[#BIO_vprintf]
= BIO&lowbar;vprintf
:mrdocs:

printf&hyphen;style formatted write to a BIO using a va&lowbar;list&period;

== Synopsis

Declared in `&lt;openssl&sol;bio&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO&lowbar;vprintf(
    xref:BIO.adoc[BIO]* bio,
    char const* format,
    va&lowbar;list args);
----

== Return Value

Number of bytes written, or a negative value on error&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| Destination BIO&period;
| *format*
| printf&hyphen;style format string&period;
| *args*
| Variable&hyphen;argument list matching `format&period;`
|===


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