Re: Truncate is missing from std.stdio.File, will this do the trick?

[Patrick Schluter via Digitalmars-d]

On Tuesday, 24 July 2018 at 00:15:37 UTC, spikespaz wrote:
I needed a truncate function on the `std.stdio.File` object, so 
I made this function. Does it look okay? Are there any 
cross-platform improvements you can think of that should be 
added?


import std.stdio: File;

void truncate(File file, long offset) {
    version (Windows) {
        import core.sys.windows.windows: SetEndOfFile;

        file.seek(offset);
        SetEndOfFile(file.windowsHandle());
    }

    version (Posix) {
        import core.sys.posix.unistd: ftruncate;

        ftruncate(file.fileno(), offset);
    }
}

Error handling is completely missing. It should throw a 
FileException or something when encountering an error, and there 
can be a lot of errors. Here the list of errno errors that 
ftruncate() can fail with: EFBIG, EINTR, EINVAL, EIO, EISDIR, 
EPERM, EROFS, ETXTBSY and EBADF.
for Windows it will be probably quite similar.