bfd/filemode.c

   1 /* filemode.c -- make a string describing file modes
   2    Copyright (C) 1985, 1990 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 2 of the License, or
   7 (at your option) 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include "sysdep.h"
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21
  22 void mode_string ();
  23 static char ftypelet ();
  24 static void rwx ();
  25 static void setst ();
  26
  27 /* filemodestring - fill in string STR with an ls-style ASCII
  28    representation of the st_mode field of file stats block STATP.
  29    10 characters are stored in STR; no terminating null is added.
  30    The characters stored in STR are:
  31
  32    0    File type.  'd' for directory, 'c' for character
  33         special, 'b' for block special, 'm' for multiplex,
  34         'l' for symbolic link, 's' for socket, 'p' for fifo,
  35         '-' for any other file type
  36
  37    1    'r' if the owner may read, '-' otherwise.
  38
  39    2    'w' if the owner may write, '-' otherwise.
  40
  41    3    'x' if the owner may execute, 's' if the file is
  42         set-user-id, '-' otherwise.
  43         'S' if the file is set-user-id, but the execute
  44         bit isn't set.
  45
  46    4    'r' if group members may read, '-' otherwise.
  47
  48    5    'w' if group members may write, '-' otherwise.
  49
  50    6    'x' if group members may execute, 's' if the file is
  51         set-group-id, '-' otherwise.
  52         'S' if it is set-group-id but not executable.
  53
  54    7    'r' if any user may read, '-' otherwise.
  55
  56    8    'w' if any user may write, '-' otherwise.
  57
  58    9    'x' if any user may execute, 't' if the file is "sticky"
  59         (will be retained in swap space after execution), '-'
  60         otherwise.
  61         'T' if the file is sticky but not executable. */
  62
  63 void
  64 filemodestring (statp, str)
  65      struct stat *statp;
  66      char *str;
  67 {
  68   mode_string (statp->st_mode, str);
  69 }
  70
  71 /* Like filemodestring, but only the relevant part of the `struct stat'
  72    is given as an argument. */
  73
  74 void
  75 mode_string (mode, str)
  76      unsigned short mode;
  77      char *str;
  78 {
  79   str[0] = ftypelet (mode);
  80   rwx ((mode & 0700) << 0, &str[1]);
  81   rwx ((mode & 0070) << 3, &str[4]);
  82   rwx ((mode & 0007) << 6, &str[7]);
  83   setst (mode, str);
  84 }
  85
  86 /* Return a character indicating the type of file described by
  87    file mode BITS:
  88    'd' for directories
  89    'b' for block special files
  90    'c' for character special files
  91    'm' for multiplexor files
  92    'l' for symbolic links
  93    's' for sockets
  94    'p' for fifos
  95    '-' for any other file type. */
  96
  97 static char
  98 ftypelet (bits)
  99      unsigned short bits;
 100 {
 101   switch (bits & S_IFMT)
 102     {
 103     default:
 104       return '-';
 105     case S_IFDIR:
 106       return 'd';
 107 #ifdef S_IFLNK
 108     case S_IFLNK:
 109       return 'l';
 110 #endif
 111 #ifdef S_IFCHR
 112     case S_IFCHR:
 113       return 'c';
 114 #endif
 115 #ifdef S_IFBLK
 116     case S_IFBLK:
 117       return 'b';
 118 #endif
 119 #ifdef S_IFMPC
 120     case S_IFMPC:
 121     case S_IFMPB:
 122       return 'm';
 123 #endif
 124 #ifdef S_IFSOCK
 125     case S_IFSOCK:
 126       return 's';
 127 #endif
 128 #ifdef S_IFIFO
 129 #if S_IFIFO != S_IFSOCK
 130     case S_IFIFO:
 131       return 'p';
 132 #endif
 133 #endif
 134 #ifdef S_IFNWK                  /* HP-UX */
 135     case S_IFNWK:
 136       return 'n';
 137 #endif
 138     }
 139 }
 140
 141 /* Look at read, write, and execute bits in BITS and set
 142    flags in CHARS accordingly. */
 143
 144 static void
 145 rwx (bits, chars)
 146      unsigned short bits;
 147      char *chars;
 148 {
 149   chars[0] = (bits & S_IREAD) ? 'r' : '-';
 150   chars[1] = (bits & S_IWRITE) ? 'w' : '-';
 151   chars[2] = (bits & S_IEXEC) ? 'x' : '-';
 152 }
 153
 154 /* Set the 's' and 't' flags in file attributes string CHARS,
 155    according to the file mode BITS. */
 156
 157 static void
 158 setst (bits, chars)
 159      unsigned short bits;
 160      char *chars;
 161 {
 162 #ifdef S_ISUID
 163   if (bits & S_ISUID)
 164     {
 165       if (chars[3] != 'x')
 166         /* Set-uid, but not executable by owner. */
 167         chars[3] = 'S';
 168       else
 169         chars[3] = 's';
 170     }
 171 #endif
 172 #ifdef S_ISGID
 173   if (bits & S_ISGID)
 174     {
 175       if (chars[6] != 'x')
 176         /* Set-gid, but not executable by group. */
 177         chars[6] = 'S';
 178       else
 179         chars[6] = 's';
 180     }
 181 #endif
 182 #ifdef S_ISVTX
 183   if (bits & S_ISVTX)
 184     {
 185       if (chars[9] != 'x')
 186         /* Sticky, but not executable by others. */
 187         chars[9] = 'T';
 188       else
 189         chars[9] = 't';
 190     }
 191 #endif
 192 }
 193
 194