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use "alloc"
use "die"
use "result"
use "extremum"
use "syswrap"
use "errno"
use "types"

pkg std =
	const slurp : (path : byte[:] -> result(byte[:], errno))
	const fslurp : (path : fd -> result(byte[:], errno))
;;

const Bufstart = 4096

const slurp = {path
	var sl
	match open(path, Ordonly)
	| `Err e:	-> `Err e
	| `Ok fd:
		sl = fslurp(fd)
		close(fd)
		-> sl
	;;
}

const fslurp = {fd
	var len, bufsz
	var buf

	len = 0
	bufsz = Bufstart
	buf = slalloc(bufsz)
	while true
		match read(fd, buf[len:])
		| `Ok 0:
			-> `Ok buf[:len]
		| `Ok n:
			len += n
			if len + 2*n >= bufsz
				bufsz *= 2
				slgrow(&buf, bufsz)
			;;
		| `Err e:
			slfree(buf)
			-> `Err e
		;;
	;;
	die("unreachable")
}