src/test/test-sizeof.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 #define __STDC_WANT_IEC_60559_TYPES_EXT__
   7 #include <float.h>
   8
   9 #include "time-util.h"
  10
  11 /* Print information about various types. Useful when diagnosing
  12  * gcc diagnostics on an unfamiliar architecture. */
  13
  14 #pragma GCC diagnostic ignored "-Wtype-limits"
  15
  16 #define info(t)                                                         \
  17         printf("%s → %zu bits%s, %zu byte alignment\n", STRINGIFY(t),   \
  18                sizeof(t)*CHAR_BIT,                                      \
  19                strstr(STRINGIFY(t), "signed") ? "" :                    \
  20                (t)-1 < (t)0 ? ", signed" : ", unsigned",                \
  21                __alignof__(t))
  22
  23 enum Enum {
  24         enum_value,
  25 };
  26
  27 enum BigEnum {
  28         big_enum_value = UINT64_C(1),
  29 };
  30
  31 enum BigEnum2 {
  32         big_enum2_pos = UINT64_C(1),
  33         big_enum2_neg = UINT64_C(-1),
  34 };
  35
  36 int main(void) {
  37         info(char);
  38         info(signed char);
  39         info(unsigned char);
  40         info(short unsigned);
  41         info(unsigned);
  42         info(long unsigned);
  43         info(long long unsigned);
  44         info(__syscall_ulong_t);
  45         info(__syscall_slong_t);
  46
  47         info(float);
  48         info(double);
  49         info(long double);
  50
  51 #ifdef FLT128_MAX
  52         info(_Float128);
  53         info(_Float64);
  54         info(_Float64x);
  55         info(_Float32);
  56         info(_Float32x);
  57 #endif
  58
  59         info(size_t);
  60         info(ssize_t);
  61         info(time_t);
  62         info(usec_t);
  63         info(__time_t);
  64         info(pid_t);
  65         info(uid_t);
  66         info(gid_t);
  67
  68         info(enum Enum);
  69         info(enum BigEnum);
  70         info(enum BigEnum2);
  71         assert_cc(sizeof(enum BigEnum2) == 8);
  72         printf("big_enum2_pos → %zu\n", sizeof(big_enum2_pos));
  73         printf("big_enum2_neg → %zu\n", sizeof(big_enum2_neg));
  74
  75         return 0;
  76 }