| /* |
| * $XConsortium: ifparser.h,v 1.1 92/08/22 13:05:39 rws Exp $ |
| * |
| * Copyright 1992 Network Computing Devices, Inc. |
| * |
| * Permission to use, copy, modify, and distribute this software and its |
| * documentation for any purpose and without fee is hereby granted, provided |
| * that the above copyright notice appear in all copies and that both that |
| * copyright notice and this permission notice appear in supporting |
| * documentation, and that the name of Network Computing Devices may not be |
| * used in advertising or publicity pertaining to distribution of the software |
| * without specific, written prior permission. Network Computing Devices makes |
| * no representations about the suitability of this software for any purpose. |
| * It is provided ``as is'' without express or implied warranty. |
| * |
| * NETWORK COMPUTING DEVICES DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS |
| * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, |
| * IN NO EVENT SHALL NETWORK COMPUTING DEVICES BE LIABLE FOR ANY SPECIAL, |
| * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM |
| * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE |
| * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| * PERFORMANCE OF THIS SOFTWARE. |
| * |
| * Author: Jim Fulton |
| * Network Computing Devices, Inc. |
| * |
| * Simple if statement processor |
| * |
| * This module can be used to evaluate string representations of C language |
| * if constructs. It accepts the following grammar: |
| * |
| * EXPRESSION := VALUE |
| * | VALUE BINOP EXPRESSION |
| * |
| * VALUE := '(' EXPRESSION ')' |
| * | '!' VALUE |
| * | '-' VALUE |
| * | 'defined' '(' variable ')' |
| * | variable |
| * | number |
| * |
| * BINOP := '*' | '/' | '%' |
| * | '+' | '-' |
| * | '<<' | '>>' |
| * | '<' | '>' | '<=' | '>=' |
| * | '==' | '!=' |
| * | '&' | '|' |
| * | '&&' | '||' |
| * |
| * The normal C order of precidence is supported. |
| * |
| * |
| * External Entry Points: |
| * |
| * ParseIfExpression parse a string for #if |
| */ |
| |
| #include <stdio.h> |
| |
| typedef int Bool; |
| #define False 0 |
| #define True 1 |
| |
| typedef struct _if_parser { |
| struct { /* functions */ |
| const char *(*handle_error) (/* struct _if_parser *, const char *, |
| const char * */); |
| int (*eval_variable) (/* struct _if_parser *, const char *, int */); |
| int (*eval_defined) (/* struct _if_parser *, const char *, int */); |
| } funcs; |
| char *data; |
| } IfParser; |
| |
| const char *ParseIfExpression (/* IfParser *, const char *, int * */); |
| |