shithub: mc

ref: b7730c04c8c83ad6a536a64e549d4d88cc636feb
dir: /lib/std/env+plan9.myr/

use sys

use "alloc"
use "cstrconv"
use "die"
use "extremum"
use "fmt"
use "option"
use "result"
use "slcp"
use "sldup"
use "sleq"
use "slpush"
use "slurp"
use "blat"
use "threadhooks"

pkg std =
	const getenv	: (name : byte[:] -> option(byte[:]))
	const getenvv	: (name : byte[:], default : byte[:] -> byte[:])
	const setenv	: (name : byte[:], val : byte[:] -> void)
;;

var envkey 	: byte[:][:]
var envval	: byte[:][:]

const envfind = {key
	lock(envlck)
	for var i = 0; i < envkey.len; i++
		if std.sleq(envkey[i], key)
			unlock(envlck)
			-> `Some envval[i]
		;;
	;;
	unlock(envlck)
	-> `None
}

const getenv = {name
	var s, ret

	match envfind(name)
	| `Some val:
		ret = `Some val
	| `None:
		s = fmt("/env/{}", name)
		match std.slurp(s)
		| `Err m: 
			ret = `None
		| `Ok data:
			data = cstrconv(data)
			lock(envlck)
			slpush(&envkey, sldup(data))
			slpush(&envval, data)
			unlock(envlck)
			ret = `Some data
		;;
		std.slfree(s)
	;;
	-> ret
}

const getenvv = {name, default
	match getenv(name)
	| `Some val:	-> val
	| `None:	-> default
	;;
}

const setenv = {name, val
	var p

	p = fmt("/env/{}", name)
	blat(p, val, 0o644)
	slfree(p)
}