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+/* variable.h: declare variable expander.
+
+ Copyright 1993, 1995, 2008, 2019 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>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* 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 of a $FOO construct is its literal text ("$FOO"), while
+ the expansion of a ${BAR} construct is the empty string. This is so
+ at least some file names containing $ characters will work. */
+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
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* not KPATHSEA_VARIABLE_H */