macros to call read and write functions
int tar_block_read(TAR *t, char *buf);
int tar_block_write(TAR *t, char *buf);
This man page documents version 1.2 of libtar.
The tar_block_read() and tar_block_write() macros call
the read and write functions for the tar archive type associated with the
TAR handle t. This type is set when the TAR handle
is created using tar_open().
These macros return the same values as the corresponding read and write