Add a configuration fix for vsnprintf for non-conforming platforms
!defined(MBEDTLS_PLATFORM_SNPRINTF_MACRO)
#define MBEDTLS_PLATFORM_SNPRINTF_ALT
#endif
+
+#if !defined(MBEDTLS_PLATFORM_VSNPRINTF_ALT) && \
+ !defined(MBEDTLS_PLATFORM_VSNPRINTF_MACRO)
+#define MBEDTLS_PLATFORM_VSNPRINTF_ALT
+#endif
#endif /* _WIN32 */
#if defined(TARGET_LIKE_MBED) && \
