add platform_set_snprintf
diff --git a/include/polarssl/platform.h b/include/polarssl/platform.h
index 127b7fe..4844d2d 100644
--- a/include/polarssl/platform.h
+++ b/include/polarssl/platform.h
@@ -50,6 +50,9 @@
#if !defined(POLARSSL_PLATFORM_NO_STD_FUNCTIONS)
#include <stdio.h>
#include <stdlib.h>
+#if !defined(POLARSSL_PLATFORM_STD_SNPRINTF)
+#define POLARSSL_PLATFORM_STD_SNPRINTF snprintf /**< Default snprintf to use */
+#endif
#if !defined(POLARSSL_PLATFORM_STD_PRINTF)
#define POLARSSL_PLATFORM_STD_PRINTF printf /**< Default printf to use */
#endif
@@ -93,6 +96,25 @@
#endif /* POLARSSL_PLATFORM_MEMORY */
/*
+ * The function pointers for snprintf
+ */
+#if defined(POLARSSL_PLATFORM_SNPRINTF_ALT)
+extern int (*polarssl_snprintf)( char * s, size_t n, const char * format, ... );
+
+/**
+ * \brief Set your own snprintf function pointer
+ *
+ * \param snprintf_func the snprintf function implementation
+ *
+ * \return 0
+ */
+int platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
+ const char * format, ... ) );
+#else /* POLARSSL_PLATFORM_SNPRINTF_ALT */
+#define polarssl_snprintf snprintf
+#endif /* POLARSSL_PLATFORM_SNPRINTF_ALT */
+
+/*
* The function pointers for printf
*/
#if defined(POLARSSL_PLATFORM_PRINTF_ALT)