\def MBEDTLS_PLATFORM_C Enable the platform abstraction layer that allows you to re-assign functions like calloc(), free(), snprintf(), printf(), fprintf(), exit(). Enabling MBEDTLS_PLATFORM_C enables to use of MBEDTLS_PLATFORM_XXX_ALT or MBEDTLS_PLATFORM_XXX_MACRO directives, allowing the functions mentioned above to be specified at runtime or compile time respectively. Module: library/platform.c Caller: Most other .c files This module enables abstraction of common (libc) functions.