fix(sqlite): produce correct error for surrogate characters (RustPython#5962)

Author: ever0de

Lib/test/test_sqlite3/test_userfunctions.py

@@ -354,8 +354,6 @@ def test_return_non_contiguous_blob(self):
             cur = self.con.execute("select return_noncont_blob()")
             cur.fetchone()
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_param_surrogates(self):
         self.assertRaisesRegex(UnicodeEncodeError, "surrogates not allowed",
                                self.con.execute, "select spam(?)",

stdlib/src/sqlite.rs

@@ -2965,12 +2965,10 @@ mod _sqlite {
     }
 
     fn str_to_ptr_len(s: &PyStr, vm: &VirtualMachine) -> PyResult<(*const libc::c_char, i32)> {
-        let s = s
-            .to_str()
-            .ok_or_else(|| vm.new_unicode_encode_error("surrogates not allowed"))?;
-        let len = c_int::try_from(s.len())
+        let s_str = s.try_to_str(vm)?;
+        let len = c_int::try_from(s_str.len())
             .map_err(|_| vm.new_overflow_error("TEXT longer than INT_MAX bytes"))?;
-        let ptr = s.as_ptr().cast();
+        let ptr = s_str.as_ptr().cast();
         Ok((ptr, len))
     }