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/* $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
#include "misc.h"
#endif
#include <sys/types.h>
#include <sys/tree.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <sys/_time.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include "event.h"

#include "log.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);

static int
event_vsnprintf(char *str, size_t size, const char *format, va_list args)
{
int r;
if (size == 0)
return -1;
#ifdef WIN32
r = _vsnprintf(str, size, format, args);
#else
r = vsnprintf(str, size, format, args);
#endif
str[size-1] = '\0';
if (r < 0 || ((size_t)r) >= size) {
/* different platforms behave differently on overflow;
* handle both kinds. */
return -1;
}
return r;
}

static int
event_snprintf(char *str, size_t size, const char *format, ...)
{
    va_list ap;
    int r;
    va_start(ap, format);
    r = event_vsnprintf(str, size, format, ap);
    va_end(ap);
    return r;
}

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)
event_vsnprintf(buf, sizeof(buf), fmt, ap);
else
buf[0] = '\0';

if (log_errno >= 0) {
len = strlen(buf);
if (len < sizeof(buf) - 3) {
event_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);
}
}
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