zephyr: Fix bug where prototype of SNPRINTF was not declared

SebastianBoe · SebastianBoe · commit 7f25dd051480 · 2019-03-01T11:57:34.000+01:00
Fix #10990.

A warning is triggered when snprintf is used because it is being
declared / configured incorrectly. The MBEDTLS configuration is
defaulting to disabling all of LIBC, and then explicitly enabling the
LIBC functions in use, this has been done for printf with
MBEDTLS_PLATFORM_STD_PRINTF, but not for
MBEDTLS_PLATFORM_STD_SNPRINTF.

Signed-off-by: Sebastian Bøe &lt;sebastian.boe@nordicsemi.no&gt;
diff --git a/boot/zephyr/include/config-kw.h b/boot/zephyr/include/config-kw.h
@@ -43,6 +43,7 @@
 #define MBEDTLS_NO_PLATFORM_ENTROPY
 #define MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
 #define MBEDTLS_PLATFORM_PRINTF_ALT
+#define MBEDTLS_PLATFORM_SNPRINTF_ALT
 
 #define MBEDTLS_ASN1_PARSE_C
 
diff --git a/boot/zephyr/include/config-rsa-kw.h b/boot/zephyr/include/config-rsa-kw.h
@@ -43,6 +43,7 @@
 #define MBEDTLS_NO_PLATFORM_ENTROPY
 #define MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
 #define MBEDTLS_PLATFORM_PRINTF_ALT
+#define MBEDTLS_PLATFORM_SNPRINTF_ALT
 
 #if !defined(CONFIG_ARM)
 #define MBEDTLS_HAVE_ASM
diff --git a/boot/zephyr/include/config-rsa.h b/boot/zephyr/include/config-rsa.h
@@ -43,6 +43,7 @@
 #define MBEDTLS_NO_PLATFORM_ENTROPY
 #define MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
 #define MBEDTLS_PLATFORM_PRINTF_ALT
+#define MBEDTLS_PLATFORM_SNPRINTF_ALT
 
 #if !defined(CONFIG_ARM)
 #define MBEDTLS_HAVE_ASM
