config/mkdepend/ifparser.h

   1 /*
   2  * $Xorg: ifparser.h,v 1.3 2000/08/17 19:41:51 cpqbld Exp $
   3  *
   4  * Copyright 1992 Network Computing Devices, Inc.
   5  *
   6  * Permission to use, copy, modify, and distribute this software and its
   7  * documentation for any purpose and without fee is hereby granted, provided
   8  * that the above copyright notice appear in all copies and that both that
   9  * copyright notice and this permission notice appear in supporting
  10  * documentation, and that the name of Network Computing Devices may not be
  11  * used in advertising or publicity pertaining to distribution of the software
  12  * without specific, written prior permission.  Network Computing Devices makes
  13  * no representations about the suitability of this software for any purpose.
  14  * It is provided ``as is'' without express or implied warranty.
  15  *
  16  * NETWORK COMPUTING DEVICES DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  17  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
  18  * IN NO EVENT SHALL NETWORK COMPUTING DEVICES BE LIABLE FOR ANY SPECIAL,
  19  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  20  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  21  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  22  * PERFORMANCE OF THIS SOFTWARE.
  23  *
  24  * Author:  Jim Fulton
  25  *          Network Computing Devices, Inc.
  26  *
  27  * Simple if statement processor
  28  *
  29  * This module can be used to evaluate string representations of C language
  30  * if constructs.  It accepts the following grammar:
  31  *
  32  *     EXPRESSION       :=      VALUE
  33  *                       |      VALUE  BINOP    EXPRESSION
  34  *                       |      VALUE   '?'     EXPRESSION ':'  EXPRESSION
  35  *
  36  *     VALUE            :=      '('  EXPRESSION  ')'
  37  *                       |      '!'  VALUE
  38  *                       |      '-'  VALUE
  39  *                       |      '~'  VALUE
  40  *                       |      'defined'  '('  variable  ')'
  41  *                       |      variable
  42  *                       |      number
  43  *
  44  *     BINOP            :=      '*'     |  '/'  |  '%'
  45  *                       |      '+'     |  '-'
  46  *                       |      '<<'    |  '>>'
  47  *                       |      '<'     |  '>'  |  '<='  |  '>='
  48  *                       |      '=='    |  '!='
  49  *                       |      '&'     |  '^'  |  '|'
  50  *                       |      '&&'    |  '||'
  51  *
  52  * The normal C order of precedence is supported.
  53  *
  54  *
  55  * External Entry Points:
  56  *
  57  *     ParseIfExpression                parse a string for #if
  58  */
  59
  60 /* $XFree86: xc/config/makedepend/ifparser.h,v 3.5 2001/07/25 15:04:40 dawes Exp $ */
  61
  62 #include <stdio.h>
  63
  64 typedef int Bool;
  65 #define False 0
  66 #define True 1
  67
  68 typedef struct _if_parser {
  69     struct {                            /* functions */
  70         const char *(*handle_error) (struct _if_parser *, const char *,
  71                                      const char *);
  72         long (*eval_variable) (struct _if_parser *, const char *, int);
  73         int (*eval_defined) (struct _if_parser *, const char *, int);
  74     } funcs;
  75     char *data;
  76 } IfParser;
  77
  78 const char *ParseIfExpression (
  79     IfParser *,
  80     const char *,
  81     long *
  82 );
  83