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67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
#pragma once
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/* Implementation from BSD headers*/
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#define QMD_SAVELINK(name, link) void **name = (void *)&(link)
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#define TRASHIT(x) do {(x) = (void *)-1;} while (0)
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#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
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#define STAILQ_FIRST(head) ((head)->stqh_first)
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#define STAILQ_HEAD(name, type) \
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struct name { \
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struct type *stqh_first;/* first element */ \
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struct type **stqh_last;/* addr of last next element */ \
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}
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#define STAILQ_ENTRY(type) \
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struct { \
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struct type *stqe_next; /* next element */ \
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}
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#define STAILQ_INSERT_TAIL(head, elm, field) do { \
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STAILQ_NEXT((elm), field) = NULL; \
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*(head)->stqh_last = (elm); \
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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} while (0)
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#define STAILQ_INIT(head) do { \
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STAILQ_FIRST((head)) = NULL; \
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(head)->stqh_last = &STAILQ_FIRST((head)); \
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} while (0)
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#define STAILQ_FOREACH(var, head, field) \
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for((var) = STAILQ_FIRST((head)); \
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(var); \
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(var) = STAILQ_NEXT((var), field))
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#define STAILQ_FOREACH_SAFE(var, head, field, tvar) \
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for ((var) = STAILQ_FIRST((head)); \
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(var) && ((tvar) = STAILQ_NEXT((var), field), 1); \
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(var) = (tvar))
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#define STAILQ_REMOVE_AFTER(head, elm, field) do { \
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if ((STAILQ_NEXT(elm, field) = \
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STAILQ_NEXT(STAILQ_NEXT(elm, field), field)) == NULL) \
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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} while (0)
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#define STAILQ_REMOVE_HEAD(head, field) do { \
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if ((STAILQ_FIRST((head)) = \
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STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL) \
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(head)->stqh_last = &STAILQ_FIRST((head)); \
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} while (0)
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#define STAILQ_REMOVE(head, elm, type, field) do { \
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QMD_SAVELINK(oldnext, (elm)->field.stqe_next); \
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if (STAILQ_FIRST((head)) == (elm)) { \
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STAILQ_REMOVE_HEAD((head), field); \
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} \
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else { \
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struct type *curelm = STAILQ_FIRST((head)); \
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while (STAILQ_NEXT(curelm, field) != (elm)) \
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curelm = STAILQ_NEXT(curelm, field); \
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STAILQ_REMOVE_AFTER(head, curelm, field); \
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} \
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TRASHIT(*oldnext); \
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} while (0)
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