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.