shithub: mc

ref: a7f23ccc3e024fd71451c285d9afec55f220d8df
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)
}