* Based on err.c, which was adapted from OpenBSD libc *err* *warn* code.

/* $NetBSD: log.c,v 1.6 2024/08/18 20:47:21 christos Exp $ */

/* $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) 2005-2012 Niels Provos and Nick Mathewson
*
* Copyright (c) 2000 Dug Song <[email protected]>
*
* 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.
*/

#include "event2/event-config.h"
#include "evconfig-private.h"

#ifdef _WIN32
#include <winsock2.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN
#endif
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include "event2/event.h"
#include "event2/util.h"

#include "log-internal.h"

static void event_log(int severity, const char *msg);
static void event_exit(int errcode) EV_NORETURN;

static event_fatal_cb fatal_fn = NULL;

#ifdef EVENT_DEBUG_LOGGING_ENABLED
#ifdef USE_DEBUG
#define DEFAULT_MASK EVENT_DBG_ALL
#else
#define DEFAULT_MASK 0
#endif

EVENT2_EXPORT_SYMBOL ev_uint32_t event_debug_logging_mask_ = DEFAULT_MASK;
#endif /* EVENT_DEBUG_LOGGING_ENABLED */

void
event_enable_debug_logging(ev_uint32_t which)
{
#ifdef EVENT_DEBUG_LOGGING_ENABLED
event_debug_logging_mask_ = which;
#endif
}

void
event_set_fatal_callback(event_fatal_cb cb)
{
fatal_fn = cb;
}

static void
event_exit(int errcode)
{
if (fatal_fn) {
fatal_fn(errcode);
exit(errcode); /* should never be reached */
} else if (errcode == EVENT_ERR_ABORT_)
abort();
else
exit(errcode);
}

void
event_err(int eval, const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
event_logv_(EVENT_LOG_ERR, strerror(errno), fmt, ap);
va_end(ap);
event_exit(eval);
}

void
event_warn(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
event_logv_(EVENT_LOG_WARN, strerror(errno), fmt, ap);
va_end(ap);
}

void
event_sock_err(int eval, evutil_socket_t sock, const char *fmt, ...)
{
va_list ap;
int err = evutil_socket_geterror(sock);

va_start(ap, fmt);
event_logv_(EVENT_LOG_ERR, evutil_socket_error_to_string(err), fmt, ap);
va_end(ap);
event_exit(eval);
}

void
event_sock_warn(evutil_socket_t sock, const char *fmt, ...)
{
va_list ap;
int err = evutil_socket_geterror(sock);

va_start(ap, fmt);
event_logv_(EVENT_LOG_WARN, evutil_socket_error_to_string(err), fmt, ap);
va_end(ap);
}

void
event_errx(int eval, const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
event_logv_(EVENT_LOG_ERR, NULL, fmt, ap);
va_end(ap);
event_exit(eval);
}

void
event_warnx(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
event_logv_(EVENT_LOG_WARN, NULL, fmt, ap);
va_end(ap);
}

void
event_msgx(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
event_logv_(EVENT_LOG_MSG, NULL, fmt, ap);
va_end(ap);
}

void
event_debugx_(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
event_logv_(EVENT_LOG_DEBUG, NULL, fmt, ap);
va_end(ap);
}

void
event_logv_(int severity, const char *errstr, const char *fmt, va_list ap)
{
char buf[1024];
size_t len;

if (severity == EVENT_LOG_DEBUG && !event_debug_get_logging_mask_())
return;

if (fmt != NULL)
evutil_vsnprintf(buf, sizeof(buf), fmt, ap);
else
buf[0] = '\0';

if (errstr) {
len = strlen(buf);
if (len < sizeof(buf) - 3) {
evutil_snprintf(buf + len, sizeof(buf) - len, ": %s", errstr);
}
}

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);
}
}