ABI compatibility test for asound.h in regards of snd_pcm_mmap_control

dump-offset-and-size.c

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>

#include <stdint.h>

#define __user
#include "path-to-include/uapi/sound/asound.h"

#if defined(PREVIOUS)

// Previous definition.
struct pcm_mmap_control {
	snd_pcm_uframes_t appl_ptr;
	snd_pcm_uframes_t avail_min;
};
#define offset(field)	(offsetof(struct pcm_mmap_control, field))
#define size(field)	(sizeof(data.field))

#else

#define offset(field)	(offsetof(struct __snd_pcm_mmap_control64, field))
#define size(field)	(sizeof(data.field))

#endif


int main(int argc, const char *argv[])
{
	struct __snd_pcm_mmap_control64 data;

#ifndef PREVIOUS
	printf("__pad1:    %zu, %zu\n", offset(__pad1), size(__pad1));
#endif

	printf("appl_ptr:  %zu, %zu\n", offset(appl_ptr), size(appl_ptr));

#ifndef PREVIOUS
	printf("__pad2:    %zu, %zu\n", offset(__pad2), size(__pad2));
	printf("__pad3:    %zu, %zu\n", offset(__pad3), size(__pad3));
#endif

	printf("avail_min: %zu, %zu\n", offset(avail_min), size(avail_min));

#ifndef PREVIOUS
	printf("__pad4:    %zu, %zu\n", offset(__pad4), size(__pad4));
#endif

	return EXIT_SUCCESS;
}