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time.c
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/* time.c - UTCTime and GeneralizedTime helper
* Copyright (C) 2001 g10 Code GmbH
*
* This file is part of KSBA.
*
* KSBA is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* KSBA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include "util.h"
#include "convert.h"
#define digitp(p) (*(p) >= 0 && *(p) <= '9')
/* the atoi macros assume that the buffer has only valid digits */
#define atoi_1(p) (*(p) - '0' )
#define atoi_2(p) ((atoi_1(p) * 10) + atoi_1((p)+1))
#define atoi_4(p) ((atoi_2(p) * 100) + atoi_2((p)+2))
/* Converts an UTCTime or GeneralizedTime to epoc. Returns (time_t)-1
on error. The function figures automagically the right format.
fixme: Currently we only zupport Zulu time and no timezone */
time_t
_ksba_asntime_to_epoch (const char *buffer, size_t length)
{
const char *s;
size_t n;
struct tm buf;
int year;
for (s=buffer, n=0; n < length && digitp (s); n++, s++)
;
if ((n != 12 && n != 14) || *s != 'Z')
return (time_t)(-1);
s = buffer;
if (n==12)
{
year = atoi_2 (s);
s += 2;
year += year < 50? 2000:1900;
}
else
{
year = atoi_4 (s);
s += 4;
}
if (year < 1900)
return (time_t)(-1);
buf.tm_year = year - 1900;
buf.tm_mon = atoi_2 (s) - 1;
s += 2;
buf.tm_mday = atoi_2 (s);
s += 2;
buf.tm_hour = atoi_2 (s);
s += 2;
buf.tm_min = atoi_2 (s);
s += 2;
buf.tm_sec = atoi_2 (s);
s += 2;
buf.tm_isdst = 0;
#warning We should reset TZ if we cannot use timegm()
#ifdef HAVE_TIMEGM
return timegm (&buf);
#else
{
time_t tim;
putenv ("TZ=UTC");
tim = mktime (&buf);
return tim;
}
#endif
}
/* convert an epoch time T into Generalized Time and return that in
rbuf and rlength. Caller must free the returned buffer */
int
_ksba_asntime_from_epoch (time_t t, char **rbuf, size_t *rlength)
{
*rbuf = NULL;
*rlength = 0;
return -1; /* error */
}

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