src/support/tempname.C

   1 /**
   2  * \file tempname.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "support/lyxlib.h"
  14
  15 #include "support/convert.h"
  16 #include "support/filetools.h"
  17 #include "support/package.h"
  18
  19 #include "debug.h"
  20
  21 #include <boost/scoped_array.hpp>
  22
  23 #include <cstdlib>
  24 #ifdef HAVE_UNISTD_H
  25 # include <unistd.h>
  26 #endif
  27
  28 #if !defined(HAVE_MKSTEMP) && defined(HAVE_MKTEMP)
  29 # include <fcntl.h>
  30 # ifdef HAVE_SYS_STAT_H
  31 #  include <sys/stat.h>
  32 # endif
  33 #endif
  34
  35 using boost::scoped_array;
  36
  37 using std::string;
  38 using std::endl;
  39
  40 namespace {
  41
  42 inline
  43 int make_tempfile(char * templ)
  44 {
  45 #if defined(HAVE_MKSTEMP)
  46         return ::mkstemp(templ);
  47 #elif defined(HAVE_MKTEMP)
  48         // This probably just barely works...
  49         ::mktemp(templ);
  50         return ::open(templ, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
  51 #else
  52 #error FIX FIX FIX
  53 #endif
  54 }
  55
  56 } // namespace anon
  57
  58
  59 string const lyx::support::tempName(string const & dir, string const & mask)
  60 {
  61         string const tmpdir(dir.empty() ? package().temp_dir() : dir);
  62         string tmpfl(AddName(tmpdir, mask));
  63         tmpfl += convert<string>(getpid());
  64         tmpfl += "XXXXXX";
  65
  66         // The supposedly safe mkstemp version
  67         scoped_array<char> tmpl(new char[tmpfl.length() + 1]); // + 1 for '\0'
  68         tmpfl.copy(tmpl.get(), string::npos);
  69         tmpl[tmpfl.length()] = '\0'; // terminator
  70
  71         int const tmpf = make_tempfile(tmpl.get());
  72         if (tmpf != -1) {
  73                 string const t(tmpl.get());
  74                 ::close(tmpf);
  75                 lyxerr[Debug::FILES] << "Temporary file `" << t
  76                                      << "' created." << endl;
  77                 return t;
  78         } else {
  79                 lyxerr[Debug::FILES]
  80                         << "LyX Error: Unable to create temporary file."
  81                         << endl;
  82                 return string();
  83         }
  84 }