shithub: mc

ref: 65a5ecf2c2105ae46c7862aeb87339287bf08b46
dir: /lib/std/mktemp.myr/

use "die.use"
use "alloc.use"
use "env.use"
use "errno.use"
use "fmt.use"
use "option.use"
use "pathjoin.use"
use "memops.use"
use "rand.use"
use "result.use"
use "sldup.use"
use "syswrap.use"
use "types.use"

pkg std =
	const mktemp	: (base : byte[:], opt : fdopt, mode : int64 -> std.result((fd, byte[:]), errno))
	const mktemppath	: (base : byte[:] -> byte[:])
;;

const Retries = 100

const mktemp = {base, opt, mode
	var tmpdir, path, uniq

	match std.getenv("TMPDIR")
	| `std.Some d:	tmpdir = d
	| `std.None:	tmpdir = std.sldup("/tmp")
	;;

	for var i = 0; i < Retries; i++
		uniq = randpath(tmpdir, base)
		path = pathcat(tmpdir, uniq)
		match std.openmode(path, opt | Ocreat, mode)
		| `Fail e:
			if e != Eexist
				std.slfree(uniq)
				std.slfree(tmpdir)
				-> `Fail e
			;;
		| `Ok fd:
			std.slfree(uniq)
			std.slfree(tmpdir)
			-> `Ok (fd, path)
		;;
		std.slfree(uniq)
		std.slfree(path)
	;;
	std.slfree(tmpdir)
	-> `Fail Eexist
}

const mktemppath = {base
	var tmpdir, path

	match std.getenv("TMPDIR")
	| `std.Some d:	tmpdir = d
	| `std.None:	tmpdir = std.sldup("/tmp")
	;;

	path = randpath(tmpdir, base)
	std.slfree(tmpdir)
	-> path
}

const randpath = {dir, base
	var f, p
	var v : uint64

	v = std.randnum()
	f = fmt("{}{}", base, v)
	p = pathcat(dir, f)
	std.slfree(f)
	-> p
}