whb: Add ability to remove logging functions

* WHBRemoveLogHandler will look through the "registry" of logging
functions, and will set the entry to NULL if it matches what the user
passes.
* WHBLogUdpDeinit will correctly close the socket and shut down the
socket library in addition to removing its entry in the registry.

samples/gx2/triangle/src/main.c

@@ -116,5 +116,6 @@ exit:
    WHBUnmountSdCard();
    WHBGfxShutdown();
    WHBProcShutdown();
+   WHBLogUdpDeinit();
    return result;
 }

src/libwhb/include/whb/log.h

@@ -16,6 +16,9 @@ typedef void (*LogHandlerFn)(const char *msg);
 BOOL
 WHBAddLogHandler(LogHandlerFn fn);
 
+BOOL
+WHBRemoveLogHandler(LogHandlerFn fn);
+
 BOOL
 WHBLogWrite(const char *str);
 

src/libwhb/include/whb/log_cafe.h

@@ -14,6 +14,9 @@ extern "C" {
 BOOL
 WHBLogCafeInit();
 
+BOOL
+WHBLogCafeDeinit();
+
 #ifdef __cplusplus
 }
 #endif

src/libwhb/include/whb/log_udp.h

@@ -14,6 +14,9 @@ extern "C" {
 BOOL
 WHBLogUdpInit();
 
+BOOL
+WHBLogUdpDeinit();
+
 #ifdef __cplusplus
 }
 #endif

src/libwhb/src/log.c

@@ -25,6 +25,21 @@ WHBAddLogHandler(LogHandlerFn fn)
    return FALSE;
 }
 
+BOOL
+WHBRemoveLogHandler(LogHandlerFn fn)
+{
+   int i;
+
+   for(i = 0; i < MAX_HANDLERS; ++i) {
+      if(sHandlers[i] == fn) {
+         sHandlers[i] = NULL;
+         return TRUE;
+      }
+   }
+
+   return FALSE;
+}
+
 BOOL
 WHBLogWrite(const char *str)
 {

src/libwhb/src/log_cafe.c

@@ -19,6 +19,11 @@ cafeLogHandler(const char * msg)
 BOOL
 WHBLogCafeInit()
 {
-   WHBAddLogHandler(cafeLogHandler);
-   return TRUE;
+   return WHBAddLogHandler(cafeLogHandler);
+}
+
+BOOL
+WHBLogCafeDeinit()
+{
+   return WHBRemoveLogHandler(cafeLogHandler);
 }

src/libwhb/src/log_udp.c

@@ -42,6 +42,16 @@ WHBLogUdpInit()
    sSendAddr.sin_port = htons(SERVER_PORT);
    sSendAddr.sin_addr.s_addr = htonl(INADDR_BROADCAST);
 
-   WHBAddLogHandler(udpLogHandler);
-   return TRUE;
+   return WHBAddLogHandler(udpLogHandler);
+}
+
+BOOL
+WHBLogUdpDeinit()
+{
+   if(shutdown(sSocket, SHUT_WR) != 0) {
+      return FALSE;
+   }
+
+   socket_lib_finish();
+   return WHBRemoveLogHandler(udpLogHandler);
 }