Improve macro hygiene
This commit improves hygiene and formatting of macro definitions
throughout the library. Specifically:
- It adds brackets around parameters to avoid unintended
interpretation of arguments, e.g. due to operator precedence.
- It adds uses of the `do { ... } while( 0 )` idiom for macros that
can be used as commands.
diff --git a/include/mbedtls/bignum.h b/include/mbedtls/bignum.h
index a54c18e..1c86072 100644
--- a/include/mbedtls/bignum.h
+++ b/include/mbedtls/bignum.h
@@ -46,7 +46,12 @@
#define MBEDTLS_ERR_MPI_NOT_ACCEPTABLE -0x000E /**< The input arguments are not acceptable. */
#define MBEDTLS_ERR_MPI_ALLOC_FAILED -0x0010 /**< Memory allocation failed. */
-#define MBEDTLS_MPI_CHK(f) do { if( ( ret = f ) != 0 ) goto cleanup; } while( 0 )
+#define MBEDTLS_MPI_CHK(f) \
+ do \
+ { \
+ if( ( ret = (f) ) != 0 ) \
+ goto cleanup; \
+ } while( 0 )
/*
* Maximum size MPIs are allowed to grow to in number of limbs.