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Improve macro hygiene

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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.
This commit is contained in:
Hanno Becker 2018-10-15 12:01:35 +01:00 • committed by Gilles Peskine
parent 20d707dd3e
commit d6028a1894
23 changed files with 325 additions and 252 deletions
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21
library/md5.c
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@ -136,19 +136,22 @@ int mbedtls_internal_md5_process( mbedtls_md5_context *ctx,
GET_UINT32_LE( X[14], data, 56 );
GET_UINT32_LE( X[15], data, 60 );
#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))
#define S(x,n) \
( ( (x) << (n) ) | ( ( (x) & 0xFFFFFFFF) >> ( 32 - (n) ) ) )
#define P(a,b,c,d,k,s,t) \
{ \
a += F(b,c,d) + X[k] + t; a = S(a,s) + b; \
}
#define P(a,b,c,d,k,s,t) \
do \
{ \
(a) += F((b),(c),(d)) + X[k] + (t); \
(a) = S((a),(s)) + (b); \
} while( 0 )
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
#define F(x,y,z) (z ^ (x & (y ^ z)))
#define F(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
P( A, B, C, D, 0, 7, 0xD76AA478 );
P( D, A, B, C, 1, 12, 0xE8C7B756 );
@ -169,7 +172,7 @@ int mbedtls_internal_md5_process( mbedtls_md5_context *ctx,
#undef F
#define F(x,y,z) (y ^ (z & (x ^ y)))
#define F(x,y,z) ((y) ^ ((z) & ((x) ^ (y))))
P( A, B, C, D, 1, 5, 0xF61E2562 );
P( D, A, B, C, 6, 9, 0xC040B340 );
@ -190,7 +193,7 @@ int mbedtls_internal_md5_process( mbedtls_md5_context *ctx,
#undef F
#define F(x,y,z) (x ^ y ^ z)
#define F(x,y,z) ((x) ^ (y) ^ (z))
P( A, B, C, D, 5, 4, 0xFFFA3942 );
P( D, A, B, C, 8, 11, 0x8771F681 );
@ -211,7 +214,7 @@ int mbedtls_internal_md5_process( mbedtls_md5_context *ctx,
#undef F
#define F(x,y,z) (y ^ (x | ~z))
#define F(x,y,z) ((y) ^ ((x) | ~(z)))
P( A, B, C, D, 0, 6, 0xF4292244 );
P( D, A, B, C, 7, 10, 0x432AFF97 );