include/internal/numbers.h

/*
 * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#ifndef OSSL_INTERNAL_NUMBERS_H
#define OSSL_INTERNAL_NUMBERS_H
#pragma once

#include <limits.h>

#if (-1 & 3) == 0x03 /* Two's complement */

#define __MAXUINT__(T) ((T) - 1)
#define __MAXINT__(T) ((T)((((T)1) << ((sizeof(T) * CHAR_BIT) - 1)) ^ __MAXUINT__(T)))
#define __MININT__(T) (-__MAXINT__(T) - 1)

#elif (-1 & 3) == 0x02 /* One's complement */

#define __MAXUINT__(T) (((T) - 1) + 1)
#define __MAXINT__(T) ((T)((((T)1) << ((sizeof(T) * CHAR_BIT) - 1)) ^ __MAXUINT__(T)))
#define __MININT__(T) (-__MAXINT__(T))

#elif (-1 & 3) == 0x01 /* Sign/magnitude */

#define __MAXINT__(T) ((T)(((((T)1) << ((sizeof(T) * CHAR_BIT) - 2)) - 1) | (((T)1) << ((sizeof(T) * CHAR_BIT) - 2))))
#define __MAXUINT__(T) ((T)(__MAXINT__(T) | (((T)1) << ((sizeof(T) * CHAR_BIT) - 1))))
#define __MININT__(T) (-__MAXINT__(T))

#else

#error "do not know the integer encoding on this architecture"

#endif

#ifndef INT8_MAX
#define INT8_MIN __MININT__(int8_t)
#define INT8_MAX __MAXINT__(int8_t)
#define UINT8_MAX __MAXUINT__(uint8_t)
#endif

#ifndef INT16_MAX
#define INT16_MIN __MININT__(int16_t)
#define INT16_MAX __MAXINT__(int16_t)
#define UINT16_MAX __MAXUINT__(uint16_t)
#endif

#ifndef INT32_MAX
#define INT32_MIN __MININT__(int32_t)
#define INT32_MAX __MAXINT__(int32_t)
#define UINT32_MAX __MAXUINT__(uint32_t)
#endif

#ifndef INT64_MAX
#define INT64_MIN __MININT__(int64_t)
#define INT64_MAX __MAXINT__(int64_t)
#define UINT64_MAX __MAXUINT__(uint64_t)
#endif

#ifndef INT128_MAX
#if defined(__SIZEOF_INT128__) && __SIZEOF_INT128__ == 16
typedef __int128_t int128_t;
typedef __uint128_t uint128_t;
#define INT128_MIN __MININT__(int128_t)
#define INT128_MAX __MAXINT__(int128_t)
#define UINT128_MAX __MAXUINT__(uint128_t)
#endif
#endif

#ifndef SIZE_MAX
#define SIZE_MAX __MAXUINT__(size_t)
#endif

#ifndef OSSL_INTMAX_MAX
#define OSSL_INTMAX_MIN __MININT__(ossl_intmax_t)
#define OSSL_INTMAX_MAX __MAXINT__(ossl_intmax_t)
#define OSSL_UINTMAX_MAX __MAXUINT__(ossl_uintmax_t)
#endif

#endif