/**
 * \file macros.h
 *
 * \brief   This file contains generic macros for the purpose of testing.
 */

/*
 *  Copyright (C) 2020, ARM Limited, All Rights Reserved
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */

#ifndef TEST_MACROS_H
#define TEST_MACROS_H

#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#include <stdlib.h>

#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#define mbedtls_fprintf    fprintf
#define mbedtls_snprintf   snprintf
#define mbedtls_calloc     calloc
#define mbedtls_free       free
#define mbedtls_exit       exit
#define mbedtls_time       time
#define mbedtls_time_t     time_t
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif

#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
#include "mbedtls/memory_buffer_alloc.h"
#endif

#define TEST_HELPER_ASSERT(a) if( !( a ) )                          \
{                                                                   \
    mbedtls_fprintf( stderr, "Assertion Failed at %s:%d - %s\n",    \
                             __FILE__, __LINE__, #a );              \
    mbedtls_exit( 1 );                                              \
}

#if defined(__GNUC__)
/* Test if arg and &(arg)[0] have the same type. This is true if arg is
 * an array but not if it's a pointer. */
#define IS_ARRAY_NOT_POINTER( arg )                                     \
    ( ! __builtin_types_compatible_p( __typeof__( arg ),                \
                                      __typeof__( &( arg )[0] ) ) )
#else
/* On platforms where we don't know how to implement this check,
 * omit it. Oh well, a non-portable check is better than nothing. */
#define IS_ARRAY_NOT_POINTER( arg ) 1
#endif

/* A compile-time constant with the value 0. If `const_expr` is not a
 * compile-time constant with a nonzero value, cause a compile-time error. */
#define STATIC_ASSERT_EXPR( const_expr )                                \
    ( 0 && sizeof( struct { int STATIC_ASSERT : 1 - 2 * ! ( const_expr ); } ) )
/* Return the scalar value `value` (possibly promoted). This is a compile-time
 * constant if `value` is. `condition` must be a compile-time constant.
 * If `condition` is false, arrange to cause a compile-time error. */
#define STATIC_ASSERT_THEN_RETURN( condition, value )   \
    ( STATIC_ASSERT_EXPR( condition ) ? 0 : ( value ) )

#define ARRAY_LENGTH_UNSAFE( array )            \
    ( sizeof( array ) / sizeof( *( array ) ) )
/** Return the number of elements of a static or stack array.
 *
 * \param array         A value of array (not pointer) type.
 *
 * \return The number of elements of the array.
 */
#define ARRAY_LENGTH( array )                                           \
    ( STATIC_ASSERT_THEN_RETURN( IS_ARRAY_NOT_POINTER( array ),         \
                                 ARRAY_LENGTH_UNSAFE( array ) ) )

/** Return the smaller of two values.
 *
 * \param x         An integer-valued expression without side effects.
 * \param y         An integer-valued expression without side effects.
 *
 * \return The smaller of \p x and \p y.
 */
#define MIN( x, y ) ( ( x ) < ( y ) ? ( x ) : ( y ) )

/** Return the larger of two values.
 *
 * \param x         An integer-valued expression without side effects.
 * \param y         An integer-valued expression without side effects.
 *
 * \return The larger of \p x and \p y.
 */
#define MAX( x, y ) ( ( x ) > ( y ) ? ( x ) : ( y ) )

/*
 * 32-bit integer manipulation macros (big endian)
 */
#ifndef GET_UINT32_BE
#define GET_UINT32_BE(n,b,i)                            \
{                                                       \
    (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
        | ( (uint32_t) (b)[(i) + 1] << 16 )             \
        | ( (uint32_t) (b)[(i) + 2] <<  8 )             \
        | ( (uint32_t) (b)[(i) + 3]       );            \
}
#endif

#ifndef PUT_UINT32_BE
#define PUT_UINT32_BE(n,b,i)                            \
{                                                       \
    (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
    (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
    (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
    (b)[(i) + 3] = (unsigned char) ( (n)       );       \
}
#endif

#endif /* TEST_MACROS_H */
