This file is indexed.

/usr/include/gsl/gsl_nan.h is in libgsl-dev 2.4+dfsg-6.

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
/* gsl_nan.h
 * 
 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Gerard Jungman, Brian Gough
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or (at
 * your option) any later version.
 * 
 * This program 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#ifndef __GSL_NAN_H__
#define __GSL_NAN_H__

#ifdef INFINITY
# define GSL_POSINF INFINITY
# define GSL_NEGINF (-INFINITY)
#elif defined(HUGE_VAL)
# define GSL_POSINF HUGE_VAL
# define GSL_NEGINF (-HUGE_VAL)
#else
# define GSL_POSINF (gsl_posinf())
# define GSL_NEGINF (gsl_neginf())
#endif

#ifdef NAN
# define GSL_NAN NAN
#elif defined(INFINITY)
# define GSL_NAN (INFINITY/INFINITY)
#else
# define GSL_NAN (gsl_nan())
#endif

#define GSL_POSZERO (+0.0)
#define GSL_NEGZERO (-0.0)

#endif /* __GSL_NAN_H__ */