src/test/test-sizeof.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2016 Zbigniew Jędrzejewski-Szmek
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stdio.h>
  21
  22 #include "time-util.h"
  23
  24 /* Print information about various types. Useful when diagnosing
  25  * gcc diagnostics on an unfamiliar architecture. */
  26
  27 #pragma GCC diagnostic ignored "-Wtype-limits"
  28
  29 #define info(t)                                                 \
  30         printf("%s → %zu bits%s\n", STRINGIFY(t),               \
  31                sizeof(t)*CHAR_BIT,                              \
  32                strstr(STRINGIFY(t), "signed") ? "" :            \
  33                ((t)-1 < (t)0 ? ", signed" : ", unsigned"));
  34
  35 enum Enum {
  36         enum_value,
  37 };
  38
  39 enum BigEnum {
  40         big_enum_value = UINT64_C(-1),
  41 };
  42
  43 int main(void) {
  44         info(char);
  45         info(signed char);
  46         info(unsigned char);
  47         info(short unsigned);
  48         info(unsigned);
  49         info(long unsigned);
  50         info(long long unsigned);
  51         info(__syscall_ulong_t);
  52         info(__syscall_slong_t);
  53
  54         info(float);
  55         info(double);
  56         info(long double);
  57
  58         info(size_t);
  59         info(ssize_t);
  60         info(time_t);
  61         info(usec_t);
  62         info(__time_t);
  63         info(pid_t);
  64         info(gid_t);
  65
  66         info(enum Enum);
  67         info(enum BigEnum);
  68
  69         return 0;
  70 }