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\n", STRINGIFY(t),               \
  18                sizeof(t)*CHAR_BIT,                              \
  19                strstr(STRINGIFY(t), "signed") ? "" :            \
  20                ((t)-1 < (t)0 ? ", signed" : ", unsigned"));
  21
  22 enum Enum {
  23         enum_value,
  24 };
  25
  26 enum BigEnum {
  27         big_enum_value = UINT64_C(1),
  28 };
  29
  30 enum BigEnum2 {
  31         big_enum2_pos = UINT64_C(1),
  32         big_enum2_neg = UINT64_C(-1),
  33 };
  34
  35 int main(void) {
  36         info(char);
  37         info(signed char);
  38         info(unsigned char);
  39         info(short unsigned);
  40         info(unsigned);
  41         info(long unsigned);
  42         info(long long unsigned);
  43         info(__syscall_ulong_t);
  44         info(__syscall_slong_t);
  45
  46         info(float);
  47         info(double);
  48         info(long double);
  49
  50 #ifdef FLT128_MAX
  51         info(_Float128);
  52         info(_Float64);
  53         info(_Float64x);
  54         info(_Float32);
  55         info(_Float32x);
  56 #endif
  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(uid_t);
  65         info(gid_t);
  66
  67         info(enum Enum);
  68         info(enum BigEnum);
  69         info(enum BigEnum2);
  70         assert_cc(sizeof(enum BigEnum2) == 8);
  71         printf("big_enum2_pos → %zu\n", sizeof(big_enum2_pos));
  72         printf("big_enum2_neg → %zu\n", sizeof(big_enum2_neg));
  73
  74         return 0;
  75 }