (t != last_t) {
 102         tm = localtime(&t);
 103         strftime(buf, 127, "%Y/%m/%d %H:%M:%S", tm);
 104         last_t = t;
 105     }
 106
 107     return buf;
 108 }
 109
 110 const char *
 111 Time::FormatHttpd(time_t t)
 112 {
 113     static char buf[128];
 114     static time_t last_t = 0;
 115
 116     if (t != last_t) {
 117         struct tm *gmt = gmtime(&t);
 118
 119 #if !USE_GMT
 120         int gmt_min, gmt_hour, gmt_yday, day_offset;
 121         size_t len;
 122         struct tm *lt;
 123         int min_offset;
 124
 125         /* localtime & gmtime may use the same static data */
 126         gmt_min = gmt->tm_min;
 127         gmt_hour = gmt->tm_hour;
 128         gmt_yday = gmt->tm_yday;
 129
 130         lt = localtime(&t);
 131
 132         day_offset = lt->tm_yday - gmt_yday;
 133         /* wrap round on end of year */
 134         if (day_offset > 1)
 135             day_offset = -1;
 136         else if (day_offset < -1)
 137             day_offset = 1;
 138
 139         min_offset = day_offset * 1440 + (lt->tm_hour - gmt_hour) * 60
 140                      + (lt->tm_min - gmt_min);
 141
 142         len = strftime(buf, 127 - 5, "%d/%b/%Y:%H:%M:%S ", lt);
 143         snprintf(buf + len, 128 - len, "%+03d%02d",
 144                  (min_offset / 60) % 24,
 145                  min_offset % 60);
 146 #else /* USE_GMT */
 147         buf[0] = '\0';
 148         strftime(buf, 127, "%d/%b/%Y:%H:%M:%S -000", gmt);
 149 #endif /* USE_GMT */
 150
 151         last_t = t;
 152     }
 153
 154     return buf;
 155 }
 156