[#BloombergLP-bdls-FdStreamBuf_FileHandler-getOffset]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdls.adoc[bdls]::xref:BloombergLP/bdls/FdStreamBuf_FileHandler.adoc[FdStreamBuf_FileHandler]::getOffset
:relfileprefix: ../../../
:mrdocs:

Return the number of bytes that the data in the range specified by `[first, last)]` will fill when written to the file descriptor. Note that on Unix, or for a binary file on Windows, this value will be `last ‐ first`, but for on Windows in text mode, extra bytes are added when `
` would be written to the file descriptor as `r
`.

== Synopsis

Declared in `<bdls_fdstreambuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::streamoff
getOffset(
    char* first,
    char* last) const;
----


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