/usr/share/sdcc/lib/src/atan2f.c is in sdcc-libraries 2.9.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | /* atan2f.c: Computes atan2(x) where x is a 32-bit float.
Copyright (C) 2001, 2002 Jesus Calvino-Fraga, jesusc@ieee.org
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Version 1.0 - Initial release */
#include <math.h>
#include <errno.h>
float atan2f(const float x, const float y)
{
float r;
if ((x==0.0) && (y==0.0))
{
errno=EDOM;
return 0.0;
}
if(fabsf(y)>=fabsf(x))
{
r=atanf(x/y);
if(y<0.0) r+=(x>=0?PI:-PI);
}
else
{
r=-atanf(y/x);
r+=(x<0.0?-HALF_PI:HALF_PI);
}
return r;
}
|