/** @file

  Error reporting routines

  @section license License

  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

 */

#include "tscore/ink_platform.h"
#include "tscore/ink_error.h"
#include "tscore/ink_stack_trace.h"

#include <syslog.h>
#include <csignal>

/**
  This routine prints/logs an error message given the printf format
  string in message_format, and the optional arguments.

*/
static void
fatal_va(const char *hdr, const char *fmt, va_list ap)
{
  char msg[1024];
  const size_t len = strlen(hdr);

  strncpy(msg, hdr, sizeof(msg));
  vsnprintf(msg + len, sizeof(msg) - len, fmt, ap);
  msg[sizeof(msg) - 1] = 0;

  fprintf(stderr, "%s\n", msg);
  syslog(LOG_CRIT, "%s", msg);
}

void
ink_fatal_va(const char *fmt, va_list ap)
{
  fatal_va("Fatal: ", fmt, ap);
  _exit(70); // 70 corresponds to EX_SOFTWARE in BSD's sysexits. As good a status as any.
}

void
ink_fatal(const char *message_format, ...)
{
  va_list ap;

  va_start(ap, message_format);
  fatal_va("Fatal: ", message_format, ap);
  va_end(ap);

  _exit(70); // 70 corresponds to EX_SOFTWARE in BSD's sysexits. As good a status as any.
}

void
ink_emergency_va(const char *fmt, va_list ap)
{
  fatal_va("Emergency: ", fmt, ap);
  _exit(UNRECOVERABLE_EXIT);
}

void
ink_emergency(const char *message_format, ...)
{
  va_list ap;

  va_start(ap, message_format);
  ink_emergency_va(message_format, ap);
  // Should never reach here since ink_emergency_va calls exit()
  va_end(ap);

  _exit(UNRECOVERABLE_EXIT);
}

void
ink_abort(const char *message_format, ...)
{
  va_list ap;

  va_start(ap, message_format);
  fatal_va("Fatal: ", message_format, ap);
  va_end(ap);

  abort();
}

/**
  This routine prints/logs a warning message given the printf format
  string in message_format, and the optional arguments.

*/
void
ink_warning(const char *message_format, ...)
{
  va_list ap;
  char extended_format[4096], message[4096];
  va_start(ap, message_format);
  snprintf(extended_format, sizeof(extended_format), "WARNING: %s", message_format);
  extended_format[sizeof(extended_format) - 1] = 0;
  vsnprintf(message, sizeof(message), extended_format, ap);
  message[sizeof(message) - 1] = 0;
  fprintf(stderr, "%s\n", message);
  syslog(LOG_WARNING, "%s", message);
  va_end(ap);
}

/**
  This routine prints/logs a warning message given the printf format
  string in message_format, and the optional arguments.  The current
  errno is also printed.

*/
void
ink_pwarning(const char *message_format, ...)
{
  va_list ap;
  char extended_format[4096], message[4096];
  char *errno_string;

  va_start(ap, message_format);
  errno_string = strerror(errno);
  snprintf(extended_format, sizeof(extended_format), "WARNING: %s <last errno = %d (%s)>", message_format, errno,
           (errno_string == nullptr ? "unknown" : errno_string));
  extended_format[sizeof(extended_format) - 1] = 0;
  vsnprintf(message, sizeof(message), extended_format, ap);
  message[sizeof(message) - 1] = 0;
  fprintf(stderr, "%s\n", message);
  syslog(LOG_WARNING, "%s", message);
  va_end(ap);
}

/**
  This routine prints/logs a notice message given the printf format
  string in message_format, and the optional arguments.

*/
void
ink_notice(const char *message_format, ...)
{
  va_list ap;
  char extended_format[4096], message[4096];
  va_start(ap, message_format);
  snprintf(extended_format, sizeof(extended_format), "NOTE: %s", message_format);
  extended_format[sizeof(extended_format) - 1] = 0;
  vsnprintf(message, sizeof(message), extended_format, ap);
  message[sizeof(message) - 1] = 0;
  fprintf(stderr, "%s\n", message);
  syslog(LOG_NOTICE, "%s", message);
  va_end(ap);
}

/**
  This routine prints/logs a message given the printf format string in
  message_format, and the optional arguments.

*/
void
ink_eprintf(const char *message_format, ...)
{
  va_list ap;
  char message[4096];
  va_start(ap, message_format);
  vsnprintf(message, sizeof(message), message_format, ap);
  message[sizeof(message) - 1] = 0;
  fprintf(stderr, "ERROR: %s\n", message);
  va_end(ap);
}

/**
  This routine prints/logs a warning message given the printf format
  string in message_format, and the optional arguments.

*/
void
ink_error(const char *message_format, ...)
{
  va_list ap;
  char extended_format[2048], message[4096];
  va_start(ap, message_format);
  snprintf(extended_format, sizeof(extended_format), "ERROR: %s", message_format);
  extended_format[sizeof(extended_format) - 1] = 0;
  vsnprintf(message, sizeof(message), extended_format, ap);
  message[sizeof(message) - 1] = 0;
  fprintf(stderr, "%s\n", message);
  syslog(LOG_ERR, "%s", message);
  va_end(ap);
}