Append a formatted string to the end of an evbuffer.
The string is formated as printf.
@param buf the evbuffer that will be appended to
@param fmt a format string
@param ... arguments that will be passed to printf(3)
@return The number of bytes added if successful, or -1 if an error occurred.
Append a formatted string to the end of an evbuffer.
The string is formated as printf.
@param buf the evbuffer that will be appended to @param fmt a format string @param ... arguments that will be passed to printf(3) @return The number of bytes added if successful, or -1 if an error occurred.
@see evutil_printf(), evbuffer_add_vprintf()