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/* filemode.c -- make a string describing file modes
Copyright (C) 1985, 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 of the License, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <sys/types.h>
#include <sys/stat.h>
void mode_string ();
static char ftypelet ();
static void rwx ();
static void setst ();
/* 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 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 (statp, str)
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. */
void
mode_string (mode, str)
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 any other file type. */
static char
ftypelet (bits)
unsigned short bits;
{
switch (bits & S_IFMT)
{
default:
return '-';
case S_IFDIR:
return 'd';
#ifdef S_IFLNK
case S_IFLNK:
return 'l';
#endif
#ifdef S_IFCHR
case S_IFCHR:
return 'c';
#endif
#ifdef S_IFBLK
case S_IFBLK:
return 'b';
#endif
#ifdef S_IFMPC
case S_IFMPC:
case S_IFMPB:
return 'm';
#endif
#ifdef S_IFSOCK
case S_IFSOCK:
return 's';
#endif
#ifdef S_IFIFO
#if S_IFIFO != S_IFSOCK
case S_IFIFO:
return 'p';
#endif
#endif
#ifdef S_IFNWK /* HP-UX */
case S_IFNWK:
return 'n';
#endif
}
}
/* Look at read, write, and execute bits in BITS and set
flags in CHARS accordingly. */
static void
rwx (bits, chars)
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 (bits, chars)
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
}
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