[#AllocateFileRange]
= AllocateFileRange
:mrdocs:

Pre‐allocate a range of a file so later writes into it do not fragment or fail.

== Synopsis

Declared in `<util/fs_helpers.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
AllocateFileRange(
    FILE* file,
    unsigned int offset,
    unsigned int length);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *file* [in]
| The open file to extend.
| *offset* [in]
| The starting byte offset of the range to allocate.
| *length* [in]
| The number of bytes to allocate from the offset.
|===


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