From b275859a3736e1ca0e088ae04db992200218d832 Mon Sep 17 00:00:00 2001
From: Patrick Pelissier <patrick.pelissier@gmail.com>
Date: Sun, 13 Apr 2025 16:08:38 +0200
Subject: [PATCH] Fix issue if BString is empty

---
 m-bstring.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/m-bstring.h b/m-bstring.h
index 85ff86b0..913a30b4 100644
--- a/m-bstring.h
+++ b/m-bstring.h
@@ -453,6 +453,10 @@ m_bstring_fwrite(FILE *f, const m_bstring_t v)
 {
   M_BSTRING_CONTRACT (v);
   M_ASSERT (f != NULL);
+  if (M_UNLIKELY(m_bstring_size(v) == 0)) {
+    return 0;
+  }
+  M_ASSERT(m_bstr1ng_cstr(v) != NULL);
   return fwrite(m_bstr1ng_cstr(v), 1, m_bstring_size(v), f);
 }