diff --git a/mongoose.c b/mongoose.c
index a8914595..d341c76b 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -29,6 +29,11 @@
 #define __STDC_LIMIT_MACROS   // C++ wants that for INT64_MAX
 #endif
 
+#if defined (_MSC_VER)
+#pragma warning (disable : 4127)    // conditional expression is constant: introduced by FD_SET(..)
+#pragma warning (disable : 4204)    // non-constant aggregate initializer: issued due to missing C99 support
+#endif
+
 // Disable WIN32_LEAN_AND_MEAN.
 // This makes windows.h always include winsock2.h
 #ifdef WIN32_LEAN_AND_MEAN
@@ -146,6 +151,8 @@ static int pthread_mutex_lock(pthread_mutex_t *);
 static int pthread_mutex_unlock(pthread_mutex_t *);
 
 static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
+
+struct file;
 static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
 
 #if defined(HAVE_STDINT)
@@ -1639,13 +1646,7 @@ static int url_decode(const char *src, int src_len, char *dst,
   return i >= src_len ? j : -1;
 }
 
-// Scan given buffer and fetch the value of the given variable.
-// It can be specified in query string, or in the POST data.
-// Return -1 if the variable not found, or length of the URL-decoded value
-// stored in dst. The dst buffer is guaranteed to be NUL-terminated if it
-// is not NULL or zero-length. If dst is NULL or zero-length, then
-// -2 is returned.
-int mg_get_var(const char *buf, size_t buf_len, const char *name,
+int mg_get_var(const char *data, size_t data_len, const char *name,
                char *dst, size_t dst_len) {
   const char *p, *e, *s;
   size_t name_len;
@@ -1653,18 +1654,18 @@ int mg_get_var(const char *buf, size_t buf_len, const char *name,
 
   if (dst == NULL || dst_len == 0) {
     len = -2;
-  } else if (buf == NULL || name == NULL || buf_len == 0) {
+  } else if (data == NULL || name == NULL || data_len == 0) {
     len = -1;
     dst[0] = '\0';
   } else {
     name_len = strlen(name);
-    e = buf + buf_len;
+    e = data + data_len;
     len = -1;
     dst[0] = '\0';
 
-    // buf is "var1=val1&var2=val2...". Find variable first
-    for (p = buf; p + name_len < e; p++) {
-      if ((p == buf || p[-1] == '&') && p[name_len] == '=' &&
+    // data is "var1=val1&var2=val2...". Find variable first
+    for (p = data; p + name_len < e; p++) {
+      if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
           !mg_strncasecmp(name, p, name_len)) {
 
         // Point p to variable value
@@ -1679,6 +1680,11 @@ int mg_get_var(const char *buf, size_t buf_len, const char *name,
 
         // Decode variable into destination buffer
         len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
+        
+        // Redirect error code from -1 to -2 (destination buffer too small).
+        if (len == -1) {
+          len = -2;
+        }
         break;
       }
     }
@@ -1886,6 +1892,7 @@ static const struct {
   {".mp3", 4, "audio/x-mp3"},
   {".mid", 4, "audio/mid"},
   {".m3u", 4, "audio/x-mpegurl"},
+  {".ogg", 4, "audio/ogg"},
   {".ram", 4, "audio/x-pn-realaudio"},
   {".xml", 4, "text/xml"},
   {".json",  5, "text/json"},
@@ -5075,6 +5082,7 @@ struct mg_context *mg_start(mg_callback_t user_callback, void *user_data,
     }
     if (ctx->config[i] != NULL) {
       cry(fc(ctx), "warning: %s: duplicate option", name);
+      free(ctx->config[i]);
     }
     ctx->config[i] = mg_strdup(value);
     DEBUG_TRACE(("[%s] -> [%s]", name, value));
diff --git a/mongoose.h b/mongoose.h
index c51baad4..a9f98c34 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -286,19 +286,19 @@ const char *mg_get_header(const struct mg_connection *, const char *name);
 //         or request_info.query_string.
 //   data_len: length of the encoded data.
 //   var_name: variable name to decode from the buffer
-//   buf: destination buffer for the decoded variable
-//   buf_len: length of the destination buffer
+//   dst: destination buffer for the decoded variable
+//   dst_len: length of the destination buffer
 //
 // Return:
 //   On success, length of the decoded variable.
 //   On error:
-//      -1 (variable not found, or destination buffer is too small).
-//      -2 (destination buffer is NULL or zero length).
+//      -1 (variable not found).
+//      -2 (destination buffer is NULL, zero length or too small to hold the decoded variable).
 //
 // Destination buffer is guaranteed to be '\0' - terminated if it is not
-// NULL or zero length. In case of failure, dst[0] == '\0'.
+// NULL or zero length.
 int mg_get_var(const char *data, size_t data_len,
-               const char *var_name, char *buf, size_t buf_len);
+               const char *var_name, char *dst, size_t dst_len);
 
 // Fetch value of certain cookie variable into the destination buffer.
 //