commit ab1794f57659a77ad66defbc7ea5cb8afb920b2f
author Antonio Nino Diaz <antonio.ninodiaz@arm.com> Fri May 19 11:37:22 2017 +0100
committer Antonio Nino Diaz <antonio.ninodiaz@arm.com> Wed May 24 10:47:05 2017 +0100
tree 76459c6bdabaa7a1627199be6f97650634e7f636
parent da5241cb1591416d6aeba9f30ce395b58c97cb5d

mbedtls: Use `tf_snprintf` instead of `snprintf`

The Trusted Firmware uses a subset of the APIs provided by mbed TLS.
This subset internally uses `snprintf`, but the only format specifier
used is '%d', which is supported by `tf_snprintf`.

This patch makes mbed TLS use `tf_snprintf` instead of `snprintf`,
saving 3 KB in both debug and release builds when TBBR is enabled.

Change-Id: I7f992a21015930d7c0f4660e7a28ceefd60b9597
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

include/drivers/auth/mbedtls/mbedtls_config.h

diff --git a/include/drivers/auth/mbedtls/mbedtls_config.h b/include/drivers/auth/mbedtls/mbedtls_config.h
index 7d8d17c..22e7574 100644
--- a/include/drivers/auth/mbedtls/mbedtls_config.h
+++ b/include/drivers/auth/mbedtls/mbedtls_config.h
@@ -19,6 +19,8 @@
 
 #define MBEDTLS_PLATFORM_MEMORY
 #define MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
+/* Prevent mbed TLS from using snprintf so that it can use tf_snprintf. */
+#define MBEDTLS_PLATFORM_SNPRINTF_ALT
 
 #define MBEDTLS_PKCS1_V15
 #define MBEDTLS_PKCS1_V21