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/*
* Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.
* All rights reserved.
* Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved.
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
*/
#include <sendmail.h>
SM_RCSID("@(#)$Id: arpadate.c,v 8.31 2006/08/15 23:24:55 ca Exp $")
/*
** ARPADATE -- Create date in ARPANET format
**
** Parameters:
** ud -- unix style date string. if NULL, one is created.
**
** Returns:
** pointer to an ARPANET date field
**
** Side Effects:
** none
**
** WARNING:
** date is stored in a local buffer -- subsequent
** calls will overwrite.
**
** Bugs:
** Timezone is computed from local time, rather than
** from wherever (and whenever) the message was sent.
** To do better is very hard.
**
** Some sites are now inserting the timezone into the
** local date. This routine should figure out what
** the format is and work appropriately.
*/
#ifndef TZNAME_MAX
# define TZNAME_MAX 50 /* max size of timezone */
#endif /* ! TZNAME_MAX */
/* values for TZ_TYPE */
#define TZ_NONE 0 /* no character timezone support */
#define TZ_TM_NAME 1 /* use tm->tm_name */
#define TZ_TM_ZONE 2 /* use tm->tm_zone */
#define TZ_TZNAME 3 /* use tzname[] */
#define TZ_TIMEZONE 4 /* use timezone() */
char *
arpadate(ud)
register char *ud;
{
register char *p;
register char *q;
register int off;
register int i;
register struct tm *lt;
time_t t;
struct tm gmt;
char *tz;
static char b[43 + TZNAME_MAX];
/*
** Get current time.
** This will be used if a null argument is passed and
** to resolve the timezone.
*/
/* SM_REQUIRE(ud == NULL || strlen(ud) >= 23); */
t = curtime();
if (ud == NULL)
ud = ctime(&t);
/*
** Crack the UNIX date line in a singularly unoriginal way.
*/
q = b;
p = &ud[0]; /* Mon */
*q++ = *p++;
*q++ = *p++;
*q++ = *p++;
*q++ = ',';
*q++ = ' ';
p = &ud[8]; /* 16 */
if (*p == ' ')
p++;
else
*q++ = *p++;
*q++ = *p++;
*q++ = ' ';
p = &ud[4]; /* Sep */
*q++ = *p++;
*q++ = *p++;
*q++ = *p++;
*q++ = ' ';
p = &ud[20]; /* 1979 */
*q++ = *p++;
*q++ = *p++;
*q++ = *p++;
*q++ = *p++;
*q++ = ' ';
p = &ud[11]; /* 01:03:52 */
for (i = 8; i > 0; i--)
*q++ = *p++;
/*
** should really get the timezone from the time in "ud" (which
** is only different if a non-null arg was passed which is different
** from the current time), but for all practical purposes, returning
** the current local zone will do (its all that is ever needed).
*/
gmt = *gmtime(&t);
lt = localtime(&t);
off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
/* assume that offset isn't more than a day ... */
if (lt->tm_year < gmt.tm_year)
off -= 24 * 60;
else if (lt->tm_year > gmt.tm_year)
off += 24 * 60;
else if (lt->tm_yday < gmt.tm_yday)
off -= 24 * 60;
else if (lt->tm_yday > gmt.tm_yday)
off += 24 * 60;
*q++ = ' ';
if (off == 0)
{
*q++ = 'G';
*q++ = 'M';
*q++ = 'T';
}
else
{
tz = NULL;
#if TZ_TYPE == TZ_TM_NAME
tz = lt->tm_name;
#endif /* TZ_TYPE == TZ_TM_NAME */
#if TZ_TYPE == TZ_TM_ZONE
tz = lt->tm_zone;
#endif /* TZ_TYPE == TZ_TM_ZONE */
#if TZ_TYPE == TZ_TZNAME
{
extern char *tzname[];
if (lt->tm_isdst > 0)
tz = tzname[1];
else if (lt->tm_isdst == 0)
tz = tzname[0];
else
tz = NULL;
}
#endif /* TZ_TYPE == TZ_TZNAME */
#if TZ_TYPE == TZ_TIMEZONE
{
extern char *timezone();
tz = timezone(off, lt->tm_isdst);
}
#endif /* TZ_TYPE == TZ_TIMEZONE */
if (off < 0)
{
off = -off;
*q++ = '-';
}
else
*q++ = '+';
if (off >= 24*60) /* should be impossible */
off = 23*60+59; /* if not, insert silly value */
*q++ = (off / 600) + '0';
*q++ = (off / 60) % 10 + '0';
off %= 60;
*q++ = (off / 10) + '0';
*q++ = (off % 10) + '0';
if (tz != NULL && *tz != '\0')
{
*q++ = ' ';
*q++ = '(';
while (*tz != '\0' && q < &b[sizeof(b) - 3])
*q++ = *tz++;
*q++ = ')';
}
}
*q = '\0';
return b;
}
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