[#BIO_printf]
= BIO&lowbar;printf
:mrdocs:

Formatted print to a BIO, analogous to fprintf()&period;

== Synopsis

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

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

== 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;
|===


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