/usr/include/kpathsea/variable.h is in libkpathsea-dev 2013.20130729.30972-2ubuntu0.1.
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 46 | /* variable.h: declare variable expander.
Copyright 1993, 1995, 2008 Karl Berry.
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, see <http://www.gnu.org/licenses/>. */
#ifndef KPATHSEA_VARIABLE_H
#define KPATHSEA_VARIABLE_H
#include <kpathsea/c-proto.h>
#include <kpathsea/types.h>
/* Return the (variable-expanded) environment variable value or config
file value, or NULL. */
extern KPSEDLL string kpathsea_var_value (kpathsea kpse, const_string var);
/* Expand $VAR, ${VAR}, and ~ references in SRC, returning the (always newly
dynamically-allocated) result. An unterminated ${ or any other
character following $ produce error messages, and that part of SRC is
ignored. In the $VAR form, the variable name consists of consecutive
letters, digits, and underscores. In the ${VAR} form, the variable
name consists of whatever is between the braces.
In any case, ``expansion'' means calling `getenv'; if the variable is not
set, look in texmf.cnf files for a definition. If not set there, either,
the expansion is the empty string (no error). */
extern KPSEDLL string kpathsea_var_expand (kpathsea kpse, const_string src);
#if defined (KPSE_COMPAT_API)
extern KPSEDLL string kpse_var_value (const_string var);
extern KPSEDLL string kpse_var_expand (const_string src);
#endif
#endif /* not KPATHSEA_VARIABLE_H */
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