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| author | Hanno Becker <hanno.becker@arm.com> | 2018-10-15 12:01:35 +0100 |
|---|---|---|
| committer | Gilles Peskine <Gilles.Peskine@arm.com> | 2019-04-24 10:51:54 +0200 |
| commit | d6028a1894ed9675769b13ae619a0ea6d937882b (patch) | |
| tree | 65e59c44d1000f2c5ff30c3977a18e8c8d497057 /library/ecp.c | |
| parent | 20d707dd3eb9deadb5efe94c09fa6f105c56c5f1 (diff) | |
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.
Diffstat (limited to 'library/ecp.c')
| -rw-r--r-- | library/ecp.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/library/ecp.c b/library/ecp.c index ecea5910..db36191b 100644 --- a/library/ecp.c +++ b/library/ecp.c @@ -1046,25 +1046,29 @@ cleanup: #define INC_MUL_COUNT #endif -#define MOD_MUL( N ) do { MBEDTLS_MPI_CHK( ecp_modp( &N, grp ) ); INC_MUL_COUNT } \ - while( 0 ) +#define MOD_MUL( N ) \ + do \ + { \ + MBEDTLS_MPI_CHK( ecp_modp( &(N), grp ) ); \ + INC_MUL_COUNT \ + } while( 0 ) /* * Reduce a mbedtls_mpi mod p in-place, to use after mbedtls_mpi_sub_mpi * N->s < 0 is a very fast test, which fails only if N is 0 */ -#define MOD_SUB( N ) \ - while( N.s < 0 && mbedtls_mpi_cmp_int( &N, 0 ) != 0 ) \ - MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &N, &N, &grp->P ) ) +#define MOD_SUB( N ) \ + while( (N).s < 0 && mbedtls_mpi_cmp_int( &(N), 0 ) != 0 ) \ + MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &(N), &(N), &grp->P ) ) /* * Reduce a mbedtls_mpi mod p in-place, to use after mbedtls_mpi_add_mpi and mbedtls_mpi_mul_int. * We known P, N and the result are positive, so sub_abs is correct, and * a bit faster. */ -#define MOD_ADD( N ) \ - while( mbedtls_mpi_cmp_mpi( &N, &grp->P ) >= 0 ) \ - MBEDTLS_MPI_CHK( mbedtls_mpi_sub_abs( &N, &N, &grp->P ) ) +#define MOD_ADD( N ) \ + while( mbedtls_mpi_cmp_mpi( &(N), &grp->P ) >= 0 ) \ + MBEDTLS_MPI_CHK( mbedtls_mpi_sub_abs( &(N), &(N), &grp->P ) ) #if defined(ECP_SHORTWEIERSTRASS) /* |