pBufStart        57254 ext/sqlite3/libsqlite/sqlite3.c   unsigned char * const pBufStart = pBuf;
pBufStart        57396 ext/sqlite3/libsqlite/sqlite3.c          && &pBuf[-4]>=pBufStart                               /* (7) */
pBufStart        57400 ext/sqlite3/libsqlite/sqlite3.c           assert( aWrite>=pBufStart );                         /* hence (7) */