stdlib/tst-width.c

   1 /* Test integer width macros.
   2    Copyright (C) 2016-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <limits.h>
  20 #include <stdio.h>
  21
  22 #define CHECK_WIDTH(TYPE, MAX, WIDTH)                                   \
  23   do                                                                    \
  24     {                                                                   \
  25       if ((MAX >> ((TYPE) -1 < 0 ? (WIDTH - 2) : (WIDTH - 1))) != 1)    \
  26         {                                                               \
  27           puts ("bad width of " #TYPE);                                 \
  28           result = 1;                                                   \
  29         }                                                               \
  30       else                                                              \
  31         puts ("width of " #TYPE " OK");                                 \
  32     }                                                                   \
  33   while (0)
  34
  35 static int
  36 do_test (void)
  37 {
  38   int result = 0;
  39 #ifndef CHAR_WIDTH
  40 # error "missing CHAR_WIDTH"
  41 #endif
  42   CHECK_WIDTH (char, CHAR_MAX, CHAR_WIDTH);
  43 #ifndef SCHAR_WIDTH
  44 # error "missing SCHAR_WIDTH"
  45 #endif
  46   CHECK_WIDTH (signed char, SCHAR_MAX, SCHAR_WIDTH);
  47 #ifndef UCHAR_WIDTH
  48 # error "missing UCHAR_WIDTH"
  49 #endif
  50   CHECK_WIDTH (unsigned char, UCHAR_MAX, UCHAR_WIDTH);
  51 #ifndef SHRT_WIDTH
  52 # error "missing SHRT_WIDTH"
  53 #endif
  54   CHECK_WIDTH (signed short, SHRT_MAX, SHRT_WIDTH);
  55 #ifndef USHRT_WIDTH
  56 # error "missing USHRT_WIDTH"
  57 #endif
  58   CHECK_WIDTH (unsigned short, USHRT_MAX, USHRT_WIDTH);
  59 #ifndef INT_WIDTH
  60 # error "missing INT_WIDTH"
  61 #endif
  62   CHECK_WIDTH (signed int, INT_MAX, INT_WIDTH);
  63 #ifndef UINT_WIDTH
  64 # error "missing UINT_WIDTH"
  65 #endif
  66   CHECK_WIDTH (unsigned int, UINT_MAX, UINT_WIDTH);
  67 #ifndef LONG_WIDTH
  68 # error "missing LONG_WIDTH"
  69 #endif
  70   CHECK_WIDTH (signed long, LONG_MAX, LONG_WIDTH);
  71 #ifndef ULONG_WIDTH
  72 # error "missing ULONG_WIDTH"
  73 #endif
  74   CHECK_WIDTH (unsigned long, ULONG_MAX, ULONG_WIDTH);
  75 #ifndef LLONG_WIDTH
  76 # error "missing LLONG_WIDTH"
  77 #endif
  78   CHECK_WIDTH (signed long long, LLONG_MAX, LLONG_WIDTH);
  79 #ifndef ULLONG_WIDTH
  80 # error "missing ULLONG_WIDTH"
  81 #endif
  82   CHECK_WIDTH (unsigned long long, ULLONG_MAX, ULLONG_WIDTH);
  83   return result;
  84 }
  85
  86 #define TEST_FUNCTION do_test ()
  87 #include "../test-skeleton.c"