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 "lib/util/time_basic.h"
  26
  27 /**
  28 a gettimeofday wrapper
  29 **/
  30 _PUBLIC_ void GetTimeOfDay(struct timeval *tval)
  31 {
  32 #if defined(HAVE_GETTIMEOFDAY_TZ) || defined(HAVE_GETTIMEOFDAY_TZ_VOID)
  33         gettimeofday(tval,NULL);
  34 #else
  35         gettimeofday(tval);
  36 #endif
  37 }
  38
  39 /****************************************************************************
  40  Return the date and time as a string
  41 ****************************************************************************/
  42
  43 char *timeval_str_buf(const struct timeval *tp, bool rfc5424, bool hires,
  44                       struct timeval_buf *dst)
  45 {
  46         time_t t;
  47         struct tm *tm;
  48         size_t len;
  49
  50         t = (time_t)tp->tv_sec;
  51         tm = localtime(&t);
  52
  53         if (tm == NULL) {
  54                 if (hires) {
  55                         snprintf(dst->buf, sizeof(dst->buf),
  56                                  "%ld.%06ld seconds since the Epoch",
  57                                  (long)tp->tv_sec, (long)tp->tv_usec);
  58                 } else {
  59                         snprintf(dst->buf, sizeof(dst->buf),
  60                                  "%ld seconds since the Epoch", (long)t);
  61                 }
  62                 return dst->buf;
  63         }
  64
  65         len = snprintf(dst->buf, sizeof(dst->buf),
  66                        (rfc5424 ?
  67                         "%04d-%02d-%02dT%02d:%02d:%02d" :
  68                         "%04d/%02d/%02d %02d:%02d:%02d"),
  69                        1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
  70                        tm->tm_hour, tm->tm_min, tm->tm_sec);
  71
  72         if ((rfc5424 || hires) && (len < sizeof(dst->buf))) {
  73                 len += snprintf(dst->buf + len, sizeof(dst->buf) - len,
  74                                 ".%06ld", (long)tp->tv_usec);
  75         }
  76
  77         if (rfc5424 && (len < sizeof(dst->buf))) {
  78                 struct tm tm_utc, tm_local;
  79                 int offset;
  80
  81                 tm_local = *tm;
  82                 /* It is reasonable to assume that if localtime()
  83                  * worked above, then gmtime() should also work
  84                  * without error. */
  85                 tm_utc = *gmtime(&t);
  86
  87                 offset = (tm_local.tm_hour - tm_utc.tm_hour) * 60 +
  88                         (tm_local.tm_min - tm_utc.tm_min);
  89
  90                 snprintf(dst->buf + len, sizeof(dst->buf) - len,
  91                          "%c%02d:%02d",
  92                          (offset >=0 ? '+' : '-'),
  93                          abs(offset) / 60,
  94                          abs(offset) % 60);
  95         }
  96
  97         return dst->buf;
  98 }