Use QTextStream and QFile instead of read/sscanf for parsing

ChipSelect3 (cs3). This should make it more robust

1 files changed, 17 insertions, 19 deletions

diff --git a/libopie2/opiecore/device/odevice_simpad.cpp b/libopie2/opiecore/device/odevice_simpad.cpp
index 9fde7f9..2e54216 100644
--- a/libopie2/opiecore/device/odevice_simpad.cpp
+++ b/libopie2/opiecore/device/odevice_simpad.cpp
@@ -202,73 +202,71 @@ void SIMpad::initButtons()
 
 //SIMpad touchscreen backlight strength control
 #define SIMPAD_BACKLIGHT_CONTROL "/proc/driver/mq200/backlight"
 
 
 /*
  * The SIMpad exposes ChipSelect3 to userspace
  * via a proc filesystem file. Using this register
  * one can toggle power of serial, irda, dect circuits
  * change the video driver and display status and
  * many more things.
  * To not lose the current setting we read the current
  * cs3 setting and toggle the necessary bits and then
  * write it.
  */
 static bool setCS3Bit(  bool bitset, int bit ) {
-    int cs3_fd = ::open( SIMPAD_BOARDCONTROL, O_RDONLY );
-
-    if ( cs3_fd < 0 )
+    QFile file( SIMPAD_BOARDCONTROL );
+    if ( !file.open( IO_ReadOnly ) )
         return false;
 
-    static char line[32];
-    int  val = 0;
-    bool ok  = false;
+    unsigned int val = 0;
+    bool ok = false;
+    QTextStream stream( &file );
 
     /*
-     * try to read and parse the Chipselect3 status
-     * be paranoid and make sure line[31] is null
-     * terminated
+     * Use QFile and QTextStream for parsing to be more
+     * robust
      */
-    while( !ok && ::read(cs3_fd, &line, sizeof(line)) > 0 ) {
-        line[31] = '\0';
-        if (::sscanf(line, "Chipselect3 : %x", &val ))
+    while ( !stream.atEnd() ) {
+        QString line = stream.readLine();
+        if ( line.startsWith( "Chipselect3 : " ) ) {
+            val = line.mid( 15 ).toUInt( 0, 16 );
             ok = true;
+            break;
+        }
     }
 
-    ::close(cs3_fd);
-
-    /*
-     * we were not able to find the current value
-     * and as a result we won't set it
-     */
     if ( !ok )
         return false;
 
+    file.close();
+
     /*
      * change the value
      */
     val = bitset ? (val | bit) : (val & ~bit);
 
     /*
      * write it back
      */
-    cs3_fd = ::open( SIMPAD_BOARDCONTROL, O_WRONLY );
+    int cs3_fd = ::open( SIMPAD_BOARDCONTROL, O_WRONLY );
     if ( cs3_fd < 0 )
         return false;
 
+    char line[32];
     ::snprintf(line, sizeof(line), "0x%04x\n", val);
     ::write(cs3_fd, line, strlen(line));
     ::close(cs3_fd);
 
     return true;
 }
 
 
 QValueList <OLed> SIMpad::ledList() const
 {
     QValueList <OLed> vl;
     vl << Led_Power; //FIXME which LED is LED2 ? The green one or the amber one?
     //vl << Led_Mail; //TODO find out if LED1 is accessible anyway
     return vl;
 }