From d477d9a06904c11cd8622da0a161ea6c2e080713 Mon Sep 17 00:00:00 2001
From: XeonSquared <redtailedairways@gmail.com>
Date: Mon, 31 Jul 2017 12:10:07 +1000
Subject: [PATCH] added a ported, minimal version of the fs API from MultICE

---
 modules/lib/fs.lua | 73 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 modules/lib/fs.lua

diff --git a/modules/lib/fs.lua b/modules/lib/fs.lua
new file mode 100644
index 0000000..89c62f6
--- /dev/null
+++ b/modules/lib/fs.lua
@@ -0,0 +1,73 @@
+do
+ _G.fs = {}
+ local fT,hT = {},{["_c"]=0}
+ function fs.mount(mp,pr)
+  fT[mp] = pr
+ end
+ function fs.simplify(p)
+  local pt,npt,rp = {},{},""
+  for P in p:gmatch("[^/]+") do
+   pt[#pt+1] = P
+  end
+  for k,v in pairs(pt) do
+   if v == ".." then
+    npt[#npt] = nil
+   elseif v ~= "." then
+    npt[#npt+1] = v
+   end
+  end
+  for k,v in pairs(npt) do
+   rp=rp.."/"..v
+  end
+  if p:sub(1,1) ~= "/" then rp = rp:sub(2) end
+  return rp
+ end
+ function fs.resolve(p)
+  if p:sub(1,1) ~= "/" then -- absolute/relative path
+   p=(os.getenv("PWD") or "").."/"..p
+  end
+  p=fs.simplify(p)
+  local pt = {}
+  for P in p:gmatch("[^/]+") do
+   pt[#pt+1] = P
+  end
+  return pt, p:match("/?(.-)/"), p:match("/?.-/(.+)")
+ end
+ function fs.open(p,m)
+  local _,d,p = fs.resolve(p)
+  local d = fT[d]
+  local f,C=d.open(p,m),hT._c
+  if f then
+   hT._c = C + 1
+   hT[C] = {d,f}
+   return C
+  end
+  return false
+ end
+ function fs.close(h)
+  if hT[h] then
+   hT[h][1].close(hT[h][2])
+  end
+  return false
+ end
+ function fs.read(h,n)
+  if hT[h] then
+   return hT[h][1].read(hT[h][2],n)
+  end
+  return false
+ end
+ function fs.readall(f)
+  local s=""
+  repeat
+   c=fs.read(f,2048)
+   s=s..c
+  until c==""
+  return s
+ end
+ function fs.write(h,d)
+  if hT[h] then
+   return hT[h][1].write(hT[h][2],d)
+  end
+  return false
+ end
+end