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/* $OpenBSD: varname.h,v 1.3 2007/09/17 09:28:36 espie Exp $ */
#ifndef VARNAME_H
#define VARNAME_H
/*
* Copyright (c) 2001 Marc Espie.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
* PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* varname -
* Handles variable names in recursive situations, e.g.,
* to expand ${A${BC}}.
*/
/* Used to store temporary names, e.g., after $ expansion. */
struct Name {
const char *s; /* Start of name. */
const char *e; /* End of name. */
bool tofree; /* Needs freeing after use ? */
};
/* endpos = VarName_Get(startpos, &name, ctxt, undef_is_bad, cont_function);
* Gets a variable name from startpos, storing the result into name.
* Recursive names are expanded from context ctxt. Boolean
* undef_is_bad governs whether undefined variables should trigger a
* parse error. To parse its argument efficiently, VarName_Get
* uses cont_function(pos), which should return the position of the
* next $ in string, or the position where the variable spec ends (as
* differing modules have different requirements wrt variable spec
* endings). Returns the position where the variable spec finally
* ends. Name result might be a copy, or not. */
extern const char *VarName_Get(const char *, struct Name *, SymTable *,
bool, const char *(*)(const char *));
/* VarName_Free(name);
* Frees a variable name filled by VarName_Get(). */
extern void VarName_Free(struct Name *);
#endif
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