asn1p_list.h

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#include <stddef.h>

/*
* Singly linked tail queue support.
*/
#ifndef	ASN1_PARSER_LIST_C_H
#define	ASN1_PARSER_LIST_C_H

typedef struct tq_head_s
{
	void *tq_head;
	void **tq_tail;
}tq_head_t;

typedef struct tq_entry_s
{
	void *tq_next;
}tq_entry_t;

#define	TQ_HEAD(type) \
struct {					\
	type *tq_head;				\
	type**tq_tail;				\
}

typedef TQ_HEAD(void) tq_void_head_t;

#define	TQ_MOVE(to, from)	do {			\
	if(&(TQ_FIRST(from)) == (from)->tq_tail) {	\
	TQ_INIT(to);				\
	} else {					\
	(to)->tq_head = (from)->tq_head;	\
	(to)->tq_tail = (from)->tq_tail;	\
	}						\
	TQ_INIT(from);					\
} while(0)

#define	TQ_ENTRY(type)	\
struct {					\
	type *tq_next;				\
}

typedef TQ_ENTRY(void) tq_void_entry_t;

#define TQ_FIRST(headp)		((headp)->tq_head)
#define TQ_NEXT(el, field)	((el)->field.tq_next)

#define TQ_INIT(head) do {				\
	TQ_FIRST((head)) = 0;				\
	(head)->tq_tail = &TQ_FIRST((head));		\
} while(0)

#define	TQ_FOR(var, head, field)			\
	for((var) = TQ_FIRST((head));			\
	(var); (var) = TQ_NEXT((var), field))

/* MSVC does not have typeof(), cannot prevent side effects! */
#define	TQ_ADD(head, xel, field) do {			\
	typeof(xel) __el = (xel);			\
	assert(TQ_NEXT((__el), field) == 0);		\
	*(head)->tq_tail = (__el);			\
	(head)->tq_tail = &TQ_NEXT((__el), field);	\
} while(0)


#define	TQ_ADD_TYPE(_type,head, xel, field) do {			\
	_type *__el = (xel);			\
	assert(TQ_NEXT((__el), field) == 0);		\
	*(head)->tq_tail = (__el);			\
	(head)->tq_tail = &TQ_NEXT((__el), field);	\
} while(0)

/*
* Remove the first element and return it.
*/
#define	TQ_REMOVE(head, field)	({			\
	typeof(TQ_FIRST((head))) __fel;			\
	__fel = TQ_FIRST((head));			\
	if(__fel == 0					\
	|| (TQ_FIRST((head)) = TQ_NEXT(__fel, field))	\
	== 0) {					\
	(head)->tq_tail = &TQ_FIRST((head));	\
} else {					\
	TQ_NEXT(__fel, field) = 0;		\
}						\
	__fel; })

#define TQ_REMOVE_TYPE(_type,head,field) ((_type*) \
	asn1p_list_remove( (tq_void_head_t*)(head),offsetof(_type,field) ))

void* asn1p_list_remove(tq_void_head_t* head,size_t offset);

#endif	/* ASN1_PARSER_LIST_H */