/* Copyright (C) 2008  Emmanuel Varoquaux

   This file is part of XOS.

   This program 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/>. */

#include <error.h>

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>

void (*error_print_progname)() __attribute__ ((weak, visibility ("default"))) = NULL;

void __attribute__ ((weak, visibility ("default"))) error(int status, int errnum, const char *format, ...)
{
  va_list ap;

  fflush(stdout);
  if (error_print_progname)
    error_print_progname();
  else
    fprintf(stderr, "%s", program_invocation_name);
  if (format) {
    fputs(": ", stderr);
    va_start(ap, format);
    vfprintf(stderr, format, ap);
    va_end(ap);
  }
  if (errnum)
    fprintf(stderr, ": %s", strerror(errnum));
  fputc('\n', stderr);
  fflush(stderr);
  if (status)
    exit(status);
}