File Coverage

erfasrc/src/cal2jd.c

Criterion	Covered	Total	%
statement	13	13	100.0
branch	9	16	56.2
condition			n/a
subroutine			n/a
pod			n/a
total	22	29	75.8

line	stmt	bran	code
1			#include "erfa.h"
2
3	9		int eraCal2jd(int iy, int im, int id, double djm0, double djm)
4			/*
5			** - - - - - - - - - -
6			** e r a C a l 2 j d
7			** - - - - - - - - - -
8			**
9			** Gregorian Calendar to Julian Date.
10			**
11			** Given:
12			** iy,im,id int year, month, day in Gregorian calendar (Note 1)
13			**
14			** Returned:
15			** djm0 double MJD zero-point: always 2400000.5
16			** djm double Modified Julian Date for 0 hrs
17			**
18			** Returned (function value):
19			** int status:
20			** 0 = OK
21			** -1 = bad year (Note 3: JD not computed)
22			** -2 = bad month (JD not computed)
23			** -3 = bad day (JD computed)
24			**
25			** Notes:
26			**
27			** 1) The algorithm used is valid from -4800 March 1, but this
28			** implementation rejects dates before -4799 January 1.
29			**
30			** 2) The Julian Date is returned in two pieces, in the usual ERFA
31			** manner, which is designed to preserve time resolution. The
32			** Julian Date is available as a single number by adding djm0 and
33			** djm.
34			**
35			** 3) In early eras the conversion is from the "Proleptic Gregorian
36			** Calendar"; no account is taken of the date(s) of adoption of
37			** the Gregorian Calendar, nor is the AD/BC numbering convention
38			** observed.
39			**
40			** Reference:
41			**
42			** Explanatory Supplement to the Astronomical Almanac,
43			** P. Kenneth Seidelmann (ed), University Science Books (1992),
44			** Section 12.92 (p604).
45			**
46			** Copyright (C) 2013-2019, NumFOCUS Foundation.
47			** Derived, with permission, from the SOFA library. See notes at end of file.
48			*/
49			{
50			int j, ly, my;
51			long iypmy;
52
53			/* Earliest year allowed (4800BC) */
54			const int IYMIN = -4799;
55
56			/* Month lengths in days */
57			static const int mtab[]
58			= {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
59
60
61			/* Preset status. */
62			j = 0;
63
64			/* Validate year and month. */
65	9	50	if (iy < IYMIN) return -1;
66	9	50	if (im < 1 \|\| im > 12) return -2;
67
68			/* If February in a leap year, 1, otherwise 0. */
69	9	100	ly = ((im == 2) && !(iy%4) && (iy%100 \|\| !(iy%400)));
		50
		50
		50
70
71			/* Validate day, taking into account leap years. */
72	9	50	if ( (id < 1) \|\| (id > (mtab[im-1] + ly))) j = -3;
		50
73
74			/* Return result. */
75	9		my = (im - 14) / 12;
76	9		iypmy = (long) (iy + my);
77	9		*djm0 = ERFA_DJM0;
78	18		djm = (double)((1461L (iypmy + 4800L)) / 4L
79	9		+ (367L * (long) (im - 2 - 12 * my)) / 12L
80	9		- (3L * ((iypmy + 4900L) / 100L)) / 4L
81	9		+ (long) id - 2432076L);
82
83			/* Return status. */
84	9		return j;
85
86			}
87			/*----------------------------------------------------------------------
88			**
89			**
90			** Copyright (C) 2013-2019, NumFOCUS Foundation.
91			** All rights reserved.
92			**
93			** This library is derived, with permission, from the International
94			** Astronomical Union's "Standards of Fundamental Astronomy" library,
95			** available from http://www.iausofa.org.
96			**
97			** The ERFA version is intended to retain identical functionality to
98			** the SOFA library, but made distinct through different function and
99			** file names, as set out in the SOFA license conditions. The SOFA
100			** original has a role as a reference standard for the IAU and IERS,
101			** and consequently redistribution is permitted only in its unaltered
102			** state. The ERFA version is not subject to this restriction and
103			** therefore can be included in distributions which do not support the
104			** concept of "read only" software.
105			**
106			** Although the intent is to replicate the SOFA API (other than
107			** replacement of prefix names) and results (with the exception of
108			** bugs; any that are discovered will be fixed), SOFA is not
109			** responsible for any errors found in this version of the library.
110			**
111			** If you wish to acknowledge the SOFA heritage, please acknowledge
112			** that you are using a library derived from SOFA, rather than SOFA
113			** itself.
114			**
115			**
116			** TERMS AND CONDITIONS
117			**
118			** Redistribution and use in source and binary forms, with or without
119			** modification, are permitted provided that the following conditions
120			** are met:
121			**
122			** 1 Redistributions of source code must retain the above copyright
123			** notice, this list of conditions and the following disclaimer.
124			**
125			** 2 Redistributions in binary form must reproduce the above copyright
126			** notice, this list of conditions and the following disclaimer in
127			** the documentation and/or other materials provided with the
128			** distribution.
129			**
130			** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
131			** the International Astronomical Union nor the names of its
132			** contributors may be used to endorse or promote products derived
133			** from this software without specific prior written permission.
134			**
135			** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
136			** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
137			** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
138			** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
139			** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
140			** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
141			** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
142			** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
143			** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
144			** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
145			** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
146			** POSSIBILITY OF SUCH DAMAGE.
147			**
148			*/