rsync/mkrounding.c

#include "rsync.h"

struct test1 {
    union file_extras extras1[1];
    struct {
#	include "mkrounding.h"
    } file;
};

struct test2 {
    union file_extras extras2[2];
    struct {
#	include "mkrounding.h"
    } file;
};

struct test4 {
    union file_extras extras4[4];
    struct {
#	include "mkrounding.h"
    } file;
};

#define SIZE_TEST(n) (sizeof (struct test ## n) == EXTRA_LEN * n + sizeof (struct file_struct))

 int main(UNUSED(int argc), UNUSED(char *argv[]))
{
    int cnt;
    if (SIZE_TEST(1))
	cnt = 0;
    else if (SIZE_TEST(2))
	cnt = 1;
    else if (SIZE_TEST(4))
	cnt = 3;
    else {
	fprintf(stderr, "Unable to determine required file_extras rounding!\n");
	cnt = 3;
    }
    if (cnt)
	fprintf(stderr, "Rounding file_extras in multiples of %d", cnt + 1);
    else
	fprintf(stderr, "No rounding needed for file_extras");
    fprintf(stderr, " (EXTRA_LEN=%d, FILE_STRUCT_LEN=%d)\n",
	    (int)EXTRA_LEN, (int)FILE_STRUCT_LEN);
    printf("#define EXTRA_ROUNDING %d\n", cnt);
    return 0;
}