text: /*	$OpenBSD: err.c,v 1.2 2002/06/25 15:50:15 mickey Exp $	*/
  
  /*
   * log.c
   *
   * Based on err.c, which was adapted from OpenBSD libc *err* *warn* code.
   *
   * Copyright (c) 2005 Nick Mathewson <nickm@freehaven.net>
   *
   * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
   *
   * Copyright (c) 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #ifdef WIN32
  #define WIN32_LEAN_AND_MEAN
  #include <windows.h>
  #undef WIN32_LEAN_AND_MEAN
  #endif
  #include <sys/types.h>
  #ifdef HAVE_SYS_TIME_H
  #include <sys/time.h>
  #else
  #include <sys/_libevent_time.h>
  #endif
  #include <stdio.h>
  #include <stdlib.h>
  #include <stdarg.h>
  #include <string.h>
  #include <errno.h>
  #include "event.h"
  
  #include "log.h"
  #include "evutil.h"
  
  static void _warn_helper(int severity, int log_errno, const char *fmt,
                           va_list ap);
  static void event_log(int severity, const char *msg);
  
  void
  event_err(int eval, const char *fmt, ...)
  {
  	va_list ap;
  	
  	va_start(ap, fmt);
  	_warn_helper(_EVENT_LOG_ERR, errno, fmt, ap);
  	va_end(ap);
  	exit(eval);
  }
  
  void
  event_warn(const char *fmt, ...)
  {
  	va_list ap;
  	
  	va_start(ap, fmt);
  	_warn_helper(_EVENT_LOG_WARN, errno, fmt, ap);
  	va_end(ap);
  }
  
  void
  event_errx(int eval, const char *fmt, ...)
  {
  	va_list ap;
  	
  	va_start(ap, fmt);
  	_warn_helper(_EVENT_LOG_ERR, -1, fmt, ap);
  	va_end(ap);
  	exit(eval);
  }
  
  void
  event_warnx(const char *fmt, ...)
  {
  	va_list ap;
  	
  	va_start(ap, fmt);
  	_warn_helper(_EVENT_LOG_WARN, -1, fmt, ap);
  	va_end(ap);
  }
  
  void
  event_msgx(const char *fmt, ...)
  {
  	va_list ap;
  	
  	va_start(ap, fmt);
  	_warn_helper(_EVENT_LOG_MSG, -1, fmt, ap);
  	va_end(ap);
  }
  
  void
  _event_debugx(const char *fmt, ...)
  {
  	va_list ap;
  	
  	va_start(ap, fmt);
  	_warn_helper(_EVENT_LOG_DEBUG, -1, fmt, ap);
  	va_end(ap);
  }
  
  static void
  _warn_helper(int severity, int log_errno, const char *fmt, va_list ap)
  {
  	char buf[1024];
  	size_t len;
  
  	if (fmt != NULL)
  		evutil_vsnprintf(buf, sizeof(buf), fmt, ap);
  	else
  		buf[0] = '\0';
  
  	if (log_errno >= 0) {
  		len = strlen(buf);
  		if (len < sizeof(buf) - 3) {
  			evutil_snprintf(buf + len, sizeof(buf) - len, ": %s",
  			    strerror(log_errno));
  		}
  	}
  
  	event_log(severity, buf);
  }
  
  static event_log_cb log_fn = NULL;
  
  void
  event_set_log_callback(event_log_cb cb)
  {
  	log_fn = cb;
  }
  
  static void
  event_log(int severity, const char *msg)
  {
  	if (log_fn)
  		log_fn(severity, msg);
  	else {
  		const char *severity_str;
  		switch (severity) {
  		case _EVENT_LOG_DEBUG:
  			severity_str = "debug";
  			break;
  		case _EVENT_LOG_MSG:
  			severity_str = "msg";
  			break;
  		case _EVENT_LOG_WARN:
  			severity_str = "warn";
  			break;
  		case _EVENT_LOG_ERR:
  			severity_str = "err";
  			break;
  		default:
  			severity_str = "???";
  			break;
  		}
  		(void)fprintf(stderr, "[%s] %s\n", severity_str, msg);
  	}
  }
  