# 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 of the License, 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, see <http://www.gnu.org/licenses/>.
#


#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;
}