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 #include <sys/types.h>
   7 #include <sys/socket.h>
   8
   9 #define __STDC_WANT_IEC_60559_TYPES_EXT__
  10 #include <float.h>
  11
  12 #include "time-util.h"
  13
  14 /* Print information about various types. Useful when diagnosing
  15  * gcc diagnostics on an unfamiliar architecture. */
  16
  17 #pragma GCC diagnostic ignored "-Wtype-limits"
  18
  19 #define info(t)                                                         \
  20         printf("%s → %zu bits%s, %zu byte alignment\n", STRINGIFY(t),   \
  21                sizeof(t)*CHAR_BIT,                                      \
  22                strstr(STRINGIFY(t), "signed") ? "" :                    \
  23                (t)-1 < (t)0 ? ", signed" : ", unsigned",                \
  24                __alignof__(t))
  25
  26 enum Enum {
  27         enum_value,
  28 };
  29
  30 enum BigEnum {
  31         big_enum_value = UINT64_C(1),
  32 };
  33
  34 enum BigEnum2 {
  35         big_enum2_pos = UINT64_C(1),
  36         big_enum2_neg = UINT64_C(-1),
  37 };
  38
  39 int main(void) {
  40         info(char);
  41         info(signed char);
  42         info(unsigned char);
  43         info(short unsigned);
  44         info(unsigned);
  45         info(long unsigned);
  46         info(long long unsigned);
  47         info(__syscall_ulong_t);
  48         info(__syscall_slong_t);
  49
  50         info(float);
  51         info(double);
  52         info(long double);
  53
  54 #ifdef FLT128_MAX
  55         info(_Float128);
  56         info(_Float64);
  57         info(_Float64x);
  58         info(_Float32);
  59         info(_Float32x);
  60 #endif
  61
  62         info(size_t);
  63         info(ssize_t);
  64         info(time_t);
  65         info(usec_t);
  66         info(__time_t);
  67         info(pid_t);
  68         info(uid_t);
  69         info(gid_t);
  70         info(socklen_t);
  71
  72         info(__cpu_mask);
  73
  74         info(enum Enum);
  75         info(enum BigEnum);
  76         info(enum BigEnum2);
  77         assert_cc(sizeof(enum BigEnum2) == 8);
  78         printf("big_enum2_pos → %zu\n", sizeof(big_enum2_pos));
  79         printf("big_enum2_neg → %zu\n", sizeof(big_enum2_neg));
  80
  81         return 0;
  82 }