/*
 * Copyright (c) 2002-2004, 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/utilities/sid/syntax.c,v 1.6 2004/03/16 03:44:18 bp Exp $
 */


/**** syntax.c --- Character classification.
 *
 ** Author: Steve Folkes <smf@hermes.mod.uk>
 *
 **** Commentary:
 *
 * This file implements the syntax table facility specified in the file
 * "syntax.h". See that file for more details.
 *
 * This particular implementation assumes that the ASCII character set is
 * being used. It will need changing for other character sets.
 */

#include "syntax.h"

/*--------------------------------------------------------------------------*/

int
syntax_value(char c)
{
	if ((c >= '0') && (c <= '9')) {
		return (c - '0');
	} else if ((c >= 'A') && (c <= 'Z')) {
		return (c - 'A' + 10);
	} else if ((c >= 'a') && (c <= 'z')) {
		return (c - 'a' + 10);
	}
	return (SYNTAX_NO_VALUE);
}

char
syntax_upcase(char c)
{
	if ((c >= 'a') && (c <= 'z')) {
		return ((char) (c - 'a' + 'A'));
	}
	return (c);
}

char
syntax_downcase(char c)
{
	if ((c >= 'A') && (c <= 'Z')) {
		return ((char) (c - 'A' + 'a'));
	}
	return (c);
}

BoolT
syntax_is_white_space(char c)
{
	return ((c < 33) || (c > 126));
}

BoolT
syntax_is_printable(char c)
{
	return ((c > 31) && (c < 127));
}

BoolT
syntax_is_letter(char c)
{
	return (((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')));
}

BoolT
syntax_is_digit(char c)
{
	return ((c >= '0') && (c <= '9'));
}
