[#BUF_MEM_grow_clean]
= BUF_MEM_grow_clean
:mrdocs:

Grow or shrink a BUF_MEM buffer, zeroing any released or newly unused bytes.

== Synopsis

Declared in `<openssl/buffer.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
BUF_MEM_grow_clean(
    xref:BUF_MEM.adoc[BUF_MEM]* str,
    size_t len);
----

== Description

Like BUF_MEM_grow(), but clears freed trailing data and newly allocated unused space.

== Return Value

New length on success, or 0 on allocation failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *str*
| Buffer to resize.
| *len*
| Desired length in bytes.
|===


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