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-rw-r--r--src/test/test-sizeof.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/src/test/test-sizeof.c b/src/test/test-sizeof.c
new file mode 100644
index 0000000..a4b4189
--- /dev/null
+++ b/src/test/test-sizeof.c
@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <sched.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/timex.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#define __STDC_WANT_IEC_60559_TYPES_EXT__
+#include <float.h>
+
+#include "time-util.h"
+
+/* Print information about various types. Useful when diagnosing
+ * gcc diagnostics on an unfamiliar architecture. */
+
+DISABLE_WARNING_TYPE_LIMITS;
+
+#define info_no_sign(t) \
+ printf("%s → %zu bits, %zu byte alignment\n", STRINGIFY(t), \
+ sizeof(t)*CHAR_BIT, \
+ __alignof__(t))
+
+#define info(t) \
+ printf("%s → %zu bits%s, %zu byte alignment\n", STRINGIFY(t), \
+ sizeof(t)*CHAR_BIT, \
+ strstr(STRINGIFY(t), "signed") ? "" : \
+ (t)-1 < (t)0 ? ", signed" : ", unsigned", \
+ __alignof__(t))
+
+enum Enum {
+ enum_value,
+};
+
+enum BigEnum {
+ big_enum_value = UINT64_C(1),
+};
+
+enum BigEnum2 {
+ big_enum2_pos = UINT64_C(1),
+ big_enum2_neg = UINT64_C(-1),
+};
+
+int main(void) {
+ int (*function_pointer)(void);
+
+ info_no_sign(function_pointer);
+ info_no_sign(void*);
+ info(char*);
+
+ info(char);
+ info(signed char);
+ info(unsigned char);
+ info(short unsigned);
+ info(unsigned);
+ info(unsigned long);
+ info(unsigned long long);
+#ifdef __GLIBC__
+ info(__syscall_ulong_t);
+ info(__syscall_slong_t);
+#endif
+ info(intmax_t);
+ info(uintmax_t);
+
+ info(float);
+ info(double);
+ info(long double);
+
+#ifdef FLT128_MAX
+ info(_Float128);
+ info(_Float64);
+ info(_Float64x);
+ info(_Float32);
+ info(_Float32x);
+#endif
+
+ info(size_t);
+ info(ssize_t);
+ info(time_t);
+ info(usec_t);
+#ifdef __GLIBC__
+ info(__time_t);
+#endif
+ info(pid_t);
+ info(uid_t);
+ info(gid_t);
+ info(socklen_t);
+
+#ifdef __GLIBC__
+ info(__cpu_mask);
+#endif
+
+ info(enum Enum);
+ info(enum BigEnum);
+ info(enum BigEnum2);
+ assert_cc(sizeof(enum BigEnum2) == 8);
+ printf("big_enum2_pos → %zu\n", sizeof(big_enum2_pos));
+ printf("big_enum2_neg → %zu\n", sizeof(big_enum2_neg));
+
+ printf("timeval: %zu\n", sizeof(struct timeval));
+ printf("timespec: %zu\n", sizeof(struct timespec));
+
+ void *x = malloc(100);
+
+ printf("local variable: %p\n", &function_pointer);
+ printf("glibc function: %p\n", memcpy);
+ printf("heap allocation: %p\n", x);
+ free(x);
+
+ return 0;
+}