src/test/test-sizeof.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 #include "time-util.h"
   7
   8 /* Print information about various types. Useful when diagnosing
   9  * gcc diagnostics on an unfamiliar architecture. */
  10
  11 #pragma GCC diagnostic ignored "-Wtype-limits"
  12
  13 #define info(t)                                                 \
  14         printf("%s → %zu bits%s\n", STRINGIFY(t),               \
  15                sizeof(t)*CHAR_BIT,                              \
  16                strstr(STRINGIFY(t), "signed") ? "" :            \
  17                ((t)-1 < (t)0 ? ", signed" : ", unsigned"));
  18
  19 enum Enum {
  20         enum_value,
  21 };
  22
  23 enum BigEnum {
  24         big_enum_value = UINT64_C(1),
  25 };
  26
  27 enum BigEnum2 {
  28         big_enum2_pos = UINT64_C(1),
  29         big_enum2_neg = UINT64_C(-1),
  30 };
  31
  32 int main(void) {
  33         info(char);
  34         info(signed char);
  35         info(unsigned char);
  36         info(short unsigned);
  37         info(unsigned);
  38         info(long unsigned);
  39         info(long long unsigned);
  40 #ifdef __GLIBC__
  41         info(__syscall_ulong_t);
  42         info(__syscall_slong_t);
  43 #endif // ifdef __GLIBC__
  44
  45         info(float);
  46         info(double);
  47         info(long double);
  48
  49 #ifdef __HAVE_DISTINCT_FLOAT128X
  50         info(_Float128);
  51         info(_Float64);
  52         info(_Float64x);
  53         info(_Float32);
  54         info(_Float32x);
  55 #endif
  56
  57         info(size_t);
  58         info(ssize_t);
  59         info(time_t);
  60         info(usec_t);
  61 #ifdef __GLIBC__
  62         info(__time_t);
  63 #endif // ifdef __GLIBC__
  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 }