From e3853a9cb2a9a2cffa174d1334e2ca8ba610f151 Mon Sep 17 00:00:00 2001
From: Jose Antonio Ortega Ruiz <jao@gnu.org>
Date: Tue, 21 Dec 2010 02:36:35 +0100
Subject: Haskell sources moved to src/ to unclutter toplevel

---
 src/IWlib.hsc | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 src/IWlib.hsc

(limited to 'src/IWlib.hsc')

diff --git a/src/IWlib.hsc b/src/IWlib.hsc
new file mode 100644
index 0000000..5f7754d
--- /dev/null
+++ b/src/IWlib.hsc
@@ -0,0 +1,75 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  IWlib
+-- Copyright   :  (c) Jose A Ortega Ruiz
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+--  A partial binding to iwlib
+--
+-----------------------------------------------------------------------------
+
+{-# LANGUAGE CPP, ForeignFunctionInterface, EmptyDataDecls #-}
+
+
+module IWlib (WirelessInfo(..), getWirelessInfo) where
+
+import Foreign
+import Foreign.C.Types
+import Foreign.C.String
+
+data WirelessInfo = WirelessInfo { wiEssid :: String,  wiQuality :: Int }
+                  deriving Show
+
+#include <iwlib.h>
+
+data WCfg
+data WStats
+data WRange
+
+foreign import ccall "iwlib.h iw_sockets_open"
+  c_iw_open :: IO CInt
+
+foreign import ccall "unistd.h close"
+  c_iw_close :: CInt -> IO ()
+
+foreign import ccall "iwlib.h iw_get_basic_config"
+  c_iw_basic_config :: CInt -> CString -> Ptr WCfg -> IO CInt
+
+foreign import ccall "iwlib.h iw_get_stats"
+  c_iw_stats :: CInt -> CString -> Ptr WStats -> Ptr WRange -> CInt -> IO CInt
+
+foreign import ccall "iwlib.h iw_get_range_info"
+  c_iw_range :: CInt -> CString -> Ptr WRange -> IO CInt
+
+getWirelessInfo :: String -> IO WirelessInfo
+getWirelessInfo iface =
+  allocaBytes (#size struct wireless_config) $ \wc ->
+  allocaBytes (#size struct iw_statistics) $ \stats ->
+  allocaBytes (#size struct iw_range) $ \rng ->
+  withCString iface $ \istr -> do
+    i <- c_iw_open
+    bcr <- c_iw_basic_config i istr wc
+    str <- c_iw_stats i istr stats rng 1
+    rgr <- c_iw_range i istr rng
+    c_iw_close i
+    if (bcr < 0) then return WirelessInfo { wiEssid = "", wiQuality = 0 } else
+      do hase <- (#peek struct wireless_config, has_essid) wc :: IO CInt
+         eon <- (#peek struct wireless_config, essid_on) wc :: IO CInt
+         essid <- if hase /= 0 && eon /= 0 then
+                    do let e = (#ptr struct wireless_config, essid) wc
+                       peekCString e
+                  else return ""
+         q <- if str >= 0 && rgr >=0 then
+                do qualv <- xqual $ (#ptr struct iw_statistics, qual) stats
+                   mv <- xqual $ (#ptr struct iw_range, max_qual) rng
+                   let mxv = if mv /= 0 then fromIntegral mv else 1
+                   return $ fromIntegral qualv / mxv
+              else return 0
+         let qv = round (100 * (q :: Double))
+         return $ WirelessInfo { wiEssid = essid, wiQuality = min 100 qv }
+    where xqual p = let qp = (#ptr struct iw_param, value) p in
+            (#peek struct iw_quality, qual) qp :: IO CChar
-- 
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