src/test/test-sizeof.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <sched.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6
   7 #define __STDC_WANT_IEC_60559_TYPES_EXT__
   8 #include <float.h>
   9
  10 #include "time-util.h"
  11
  12 /* Print information about various types. Useful when diagnosing
  13  * gcc diagnostics on an unfamiliar architecture. */
  14
  15 #pragma GCC diagnostic ignored "-Wtype-limits"
  16
  17 #define info(t)                                                         \
  18         printf("%s → %zu bits%s, %zu byte alignment\n", STRINGIFY(t),   \
  19                sizeof(t)*CHAR_BIT,                                      \
  20                strstr(STRINGIFY(t), "signed") ? "" :                    \
  21                (t)-1 < (t)0 ? ", signed" : ", unsigned",                \
  22                __alignof__(t))
  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 #ifdef FLT128_MAX
  53         info(_Float128);
  54         info(_Float64);
  55         info(_Float64x);
  56         info(_Float32);
  57         info(_Float32x);
  58 #endif
  59
  60         info(size_t);
  61         info(ssize_t);
  62         info(time_t);
  63         info(usec_t);
  64         info(__time_t);
  65         info(pid_t);
  66         info(uid_t);
  67         info(gid_t);
  68
  69         info(__cpu_mask);
  70
  71         info(enum Enum);
  72         info(enum BigEnum);
  73         info(enum BigEnum2);
  74         assert_cc(sizeof(enum BigEnum2) == 8);
  75         printf("big_enum2_pos → %zu\n", sizeof(big_enum2_pos));
  76         printf("big_enum2_neg → %zu\n", sizeof(big_enum2_neg));
  77
  78         return 0;
  79 }