1/*
2 *
3 * Copyright 1992 Network Computing Devices, Inc.
4 *
5 * Permission to use, copy, modify, and distribute this software and its
6 * documentation for any purpose and without fee is hereby granted, provided
7 * that the above copyright notice appear in all copies and that both that
8 * copyright notice and this permission notice appear in supporting
9 * documentation, and that the name of Network Computing Devices may not be
10 * used in advertising or publicity pertaining to distribution of the software
11 * without specific, written prior permission.  Network Computing Devices makes
12 * no representations about the suitability of this software for any purpose.
13 * It is provided ``as is'' without express or implied warranty.
14 *
15 * NETWORK COMPUTING DEVICES DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
16 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
17 * IN NO EVENT SHALL NETWORK COMPUTING DEVICES BE LIABLE FOR ANY SPECIAL,
18 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
19 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
20 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
21 * PERFORMANCE OF THIS SOFTWARE.
22 *
23 * Author:  Jim Fulton
24 *          Network Computing Devices, Inc.
25 *
26 * Simple if statement processor
27 *
28 * This module can be used to evaluate string representations of C language
29 * if constructs.  It accepts the following grammar:
30 *
31 *     EXPRESSION	:=	VALUE
32 * 			 |	VALUE  BINOP	EXPRESSION
33 *			 |	VALUE	'?'	EXPRESSION ':'	EXPRESSION
34 *
35 *     VALUE		:=	'('  EXPRESSION  ')'
36 * 			 |	'!'  VALUE
37 * 			 |	'-'  VALUE
38 *			 |	'~'  VALUE
39 * 			 |	'defined'  '('  variable  ')'
40 * 			 |	variable
41 * 			 |	number
42 *
43 *     BINOP		:=	'*'	|  '/'	|  '%'
44 * 			 |	'+'	|  '-'
45 * 			 |	'<<'	|  '>>'
46 * 			 |	'<'	|  '>'	|  '<='  |  '>='
47 * 			 |	'=='	|  '!='
48 * 			 |	'&'	|  '^'  |  '|'
49 * 			 |	'&&'	|  '||'
50 *
51 * The normal C order of precedence is supported.
52 *
53 *
54 * External Entry Points:
55 *
56 *     ParseIfExpression		parse a string for #if
57 */
58
59#include <stdio.h>
60
61typedef int Bool;
62
63#define False 0
64#define True 1
65
66typedef struct _if_parser {
67    struct {                    /* functions */
68        const char *(*handle_error)(struct _if_parser *, const char *,
69                                    const char *);
70        long (*eval_variable)(struct _if_parser *, const char *, int);
71        int (*eval_defined)(struct _if_parser *, const char *, int);
72    } funcs;
73    struct _parse_data *data;
74} IfParser;
75
76const char *ParseIfExpression(IfParser *, const char *, long *);
77