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a7efdabefc
The 'struct tm' is now properly updated to reflect the time and date information which comes out of the number of seconds calculated. A bug reported by Andreas Falkenhahn is resolved which had the effect of distorting the number of seconds calculated.
156 lines
4.2 KiB
C
Executable File
156 lines
4.2 KiB
C
Executable File
/*
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* $Id: time_mktime.c,v 1.11 2015-06-26 11:22:00 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDLIB_NULL_POINTER_CHECK_H
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#include "stdlib_null_pointer_check.h"
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#endif /* _STDLIB_NULL_POINTER_CHECK_H */
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/****************************************************************************/
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#ifndef _TIME_HEADERS_H
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#include "time_headers.h"
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#endif /* _TIME_HEADERS_H */
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#ifndef _LOCALE_HEADERS_H
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#include "locale_headers.h"
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#endif /* _LOCALE_HEADERS_H */
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/****************************************************************************/
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time_t
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mktime(struct tm *tm)
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{
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DECLARE_UTILITYBASE();
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struct ClockData clock_data;
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ULONG seconds;
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time_t result = (time_t)-1;
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LONG combined_seconds;
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int month, year;
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ENTER();
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assert( tm != NULL );
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assert( UtilityBase != NULL );
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#if defined(CHECK_FOR_NULL_POINTERS)
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{
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if(tm == NULL)
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{
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SHOWMSG("invalid tm parameter");
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__set_errno(EFAULT);
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goto out;
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}
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}
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#endif /* CHECK_FOR_NULL_POINTERS */
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/* Normalize the year and month. */
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year = tm->tm_year + 1900;
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month = tm->tm_mon + 1;
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if(month < 0 || month > 12)
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{
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int y;
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y = month / 12;
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month -= y * 12;
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year += y;
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}
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if(month < 1)
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{
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month += 12;
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year -= 1;
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}
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/* The year must be valid. Amiga time begins with January 1st, 1978. */
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if(year < 1978)
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{
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SHOWVALUE(year);
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SHOWMSG("invalid year");
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goto out;
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}
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/* Convert the first day of the month in the given year
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into the corresponding number of seconds. */
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memset(&clock_data, 0, sizeof(clock_data));
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clock_data.mday = 1;
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clock_data.month = month;
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clock_data.year = year;
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seconds = Date2Amiga(&clock_data);
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/* Put the combined number of seconds involved together,
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covering the seconds/minutes/hours of the day as well
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as the number of days of the month. This will be added
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to the number of seconds for the date. */
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combined_seconds = tm->tm_sec + 60 * (tm->tm_min + 60 * (tm->tm_hour + 24 * (tm->tm_mday-1)));
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/* If the combined number of seconds is negative, adding it
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* to the number of seconds for the date should not produce
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* a negative value.
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*/
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if(combined_seconds < 0 && seconds < (ULONG)(-combined_seconds))
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{
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SHOWVALUE(seconds);
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SHOWVALUE(combined_seconds);
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SHOWMSG("invalid combined number of seconds");
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goto out;
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}
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seconds += combined_seconds;
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__locale_lock();
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/* The data in 'struct tm *tm' was given in local time. We need
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to convert the result into UTC. */
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if(__default_locale != NULL)
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seconds += 60 * __default_locale->loc_GMTOffset;
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__locale_unlock();
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/* Adjust for the difference between the Unix and the
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AmigaOS epochs, which differ by 8 years. */
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result = seconds + UNIX_TIME_OFFSET;
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/* Finally, normalize the provided time and date information. */
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localtime_r(&result, tm);
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out:
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RETURN(result);
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return(result);
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}
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