/* modechange.h -- definitions for file mode manipulation

   Copyright (C) 1989, 1990 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2, or (at your option)

   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software Foundation,

   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef _MODECHANGE_H

#define _MODECHANGE_H

#ifndef STATIC

#define STATIC

#endif

/* Masks for the `flags' field in a `struct mode_change'. */

/* Affect the execute bits only if at least one execute bit is set already,

   or if the file is a directory. */

#define MODE_X_IF_ANY_X 01

/* If set, copy some existing permissions for u, g, or o onto the other two.

   Which of u, g, or o is copied is determined by which bits are set in the

   `value' field. */

#define MODE_COPY_EXISTING 02

struct mode_change

{

  char op;			/* One of "=+-". */

  char flags;			/* Special operations. */

  unsigned short affected;	/* Set for u/g/o/s/s/t, if to be affected. */

  unsigned short value;		/* Bits to add/remove. */

  struct mode_change *next;	/* Link to next change in list. */

};

/* Masks for mode_compile argument. */

#define MODE_MASK_EQUALS 1

#define MODE_MASK_PLUS 2

#define MODE_MASK_MINUS 4

/* Error return values for mode_compile. */

#define MODE_INVALID (struct mode_change *) 0

#define MODE_MEMORY_EXHAUSTED (struct mode_change *) 1

#ifndef __P

# if defined (__GNUC__) || (defined (__STDC__) && __STDC__)

#  define __P(Args) Args

# else

#  define __P(Args) ()

# endif

#endif

STATIC struct mode_change *mode_compile __P ((const char *, unsigned));

STATIC unsigned short mode_adjust __P ((unsigned, const struct mode_change *));

STATIC void mode_free __P ((struct mode_change *));

#endif /* _MODECHANGE_H */