gpg: Avoid name spaces clash with future sqlite versions.

* g10/sqlite.c: Rename to gpgsql.c.  Change function prefixes to
gpgsql_.
* g10/sqlite.h: Rename to gpgsql.h.
* g10/tofu.c: Adjust for changes.
--

We used for our own extensions symbols with an sqlite_ names prefix.
This may in theory lead to duplicated symbols but more important, it
is harder to understand what is from gpg and what is from libsqlite.

Signed-off-by: Werner Koch <wk@gnupg.org>

g10/gpgsql.h

@@ -0,0 +1,61 @@
+/* gpgsql.h - SQLite helper functions.
+ * Copyright (C) 2015 g10 Code GmbH
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG 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.
+ *
+ * GnuPG 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 this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GNUPG_GPGSQL_H
+#define GNUPG_GPGSQL_H
+
+#include <sqlite3.h>
+
+enum gpgsql_arg_type
+  {
+    SQLITE_ARG_END = 0xdead001,
+    SQLITE_ARG_INT,
+    SQLITE_ARG_LONG_LONG,
+    SQLITE_ARG_STRING,
+    /* This takes two arguments: the blob as a void * and the length
+       of the blob as a long long.  */
+    SQLITE_ARG_BLOB
+  };
+
+int gpgsql_exec_printf (sqlite3 *db,
+                     int (*callback)(void*,int,char**,char**), void *cookie,
+                     char **errmsg,
+                     const char *sql, ...);
+
+typedef int (*gpgsql_stepx_callback) (void *cookie,
+                                      /* number of columns.  */
+                                      int cols,
+                                      /* columns as text.  */
+                                      char **values,
+                                      /* column names.  */
+                                      char **names,
+                                      /* The prepared statement so
+                                       * that it is possible to use
+                                       * something like
+                                       * sqlite3_column_blob().  */
+                                      sqlite3_stmt *statement);
+
+int gpgsql_stepx (sqlite3 *db,
+                  sqlite3_stmt **stmtp,
+                  gpgsql_stepx_callback callback,
+                  void *cookie,
+                  char **errmsg,
+                  const char *sql, ...);
+
+#endif /*GNUPG_GPGSQL_H*/