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4e1ef62a36
Relnotes: yes
237 lines
5.5 KiB
C
237 lines
5.5 KiB
C
/*
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* prettydate - convert a time stamp to something readable
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*/
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#include <config.h>
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#include <stdio.h>
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#include "ntp_fp.h"
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#include "ntp_unixtime.h" /* includes <sys/time.h> */
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#include "lib_strbuf.h"
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#include "ntp_stdlib.h"
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#include "ntp_assert.h"
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#include "ntp_calendar.h"
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#if SIZEOF_TIME_T < 4
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# error sizeof(time_t) < 4 -- this will not work!
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#endif
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static char *common_prettydate(l_fp *, int);
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const char * const months[12] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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const char * const daynames[7] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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/* Helper function to handle possible wraparound of the ntp epoch.
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*
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* Works by periodic extension of the ntp time stamp in the UN*X epoch.
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* If the 'time_t' is 32 bit, use solar cycle warping to get the value
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* in a suitable range. Also uses solar cycle warping to work around
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* really buggy implementations of 'gmtime()' / 'localtime()' that
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* cannot work with a negative time value, that is, times before
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* 1970-01-01. (MSVCRT...)
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*
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* Apart from that we're assuming that the localtime/gmtime library
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* functions have been updated so that they work...
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*
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* An explanation: The julian calendar repeats ever 28 years, because
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* it's the LCM of 7 and 1461, the week and leap year cycles. This is
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* called a 'solar cycle'. The gregorian calendar does the same as
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* long as no centennial year (divisible by 100, but not 400) goes in
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* the way. So between 1901 and 2099 (inclusive) we can warp time
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* stamps by 28 years to make them suitable for localtime() and
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* gmtime() if we have trouble. Of course this will play hubbubb with
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* the DST zone switches, so we should do it only if necessary; but as
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* we NEED a proper conversion to dates via gmtime() we should try to
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* cope with as many idiosyncrasies as possible.
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*
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*/
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/*
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* solar cycle in unsigned secs and years, and the cycle limits.
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*/
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#define SOLAR_CYCLE_SECS 0x34AADC80UL /* 7*1461*86400*/
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#define SOLAR_CYCLE_YEARS 28
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#define MINFOLD -3
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#define MAXFOLD 3
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static struct tm *
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get_struct_tm(
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const vint64 *stamp,
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int local)
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{
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struct tm *tm = NULL;
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int32 folds = 0;
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time_t ts;
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#ifdef HAVE_INT64
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int64 tl;
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ts = tl = stamp->q_s;
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/*
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* If there is chance of truncation, try to fix it. Let the
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* compiler find out if this can happen at all.
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*/
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while (ts != tl) { /* truncation? */
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if (tl < 0) {
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if (--folds < MINFOLD)
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return NULL;
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tl += SOLAR_CYCLE_SECS;
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} else {
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if (++folds > MAXFOLD)
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return NULL;
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tl -= SOLAR_CYCLE_SECS;
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}
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ts = tl; /* next try... */
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}
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#else
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/*
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* since we do not have 64-bit scalars, it's not likely we have
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* 64-bit time_t. Assume 32 bits and properly reduce the value.
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*/
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u_int32 hi, lo;
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hi = stamp->D_s.hi;
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lo = stamp->D_s.lo;
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while ((hi && ~hi) || ((hi ^ lo) & 0x80000000u)) {
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if (M_ISNEG(hi, lo)) {
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if (--folds < MINFOLD)
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return NULL;
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M_ADD(hi, lo, 0, SOLAR_CYCLE_SECS);
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} else {
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if (++folds > MAXFOLD)
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return NULL;
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M_SUB(hi, lo, 0, SOLAR_CYCLE_SECS);
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}
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}
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ts = (int32)lo;
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#endif
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/*
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* 'ts' should be a suitable value by now. Just go ahead, but
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* with care:
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*
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* There are some pathological implementations of 'gmtime()'
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* and 'localtime()' out there. No matter if we have 32-bit or
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* 64-bit 'time_t', try to fix this by solar cycle warping
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* again...
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*
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* At least the MSDN says that the (Microsoft) Windoze
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* versions of 'gmtime()' and 'localtime()' will bark on time
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* stamps < 0.
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*/
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while ((tm = (*(local ? localtime : gmtime))(&ts)) == NULL)
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if (ts < 0) {
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if (--folds < MINFOLD)
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return NULL;
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ts += SOLAR_CYCLE_SECS;
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} else if (ts >= (time_t)SOLAR_CYCLE_SECS) {
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if (++folds > MAXFOLD)
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return NULL;
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ts -= SOLAR_CYCLE_SECS;
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} else
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return NULL; /* That's truly pathological! */
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/* 'tm' surely not NULL here! */
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INSIST(tm != NULL);
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if (folds != 0) {
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tm->tm_year += folds * SOLAR_CYCLE_YEARS;
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if (tm->tm_year <= 0 || tm->tm_year >= 200)
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return NULL; /* left warp range... can't help here! */
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}
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return tm;
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}
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static char *
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common_prettydate(
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l_fp *ts,
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int local
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)
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{
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static const char pfmt0[] =
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"%08lx.%08lx %s, %s %2d %4d %2d:%02d:%02d.%03u";
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static const char pfmt1[] =
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"%08lx.%08lx [%s, %s %2d %4d %2d:%02d:%02d.%03u UTC]";
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char *bp;
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struct tm *tm;
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u_int msec;
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u_int32 ntps;
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vint64 sec;
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LIB_GETBUF(bp);
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if (ts->l_ui == 0 && ts->l_uf == 0) {
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strlcpy (bp, "(no time)", LIB_BUFLENGTH);
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return (bp);
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}
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/* get & fix milliseconds */
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ntps = ts->l_ui;
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msec = ts->l_uf / 4294967; /* fract / (2 ** 32 / 1000) */
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if (msec >= 1000u) {
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msec -= 1000u;
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ntps++;
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}
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sec = ntpcal_ntp_to_time(ntps, NULL);
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tm = get_struct_tm(&sec, local);
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if (!tm) {
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/*
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* get a replacement, but always in UTC, using
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* ntpcal_time_to_date()
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*/
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struct calendar jd;
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ntpcal_time_to_date(&jd, &sec);
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snprintf(bp, LIB_BUFLENGTH, local ? pfmt1 : pfmt0,
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(u_long)ts->l_ui, (u_long)ts->l_uf,
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daynames[jd.weekday], months[jd.month-1],
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jd.monthday, jd.year, jd.hour,
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jd.minute, jd.second, msec);
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} else
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snprintf(bp, LIB_BUFLENGTH, pfmt0,
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(u_long)ts->l_ui, (u_long)ts->l_uf,
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daynames[tm->tm_wday], months[tm->tm_mon],
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tm->tm_mday, 1900 + tm->tm_year, tm->tm_hour,
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tm->tm_min, tm->tm_sec, msec);
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return bp;
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}
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char *
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prettydate(
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l_fp *ts
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)
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{
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return common_prettydate(ts, 1);
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}
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char *
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gmprettydate(
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l_fp *ts
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)
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{
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return common_prettydate(ts, 0);
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}
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struct tm *
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ntp2unix_tm(
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u_int32 ntp, int local
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)
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{
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vint64 vl;
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vl = ntpcal_ntp_to_time(ntp, NULL);
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return get_struct_tm(&vl, local);
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}
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