Function strSub

stringlib.go:414–425

(L *LState)

}

func strSub(L *LState) int {
	str := L.CheckString(1)
	start := luaIndex2StringIndex(str, L.CheckInt(2), true)
	end := luaIndex2StringIndex(str, L.OptInt(3, -1), false)
	l := len(str)
	if start >= l || end < start {
		L.Push(emptyLString)
	} else {
		L.Push(LString(str[start:end]))
	}
	return 1
}

func strUpper(L *LState) int {
	str := L.CheckString(1)