[#CRYPTO_strndup]
= CRYPTO_strndup
:mrdocs:

Duplicate at most `s` characters of `str` using the OpenSSL allocator.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
char*
CRYPTO_strndup(
    char const* str,
    size_t s,
    char const* file,
    int line);
----

== Return Value

Newly allocated NUL‐terminated copy, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *str*
| Source bytes (NUL‐terminated or truncated at `s).`
| *s*
| Maximum number of characters to copy (excluding the added NUL).
| *file*
| Source file name recorded with the allocation (usually *FILE*).
| *line*
| Source line recorded with the allocation (usually *LINE*).
|===


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