#define FILL_METADATA_INT(s, key) { \
char number[10]; \
snprintf(number, sizeof(number), "%d", s->key); \
if(s->key) FILL_METADATA(s, key, number) }
#define FILL_METADATA_INT(s, key) { \
char number[10]; \
snprintf(number, sizeof(number), "%d", s->key); \
if(s->key) FILL_METADATA(s, key, number) }