tdb: import unit tests from CCAN into tdb/test/

I pulled tdb into CCAN as an experiment a while ago; it doesn't belong
there, but it has accumulated some important unit tests.

These are copied from CCAN version init-1486-gc438ec1 with #include "../"
changed to #include "../common/".

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 33 insertions, 0 deletions

diff --git a/lib/tdb/test/logging.c b/lib/tdb/test/logging.c
new file mode 100644
index 0000000000..ae598a9845
--- /dev/null
+++ b/lib/tdb/test/logging.c
@@ -0,0 +1,33 @@
+#include "logging.h"
+#include <ccan/tap/tap.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+bool suppress_logging = false;
+const char *log_prefix = "";
+
+/* Turn log messages into tap diag messages. */
+static void taplog(struct tdb_context *tdb,
+		   enum tdb_debug_level level,
+		   const char *fmt, ...)
+{
+	va_list ap;
+	char line[200];
+
+	if (suppress_logging)
+		return;
+
+	va_start(ap, fmt);
+	vsprintf(line, fmt, ap);
+	va_end(ap);
+
+	/* Strip trailing \n: diag adds it. */
+	if (line[0] && line[strlen(line)-1] == '\n')
+		diag("%s%.*s", log_prefix, (unsigned)strlen(line)-1, line);
+	else
+		diag("%s%s", log_prefix, line);
+}
+
+struct tdb_logging_context taplogctx = { taplog, NULL };