src/test/test-sizeof.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2016 Zbigniew Jędrzejewski-Szmek
   6 ***/
   7
   8 #include <stdio.h>
   9 #include <string.h>
  10
  11 #include "time-util.h"
  12
  13 /* Print information about various types. Useful when diagnosing
  14  * gcc diagnostics on an unfamiliar architecture. */
  15
  16 #pragma GCC diagnostic ignored "-Wtype-limits"
  17
  18 #define info(t)                                                 \
  19         printf("%s → %zu bits%s\n", STRINGIFY(t),               \
  20                sizeof(t)*CHAR_BIT,                              \
  21                strstr(STRINGIFY(t), "signed") ? "" :            \
  22                ((t)-1 < (t)0 ? ", signed" : ", unsigned"));
  23
  24 enum Enum {
  25         enum_value,
  26 };
  27
  28 enum BigEnum {
  29         big_enum_value = UINT64_C(1),
  30 };
  31
  32 enum BigEnum2 {
  33         big_enum2_pos = UINT64_C(1),
  34         big_enum2_neg = UINT64_C(-1),
  35 };
  36
  37 int main(void) {
  38         info(char);
  39         info(signed char);
  40         info(unsigned char);
  41         info(short unsigned);
  42         info(unsigned);
  43         info(long unsigned);
  44         info(long long unsigned);
  45         info(__syscall_ulong_t);
  46         info(__syscall_slong_t);
  47
  48         info(float);
  49         info(double);
  50         info(long double);
  51
  52         info(size_t);
  53         info(ssize_t);
  54         info(time_t);
  55         info(usec_t);
  56         info(__time_t);
  57         info(pid_t);
  58         info(uid_t);
  59         info(gid_t);
  60
  61         info(enum Enum);
  62         info(enum BigEnum);
  63         info(enum BigEnum2);
  64         assert_cc(sizeof(enum BigEnum2) == 8);
  65         printf("big_enum2_pos → %zu\n", sizeof(big_enum2_pos));
  66         printf("big_enum2_neg → %zu\n", sizeof(big_enum2_neg));
  67
  68         return 0;
  69 }