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/* Licensed under LGPLv2.1+ - see LICENSE file for details */
#include <stdio.h>
#include <stdlib.h>
#include "list.h"
static void *corrupt(const char *abortstr,
const struct ccan_list_node *head,
const struct ccan_list_node *node,
unsigned int count)
{
if (abortstr) {
fprintf(stderr,
"%s: prev corrupt in node %p (%u) of %p\n",
abortstr, node, count, head);
abort();
}
return NULL;
}
struct ccan_list_node *ccan_list_check_node(const struct ccan_list_node *node,
const char *abortstr)
{
const struct ccan_list_node *p, *n;
int count = 0;
for (p = node, n = node->next; n != node; p = n, n = n->next) {
count++;
if (n->prev != p)
return corrupt(abortstr, node, n, count);
}
/* Check prev on head node. */
if (node->prev != p)
return corrupt(abortstr, node, node, 0);
return (struct ccan_list_node *)node;
}
struct ccan_list_head *ccan_list_check(const struct ccan_list_head *h, const char *abortstr)
{
if (!ccan_list_check_node(&h->n, abortstr))
return NULL;
return (struct ccan_list_head *)h;
}
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