lib/modechange.h

   1 /* modechange.h -- definitions for file mode manipulation
   2    Copyright (C) 1989, 1990, 1997 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Masks for the `flags' field in a `struct mode_change'. */
  19
  20 #if ! defined MODECHANGE_H_
  21 # define MODECHANGE_H_
  22
  23 /* Affect the execute bits only if at least one execute bit is set already,
  24    or if the file is a directory. */
  25 # define MODE_X_IF_ANY_X 01
  26
  27 /* If set, copy some existing permissions for u, g, or o onto the other two.
  28    Which of u, g, or o is copied is determined by which bits are set in the
  29    `value' field. */
  30 # define MODE_COPY_EXISTING 02
  31
  32 struct mode_change
  33 {
  34   char op;                      /* One of "=+-". */
  35   char flags;                   /* Special operations. */
  36   unsigned short affected;      /* Set for u/g/o/s/s/t, if to be affected. */
  37   unsigned short value;         /* Bits to add/remove. */
  38   struct mode_change *next;     /* Link to next change in list. */
  39 };
  40
  41 /* Masks for mode_compile argument. */
  42 # define MODE_MASK_EQUALS 1
  43 # define MODE_MASK_PLUS 2
  44 # define MODE_MASK_MINUS 4
  45 # define MODE_MASK_ALL (MODE_MASK_EQUALS | MODE_MASK_PLUS | MODE_MASK_MINUS)
  46
  47 /* Error return values for mode_compile. */
  48 # define MODE_INVALID (struct mode_change *) 0
  49 # define MODE_MEMORY_EXHAUSTED (struct mode_change *) 1
  50 # define MODE_BAD_REFERENCE (struct mode_change *) 2
  51
  52 # ifndef PARAMS
  53 #  if defined PROTOTYPES || (defined __STDC__ && __STDC__)
  54 #   define PARAMS(Args) Args
  55 #  else
  56 #   define PARAMS(Args) ()
  57 #  endif
  58 # endif
  59
  60 struct mode_change *mode_compile PARAMS ((const char *, unsigned));
  61 struct mode_change *mode_create_from_ref PARAMS ((const char *));
  62 unsigned short mode_adjust PARAMS ((unsigned, const struct mode_change *));
  63 void mode_free PARAMS ((struct mode_change *));
  64
  65 #endif