lib/util/time_basic.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * time handling functions
   4  *
   5  * Copyright (C) Andrew Tridgell                1992-2004
   6  * Copyright (C) Stefan (metze) Metzmacher      2002
   7  * Copyright (C) Jeremy Allison                 2007
   8  * Copyright (C) Andrew Bartlett                2011
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "replace.h"
  25 #include "system/time.h"
  26 #include "lib/util/time_basic.h"
  27
  28 /**
  29 a gettimeofday wrapper
  30 **/
  31 _PUBLIC_ void GetTimeOfDay(struct timeval *tval)
  32 {
  33 #if defined(HAVE_GETTIMEOFDAY_TZ) || defined(HAVE_GETTIMEOFDAY_TZ_VOID)
  34         gettimeofday(tval,NULL);
  35 #else
  36         gettimeofday(tval);
  37 #endif
  38 }
  39
  40 /****************************************************************************
  41  Return the date and time as a string
  42 ****************************************************************************/
  43
  44 char *timeval_str_buf(const struct timeval *tp, bool rfc5424, bool hires,
  45                       struct timeval_buf *dst)
  46 {
  47         time_t t;
  48         struct tm *tm;
  49         size_t len;
  50
  51         t = (time_t)tp->tv_sec;
  52         tm = localtime(&t);
  53
  54         if (tm == NULL) {
  55                 if (hires) {
  56                         snprintf(dst->buf, sizeof(dst->buf),
  57                                  "%ld.%06ld seconds since the Epoch",
  58                                  (long)tp->tv_sec, (long)tp->tv_usec);
  59                 } else {
  60                         snprintf(dst->buf, sizeof(dst->buf),
  61                                  "%ld seconds since the Epoch", (long)t);
  62                 }
  63                 return dst->buf;
  64         }
  65
  66         len = snprintf(dst->buf, sizeof(dst->buf),
  67                        (rfc5424 ?
  68                         "%04d-%02d-%02dT%02d:%02d:%02d" :
  69                         "%04d/%02d/%02d %02d:%02d:%02d"),
  70                        1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
  71                        tm->tm_hour, tm->tm_min, tm->tm_sec);
  72
  73         if ((rfc5424 || hires) && (len < sizeof(dst->buf))) {
  74                 len += snprintf(dst->buf + len, sizeof(dst->buf) - len,
  75                                 ".%06ld", (long)tp->tv_usec);
  76         }
  77
  78         if (rfc5424 && (len < sizeof(dst->buf))) {
  79                 struct tm tm_utc, tm_local;
  80                 int offset;
  81
  82                 tm_local = *tm;
  83                 /* It is reasonable to assume that if localtime()
  84                  * worked above, then gmtime() should also work
  85                  * without error. */
  86                 tm_utc = *gmtime(&t);
  87
  88                 offset = (tm_local.tm_hour - tm_utc.tm_hour) * 60 +
  89                         (tm_local.tm_min - tm_utc.tm_min);
  90
  91                 snprintf(dst->buf + len, sizeof(dst->buf) - len,
  92                          "%c%02d:%02d",
  93                          (offset >=0 ? '+' : '-'),
  94                          abs(offset) / 60,
  95                          abs(offset) % 60);
  96         }
  97
  98         return dst->buf;
  99 }