/* appendstr.c -- append to a dynamically allocated string

   Copyright (C) 1994 Markus Armbruster

   This program is free software; you can redistribute it and/or

   modify it under the terms of the GNU General Library Public License

   as published by the Free Software Foundation; either version 2, 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; see the file COPYING.LIB.  If not, write

   to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA

   02139, USA.  */

#ifdef HAVE_CONFIG_H

#  include "config.h"

#endif /* HAVE_CONFIG_H */

#include <string.h>

#include <stdarg.h>

#include "xalloc.h"

#include "pipeline-private.h"

/* append strings to first argument, which is realloced to the correct size 

   first arg may be NULL */

char *appendstr (char *str, ...)

{

      va_list ap;

      int len, newlen;

      char *next, *end;

      len = str ? strlen (str) : 0;

      va_start (ap, str);

      newlen = len + 1;

      while ((next = va_arg (ap, char *)))

              newlen += strlen (next);

      va_end (ap);

      str = xrealloc (str, newlen);

      end = str + len;

      va_start (ap, str);

      while ((next = va_arg (ap, char *))) {

              strcpy (end, next);

              end += strlen (next);

      }

      va_end (ap);

      return str;

}