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UDI_FIRST_ELEMENT, UDI_LAST_ELEMENT, UDI_NEXT_ELEMENT, UDI_PREV_ELEMENT
Get first/last/next/previous element in queue
#include <udi.h>#define UDI_FIRST_ELEMENT(listhead) \ ((listhead)->next) #define UDI_LAST_ELEMENT(listhead) \ ((listhead)->prev) #define UDI_NEXT_ELEMENT(element) \ ((element)->next) #define UDI_PREV_ELEMENT(element) \ ((element)->prev)ARGUMENTS listhead is a pointer to a list head element.
element is a pointer to a queue element.
DESCRIPTION UDI_FIRST_ELEMENT returns a pointer to the first element in the queue specified by listhead.
UDI_LAST_ELEMENT returns a pointer to the last element in the queue specified by listhead.
UDI_NEXT_ELEMENT returns a pointer to the next queue element immediately after element.
UDI_PREV_ELEMENT returns a pointer to the queue element immediately preceding element.
These macros must be called as if they, respectively, had the following functional interface:
udi_queue_t *UDI_FIRST_ELEMENT ( udi_queue_t *listhead ); udi_queue_t *UDI_LAST_ELEMENT ( udi_queue_t *listhead ); udi_queue_t *UDI_NEXT_ELEMENT ( udi_queue_t *element ); udi_queue_t *UDI_PREV_ELEMENT ( udi_queue_t *element );