ql.h

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/*
 * List definitions.
 */
#define ql_head(a_type) \
struct { \
 a_type *qlh_first; \
}

#define ql_head_initializer(a_head) {NULL}

#define ql_elm(a_type) qr(a_type)

/* List functions. */
#define ql_new(a_head) do { \
 (a_head)->qlh_first = NULL; \
} while (0)

#define ql_elm_new(a_elm, a_field) qr_new((a_elm), a_field)

#define ql_first(a_head) ((a_head)->qlh_first)

#define ql_last(a_head, a_field) \
 ((ql_first(a_head) != NULL) \
 ? qr_prev(ql_first(a_head), a_field) : NULL)

#define ql_next(a_head, a_elm, a_field) \
 ((ql_last(a_head, a_field) != (a_elm)) \
 ? qr_next((a_elm), a_field) : NULL)

#define ql_prev(a_head, a_elm, a_field) \
 ((ql_first(a_head) != (a_elm)) ? qr_prev((a_elm), a_field) \
 : NULL)

#define ql_before_insert(a_head, a_qlelm, a_elm, a_field) do { \
 qr_before_insert((a_qlelm), (a_elm), a_field); \
 if (ql_first(a_head) == (a_qlelm)) { \
 ql_first(a_head) = (a_elm); \
 } \
} while (0)

#define ql_after_insert(a_qlelm, a_elm, a_field) \
 qr_after_insert((a_qlelm), (a_elm), a_field)

#define ql_head_insert(a_head, a_elm, a_field) do { \
 if (ql_first(a_head) != NULL) { \
 qr_before_insert(ql_first(a_head), (a_elm), a_field); \
 } \
 ql_first(a_head) = (a_elm); \
} while (0)

#define ql_tail_insert(a_head, a_elm, a_field) do { \
 if (ql_first(a_head) != NULL) { \
 qr_before_insert(ql_first(a_head), (a_elm), a_field); \
 } \
 ql_first(a_head) = qr_next((a_elm), a_field); \
} while (0)

#define ql_remove(a_head, a_elm, a_field) do { \
 if (ql_first(a_head) == (a_elm)) { \
 ql_first(a_head) = qr_next(ql_first(a_head), a_field); \
 } \
 if (ql_first(a_head) != (a_elm)) { \
 qr_remove((a_elm), a_field); \
 } else { \
 ql_first(a_head) = NULL; \
 } \
} while (0)

#define ql_head_remove(a_head, a_type, a_field) do { \
 a_type *t = ql_first(a_head); \
 ql_remove((a_head), t, a_field); \
} while (0)

#define ql_tail_remove(a_head, a_type, a_field) do { \
 a_type *t = ql_last(a_head, a_field); \
 ql_remove((a_head), t, a_field); \
} while (0)

#define ql_foreach(a_var, a_head, a_field) \
 qr_foreach((a_var), ql_first(a_head), a_field)

#define ql_reverse_foreach(a_var, a_head, a_field) \
 qr_reverse_foreach((a_var), ql_first(a_head), a_field)