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/asn1write.h b/include/mbedtls/asn1write.h
index 360540a..a194243 100644
--- a/include/mbedtls/asn1write.h
+++ b/include/mbedtls/asn1write.h
@@ -33,11 +33,12 @@
#include "asn1.h"
#define MBEDTLS_ASN1_CHK_ADD(g, f) \
- do { \
- if( ( ret = f ) < 0 ) \
+ do \
+ { \
+ if( ( ret = (f) ) < 0 ) \
return( ret ); \
else \
- g += ret; \
+ (g) += ret; \
} while( 0 )
#ifdef __cplusplus
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.
diff --git a/include/mbedtls/padlock.h b/include/mbedtls/padlock.h
index f05b72b..721a5d4 100644
--- a/include/mbedtls/padlock.h
+++ b/include/mbedtls/padlock.h
@@ -59,7 +59,7 @@
#define MBEDTLS_PADLOCK_PHE 0x0C00
#define MBEDTLS_PADLOCK_PMM 0x3000
-#define MBEDTLS_PADLOCK_ALIGN16(x) (uint32_t *) (16 + ((int32_t) x & ~15))
+#define MBEDTLS_PADLOCK_ALIGN16(x) (uint32_t *) (16 + ((int32_t) (x) & ~15))
#ifdef __cplusplus
extern "C" {
diff --git a/include/mbedtls/x509_crt.h b/include/mbedtls/x509_crt.h
index 3dd5922..670bd10 100644
--- a/include/mbedtls/x509_crt.h
+++ b/include/mbedtls/x509_crt.h
@@ -98,7 +98,7 @@
* Build flag from an algorithm/curve identifier (pk, md, ecp)
* Since 0 is always XXX_NONE, ignore it.
*/
-#define MBEDTLS_X509_ID_FLAG( id ) ( 1 << ( id - 1 ) )
+#define MBEDTLS_X509_ID_FLAG( id ) ( 1 << ( (id) - 1 ) )
/**
* Security profile for certificate verification.