src/filemode.c

   1 /* filemode.c -- make a string describing file modes
   2    Copyright (C) 1985, 1990, 1993, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007, 2008, 2009, 2010, 2011  Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  18    USA.  */
  19 \f
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26
  27 #if !S_IRUSR
  28 # if S_IREAD
  29 #  define S_IRUSR S_IREAD
  30 # else
  31 #  define S_IRUSR 00400
  32 # endif
  33 #endif
  34
  35 #if !S_IWUSR
  36 # if S_IWRITE
  37 #  define S_IWUSR S_IWRITE
  38 # else
  39 #  define S_IWUSR 00200
  40 # endif
  41 #endif
  42
  43 #if !S_IXUSR
  44 # if S_IEXEC
  45 #  define S_IXUSR S_IEXEC
  46 # else
  47 #  define S_IXUSR 00100
  48 # endif
  49 #endif
  50
  51 #ifdef STAT_MACROS_BROKEN
  52 #undef S_ISBLK
  53 #undef S_ISCHR
  54 #undef S_ISDIR
  55 #undef S_ISFIFO
  56 #undef S_ISLNK
  57 #undef S_ISMPB
  58 #undef S_ISMPC
  59 #undef S_ISNWK
  60 #undef S_ISREG
  61 #undef S_ISSOCK
  62 #endif /* STAT_MACROS_BROKEN.  */
  63
  64 #if !defined(S_ISBLK) && defined(S_IFBLK)
  65 #define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
  66 #endif
  67 #if !defined(S_ISCHR) && defined(S_IFCHR)
  68 #define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
  69 #endif
  70 #if !defined(S_ISDIR) && defined(S_IFDIR)
  71 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
  72 #endif
  73 #if !defined(S_ISREG) && defined(S_IFREG)
  74 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
  75 #endif
  76 #if !defined(S_ISFIFO) && defined(S_IFIFO)
  77 #define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
  78 #endif
  79 #if !defined(S_ISLNK) && defined(S_IFLNK)
  80 #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
  81 #endif
  82 #if !defined(S_ISSOCK) && defined(S_IFSOCK)
  83 #define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
  84 #endif
  85 #if !defined(S_ISMPB) && defined(S_IFMPB) /* V7 */
  86 #define S_ISMPB(m) (((m) & S_IFMT) == S_IFMPB)
  87 #define S_ISMPC(m) (((m) & S_IFMT) == S_IFMPC)
  88 #endif
  89 #if !defined(S_ISNWK) && defined(S_IFNWK) /* HP/UX */
  90 #define S_ISNWK(m) (((m) & S_IFMT) == S_IFNWK)
  91 #endif
  92
  93 void mode_string ();
  94 static char ftypelet ();
  95 static void rwx ();
  96 static void setst ();
  97
  98 /* filemodestring - fill in string STR with an ls-style ASCII
  99    representation of the st_mode field of file stats block STATP.
 100    10 characters are stored in STR; no terminating null is added.
 101    The characters stored in STR are:
 102
 103    0    File type.  'd' for directory, 'c' for character
 104         special, 'b' for block special, 'm' for multiplex,
 105         'l' for symbolic link, 's' for socket, 'p' for fifo,
 106         '-' for regular, '?' for any other file type
 107
 108    1    'r' if the owner may read, '-' otherwise.
 109
 110    2    'w' if the owner may write, '-' otherwise.
 111
 112    3    'x' if the owner may execute, 's' if the file is
 113         set-user-id, '-' otherwise.
 114         'S' if the file is set-user-id, but the execute
 115         bit isn't set.
 116
 117    4    'r' if group members may read, '-' otherwise.
 118
 119    5    'w' if group members may write, '-' otherwise.
 120
 121    6    'x' if group members may execute, 's' if the file is
 122         set-group-id, '-' otherwise.
 123         'S' if it is set-group-id but not executable.
 124
 125    7    'r' if any user may read, '-' otherwise.
 126
 127    8    'w' if any user may write, '-' otherwise.
 128
 129    9    'x' if any user may execute, 't' if the file is "sticky"
 130         (will be retained in swap space after execution), '-'
 131         otherwise.
 132         'T' if the file is sticky but not executable.  */
 133
 134 void
 135 filemodestring (statp, str)
 136      struct stat *statp;
 137      char *str;
 138 {
 139   mode_string (statp->st_mode, str);
 140 }
 141
 142 /* Like filemodestring, but only the relevant part of the `struct stat'
 143    is given as an argument.  */
 144
 145 void
 146 mode_string (mode, str)
 147      unsigned short mode;
 148      char *str;
 149 {
 150   str[0] = ftypelet ((long) mode);
 151   rwx ((mode & 0700) << 0, &str[1]);
 152   rwx ((mode & 0070) << 3, &str[4]);
 153   rwx ((mode & 0007) << 6, &str[7]);
 154   setst (mode, str);
 155 }
 156
 157 /* Return a character indicating the type of file described by
 158    file mode BITS:
 159    'd' for directories
 160    'b' for block special files
 161    'c' for character special files
 162    'm' for multiplexor files
 163    'l' for symbolic links
 164    's' for sockets
 165    'p' for fifos
 166    '-' for regular files
 167    '?' for any other file type.  */
 168
 169 static char
 170 ftypelet (bits)
 171      long bits;
 172 {
 173 #ifdef S_ISBLK
 174   if (S_ISBLK (bits))
 175     return 'b';
 176 #endif
 177   if (S_ISCHR (bits))
 178     return 'c';
 179   if (S_ISDIR (bits))
 180     return 'd';
 181   if (S_ISREG (bits))
 182     return '-';
 183 #ifdef S_ISFIFO
 184   if (S_ISFIFO (bits))
 185     return 'p';
 186 #endif
 187 #ifdef S_ISLNK
 188   if (S_ISLNK (bits))
 189     return 'l';
 190 #endif
 191 #ifdef S_ISSOCK
 192   if (S_ISSOCK (bits))
 193     return 's';
 194 #endif
 195 #ifdef S_ISMPC
 196   if (S_ISMPC (bits))
 197     return 'm';
 198 #endif
 199 #ifdef S_ISNWK
 200   if (S_ISNWK (bits))
 201     return 'n';
 202 #endif
 203   return '?';
 204 }
 205
 206 /* Look at read, write, and execute bits in BITS and set
 207    flags in CHARS accordingly.  */
 208
 209 static void
 210 rwx (bits, chars)
 211      unsigned short bits;
 212      char *chars;
 213 {
 214   chars[0] = (bits & S_IRUSR) ? 'r' : '-';
 215   chars[1] = (bits & S_IWUSR) ? 'w' : '-';
 216   chars[2] = (bits & S_IXUSR) ? 'x' : '-';
 217 }
 218
 219 /* Set the 's' and 't' flags in file attributes string CHARS,
 220    according to the file mode BITS.  */
 221
 222 static void
 223 setst (bits, chars)
 224      unsigned short bits;
 225      char *chars;
 226 {
 227 #ifdef S_ISUID
 228   if (bits & S_ISUID)
 229     {
 230       if (chars[3] != 'x')
 231         /* Set-uid, but not executable by owner.  */
 232         chars[3] = 'S';
 233       else
 234         chars[3] = 's';
 235     }
 236 #endif
 237 #ifdef S_ISGID
 238   if (bits & S_ISGID)
 239     {
 240       if (chars[6] != 'x')
 241         /* Set-gid, but not executable by group.  */
 242         chars[6] = 'S';
 243       else
 244         chars[6] = 's';
 245     }
 246 #endif
 247 #ifdef S_ISVTX
 248   if (bits & S_ISVTX)
 249     {
 250       if (chars[9] != 'x')
 251         /* Sticky, but not executable by others.  */
 252         chars[9] = 'T';
 253       else
 254         chars[9] = 't';
 255     }
 256 #endif
 257 }
 258
 259 /* arch-tag: 4340830c-15a5-47d2-b45f-1d43c45a91bb
 260    (do not change this comment) */