Function svn_hash_read_incremental 

pub unsafe extern "C" fn svn_hash_read_incremental(
    hash: *mut apr_hash_t,
    stream: *mut svn_stream_t,
    terminator: *const c_char,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Similar to svn_hash_read2(), but allows @a stream to contain deletion lines which remove entries from @a hash as well as adding to it.

@since New in 1.1.