/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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*  ========================================================================
*
* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/



enum    special_macros {
        MACRO_LINE,
        MACRO_FILE,
        MACRO_DATE,
        MACRO_TIME,
        MACRO_STDC,
        MACRO_FUNC,
 };

struct  macro_parm {
        struct  macro_parm *next_macro_parm;
        char    *parm;
};

/* Actual macro definition is at (char *)mentry + mentry->macro_defn */
enum macro_flags {
        MACRO_DEFINED_BEFORE_FIRST_INCLUDE  =   0x01,
        MACRO_CAN_BE_REDEFINED              =   0x02,
        MACRO_USER_DEFINED                  =   0x04,
        MACRO_REFERENCED                    =   0x08,
};

typedef struct  macro_entry {
        union {
            struct  macro_entry __FAR *next_macro;
            int         macro_index;    /* for pre-compiled header */
        };
#if _HOST == 386
        unsigned short macro_defn;/* offset to defn, 0 ==>special macro name*/
        unsigned short macro_len;/* length of macro definition */
        char    parm_count;     /* special macro indicator if defn == 0 */
        char    macro_flags;    /* flags */
#else
        unsigned macro_defn;    /* offset to defn, 0 ==>special macro name*/
        unsigned macro_len;     /* length of macro definition */
        unsigned parm_count;    /* special macro indicator if defn == 0 */
        unsigned macro_flags;   /* flags */
#endif
        char    macro_name[1];  /* name,parms, and macro definition */
} MEDEFN, *MEPTR;

typedef struct  macro_stack {
        struct  macro_stack *stacked_macro;
        MEPTR   prev_macro;
        char    **macro_parms;  /* pointer to array of actual parms */
        char    *prev_ptr;
        int     macro_class;    /* T_MACRO or T_MACRO_PARM */
        char    macro_definition[1]; /* copy of current macro definition */
} MSTACK, *MSTACKPTR;

