netsurf/utils/log.h

/*
 * Copyright 2003 James Bursa <bursa@users.sourceforge.net>
 * Copyright 2004 John Tytgat <joty@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _NETSURF_LOG_H_
#define _NETSURF_LOG_H_

#include <stdio.h>
#include <stdbool.h>

#include "utils/errors.h"

extern bool verbose_log;

/**
 * Ensures the FILE handle is available to write logging to.
 *
 * This is provided by the frontends if required
 */
typedef bool(nslog_ensure_t)(FILE *fptr);

/**
 * Initialise the logging system.
 *
 * Sets up everything required for logging. Processes the argv passed
 * to remove the -v switch for verbose logging. If necessary ensures
 * the output file handle is available.
 */
extern nserror nslog_init(nslog_ensure_t *ensure, int *pargc, char **argv);

#ifdef NDEBUG
#  define LOG(x) ((void) 0)
#else

/**
 * Obtain a formatted string suitable for prepending to a log message
 *
 * \return formatted string of the time since first log call
 */
extern const char *nslog_gettime(void);
extern void nslog_log(const char *format, ...);

#  ifdef __GNUC__
#    define LOG_FN __PRETTY_FUNCTION__
#    define LOG_LN __LINE__
#  elif defined(__CC_NORCROFT)
#    define LOG_FN __func__
#    define LOG_LN __LINE__
#  else
#    define LOG_FN ""
#    define LOG_LN __LINE__
#  endif

#define LOG(x) \
	do {								\
		if (verbose_log) {					\
			nslog_log("%s " __FILE__ " %s %i: ",		\
				  nslog_gettime(), LOG_FN, LOG_LN);	\
			nslog_log x;					\
			nslog_log("\n");				\
		}							\
	} while(0)

#endif

#endif