SQLite3 segmentation at prepare statement

[Charles Hixson]

I'm trying to use SQLite3 in D, but am getting a segmentation fault when 
I attempt to replace the exec statement with a prepare statement.  What 
am I doing wrong?

If the prepare statement is commented out, and the exec statement is 
uncommented, the program runs successfully.  (There's no data yet in the 
database file.)

The test program is:

pragma    (lib, "sqlite3");


import    etc.c.sqlite3;
import    std.exception;
import    std.stdio;
import    std.string;

/**    int function(void*, int, char**, char**) callback    */
extern(C)
int    callback    (void* notUsed, int argc, char** argv, char** azColName)
{
     for    (int i = 0;    i < argc;    i++)
     {    printf ("%s = %s\n", azColName[i], argv[i] ? argv[i] : 
"null");    }
     printf    ("\n");
     return    0;
}

void    main()
{    sqlite3*    db;
     int        rc;
     char*        zErrMsg    =    null;
     sqlite3_stmt**    stmt;

     rc    =    sqlite3_open (toStringz("data/sqlitetest.db"), &db);
     if    (SQLITE_OK != rc)
     {    printf ("DB create error: %s\n", sqlite3_errmsg(db) );    }

     string    sql    =
         "create table if not exists wrds (name text primary key, id 
int)\0";
     rc    =    sqlite3_exec(db, sql.ptr, &callback, cast(void*)0, 
&zErrMsg);
     if    (SQLITE_OK != rc)
     {    printf ("DB create table error: %s\n", sqlite3_errmsg(db) );
         printf    ("sql = <<%s>>\n", sql);
     }

     sql    =    "select * from wrds\0";
     rc    =    sqlite3_prepare(db, toStringz(sql), cast(int)sql.length, 
stmt, null);
//    if    (SQLITE_OK != rc)
//    {    printf ("DB prepare statement error: %s\n", sqlite3_errmsg(db) );
//        printf    ("sql = <<%s>>\n", sql);
//    }
//    rc    =    sqlite3_step(*stmt);
//    if    (SQLITE_OK != rc)
//    {    printf ("DB statement step error: %s\n", sqlite3_errmsg(db) );
//        printf    ("sql = <<%s>>\n", sql);
//    }
//
//    rc    =    sqlite3_exec(db, sql.ptr, &callback, cast(void*)0, 
&zErrMsg);
//    if    (SQLITE_OK != rc)
//    {    printf ("DB select error: %s\n", sqlite3_errmsg(db) );
//        printf    ("sql = <<%s>>\n", sql);
//    }
//
     rc    =    sqlite3_close    (db);
     enforce    (rc == SQLITE_OK);
}

-- 
Charles Hixson