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fork our code we shared between openrcs/cvs into the openrcs dir.

this was starting to become inhuman to maintain without
ugly ugly hacks in the shared code, and it will be easier
to make specific changes for openrcs without touching the
soon-to-be-replaced opencvs code.

/*	$OpenBSD: rcstime.c,v 1.1 2006/04/26 02:55:13 joris Exp $	*/
/*
 * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
 */

#include "includes.h"

#include "rcs.h"

void
rcs_set_tz(char *tz, struct rcs_delta *rdp, struct tm *tb)
{
	int tzone;
	int pos;
	char *h, *m;
	struct tm *ltb;
	time_t now;

	if (!strcmp(tz, "LT")) {
		now = mktime(&rdp->rd_date);
		ltb = localtime(&now);
		ltb->tm_hour += ((int)ltb->tm_gmtoff/3600);
		memcpy(tb, ltb, sizeof(struct tm));
	} else {
		pos = 0;
		switch (*tz) {
		case '-':
			break;
		case '+':
			pos = 1;
			break;
		default:
			errx(1, "%s: not a known time zone", tz);
		}

		h = (tz + 1);
		if ((m = strrchr(tz, ':')) != NULL)
			*(m++) = '\0';

		memcpy(tb, &rdp->rd_date, sizeof(struct tm));

		tzone = atoi(h);
		if ((tzone >= 24) && (tzone <= -24))
			errx(1, "%s: not a known time zone", tz);

		if (pos) {
			tb->tm_hour += tzone;
			tb->tm_gmtoff += (tzone * 3600);
		} else {
			tb->tm_hour -= tzone;
			tb->tm_gmtoff -= (tzone * 3600);
		}

		if ((tb->tm_hour >= 24) || (tb->tm_hour <= -24))
			tb->tm_hour = 0;

		if (m != NULL) {
			tzone = atoi(m);
			if (tzone >= 60)
				errx(1, "%s: not a known time zone", tz);

			if ((tb->tm_min + tzone) >= 60) {
				tb->tm_hour++;
				tb->tm_min -= (60 - tzone);
			} else
				tb->tm_min += tzone;

			tb->tm_gmtoff += (tzone*60);
		}
	}
}