/usr/include/xbase/xstack.h is in libxbase2.0-dev 2.0.0-8.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97  | /*  $Id: xstack.h,v 1.5 2000/11/10 19:04:17 dbryson Exp $
    Xbase project source code
  
    This file conatains a header file for the xbStack object which
    is used for handling expressions.
    Copyright (C) 1997  Startech, Gary A. Kunkel   
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    Contact:
      Mail:
        Technology Associates, Inc.
        XBase Project
        1455 Deming Way #11
        Sparks, NV 89434
        USA
      Email:
        xbase@techass.com
      See our website at:
        xdb.sourceforge.net
    V 1.0   10/10/97   - Initial release of software
    V 1.5   1/2/97     - Added memo field support
    V 1.6a  4/1/98     - Added expression support
    V 1.6b  4/8/98     - Numeric index keys 
*/
/*! \file xstack.h
*/
#ifndef __XB_STACK_H__
#define __XB_STACK_H__
#ifdef __GNUG__
#pragma interface
#endif
#include <xbase/xtypes.h>
//! xbStackElement struct
/*!
*/
struct xbStackElement{
   xbStackElement * Previous;
   xbStackElement * Next;
   void * UserPtr;
};
//! xbStack class
/*!
*/
class XBDLLEXPORT xbStack{
 public:
   xbStack( void );
   void    InitStack( void );
   void *  Pop( void );
   xbShort Push( void * );
   //! Short description.
   /*!
   */
   xbShort GetStackDepth( void ) { return StackDepth; }
   void    DumpStack( void );
 protected:
   xbShort StackDepth;
   xbStackElement * First;
   xbStackElement * Last;
   xbStackElement * Free;          /* points to free stack items */
   xbStackElement * GetStackElement( void );
   void FreeStackElement( xbStackElement * );
};
#endif               // __XB_STACK_H__
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