1 files changed, 6 insertions, 0 deletions
diff --git a/printf.c b/printf.c
index 370c8e9b0..4288f0241 100644
--- a/printf.c
+++ b/printf.c
@@ -145,6 +145,12 @@ mpfr_snprintf (char *buf, size_t size, const char *fmt, ...)
 {
   va_list ap;
   int ret;
+
+  if (size == 0)
+    return 0;
+
+  MPFR_ASSERTD (buf != NULL);
+
   va_start (ap, fmt);
 
   ret = mpfr_vsnprintf (buf, size, fmt, ap);