Localize a few variables

bit32.lua

@@ -3,12 +3,12 @@ bit32 = {}
 local N = 32
 local P = 2^N
 
-bit32.bnot = function(x)
+function bit32.bnot(x)
 	x = x % P
 	return P - 1 - x
 end
 
-bit32.band = function(x, y)
+function bit32.band(x, y)
 	-- Common usecases, they deserve to be optimized
 	if y == 0xff then return x % 0x100 end
 	if y == 0xffff then return x % 0x10000 end
@@ -18,7 +18,7 @@ bit32.band = function(x, y)
 	local r = 0
 	local p = 1
 	for i = 1, N do
-		a, b = x%2, y%2
+		local a, b = x % 2, y % 2
 		x, y = math.floor(x / 2), math.floor(y / 2)
 		if a + b == 2 then
 			r = r + p
@@ -28,7 +28,7 @@ bit32.band = function(x, y)
 	return r
 end
 
-bit32.bor = function(x, y)
+function bit32.bor(x, y)
 	-- Common usecases, they deserve to be optimized
 	if y == 0xff then return x - (x%0x100) + 0xff end
 	if y == 0xffff then return x - (x%0x10000) + 0xffff end
@@ -38,7 +38,7 @@ bit32.bor = function(x, y)
 	local r = 0
 	local p = 1
 	for i = 1, N do
-		a, b = x%2, y%2
+		local a, b = x % 2, y % 2
 		x, y = math.floor(x / 2), math.floor(y / 2)
 		if a + b >= 1 then
 			r = r + p
@@ -48,12 +48,12 @@ bit32.bor = function(x, y)
 	return r
 end
 
-bit32.bxor = function(x, y)
+function bit32.bxor(x, y)
 	x, y = x % P, y % P
 	local r = 0
 	local p = 1
 	for i = 1, N do
-		a, b = x%2, y%2
+		local a, b = x%2, y%2
 		x, y = math.floor(x/2), math.floor(y/2)
 		if a + b == 1 then
 			r = r + p
@@ -63,7 +63,7 @@ bit32.bxor = function(x, y)
 	return r
 end
 
-bit32.lshift = function(x, s_amount)
+function bit32.lshift(x, s_amount)
 	if math.abs(s_amount) >= N then return 0 end
 	x = x % P
 	if s_amount < 0 then
@@ -73,7 +73,7 @@ bit32.lshift = function(x, s_amount)
 	end
 end
 
-bit32.rshift = function(x, s_amount)
+function bit32.rshift(x, s_amount)
 	if math.abs(s_amount) >= N then return 0 end
 	x = x % P
 	if s_amount > 0 then
@@ -83,7 +83,7 @@ bit32.rshift = function(x, s_amount)
 	end
 end
 
-bit32.arshift = function(x, s_amount)
+function bit32.arshift(x, s_amount)
 	if math.abs(s_amount) >= N then return 0 end
 	x = x % P
 	if s_amount > 0 then

cptr.lua

@@ -159,7 +159,7 @@ function run_computer(turtle, cptr)
 	if cptr.stopped then return end
 	cptr.cycles = math.max(MAX_CYCLES, cptr.cycles + CYCLES_PER_STEP)
 	while true do
-		instr = cptr[cptr.PC]
+		local instr = cptr[cptr.PC]
 		local f = ITABLE[instr]
 		if f == nil then return end
 		cptr.PC = u16(cptr.PC + 1)

screen.lua

@@ -28,7 +28,7 @@ end
 
 local function escape(text)
 	-- Remove all \0's in the string, that cannot be done using string.gsub as there can't be \0's in a pattern
-	text2 = ""
+	local text2 = ""
 	for i = 1, string.len(text) do
 		if string.byte(text, i) ~= 0 then text2 = text2 .. string.sub(text, i, i) end
 	end
@@ -48,8 +48,8 @@ end
 
 function screen.create_text_formspec(text, basex, basey)
 	local f = lines(text)
-	s = ""
-	i = basey - 0.25
+	local s = ""
+	local i = basey - 0.25
 	for _, x in ipairs(f) do
 		s = s .. "]label[" .. basex .. "," .. tostring(i) .. ";" .. escape(x)
 		i = i + 0.3