+/* Check that CCAN_LIST_DEBUG works */
+#include <setjmp.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <err.h>
+
+/* We don't actually want it to exit... */
+static jmp_buf aborted;
+#define abort() longjmp(aborted, 1)
+
+#define fprintf my_fprintf
+static char printf_buffer[1000];
+
+static int my_fprintf(FILE *stream, const char *format, ...)
+{
+ va_list ap;
+ int ret;
+ va_start(ap, format);
+ ret = vsprintf(printf_buffer, format, ap);
+ va_end(ap);
+ return ret;
+}
+
+#define CCAN_LIST_DEBUG 1
+#include <ccan/list/list.h>
+#include <ccan/tap/tap.h>
+#include <ccan/list/list.c>
+
+int main(int argc, char *argv[])
+{
+ struct list_head list;
+ struct list_node n1;
+ char expect[100];
+
+ plan_tests(2);
+ /* Empty list. */
+ list.n.next = &list.n;
+ list.n.prev = &list.n;
+ ok1(list_check(&list, NULL) == &list);
+
+ /* Bad back ptr */
+ list.n.prev = &n1;
+
+ /* Aborting version. */
+ sprintf(expect, "run-CCAN_LIST_DEBUG.c:50: prev corrupt in node %p (0) of %p\n",
+ &list, &list);
+ if (setjmp(aborted) == 0) {
+ assert(list_empty(&list));
+ fail("list_empty on empty with bad back ptr didn't fail!");
+ } else {
+ /* __FILE__ might give full path. */
+ int prep = strlen(printf_buffer) - strlen(expect);
+ ok1(prep >= 0 && strcmp(printf_buffer + prep, expect) == 0);
+ }
+
+ return exit_status();
+}