lib/permstring.c

   1 /*
   2  * A single utility routine.
   3  *
   4  * Copyright (C) 1996 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2003-2019 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24
  25 /* Produce a string representation of Unix mode bits like that used by ls(1).
  26  * The "buf" buffer must be at least 11 characters. */
  27 void permstring(char *perms, mode_t mode)
  28 {
  29         static const char *perm_map = "rwxrwxrwx";
  30         int i;
  31
  32         strlcpy(perms, "----------", 11);
  33
  34         for (i = 0; i < 9; i++) {
  35                 if (mode & (1 << i))
  36                         perms[9-i] = perm_map[8-i];
  37         }
  38
  39         /* Handle setuid/sticky bits.  You might think the indices are
  40          * off by one, but remember there's a type char at the
  41          * start.  */
  42         if (mode & S_ISUID)
  43                 perms[3] = (mode & S_IXUSR) ? 's' : 'S';
  44
  45         if (mode & S_ISGID)
  46                 perms[6] = (mode & S_IXGRP) ? 's' : 'S';
  47
  48 #ifdef S_ISVTX
  49         if (mode & S_ISVTX)
  50                 perms[9] = (mode & S_IXOTH) ? 't' : 'T';
  51 #endif
  52
  53         if (S_ISDIR(mode))
  54                 perms[0] = 'd';
  55         else if (S_ISLNK(mode))
  56                 perms[0] = 'l';
  57         else if (S_ISBLK(mode))
  58                 perms[0] = 'b';
  59         else if (S_ISCHR(mode))
  60                 perms[0] = 'c';
  61         else if (S_ISSOCK(mode))
  62                 perms[0] = 's';
  63         else if (S_ISFIFO(mode))
  64                 perms[0] = 'p';
  65 }