[#BloombergLP-bdls-FdStreamBuf-xsputn]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdls.adoc[bdls]::xref:BloombergLP/bdls/FdStreamBuf.adoc[FdStreamBuf]::xsputn
:relfileprefix: ../../../
:mrdocs:

Write up to the specified `numBytes` characters from the specified `buffer` and return the number of characters successfully written. Note that this method does not necessarily modify the file: this method may simply write the characters to a buffer to be flushed to the file at a later time. Also note that on a Windows text file, a ` ` will be written to the file as `\r ` (counted as a single character).

== Synopsis

Declared in `<bdls_fdstreambuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
std::streamsize
xsputn(
    char const* buffer,
    std::streamsize numBytes) override;
----


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