/* Implementation of the SYSTEM intrinsic.
   Copyright (C) 2004-2013 Free Software Foundation, Inc.
   Contributed by Tobias Schlüter.

This file is part of the GNU Fortran runtime library (libgfortran).

Libgfortran 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, or (at your option) any later
version.

Libgfortran 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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"
#include <string.h>
#include <stdlib.h>

extern void system_sub (const char *fcmd, GFC_INTEGER_4 * status,
			gfc_charlen_type cmd_len);
iexport_proto(system_sub);

void
system_sub (const char *fcmd, GFC_INTEGER_4 *status, gfc_charlen_type cmd_len)
{
  char cmd[cmd_len + 1];
  int stat;

  /* Flush all I/O units before executing the command.  */
  flush_all_units();

  memcpy (cmd, fcmd, cmd_len);
  cmd[cmd_len] = '\0';

  stat = system (cmd);
  if (status)
    *status = stat;
}
iexport(system_sub);

extern GFC_INTEGER_4 PREFIX(system) (const char *, gfc_charlen_type);
export_proto_np(PREFIX(system));

GFC_INTEGER_4
PREFIX(system) (const char *fcmd, gfc_charlen_type cmd_len)
{
  GFC_INTEGER_4 stat;
  system_sub (fcmd, &stat, cmd_len);
  return stat;
}