[Bug tapsets/19489] printing array from memory

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19489

Frank Ch. Eigler <fche at redhat dot com> changed:

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                 CC|                            |fche at redhat dot com

--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> ---
Thanks for your report.

The core of the problem appears to be our use of user_string_n2_quoted in the
syscall.write alias (see .../tapset/linux/syscalls2.stp), specifically the
interpretation of the "n".  The function interprets it as a maximum, not an
exact buffer length (see [man function::user_string_n2_quoted]'s mention of C
strings).

We could revise the behaviour of that function to treat its input as a buffer
of definite size, if most or all other uses of that function would benefit.

In the interim, you can use

    printf("%.*M", $count, $buf)

(note the    ^    dot!)

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