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/* Implementation of the EXECUTE_COMMAND_LINE intrinsic.
   Copyright (C) 2009, 2011 Free Software Foundation, Inc.
   Contributed by François-Xavier Coudert.
 
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 <stdbool.h>
#include <stdlib.h>
 
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef  HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
 
 
enum { EXEC_SYNCHRONOUS = -2, EXEC_NOERROR = 0, EXEC_SYSTEMFAILED,
       EXEC_CHILDFAILED };
static const char *cmdmsg_values[] =
  { "",
    "Termination status of the command-language interpreter cannot be obtained",
    "Execution of child process impossible" };
 
 
 
static void
set_cmdstat (int *cmdstat, int value)
{
  if (cmdstat)
    *cmdstat = value;
  else if (value > EXEC_NOERROR)
    runtime_error ("Could not execute command line");
}
 
 
static void
execute_command_line (const char *command, bool wait, int *exitstat,
		      int *cmdstat, char *cmdmsg,
		      gfc_charlen_type command_len,
		      gfc_charlen_type cmdmsg_len)
{
  /* Transform the Fortran string to a C string.  */
  char cmd[command_len + 1];
  memcpy (cmd, command, command_len);
  cmd[command_len] = '\0';
 
  /* Flush all I/O units before executing the command.  */
  flush_all_units();
 
#if defined(HAVE_FORK)
  if (!wait)
    {
      /* Asynchronous execution.  */
      pid_t pid;
 
      set_cmdstat (cmdstat, EXEC_NOERROR);
 
      if ((pid = fork()) < 0)
	set_cmdstat (cmdstat, EXEC_CHILDFAILED);
      else if (pid == 0)
	{
	  /* Child process.  */
	  int res = system (cmd);
	  _exit (WIFEXITED(res) ? WEXITSTATUS(res) : res);
	}
    }
  else
#endif
    {
      /* Synchronous execution.  */
      int res = system (cmd);
 
      if (res == -1)
	set_cmdstat (cmdstat, EXEC_SYSTEMFAILED);
      else if (!wait)
	set_cmdstat (cmdstat, EXEC_SYNCHRONOUS);
      else
	set_cmdstat (cmdstat, EXEC_NOERROR);
 
      if (res != -1)
	{
#if defined(WEXITSTATUS) && defined(WIFEXITED)
	  *exitstat = WIFEXITED(res) ? WEXITSTATUS(res) : res;
#else
	  *exitstat = res;
#endif
	}
    }
 
  /* Now copy back to the Fortran string if needed.  */
  if (cmdstat && *cmdstat > EXEC_NOERROR)
    {
      if (cmdmsg)
	fstrcpy (cmdmsg, cmdmsg_len, cmdmsg_values[*cmdstat],
		strlen (cmdmsg_values[*cmdstat]));
      else
	runtime_error ("Failure in EXECUTE_COMMAND_LINE: %s",
		       cmdmsg_values[*cmdstat]);
    }
}
 
 
extern void
execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait,
			 GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat,
			 char *cmdmsg, gfc_charlen_type command_len,
			 gfc_charlen_type cmdmsg_len);
export_proto(execute_command_line_i4);
 
void
execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait,
			 GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat,
			 char *cmdmsg, gfc_charlen_type command_len,
			 gfc_charlen_type cmdmsg_len)
{
  bool w = wait ? *wait : true;
  int estat, estat_initial, cstat;
 
  if (exitstat)
    estat_initial = estat = *exitstat;
 
  execute_command_line (command, w, &estat, cmdstat ? &cstat : NULL,
			cmdmsg, command_len, cmdmsg_len);
 
  if (exitstat && estat != estat_initial)
    *exitstat = estat;
  if (cmdstat)
    *cmdstat = cstat;
}
 
 
extern void
execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait,
			 GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat,
			 char *cmdmsg, gfc_charlen_type command_len,
			 gfc_charlen_type cmdmsg_len);
export_proto(execute_command_line_i8);
 
void
execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait,
			 GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat,
			 char *cmdmsg, gfc_charlen_type command_len,
			 gfc_charlen_type cmdmsg_len)
{
  bool w = wait ? *wait : true;
  int estat, estat_initial, cstat;
 
  if (exitstat)
    estat_initial = estat = *exitstat;
 
  execute_command_line (command, w, &estat, cmdstat ? &cstat : NULL,
			cmdmsg, command_len, cmdmsg_len);
 
  if (exitstat && estat != estat_initial)
    *exitstat = estat;
  if (cmdstat)
    *cmdstat = cstat;
}