Return valid pointers from wxDateTime::ParseXXX() with non-wxString strings.

The pointer returned by wxDateTime::ParseXXX() methods could point into a
buffer of a temporary wxString created to wrap a char* or wchar_t* argument so
dereferencing it was illegal.

Fix this by defining separate overloads for char*/wchar_t* arguments returning
pointers into the original string.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70996 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/datetime.h

@@ -1205,6 +1205,44 @@ public:
                                      : wxAnyStrPtr();
     }
 
+    // In addition to wxAnyStrPtr versions above we also must provide the
+    // overloads for C strings as we must return a pointer into the original
+    // string and not inside a temporary wxString which would have been created
+    // if the overloads above were used.
+    //
+    // And then we also have to provide the overloads for wxCStrData, as usual.
+    wxAnyStrPtr ParseRfc822Date(const wxCStrData& date)
+        { return ParseRfc822Date(wxString(date)); }
+    const char* ParseRfc822Date(const char* date);
+    const wchar_t* ParseRfc822Date(const wchar_t* date);
+
+    wxAnyStrPtr ParseFormat(const wxCStrData& date,
+                            const wxString& format = wxDefaultDateTimeFormat,
+                            const wxDateTime& dateDef = wxDefaultDateTime)
+        { return ParseFormat(wxString(date), format, dateDef); }
+    const char* ParseFormat(const char* date,
+                            const wxString& format = wxDefaultDateTimeFormat,
+                            const wxDateTime& dateDef = wxDefaultDateTime);
+    const wchar_t* ParseFormat(const wchar_t* date,
+                               const wxString& format = wxDefaultDateTimeFormat,
+                               const wxDateTime& dateDef = wxDefaultDateTime);
+
+    wxAnyStrPtr ParseDateTime(const wxCStrData& datetime)
+        { return ParseDateTime(wxString(datetime)); }
+    const char* ParseDateTime(const char* datetime);
+    const wchar_t* ParseDateTime(const wchar_t* datetime);
+
+    wxAnyStrPtr ParseDate(const wxCStrData& date)
+        { return ParseDate(wxString(date)); }
+    const char* ParseDate(const char* date);
+    const wchar_t* ParseDate(const wchar_t* date);
+
+    wxAnyStrPtr ParseTime(const wxCStrData& time)
+        { return ParseTime(wxString(time)); }
+    const char* ParseTime(const char* time);
+    const wchar_t* ParseTime(const wchar_t* time);
+
+
     // implementation
     // ------------------------------------------------------------------------
 

src/common/datetimefmt.cpp

@@ -935,6 +935,26 @@ wxDateTime::ParseRfc822Date(const wxString& date, wxString::const_iterator *end)
     return true;
 }
 
+const char* wxDateTime::ParseRfc822Date(const char* date)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseRfc822Date(dateStr, &end) )
+        return NULL;
+
+    return date + dateStr.IterOffsetInMBStr(end);
+}
+
+const wchar_t* wxDateTime::ParseRfc822Date(const wchar_t* date)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseRfc822Date(dateStr, &end) )
+        return NULL;
+
+    return date + (end - dateStr.begin());
+}
+
 bool
 wxDateTime::ParseFormat(const wxString& date,
                         const wxString& format,
@@ -1569,6 +1589,32 @@ wxDateTime::ParseFormat(const wxString& date,
     return true;
 }
 
+const char*
+wxDateTime::ParseFormat(const char* date,
+                        const wxString& format,
+                        const wxDateTime& dateDef)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseFormat(dateStr, format, dateDef, &end) )
+        return NULL;
+
+    return date + dateStr.IterOffsetInMBStr(end);
+}
+
+const wchar_t*
+wxDateTime::ParseFormat(const wchar_t* date,
+                        const wxString& format,
+                        const wxDateTime& dateDef)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseFormat(dateStr, format, dateDef, &end) )
+        return NULL;
+
+    return date + (end - dateStr.begin());
+}
+
 bool
 wxDateTime::ParseDateTime(const wxString& date, wxString::const_iterator *end)
 {
@@ -1622,6 +1668,26 @@ wxDateTime::ParseDateTime(const wxString& date, wxString::const_iterator *end)
     return true;
 }
 
+const char* wxDateTime::ParseDateTime(const char* date)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseDateTime(dateStr, &end) )
+        return NULL;
+
+    return date + dateStr.IterOffsetInMBStr(end);
+}
+
+const wchar_t* wxDateTime::ParseDateTime(const wchar_t* date)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseDateTime(dateStr, &end) )
+        return NULL;
+
+    return date + (end - dateStr.begin());
+}
+
 bool
 wxDateTime::ParseDate(const wxString& date, wxString::const_iterator *end)
 {
@@ -1979,6 +2045,26 @@ wxDateTime::ParseDate(const wxString& date, wxString::const_iterator *end)
     return true;
 }
 
+const char* wxDateTime::ParseDate(const char* date)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseDate(dateStr, &end) )
+        return NULL;
+
+    return date + dateStr.IterOffsetInMBStr(end);
+}
+
+const wchar_t* wxDateTime::ParseDate(const wchar_t* date)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseDate(dateStr, &end) )
+        return NULL;
+
+    return date + (end - dateStr.begin());
+}
+
 bool
 wxDateTime::ParseTime(const wxString& time, wxString::const_iterator *end)
 {
@@ -2034,6 +2120,26 @@ wxDateTime::ParseTime(const wxString& time, wxString::const_iterator *end)
     return false;
 }
 
+const char* wxDateTime::ParseTime(const char* date)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseTime(dateStr, &end) )
+        return NULL;
+
+    return date + dateStr.IterOffsetInMBStr(end);
+}
+
+const wchar_t* wxDateTime::ParseTime(const wchar_t* date)
+{
+    wxString::const_iterator end;
+    wxString dateStr(date);
+    if ( !ParseTime(dateStr, &end) )
+        return NULL;
+
+    return date + (end - dateStr.begin());
+}
+
 // ----------------------------------------------------------------------------
 // Workdays and holidays support
 // ----------------------------------------------------------------------------

tests/datetime/datetimetest.cpp

@@ -1043,6 +1043,10 @@ void DateTimeTestCase::TestDateParse()
             );
         }
     }
+
+    // Check that incomplete parse works correctly.
+    const char* p = dt.ParseFormat("2012-03-23 12:34:56", "%Y-%m-%d");
+    CPPUNIT_ASSERT_EQUAL( " 12:34:56", wxString(p) );
 }
 
 void DateTimeTestCase::TestDateParseISO()