/*
 * Copyright (c) 2002, The Tendra Project <http://www.ten15.org/>
 * All rights reserved.
 *
 * 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 unmodified, 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 AUTHOR ``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 AUTHOR 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.
 *
 *
 *    		 Crown Copyright (c) 1997
 *
 *    This TenDRA(r) Computer Program is subject to Copyright
 *    owned by the United Kingdom Secretary of State for Defence
 *    acting through the Defence Evaluation and Research Agency
 *    (DERA).  It is made available to Recipients with a
 *    royalty-free licence for its use, reproduction, transfer
 *    to other parties and amendment for any purpose not excluding
 *    product development provided that any such use et cetera
 *    shall be deemed to be acceptance of the following conditions:-
 *
 *        (1) Its Recipients shall ensure that this Notice is
 *        reproduced upon any copies or amended versions of it;
 *
 *        (2) Any amended version of it shall be clearly marked to
 *        show both the nature of and the organisation responsible
 *        for the relevant amendment or amendments;
 *
 *        (3) Its onward transfer from a recipient to another
 *        party shall be deemed to be that party's acceptance of
 *        these conditions;
 *
 *        (4) DERA gives no warranty or assurance as to its
 *        quality or suitability for any purpose and DERA accepts
 *        no liability whatsoever in relation to any use to which
 *        it may be put.
 *
 * $TenDRA: tendra/src/tools/tcc/environ.h,v 1.15 2005/10/22 20:54:21 stefanf Exp $
 */


#ifndef ENVIRON_INCLUDED
#define ENVIRON_INCLUDED

#include "utility.h"

/*
 *    PROCEDURE DECLARATIONS
 *
 *    These routines are concerned with reading tcc environments.
 */

extern void read_env(char *);
extern void find_envpath(void);
extern void show_envpath(char *);
extern void reconcile_envopts(void);
extern char* dereference_var (char *, char *, hashtable *, char *, int);

#define	ACTION_APPEND	'>'
#define	ACTION_PREPEND	'<'
#define	ACTION_QUERY	'?'
#define	ACTION_REPLACE	'+'

#define TCC_TBLSZE 119
#define TCC_KEYSZE  27

extern hashtable *environ_hashtable;  /* global set of env keys/values */
extern int environ_count;             /* how may -Y env loads are attempted */

/*
 *  CHARACTER TYPES
 *
 *  These macros identify various character types.
 */

#define is_alphanum(X)	(((X) >= 'A' && (X) <= 'Z') ||\
				  ((X) >= '0' && (X) <= '9') ||\
				  ((X) == '_'))
#define is_whitespace(X)	((X) == ' ' || (X) == '\t')
#define is_quote(X)		((X) == '"')
#define is_newline(X)		((X) == '\n')

#endif