/* identify -- Probe system and report characteristica.
  Copyright (C) 2013-2023 Free Software Foundation, Inc.

  This file is part of GNU Inetutils.

  GNU Inetutils 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.

  GNU Inetutils 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/'. */

/* Written by Mats Erik Andersson.  */

/* Collect information about this system and report it.
 * Some identified characteristica of relevance to GNU Inetutils
 * are displayed for use in bug reporting and resolution.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

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

#include <sys/param.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>

#ifdef HAVE_TERMIOS_H
# include <errno.h>
# if HAVE_FCNTL_H
#  include <fcntl.h>
# endif
# include <termios.h>

# include <pty.h>
#endif /* HAVE_TERMIOS_H */

#define tell_macro(a,b)	\
  printf ("%s: %s\n", (b) ? "Available macro" : "Not defined", (a));

#ifdef HAVE_TCGETATTR
# define test_flag(a, b, name)	\
  if (tc.a & b) printf (" %s", name);

void
do_termcap (void)
{
  int pty, tty;
  struct termios tc;

  pty = openpty (&pty, &tty, NULL, NULL, NULL);
  if (pty < 0)
    {
      fprintf (stderr, "openpt: errno = %d, %s\n", errno, strerror (errno));
      return;
    }

  if (tcgetattr (tty, &tc) < 0)
    {
      fprintf (stderr, "tcgetattr; errno = %d, %s\n",
	       errno, strerror (errno));
      return;
    }

  printf ("_POSIX_VDISABLE = 0x%02x\n\n", _POSIX_VDISABLE);

  /* Report the most interesting observations.  */
  puts ("Default terminal settings (octal and hexadecimal):");
  printf ("iflag = 0%06o = 0x%04x,  oflag = 0%06o = 0x%04x\n",
	  tc.c_iflag, tc.c_iflag, tc.c_oflag, tc.c_oflag);
  printf ("cflag = 0%06o = 0x%04x,  lflag = 0%06o = 0x%04x\n",
	  tc.c_cflag, tc.c_cflag, tc.c_lflag, tc.c_lflag);

  puts ("\nThe most relevant properties being set:");

  printf ("iflag:");
  test_flag (c_iflag, IXOFF, "IXOFF");
  test_flag (c_iflag, IXON, "IXON");
  test_flag (c_iflag, IXANY, "IXANY");
  test_flag (c_iflag, BRKINT, "BRKINT");
  test_flag (c_iflag, ISTRIP, "ISTRIP");
  test_flag (c_iflag, IGNCR, "IGNCR");
  test_flag (c_iflag, INLCR, "INLCR");
  test_flag (c_iflag, ICRNL, "ICRNL");
  puts ("");

  printf ("oflag:");
  test_flag (c_oflag, OPOST, "OPOST");
  test_flag (c_oflag, OCRNL, "OCRNL");
  test_flag (c_oflag, ONLCR, "ONLCR");
  test_flag (c_oflag, ONLRET, "ONLRET");

# ifdef TABDLY
  printf (" TAB");
  switch (tc.c_oflag & TABDLY)
    {
    case TAB3:
      putchar ('3');
      break;
#  ifdef TAB2
    case TAB2:
      putchar ('2');
      break;
#  endif
      /* TAB2 */
#  ifdef TAB1
    case TAB1:
      putchar ('1');
      break;
#  endif
      /* TAB1 */
    case TAB0:
      putchar ('0');
      break;
    }
# elif defined OXTABS		/* !TABDLY */
  test_flag (c_oflag, OXTABS, "OXTABS");
# endif/* OXTABS */

  puts ("");

  printf ("cflag:");
  switch (tc.c_cflag & CSIZE)
    {
    case CS8:
      printf (" CS8");
      break;
    case CS7:
      printf (" CS7");
    }
  puts ("");

  printf ("lflag:");
  test_flag (c_lflag, ICANON, "ICANON");
  test_flag (c_lflag, ISIG, "TRAPSIG");
  test_flag (c_lflag, IEXTEN, "IEXTEN");
  test_flag (c_lflag, ECHO, "ECHO");
  test_flag (c_lflag, ECHOE, "ECHOE");
  test_flag (c_lflag, ECHOK, "ECHOK");
  test_flag (c_lflag, ECHOKE, "ECHOKE");
  test_flag (c_lflag, ECHONL, "ECHONL");
  test_flag (c_lflag, ECHOCTL, "ECHOCTL");
  puts ("");

  return;
}

# undef test_flag
#endif /* HAVE_TCGETATTR */


int
main (void)
{
  int a, ux;
  struct utsname uts;
  struct sockaddr_un su;

  if (uname (&uts) < 0)
    {
      fprintf (stderr, "Not able to identify running system.\n");
      exit (EXIT_FAILURE);
    }

  /* Identify the hardware.  */
  printf ("Running system: %s, %s\n", uts.sysname, uts.machine);
  printf (" Variant: %s\n", uts.release);
  printf (" Variant: %s\n", uts.version);
  puts ("");

  /*
   * Report on macros that determine alternate code.
   * These depend on toolchains and hardware.
   */
  ux = 0;
#ifdef unix
  ux = 1;
#endif
  tell_macro ("unix", ux);

  ux = 0;
#ifdef __unix
  ux = 1;
#endif
  tell_macro ("__unix", ux);

  ux = 0;
#ifdef __unix__
  ux = 1;
#endif
  tell_macro ("__unix__", ux);

  ux = 0;
#ifdef __sun
  ux = 1;
#endif
  tell_macro ("__sun", ux);

  ux = 0;
#ifdef __sun__
  ux = 1;
#endif
  tell_macro ("__sun__", ux);

  a = 0;
#ifdef TN3270
  a = 1;
#endif
  tell_macro ("TN3270", a);

  /*
   * Implementation specific charateristica.
   */
  puts ("");

  a = 0;
#ifdef BSD
  a = 1;
#endif
  tell_macro ("BSD", a);

  printf ("Size of 'struct sockaddr_un.sun_path': %zu\n",
	  sizeof (su.sun_path));

#if HAVE_TCGETATTR
  puts ("");
  do_termcap ();
#endif

  return 0;
}
