[#bsl-basic_stringbuf-xsputn-03]
= xref:bsl.adoc[bsl]::xref:bsl/basic_stringbuf.adoc[basic_stringbuf]::xsputn
:relfileprefix: ../../
:mrdocs:

Append characters to the output sequence.

== Synopsis

Declared in `<bslstl_stringbuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
std::streamsize
xsputn(
    xref:bsl/basic_stringbuf/char_type.adoc[char_type] const* inputString,
    std::streamsize numCharacters);
----

== Description

Append the specified `numCharacters` from the specified `inputString` to the output sequence starting at the current output position (`pptr`). Update the current output position of this string buffer to refer to the last appended character. Return the number of characters that were appended. The behavior is undefined unless `inputString` refers to a contiguous sequence of at least `numCharacters` characters.


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