patch cat(1) improve -B

["Kamil Rytarowski" <n54%gmx.com@localhost>]

Hello,

cat(1) says:
-B bsize
Read with a buffer size of bsize bytes, instead of the default
buffer size which is the blocksize of the output file.

I'm attaching a small patch:
- documenting -B0 as back-ward compatible behavior,
- handling invalid number parameter.

Original:
$ cat -Baaa
^C
$

New:
$ ./a.out -Baaa
a.out: Invalid buffer size 'aaa': Operation Canceled
$

Regards,

Attachment: patch-cat
Description: Binary data