[#BIO_vprintf]
= BIO_vprintf
:mrdocs:

printf‐style formatted write to a BIO using a va_list.

== Synopsis

Declared in `<openssl/bio.h>`

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

== 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.
| *args*
| Variable‐argument list matching `format.`
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#