binutils/filemode.c

   1 /* filemode.c -- make a string describing file modes
   2    Copyright (C) 1985-2017 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  17    02110-1301, USA.  */
  18 \f
  19 #include "sysdep.h"
  20 #include "bfd.h"
  21 #include "bucomm.h"
  22
  23 static char ftypelet (unsigned long);
  24 static void setst (unsigned long, char *);
  25
  26 /* filemodestring - fill in string STR with an ls-style ASCII
  27    representation of the st_mode field of file stats block STATP.
  28    10 characters are stored in STR; no terminating null is added.
  29    The characters stored in STR are:
  30
  31    0    File type.  'd' for directory, 'c' for character
  32         special, 'b' for block special, 'm' for multiplex,
  33         'l' for symbolic link, 's' for socket, 'p' for fifo,
  34         '-' for any other file type
  35
  36    1    'r' if the owner may read, '-' otherwise.
  37
  38    2    'w' if the owner may write, '-' otherwise.
  39
  40    3    'x' if the owner may execute, 's' if the file is
  41         set-user-id, '-' otherwise.
  42         'S' if the file is set-user-id, but the execute
  43         bit isn't set.
  44
  45    4    'r' if group members may read, '-' otherwise.
  46
  47    5    'w' if group members may write, '-' otherwise.
  48
  49    6    'x' if group members may execute, 's' if the file is
  50         set-group-id, '-' otherwise.
  51         'S' if it is set-group-id but not executable.
  52
  53    7    'r' if any user may read, '-' otherwise.
  54
  55    8    'w' if any user may write, '-' otherwise.
  56
  57    9    'x' if any user may execute, 't' if the file is "sticky"
  58         (will be retained in swap space after execution), '-'
  59         otherwise.
  60         'T' if the file is sticky but not executable.  */
  61
  62 /* Get definitions for the file permission bits.  */
  63
  64 #ifndef S_IRWXU
  65 #define S_IRWXU 0700
  66 #endif
  67 #ifndef S_IRUSR
  68 #define S_IRUSR 0400
  69 #endif
  70 #ifndef S_IWUSR
  71 #define S_IWUSR 0200
  72 #endif
  73 #ifndef S_IXUSR
  74 #define S_IXUSR 0100
  75 #endif
  76
  77 #ifndef S_IRWXG
  78 #define S_IRWXG 0070
  79 #endif
  80 #ifndef S_IRGRP
  81 #define S_IRGRP 0040
  82 #endif
  83 #ifndef S_IWGRP
  84 #define S_IWGRP 0020
  85 #endif
  86 #ifndef S_IXGRP
  87 #define S_IXGRP 0010
  88 #endif
  89
  90 #ifndef S_IRWXO
  91 #define S_IRWXO 0007
  92 #endif
  93 #ifndef S_IROTH
  94 #define S_IROTH 0004
  95 #endif
  96 #ifndef S_IWOTH
  97 #define S_IWOTH 0002
  98 #endif
  99 #ifndef S_IXOTH
 100 #define S_IXOTH 0001
 101 #endif
 102
 103 /* Like filemodestring, but only the relevant part of the `struct stat'
 104    is given as an argument.  */
 105
 106 void
 107 mode_string (unsigned long mode, char *str)
 108 {
 109   str[0] = ftypelet ((unsigned long) mode);
 110   str[1] = (mode & S_IRUSR) != 0 ? 'r' : '-';
 111   str[2] = (mode & S_IWUSR) != 0 ? 'w' : '-';
 112   str[3] = (mode & S_IXUSR) != 0 ? 'x' : '-';
 113   str[4] = (mode & S_IRGRP) != 0 ? 'r' : '-';
 114   str[5] = (mode & S_IWGRP) != 0 ? 'w' : '-';
 115   str[6] = (mode & S_IXGRP) != 0 ? 'x' : '-';
 116   str[7] = (mode & S_IROTH) != 0 ? 'r' : '-';
 117   str[8] = (mode & S_IWOTH) != 0 ? 'w' : '-';
 118   str[9] = (mode & S_IXOTH) != 0 ? 'x' : '-';
 119   setst ((unsigned long) mode, str);
 120 }
 121
 122 /* Return a character indicating the type of file described by
 123    file mode BITS:
 124    'd' for directories
 125    'b' for block special files
 126    'c' for character special files
 127    'm' for multiplexer files
 128    'l' for symbolic links
 129    's' for sockets
 130    'p' for fifos
 131    '-' for any other file type.  */
 132
 133 #ifndef S_ISDIR
 134 #ifdef S_IFDIR
 135 #define S_ISDIR(i) (((i) & S_IFMT) == S_IFDIR)
 136 #else /* ! defined (S_IFDIR) */
 137 #define S_ISDIR(i) (((i) & 0170000) == 040000)
 138 #endif /* ! defined (S_IFDIR) */
 139 #endif /* ! defined (S_ISDIR) */
 140
 141 #ifndef S_ISBLK
 142 #ifdef S_IFBLK
 143 #define S_ISBLK(i) (((i) & S_IFMT) == S_IFBLK)
 144 #else /* ! defined (S_IFBLK) */
 145 #define S_ISBLK(i) 0
 146 #endif /* ! defined (S_IFBLK) */
 147 #endif /* ! defined (S_ISBLK) */
 148
 149 #ifndef S_ISCHR
 150 #ifdef S_IFCHR
 151 #define S_ISCHR(i) (((i) & S_IFMT) == S_IFCHR)
 152 #else /* ! defined (S_IFCHR) */
 153 #define S_ISCHR(i) 0
 154 #endif /* ! defined (S_IFCHR) */
 155 #endif /* ! defined (S_ISCHR) */
 156
 157 #ifndef S_ISFIFO
 158 #ifdef S_IFIFO
 159 #define S_ISFIFO(i) (((i) & S_IFMT) == S_IFIFO)
 160 #else /* ! defined (S_IFIFO) */
 161 #define S_ISFIFO(i) 0
 162 #endif /* ! defined (S_IFIFO) */
 163 #endif /* ! defined (S_ISFIFO) */
 164
 165 #ifndef S_ISSOCK
 166 #ifdef S_IFSOCK
 167 #define S_ISSOCK(i) (((i) & S_IFMT) == S_IFSOCK)
 168 #else /* ! defined (S_IFSOCK) */
 169 #define S_ISSOCK(i) 0
 170 #endif /* ! defined (S_IFSOCK) */
 171 #endif /* ! defined (S_ISSOCK) */
 172
 173 #ifndef S_ISLNK
 174 #ifdef S_IFLNK
 175 #define S_ISLNK(i) (((i) & S_IFMT) == S_IFLNK)
 176 #else /* ! defined (S_IFLNK) */
 177 #define S_ISLNK(i) 0
 178 #endif /* ! defined (S_IFLNK) */
 179 #endif /* ! defined (S_ISLNK) */
 180
 181 static char
 182 ftypelet (unsigned long bits)
 183 {
 184   if (S_ISDIR (bits))
 185     return 'd';
 186   if (S_ISLNK (bits))
 187     return 'l';
 188   if (S_ISBLK (bits))
 189     return 'b';
 190   if (S_ISCHR (bits))
 191     return 'c';
 192   if (S_ISSOCK (bits))
 193     return 's';
 194   if (S_ISFIFO (bits))
 195     return 'p';
 196
 197 #ifdef S_IFMT
 198 #ifdef S_IFMPC
 199   if ((bits & S_IFMT) == S_IFMPC
 200       || (bits & S_IFMT) == S_IFMPB)
 201     return 'm';
 202 #endif
 203 #ifdef S_IFNWK
 204   if ((bits & S_IFMT) == S_IFNWK)
 205     return 'n';
 206 #endif
 207 #endif
 208
 209   return '-';
 210 }
 211
 212 /* Set the 's' and 't' flags in file attributes string CHARS,
 213    according to the file mode BITS.  */
 214
 215 static void
 216 setst (unsigned long bits ATTRIBUTE_UNUSED, char *chars ATTRIBUTE_UNUSED)
 217 {
 218 #ifdef S_ISUID
 219   if (bits & S_ISUID)
 220     {
 221       if (chars[3] != 'x')
 222         /* Set-uid, but not executable by owner.  */
 223         chars[3] = 'S';
 224       else
 225         chars[3] = 's';
 226     }
 227 #endif
 228 #ifdef S_ISGID
 229   if (bits & S_ISGID)
 230     {
 231       if (chars[6] != 'x')
 232         /* Set-gid, but not executable by group.  */
 233         chars[6] = 'S';
 234       else
 235         chars[6] = 's';
 236     }
 237 #endif
 238 #ifdef S_ISVTX
 239   if (bits & S_ISVTX)
 240     {
 241       if (chars[9] != 'x')
 242         /* Sticky, but not executable by others.  */
 243         chars[9] = 'T';
 244       else
 245         chars[9] = 't';
 246     }
 247 #endif
 248 }