194 lines
4.4 KiB
C
194 lines
4.4 KiB
C
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/* filemode.c -- make a string describing file modes
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Copyright (C) 1985, 1990 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <sys/types.h>
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#include <sys/stat.h>
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void mode_string ();
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static char ftypelet ();
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static void rwx ();
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static void setst ();
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/* filemodestring - fill in string STR with an ls-style ASCII
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representation of the st_mode field of file stats block STATP.
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10 characters are stored in STR; no terminating null is added.
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The characters stored in STR are:
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0 File type. 'd' for directory, 'c' for character
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special, 'b' for block special, 'm' for multiplex,
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'l' for symbolic link, 's' for socket, 'p' for fifo,
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'-' for any other file type
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1 'r' if the owner may read, '-' otherwise.
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2 'w' if the owner may write, '-' otherwise.
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3 'x' if the owner may execute, 's' if the file is
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set-user-id, '-' otherwise.
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'S' if the file is set-user-id, but the execute
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bit isn't set.
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4 'r' if group members may read, '-' otherwise.
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5 'w' if group members may write, '-' otherwise.
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6 'x' if group members may execute, 's' if the file is
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set-group-id, '-' otherwise.
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'S' if it is set-group-id but not executable.
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7 'r' if any user may read, '-' otherwise.
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8 'w' if any user may write, '-' otherwise.
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9 'x' if any user may execute, 't' if the file is "sticky"
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(will be retained in swap space after execution), '-'
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otherwise.
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'T' if the file is sticky but not executable. */
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void
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filemodestring (statp, str)
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struct stat *statp;
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char *str;
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{
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mode_string (statp->st_mode, str);
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}
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/* Like filemodestring, but only the relevant part of the `struct stat'
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is given as an argument. */
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void
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mode_string (mode, str)
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unsigned short mode;
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char *str;
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{
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str[0] = ftypelet (mode);
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rwx ((mode & 0700) << 0, &str[1]);
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rwx ((mode & 0070) << 3, &str[4]);
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rwx ((mode & 0007) << 6, &str[7]);
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setst (mode, str);
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}
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/* Return a character indicating the type of file described by
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file mode BITS:
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'd' for directories
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'b' for block special files
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'c' for character special files
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'm' for multiplexor files
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'l' for symbolic links
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's' for sockets
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'p' for fifos
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'-' for any other file type. */
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static char
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ftypelet (bits)
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unsigned short bits;
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{
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switch (bits & S_IFMT)
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{
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default:
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return '-';
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case S_IFDIR:
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return 'd';
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#ifdef S_IFLNK
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case S_IFLNK:
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return 'l';
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#endif
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#ifdef S_IFCHR
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case S_IFCHR:
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return 'c';
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#endif
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#ifdef S_IFBLK
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case S_IFBLK:
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return 'b';
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#endif
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#ifdef S_IFMPC
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case S_IFMPC:
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case S_IFMPB:
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return 'm';
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#endif
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#ifdef S_IFSOCK
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case S_IFSOCK:
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return 's';
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#endif
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#ifdef S_IFIFO
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#if S_IFIFO != S_IFSOCK
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case S_IFIFO:
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return 'p';
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#endif
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#endif
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#ifdef S_IFNWK /* HP-UX */
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case S_IFNWK:
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return 'n';
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#endif
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}
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}
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/* Look at read, write, and execute bits in BITS and set
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flags in CHARS accordingly. */
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static void
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rwx (bits, chars)
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unsigned short bits;
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char *chars;
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{
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chars[0] = (bits & S_IREAD) ? 'r' : '-';
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chars[1] = (bits & S_IWRITE) ? 'w' : '-';
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chars[2] = (bits & S_IEXEC) ? 'x' : '-';
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}
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/* Set the 's' and 't' flags in file attributes string CHARS,
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according to the file mode BITS. */
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static void
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setst (bits, chars)
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unsigned short bits;
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char *chars;
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{
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#ifdef S_ISUID
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if (bits & S_ISUID)
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{
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if (chars[3] != 'x')
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/* Set-uid, but not executable by owner. */
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chars[3] = 'S';
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else
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chars[3] = 's';
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}
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#endif
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#ifdef S_ISGID
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if (bits & S_ISGID)
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{
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if (chars[6] != 'x')
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/* Set-gid, but not executable by group. */
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chars[6] = 'S';
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else
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chars[6] = 's';
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}
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#endif
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#ifdef S_ISVTX
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if (bits & S_ISVTX)
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{
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if (chars[9] != 'x')
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/* Sticky, but not executable by others. */
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chars[9] = 'T';
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else
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chars[9] = 't';
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}
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#endif
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}
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