kc3-lang/gnulib/tests/test-limits-h.c

• Show log

  Commit

• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

Download

• tests/test-limits-h.c

• /* Test of <limits.h> substitute.
     Copyright 2016-2025 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Paul Eggert.  */
  
  #include <config.h>
  
  #include <limits.h>
  
  #if _GL_GNUC_PREREQ (4, 3)
  # pragma GCC diagnostic ignored "-Woverlength-strings"
  #endif
  
  #define verify_width(width, min, max) \
    static_assert ((max) >> ((width) - 1 - ((min) < 0)) == 1)
  
  /* Macros borrowed from intprops.h.  */
  #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
  #define TYPE_WIDTH(t) (sizeof (t) * CHAR_BIT)
  #define TYPE_MINIMUM(t) ((t) ~ TYPE_MAXIMUM (t))
  #define TYPE_MAXIMUM(t)                                                 \
    ((t) (! TYPE_SIGNED (t)                                               \
          ? (t) -1                                                        \
          : ((((t) 1 << (TYPE_WIDTH (t) - 2)) - 1) * 2 + 1)))
  
  /* Type width macros.  */
  
  int type_bits[] =
    {
      CHAR_BIT,
      WORD_BIT,
      LONG_BIT
    };
  verify_width (CHAR_BIT, CHAR_MIN, CHAR_MAX);
  verify_width (WORD_BIT, INT_MIN, INT_MAX);
  verify_width (LONG_BIT, LONG_MIN, LONG_MAX);
  
  /* Numerical limit macros.  */
  
  char               limits1[]  = { CHAR_MIN, CHAR_MAX };
  static_assert (TYPE_MINIMUM (char) == CHAR_MIN);
  static_assert (TYPE_MAXIMUM (char) == CHAR_MAX);
  
  signed char        limits2[]  = { SCHAR_MIN, SCHAR_MAX };
  static_assert (TYPE_MINIMUM (signed char) == SCHAR_MIN);
  static_assert (TYPE_MAXIMUM (signed char) == SCHAR_MAX);
  
  unsigned char      limits3[]  = { UCHAR_MAX };
  static_assert (TYPE_MINIMUM (unsigned char) == 0);
  static_assert (TYPE_MAXIMUM (unsigned char) == UCHAR_MAX);
  
  short              limits4[]  = { SHRT_MIN, SHRT_MAX };
  static_assert (TYPE_MINIMUM (short int) == SHRT_MIN);
  static_assert (TYPE_MAXIMUM (short int) == SHRT_MAX);
  
  unsigned short     limits5[]  = { USHRT_MAX };
  static_assert (TYPE_MINIMUM (unsigned short int) == 0);
  static_assert (TYPE_MAXIMUM (unsigned short int) == USHRT_MAX);
  
  int                limits6[]  = { INT_MIN, INT_MAX };
  static_assert (TYPE_MINIMUM (int) == INT_MIN);
  static_assert (TYPE_MAXIMUM (int) == INT_MAX);
  
  unsigned int       limits7[]  = { UINT_MAX };
  static_assert (TYPE_MINIMUM (unsigned int) == 0);
  static_assert (TYPE_MAXIMUM (unsigned int) == UINT_MAX);
  
  long               limits8[]  = { LONG_MIN, LONG_MAX };
  static_assert (TYPE_MINIMUM (long int) == LONG_MIN);
  static_assert (TYPE_MAXIMUM (long int) == LONG_MAX);
  
  unsigned long      limits9[]  = { ULONG_MAX };
  static_assert (TYPE_MINIMUM (unsigned long int) == 0);
  static_assert (TYPE_MAXIMUM (unsigned long int) == ULONG_MAX);
  
  long long          limits10[] = { LLONG_MIN, LLONG_MAX };
  static_assert (TYPE_MINIMUM (long long int) == LLONG_MIN);
  static_assert (TYPE_MAXIMUM (long long int) == LLONG_MAX);
  
  unsigned long long limits11[] = { ULLONG_MAX };
  static_assert (TYPE_MINIMUM (unsigned long long int) == 0);
  static_assert (TYPE_MAXIMUM (unsigned long long int) == ULLONG_MAX);
  
  /* Specified by POSIX, not by ISO C.  */
  
  long long limits12[] = { SSIZE_MAX };
  
  /* Macros specified by C23 and by ISO/IEC TS 18661-1:2014.  */
  
  verify_width (CHAR_WIDTH, CHAR_MIN, CHAR_MAX);
  verify_width (SCHAR_WIDTH, SCHAR_MIN, SCHAR_MAX);
  verify_width (UCHAR_WIDTH, 0, UCHAR_MAX);
  verify_width (SHRT_WIDTH, SHRT_MIN, SHRT_MAX);
  verify_width (USHRT_WIDTH, 0, USHRT_MAX);
  verify_width (INT_WIDTH, INT_MIN, INT_MAX);
  verify_width (UINT_WIDTH, 0, UINT_MAX);
  verify_width (LONG_WIDTH, LONG_MIN, LONG_MAX);
  verify_width (ULONG_WIDTH, 0, ULONG_MAX);
  verify_width (LLONG_WIDTH, LLONG_MIN, LLONG_MAX);
  verify_width (ULLONG_WIDTH, 0, ULLONG_MAX);
  
  /* Macros specified by C23.  */
  
  int bool_attrs[] = { BOOL_MAX, BOOL_WIDTH };
  static_assert (BOOL_MAX == 1);
  
  static_assert (0 < MB_LEN_MAX);
  
  /* Get ssize_t, size_t.  */
  #include <sys/types.h>
  
  static_assert (TYPE_MAXIMUM (ssize_t) == SSIZE_MAX);
  /* Verify that ssize_t has the same width as size_t.  */
  static_assert (TYPE_MAXIMUM (size_t) / 2 == SSIZE_MAX);
  
  int
  main (void)
  {
    return 0;
  }
  

Download