introduce lws_wsi_user

Signed-off-by: Andy Green <andy.green@linaro.org>

changelog

@@ -4,7 +4,7 @@ Changelog
 User api additions
 ------------------
 
-lws now exposes his internal platform file abstraction in a way that can be
+1) lws now exposes his internal platform file abstraction in a way that can be
 both used by user code to make it platform-agnostic, and be overridden or
 subclassed by user code.  This allows things like handling the URI "directory
 space" as a virtual filesystem that may or may not be backed by a regular
@@ -45,6 +45,9 @@ lws_plat_file_write(struct lws_plat_file_ops *fops, lws_filefd_type fd,
 The user code can also override or subclass the file operations, to either
 wrap or replace them.  An example is shown in test server.
 
+2) A new API void * lws_wsi_user(struct lws *wsi) lets you get the pointer to
+the user data associated with the wsi, just from the wsi.
+
 
 User api changes
 ----------------

lib/libwebsockets.c

@@ -941,6 +941,12 @@ lws_get_ctx(const struct lws *wsi)
 	return wsi->context;
 }
 
+LWS_VISIBLE LWS_EXTERN void *
+lws_wsi_user(struct lws *wsi)
+{
+	return wsi->user_space;
+}
+
 #ifdef LWS_WITH_OLD_API_WRAPPERS
 
 /*

lib/libwebsockets.h

@@ -1414,6 +1414,9 @@ lws_service_fd(struct lws_context *context,
 LWS_VISIBLE LWS_EXTERN void *
 lws_context_user(struct lws_context *context);
 
+LWS_VISIBLE LWS_EXTERN void *
+lws_wsi_user(struct lws *wsi);
+
 /*
  * NOTE: These public enums are part of the abi.  If you want to add one,
  * add it at where specified so existing users are unaffected.