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/* Implementation of the PAUSE statement.

   Copyright 2002, 2005, 2007, 2009, 2010, 2011 Free Software Foundation, Inc.

   Contributed by Paul Brook <paul@nowt.org>

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 of the License, 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 <unistd.h>

static void

do_pause (void)

{

  char buff[4];

  estr_write ("To resume execution, type go.  "

              "Other input will terminate the job.\n");

  fgets(buff, 4, stdin);

  if (strncmp(buff, "go\n", 3) != 0)

    stop_string ('\0', 0);

  estr_write ("RESUMED\n");

}

/* A numeric PAUSE statement.  */

extern void pause_numeric (GFC_INTEGER_4);

export_proto(pause_numeric);

void

pause_numeric (GFC_INTEGER_4 code)

{

  st_printf ("PAUSE %d\n", (int) code);

  do_pause ();

}

/* A character string or blank PAUSE statement.  */

extern void pause_string (char *string, GFC_INTEGER_4 len);

export_proto(pause_string);

void

pause_string (char *string, GFC_INTEGER_4 len)

{

  estr_write ("PAUSE ");

  ssize_t w = write (STDERR_FILENO, string, len);

  (void) sizeof (w); /* Avoid compiler warning about not using write

                        return val.  */

  estr_write ("\n");

  do_pause ();

}