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use "errno"
use "result"
use "option"
use "syswrap"
use "types"

pkg std =
	const writeall : (fd : fd, src : byte[:] -> (size, option(errno)))
;;

const writeall = {fd, src
	var sz

	sz = src.len
	while src.len != 0
		match std.write(fd, src)
		| `Ok n:
			src = src[n:]
		| `Err e:
			-> (sz - src.len, `Some e)
		;;
	;;
	-> (sz, `None)
}