Add sqlite3 support to Emacs

* configure.ac: Add check for the sqlite library.
* doc/lispref/text.texi (Database): Document it.

* lisp/sqlite.el: New file.

* lisp/term/w32-win.el (dynamic-library-alist): Add a mapping.

* src/Makefile.in (SQLITE3_LIBS): Add the libraries.

* src/alloc.c (union emacs_align_type): Add a Lisp_Sqlite struct.

* src/data.c (Ftype_of): Add sqlite.

* src/emacs.c (main): Load the syms.

* src/lisp.h (DEFINE_GDB_SYMBOL_BEGIN): Add PVEC_SQLITE.
(GCALIGNED_STRUCT): New struct to keep data for sqlite database
objects and statement objects.
(SQLITEP, SQLITE, CHECK_SQLITE, XSQLITE): New macros for accessing
the objects.

* src/pdumper.c (dump_vectorlike): Update hash.
(dump_vectorlike): Don't dump it.

* src/print.c (print_vectorlike): Add a printer for the sqlite
object.

* src/sqlite.c: New file.

* test/src/sqlite-tests.el: Add tests.

1 files changed, 708 insertions, 0 deletions

diff --git a/src/sqlite.c b/src/sqlite.c
new file mode 100644
index 00000000000..b1843bc573a
--- /dev/null
+++ b/src/sqlite.c
@@ -0,0 +1,708 @@
+/*
+Copyright (C) 2021 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+This file is based on the emacs-sqlite3 package written by Syohei
+YOSHIDA <syohex@gmail.com>, which can be found at:
+
+   https://github.com/syohex/emacs-sqlite3
+*/
+
+#include <config.h>
+#include "lisp.h"
+#include "coding.h"
+
+#ifdef HAVE_SQLITE3
+
+#include <sqlite3.h>
+
+#ifdef WINDOWSNT
+
+# include <windows.h>
+# include "w32common.h"
+# include "w32.h"
+
+DEF_DLL_FN (SQLITE_API int, sqlite3_finalize, (sqlite3_stmt*));
+DEF_DLL_FN (SQLITE_API int, sqlite3_close, (sqlite3*));
+DEF_DLL_FN (SQLITE_API int, sqlite3_open_v2,
+            (const char*, sqlite3**, int, const char*));
+DEF_DLL_FN (SQLITE_API int, sqlite3_reset, (sqlite3_stmt*));
+DEF_DLL_FN (SQLITE_API int, sqlite3_bind_text,
+            (sqlite3_stmt*, int, const char*, int, void(*)(void*)));
+DEF_DLL_FN (SQLITE_API int, sqlite3_bind_int64,
+            (sqlite3_stmt*, int, sqlite3_int64));
+DEF_DLL_FN (SQLITE_API int, sqlite3_bind_double, (sqlite3_stmt*, int, double));
+DEF_DLL_FN (SQLITE_API int, sqlite3_bind_null, (sqlite3_stmt*, int));
+DEF_DLL_FN (SQLITE_API int, sqlite3_bind_int, (sqlite3_stmt*, int, int));
+DEF_DLL_FN (SQLITE_API const char*, sqlite3_errmsg, (sqlite3*));
+DEF_DLL_FN (SQLITE_API int, sqlite3_step, (sqlite3_stmt*));
+DEF_DLL_FN (SQLITE_API int, sqlite3_changes, (sqlite3*));
+DEF_DLL_FN (SQLITE_API int, sqlite3_column_count, (sqlite3_stmt*));
+DEF_DLL_FN (SQLITE_API int, sqlite3_column_type, (sqlite3_stmt*, int));
+DEF_DLL_FN (SQLITE_API sqlite3_int64, sqlite3_column_int64,
+            (sqlite3_stmt*, int));
+DEF_DLL_FN (SQLITE_API double, sqlite3_column_double, (sqlite3_stmt*, int));
+DEF_DLL_FN (SQLITE_API const void*, sqlite3_column_blob,
+            (sqlite3_stmt*, int));
+DEF_DLL_FN (SQLITE_API int, sqlite3_column_bytes, (sqlite3_stmt*, int));
+DEF_DLL_FN (SQLITE_API const unsigned char*, sqlite3_column_text,
+            (sqlite3_stmt*, int));
+DEF_DLL_FN (SQLITE_API const char*, sqlite3_column_name, (sqlite3_stmt*, int));
+DEF_DLL_FN (SQLITE_API int, sqlite3_exec,
+            (sqlite3*, const char*, int (*callback)(void*,int,char**,char**),
+             void*, char**));
+DEF_DLL_FN (SQLITE_API int, sqlite3_load_extension,
+            (sqlite3*, const char*, const char*, char**));
+DEF_DLL_FN (SQLITE_API int, sqlite3_prepare_v2,
+            (sqlite3*, const char*, int, sqlite3_stmt**, const char**));
+
+# undef sqlite3_finalize
+# undef sqlite3_close
+# undef sqlite3_open_v2
+# undef sqlite3_reset
+# undef sqlite3_bind_text
+# undef sqlite3_bind_int64
+# undef sqlite3_bind_double
+# undef sqlite3_bind_null
+# undef sqlite3_bind_int
+# undef sqlite3_errmsg
+# undef sqlite3_step
+# undef sqlite3_changes
+# undef sqlite3_column_count
+# undef sqlite3_column_type
+# undef sqlite3_column_int64
+# undef sqlite3_column_double
+# undef sqlite3_column_blob
+# undef sqlite3_column_bytes
+# undef sqlite3_column_text
+# undef sqlite3_column_name
+# undef sqlite3_exec
+# undef sqlite3_load_extension
+# undef sqlite3_prepare_v2
+
+# define sqlite3_finalize fn_sqlite3_finalize
+# define sqlite3_close fn_sqlite3_close
+# define sqlite3_open_v2 fn_sqlite3_open_v2
+# define sqlite3_reset fn_sqlite3_reset
+# define sqlite3_bind_text fn_sqlite3_bind_text
+# define sqlite3_bind_int64 fn_sqlite3_bind_int64
+# define sqlite3_bind_double fn_sqlite3_bind_double
+# define sqlite3_bind_null fn_sqlite3_bind_null
+# define sqlite3_bind_int fn_sqlite3_bind_int
+# define sqlite3_errmsg fn_sqlite3_errmsg
+# define sqlite3_step fn_sqlite3_step
+# define sqlite3_changes fn_sqlite3_changes
+# define sqlite3_column_count fn_sqlite3_column_count
+# define sqlite3_column_type fn_sqlite3_column_type
+# define sqlite3_column_int64 fn_sqlite3_column_int64
+# define sqlite3_column_double fn_sqlite3_column_double
+# define sqlite3_column_blob fn_sqlite3_column_blob
+# define sqlite3_column_bytes fn_sqlite3_column_bytes
+# define sqlite3_column_text fn_sqlite3_column_text
+# define sqlite3_column_name fn_sqlite3_column_name
+# define sqlite3_exec fn_sqlite3_exec
+# define sqlite3_load_extension fn_sqlite3_load_extension
+# define sqlite3_prepare_v2 fn_sqlite3_prepare_v2
+
+static bool
+load_dll_functions (HMODULE library)
+{
+  LOAD_DLL_FN (library, sqlite3_finalize);
+  LOAD_DLL_FN (library, sqlite3_close);
+  LOAD_DLL_FN (library, sqlite3_open_v2);
+  LOAD_DLL_FN (library, sqlite3_reset);
+  LOAD_DLL_FN (library, sqlite3_bind_text);
+  LOAD_DLL_FN (library, sqlite3_bind_int64);
+  LOAD_DLL_FN (library, sqlite3_bind_double);
+  LOAD_DLL_FN (library, sqlite3_bind_null);
+  LOAD_DLL_FN (library, sqlite3_bind_int);
+  LOAD_DLL_FN (library, sqlite3_errmsg);
+  LOAD_DLL_FN (library, sqlite3_step);
+  LOAD_DLL_FN (library, sqlite3_changes);
+  LOAD_DLL_FN (library, sqlite3_column_count);
+  LOAD_DLL_FN (library, sqlite3_column_type);
+  LOAD_DLL_FN (library, sqlite3_column_int64);
+  LOAD_DLL_FN (library, sqlite3_column_double);
+  LOAD_DLL_FN (library, sqlite3_column_blob);
+  LOAD_DLL_FN (library, sqlite3_column_bytes);
+  LOAD_DLL_FN (library, sqlite3_column_text);
+  LOAD_DLL_FN (library, sqlite3_column_name);
+  LOAD_DLL_FN (library, sqlite3_exec);
+  LOAD_DLL_FN (library, sqlite3_load_extension);
+  LOAD_DLL_FN (library, sqlite3_prepare_v2);
+  return true;
+}
+
+static bool
+sqlite_loaded_p (void)
+{
+  Lisp_Object found = Fassq (Qsqlite3, Vlibrary_cache);
+
+  return CONSP (found) && EQ (XCDR (found), Qt);
+}
+#endif /* WINDOWSNT */
+
+static bool
+init_sqlite_functions (void)
+{
+#ifdef WINDOWSNT
+  if (sqlite_loaded_p ())
+    return true;
+  else
+    {
+      HMODULE library;
+
+      if (!(library = w32_delayed_load (Qsqlite3)))
+        {
+          message1 ("sqlite3 library not found");
+          return false;
+        }
+
+      if (! load_dll_functions (library))
+        goto bad_library;
+
+      Vlibrary_cache = Fcons (Fcons (Qsqlite3, Qt), Vlibrary_cache);
+      return true;
+    }
+
+ bad_library:
+  Vlibrary_cache = Fcons (Fcons (Qsqlite3, Qnil), Vlibrary_cache);
+
+  return false;
+#else  /* !WINDOWSNT */
+  return true;
+#endif  /* !WINDOWSNT */
+}
+
+
+static void
+sqlite_free (void *arg)
+{
+  struct Lisp_Sqlite *ptr = (struct Lisp_Sqlite *)arg;
+  if (ptr->is_statement)
+    sqlite3_finalize (ptr->stmt);
+  else if (ptr->db)
+    sqlite3_close (ptr->db);
+  xfree (ptr->name);
+  xfree (ptr);
+}
+
+static Lisp_Object
+encode_string (Lisp_Object string)
+{
+  if (STRING_MULTIBYTE (string))
+    return encode_string_utf_8 (string, Qnil, 0, Qt, Qt);
+  else
+    return string;
+}
+
+static Lisp_Object
+make_sqlite (bool is_statement, void *db, void *stmt, char *name)
+{
+  struct Lisp_Sqlite *ptr
+    = ALLOCATE_PLAIN_PSEUDOVECTOR (struct Lisp_Sqlite, PVEC_SQLITE);
+  ptr->is_statement = is_statement;
+  ptr->finalizer = sqlite_free;
+  ptr->db = db;
+  ptr->name = name;
+  ptr->stmt = stmt;
+  ptr->eof = false;
+  return make_lisp_ptr (ptr, Lisp_Vectorlike);
+}
+
+static void
+check_sqlite (Lisp_Object db, bool is_statement)
+{
+  init_sqlite_functions ();
+  CHECK_SQLITE (db);
+  if (is_statement && !XSQLITE (db)->is_statement)
+    xsignal1 (Qerror, build_string ("Invalid set object"));
+  else if (!is_statement && XSQLITE (db)->is_statement)
+    xsignal1 (Qerror, build_string ("Invalid database object"));
+  if (!is_statement && !XSQLITE (db)->db)
+    xsignal1 (Qerror, build_string ("Database closed"));
+  else if (is_statement && !XSQLITE (db)->db)
+    xsignal1 (Qerror, build_string ("Statement closed"));
+}
+
+static int db_count = 0;
+
+DEFUN ("sqlite-open", Fsqlite_open, Ssqlite_open, 0, 1, 0,
+       doc: /* Open FILE as an sqlite database.
+If FILE is nil, an in-memory database will be opened instead.  */)
+  (Lisp_Object file)
+{
+  char *name;
+  init_sqlite_functions ();
+
+  if (!NILP (file))
+    {
+      CHECK_STRING (file);
+      name = xstrdup (SSDATA (Fexpand_file_name (file, Qnil)));
+    }
+  else
+    /* In-memory database.  These have to have different names to
+       refer to different databases.  */
+    name = xstrdup (SSDATA (CALLN (Fformat, build_string (":memory:%d"),
+                                   make_int (++db_count))));
+
+  sqlite3 *sdb;
+  int ret = sqlite3_open_v2 (name,
+                             &sdb,
+                             SQLITE_OPEN_FULLMUTEX
+                             | SQLITE_OPEN_READWRITE
+                             | SQLITE_OPEN_CREATE
+                             | (NILP (file) ? SQLITE_OPEN_MEMORY : 0)
+#ifdef SQLITE_OPEN_URI
+                             | SQLITE_OPEN_URI
+#endif
+                             | 0, NULL);
+
+  if (ret != SQLITE_OK)
+    return Qnil;
+
+  return make_sqlite (false, sdb, NULL, name);
+}
+
+DEFUN ("sqlite-close", Fsqlite_close, Ssqlite_close, 1, 1, 0,
+       doc: /* Close the database DB.  */)
+  (Lisp_Object db)
+{
+  check_sqlite (db, false);
+  sqlite3_close (XSQLITE (db)->db);
+  XSQLITE (db)->db = NULL;
+  return Qnil;
+}
+
+/* Bind values in a statement like
+   "insert into foo values (?, ?, ?)".  */
+static const char *
+bind_values (sqlite3 *db, sqlite3_stmt *stmt, Lisp_Object values)
+{
+  sqlite3_reset (stmt);
+  int len;
+  if (VECTORP (values))
+    len = ASIZE (values);
+  else
+    len = list_length (values);
+
+  for (int i = 0; i < len; ++i)
+    {
+      int ret = SQLITE_MISMATCH;
+      Lisp_Object value;
+      if (VECTORP (values))
+        value = AREF (values, i);
+      else
+        {
+          value = XCAR (values);
+          values = XCDR (values);
+        }
+      Lisp_Object type = Ftype_of (value);
+
+      if (EQ (type, Qstring))
+        {
+          Lisp_Object encoded = encode_string (value);
+          ret = sqlite3_bind_text (stmt, i + 1,
+                                   SSDATA (encoded), SBYTES (encoded),
+                                   NULL);
+        }
+      else if (EQ (type, Qinteger))
+        {
+          if (BIGNUMP (value))
+            ret = sqlite3_bind_int64 (stmt, i + 1, bignum_to_intmax (value));
+          else
+            ret = sqlite3_bind_int64 (stmt, i + 1, XFIXNUM (value));
+        }
+      else if (EQ (type, Qfloat))
+        ret = sqlite3_bind_double (stmt, i + 1, XFLOAT_DATA (value));
+      else if (NILP (value))
+        ret = sqlite3_bind_null (stmt, i + 1);
+      else if (EQ (value, Qt))
+        ret = sqlite3_bind_int (stmt, i + 1, 1);
+      else if (EQ (value, Qfalse))
+        ret = sqlite3_bind_int (stmt, i + 1, 0);
+      else
+        return "invalid argument";
+
+      if (ret != SQLITE_OK)
+        return sqlite3_errmsg (db);
+    }
+
+  return NULL;
+}
+
+DEFUN ("sqlite-execute", Fsqlite_execute, Ssqlite_execute, 2, 3, 0,
+       doc: /* Execute a non-select SQL statement.
+If VALUES is non-nil, it should be a list of values to bind when
+executing a statement like
+
+   insert into foo values (?, ?, ...)
+
+The number of affected rows is returned.  */)
+  (Lisp_Object db, Lisp_Object query, Lisp_Object values)
+{
+  check_sqlite (db, false);
+  CHECK_STRING (query);
+  if (!(NILP (values) || CONSP (values) || VECTORP (values)))
+    xsignal1 (Qerror, build_string ("VALUES must be a list or a vector"));
+
+  sqlite3 *sdb = XSQLITE (db)->db;
+  Lisp_Object retval = Qnil;
+  const char *errmsg = NULL;
+  Lisp_Object encoded = encode_string (query);
+  sqlite3_stmt *stmt = NULL;
+
+  /* We only execute the first statement -- if there's several
+     (separated by a semicolon), the subsequent statements won't be
+     done.  */
+  int ret = sqlite3_prepare_v2 (sdb, SSDATA (encoded), -1, &stmt, NULL);
+  if (ret != SQLITE_OK)
+    {
+      if (stmt != NULL)
+        {
+          sqlite3_finalize (stmt);
+          sqlite3_reset (stmt);
+        }
+
+      errmsg = sqlite3_errmsg (sdb);
+      goto exit;
+    }
+
+  /* Bind ? values.  */
+  if (!NILP (values)) {
+    const char *err = bind_values (sdb, stmt, values);
+    if (err != NULL)
+      {
+        errmsg = err;
+        goto exit;
+      }
+  }
+
+  ret = sqlite3_step (stmt);
+  sqlite3_finalize (stmt);
+  if (ret != SQLITE_OK && ret != SQLITE_DONE)
+    {
+      errmsg = sqlite3_errmsg (sdb);
+      goto exit;
+    }
+
+  retval = make_fixnum (sqlite3_changes (sdb));
+
+ exit:
+  if (errmsg != NULL)
+    xsignal1 (Qerror, build_string (errmsg));
+
+  return retval;
+}
+
+static Lisp_Object
+row_to_value (sqlite3_stmt *stmt)
+{
+  int len = sqlite3_column_count (stmt);
+  Lisp_Object values = Qnil;
+
+  for (int i = 0; i < len; ++i)
+    {
+      Lisp_Object v = Qnil;
+
+      switch (sqlite3_column_type (stmt, i))
+        {
+        case SQLITE_INTEGER:
+          v = make_int (sqlite3_column_int64 (stmt, i));
+          break;
+
+        case SQLITE_FLOAT:
+          v = make_float (sqlite3_column_double (stmt, i));
+          break;
+
+        case SQLITE_BLOB:
+          v =
+            code_convert_string_norecord
+            (make_string (sqlite3_column_blob (stmt, i),
+                          sqlite3_column_bytes (stmt, i)),
+             Qutf_8, false);
+          break;
+
+        case SQLITE_NULL:
+          v = Qnil;
+          break;
+
+        case SQLITE_TEXT:
+          v =
+            code_convert_string_norecord
+            (make_string ((const char*)sqlite3_column_text (stmt, i),
+                          sqlite3_column_bytes (stmt, i)),
+             Qutf_8, false);
+          break;
+        }
+
+      values = Fcons (v, values);
+    }
+
+  return Fnreverse (values);
+}
+
+static Lisp_Object
+column_names (sqlite3_stmt *stmt)
+{
+  Lisp_Object columns = Qnil;
+  int count = sqlite3_column_count (stmt);
+  for (int i = 0; i < count; ++i)
+    columns = Fcons (build_string (sqlite3_column_name (stmt, i)), columns);
+
+  return Fnreverse (columns);
+}
+
+DEFUN ("sqlite-select", Fsqlite_select, Ssqlite_select, 2, 4, 0,
+       doc: /* Select data from the database DB that matches QUERY.
+If VALUES is non-nil, they are values that will be interpolated into a
+parametrised statement.
+
+By default, the return value is a list where the first element is a
+list of column names, and the rest of the elements are the matching data.
+
+RETURN-TYPE can be either nil (which means that the matching data
+should be returned as a list of rows), or `full' (the same, but the
+first element in the return list will be the column names), or `set',
+which means that we return a set object that can be queried with
+`sqlite-next' and other functions to get the data.  */)
+  (Lisp_Object db, Lisp_Object query, Lisp_Object values,
+   Lisp_Object return_type)
+{
+  check_sqlite (db, false);
+  CHECK_STRING (query);
+
+  if (!(NILP (values) || CONSP (values) || VECTORP (values)))
+    xsignal1 (Qerror, build_string ("VALUES must be a list or a vector"));
+
+  sqlite3 *sdb = XSQLITE (db)->db;
+  Lisp_Object retval = Qnil;
+  const char *errmsg = NULL;
+  Lisp_Object encoded = encode_string (query);
+
+  sqlite3_stmt *stmt = NULL;
+  int ret = sqlite3_prepare_v2 (sdb, SSDATA (encoded), SBYTES (encoded),
+                                &stmt, NULL);
+  if (ret != SQLITE_OK)
+    {
+      if (stmt)
+        sqlite3_finalize (stmt);
+
+      goto exit;
+    }
+
+  /* Query with parameters.  */
+  if (!NILP (values))
+    {
+      const char *err = bind_values (sdb, stmt, values);
+      if (err != NULL)
+        {
+          sqlite3_finalize (stmt);
+          errmsg = err;
+          goto exit;
+        }
+    }
+
+  /* Return a handle to get the data.  */
+  if (EQ (return_type, Qset))
+    {
+      retval = make_sqlite (true, db, stmt, XSQLITE (db)->name);
+      goto exit;
+    }
+
+  /* Return the data directly.  */
+  Lisp_Object data = Qnil;
+  while ((ret = sqlite3_step (stmt)) == SQLITE_ROW)
+    data = Fcons (row_to_value (stmt), data);
+
+  if (EQ (return_type, Qfull))
+    retval = Fcons (column_names (stmt), Fnreverse (data));
+  else
+    retval = Fnreverse (data);
+  sqlite3_finalize (stmt);
+
+ exit:
+  if (errmsg != NULL)
+    xsignal1 (Qerror, build_string (errmsg));
+
+  return retval;
+}
+
+static Lisp_Object
+sqlite_exec (sqlite3 *sdb, const char *query)
+{
+  int ret = sqlite3_exec (sdb, query, NULL, NULL, NULL);
+  if (ret != SQLITE_OK)
+    return Qnil;
+
+  return Qt;
+}
+
+DEFUN ("sqlite-transaction", Fsqlite_transaction, Ssqlite_transaction, 1, 1, 0,
+       doc: /* Start a transaction in DB.  */)
+  (Lisp_Object db)
+{
+  check_sqlite (db, false);
+  return sqlite_exec (XSQLITE (db)->db, "begin");
+}
+
+DEFUN ("sqlite-commit", Fsqlite_commit, Ssqlite_commit, 1, 1, 0,
+       doc: /* Commit a transaction in DB.  */)
+  (Lisp_Object db)
+{
+  check_sqlite (db, false);
+  return sqlite_exec (XSQLITE (db)->db, "commit");
+}
+
+DEFUN ("sqlite-rollback", Fsqlite_rollback, Ssqlite_rollback, 1, 1, 0,
+       doc: /* Roll back a transaction in DB.  */)
+  (Lisp_Object db)
+{
+  check_sqlite (db, false);
+  return sqlite_exec (XSQLITE (db)->db, "rollback");
+}
+
+DEFUN ("sqlite-load-extension", Fsqlite_load_extension,
+       Ssqlite_load_extension, 2, 2, 0,
+       doc: /* Load a an SQlite module into DB.
+MODULE should be the file name of an SQlite module .so file.  */)
+  (Lisp_Object db, Lisp_Object module)
+{
+  check_sqlite (db, false);
+  CHECK_STRING (module);
+
+  sqlite3 *sdb = XSQLITE (db)->db;
+  int result = sqlite3_load_extension (sdb,
+                                       SSDATA (Fexpand_file_name (module, Qnil)),
+                                       NULL, NULL);
+  if (result ==  SQLITE_OK)
+    return Qt;
+  return Qnil;
+}
+
+DEFUN ("sqlite-next", Fsqlite_next, Ssqlite_next, 1, 1, 0,
+       doc: /* Return the next result set from SET.  */)
+  (Lisp_Object set)
+{
+  check_sqlite (set, true);
+
+  int ret = sqlite3_step (XSQLITE (set)->stmt);
+  if (ret != SQLITE_ROW && ret != SQLITE_OK && ret != SQLITE_DONE)
+    xsignal1 (Qerror, build_string (sqlite3_errmsg (XSQLITE (set)->db)));
+
+  if (ret == SQLITE_DONE)
+    {
+      XSQLITE (set)->eof = true;
+      return Qnil;
+    }
+
+  return row_to_value (XSQLITE (set)->stmt);
+}
+
+DEFUN ("sqlite-columns", Fsqlite_columns, Ssqlite_columns, 1, 1, 0,
+       doc: /* Return the column names of SET.  */)
+  (Lisp_Object set)
+{
+  check_sqlite (set, true);
+  return column_names (XSQLITE (set)->stmt);
+}
+
+DEFUN ("sqlite-more-p", Fsqlite_more_p, Ssqlite_more_p, 1, 1, 0,
+       doc: /* Say whether there's any further results in SET.  */)
+  (Lisp_Object set)
+{
+  check_sqlite (set, true);
+
+  if (XSQLITE (set)->eof)
+    return Qnil;
+  else
+    return Qt;
+}
+
+DEFUN ("sqlite-finalize", Fsqlite_finalize, Ssqlite_finalize, 1, 1, 0,
+       doc: /* Mark this SET as being finished.
+This will free the resources held by SET.  */)
+  (Lisp_Object set)
+{
+  check_sqlite (set, true);
+  sqlite3_finalize (XSQLITE (set)->stmt);
+  return Qt;
+}
+
+#endif /* HAVE_SQLITE3 */
+
+DEFUN ("sqlitep", Fsqlitep, Ssqlitep, 1, 1, 0,
+       doc: /* Say whether OBJECT is an SQlite object.  */)
+  (Lisp_Object object)
+{
+#ifdef HAVE_SQLITE3
+  return SQLITE (object)? Qt: Qnil;
+#else
+  return Qnil;
+#endif
+}
+
+DEFUN ("sqlite-available-p", Fsqlite_available_p, Ssqlite_available_p, 0, 0, 0,
+       doc: /* Return t if sqlite3 support is available in this instance of Emacs.*/)
+  (void)
+{
+#ifdef HAVE_SQLITE3
+# ifdef WINDOWSNT
+  Lisp_Object found = Fassq (Qsqlite3, Vlibrary_cache);
+  if (CONSP (found))
+    return XCDR (found);
+  else
+    {
+      Lisp_Object status;
+      status = init_sqlite_functions () ? Qt : Qnil;
+      Vlibrary_cache = Fcons (Fcons (Qsqlite3, status), Vlibrary_cache);
+      return status;
+    }
+# else
+  return Qt;
+#endif
+#else
+  return Qnil;
+#endif
+}
+
+void
+syms_of_sqlite (void)
+{
+#ifdef HAVE_SQLITE3
+  defsubr (&Ssqlite_open);
+  defsubr (&Ssqlite_close);
+  defsubr (&Ssqlite_execute);
+  defsubr (&Ssqlite_select);
+  defsubr (&Ssqlite_transaction);
+  defsubr (&Ssqlite_commit);
+  defsubr (&Ssqlite_rollback);
+  defsubr (&Ssqlite_load_extension);
+  defsubr (&Ssqlite_next);
+  defsubr (&Ssqlite_columns);
+  defsubr (&Ssqlite_more_p);
+  defsubr (&Ssqlite_finalize);
+  DEFSYM (Qset, "set");
+  DEFSYM (Qfull, "full");
+#endif
+  defsubr (&Ssqlitep);
+  DEFSYM (Qsqlitep, "sqlitep");
+  defsubr (&Ssqlite_available_p);
+  DEFSYM (Qfalse, "false");
+  DEFSYM (Qsqlite, "sqlite");
+  DEFSYM (Qsqlite3, "sqlite3");
+}