libcommon: add common debugging routines

Signed-off-by: Ondrej Oprala <ooprala@redhat.com>

1 files changed, 70 insertions, 0 deletions

diff --git a/include/debug.h b/include/debug.h
new file mode 100644
index 000000000..51d09b84d
--- /dev/null
+++ b/include/debug.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2014 Ondrej Oprala <ooprala@redhat.com>
+ *
+ * This file may be distributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#ifndef UTIL_LINUX_DEBUG_H
+#define UTIL_LINUX_DEBUG_H
+
+#define _UL_DEBUG
+#ifdef _UL_DEBUG
+
+#include <stdarg.h>
+
+# define __UL_DBG(l, p, m, x) \
+			do { \
+				if ((p ## m) & l ## _debug_mask) { \
+					fprintf(stderr, "%d: %s: %8s: ", getpid(), # l, # m); \
+					x; \
+				} \
+			} while (0)
+
+#define __UL_INIT_DEBUG(lib, pref, mask, env) do { \
+	if (lib ## _debug_mask & pref ## INIT) \
+	; \
+	else if (!mask) { \
+		char *str = getenv(# env); \
+		if (str) \
+			lib ## _debug_mask = strtoul(str, 0, 0); \
+	} else \
+		lib ## _debug_mask = mask; \
+	lib ## _debug_mask |= pref ## INIT; \
+	if (lib ## _debug_mask != pref ## INIT) { \
+		const char *ver = NULL; \
+		__UL_DBG(lib, pref, INIT, ul_debug("library debug mask: 0x%04x", \
+				lib ## _debug_mask)); \
+		/* ul_get_library_version(&ver); \
+		__UL_DBG(lib, pref, INIT, ul_debug("library version: %s", ver));*/ \
+	} \
+} while (0)
+
+static inline void __attribute__ ((__format__ (__printf__, 1, 2)))
+ul_debug(const char *mesg, ...)
+{
+	va_list ap;
+	va_start(ap, mesg);
+	vfprintf(stderr, mesg, ap);
+	va_end(ap);
+	fputc('\n', stderr);
+}
+
+static inline void __attribute__ ((__format__ (__printf__, 2, 3)))
+ul_debugobj(void *handler, const char *mesg, ...)
+{
+	va_list ap;
+
+	if (handler)
+		fprintf(stderr, "[%p]: ", handler);
+	va_start(ap, mesg);
+	vfprintf(stderr, mesg, ap);
+	va_end(ap);
+	fputc('\n', stderr);
+}
+
+#else /* !_UL_DEBUG */
+# define __UL_DBG(l, p, m, x) do { ; } while (0)
+#define __UL_INIT_DEBUG(lib, pref, mask, env) do { ; } while (0)
+#endif
+
+#endif /* UTIL_LINUX_DEBUG_H */