ifparser.h

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/*
 * $XConsortium: ifparser.h /main/4 1996/09/28 16:15:24 rws $
 *
 * 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 ':' EXPRESSION
 *
 *     VALUE  := '('  EXPRESSION  ')'
 *        | '!'  VALUE
 *        | '-'  VALUE
 *        | '~'  VALUE
 *        | 'defined'  '('  variable  ')'
 *        | variable
 *        | number
 *
 *     BINOP  := '*' |  '/' |  '%'
 *        | '+' |  '-'
 *        | '<<' |  '>>'
 *        | '<' |  '>' |  '<='  |  '>='
 *        | '==' |  '!='
 *        | '&' |  '^'  |  '|'
 *        | '&&' |  '||'
 *
 * The normal C order of precedence is supported.
 *
 *
 * External Entry Points:
 *
 *     ParseIfExpression  parse a string for #if
 */
 
/* $XFree86: xc/config/makedepend/ifparser.h,v 3.2 1996/12/30 13:57:56 dawes Exp $ */
 
#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 *);
      long (*eval_variable)(struct _if_parser *, const char *, int);
      int (*eval_defined)(struct _if_parser *, const char *, int);
   } funcs;
   char *data;
} IfParser;
 
const char *ParseIfExpression(
#ifdef __STDC__
   IfParser *,
   const char *,
   long *
#endif
);