H5PL_GET queries the plugin path at a specified index. If
path_buf is non-NULL then it writes up to
buf_size bytes into that buffer and always returns the length of the path name.
path_buf is NULL, this function will simply return the number of characters required to store the path name, ignoring
If an error occurs then the buffer pointed to by
path_buf (NULL or non-NULL) is unchanged and the function returns a negative value. If a zero is returned for the name's length, then there is no path name associated with the index. and the
path_buf buffer will be unchanged.