src/time.cc

   1 /*
   2  * Copyright (C) 1996-2015 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 struct timeval current_time;
  15 double current_dtime;
  16 time_t squid_curtime = 0;
  17
  18 time_t
  19 getCurrentTime(void)
  20 {
  21 #if GETTIMEOFDAY_NO_TZP
  22     gettimeofday(&current_time);
  23 #else
  24
  25     gettimeofday(&current_time, NULL);
  26 #endif
  27
  28     current_dtime = (double) current_time.tv_sec +
  29                     (double) current_time.tv_usec / 1000000.0;
  30     return squid_curtime = current_time.tv_sec;
  31 }
  32
  33 int
  34 tvSubMsec(struct timeval t1, struct timeval t2)
  35 {
  36     return (t2.tv_sec - t1.tv_sec) * 1000 +
  37            (t2.tv_usec - t1.tv_usec) / 1000;
  38 }
  39
  40 void
  41 tvSub(struct timeval &res, struct timeval const &t1, struct timeval const &t2)
  42 {
  43     res.tv_sec = t2.tv_sec - t1.tv_sec;
  44     if (t2.tv_usec >= t1.tv_usec)
  45         res.tv_usec = t2.tv_usec - t1.tv_usec;
  46     else {
  47         res.tv_sec -= 1;
  48         res.tv_usec = t2.tv_usec + 1000000 - t1.tv_usec;
  49     }
  50 }
  51
  52 void tvAdd(struct timeval &res, struct timeval const &t1, struct timeval const &t2)
  53 {
  54     res.tv_sec = t1.tv_sec + t2.tv_sec;
  55     res.tv_usec = t1.tv_usec + t2.tv_usec;
  56     if (res.tv_usec >= 1000000) {
  57         ++res.tv_sec;
  58         res.tv_usec -= 1000000;
  59     }
  60 }
  61
  62 void tvAssignAdd(struct timeval &t, struct timeval const &add)
  63 {
  64     t.tv_sec += add.tv_sec;
  65     t.tv_usec += add.tv_usec;
  66     if (t.tv_usec >= 1000000) {
  67         ++t.tv_sec;
  68         t.tv_usec -= 1000000;
  69     }
  70 }
  71
  72 TimeEngine::~TimeEngine()
  73 {}
  74
  75 void
  76 TimeEngine::tick()
  77 {
  78     getCurrentTime();
  79 }
  80
  81 const char *
  82 Time::FormatStrf(time_t t)
  83 {
  84     struct tm *tm;
  85     static char buf[128];
  86     static time_t last_t = 0;
  87
  88     if (t != last_t) {
  89         tm = localtime(&t);
  90         strftime(buf, 127, "%Y/%m/%d %H:%M:%S", tm);
  91         last_t = t;
  92     }
  93
  94     return buf;
  95 }
  96
  97 const char *
  98 Time::FormatHttpd(time_t t)
  99 {
 100     static char buf[128];
 101     static time_t last_t = 0;
 102
 103     if (t != last_t) {
 104         struct tm *gmt = gmtime(&t);
 105
 106 #if !USE_GMT
 107         int gmt_min, gmt_hour, gmt_yday, day_offset;
 108         size_t len;
 109         struct tm *lt;
 110         int min_offset;
 111
 112         /* localtime & gmtime may use the same static data */
 113         gmt_min = gmt->tm_min;
 114         gmt_hour = gmt->tm_hour;
 115         gmt_yday = gmt->tm_yday;
 116
 117         lt = localtime(&t);
 118
 119         day_offset = lt->tm_yday - gmt_yday;
 120         /* wrap round on end of year */
 121         if (day_offset > 1)
 122             day_offset = -1;
 123         else if (day_offset < -1)
 124             day_offset = 1;
 125
 126         min_offset = day_offset * 1440 + (lt->tm_hour - gmt_hour) * 60
 127                      + (lt->tm_min - gmt_min);
 128
 129         len = strftime(buf, 127 - 5, "%d/%b/%Y:%H:%M:%S ", lt);
 130         snprintf(buf + len, 128 - len, "%+03d%02d",
 131                  (min_offset / 60) % 24,
 132                  min_offset % 60);
 133 #else /* USE_GMT */
 134         buf[0] = '\0';
 135         strftime(buf, 127, "%d/%b/%Y:%H:%M:%S -000", gmt);
 136 #endif /* USE_GMT */
 137
 138         last_t = t;
 139     }
 140
 141     return buf;
 142 }
 143