File Coverage

erfasrc/src/a2tf.c

Criterion	Covered	Total	%
statement	3	3	100.0
branch			n/a
condition			n/a
subroutine			n/a
pod			n/a
total	3	3	100.0

line	stmt	code
1		#include "erfa.h"
2
3	29	void eraA2tf(int ndp, double angle, char *sign, int ihmsf[4])
4		/*
5		** - - - - - - - -
6		** e r a A 2 t f
7		** - - - - - - - -
8		**
9		** Decompose radians into hours, minutes, seconds, fraction.
10		**
11		** Given:
12		** ndp int resolution (Note 1)
13		** angle double angle in radians
14		**
15		** Returned:
16		** sign char '+' or '-'
17		** ihmsf int[4] hours, minutes, seconds, fraction
18		**
19		** Called:
20		** eraD2tf decompose days to hms
21		**
22		** Notes:
23		**
24		** 1) The argument ndp is interpreted as follows:
25		**
26		** ndp resolution
27		** : ...0000 00 00
28		** -7 1000 00 00
29		** -6 100 00 00
30		** -5 10 00 00
31		** -4 1 00 00
32		** -3 0 10 00
33		** -2 0 01 00
34		** -1 0 00 10
35		** 0 0 00 01
36		** 1 0 00 00.1
37		** 2 0 00 00.01
38		** 3 0 00 00.001
39		** : 0 00 00.000...
40		**
41		** 2) The largest positive useful value for ndp is determined by the
42		** size of angle, the format of doubles on the target platform, and
43		** the risk of overflowing ihmsf[3]. On a typical platform, for
44		** angle up to 2pi, the available floating-point precision might
45		** correspond to ndp=12. However, the practical limit is typically
46		** ndp=9, set by the capacity of a 32-bit int, or ndp=4 if int is
47		** only 16 bits.
48		**
49		** 3) The absolute value of angle may exceed 2pi. In cases where it
50		** does not, it is up to the caller to test for and handle the
51		** case where angle is very nearly 2pi and rounds up to 24 hours,
52		** by testing for ihmsf[0]=24 and setting ihmsf[0-3] to zero.
53		**
54		** Copyright (C) 2013-2019, NumFOCUS Foundation.
55		** Derived, with permission, from the SOFA library. See notes at end of file.
56		*/
57		{
58		/* Scale then use days to h,m,s function. */
59	29	eraD2tf(ndp, angle/ERFA_D2PI, sign, ihmsf);
60
61	29	return;
62
63		}
64		/*----------------------------------------------------------------------
65		**
66		**
67		** Copyright (C) 2013-2019, NumFOCUS Foundation.
68		** All rights reserved.
69		**
70		** This library is derived, with permission, from the International
71		** Astronomical Union's "Standards of Fundamental Astronomy" library,
72		** available from http://www.iausofa.org.
73		**
74		** The ERFA version is intended to retain identical functionality to
75		** the SOFA library, but made distinct through different function and
76		** file names, as set out in the SOFA license conditions. The SOFA
77		** original has a role as a reference standard for the IAU and IERS,
78		** and consequently redistribution is permitted only in its unaltered
79		** state. The ERFA version is not subject to this restriction and
80		** therefore can be included in distributions which do not support the
81		** concept of "read only" software.
82		**
83		** Although the intent is to replicate the SOFA API (other than
84		** replacement of prefix names) and results (with the exception of
85		** bugs; any that are discovered will be fixed), SOFA is not
86		** responsible for any errors found in this version of the library.
87		**
88		** If you wish to acknowledge the SOFA heritage, please acknowledge
89		** that you are using a library derived from SOFA, rather than SOFA
90		** itself.
91		**
92		**
93		** TERMS AND CONDITIONS
94		**
95		** Redistribution and use in source and binary forms, with or without
96		** modification, are permitted provided that the following conditions
97		** are met:
98		**
99		** 1 Redistributions of source code must retain the above copyright
100		** notice, this list of conditions and the following disclaimer.
101		**
102		** 2 Redistributions in binary form must reproduce the above copyright
103		** notice, this list of conditions and the following disclaimer in
104		** the documentation and/or other materials provided with the
105		** distribution.
106		**
107		** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
108		** the International Astronomical Union nor the names of its
109		** contributors may be used to endorse or promote products derived
110		** from this software without specific prior written permission.
111		**
112		** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
113		** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
114		** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
115		** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
116		** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
117		** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
118		** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
119		** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
120		** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
121		** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
122		** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
123		** POSSIBILITY OF SUCH DAMAGE.
124		**
125		*/