Sets read-only attribute on a file

these constants come from inspecting some Microsoft sample code

Converts root path of the argument to canonical form, i.e. "C:\" instead of "c:\".

! * Closes a file descriptor and returns the result, similar to close(2). Unlike close(2), guarantees that the file descriptor is closed even if EINT

Converts NT path to a Win32 path

copy_file implementation that uses read/write loop (fallback using a stack buffer)

Flushes buffered data written to the file to permanent storage

compile-only two argument "do-the-right-thing" tests verifies that all overload combinations compile without error

Finds position and size of the first element of the path

Returns optimal block size from \c statx structure

Obtains maximum length of a path, not including the terminating zero

Initializes copy_file_data implementation pointer

Initializes directory iterator implementation

Initializes fill_random implementation pointer

Initializes statx implementation pointer

Initializes WinAPI function pointers

C++14 provides a mismatch algorithm with four iterator arguments(), but earlier standard libraries didn't, so provide this needed functionality.

Opens a directory file and returns a file descriptor. Returns a negative value in case of error.

Returns maximum length of a path, not including the terminating zero

Hints the filesystem to opportunistically preallocate storage for a file