/*
    slog.C -- logging
    Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
 
    This file is part of GVPE.

    GVPE 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; either version 3 of the License, or (at your
    option) any later version.
   
    This program 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/>.
   
    Additional permission under GNU GPL version 3 section 7
   
    If you modify this Program, or any covered work, by linking or
    combining it with the OpenSSL project's OpenSSL library (or a modified
    version of that library), containing parts covered by the terms of the
    OpenSSL or SSLeay licenses, the licensors of this Program grant you
    additional permission to convey the resulting work.  Corresponding
    Source for a non-source form of such a combination shall include the
    source code for the parts of OpenSSL used as well as that of the
    covered work.
*/

#include <cstdarg>
#include <cstdio>
#include <cstring>
#include <cstdlib>

#include <unistd.h>
#include <syslog.h>

#include "slog.h"

loglevel log_level = L_INFO;
const char *log_identity = "";
static int logto = LOGTO_STDERR;

loglevel
string_to_loglevel (const char *s)
{
  if (!strcmp (s, "noise"))    return L_NOISE;
  if (!strcmp (s, "trace"))    return L_TRACE;
  if (!strcmp (s, "debug"))    return L_DEBUG;
  if (!strcmp (s, "info"))     return L_INFO;
  if (!strcmp (s, "notice"))   return L_NOTICE;
  if (!strcmp (s, "warn"))     return L_WARN;
  if (!strcmp (s, "error"))    return L_ERR;
  if (!strcmp (s, "critical")) return L_CRIT;

  return L_NONE;
}

void
log_to (int mask)
{
  if (logto & LOGTO_SYSLOG)
    closelog ();

  logto = mask;

  if (logto & LOGTO_SYSLOG)
    openlog (log_identity, LOG_CONS | LOG_PID, LOG_DAEMON);
}

void
slog_ (const loglevel l, const char *m, ...)
{
  if (l >= log_level)
    {
      va_list ap;
      va_start (ap, m);
      char *msg = new char [2048];

      vsnprintf (msg, 2048, m, ap);

      if (logto & LOGTO_SYSLOG)
        {
          int lvl = l == L_TRACE  ? LOG_DEBUG
                  : l == L_DEBUG  ? LOG_DEBUG
                  : l == L_INFO   ? LOG_INFO
                  : l == L_NOTICE ? LOG_NOTICE
                  : l == L_ERR    ? LOG_ERR
                  : l == L_CRIT   ? LOG_CRIT
                  :                 LOG_ERR;

          syslog (lvl, "%s", msg);
        }

      if (logto & LOGTO_STDERR)
        {
          write (2, msg, strlen (msg));
          write (2, "\n", 1);
        }

      delete [] msg;
    }
}

void
fatal (const char *m)
{
  slog (L_CRIT, m);
  exit (EXIT_FAILURE);
}

void
require_failed (const char *file, int line, const char *info)
{
  slog (L_CRIT, "FATAL: This program encountered a SHOULD NOT HAPPEN condition and will exit:");
  slog (L_CRIT, "FATAL+ %s:%d '%s' is false", file, line, info);
  slog (L_CRIT, "FATAL+ This might indicates a bug in this program, a bug in your libraries,");
  slog (L_CRIT, "FATAL+ your system setup or operating system. Or it might indicate a very");
  slog (L_CRIT, "FATAL+ unusual, unanticipated operating condition, library version mismatch");
  slog (L_CRIT, "FATAL+ or similar problem. If it's not obvious to you what was causing it,");
  slog (L_CRIT, "FATAL+ then please report this to the program author(s).");
  exit (126);
}