/*

 * debug.c: debugging messages

 * Copyright (C) 2007, 2010 Colin Watson.

 *

 * This file is part of libpipeline.

 *

 * libpipeline 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.

 *

 * libpipeline 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 libpipeline; 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 "pipeline-private.h"

int debug_level = 0;

void init_debug (void)

{

	static int inited = 0;

	const char *pipeline_debug;

	if (inited)

		return;

	inited = 1;

	pipeline_debug = getenv ("PIPELINE_DEBUG");

	if (pipeline_debug && !strcmp (pipeline_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, ...)

{

	init_debug ();

	if (debug_level) {

		va_list args;

		va_start (args, message);

		vdebug (message, args);

		va_end (args);

	}

}