[unix-history] / usr.sbin / sendmail / src / arpadate.c

/*
 * Copyright (c) 1983 Eric P. Allman
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)arpadate.c	8.1 (Berkeley) 6/7/93";
#endif /* not lint */

# include "sendmail.h"

/*
**  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 whereever (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.
*/

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;
	static char b[40];

	/*
	**  Get current time.
	**	This will be used if a null argument is passed and
	**	to resolve the timezone.
	*/

	(void) time(&t);
	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 {
		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';
	}
	*q = '\0';

	return (b);
}
Commit	Line	Data
15637ed4 RG	1	/*
15637ed4 RG	2	* Copyright (c) 1983 Eric P. Allman
6f14531a RG	3	* Copyright (c) 1988, 1993
6f14531a RG	4	* The Regents of the University of California. All rights reserved.
15637ed4 RG	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* 3. All advertising materials mentioning features or use of this software
	15	* must display the following acknowledgement:
	16	* This product includes software developed by the University of
	17	* California, Berkeley and its contributors.
	18	* 4. Neither the name of the University nor the names of its contributors
	19	* may be used to endorse or promote products derived from this software
	20	* without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	23	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	27	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	28	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	29	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	30	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	31	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	* SUCH DAMAGE.
	33	*/
	34
	35	#ifndef lint
6f14531a	36	static char sccsid[] = "@(#)arpadate.c 8.1 (Berkeley) 6/7/93";
15637ed4 RG	37	#endif /* not lint */
15637ed4 RG	38
6f14531a	39	# include "sendmail.h"
15637ed4 RG	40
	41	/*
	42	** ARPADATE -- Create date in ARPANET format
	43	**
	44	** Parameters:
	45	** ud -- unix style date string. if NULL, one is created.
	46	**
	47	** Returns:
	48	** pointer to an ARPANET date field
	49	**
	50	** Side Effects:
	51	** none
	52	**
	53	** WARNING:
	54	** date is stored in a local buffer -- subsequent
	55	** calls will overwrite.
	56	**
	57	** Bugs:
	58	** Timezone is computed from local time, rather than
	59	** from whereever (and whenever) the message was sent.
	60	** To do better is very hard.
	61	**
	62	** Some sites are now inserting the timezone into the
	63	** local date. This routine should figure out what
	64	** the format is and work appropriately.
	65	*/
	66
	67	char *
	68	arpadate(ud)
	69	register char *ud;
	70	{
	71	register char *p;
	72	register char *q;
	73	register int off;
	74	register int i;
	75	register struct tm *lt;
	76	time_t t;
	77	struct tm gmt;
	78	static char b[40];
15637ed4 RG	79
	80	/*
	81	** Get current time.
	82	** This will be used if a null argument is passed and
	83	** to resolve the timezone.
	84	*/
	85
	86	(void) time(&t);
	87	if (ud == NULL)
	88	ud = ctime(&t);
	89
	90	/*
	91	** Crack the UNIX date line in a singularly unoriginal way.
	92	*/
	93
	94	q = b;
	95
	96	p = &ud[0]; /* Mon */
	97	q++ = p++;
	98	q++ = p++;
	99	q++ = p++;
	100	*q++ = ',';
	101	*q++ = ' ';
	102
	103	p = &ud[8]; /* 16 */
	104	if (*p == ' ')
	105	p++;
	106	else
	107	q++ = p++;
	108	q++ = p++;
	109	*q++ = ' ';
	110
	111	p = &ud[4]; /* Sep */
	112	q++ = p++;
	113	q++ = p++;
	114	q++ = p++;
	115	*q++ = ' ';
	116
6f14531a RG	117	p = &ud[20]; /* 1979 */
	118	q++ = p++;
	119	q++ = p++;
15637ed4 RG	120	q++ = p++;
	121	q++ = p++;
	122	*q++ = ' ';
	123
	124	p = &ud[11]; /* 01:03:52 */
	125	for (i = 8; i > 0; i--)
	126	q++ = p++;
	127
	128	/*
	129	* should really get the timezone from the time in "ud" (which
	130	* is only different if a non-null arg was passed which is different
	131	* from the current time), but for all practical purposes, returning
	132	* the current local zone will do (its all that is ever needed).
	133	*/
	134	gmt = *gmtime(&t);
	135	lt = localtime(&t);
	136
	137	off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
	138
	139	/* assume that offset isn't more than a day ... */
	140	if (lt->tm_year < gmt.tm_year)
	141	off -= 24 * 60;
	142	else if (lt->tm_year > gmt.tm_year)
	143	off += 24 * 60;
	144	else if (lt->tm_yday < gmt.tm_yday)
	145	off -= 24 * 60;
	146	else if (lt->tm_yday > gmt.tm_yday)
	147	off += 24 * 60;
	148
	149	*q++ = ' ';
	150	if (off == 0) {
	151	*q++ = 'G';
	152	*q++ = 'M';
	153	*q++ = 'T';
	154	} else {
	155	if (off < 0) {
	156	off = -off;
	157	*q++ = '-';
	158	} else
	159	*q++ = '+';
	160
	161	if (off >= 2460) / should be impossible */
	162	off = 2360+59; / if not, insert silly value */
	163
	164	*q++ = (off / 600) + '0';
	165	*q++ = (off / 60) % 10 + '0';
	166	off %= 60;
	167	*q++ = (off / 10) + '0';
	168	*q++ = (off % 10) + '0';
	169	}
	170	*q = '\0';
	171
	172	return (b);
	173	}