33 lines
544 B
C
33 lines
544 B
C
#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "dataq.h"
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#define QLINK(q,x) (*((void **)(((char *) x) + (q)->link_offset)))
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void enqueue(queue_t *q, void *x) {
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QLINK(q, x) = NULL;
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if (q->head == NULL) {
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q->head = x;
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} else {
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QLINK(q, q->tail) = x;
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}
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q->tail = x;
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q->count++;
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}
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void *dequeue(queue_t *q) {
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if (q->head == NULL) {
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return NULL;
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} else {
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void *x = q->head;
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q->head = QLINK(q, x);
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if (q->head == NULL) {
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q->tail = NULL;
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}
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q->count--;
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return x;
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}
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}
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