xapian-applications/omega/tmpdir.h

   1 /** @file
   2  * @brief create a temporary directory securely
   3  */
   4 /* Copyright (C) 2011,2014 Olly Betts
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifndef OMEGA_INCLUDED_TMPDIR_H
  22 #define OMEGA_INCLUDED_TMPDIR_H
  23
  24 #include <string>
  25
  26 /** Return path to temporary directory.
  27  *
  28  *  If successfully called before, this just returns the same path.
  29  *
  30  *  @return If successful, path to directory; otherwise empty string.
  31  */
  32 const std::string & get_tmpdir();
  33
  34 /** Return temporary filename with specified leaf.
  35  *
  36  *  The filename will be in a securely created temporary directory.
  37  *
  38  *  @return If successful, filename with specified leaf; otherwise empty
  39  *          string.
  40  */
  41 inline std::string get_tmpfile(const char * leaf) {
  42     std::string f = get_tmpdir();
  43     if (!f.empty())
  44         f += leaf;
  45     return f;
  46 }
  47
  48 /** Return temporary filename with specified leaf.
  49  *
  50  *  The filename will be in a securely created temporary directory.
  51  *
  52  *  @return If successful, filename with specified leaf; otherwise empty
  53  *          string.
  54  */
  55 inline std::string get_tmpfile(const std::string & leaf) {
  56     std::string f = get_tmpdir();
  57     if (!f.empty())
  58         f += leaf;
  59     return f;
  60 }
  61
  62 /** Attempt to remove the directory if we created one.
  63  *
  64  *  If get_tmpdir() hasn't been called or hasn't succeeded, does nothing.
  65  *  If the directory isn't empty or rmdir() otherwise fails, the directory
  66  *  won't get removed.
  67  */
  68 void remove_tmpdir();
  69
  70 #endif // OMEGA_INCLUDED_TMPDIR_H