/* 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 }