From 8072b0a7d486bdab970406af3742402a051abe77 Mon Sep 17 00:00:00 2001
From: Sergey Lyubka <valenok@gmail.com>
Date: Thu, 13 Sep 2012 21:58:37 +0100
Subject: [PATCH] Do not report error if mg_printf() printed 0 bytes

---
 mongoose.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mongoose.c b/mongoose.c
index 844afa34..5276b2f0 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -1492,7 +1492,9 @@ int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
   len = vsnprintf(mem, sizeof(mem), fmt, ap);
   va_end(ap);
 
-  if (len <= 0) {
+  if (len == 0) {
+    // Do nothing. mg_printf(conn, "%s", "") was called.
+  } else if (len < 0) {
     // vsnprintf() error, give up
     len = -1;
     cry(conn, "%s(%s, ...): vsnprintf() error", __func__, fmt);