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/* $OpenBSD: rcstime.c,v 1.6 2016/08/26 09:02:54 guenther 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 <err.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "rcs.h"
void
rcs_set_tz(char *tz, struct rcs_delta *rdp, struct tm *tb)
{
int tzone;
int pos;
char *h, *m;
const char *errstr;
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(*tb));
} 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(*tb));
tzone = strtonum(h, -23, 23, &errstr);
if (errstr)
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 = strtonum(m, 0, 59, &errstr);
if (errstr)
errx(1, "%s: not a known minute", m);
if ((tb->tm_min + tzone) >= 60) {
tb->tm_hour++;
tb->tm_min -= (60 - tzone);
} else
tb->tm_min += tzone;
tb->tm_gmtoff += (tzone*60);
}
}
}
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