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/*
* This file is part of libESMTP, a library for submission of RFC 2822
* formatted electronic mail messages using the SMTP protocol described
* in RFC 2821.
*
* Copyright (C) 2001,2002 Brian Stafford <brian@stafford.uklinux.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#include <missing.h> /* declarations for missing library functions */
#if TM_IN_SYS_TIME
# include <sys/time.h>
# if TIME_WITH_SYS_TIME
# include <time.h>
# endif
#else
# include <time.h>
#endif
#include "rfc2822date.h"
#if !HAVE_STRUCT_TM_TM_ZONE
/* Calculate seconds since 1970 from the struct tm. Leap seconds are
ignored, tm must be normalised and the time zone is ignored.
If called with a struct tm filled in by localtime() the result
will be wrong by the number of seconds the current timezone is
offset from GMT! */
#define EPOCH 1970
static time_t
libesmtp_mktime (struct tm *tm)
{
time_t when;
int day, year;
static const int days[] =
{
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334,
};
year = tm->tm_year + 1900;
day = days[tm->tm_mon] + tm->tm_mday - 1;
/* adjust for leap years */
day += (year - (EPOCH - (EPOCH % 4))) / 4;
day -= (year - (EPOCH - (EPOCH % 100))) / 100;
day += (year - (EPOCH - (EPOCH % 400))) / 400;
when = ((year - EPOCH) * 365 + day) * 24 + tm->tm_hour;
when = (when * 60 + tm->tm_min) * 60 + tm->tm_sec;
return when;
}
#endif
static const char *days[] =
{ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", };
static const char *months[] =
{ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec", };
char *
rfc2822date (char buf[], size_t buflen, time_t *timedate)
{
struct tm *tm;
#if HAVE_LOCALTIME_R
struct tm tmbuf;
#endif
int dir, minutes;
#if !HAVE_STRUCT_TM_TM_ZONE
time_t gmtoff;
#endif
#if HAVE_LOCALTIME_R
tm = localtime_r (timedate, &tmbuf);
#else
tm = localtime (timedate);
#endif
#if HAVE_STRUCT_TM_TM_ZONE
minutes = tm->tm_gmtoff / 60;
#else
gmtoff = libesmtp_mktime (tm);
gmtoff -= *timedate;
minutes = gmtoff / 60;
#endif
dir = (minutes > 0) ? '+' : '-';
if (minutes < 0)
minutes = -minutes;
snprintf (buf, buflen, "%s, %d %s %d %02d:%02d:%02d %c%02d%02d",
days[tm->tm_wday],
tm->tm_mday, months[tm->tm_mon], tm->tm_year + 1900,
tm->tm_hour, tm->tm_min, tm->tm_sec,
dir, minutes / 60, minutes % 60);
return buf;
}
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