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/*
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expr.h - limited shell-like expression parsing functions
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This file is part of the nss-pam-ldapd library.
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Copyright (C) 2009, 2012 Arthur de Jong
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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#ifndef COMMON__EXPR_H
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#define COMMON__EXPR_H 1
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#include "compat/attrs.h"
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#include "common/set.h"
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typedef const char *(*expr_expander_func) (const char *name, void *expander_arg);
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/* Parse the expression and store the result in buffer, using the
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expander function to expand variable names to values. If the expression
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is invalid or the result didn't fit in the buffer NULL is returned. */
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MUST_USE const char *expr_parse(const char *expr, char *buffer, size_t buflen,
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expr_expander_func expander, void *expander_arg);
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/* Return the variable names that are used in expr. If set is NULL a new one
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is allocated, otherwise the passed set is added to. */
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SET *expr_vars(const char *expr, SET *set);
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#endif /* not _COMMON__ */
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