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Diffstat (limited to 'ast/erfa/d2tf.c')
| -rw-r--r-- | ast/erfa/d2tf.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/ast/erfa/d2tf.c b/ast/erfa/d2tf.c deleted file mode 100644 index 3608f7f..0000000 --- a/ast/erfa/d2tf.c +++ /dev/null @@ -1,169 +0,0 @@ -#include "erfa.h" - -void eraD2tf(int ndp, double days, char *sign, int ihmsf[4]) -/* -** - - - - - - - - -** e r a D 2 t f -** - - - - - - - - -** -** Decompose days to hours, minutes, seconds, fraction. -** -** Given: -** ndp int resolution (Note 1) -** days double interval in days -** -** Returned: -** sign char '+' or '-' -** ihmsf int[4] hours, minutes, seconds, fraction -** -** Notes: -** -** 1) The argument ndp is interpreted as follows: -** -** ndp resolution -** : ...0000 00 00 -** -7 1000 00 00 -** -6 100 00 00 -** -5 10 00 00 -** -4 1 00 00 -** -3 0 10 00 -** -2 0 01 00 -** -1 0 00 10 -** 0 0 00 01 -** 1 0 00 00.1 -** 2 0 00 00.01 -** 3 0 00 00.001 -** : 0 00 00.000... -** -** 2) The largest positive useful value for ndp is determined by the -** size of days, the format of double on the target platform, and -** the risk of overflowing ihmsf[3]. On a typical platform, for -** days up to 1.0, the available floating-point precision might -** correspond to ndp=12. However, the practical limit is typically -** ndp=9, set by the capacity of a 32-bit int, or ndp=4 if int is -** only 16 bits. -** -** 3) The absolute value of days may exceed 1.0. In cases where it -** does not, it is up to the caller to test for and handle the -** case where days is very nearly 1.0 and rounds up to 24 hours, -** by testing for ihmsf[0]=24 and setting ihmsf[0-3] to zero. -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - int nrs, n; - double rs, rm, rh, a, w, ah, am, as, af; - - -/* Handle sign. */ - *sign = (char) ( ( days >= 0.0 ) ? '+' : '-' ); - -/* Interval in seconds. */ - a = ERFA_DAYSEC * fabs(days); - -/* Pre-round if resolution coarser than 1s (then pretend ndp=1). */ - if (ndp < 0) { - nrs = 1; - for (n = 1; n <= -ndp; n++) { - nrs *= (n == 2 || n == 4) ? 6 : 10; - } - rs = (double) nrs; - w = a / rs; - a = rs * ERFA_DNINT(w); - } - -/* Express the unit of each field in resolution units. */ - nrs = 1; - for (n = 1; n <= ndp; n++) { - nrs *= 10; - } - rs = (double) nrs; - rm = rs * 60.0; - rh = rm * 60.0; - -/* Round the interval and express in resolution units. */ - a = ERFA_DNINT(rs * a); - -/* Break into fields. */ - ah = a / rh; - ah = ERFA_DINT(ah); - a -= ah * rh; - am = a / rm; - am = ERFA_DINT(am); - a -= am * rm; - as = a / rs; - as = ERFA_DINT(as); - af = a - as * rs; - -/* Return results. */ - ihmsf[0] = (int) ah; - ihmsf[1] = (int) am; - ihmsf[2] = (int) as; - ihmsf[3] = (int) af; - - return; - -} -/*---------------------------------------------------------------------- -** -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** All rights reserved. -** -** This library is derived, with permission, from the International -** Astronomical Union's "Standards of Fundamental Astronomy" library, -** available from http://www.iausofa.org. -** -** The ERFA version is intended to retain identical functionality to -** the SOFA library, but made distinct through different function and -** file names, as set out in the SOFA license conditions. The SOFA -** original has a role as a reference standard for the IAU and IERS, -** and consequently redistribution is permitted only in its unaltered -** state. The ERFA version is not subject to this restriction and -** therefore can be included in distributions which do not support the -** concept of "read only" software. -** -** Although the intent is to replicate the SOFA API (other than -** replacement of prefix names) and results (with the exception of -** bugs; any that are discovered will be fixed), SOFA is not -** responsible for any errors found in this version of the library. -** -** If you wish to acknowledge the SOFA heritage, please acknowledge -** that you are using a library derived from SOFA, rather than SOFA -** itself. -** -** -** TERMS AND CONDITIONS -** -** 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 Standards Of Fundamental Astronomy Board, -** the International Astronomical Union 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 THE -** COPYRIGHT HOLDER 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. -** -*/ |