[#BUF_reverse]
= BUF_reverse
:mrdocs:

Reverse `siz` bytes from `in` into `out` (or in place if `in` is NULL).

== Synopsis

Declared in `<openssl/buffer.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
BUF_reverse(
    unsigned char* out,
    unsigned char const* in,
    size_t siz);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *out*
| Destination buffer; may equal `in` when reversing in place with `in` non‐NULL, or the sole buffer when `in` is NULL.
| *in*
| Source bytes to reverse, or NULL to reverse `out` in place.
| *siz*
| Number of bytes to reverse.
|===


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