added wxUmaskChanger class and wxCHANGE_UMASK macro and use them instead of duplicating the same umask-setting code in several places

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29629 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/function.tex

@@ -31,6 +31,7 @@ the corresponding topic.
 \helpref{wxBITMAP}{wxbitmapmacro}\\
 \helpref{wxBeginBusyCursor}{wxbeginbusycursor}\\
 \helpref{wxBell}{wxbell}\\
+\helpref{wxCHANGE\_UMASK}{wxchangeumask}\\
 \helpref{wxCHECK}{wxcheck}\\
 \helpref{wxCHECK2\_MSG}{wxcheck2msg}\\
 \helpref{wxCHECK2}{wxcheck2}\\
@@ -890,7 +891,7 @@ threads.
 
 \wxheading{Include files}
 
-<wx/utils.h>
+<wx/filefn.h>
 
 \wxheading{See also}
 
@@ -1032,6 +1033,18 @@ Converts a Unix to a DOS filename by replacing forward
 slashes with backslashes.
 
 
+\membersection{wxCHANGE\_UMASK}\label{wxchangeumask}
+
+\func{}{wxCHANGE\_UMASK}{\param{int }{mask}}
+
+Under Unix this macro changes the current process umask to the given value,
+unless it is equal to $-1$ in which case nothing is done, and restores it to
+the original value on scope exit. It works by declaring a variable which sets
+umask to \arg{mask} in its constructor and restores it in its destructor.
+
+Under other platforms this macro expands to nothing.
+
+
 \membersection{::wxConcatFiles}\label{wxconcatfiles}
 
 \func{bool}{wxConcatFiles}{\param{const wxString\& }{file1}, \param{const wxString\& }{file2},

include/wx/filefn.h

@@ -549,6 +549,41 @@ WXDLLIMPEXP_BASE int wxParseCommonDialogsFilter(const wxString& wildCard, wxArra
 // classes
 // ----------------------------------------------------------------------------
 
+#ifdef __UNIX__
+
+// set umask to the given value in ctor and reset it to the old one in dtor
+class WXDLLIMPEXP_BASE wxUmaskChanger
+{
+public:
+    // change the umask to the given one if it is not -1: this allows to write
+    // the same code whether you really want to change umask or not, as is in
+    // wxFileConfig::Flush() for example
+    wxUmaskChanger(int umaskNew)
+    {
+        m_umaskOld = umaskNew == -1 ? -1 : umask((mode_t)umaskNew);
+    }
+
+    ~wxUmaskChanger()
+    {
+        if ( m_umaskOld != -1 )
+            umask((mode_t)m_umaskOld);
+    }
+
+private:
+    int m_umaskOld;
+};
+
+// this macro expands to an "anonymous" wxUmaskChanger object under Unix and
+// nothing elsewhere
+#define wxCHANGE_UMASK(m) wxUmaskChanger wxMAKE_UNIQUE_NAME(umaskChanger_)(m)
+
+#else // !__UNIX__
+
+#define wxCHANGE_UMASK(m)
+
+#endif // __UNIX__/!__UNIX__
+
+
 // Path searching
 class WXDLLIMPEXP_BASE wxPathList : public wxStringList
 {

src/common/fileconf.cpp

@@ -39,6 +39,7 @@
 #include  "wx/memtext.h"
 #include  "wx/config.h"
 #include  "wx/fileconf.h"
+#include  "wx/filefn.h"
 
 #if wxUSE_STREAMS
     #include  "wx/stream.h"
@@ -61,12 +62,6 @@
 #include  <stdlib.h>
 #include  <ctype.h>
 
-// headers needed for umask()
-#ifdef __UNIX__
-    #include <sys/types.h>
-    #include <sys/stat.h>
-#endif // __UNIX__
-
 // ----------------------------------------------------------------------------
 // macros
 // ----------------------------------------------------------------------------
@@ -965,14 +960,8 @@ bool wxFileConfig::Flush(bool /* bCurrentOnly */)
   if ( LineListIsEmpty() || !m_pRootGroup->IsDirty() || !m_strLocalFile )
     return true;
 
-#ifdef __UNIX__
   // set the umask if needed
-  mode_t umaskOld = 0;
-  if ( m_umask != -1 )
-  {
-      umaskOld = umask((mode_t)m_umask);
-  }
-#endif // __UNIX__
+  wxCHANGE_UMASK(m_umask);
 
   wxTempFile file(m_strLocalFile);
 
@@ -1016,14 +1005,6 @@ bool wxFileConfig::Flush(bool /* bCurrentOnly */)
     }
 #endif // __WXMAC__
 
-#ifdef __UNIX__
-  // restore the old umask if we changed it
-  if ( m_umask != -1 )
-  {
-      (void)umask(umaskOld);
-  }
-#endif // __UNIX__
-
   return ret;
 }
 

src/common/filefn.cpp

@@ -1021,11 +1021,9 @@ wxCopyFile (const wxString& file1, const wxString& file2, bool overwrite)
         return false;
     }
 
-#ifdef __UNIX__
     // reset the umask as we want to create the file with exactly the same
     // permissions as the original one
-    mode_t oldUmask = umask( 0 );
-#endif // __UNIX__
+    wxCHANGE_UMASK(0);
 
     // create file2 with the same permissions than file1 and open it for
     // writing
@@ -1034,11 +1032,6 @@ wxCopyFile (const wxString& file1, const wxString& file2, bool overwrite)
     if ( !fileOut.Create(file2, overwrite, fbuf.st_mode & 0777) )
         return false;
 
-#ifdef __UNIX__
-    /// restore the old umask
-    umask(oldUmask);
-#endif // __UNIX__
-
     // copy contents of file1 to file2
     char buf[4096];
     size_t count;