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 # ifdef HAVE_IO_H
  34 #  include <io.h>
  35 # endif
  36 # ifdef HAVE_PROCESS_H
  37 #  include <process.h>
  38 # endif
  39 #endif
  40
  41 using boost::scoped_array;
  42
  43 using std::string;
  44 using std::endl;
  45
  46 namespace {
  47
  48 inline
  49 int make_tempfile(char * templ)
  50 {
  51 #if defined(HAVE_MKSTEMP)
  52         return ::mkstemp(templ);
  53 #elif defined(HAVE_MKTEMP)
  54         // This probably just barely works...
  55         ::mktemp(templ);
  56 # if defined (HAVE_OPEN)
  57         return ::open(templ, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
  58 # elif defined (HAVE__OPEN)
  59         return ::_open(templ,
  60                        _O_RDWR | _O_CREAT | _O_EXCL,
  61                        _S_IREAD | _S_IWRITE);
  62 # else
  63 #  error No open() function.
  64 # endif
  65 #else
  66 #error FIX FIX FIX
  67 #endif
  68 }
  69
  70 } // namespace anon
  71
  72
  73 string const lyx::support::tempName(string const & dir, string const & mask)
  74 {
  75         string const tmpdir(dir.empty() ? package().temp_dir() : dir);
  76         string tmpfl(addName(tmpdir, mask));
  77 #if defined (HAVE_GETPID)
  78         tmpfl += convert<string>(getpid());
  79 #elif defined (HAVE__GETPID)
  80         tmpfl += convert<string>(_getpid());
  81 #else
  82 # error No getpid() function
  83 #endif
  84         tmpfl += "XXXXXX";
  85
  86         // The supposedly safe mkstemp version
  87         scoped_array<char> tmpl(new char[tmpfl.length() + 1]); // + 1 for '\0'
  88         tmpfl.copy(tmpl.get(), string::npos);
  89         tmpl[tmpfl.length()] = '\0'; // terminator
  90
  91         int const tmpf = make_tempfile(tmpl.get());
  92         if (tmpf != -1) {
  93                 string const t(tmpl.get());
  94 #if defined (HAVE_CLOSE)
  95                 ::close(tmpf);
  96 #elif defined (HAVE__CLOSE)
  97                 ::_close(tmpf);
  98 #else
  99 # error No close() function.
 100 #endif
 101                 lyxerr[Debug::FILES] << "Temporary file `" << t
 102                                      << "' created." << endl;
 103                 return t;
 104         } else {
 105                 lyxerr[Debug::FILES]
 106                         << "LyX Error: Unable to create temporary file."
 107                         << endl;
 108                 return string();
 109         }
 110 }