XEmacs 21.2-b1

[chise/xemacs-chise.git.1] / src / filemode.c

diff --git a/src/filemode.c b/src/filemode.c
new file mode 100644 (file)
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+++ b/src/filemode.c
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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, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Synched up with: FSF 19.30. */
+
+#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_IRUSR) ? 'r' : '-';
+  chars[1] = (bits & S_IWUSR) ? 'w' : '-';
+  chars[2] = (bits & S_IXUSR) ? '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
+}