added fbuf_detach() to the API

to allow detaching an internal buffer from the fbuf

src/fbuf.c

@@ -293,6 +293,26 @@ fbuf_clear(fbuf_t *fbuf)
         fbuf->data[0] = '\0';
 }
 
+unsigned int fbuf_detach(fbuf_t *fbuf, char **buf)
+{
+    if (!fbuf->used)
+        return 0;
+
+    if (fbuf->skip)
+        fbuf_shrink(fbuf);
+
+    unsigned int len = fbuf->used;
+
+    *buf = fbuf->data;
+
+    fbuf->used = 0;
+    fbuf->skip = 0;
+    fbuf->len = 0;
+    fbuf->data = NULL;
+
+    return len;
+}
+
 void
 fbuf_destroy(fbuf_t *fbuf)
 {

src/fbuf.h

@@ -121,6 +121,14 @@ unsigned int fbuf_shrink(fbuf_t *fbuf);
  */
 void fbuf_clear(fbuf_t *fbuf);
 
+/**
+ * @brief Detach the underlying buffer and reset the fbuf
+ * @param fbuf fbuf
+ * @param buf A reference to the pointer where to store the addres of the actual buffer
+ * @returns The size of the detached buffer (now stored in *buf)
+ */
+unsigned int fbuf_detach(fbuf_t *fbuf, char **buf);
+
 /**
  * @brief Destroys all information in the fbuf.
  * @param fbuf fbuf