1 files changed, 18 insertions, 3 deletions
diff --git a/src/numfmt.c b/src/numfmt.c
index 9a321d697..8c21c2b3a 100644
--- a/src/numfmt.c
+++ b/src/numfmt.c
@@ -190,13 +190,28 @@ static uintmax_t header = 0;
    error (similar to sort's debug).  */
 static bool debug;
 
-/* debugging for developers.  Enables devmsg().  */
-bool dev_debug = false;
-
 /* will be set according to the current locale.  */
 static const char *decimal_point;
 static int decimal_point_length;
 
+/* debugging for developers.  Enables devmsg().  */
+static bool dev_debug = false;
+
+/* Like error(0, 0, ...), but without an implicit newline.
+   Also a noop unless the global DEV_DEBUG is set.
+   TODO: Replace with variadic macro in system.h or
+   move to a separate module.  */
+static inline void
+devmsg (char const *fmt, ...)
+{
+  if (dev_debug)
+    {
+      va_list ap;
+      va_start (ap, fmt);
+      vfprintf (stderr, fmt, ap);
+      va_end (ap);
+    }
+}
 
 static inline int
 default_scale_base (enum scale_type scale)