1 files changed, 71 insertions, 0 deletions
diff --git a/lib/debug.c b/lib/debug.c
new file mode 100644
index 0000000..1b75e63
--- /dev/null
+++ b/lib/debug.c
@@ -0,0 +1,71 @@
+/*
+ * debug.c: debugging messages
+ * Copyright (C) 2007 Colin Watson.
+ *
+ * This file is part of man-db.
+ *
+ * man-db is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * man-db is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with man-db; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+
+#include "manconfig.h"
+
+int debug_level = 0;
+
+void init_debug (void)
+{
+	const char *man_debug = getenv ("MAN_DEBUG");
+	if (man_debug && STREQ (man_debug, "1"))
+		debug_level = 1;
+}
+
+static void vdebug (const char *message, va_list args)
+{
+	if (debug_level)
+		vfprintf (stderr, message, args);
+}
+
+void debug (const char *message, ...)
+{
+	if (debug_level) {
+		va_list args;
+
+		va_start (args, message);
+		vdebug (message, args);
+		va_end (args);
+	}
+}
+
+void debug_error (const char *message, ...)
+{
+	if (debug_level) {
+		va_list args;
+
+		va_start (args, message);
+		vdebug (message, args);
+		va_end (args);
+
+		debug (": %s\n", strerror (errno));
+	}
+}