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util.c
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util.c
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/*
* Copyright (c) 2013, Koos Vriezen <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 <COPYRIGHT HOLDER> 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 "util.h"
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <math.h>
void alarm_array_init(struct AlarmArray *array)
{
array->size = array->capacity = 0;
}
void alarm_array_append(struct AlarmArray *array, void *v)
{
if (array->size == array->capacity) {
if (!array->size)
array->data = (void**)malloc(++array->capacity * sizeof (void*));
else
array->data = (void**)realloc(array->data, ++array->capacity * sizeof (void*));
}
array->data[array->size++] = v;
}
void alarm_array_remove(struct AlarmArray *array, int i)
{
if ( i < --array->size )
memmove(array->data + i, array->data + i + 1, (array->size - i) * sizeof (void*));
}
void alarm_array_clear(struct AlarmArray *array)
{
if (array->capacity)
free(array->data);
array->size = array->capacity = 0;
}
/* based on http://williams.best.vwh.net/sunrise_sunset_algorithm.htm */
/* TODO make this configurable */
#define longitude (0.00000)
#define latitude (0.0000)
double norm(double high, double d) {
while (d < 0)
d += high;
while (d > high)
d -= high;
return d;
}
static void rise_set(const struct tm* lt, int rise, int *hour, int *minute) {
const double zenith = 90 + 50./60;
double N, N1, N2, N3, lngHour, t, M, L, RA, Lquadrant, RAquadrant, sinDec, cosDec, cosH, H, T, UT;
N1 = floor(275 * (lt->tm_mon +1) / 9);
N2 = floor(((lt->tm_mon +1) + 9) / 12);
N3 = (1 + floor(((lt->tm_year+1900) - 4 * floor((lt->tm_year+1900) / 4) + 2) / 3));
N = N1 - (N2 * N3) + lt->tm_mday - 30;
lngHour = longitude / 15;
if (rise)
t = N + ((6 - lngHour) / 24); /*rising*/
else
t = N + ((18 - lngHour) / 24); /*setting*/
M = (0.9856 * t) - 3.289;
L = norm(360, M + (1.916 * sin(M*M_PI/180)) + (0.020 * sin(2 * M*M_PI/180)) + 282.634);
RA = norm(360, atan(0.91764 * tan(L*M_PI/180))*180/M_PI);
Lquadrant = floor( L/90) * 90;
RAquadrant = floor(RA/90) * 90;
RA = RA + (Lquadrant - RAquadrant);
RA = RA / 15;
sinDec = 0.39782 * sin(L*M_PI/180);
cosDec = cos(asin(sinDec));
cosH = (cos(zenith*M_PI/180) - (sinDec * sin(latitude*M_PI/180))) / (cosDec * cos(latitude*M_PI/180));
if (cosH > 1)
return;
if (cosH < -1)
return;
if (rise)
H = 360 - acos(cosH)*180/M_PI; /*rising*/
else
H = acos(cosH)*180/M_PI; /*setting*/
H = H / 15;
T = H + RA - (0.06571 * t) - 6.622;
UT = norm(24, T - lngHour);
*hour = lt->tm_gmtoff/3600 + (int)UT;
*minute = (int)((UT-(int)UT)*60);
}
void sunrise_sunset(const struct tm* lt, int *sethour, int *setminute, int *risehour, int *riseminute) {
rise_set(lt, 1, risehour, riseminute);
rise_set(lt, 0, sethour, setminute);
}