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/* 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. */
/* 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
struct mode_change *mode_compile __P ((const char *, unsigned));
unsigned short mode_adjust __P ((unsigned, const struct mode_change *));
void mode_free __P ((struct mode_change *));
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