Man page 9 : usb_descriptor_fillbuf

usb_descriptor_fillbuf - fill buffer with descriptors

int usb_descriptor_fillbuf(void *  buf , unsigned  buflen , const struct usb_descriptor_header **  src );

buf
    Buffer to be filled

buflen
    Size of buf

src
    Array of descriptor pointers, terminated by null pointer.

Copies descriptors into the buffer, returning the length or a negative error code if they canAqt all be copied. Useful when assembling descriptors for an associated set of interfaces used as part of configuring a composite device; or in other cases where sets of descriptors need to be marshaled.

David Brownell <>
    Author.