include/internal/numbers.h

   1 /*
   2  * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifndef HEADER_NUMBERS_H
  11 # define HEADER_NUMBERS_H
  12
  13 # include <limits.h>
  14
  15 # if (-1 & 3) == 0x03           /* Two's complement */
  16
  17 #  define __MAXUINT__(T) ((T) -1)
  18 #  define __MAXINT__(T) ((T) ((((T) 1) << ((sizeof(T) * CHAR_BIT) - 1)) ^ __MAXUINT__(T)))
  19 #  define __MININT__(T) (-__MAXINT__(T) - 1)
  20
  21 # elif (-1 & 3) == 0x02         /* One's complement */
  22
  23 #  define __MAXUINT__(T) (((T) -1) + 1)
  24 #  define __MAXINT__(T) ((T) ((((T) 1) << ((sizeof(T) * CHAR_BIT) - 1)) ^ __MAXUINT__(T)))
  25 #  define __MININT__(T) (-__MAXINT__(T))
  26
  27 # elif (-1 & 3) == 0x01         /* Sign/magnitude */
  28
  29 #  define __MAXINT__(T) ((T) (((((T) 1) << ((sizeof(T) * CHAR_BIT) - 2)) - 1) | (((T) 1) << ((sizeof(T) * CHAR_BIT) - 2))))
  30 #  define __MAXUINT__(T) ((T) (__MAXINT__(T) | (((T) 1) << ((sizeof(T) * CHAR_BIT) - 1))))
  31 #  define __MININT__(T) (-__MAXINT__(T))
  32
  33 # else
  34
  35 #  error "do not know the integer encoding on this architecture"
  36
  37 # endif
  38
  39 # ifndef INT8_MAX
  40 #  define INT8_MIN __MININT__(int8_t)
  41 #  define INT8_MAX __MAXINT__(int8_t)
  42 #  define UINT8_MAX __MAXUINT__(uint8_t)
  43 # endif
  44
  45 # ifndef INT16_MAX
  46 #  define INT16_MIN __MININT__(int16_t)
  47 #  define INT16_MAX __MAXINT__(int16_t)
  48 #  define UINT16_MAX __MAXUINT__(uint16_t)
  49 # endif
  50
  51 # ifndef INT32_MAX
  52 #  define INT32_MIN __MININT__(int32_t)
  53 #  define INT32_MAX __MAXINT__(int32_t)
  54 #  define UINT32_MAX __MAXUINT__(uint32_t)
  55 # endif
  56
  57 # ifndef INT64_MAX
  58 #  define INT64_MIN __MININT__(int64_t)
  59 #  define INT64_MAX __MAXINT__(int64_t)
  60 #  define UINT64_MAX __MAXUINT__(uint64_t)
  61 # endif
  62
  63 # ifndef SIZE_MAX
  64 #  define SIZE_MAX __MAXUINT__(size_t)
  65 # endif
  66
  67 #endif
  68