lib/modechange.h

   1 /* modechange.h -- definitions for file mode manipulation
   2    Copyright (C) 1989, 1990 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
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Masks for the `flags' field in a `struct mode_change'. */
  19
  20 /* Affect the execute bits only if at least one execute bit is set already,
  21    or if the file is a directory. */
  22 #define MODE_X_IF_ANY_X 01
  23
  24 /* If set, copy some existing permissions for u, g, or o onto the other two.
  25    Which of u, g, or o is copied is determined by which bits are set in the
  26    `value' field. */
  27 #define MODE_COPY_EXISTING 02
  28
  29 struct mode_change
  30 {
  31   char op;                      /* One of "=+-". */
  32   char flags;                   /* Special operations. */
  33   unsigned short affected;      /* Set for u/g/o/s/s/t, if to be affected. */
  34   unsigned short value;         /* Bits to add/remove. */
  35   struct mode_change *next;     /* Link to next change in list. */
  36 };
  37
  38 /* Masks for mode_compile argument. */
  39 #define MODE_MASK_EQUALS 1
  40 #define MODE_MASK_PLUS 2
  41 #define MODE_MASK_MINUS 4
  42
  43 /* Error return values for mode_compile. */
  44 #define MODE_INVALID (struct mode_change *) 0
  45 #define MODE_MEMORY_EXHAUSTED (struct mode_change *) 1
  46
  47 #ifdef __STDC__
  48 struct mode_change *mode_compile (char *, unsigned);
  49 unsigned short mode_adjust (unsigned, struct mode_change *);
  50 void mode_free (struct mode_change *);
  51 #else
  52 struct mode_change *mode_compile ();
  53 unsigned short mode_adjust ();
  54 void mode_free ();
  55 #endif