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Import of the watch repository from Pebble

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Matthieu Jeanson 2024-12-12 16:43:03 -08:00 • committed by Katharine Berry
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29
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Copyright (C) 2001-2003 by egnite Software GmbH. 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. Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH 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 EGNITE
SOFTWARE GMBH 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.
For additional information see http://www.ethernut.de/

194
third_party/mktime/mktime.c vendored Normal file
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/*
* Copyright (C) 2001-2003 by egnite Software GmbH. 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. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH 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 EGNITE
* SOFTWARE GMBH 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.
*
* For additional information see http://www.ethernut.de/
*/
#include <stdint.h>
#include "util/time/time.h"
#include <stddef.h>
/*
* ChkAdd evaluates to TRUE if dest = src1 + src2 has overflowed
*/
#define ChkAdd(dest, src1, src2) ( ((src1 >= 0L) && (src2 >= 0L) \
&& (dest < 0L)) || ((src1 < 0L) && (src2 < 0L) && (dest >= 0L)) )
/*
* ChkMul evaluates to TRUE if dest = src1 * src2 has overflowed
*/
#define ChkMul(dest, src1, src2) ( src1 ? (dest/src1 != src2) : 0 )
#define _BASE_YEAR 70L
#define _LEAP_YEAR_ADJUST 17L // leap years between 1900 and 1970
#define _MAX_YEAR 138L
time_t mktime(struct tm *tb) {
const int16_t _days[] = {-1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364};
time_t tmptm1, tmptm2, tmptm3;
struct tm *tbtemp;
/*
* First, make sure tm_year is reasonably close to being in range.
*/
if (((tmptm1 = tb->tm_year) < _BASE_YEAR - 1) || (tmptm1 > _MAX_YEAR + 1))
goto err_mktime;
/*
* Adjust month value so it is in the range 0 - 11. This is because
* we don't know how many days are in months 12, 13, 14, etc.
*/
if ((tb->tm_mon < 0) || (tb->tm_mon > 11)) {
/*
* no danger of overflow because the range check above.
*/
tmptm1 += (tb->tm_mon / 12);
if ((tb->tm_mon %= 12) < 0) {
tb->tm_mon += 12;
tmptm1--;
}
/*
* Make sure year count is still in range.
*/
if ((tmptm1 < _BASE_YEAR - 1) || (tmptm1 > _MAX_YEAR + 1))
goto err_mktime;
}
/***** HERE: tmptm1 holds number of elapsed years *****/
/*
* Calculate days elapsed minus one, in the given year, to the given
* month. Check for leap year and adjust if necessary.
*/
tmptm2 = _days[tb->tm_mon];
if (!(tmptm1 & 3) && (tb->tm_mon > 1))
tmptm2++;
/*
* Calculate elapsed days since base date (midnight, 1/1/70, UTC)
*
*
* 365 days for each elapsed year since 1970, plus one more day for
* each elapsed leap year. no danger of overflow because of the range
* check (above) on tmptm1.
*/
tmptm3 = (tmptm1 - _BASE_YEAR) * 365L + ((tmptm1 - 1L) >> 2)
- _LEAP_YEAR_ADJUST;
/*
* elapsed days to current month (still no possible overflow)
*/
tmptm3 += tmptm2;
/*
* elapsed days to current date. overflow is now possible.
*/
tmptm1 = tmptm3 + (tmptm2 = (int32_t) (tb->tm_mday));
if (ChkAdd(tmptm1, tmptm3, tmptm2))
goto err_mktime;
/***** HERE: tmptm1 holds number of elapsed days *****/
/*
* Calculate elapsed hours since base date
*/
tmptm2 = tmptm1 * 24L;
if (ChkMul(tmptm2, tmptm1, 24L))
goto err_mktime;
tmptm1 = tmptm2 + (tmptm3 = (int32_t) tb->tm_hour);
if (ChkAdd(tmptm1, tmptm2, tmptm3))
goto err_mktime;
/***** HERE: tmptm1 holds number of elapsed hours *****/
/*
* Calculate elapsed minutes since base date
*/
tmptm2 = tmptm1 * 60L;
if (ChkMul(tmptm2, tmptm1, 60L))
goto err_mktime;
tmptm1 = tmptm2 + (tmptm3 = (int32_t) tb->tm_min);
if (ChkAdd(tmptm1, tmptm2, tmptm3))
goto err_mktime;
/***** HERE: tmptm1 holds number of elapsed minutes *****/
/*
* Calculate elapsed seconds since base date
*/
tmptm2 = tmptm1 * 60L;
if (ChkMul(tmptm2, tmptm1, 60L))
goto err_mktime;
tmptm1 = tmptm2 + (tmptm3 = (int32_t) tb->tm_sec);
if (ChkAdd(tmptm1, tmptm2, tmptm3))
goto err_mktime;
/***** HERE: tmptm1 holds number of elapsed seconds *****/
/*
* Adjust for timezone. No need to check for overflow since
* localtime() will check its arg value
*/
tmptm1 -= tb->tm_gmtoff;
tmptm1 -= tb->tm_isdst * 60 * 60;
/*
* Convert this second count back into a time block structure.
* If localtime returns NULL, return an error.
*/
struct tm tm;
if ((tbtemp = gmtime_r((time_t*)&tmptm1, &tm)) == NULL)
goto err_mktime;
/***** HERE: tmptm1 holds number of elapsed seconds, adjusted *****/
/***** for local time if requested *****/
*tb = *tbtemp;
return (time_t) tmptm1;
err_mktime:
/*
* All errors come to here
*/
return (time_t) (-1);
}