[#BIO_printf]
= BIO_printf
:mrdocs:

Formatted print to a BIO, analogous to fprintf().

== Synopsis

Declared in `<openssl/bio.h>`

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

== Return Value

Number of bytes written, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| Destination BIO.
| *format*
| printf‐style format string.
|===


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