168 lines
3.4 KiB
C
168 lines
3.4 KiB
C
/*****************************************************************************
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*
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* $Id: gmtoffset.c,v 1.9 2005/10/11 20:49:42 mbse Exp $
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* Purpose ...............: Calculate UTC offset
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* Source ................: Eugene G. Crosser's ifmail package.
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*
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*****************************************************************************
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* Copyright (C) 1997-2005
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include "mbselib.h"
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/*
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* Returns the offset from your location to UTC. So in the MET timezone
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* this returns -60 (wintertime). People in the USA get positive results.
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*/
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int gmt_offset(time_t now)
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{
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struct tm ptm;
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struct tm gtm;
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int offset;
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if (!now)
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now = time(NULL);
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ptm = *localtime(&now);
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/*
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* To get the timezone, compare localtime with GMT.
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*/
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gtm = *gmtime(&now);
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/*
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* Assume we are never more than 24 hours away.
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*/
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offset = gtm.tm_yday - ptm.tm_yday;
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if (offset > 1)
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offset = -24;
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else if (offset < -1)
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offset = 24;
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else
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offset *= 24;
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/*
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* Scale in the hours and minutes; ignore seconds.
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*/
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offset += gtm.tm_hour - ptm.tm_hour;
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offset *= 60;
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offset += gtm.tm_min - ptm.tm_min;
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return offset;
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}
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/*
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* Returns the TZUTC string, note that the sign is opposite from the
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* function above.
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*/
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char *gmtoffset(time_t now)
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{
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static char buf[6]="+0000";
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char sign;
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int hr, min;
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int offset;
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offset = gmt_offset(now);
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if (offset <= 0) {
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sign = '+';
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offset = -offset;
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} else
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sign = '-';
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hr = offset / 60L;
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min = offset % 60L;
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if (sign == '-')
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snprintf(buf, 6, "%c%02d%02d", sign, hr, min);
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else
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snprintf(buf, 6, "%02d%02d", hr, min);
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return(buf);
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}
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char *str_time(time_t total)
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{
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static char buf[10];
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int h, m;
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memset(&buf, 0, sizeof(buf));
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/*
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* 0 .. 59 seconds
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*/
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if (total < (time_t)60) {
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snprintf(buf, 10, "%2d.00s", (int)total);
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return buf;
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}
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/*
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* 1:00 .. 59:59 minutes:seconds
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*/
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if (total < (time_t)3600) {
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h = total / 60;
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m = total % 60;
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snprintf(buf, 10, "%2d:%02d ", h, m);
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return buf;
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}
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/*
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* 1:00 .. 23:59 hours:minutes
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*/
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if (total < (time_t)86400) {
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h = (total / 60) / 60;
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m = (total / 60) % 60;
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snprintf(buf, 10, "%2d:%02dm", h, m);
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return buf;
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}
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/*
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* 1/00 .. 30/23 days/hours
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*/
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if (total < (time_t)2592000) {
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h = (total / 3600) / 24;
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m = (total / 3600) % 24;
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snprintf(buf, 10, "%2d/%02dh", h, m);
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return buf;
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}
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snprintf(buf, 10, "N/A ");
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return buf;
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}
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char *t_elapsed(time_t start, time_t end)
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{
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return str_time(end - start);
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}
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