#define AVUTIL_AVSTRING_H
#include <stddef.h>
+#include "attributes.h"
/**
* Return non-zero if pfx is a prefix of str. If it is, *ptr is set to
* @return the length of the string that would have been generated
* if enough space had been available
*/
-size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...);
+size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...) av_printf_format(3, 4);
/**
* Convert a number to a av_malloced string.