[#BIO_snprintf]
= BIO_snprintf
:mrdocs:

Bounded snprintf‐style formatting into `buf` (NUL‐terminated when `n` > 0).

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_snprintf(
    char* buf,
    size_t n,
    char const* format, ...);
----

== Return Value

Number of characters that would have been written (excluding NUL), or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *buf*
| Destination buffer.
| *n*
| Capacity of `buf` in bytes.
| *format*
| printf‐style format string.
|===


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