/* concat4.c: concatenate four strings.

Copyright (C) 1992, 2011 Free Software Foundation, Inc.

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, 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "config.h"

string
concat4 P4C(const_string, s1, const_string, s2, const_string, s3, 
	    const_string, s4)
{
  string answer = NULL; 
  
  assert (s1 != NULL);
  assert (s2 != NULL);
  assert (s3 != NULL);
  assert (s4 != NULL);
  
  if (s1 != NULL && s2 != NULL && s3 != NULL && s4 != NULL)
    {
      answer = (string) xmalloc (strlen (s1) + strlen (s2) 
			         + strlen (s3) + strlen (s4) + 1); 
      strcpy (answer, s1);
      strcat (answer, s2);
      strcat (answer, s3);
      strcat (answer, s4);
    }

  return answer;
}