Fossil

/*
** Open a database file.  Return a pointer to the new database
** connection.  An error results in process abort.
*/
LOCAL sqlite3 *db_open(const char *zDbName){
  int rc;
  sqlite3 *db;
  Blob bNameCheck = BLOB_INITIALIZER;

  if( g.fSqlTrace ) fossil_trace("-- sqlite3_open: [%s]\n", zDbName);
  file_canonical_name(zDbName, &bNameCheck, 0)
    /* For purposes of the apndvfs check, g.nameOfExe and zDbName must
    ** both be canonicalized, else chances are very good that they
    ** will not match even if they're the same file. Details:
    ** https://fossil-scm.org/forum/forumpost/16880a28aad1a868 */;
  if( strcmp(zDbName, g.nameOfExe)==0 ){
  if( strcmp(blob_str(&bNameCheck), g.nameOfExe)==0 ){
    extern int sqlite3_appendvfs_init(
      sqlite3 *, char **, const sqlite3_api_routines *
    );
    sqlite3_appendvfs_init(0,0,0);
    g.zVfsName = "apndvfs";
  }
  blob_zero(&bNameCheck);
  rc = sqlite3_open_v2(
       zDbName, &db,
       SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
       g.zVfsName
  );
  if( rc!=SQLITE_OK ){
    db_err("[%s]: %s", zDbName, sqlite3_errmsg(db));