From eb1e6d0cb457e67a61b1e5d0c2a3360d1f98cd7c Mon Sep 17 00:00:00 2001
From: Ludovic Rousseau <ludovic.rousseau@gmail.com>
Date: Wed, 16 May 2012 13:15:34 +0000
Subject: [PATCH] Check log_put() printf-like format
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Thanks to Romain Tartière for the patch
http://groups.google.com/group/libnfc-devel/browse_thread/thread/da352d67e6965851
---
 libnfc/log.h | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/libnfc/log.h b/libnfc/log.h
index 40d3b2e..264a00b 100644
--- a/libnfc/log.h
+++ b/libnfc/log.h
@@ -23,11 +23,25 @@
 #endif // HAVE_CONFIG_H
 
 #if defined DEBUG
+
+#  ifndef __has_attribute
+#    define __has_attribute(x) 0
+#  endif
+
+#  if __has_attribute(format) || defined(__GNUC__)
+#    define __has_attribute_format 1
+#  endif
+
   // User want debug features
   #define LOGGING 1
   int	 log_init (void);
   int	 log_fini (void);
-  void log_put (const char *category, const char *priority, const char *format, ...);
+  void log_put (const char *category, const char *priority, const char *format, ...)
+#  if __has_attribute_format
+    __attribute__((format(printf, 3, 4)))
+#  endif
+    ;
+    
   
   #define NFC_PRIORITY_FATAL  "fatal"
   #define NFC_PRIORITY_ALERT  "alert"