Introduce to_sqlite_error

643c0f699f
One small step to support creating loadable extension

src/util/mod.rs

@@ -6,4 +6,4 @@ pub(crate) use small_cstr::SmallCString;
 
 // Doesn't use any modern features or vtab stuff, but is only used by them.
 mod sqlite_string;
-pub(crate) use sqlite_string::SqliteMallocString;
+pub(crate) use sqlite_string::{alloc, SqliteMallocString};

src/util/sqlite_string.rs

@@ -7,6 +7,12 @@ use std::marker::PhantomData;
 use std::os::raw::{c_char, c_int};
 use std::ptr::NonNull;
 
+// Space to hold this string must be obtained
+// from an SQLite memory allocation function
+pub(crate) fn alloc(s: &str) -> *mut c_char {
+    SqliteMallocString::from_str(s).into_raw()
+}
+
 /// A string we own that's allocated on the SQLite heap. Automatically calls
 /// `sqlite3_free` when dropped, unless `into_raw` (or `into_inner`) is called
 /// on it. If constructed from a rust string, `sqlite3_malloc` is used.