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- /* filemode.c -- make a string describing file modes
- Copyright (C) 1985, 1990, 1993 Free Software Foundation, Inc.
-
- This file is part of XEmacs.
-
- XEmacs 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.
-
- XEmacs 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 XEmacs; see the file COPYING. If not, write to the Free
- Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Synched up with: FSF 19.28. */
-
- #include <config.h>
- #include "lisp.h"
-
- #include "sysfile.h"
-
- static void mode_string (unsigned short mode, char *str);
- static char ftypelet (mode_t bits);
- static void rwx (unsigned short bits, char *chars);
- static void setst (unsigned short bits, char *chars);
-
- /* filemodestring - fill in string STR with an ls-style ASCII
- representation of the st_mode field of file stats block STATP.
- 10 characters are stored in STR; no terminating null is added.
- The characters stored in STR are:
-
- 0 File type. 'd' for directory, 'c' for character
- special, 'b' for block special, 'm' for multiplex,
- 'l' for symbolic link, 's' for socket, 'p' for fifo,
- '-' for regular, '?' for any other file type
-
- 1 'r' if the owner may read, '-' otherwise.
-
- 2 'w' if the owner may write, '-' otherwise.
-
- 3 'x' if the owner may execute, 's' if the file is
- set-user-id, '-' otherwise.
- 'S' if the file is set-user-id, but the execute
- bit isn't set.
-
- 4 'r' if group members may read, '-' otherwise.
-
- 5 'w' if group members may write, '-' otherwise.
-
- 6 'x' if group members may execute, 's' if the file is
- set-group-id, '-' otherwise.
- 'S' if it is set-group-id but not executable.
-
- 7 'r' if any user may read, '-' otherwise.
-
- 8 'w' if any user may write, '-' otherwise.
-
- 9 'x' if any user may execute, 't' if the file is "sticky"
- (will be retained in swap space after execution), '-'
- otherwise.
- 'T' if the file is sticky but not executable. */
-
- void
- filemodestring (struct stat *statp, char *str)
- {
- mode_string (statp->st_mode, str);
- }
-
- /* Like filemodestring, but only the relevant part of the `struct stat'
- is given as an argument. */
-
- static void
- mode_string (unsigned short mode, char *str)
- {
- str[0] = ftypelet (mode);
- rwx ((mode & 0700) << 0, &str[1]);
- rwx ((mode & 0070) << 3, &str[4]);
- rwx ((mode & 0007) << 6, &str[7]);
- setst (mode, str);
- }
-
- /* Return a character indicating the type of file described by
- file mode BITS:
- 'd' for directories
- 'b' for block special files
- 'c' for character special files
- 'm' for multiplexor files
- 'l' for symbolic links
- 's' for sockets
- 'p' for fifos
- '-' for regular files
- '?' for any other file type. */
-
- static char
- ftypelet (mode_t bits)
- {
- #ifdef S_ISBLK
- if (S_ISBLK (bits))
- return 'b';
- #endif
- if (S_ISCHR (bits))
- return 'c';
- if (S_ISDIR (bits))
- return 'd';
- if (S_ISREG (bits))
- return '-';
- #ifdef S_ISFIFO
- if (S_ISFIFO (bits))
- return 'p';
- #endif
- #ifdef S_ISLNK
- if (S_ISLNK (bits))
- return 'l';
- #endif
- #ifdef S_ISSOCK
- if (S_ISSOCK (bits))
- return 's';
- #endif
- #ifdef S_ISMPC
- if (S_ISMPC (bits))
- return 'm';
- #endif
- #ifdef S_ISNWK
- if (S_ISNWK (bits))
- return 'n';
- #endif
- return '?';
- }
-
- /* Look at read, write, and execute bits in BITS and set
- flags in CHARS accordingly. */
-
- static void
- rwx (unsigned short bits, char *chars)
- {
- chars[0] = (bits & S_IREAD) ? 'r' : '-';
- chars[1] = (bits & S_IWRITE) ? 'w' : '-';
- chars[2] = (bits & S_IEXEC) ? 'x' : '-';
- }
-
- /* Set the 's' and 't' flags in file attributes string CHARS,
- according to the file mode BITS. */
-
- static void
- setst (unsigned short bits, char *chars)
- {
- #ifdef S_ISUID
- if (bits & S_ISUID)
- {
- if (chars[3] != 'x')
- /* Set-uid, but not executable by owner. */
- chars[3] = 'S';
- else
- chars[3] = 's';
- }
- #endif
- #ifdef S_ISGID
- if (bits & S_ISGID)
- {
- if (chars[6] != 'x')
- /* Set-gid, but not executable by group. */
- chars[6] = 'S';
- else
- chars[6] = 's';
- }
- #endif
- #ifdef S_ISVTX
- if (bits & S_ISVTX)
- {
- if (chars[9] != 'x')
- /* Sticky, but not executable by others. */
- chars[9] = 'T';
- else
- chars[9] = 't';
- }
- #endif
- }
-