pgsql-sdbc: use libpq's custom free()...

... for stuff allocated by libpq

Their documentation says this is important on Microsoft Windows:

It is particularly important that this function, rather than free(),
be used on Microsoft Windows. This is because allocating memory in a
DLL and releasing it in the application works only if
multithreaded/single-threaded, release/debug, and static/dynamic
flags are the same for the DLL and the application.

Also use const unique_ptr since we don't need the value to survive the
scope in any way.

Change-Id: If4637ea0cd1c05125d63e2f3d37dbeaf716973f9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/105967
Tested-by: Lionel Mamane <lionel@mamane.lu>
Reviewed-by: Lionel Mamane <lionel@mamane.lu>

5 files changed, 13 insertions, 4 deletions

diff --git a/connectivity/source/drivers/postgresql/pq_baseresultset.cxx b/connectivity/source/drivers/postgresql/pq_baseresultset.cxx
index 8fc7140e4817..9ff5e01e098a 100644
--- a/connectivity/source/drivers/postgresql/pq_baseresultset.cxx
+++ b/connectivity/source/drivers/postgresql/pq_baseresultset.cxx
@@ -456,7 +456,7 @@ Sequence< sal_Int8 > BaseResultSet::getBytes( sal_Int32 columnIndex )
         char * res = reinterpret_cast<char*>(PQunescapeBytea( reinterpret_cast<unsigned char const *>(val.getStr()), &length));
         ret = Sequence< sal_Int8 > ( reinterpret_cast<sal_Int8*>(res), length );
         if( res )
-            free( res );
+            PQfreemem( res );
     }
     return ret;
 }
diff --git a/connectivity/source/drivers/postgresql/pq_connection.cxx b/connectivity/source/drivers/postgresql/pq_connection.cxx
index 5d97f2b2436d..e4716fe8855d 100644
--- a/connectivity/source/drivers/postgresql/pq_connection.cxx
+++ b/connectivity/source/drivers/postgresql/pq_connection.cxx
@@ -41,6 +41,7 @@
 
 #include "pq_connection.hxx"
 #include "pq_statement.hxx"
+#include "pq_tools.hxx"
 #include "pq_preparedstatement.hxx"
 #include "pq_databasemetadata.hxx"
 #include "pq_xtables.hxx"
@@ -461,7 +462,7 @@ void Connection::initialize( const Sequence< Any >& aArguments )
                 if ( err != nullptr)
                 {
                     errorMessage = OUString( err, strlen(err), ConnectionSettings::encoding );
-                    free(err);
+                    PQfreemem(err);
                 }
                 else
                     errorMessage = "#no error message#";
diff --git a/connectivity/source/drivers/postgresql/pq_preparedstatement.cxx b/connectivity/source/drivers/postgresql/pq_preparedstatement.cxx
index c1d9a4f66731..344c27175850 100644
--- a/connectivity/source/drivers/postgresql/pq_preparedstatement.cxx
+++ b/connectivity/source/drivers/postgresql/pq_preparedstatement.cxx
@@ -481,7 +481,7 @@ void PreparedStatement::setBytes(
     checkClosed();
     checkColumnIndex( parameterIndex );
     size_t len;
-    std::unique_ptr<unsigned char, o3tl::free_delete> escapedString(
+    const std::unique_ptr<unsigned char, deleter_from_fn<PQfreemem>> escapedString(
         PQescapeBytea( reinterpret_cast<unsigned char const *>(x.getConstArray()), x.getLength(), &len));
     if( ! escapedString )
     {
diff --git a/connectivity/source/drivers/postgresql/pq_tools.hxx b/connectivity/source/drivers/postgresql/pq_tools.hxx
index 90490be81eb6..18b105870705 100644
--- a/connectivity/source/drivers/postgresql/pq_tools.hxx
+++ b/connectivity/source/drivers/postgresql/pq_tools.hxx
@@ -51,6 +51,14 @@
 #include <string_view>
 #include <vector>
 
+namespace
+{
+// helper to create one-time deleters
+template <auto fn>
+using deleter_from_fn = std::integral_constant<decltype(fn), fn>;
+
+}
+
 namespace pq_sdbc_driver
 {
 bool isWhitespace( sal_Unicode c );
diff --git a/connectivity/source/drivers/postgresql/pq_updateableresultset.cxx b/connectivity/source/drivers/postgresql/pq_updateableresultset.cxx
index 880adc647c7e..d8780e76c563 100644
--- a/connectivity/source/drivers/postgresql/pq_updateableresultset.cxx
+++ b/connectivity/source/drivers/postgresql/pq_updateableresultset.cxx
@@ -481,7 +481,7 @@ void UpdateableResultSet::updateBytes( sal_Int32 columnIndex, const css::uno::Se
 
     m_updateableField[columnIndex-1].value <<=
         OUString( reinterpret_cast<char*>(escapedString), len, RTL_TEXTENCODING_ASCII_US );
-    free( escapedString );
+    PQfreemem( escapedString );
 }
 
 void UpdateableResultSet::updateDate( sal_Int32 columnIndex, const css::util::Date& x )