[#ERR_error_string_n]
= ERR_error_string_n
:mrdocs:

Format an OpenSSL error code into a caller‐provided buffer.

== Synopsis

Declared in `<openssl/err.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
ERR_error_string_n(
    unsigned long e,
    char* buf,
    size_t len);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *e*
| Packed error code from ERR_get_error() or similar.
| *buf*
| Destination buffer that receives a NUL‐terminated description.
| *len*
| Capacity of `buf` in bytes.
|===


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