buffers: support negative indexing from end.

* buf.c (buf_check_index): Take struct buf p * parameter, to
be able to displace negative values using the buffer length.
(buf_put_bytes, buf_put_i8, puf_put_u8, but_put_char,
buf_put_uchar, buf_get_bytes, buf_get_i8, buf_get_u8,
buf_strm_get_byte_callback): Pass struct buf pointer to
buf_check_index. In buf_put_bytes, we use the returned value
instead of the original pos.
(buf_strm_seek): Don't use buf_check_index for validating the
position, since the negative indexing logic doesn't apply to
stream seek operations.

0 files changed, 0 insertions, 0 deletions